EP2993014A1 - Method for controlling a wall saw system when creating a separating cut - Google Patents

Abstract

A method of controlling a wall sawing system (10) to create a severing cut in a workpiece (24) between a first and second endpoint. The wall saw system (10) comprises a wall saw (12) with a saw head (14), a pivotable saw arm (17), a saw blade (16) and a blade guard (21). The separation cut is performed in several main sections, with the parameters of the main sections (main section angles) being set before starting in a main cutting sequence. The movement of the saw head (14) is controlled at the end points so that after the pivoting movement of the saw arm (17) coincides, the end point facing boundary of the wall saw (12) with the end point. The boundary of the wall saw (12) is formed at a free end point by an upper exit point of the saw blade (16) and at an obstacle by the saw blade edge of the saw blade (16) when the processing without blade guard (21), or by the blade guard edge of Blade guard (21) when working with blade guard (21).

Description

Technical area

The present invention relates to a method for controlling a wall sawing system when creating a separating cut according to the preamble of claim 1.

State of the art

Out EP 1 693 173 B1 For example, a method for controlling a wall sawing system when creating a parting cut in a workpiece between a first endpoint and a second endpoint is known. The wall saw system comprises a guide rail and a wall saw with a saw head, a motor feed unit which moves the saw head parallel to a feed direction along the guide rail and at least one saw blade mounted on a saw arm of the saw head and driven by a drive motor about an axis of rotation. The saw arm is designed to be pivotable about a pivot axis by means of a swivel motor. By a pivoting movement of the saw arm about the pivot axis, the penetration depth of the saw blade is changed in the workpiece. The motorized feed unit comprises a guide carriage and a feed motor, wherein the saw head is mounted on the guide carriage and moved over the feed motor along the guide rail. For monitoring the wall sawing system, a sensor device with a swivel angle sensor and a displacement sensor is provided. The swivel angle sensor measures the instantaneous swivel angle of the saw arm and the travel sensor measures the current position of the saw head on the guide rail. The measured values for the current swivel angle of the saw arm and the current position of the saw head are regularly transmitted to a control unit of the wall saw.

The known method for controlling a wall sawing system is divided into a preparation part and a processing of the separating cut controlled by the control unit. In the preparation part, the operator sets at least the saw blade diameter of the saw blade, the positions of the first and second end points in the feed direction and the final depth of the separating cut; other parameters can be the material of the machined Workpiece and the dimensions of embedded reinforcing iron. From the parameters entered, the separating cut control unit determines a suitable main cutting sequence of main cuts, the main cutting sequence comprising at least a first main section having a first main cutting angle of the saw arm and a first diameter of the saw blade used, and a following second main section having a second main cutting angle of the saw arm and a first Diameter of the saw blade used.

After the start of the controlled processing, the saw head is positioned in a starting position. In the starting position, the saw arm is pivoted in a negative direction of rotation about the pivot axis and arranged under the negative first main cutting angle. The saw head is moved in a positive feed direction along the guide rail in the direction of the second end point, wherein the saw arm during machining is in a pulling arrangement. Before reaching the second end point of the saw head is stopped and in a, opposite to the positive feed direction, negative feed direction sufficiently far back. The saw arm is pivoted in a, opposite to the negative direction of rotation, positive direction of rotation from the negative first main section angle in a positive main section angle of the saw arm.

In a first variant of the saw arm is pivoted from the negative first main section angle in the positive first main section angle and the saw head is moved in the positive feed direction to the second end point, wherein the saw arm is in an abutting arrangement. Upon reaching the second end point, the feed direction is reversed and the saw head is moved in the negative feed direction to the first end point, wherein the saw arm is in a pulling arrangement. Before the first end point of the saw head is stopped and sufficiently far in the positive feed direction. The saw arm is pivoted from the positive first main cutting angle to the negative first main cutting angle, and the saw head is moved in the negative feed direction toward the first end point with the saw arm in an abutting arrangement.

In a second variant, the saw arm is pivoted from the negative first main cutting angle into the positive second main cutting angle, and the saw head is moved in the positive feed direction to the second end point, wherein the saw arm is in an abutting arrangement. Upon reaching the second end point, the feed direction is reversed and the saw head is moved in the negative feed direction to the first end point, wherein the saw arm is in a pulling arrangement. Before the first end point, the saw head is stopped and in the positive feed direction sufficiently far back. The saw arm is pivoted from the negative second main cutting angle to a positive main cutting angle and the saw head is moved in the negative feed direction to the first end point, wherein the saw arm is in a butting arrangement. When the second main section represents the last main section, the saw arm is pivoted to the positive second main section angle. When a third main section is performed with a third main section angle, the saw arm is swung from the negative second main section angle to the positive third main section angle of the third main section. The process steps are repeated until the final depth of the separation cut is reached.

The known method for controlling a wall sawing system has the disadvantage that the saw head is reset before machining in abutting arrangement of the saw arm. When resetting done only a positioning of the saw head and no machining of the workpiece. The time required for the positioning prolongs the non-productive time especially for short cuts.

Presentation of the invention

The object of the present invention is to develop a method for controlling a wall sawing system with a high machining quality, in which the non-productive times for positioning the saw head and the saw arm are reduced.

This object is achieved according to the invention in the aforementioned method for controlling a wall saw system by the features of the independent claim. Advantageous developments are specified in the dependent claims.

According to the invention, the saw head is moved in the controlled processing so that after the pivoting movement of the saw arm in the new pivot angle, the second end point facing second boundary of the wall saw coincides with the second end point, wherein the second boundary of the wall saw by a second end point of the used saw blade facing the second end point is formed on an upper side of the workpiece, when the second end point represents a free end point without hindrance, by a, second end point facing, second saw blade edge of the saw blade used when the second end point is an obstacle and the processing is performed without blade protection, and by a, the second end point facing, the second blade protection edge of the blade protection used when the second endpoint is an obstacle and the processing is done with blade guard.

The method according to the invention for controlling a wall sawing system has the advantage that it is possible to machine it with a saw arm arranged exclusively by pulling and non-productive times for positioning the saw head are reduced by a corresponding position control of the saw head. For the control of the process in the transition from the first main section to the second main section, the second boundary of the wall saw is used. The second boundary is formed at a free end point without obstruction by the second upper exit point of the saw blade used and at an obstacle by the second saw blade edge (without blade guard) and the second blade guard edge (with blade guard).

Preferably, prior to starting the machining controlled by the control unit, a saw arm length of the saw arm, which is defined as the distance between the swivel axis of the saw arm and the axis of rotation of the saw blade, and a distance between the swivel axis and the top of the work piece are set. For a controlled processing of a separating cut, the control unit must be aware of various parameters. These include the Sägearmlänge, which represents a fixed device-specific size of the wall saw, and the vertical distance between the pivot axis and the surface of the workpiece, which also depends on the geometry of the wall saw and the geometry of the guide rail used.

Particularly preferably, before the start of the controlled processing, a first width is additionally defined for a blade guard used in the first main section, and a second width for a blade guard used in the second main section, wherein the first and second widths each consist of a first distance of the rotation axis are assembled to the first blade guard edge and a second distance of the rotation axis to the second blade protection edge. If an end point is an obstacle, the position control of the saw head on the, the obstacle facing, blade protection edge of the used sheet protection takes place. In the case of an asymmetric blade guard, the first and second distances between the axis of rotation and the blade guard edges are different, whereas in the case of a symmetrical blade guard the first and second blade guard edges coincide with the half width of the blade guard.

The control method according to the invention is characterized in that the second boundary of the wall saw coincides with the second end point after the pivoting movement of the saw arm into the new pivot angle. In a first development, the new pivot angle corresponds to the first main section angle of the first main section and, in a second development, to the second main section angle of the second main section.

In the first development, the saw arm is pivoted in the positive direction of rotation from the negative first main section angle to the positive first main section angle and after the pivoting movement into the positive first main cutting angle, the second upper exit point of the saw blade used coincides with the second end point when the pivot axis is at a distance from the second end point of √ [h ₁ * (D ₁ -h ₁ )] + δ · sin ( + α _1), wherein h ₁ = h (+ α _1, D ₁₎ = D _1/2 - δ - δ · cos (+ α ₁₎ the depth of penetration of the saw blade used first in the workpiece during the positive first main cutting angle with the diameter denotes the second blade edge of the saw blade used with the second end point coincide, if the pivot axis is at a distance to the second end point of D _1/2 + δ · sin (+ α _1), and the second blade guard edge of the blade guard used with the second endpoint coincides when the pivot axis has a distance to the second end point of B _1b + δ · sin (+ α ₁ ).

In the method according to the invention, the saw arm is arranged exclusively by pulling and the saw arm is pivoted in a position such that, after swiveling, the second boundary of the wall saw coincides with the second end point. By pivoting remains in the region of the pivot axis residual material. The residual material of the first main section is removed in a first variant completely in the first main section and removed in a second variant partially in the first main section.

In the first variant of the saw head is in a, opposite to the positive feed direction, negative feed direction by a path length of at least 2δ · | sin (+ α ₁ ) | method and the saw head then positioned so that the second boundary of the wall saw coincides after the pivotal movement of the saw arm in the positive second main cutting angle with the second end point, wherein the second upper exit point coincides with the second end point, when the pivot axis a distance to the second end point of √ [h ₂ · (D ₂ - h ₂ )] + δ · sin (+ α ₂ ), where h ₂ = h (+ α ₂ , D ₂ ) = D _2/2 -Δ-δ · cos (+ α ₂₎ designates the depth of penetration of the saw blade used in the workpiece during the positive second main cutting angle with the second diameter, the second blade edge of the saw blade used with the second end point coincide, if the pivot axis is spaced from the second end point of D _2/2 + δ · sin (+ α ₂ ), and the second blade guard edge of the blade guard used coincides with the second end point when the pivot axis is a distance from the second end point of B _2b + δ · sin ( + α ₂ ).

The first variant is referred to as complete removal of the residual material. The path length is adjusted so that the residual material not removed by the swiveling of the saw arm is completely detected. After removal of the residual material, the positioning of the saw head for the second main section, wherein at a free end point without obstacle, the second upper exit point is used with obstacle, the second saw blade edge or the second blade guard edge, depending on whether the processing without Leaf protection or with leaf protection. The first variant has the advantage that the residual material is completely removed in the first main section and in the second main section only the depth of cut of the second main section has to be removed. Therefore, the first variant is suitable for less powerful drive motors.

In the second variant, the saw head is moved in the negative feed direction so that the second boundary of the wall saw coincides with the pivoting movement of the saw arm in the positive second main cutting angle with the second end point, wherein the second upper exit point of the saw blade used coincides with the second end point, if the pivot axis is at a distance from the second end point of √ [h ₂ * (D ₂ -h ₂ )] + δ * sin (+ α ₂ ), where h ₂ = h (+ α ₂ , D ₂ ) = D ₂ / 2 - Δ - δ · cos (+ α ₂ ) denotes the penetration depth of the saw blade used in the workpiece at the positive second main cutting angle with the second diameter, the second saw blade edge of the saw blade used coincides with the second end point, if the pivot axis a distance from the second end point of D _2/2 + δ · sin (+ α ₂ ), and the second blade guard edge of the blade guard used coincides with the second end point when the pivot has a distance to the second end point of B _2b + δ · sin (+ α ₂ ).

The second variant is referred to as partial removal of the residual material. The removal of the residual material and the positioning of the saw head for the second main section are summarized. After swiveling the saw arm into the positive first main cutting angle, the saw head is moved until the pivot axis has a defined distance from the second end point E ₂ . The distance depends on whether the end point represents a free end point without an obstacle or, if the end point is an obstacle, whether processing is performed without blade protection or with blade protection. The distance is set so that the second boundary of the wall saw coincides after the pivoting movement in the positive second main cutting angle with the second end point E ₂ . The second variant has the advantage that the removal of the residual material and positioning for the second main section are combined and the additional positioning step is eliminated; On the other hand, a higher cutting depth must be removed in the second main section. Therefore, the second variant is suitable for high-performance wall saws.

In the second development of the saw arm is pivoted in the positive direction of rotation from the negative first main section angle in the positive second main section angle and after the pivoting movement in the positive second main section angle falls the second upper exit point of the saw blade used with the second end point together when the pivot axis a distance to the second endpoint of √ [h ₂ · (D ₂ - h ₂ )] + δ · sin (+ α ₂ ), where h ₂ = h (+ α ₂ , D ₂ ) = D _2/2 -Δ-δ · Cos (+ α ₂ ) the penetration depth of the used saw blade into the workpiece at the positive second main cutting angle with the second diameter designated, the second blade edge of the saw blade used with the second end point coincides comprising if the pivot axis is spaced from the second end point of D _2/2 + δ · sin (+ α _2), and the second blade guard edge of the blade guard used with the second End point coincides when the pivot axis has a distance to the second end point of B _2b + δ · sin (+ α ₂ ).

The second development of the control method completely dispenses with removal of the residual material in the first main section. The distance is adjusted so that the second boundary of the wall saw after the pivoting movement of the saw arm coincides in the positive second main cutting angle with the second end point. This variant without removing the residual material has the lowest non-productive times; however, a powerful blade drive motor is required that can handle the greater cutting depth at the end point.

Particularly preferably, the saw head is moved with the, under the positive second main cutting angle, inclined saw arm in the negative feed direction. Subsequently, the saw head is moved in the controlled by the control unit machining so that a, the first end point facing first boundary of the wall saw after the pivotal movement of the saw arm from the positive second main cutting angle coincides with the first end point, the first limit of the Wall saw is formed by a, the first end point facing, the first upper exit point of the saw blade used at the top of the workpiece, when the first endpoint represents a free end point without obstruction, by a, the first end point facing first saw blade edge of the saw blade used when the first endpoint is an obstacle and the processing is done without blade protection, and by a, the first endpoint facing, the first blade protection edge of the blade protection used when the first endpoint is an obstacle and the processing is done with blade protection.

The method according to the invention is characterized in that the first boundary of the wall saw facing the first end point is also used for the control. After the pivoting movement of the saw arm in the new swing angle, the first boundary of the wall saw coincides with the first end point. In a first development, the new pivot angle corresponds to the negative second main section angle of the second main section and, in a second development, to the negative third main section angle of a following third main section.

In the first development of the saw arm is pivoted in the negative direction of rotation from the positive second main section angle in the negative second main section angle and falls after the pivoting movement in the negative second main section angle the first upper exit point of the saw blade used coincides with the first end point when the pivot axis is spaced from the first end point of √ [h ₂ * (D ₂ -h ₂ )] -δ · sin (-α ₂ ), where h ₂ = h (-α ₂ , D ₂ ) = D _2/2 - Δ - δ · cos (-α ₂ ) denotes the penetration depth of the saw blade used in the workpiece at the negative second main cutting angle with the second diameter, the first saw blade edge of the saw blade used falls together with the first end point, when the pivot axis is at a distance from the first end point of D _2/2 - δ · sin (-α ₂ ), and the first blade guard edge of the blade guard used coincides with the first end point when the pivot axis is spaced apart from the first end point first endpoint of B _2a - δ · sin (-α ₂ ).

In a first embodiment, the second main section represents the last main section of the main cutting sequence. The saw arm is pivoted in the negative rotational direction from the positive second main section angle to the negative second main section angle, and after the pivoting movement into the negative second main section angle the first upper exit point of the saw blade used falls together with the first end point when the pivot axis is at a distance from the first end point of √ [h ₂ * (D ₂ -h ₂ )] -δ · sin (-α ₂ ), where h ₂ = h (-α ₂ , D ₂ ) = D _2/2 - Δ - δ · cos (-α ₂ ) denotes the penetration depth of the saw blade used in the workpiece at the negative second main cutting angle with the second diameter, the first saw blade edge of the saw blade used coincides with the first end point, if the pivot axis is at a distance from the first end point of D _2/2 - δ · sin (-α ₂ ), and the first blade guard edge of the B used lattschutzes coincides with the first end point, when the pivot axis has a distance from the first end point of B _2a - δ · sin (-α ₂ ).

Sin (-α ₂₎ |, the saw head in the positive feeding direction with the inclined under the negative second main cutting angle saw arm to a path length of at least 2δ · is preferable | method. This path length ensures that the residual material of the second major section has been completely removed.

Alternatively, the main cutting sequence comprises a third main cut to be made after the second main cut with a third main cutting angle of the saw arm, a third diameter of the saw blade used and a third width of the blade guard used with a first and second distance to the blade guard edges, the saw arm in the third main cut in FIG a pulling arrangement is arranged and the saw head is moved in the positive feed direction.

In a first variant, the saw head is moved in the negative feed direction so that the first boundary of the wall saw after the pivoting movement of the saw arm in the negative second second cutting angle coincides with the first endpoint, the first boundary being formed by a first upper exit point of the used saw blade at the top of the workpiece, when the first endpoint represents a free endpoint without obstruction, by a the first end blade facing the first saw blade edge of the saw blade used when the first endpoint is an obstacle and the processing is done without blade protection, and by a first endpoint facing, the first blade guard edge of the blade guard used when the first endpoint is an obstacle and the processing done with blade protection.

In order to remove the residual material, the saw head is moved in the positive feed direction with the saw arm inclined below the negative second main cutting angle by a path length of at least 2δ · | sin (-α ₂ ) | method and the saw head is then positioned so that the first boundary of the saw after the pivotal movement of the saw arm in the negative third main cutting angle coincides with the first end point, wherein the first upper exit point of the saw blade used coincides with the first end point when the pivot axis a distance the first end point (e ₁₎ of √ [h ₃ x (D ₃ - h _3)] - δ · sin (-α _3), wherein h ₃ = h (-α ₃ D ₃₎ = D _3/2 - Δ - δ · cos (-α ₃ ) denotes the penetration depth of the saw blade used in the workpiece at the negative third main cutting angle with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis a distance has δ · sin (-α _3), and the first sheet protection edge of the blade guard used with the first end point coincide, if the pivot axis is spaced from the - to the first end point D of _3/2 first end point of B _3a - δ · sin (-α ₃ ).

In a second variant, the saw head is moved in the positive feed direction such that the first boundary of the wall saw coincides with the first end point after the pivoting movement of the saw arm into the negative third main cutting angle, wherein the first upper exit point of the saw blade used coincides with the first end point, if the pivot axis is at a distance from the first end point of √ [h ₃ * (D ₃ -h ₃ )] -δ · sin (-α ₃ ), where h ₃ = h (-α ₃ , D ₃ ) = D ₃ / 2 - Δ - δ · cos (-α ₃ ) denotes the penetration depth of the saw blade used in the workpiece at the negative third main cutting angle with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point, when the pivot axis at a distance from the first end point has δ · sin (-α _3), and the first sheet protection edge of the blade guard used with the first end point coincide, if the pivot axis ei - D _3/2 NEN distance from the first end point of B _3a - δ · sin (-α ₃ ).

In a third variant, the saw arm is pivoted in the negative direction of rotation from the positive second main section angle into the negative third main section angle, and after the pivoting movement into the negative third main section angle, the first upper exit point of the saw blade used coincides with the first end point when the pivot axis is at a distance for the first endpoint of √ [h ₃ x (D ₃ - h _3)] - δ · sin (-α _3), wherein h ₃ = h (-α ₃ D ₃₎ = D _3/2 - Δ - δ · Cos (-α ₃ ) denotes the penetration depth of the saw blade used in the workpiece at the negative third main cutting angle (-α ₃ ) with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point, when the pivot axis spaced from the first end point (e ₁₎ of D _3/2 - δ · sin (-α _3), and the first sheet protection edge of the blade guard used coincides with the first endpoint when the Schwenkachs e has a distance to the first end point of B _3a - δ · sin (-α ₃ ).

The third variant completely dispenses with removal of the residual material in the second main section. The distance is adjusted so that the first boundary of the wall saw after the pivoting movement of the saw arm coincides with the first end point. The variant without removing the residual material has the lowest non-productive times; however, a powerful drive motor is required that can handle the greater depth of cut at the endpoint.

The first and second main cuts are made with a saw blade and a blade guard, or alternatively the first main cut is made with a first blade and a first blade guard, the first blade having a first blade diameter and the first blade guard having a first blade guard width, and the second major section being performed with a second saw blade and a second blade guard, wherein the second saw blade has a second blade diameter and the second blade guard a second blade guard width.

In a preferred variant, the first main section of the main cutting sequence is a precut and the saw head is positioned after the start of the controlled by the control unit processing in a start position, wherein in the start position, the first end point facing the first boundary of the wall saw after the pivoting movement in the negative first main intercept angle coincides with the first endpoint.

In this case, the first upper exit point of the saw blade used coincides with the first end point when the pivot axis is at a distance from the first end point of √ [h ₁ * (D ₁ -h ₁ )] -δ · sin (-α ₁ ), where h ₁ = h (α _1, D ₁₎ = D _1/2 - Δ - δ · cos (-α ₁₎ the depth of penetration of the saw blade used in the workpiece at the first main negative cutting angle designated by the first diameter, the first blade edge of the saw blade used coincides with the first end point, if the pivot axis is spaced from the first end point of D _1/2 - has δ · sin (-α _1), and the first sheet protection edge of the blade guard used coincides with the first end point when the pivot axis is at a distance from the first end point of B _1a - δ · sin (-α ₁ ).

The method according to the invention applies to all major sections in which the main section angle is less than or equal to a critical pivot angle. The critical swing angle is ± 90 ° if the endpoint is an obstacle and the critical swing angle is 180 ° - arccos [Δ / (δ + D / 2)] if the endpoint is a free endpoint with no obstruction.

embodiments

Embodiments of the invention are described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematic and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, the drawings and the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article that would be limited in comparison with the subject matter claimed in the claims. For given design ranges, values lying within the specified limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

FIG. 1

ein Wandsägesystem mit einer Führungsschiene und einer Wandsäge;

FIGN. 2A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten freien Endpunkt ohne Hindernis;

FIGN. 3A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten Hindernis mit einem Sägeblatt, das nicht von einem Blattschutz umgeben ist;

FIGN. 4A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten Hindernis mit einem Sägeblatt, das von einem Blattschutz umgeben ist;

FIGN. 5A-N

das Wandsägesystem der FIG. 1 bei Erstellen eines Trennschnittes zwischen einem ersten freien Endpunkt ohne Hindernis und einem zweiten freien Endpunkt ohne Hindernis mit Hilfe des erfindungsgemässen Verfahrens; und

FIGN. 6A-H

das Wandsägesystem der FIG. 1 bei Erstellen eines weiteren Trennschnittes zwischen einem Hindernis und einem freien Endpunkt ohne Hindernis mit Hilfe des erfindungsgemässen Verfahrens.

Show it:

FIG. 1

a wall saw system comprising a guide rail and a wall saw;

FIGS. 2A, B

the processing of a separation cut between a first and second free end point without hindrance;

FIGS. 3A, B

the machining of a separating cut between a first and second obstacle with a saw blade that is not surrounded by a blade guard;

FIGS. 4A, B

the machining of a separating cut between a first and second obstacle with a saw blade, which is surrounded by a blade guard;

FIGS. 5A-N

the wall sawing system of FIG. 1 when creating a separating cut between a first free end point without obstacle and a second free end point without obstacle with the aid of the method according to the invention; and

FIGS. 6A-H

the wall sawing system of FIG. 1 when creating a further separating cut between an obstacle and a free end point without obstacle with the aid of the method according to the invention.

FIG. 1 shows a wall saw 10 with a guide rail 11, one arranged displaceably on the guide rail 11, the tool unit 12 and a remote control 13. The power tool is designed as a wall saw 12 and comprises a processing unit 14 and a motor drive unit 15. The processing unit is configured as a saw head 14 and includes a saw blade designed as a machining tool 16, which is attached to a saw arm 17 and is driven by a drive motor 18 about a rotational axis 19th

To protect the operator, the saw blade 16 is surrounded by a blade guard 21 which is secured by means of a blade protection holder on the saw arm 17. The saw arm 17 is formed by a pivot motor 22 about a pivot axis 23 pivotally. The swivel angle α of the saw arm 17 determines, with a saw blade diameter D of the saw blade 16, how deep the saw blade 16 dips into a workpiece 24 to be machined. The drive motor 18 and the pivot motor 22 are arranged in a device housing 25 . The motor-driven feed unit 15 comprises a guide carriage 26 and a feed motor 27, which is likewise arranged in the device housing 25 in the exemplary embodiment. The saw head 14 is mounted on the guide carriage 26 and formed on the feed motor 27 along the guide rail 11 in a feed direction 28 slidably. In the device housing 25, a control unit 29 for controlling the saw head 14 and the motor feed unit 15 is arranged in addition to the motors 19, 22, 27.

For monitoring the wall sawing system 10 and the machining process, a sensor device is provided with a plurality of sensor elements. A first sensor element 32 is designed as a swivel angle sensor and a second sensor element 33 as a displacement sensor. The swivel angle sensor 32 measures the current swivel angle of the saw arm 17 and the displacement sensor 33 measures the current position of the saw head 14 on the guide rail 11. The measured variables are transmitted from the swivel angle sensor 32 and displacement sensor 33 to the control unit 29 and used to control the wall saw 12.

The remote control 13 comprises a device housing 35, an input device 36, a display device 37 and a control unit 38, which is arranged in the interior of the device housing 35. The control unit 38 converts the inputs of the input device 36 into control commands and data, which are transmitted to the wall saw 12 via a first communication link. The first communication connection is designed as a wireless and wireless communication connection 41 or as a communication cable 42 . The wireless and wireless communication connection is formed in the embodiment as a radio link 41, which is formed between a first radio unit 43 on the remote control 13 and a second radio unit 44 on the power tool 12. Alternatively, the wireless and wireless communication link 41 may be in the form of an infrared, Bluetooth, Wi-Fi or Wi-Fi connection.

FIGS. 2A B show the guide rail 11 and the wall saw 12 of the wall sawing system 10 of FIG FIG. 1 when creating a separating cut 51 in the workpiece 24 of the workpiece thickness d. The separating cut 51 has an end depth T and extends in the feed direction 28 between a first end point E ₁ and a second end point E ₂ . As the X direction , a direction parallel to the feed direction 28 is defined, with the positive X direction directed from the first end point E ₁ to the second end point E ₂ , and as the Y direction is a direction perpendicular to the X direction in the depth of the workpiece 24 defined.

The end point of a separation cut can be defined as a free end point without hindrance or as an obstacle. Both endpoints can be defined as free endpoints without obstacles, both endpoints as obstacles or one endpoint as a free endpoint and the other endpoint as an obstacle. At a free endpoint without obstacle, an overlap may be allowed. Due to the overlapping, the cutting depth at the end point reaches the final depth T of the separating cut. In the embodiment of FIGS. 2A , B form the end points E ₁ , E ₂ free end points without obstruction, wherein at the free first end point E _1, an overlapping is not allowed and at the second end point E _2, an overlap is done.

FIG. 2A shows the saw head 14 in a mounting position X ₀ and the saw arm 17 in a basic position of 0 °. The saw head 14 is positioned by the operator by means of the guide carriage 26 in the mounting position X ₀ on the guide rail 11. The mounting position X _{0 of} the saw head 14 is between the first and second end point E ₁ , E ₂ and is determined by the position of the pivot axis 23 in the feed direction 28. The position of the pivot axis 23 is particularly suitable as a reference position X _Ref for the position monitoring of the saw head 14 and the control of the wall saw 12, since the X position of the Swivel axis 23 remains unchanged even during the pivoting movement of the saw arm 17. Alternatively, another X position on the saw head 14 can be set as the reference position, in which case the distance in the X direction to the pivot axis 23 must additionally be known.

The X positions of the first and second end points E ₂ are defined in the embodiment by the entry of part lengths. The distance between the mounting position X ₀ and the first end point E ₁ determines a first part length L ₁ and the distance between the mounting position X ₀ and the second end point E ₂ a second part length L ₂ . Alternatively, the X positions of the end points E ₁ , E _{2 can be} defined by entering a partial length (L ₁ or L ₂ ) and a total length L as the distance between the end points E ₁ , E ₂ .

The separating cut 51 is created in several partial sections until the desired final depth T is reached. The partial sections between the first and second end points E ₁ , E ₂ are defined as main sections and the cutting sequence of the main sections as the main section sequence. At the end points of the separating cut, additional corner processing can be carried out, which in the case of an obstacle is referred to as obstacle processing and in the case of a free end point with overlapping as overcut processing.

The main cutting sequence can be specified by the operator or the control unit of the wall sawing system determines the main cutting sequence depending on several boundary conditions. Usually, the first main section, which is also referred to as a precut, is executed with a reduced depth of cut and a reduced power of the drive motor in order to prevent polishing of the saw blade. The other major sections are usually performed with the same depth of cut, but may also have different depths of cut. The boundary conditions usually defined by an operator include the depth of cut of the precut, the power of the precut, and the maximum depth of cut of the other major sections. From these constraints, the control unit can determine the main cutting sequence.

The main sections of a separating cut are made with a saw blade diameter or with two or more saw blade diameters. If multiple saw blades are used, machining usually begins with the smallest saw blade diameter. In order to mount the saw blade 16 on the saw arm 17, the saw blade 16 must be arranged in the basic position of the saw arm 17 above the workpiece 24. Whether this boundary condition is satisfied depends on two device-specific sizes of the wall sawing system 10, on the one hand by a vertical distance Δ between the pivot axis 23 of the saw arm 17 and a top 53 of the workpiece 24 and on the other by a saw arm length δ of the saw arm 17, which Distance between the axis of rotation 19 of the saw blade 16 and the pivot axis 23 of the saw arm 17 is defined. If the sum of these two device-specific sizes is greater than half the saw blade diameter D / 2, the saw blade 16 is arranged in the basic position above the workpiece 24. The saw arm length δ is a fixed device-specific size of the wall saw 12, whereas the vertical distance Δ between the pivot axis 23 and the surface 53 in addition to the geometry of the wall saw 12 also depends on the geometry of the guide rail 11 used.

The saw blade 16 is mounted on a flange on the saw arm 17 and is driven by the drive motor 18 about the axis of rotation 19 in the sawing operation. In the basic position of the saw arm 17, which in FIG. 2A is illustrated, the pivot angle is 0 ° and the axis of rotation 19 of the saw blade 16 is in the depth direction 52 above the pivot axis 23. The saw blade 16 is moved by a pivoting movement of the saw arm 17 about the pivot axis 23 from the basic position at 0 ° in the workpiece 24. During the pivoting movement of the saw arm 17, the saw blade 16 is driven by the drive motor 18 about the axis of rotation 19.

To protect the operator, the saw blade 16 should be surrounded by the blade guard 21 during operation. The wall saw 12 is operated with blade guard 21 or without blade guard 21. For processing the separating cut in the region of the end points E ₁ , E ₂ , a disassembly of the blade guard 21 may be provided, for example. If different saw blade diameters are used to machine the cut, various blade protectors with appropriate blade guard widths are usually used.

FIG. 2 B shows the saw arm 17, which is inclined in a negative rotational direction 54 at a negative pivot angle -α. The saw arm 17 is adjustable in the negative direction of rotation 54 between pivot angles of 0 ° to -180 ° and adjustable in a direction opposite to the negative direction of rotation 54, positive direction of rotation 55 between pivot angles of 0 ° to + 180 °. In the FIG. 2 B shown arrangement of the saw arm 17 is referred to as a pulling arrangement when the saw head 14 is moved in a positive feed direction 56 . If the saw head 14 is moved in a direction opposite to the positive feed direction 56, negative feed direction 57 , the arrangement of the saw arm 17 is referred to as an abutting arrangement.

With a swivel angle of ± 180 °, the maximum penetration depth of the saw blade 16 into the workpiece 24 is achieved. Due to the pivotal movement of the saw arm 17 about the pivot axis 23, the position of the rotation axis 19 in the X direction and in the Y direction is shifted. Here, the displacement of the axis of rotation 19 of the Sägearmlänge δ and the Swivel angle α of the saw arm 17 dependent. The displacement δ _x in the X direction is δ sin (± α), and the displacement δ _y in the Y direction is δ · cos (± α).

The saw blade 16 generates in the workpiece 24 a cutting wedge in the form of a circle segment with a height h and a width b. The height h of the circular segment corresponds to the penetration depth of the saw blade 16 into the workpiece 24. For the penetration depth h, the relationship D / 2 = h + Δ + δ · cos (α), where D is the saw blade diameter, h is the penetration depth of the saw blade 16, Δ denotes the perpendicular distance between the pivot axis 23 and the upper side 53 of the workpiece 24, δ the saw arm length and α the first pivot angle, and for the width b the relationship b ² = D / 2 × 8h-4h ² = 4Dh-4h ² applies = 4h · (D - h), where h is the depth of penetration of the saw blade 16 into the workpiece 24 and D is the saw blade diameter.

The control of the wall saw 12 during the separating cut depends on whether the end points are defined as obstacles, and on an obstacle whether the processing is performed with blade guard 21 or without blade guard 21. In a free end point without hindrance, the control of the wall saw 12 in the process according to the invention via upper exit points of the saw blade 16 at the top 53 of the workpiece 24. The upper exit points of the saw blade 16 can be from the reference position X _Ref the pivot axis 23 in the X direction, calculate the displacement δ _{x of} the rotation axis 19 in the X direction and the width b. An upper exit point facing the first end point E ₁ is referred to as a first upper exit point 58 and an upper exit point facing the second end point E ₂ as a second upper exit point 59. For the first upper exit point 58, X (58) = X _Ref + δ _x - b / 2 and for the second upper exit point 59, X (59) = X _Ref + δ _x + b / 2 where b = √ [h · (D - h)] and h = h (α, D ).

If the end points E ₁ , E ₂ are defined as obstacles, it is not possible to drive over the end points E ₁ , E ₂ with the wall saw 12. In this case, the control of the wall saw 12 in the method according to the invention on the reference position X _Ref the pivot axis 23 and the boundary of the wall saw 12. There is a distinction between a processing without blade guard 21 and a processing with blade guard 21.

FIGS. 3A B show the wall sawing system 10 when creating a separating cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, the machining being done without blade guard 21. During processing without blade guard 21, a first saw blade edge 61, which faces the first end point E ₁ , and a second saw blade edge 62, which faces the second end point E ₂ , form the boundary of the wall saw 12.

The X positions of the first and second saw blade edges 61, 62 in the X direction can be calculated from the reference position X _{Ref of} the pivot axis 23, the displacement path δ _{x of} the rotation axis 19 and the saw blade diameter D. FIG. 3A shows the wall saw 12 with the, in the negative rotational direction 54 at a negative swivel angle -α (0 ° to -180 °) inclined saw arm 17. For the first saw blade edge 61 X (61) = X _Ref + δ · sin (-α ) - D / 2 and for the second saw blade edge 62, X (62) = X _Ref + δ · sin (-α) + D / 2. FIG. 3B shows the wall saw 12 with the, in the positive direction of rotation 55 at a positive pivoting angle α (0 ° to + 180 °), inclined saw arm 17. For the first saw blade edge 61 X (61) = X _Ref + δ · sin (α) - D / 2 and for the second saw blade edge 62, X (62) = X _Ref + δ · sin (α) + D / 2.

FIGS. 4A B show the wall sawing system 10 when creating a separation cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, wherein the processing is performed with blade guard 21. When processing without blade guard 21 form a first blade protection edge 71, which faces the first end point E ₁ , and a second blade protection edge 72, which faces the second end point E ₂ , the boundary of the wall saw 12th

The X positions of the first and second blade protection edges 71, 72 in the X direction can be calculated from the reference position X _{Ref of} the pivot axis 23, the displacement path δ _{x of} the rotation axis 19 and the blade guard width B. FIG. 4A shows the wall saw 12 with the, under a negative pivot angle -α (0 ° to -180 °), inclined saw arm 17 and the mounted blade guard 21 of the blade guard width B. In an asymmetric blade protection before the start of the controlled machining, the distances of the rotation axis 19th determined to the blade guard edges 71, 72, wherein the distance to the first blade protection edge 71 as a first distance B _a and the distance to the second blade protection edge 72 as a second distance B _{b are} designated.

For the first blade protection edge 71, X (71) = X _Ref + δ · sin (α) -Ba _, and for the second blade protection edge 72, X (72) = X _Ref + δ · sin (α) + B _b . FIG. 4B shows the wall saw 12 with the, under a positive pivot angle α (0 ° to + 180 °), inclined saw arm 17 and the mounted blade guard 21 of the blade guard width B. For the first blade guard edge 71 X (71) = X _Ref + δ · sin (α) _-Ba and for the second blade guard edge 72, X (72) = X _Ref + δ · sin (α) + B _b .

FIGS. 2A , B show a separation section between two end points E ₁ , E ₂ , which are defined as free end points without obstacle, and FIGS. 3A , B and 4A, B show a separation cut between two end points E ₁ , E ₂ , which are defined as obstacles. In practice, cuts are also possible in which one end point is defined as an obstacle and the other end point represents a free end point without hindrance, wherein the control of the wall saw at the free end point over the upper exit point of the saw blade and at the obstacle over the saw blade edge (machining without blade protection 21) or the blade protection edge (machining with blade guard 21).

The first upper exit point 58, the first saw blade edge 61 and the first blade guard edge 71 are grouped together under the term "first boundary" of the wall saw 12 and the second upper exit point 59, the second saw blade edge 62 and the second blade guard edge 72 are termed "second Limitation ".

FIGS. 5A-N show the wall saw system 10 of FIG. 1 with the guide rail 11 and the wall saw 12 when creating a separation cut of the final depth T in the workpiece 24 between the first end point E ₁ , which is defined as a free end point without obstacle, and the second end point E ₂ , which is also defined as a free end point without obstruction , The control of the wall saw 12 takes place at the first end point E ₁ via the first upper exit point 58 of the saw blade used and at the second end point E ₂ via the second upper exit point 59 of the saw blade used.

The processing of the separating cut is carried out with the aid of the method according to the invention for controlling a wall sawing system. The separating cut comprises a main cutting sequence of at least two main cuts, which are carried out between the first end point E ₁ and the second end point E ₂ , as well as a first corner machining at the first end point E ₁ and a second corner machining at the second end point E ₂ . If overlapping at an endpoint is allowed, an overflow sequence is defined for the free endpoint, otherwise a corner intersection is defined.

The main cutting sequence comprises a first main section with a first main cutting angle α _{1 of} the saw arm 17, a first diameter D _{1 of} the saw blade used, a first penetration depth h _{1 of} the saw blade used in the workpiece 24 and a first width B _{1 of} the blade guard used and a subsequent second Main section with a second main cutting angle α _{2 of} the saw arm 17, a second diameter D _{2 of} the saw blade used, a second penetration depth h _{2 of} the saw blade used in the workpiece 24 and a second width B _{2 of} the blade guard used.

The first and second main section are performed in the embodiment with the same blade 16 and the same blade guard 21. Therefore, the first diameter D _{1 of} the first main section and the second diameter D _{2 of} the second main section coincide with the saw blade diameter D of the saw blade 16, and the first width B _{1 of} the first main section and the second width B _{2 of} the second main section coincide with the blade guard width B of the saw blade 16 match. In the embodiment, the blade guard 21 constructed symmetrically and the distance of the rotation axis 19 to the blade guard edges 71, 72 corresponds to B / 2. In the case of an asymmetrical blade guard, the first distance B _a to the first blade protection edge 71 and the second distance B _b to the second blade protection edge 72 are used.

FIG. 5A shows the wall saw 12 in the mounting position X _{0 of} the saw head 14 and the basic position 0 ° of the saw arm 17. After the start of the method according to the invention, the saw head 14 is moved from the mounting position X ₀ in a start position X _start ( FIG. 5B ). In the exemplary embodiment, the processing of the first main section begins at the first end point E ₁ . In the starting position X ₁ , the pivot axis 23 has a distance of √ [h ₁ * (D ₁ -h ₁ )] -δ · sin (-α ₁ ) to the first end point E ₁ , where h ₁ = h (-α ₁ , D ₁₎ = D _1/2 - δ - δ · cos (-α ₁₎ the depth of penetration of the saw blade 16 used in the workpiece 24 at negative first main cutting angle -α ₁ designates.

For piercing the saw blade 16 in the workpiece 24, the saw blade 16 is driven by the drive motor 18 about the rotation axis 19 and the saw arm 17 pivoted from the basic position 0 ° in the negative direction of rotation 54 about the pivot axis 23. The swivel angle of the saw arm 17 is measured regularly by the swivel angle sensor 32 during the swiveling movement. As soon as the negative first main cutting angle -α _{1 is} reached, the pivotal movement of the saw arm 17 is interrupted ( FIG. 5C ). When positioning the saw head 14 in FIG. 5B the distance from the first end point E is set ₁ so that the, the first endpoint E ₁ facing, first upper exit point 58 of the saw blade 16 by the pivotal movement of the saw arm 17 -α in the negative first main cutting angle ₁ with the first endpoint E ₁ coincide.

The saw head 14 is moved in the positive feed direction 56 to the second end point E ₂ ( FIG. 5D ). During the feed movement, the position of the saw head 14 is regularly measured by the displacement sensor 33. The feed movement is stopped when the pivot axis 23 has a distance of √ [h ₁ * (D ₁ -h ₁ )] + δ * sin (-α ₁ ) to the second end point E ₂ ( FIG. 5E ). Subsequently, the saw arm 17 is pivoted in the positive direction of rotation 55 about the pivot axis 23 from the negative first main cutting angle -α ₁ into the positive first main cutting angle + α ₁ ( FIG. 5F ). In the calculation of the distance to the second end point E ₂ , the displacement of the rotation axis 19 by the swinging from -α ₁ to + α _{1 was} taken into account. The distance was adjusted so that the, the second end point E ₂ facing, the second upper exit point 59 of the saw blade 16 after the pivotal movement of the saw arm 17 in the positive first main cutting angle + α ₁ coincides with the second end point E ₂ .

By pivoting the saw arm 17 remains in the region of the pivot axis 23 residual material that still needs to be removed by the saw blade 16. The residual material can be removed in a separate step or the residual material is removed in the following main section. At the in FIG. 5G illustrated embodiment, the residual material is completely removed in the first main section. For this purpose, the saw head 14 after pivoting in the negative feed direction 57 by a path length of 2δ · | sin (-α ₁ ) | postponed ( FIG. 5G ). After the removal of the first main section is completed and the second main section begins with the positioning of the saw head 14th

The saw head 14 is positioned in the feed direction 28 such that the pivot axis 23 is at a distance of √ [h ₂ * (D ₂ -h ₂ )] + δ * sin (+ α ₂ ) from the second end point E ₂ ( FIG. 5H ). In this position, the saw arm 17 is pivoted from the positive first main cutting angle + α ₁ into the positive second main cutting angle + α ₂ ( FIG. 5I ). When positioning in FIG. 5H the distance is adjusted so that the, the second end point E ₂ facing, the second upper exit point 59 of the saw blade 16 coincides after the pivoting movement of the saw arm 17 in the positive second main cutting angle + α ₂ with the second end point E ₂ .

The saw head 14 is moved in the negative feed direction 57 to the first end point E ₁ ( FIG. 5J ), wherein the position of the saw head 14 is measured regularly during the advancing movement of the displacement sensor 33. The feed movement is stopped when the pivot axis 23 has a distance of √ [h ₂ * (D ₂ -h ₂ )] -δ * sin (+ α ₂ ) to the first end point E ₁ ( FIG. 5K ). The saw arm 17 is pivoted in the negative direction of rotation 54 and arranged in the negative second main section angle -α ₂ ( FIG. 5L ). When setting the distance to the first end point E ₁ in FIG. 5K the distance was adjusted so that the, the first end point E ₁ facing first upper exit point 58 of the saw blade 16 after the pivotal movement of the saw arm 17 in the negative second main section angle -α ₂ coincides with the first end point E ₁ .

To remove the residual material, the saw head 14 is moved in the positive feed direction 56 by a path length of 2δ · | sin (-α ₂ ) | postponed ( FIG. 5 M ). After removal of the second main section and thus also the separation section between the first and second end points E ₁ , E _{2 are} completed. At the end of the method according to the invention, the saw arm 17 is moved to the basic position 0 ° ( FIG. 5N ).

In the FIGS. 5E to 5H are a complete removal of the residual material at the end of the first main section and the positioning of the saw head 14 for the second main section shown. In a first alternative variant, the removal of the residual material and the positioning of the saw head 14 summarized. After swiveling the saw arm 17 into the positive first main cutting angle + α ₁ , the saw head 14 is moved in the negative feed direction 57 until the pivot axis 23 is at a distance of √ [h ₂ * (D ₂ -h ₂ )] -δ · sin (FIG. + α ₂ ) to the second end point E ₂ . The distance is adjusted so that the second upper exit point 59 of the saw blade 16 after the pivotal movement of the saw arm 17 in the positive second main cutting angle + α ₂ coincides with the second end point E ₂ .

In an alternative second variant eliminates the removal of the residual material. The saw head 14 is stopped by the control unit 29 in a position in which the pivot axis 23 in the feed direction 28 a distance of √ [h ₂ · (D ₂ - h ₂ )] - δ · sin (+ α ₂ ) to the second end point E ₂ has. In this position, the saw arm 17 is pivoted from the negative first main cutting angle -α ₁ into the positive second main cutting angle + α ₂ . The distance is set so that the, the second end point E ₂ facing, the second upper exit point 59 of the saw blade 16 after the pivotal movement of the saw arm 17 in the positive second main cutting angle + α ₂ coincides with the second end point E ₂ . The variant without removal of the residual material has the lowest non-productive times of the three variants; However, a powerful drive motor 18 is required, which can handle the greater depth of cut at the end point.

FIGS. 5A-N show a main cutting sequence with a first and second main section. The number of main sections depends inter alia on the final depth T of the separating cut, the material of the workpiece 24 and the power of the drive motor 18. The main cutting angles α _i and penetration depths h _{i of} the individual main sections can be determined by the operator or the control unit 29 of the wall saw 12 calculates the main cutting angles or penetration depths for the individual main sections from the boundary conditions of the separating section.

FIGS. 6A-H show the wall saw system 10 with the wall saw 12 in creating another separation cut between a first end point E ₁ , which is an obstacle, and a second end point E ₂ , which is defined as a free end point without obstruction. The control of the wall saw 12 takes place at the first end point E ₁ via the first saw blade edge 61 (without blade guard 21) or the first blade protection edge 71 (with blade guard 21) and at the second end point E ₂ via the second upper exit point 59 of the saw blade used.

The processing of the separating cut is carried out with the aid of the method according to the invention for controlling a wall sawing system. The separation cut is made in several main sections until the desired final depth T is reached.

The main cutting sequence comprises a first main section with a first main cutting angle α _{1 of} the saw arm 17, a first diameter D ₁ and a first penetration depth h _{1 of} the saw blade used, a second main section with a second main cutting angle α _{2 of} the saw arm 17, a second diameter D ₂ and a second penetration depth h _{2 of} the saw blade used and a third main section with a third main section angle α _{3 of} the saw arm 17, a third diameter D ₃ and a third penetration depth h _{3 of} the saw blade used.

The first main section is performed in the exemplary embodiment with a first saw blade 16.1 and a first blade guard 21.1 , the first saw blade 16.1 having a first saw blade diameter D.1 and the first blade guard 21.1 having a first blade guard width B.1 . The first diameter D _{1 of} the first main section coincides with the first saw blade diameter D. ₁ of the first saw blade 16. ₁ , likewise the first width B ₁ of the first main section coincides with the first blade guard width B. ₁ of the first blade guard 21.

The second main section and the third main section are performed in the exemplary embodiment with a second saw blade 16.2 and a second blade guard 21.2 . The second saw blade 16.2 has a second blade diameter D.2 and the second blade guard 21.2 has a second blade guard width B.2 . The second diameter D _{2 of} the second main section and the third diameter D _{3 of} the third main section coincide with the second saw blade diameter D.2 of the second saw blade 16.2, likewise the second width B _{2 of} the second main section and the third width B _{3 of} the third main section with the second blade guard width B.2 of the second blade guard 21.2 match.

The editing of the separation cut begins at the first end point E ₁ . Since the first blade guard 21.1 is mounted, the control of the wall saw 12 takes place at the first end point E ₁ via the first blade protection edge 71.1 of the first blade guard 21.1. After the start of the method the saw head 14 is positioned in a starting position, in which the pivot axis 23 a distance of B _1/2 - has δ · sin (-α ₁₎ to the first end point e. ₁ In the starting position of the saw arm 17 is pivoted from the basic position 0 ° in the negative direction of rotation 54 in the negative first main cutting angle -α ₁ and the saw head 14 with the under -α ₁ inclined saw arm 17 in the positive feed direction 56 ( FIG. 6A ).

The saw head 14 is moved in the positive feed direction 56 until the pivot axis 23 has a distance of √ [h ₁ * (D ₁ -h ₁ )] + δ * sin (+ α ₁ ) to the second end point E ₂ , where h ₁ = h (+ α _1, D ₁₎ = D _1/2 - Δ - δ · cos (α + _1), the penetration depth of the first saw blade in the 16.1 Workpiece 24 at the positive first main cutting angle + α ₁ with the first diameter D ₁ , which corresponds to the first blade diameter D.1, respectively. Subsequently, the saw arm 17 is pivoted in the positive direction of rotation 55 in the positive first main cutting angle + α ₁ and removed the residual material.

To change the saw blade from the first saw blade 16.1 to the second saw blade 16.2 the saw head 14 is positioned in a parking position and the saw arm 17 is pivoted to the basic position of 0 ° ( FIG. 6B ). The parking position is selected so that pivoting and dismounting of the first saw blade 16.1 and first blade guard 21.1 and mounting and pivoting of the second saw blade 16.2 and second blade guard 21.2 is possible. In addition, the travel of the saw head 14 for the second main section should be as low as possible; Ideally, the parking position corresponds to the starting position for the second main section.

Since the second end point E _{2 represents} a free end point without hindrance, the disassembly of the first saw blade 16.1 and first blade guard 21.1 and the assembly of the second saw blade 16.2 and second blade guard 21.2 are easily possible. In the parking position, the pivot axis has a distance of √ [h ₂ * (D ₂ -h ₂ )] + δ * sin (+ α ₂ ) to the second end point E ₂ , where h ₂ = h (+ α ₂ , D ₂ ) = D _2/2 - Δ - δ · cos (+ α ₂ ) the penetration depth of the saw blade 16.2 used into the workpiece 24 at the positive second main cutting angle + α ₂ with the second diameter D ₂ , which corresponds to the second saw blade diameter D.2, designated. The distance was set in the park position so that the, the second end point E ₂ facing, the second upper exit point 59.2 of the second saw blade 16.2 coincides after pivotal movement of the saw arm 17 in the positive second main cutting angle + α ₂ with the second end point E ₂ ( FIG. 6C ).

After assembly of the second saw blade 16.2 and second blade guard 21.2 and the resumption of the controlled processing, the wall saw 12 is positioned in the park position. The saw head 14 is moved with the, under the positive second main cutting angle + α ₂ , inclined saw arm 17 and the rotating second saw blade 16.2 in the negative feed direction 57. The transition from the second main section to the third main section is made by a complete removal of the residual material ( FIG. 6D ) or alternatively by a partial removal of the residual material or without ablation. The wall saw is controlled by means of the first blade protection edge 71.2 of the second blade guard 21.2.

The positioning of the saw head 14 for the third main section with a main cutting angle of -α ₃ = -180 ° takes place by means of the critical angle α _crit of -90 °. The pivot axis 23 has a distance of B.2 / 2 - δ · sin (-90 °) = B.2 / 2 + δ to the first end point E ₁ . Subsequently the saw arm 17 is pivoted into the negative third main section angle of -α ₃ = -180 ° ( FIG. 6E ). Since the third main section represents the last main section of the main cutting sequence, a corner processing of the first end point E ₁ takes place before the processing of the last main section. For this purpose, the saw head 14 with the below -α ₃ = -180 ° inclined saw arm 17 ( FIG. 6F ) in the negative feed direction 57 until the first blade guard edge 71.2 of the second blade guard 21.2 coincides with the first end point E ₁ . The corner processing of the first end point E ₁ can be improved if the second blade guard 21.2 is dismantled and the corner processing takes place without blade protection. Without blade guard, the saw head 14 is moved in the negative feed direction 57 with the saw arm 17 inclined at -α ₃ = -180 °, until the first saw blade edge 61.2 of the second saw blade 16.2 coincides with the first end point E ₁ .

The third main section is executed with the saw arm 17 tilted in the positive feed direction 56, inclined at the negative third main section angle -α ₃ . The feed movement of the saw head 14 is stopped, if the pivot axis 23 a distance of √ [h ₃ x (D3 - h _3)] + δ · sin (180 °) = √ [h ₃ x (D ₃ - h _3)] to second endpoint comprising e _2, where h ₃ = h (-α ₃ D ₃₎ = D _3/2 - Δ - δ · cos (-180 °) = D _3/2 - Δ + δ, the penetration depth of the saw blade in the Workpiece 24 at the negative third main cutting angle -α ₃ = -180 ° with the third diameter D ₃ , which corresponds to the second saw blade diameter D.2, respectively. If an overcut is permitted at the second end point E ₂ , after the last main section a corner processing of the second end point E _{2 takes place} ( FIG. 6H )

At the in FIGS. 5A-N and FIGS. 6A-H shown separating sections, the pivotal movement of the saw arm 17 in a main cutting angle in each case in a pivoting movement. For hard materials or less powerful drive motors 18 for the saw blade 16, it may be advantageous to perform the pivoting movement of the saw arm 17 in at least two steps with an intermediate angle, wherein between the pivoting movements in the intermediate angle in each case a free cutting of the saw blade 16.

Claims (20)

A method for controlling a wall sawing system (10) comprising a guide rail (11) and a wall saw (12) having a saw head (14), a motorized feed unit (15), the saw head (14) parallel to a feed direction (28) along the guide rail (11) displaces at least one saw blade (16) mounted on a saw arm (17) of the saw head (14) pivotable about a pivot axis (23) and driven about an axis of rotation (19) and at least one of the saw blade (16) surrounding, releasable blade guard (21) when creating a separation cut (51) of the final depth (T) in a workpiece (24) of the workpiece thickness (d) between a first end point (E ₁ ) and a second end point (E ₂ ) With: ▪ before starting a processing of the separating cut (51) controlled by a control unit (29) of the wall saw (12), at least the saw blade diameter (D) of the at least one saw blade (16), the positions of the first and second end points (E ₁ , E ₂ ) in the feed direction (28), the final depth (T) of the separating cut (51) and a main cutting sequence of m main cuts with m ≥ 2, the main cutting sequence having at least a first main cut with a first main cutting angle (α ₁ ) of the saw arm (17) and a first diameter (D ₁ ) of the saw blade used in the first main section and a following second main section having a second main section angle (α ₂ ) of the saw arm (17) and a second diameter (D ₂ ) of the saw blade used in the second main section, ▪ during the processing controlled by the control unit (29) the saw arm (17) is arranged in a negative rotational direction (54) under the negative first main cutting angle (-α ₁ ), - The saw head (14) in a positive feed direction (56) in the direction of the second end point (E ₂ ) proceed, with the saw arm (17) is in a pulling arrangement, and - The saw arm (17) in a negative direction of rotation (54) directed counter to the positive direction of rotation (55) from the negative first main section angle (-α ₁ ) in a new pivot angle (+ α ₁ , + α ₂ ), characterized in that the saw head (14) is moved in the controlled processing so that after the pivotal movement of the saw arm (17) in the new pivot angle (+ α ₁ , + α ₂ ) one, the second end point (E ₂ ) facing the second Limit (59, 62, 72) of the wall saw (12) coincides with the second end point (E ₂ ), wherein the second boundary (59, 62, 72) of the wall saw (12) is formed at an upper side (53) of the workpiece (24) by a second upper exit point (59) of the saw blade used facing the second end point (E ₂ ), if the second end point (E ₂ ) represents a free end point without hindrance, by a second saw blade edge (62) of the saw blade used, facing the second end point (E ₂ ), if the second end point (E ₂ ) constitutes an obstacle and the machining done without blade protection, and by one, the second end point (E ₂ ) facing the second blade guard edge (72) of the blade guard used when the second end point (E ₂ ) is an obstacle and the processing is done with blade guard. A method according to claim 1, characterized in that prior to the start of the control unit (29) controlled machining in addition a Sägearmlänge (δ) of the saw arm (17), as the distance between the pivot axis (23) of the saw arm (17) and the axis of rotation (19) of the saw blade (16) is defined, and a distance (Δ) between the pivot axis (23) and the top (53) of the workpiece (24) are fixed. A method according to claim 2, characterized in that prior to the start of the controlled processing additionally defines a first width (B ₁ ) for a, used in the first main section, blade protection and a second width (B ₂ ) for a, used in the second main section, blade protection is, wherein the first and second widths (B ₁ , B ₂ ) respectively of a first distance (B _1a , B _2a ) of the rotation axis (19) to the first blade guard edge (71) and a second distance (B _1b , B _2b ) Rotary axis (19) to the second blade protection edge (72) are composed. Method according to one of claims 2 to 3, characterized in that the saw arm (17) in the positive direction of rotation (55) from the negative first main cutting angle (-α ₁ ) in the positive first main cutting angle (+ α ₁ ) is pivoted and after the Pivoting movement in the positive first main cutting angle (+ α ₁ ) of the second upper exit point (59) of the saw blade used with the second end point (E ₂ ) coincides, when the pivot axis (23) a distance to the second end point (E ₂ ) of √ [h having] + δ · sin (+ α _1), wherein h ₁ = h (+ α _1, D ₁₎ = D _1/2 - ₁ * (h ₁ D ₁₎ - Δ - δ · cos (+ α ₁₎ the penetration depth of the saw blade used in the workpiece (24) at the positive first main cutting angle (+ α ₁ ) with the first diameter (D ₁ ), the second saw blade edge (62) of the saw blade used coincides with the second end point (E ₂ ), if the pivot axis (23) spaced from the second end point (e ₂₎ of D _1/2 + δ · sin (α + ₁ ), and the second blade guard edge (72) of the blade guard used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (E ₂ ) of B _1b + δ · sin (+ α ₁ ) having. A method according to claim 4, characterized in that the saw head (14) in a, to the positive feed direction (56) directed opposite, negative feed direction (57) by a path length of at least 2δ · | sin (+ α ₁ ) | is moved and the saw head (14) is then positioned so that the second boundary (59, 62, 72) of the wall saw (12) after the pivotal movement of the saw arm (17) in the positive second main cutting angle (+ α ₂ ) with the second End point (E ₂ ) coincides, wherein the second upper exit point (59) of the saw blade used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (E ₂ ) of √ [h ₂ * ( D ₂ - h _2)] + δ · sin (+ α _2), wherein h ₂ = h (+ α _2, D ₂₎ = D _2/2 - δ - δ · cos (+ α _2), the penetration depth of the used saw blade in the workpiece (24) at the positive second main cutting angle (+ α ₂ ) with the second diameter (D ₂ ), the second saw blade edge (62) of the saw blade used coincides with the second end point (E ₂ ) when the pivot axis ( 23) has a distance to the second end point (E ₂ ) of D _2/2 + δ · sin (+ α ₂ ), and the second sheet protection box nte (72) of the blade guard used coincides with the second end point (E ₂ ) when the pivot axis (23) has a distance from the second end point (E ₂ ) of B _2b + δ · sin (+ α ₂ ). A method according to claim 4, characterized in that the saw head (14) in the negative feed direction (57) is moved so that the second boundary (59, 62, 72) of the wall saw (12) after the pivoting movement of the saw arm (17) in the positive second main cutting angle (+ α ₂ ) coincides with the second end point (E ₂ ), wherein the second upper exit point (59) of the saw blade used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (e ₂₎ of √ [h ₂ · (D ₂ - h _2)] + δ · sin (+ α _2), wherein h ₂ = h (+ α _2, D ₂₎ = D _2/2 - Δ - δ · cos (+ α ₂ ) denotes the penetration depth of the saw blade used into the workpiece (24) at the positive second main cutting angle (+ α ₂ ) with the second diameter (D ₂ ), the second saw blade edge (62) of the saw blade used with the second end point (E ₂ ) coincides when the pivot axis (23) is at a distance from the second end point (E ₂ ) of D ₂ / 2 + δ · sin (+ α ₂ ), and the second blade guard edge (72) of the blade guard used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (E ₂ ) of B _2b + δ · sin (+ α ₂ ). Method according to one of claims 2 to 3, characterized in that the saw arm (17) in the positive direction of rotation (55) from the negative first main cutting angle (-α ₁ ) in the positive second main cutting angle (+ α ₂ ) is pivoted and after the Pivoting movement in the positive second main cutting angle (+ α ₂ ) of the second upper Exit point (59) of the saw blade used coincides with the second end point (E ₂ ) when the pivot axis (23) is a distance from the second end point (E ₂ ) of √ [h ₂ * (D ₂ - h ₂ )] + δ · sin (+ α ₂ ), where h ₂ = h (+ α ₂ , D ₂ ) = D _2/2 - Δ - δ · cos (+ α ₂ ) the penetration depth of the saw blade used in the workpiece (24) in the positive second Main cutting angle (+ α ₂ ) with the second diameter (D ₂ ), the second saw blade edge (62) of the saw blade used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (E ₂ ) of D _2/2 + δ · sin (+ α ₂ ), and the second blade guard edge (72) of the blade guard used coincides with the second end point (E ₂ ) when the pivot axis (23) is spaced from the second end point (E ₂ ) of B _2b + δ · sin (+ α ₂ ). Method according to one of claims 5 to 7, characterized in that the saw head (14) with the, under the positive second main cutting angle (+ α ₂ ), inclined saw arm (17) in the negative feed direction (57) is moved. A method according to claim 8, characterized in that the saw head (14) in the controlled by the control unit (29) processing is moved so that, the first end point (E ₁ ) facing the first boundary (58, 61, 71) of the wall saw (12) after the pivoting movement of the saw arm (17) from the positive second main cutting angle (+ α ₂ ) into a new pivot angle (-α ₂ , -α ₃ ) coincides with the first end point (E ₁ ), wherein the first boundary (58 , 61, 71) of the wall saw (12) is formed by a first upper exit point (58) of the saw blade used on the upper side (53) of the workpiece (24) facing the first end point (E ₁ ), if the first end point (E ₁ ) E ₁ ) represents a free end point without hindrance, by a, the first end point (E ₁ ) facing the first saw blade edge (61) of the saw blade used when the first end point (E ₁ ) is an obstacle and the processing is done without blade protection, and through one, the first endpoint t (E ₁ ) facing, first blade protection edge (71) of the blade guard used when the first end point (E ₁ ) is an obstacle and the processing is done with blade protection. Method according to claim 9, characterized in that the second main section represents the last main section of the main section sequence, the saw arm (17) in the negative direction of rotation (54) from the positive second main section angle (+ α ₂ ) to the negative second main section angle (-α ₂ ) is pivoted and after the pivoting movement in the negative second main section angle (-α ₂ ), the first upper exit point (58) coincides with the first end point (E ₁ ), when the pivot axis (23) spaced from the first end point (E ₁ ) of √ [h ₂ · (D ₂ - h ₂ )] - δ · sin (-α ₂ ), where h ₂ = h (-α ₂ , D ₂ ) = D _2/2 -Δ-δ · cos (- α ₂ ) the penetration depth of the saw blade used in the workpiece (24) at the negative second main cutting angle (-α ₂ ) with the second diameter (D ₂ ), the first saw blade edge (61) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23) spaced from the first end point (E ₁ ) of D _2/2 - δ · sin (-α ₂ ), and the first blade guard edge (71) of the blade guard used coincides with the first end point (E ₁ ) when the pivot axis (23) is at a distance to the first end point (E ₁ ) of B _2a - δ · sin (-α ₂ ). A method according to claim 10, characterized in that the saw head (14) in the positive feed direction (56) with the under the negative second main cutting angle (-α ₂ ) inclined saw arm (17) by a path length of at least 2δ · | sin (- α ₂ ) | is moved. A method according to claim 9, characterized in that the main cutting sequence to be carried out after the second main section third main section having a third main cutting angle (α ₃ ) of the saw arm (17), a third diameter (D ₃ ) of the saw blade used and a third width (B ₃ ) of the blade guard used having a first and second distance (B _3a , B _3b ) to the blade guard edges, wherein the saw arm (17) in the third main section is arranged in a pulling arrangement and the saw head (14) in the positive feed direction (56 ). A method according to claim 12, characterized in that the saw head (14) in the negative feed direction (57) is moved so that the first boundary (58, 61, 71) of the wall saw (12) after the pivoting movement of the saw arm (17) in the negative second main cutting angle (-α ₂ ) coincides with the first end point (E ₁ ), wherein the first boundary (58, 61, 71) through a, the first end point (E ₁ ) facing the first upper exit point (58) of the used Saw blade at the top (53) of the workpiece (24) is formed, when the first end point (E ₁ ) represents a free end point without obstruction, by a, the first end point (E ₁ ) facing the first saw blade edge (61) of the saw blade used when the first end point (E ₁ ) is an obstacle and the processing is performed without blade protection (21), and by a, the first end point (E ₁ ) facing, the first blade protection edge (71) of the blade protection used when the first end point (E ₁ ) an obstacle is and processing with blade protection (21) takes place. A method according to claim 13, characterized in that the saw head (14) in the positive feed direction (56) with the, under the negative second main cutting angle (-α ₂ ) inclined saw arm (17) by a path length of at least 2δ · | sin (- α ₂ ) | method is positioned, and the saw head (14) is then positioned so that the first boundary (58, 61, 71) of the wall saw (12) after the pivotal movement of the saw arm (17) in the negative third main section angle (-α ₃ ) with the first End point (E ₁ ) coincides, wherein the first upper exit point (58) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23) is spaced from the first end point (E ₁ ) of √ [h ₃ * ( D ₃ - h ₃ )] - δ · sin (-α ₃ ), where h ₃ = h (-α ₃ , D ₃ ) = D ₃ /2-Δ-δ · cos (-α ₃ ) the penetration depth of used saw blade in the workpiece (24) at the negative third main cutting angle (-α ₃ ) with the third diameter (D ₃ ), the first saw blade edge (61) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis ( 23) a distance from the first end point (e ₁₎ of D _3/2 -, δ · sin (-α _3), and the first sheet protection edge (71) of the Verweij When the pivot axis (23) is at a distance from the first end point (E ₁ ) of B _3a - δ · sin (-α ₃ ), the blade guard coincides with the first end point (E ₁ ). A method according to claim 13, characterized in that the saw head (14) in the positive feed direction (56) is moved so that the first boundary (58, 61, 71) of the wall saw (12) after the pivoting movement of the saw arm (17) in the negative third main cutting angle (-α ₃ ) coincides with the first end point (E ₁ ), wherein the first upper exit point (58) of the saw blade used coincides with the first end point (E ₁ ), when the pivot axis (23) is spaced from the first End point (E ₁ ) of √ [h ₃ · (D ₃ -h ₃ )] -δ · sin (-α ₃ ), where h ₃ = h (-α ₃ , D ₃ ) = D ₃ /2-Δ - δ · cos (-α ₃ ) the penetration depth of the saw blade used in the workpiece (24) at the negative third main cutting angle (-α ₃ ) with the third diameter (D ₃ ), the first saw blade edge (61) of the saw blade used with the first end point (e ₁₎ coincides, when the pivot axis (23) spaced from the first end point (e ₁₎ of D _3/2 - δ sin (-α _3), and the first sheet protection edge (71) of the blade guard used with the first end point (E ₁₎ coincides, when the pivot axis (23) spaced from the first end point (E ₁₎ of B _3a - δ · sin (-α ₃ ). A method according to claim 12, characterized in that the saw arm (17) in the negative rotational direction (54) from the positive second main cutting angle (+ α ₂ ) in the negative third main cutting angle (-α ₃ ) is pivoted and after the pivoting movement in the negative third main section angle (-α ₃ ), the first upper exit point (58) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23) is spaced from the first end point (E ₁ ) of √ [h ₃ * (D ₃ - h _3)] - δ · sin (-α _3), wherein h ₃ = h (-α ₃ D ₃₎ = D _3/2 - δ - δ · cos (-α ₃₎ the depth of penetration of the used Saw blade in the workpiece (24) at the negative third main cutting angle (-α ₃ ) with the third diameter (D ₃ ), the first saw blade edge (61) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23 ) spaced from the first end point (e ₁₎ of D _3/2 -, δ · sin (-α _3), and the first sheet protection edge (71) of the blade guard used with the first end point (e ₁₎ coincides, when the pivotal axis ( 23) has a distance from the first end point (E ₁ ) of B _3a - δ · sin (-α ₃ ). Method according to one of claims 1 to 16, characterized in that the first and second main section with a saw blade (16) and a blade guard (21) are performed. Method according to one of claims 1 to 16, characterized in that the first main section with a first saw blade (16.1) and a first blade guard (21.1) is performed, wherein the first saw blade (16.1) has a first saw blade diameter (D.1) and the first blade guard (21.1) having a first blade protection width (B.1), and the second main section with a second blade (16.2) and a second blade guard (21.2) is performed, wherein the second blade (16.2) has a second blade diameter (D.2 ) and the second blade guard (21.2) have a second blade guard width (B.2). Method according to one of claims 1 to 18, characterized in that the first main section of the main cutting sequence is a precut and the saw head (14) after the start of the controlled by the control unit (29) processing in a start position (X _Start ) is positioned, in the start position (X _start ) the, the first end point (E ₁ ) facing the first boundary (58, 61, 71) of the wall saw (12) after the pivoting movement in the negative first main section angle (-α ₁ ) with the first end point (E ₁ ) coincides. Method according to Claim 19, characterized in that the first upper exit point (58) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23) is at a distance from the first end point (E ₁ ) of √ [h ₁ . (D ₁ -h _1)] - δ * sin ₍₁ -α), wherein h ₁ = h (-α _1, D ₁₎ = D _1/2 - δ - δ · cos (-α ₁₎ the penetration depth the saw blade used in the workpiece (24) at the negative first main cutting angle (-α ₁ ) with the first diameter (D ₁ ), the first saw blade edge (61) of the saw blade used coincides with the first end point (E ₁ ) when the pivot axis (23) a distance from the first end point (e ₁₎ D _1/2 - has δ · sin (-α _1), and the first sheet protection edge (71) of the blade guard used with the first end point (E ₁ ) coincides when the pivot axis (23) has a distance from the first end point (E ₁ ) of B _1a - δ · sin (-α ₁ ).

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