EP3191279B1 - Method for controlling a wall saw system when creating a separating cut - Google Patents

Description

Technical area

The present invention relates to a method for controlling a wall saw system when making a separating cut according to the preamble of claim 1. EP1693173 B1 discloses such a method.

State of the art

Out EP 1 693 173 B1 a method for controlling a wall saw system when making a severing cut in a workpiece between a first end point and a second end point is known. The wall saw system comprises a guide rail and a wall saw with a saw head, a motorized feed unit that moves the saw head parallel to a feed direction along the guide rail and at least one saw blade that is attached to a saw arm of the saw head and driven by a drive motor about a rotary axis. The saw arm is designed to be pivotable about a pivot axis by means of a pivot motor. A pivoting movement of the saw arm around the pivot axis changes the penetration depth of the saw blade into the workpiece. The motorized feed unit comprises a guide carriage and a feed motor, the saw head being attached to the guide carriage and displaced along the guide rail by the feed motor. A sensor device with a swivel angle sensor and a displacement sensor is provided for monitoring the wall saw system. The swivel angle sensor measures the current swivel angle of the saw arm and the displacement 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 saw system is divided into a preparatory part and a processing of the separating cut controlled by the control unit. In the preparation part, the operator defines 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 to be machined Workpiece and the dimensions of embedded rebar. From the parameters entered, the control unit determines a suitable main cut sequence of main cuts for the separating cut, the main cut sequence at least a first main cut with a first main cutting angle of the saw arm and a first diameter of the saw blade used and a subsequent second main cut with a second main cutting angle of the saw arm and a first Includes diameter of the saw blade used.

The known method for controlling a wall saw system does not reveal any details as to how the saw blade and the blade guard are changed during the controlled processing of a severing cut.

Presentation of the invention

The object of the present invention is to develop a method for controlling a wall saw system with a high processing quality, in which the change of a saw blade and a blade guard is integrated into the controlled processing of a separating cut.

This object is achieved according to the invention in the method for controlling a wall saw system mentioned at the beginning by the features of the independent claim. Advantageous further developments are given in the dependent claims.

According to the invention it is provided that after the machining of the separating cut with the first saw blade, the controlled machining of the separating cut is interrupted by the control unit and the wall saw is moved into a parking position by the control unit.

• ▪ Demontieren des ersten Sägeblattes und ersten Blattschutzes,
• ▪ Montieren des zweiten Sägeblattes und zweiten Blattschutzes,
• ▪ Ausschwenken des Sägearms mit dem ersten Sägeblatt aus dem ersten Hauptschnittwinkel in die Grundposition und
• ▪ Einschwenken des Sägearms mit dem zweiten Sägeblatt aus der Grundposition in den zweiten Hauptschnittwinkel.

By integrating a saw blade change and blade guard change in the controlled processing with the control unit, all boundary conditions can be taken into account by the control unit and the wall saw can be positioned in a parking position in which all actions can be carried out when changing the saw blade and blade guard. When changing the saw blade from a first saw blade to a second saw blade and the blade guard from a first blade guard to a second blade guard to be considered as boundary conditions:

• ▪ Dismantling the first saw blade and first blade guard,
• ▪ Mount the second saw blade and second blade guard,
• ▪ Swiveling the saw arm with the first saw blade out of the first main cutting angle into the basic position and
• ▪ Swiveling the saw arm with the second saw blade from the basic position into the second main cutting angle.

The wall saw is preferably positioned in a resumption position after the saw blade has been changed from the first to the second saw blade and the controlled machining is resumed by the control unit. If the control unit determines a resumption position in addition to the park position, the operator can move the wall saw out of the park position by means of the motorized feed unit along the guide rail after the interruption. The ability to move the wall saw out of the parked position is advantageous for vertical or diagonal cuts in a wall, in which the parked position is arranged above a manageable assembly position. To dismantle the first piece of equipment (first saw blade and first blade guard) and assemble the second piece of equipment (second saw blade and second blade guard), the operator moves the saw head into an assembly position that is suitable for him. After resuming, the control unit uses the displacement sensor to check the current position of the wall saw. If the current position deviates from the resume position, the wall saw is positioned in the resume position.

According to the invention, a saw arm length of the saw arm, which is defined as the distance between the pivot axis of the saw arm and the axis of rotation of the saw blade, and a distance between the pivot axis of the saw arm and an upper side of the workpiece are additionally set before the start of the machining controlled by the control unit. Various parameters must be known to the control unit for the controlled processing of a severance cut. This includes the saw arm length, which is a fixed device-specific size of the wall saw, and the vertical distance between the pivot axis and the surface of the workpiece, which depends not only on the geometry of the wall saw but also on the geometry of the guide rail used.

When calculating the parking position for changing the saw blade and / or the blade guard, a distinction must be made between: The change takes place at a free end point without an obstacle (first embodiment), the saw blade is changed at an obstacle without a blade guard (second embodiment), the saw blade and the blade guard are changed to the second saw blade without a blade guard at an obstacle (third embodiment) and the saw blade and the blade guard are changed to a second saw blade and a second blade guard at an obstacle (fourth embodiment).

In the first embodiment, the second end point represents a free end point without obstacles and the second saw blade diameter of the second saw blade set before the start is used to calculate a first parking position and a resumption position, which corresponds to the first parking position. The pivot axis has in of the first parking position 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 ) denotes the depth of penetration of the second saw blade into the workpiece at the second main cutting angle with the preset second saw blade diameter.

As an alternative to the preset second saw blade diameter, the second saw blade diameter of the second saw blade can be set between a maximum second saw blade diameter and a minimum second saw blade diameter, the maximum second saw blade diameter being used to calculate a second parking position. In the case of a saw blade, the saw blade diameter changes as a result of wear during processing and decreases over time, the difference between the maximum and minimum second saw blade diameter corresponding to the height of the cutting segments.

In the second parking position, the pivot axis is at a distance from the second end point of √ [h _{2, max} · (D _max .2 - h _{2, max} )] + δ · sin (± α ₂ ), where h _{2, max} = h _max (± α ₂ , D _max .2) = D _max .2 / 2 - Δ - δ cos (± α ₂ ) denotes the maximum penetration depth of the second saw blade into the workpiece at the second main cutting angle with the maximum second saw blade diameter. The calculation of the second parking position with the maximum second saw blade diameter ensures that the second parking position is suitable for all actual saw blade diameters of the second saw blade.

After the controlled machining has been resumed, the wall saw is positioned in a resumption position which corresponds to the second parking position. The resumption of the controlled machining in the second parking position is possible for all actual saw blade diameters of the second saw blade; however, it has an inaccuracy in positioning.

Before the controlled machining is restarted, the actual second saw blade diameter of the second saw blade is preferably entered and used to calculate a restart position. In the newly calculated resumption position, the pivot axis has a distance to the second end point of √ [h ₂ · (D _real .2 - h ₂ )] + δ · sin (± α ₂ ), where h ₂ = h (± α ₂ , D _real .2) = D _real .2 / 2 - Δ - δ · cos (± α ₂ ) denotes the penetration depth of the second saw blade into the workpiece at the second main cutting angle with the actual second saw blade diameter. Entering the actual second saw blade diameter enables precise control of the wall saw. The parking position is calculated so that any permissible saw blade diameter can be fitted for the second saw blade. By calculating the resume position with the actual second saw blade diameter, the wall saw can be controlled via the upper exit points of the saw blade.

In the further embodiments, the second end point is defined as an obstacle and before the start of the controlled processing, a mounting distance is also established, the mounting distance being additionally used for calculating a third to fifth parking position. The mounting distance ensures that there is sufficient distance between the obstacle and the saw blade or between the obstacle and the blade guard for the operator to grasp the saw blade or the blade guard.

The control unit calculates different parking positions depending on the processing conditions. In the third parking position, the first and second saw blades are used without blade guards. In the fourth parking position, the first saw blade is surrounded by the first blade guard and machining with the second saw blade takes place without a blade guard. In the fifth parking position, there is a change from the first saw blade with the first blade guard to the second saw blade with a second blade guard. The parking positions must meet the four boundary conditions (dismantling, assembling, swiveling out and swiveling in) and are dependent on the first main cutting angle of the first main cut and the second main cutting angle of the second main cut.

In the third parking position, the first and second saw blades are used without blade guards. For the main cutting angles, a distinction must be made between three angle ranges -180 ° to 0 °, 0 ° to 90 ° and 90 ° to 180 °, so that a total of nine different distances result for the third parking position.

In the first angular range of the saw arm is arranged in front of the interruption of the controlled processing at a negative first main cutting angle between -180 ° and 0 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _assembly, D _2/2 + Δ _assembly] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. For all the negative first main intersection angle of displacement δ * sin (-α ₁₎ is negative and therefore basically applies D _1/2 + δ sin (-α ₁₎ <D _1/2 + Δ _assembly. If the second diameter D ₂ greater than first diameter D _1, D always applies _1/2 + Δ _assembly <D _2/2 + Δ _assembly.

In the second angular range of the saw arm is arranged before the interruption of controlled machining under a positive first main cutting angle between 0 ° and 90 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (α _1)] to -180 ° ≤ -α ₂ ≤ 0 °, Maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (α _1), D _2/2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ sin (90 °)] for 90 ° <α ₂ ≤ 180 °. For all the negative second main cutting angle is the displacement δ * sin (-α ₂₎ is negative and therefore basically applies D _2/2 + δ · sin (-α ₂₎ <D _2/2 + Δ _assembly,

In the third angular range of the saw arm is arranged before the interruption of controlled machining under a positive first main cutting angle between 90 ° and 180 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (90 °)] is -180 ° ≤ -α ₂ ≤ 0 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _assembly , D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In a first preferred embodiment, the preset first saw blade diameter of the first saw blade is used to calculate the third parking position for the first diameter of the first main cut and the preset second saw blade diameter of the second saw blade is used for the second diameter of the second main cut. After the controlled processing has been resumed, the wall saw is preferably positioned by the control unit in a resumption position which corresponds to the third parking position.

In a second preferred embodiment, the second saw blade diameter is adjustable between a maximum second saw blade diameter and a minimum second saw blade diameter, and the maximum second saw blade diameter is used to calculate the parking position for the second diameter of the second main cut. By calculating the parking position with the maximum second saw blade diameter, it is ensured that the parking position is suitable for all actual saw blade diameters of the second saw blade.

The wall saw is either positioned in a resumption position, which corresponds to the parking position, or the actual second saw blade diameter of the second saw blade is entered and used to calculate a resumption position before the controlled machining is resumed. In the resumption position, the pivot axis is at a distance from the second end point of D _real .2 / 2 for -180 ° ≤ -α ₂ ≤ 0 °, D _real .2 / 2 + δ · sin (α ₂ ) for 0 ° <α ₂ ≤ 90 ° and D _real .2 / 2 + δ · sin (90 °) for 90 ° <α ₂ ≤ 180 °.

In the third embodiment, a first blade guard with a first blade guard width is specified for the first saw blade before the start of the controlled processing, the first blade guard width being composed of a first distance between the axis of rotation and the first blade guard edge and a second distance between the axis of rotation and the second blade guard edge and the second distance is also used to calculate the fourth parking position. When machining with the first blade guard, the fourth parking position depends on the first and second main cutting angle. For the main cutting angles, there are three angle ranges from -180 ° to 0 °, 0 ° to 90 ° and 90 ° to 180 °, so that a total of nine different distances result for the fourth parking position.

In the first angular range, the saw arm is arranged at a negative first main cutting angle between -180 ° and 0 before the interruption of the controlled processing and the pivot axis has a distance to the second end point of maximum value of [B _b in the fourth parking position _. 1 + Δ _assembly , D _2/2 + Δ _assembly ] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b. 1 + Δ _Montage , D _2/2 + Δ _Montage , D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _Montage , D ₂ / 2 + Δ _Montage , D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In the second angular range the saw arm is arranged at a positive first main cutting angle between 0 ° and 90 ° before the interruption of the controlled machining and the pivot axis has a distance to the second end point of maximum value of [B _b .1 + Δ _Montage , D in the fourth parking position _2/2 + Δ _mounting, B _b .1 + δ · sin (α _1)] to -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _assembly , B _b .1 + δ · sin (α ₁ ), D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _Montage , D ₂ / 2 + Δ _Montage , B _b .1 + δ · sin (α ₁ ), D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In the third angular range the saw arm is arranged at a positive first main cutting angle between 90 ° and 180 ° before the interruption of the controlled processing and the pivot axis has a distance to the second end point of maximum value of [B _b .1 + Δ _Montage , D in the fourth parking position _2/2 + Δ _mounting, B _b .1 + δ · sin (90 °)] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _assembly , B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _Montage , D ₂ / 2 + Δ _Montage , B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

After the controlled machining has been resumed, the wall saw is positioned in a resumption position which corresponds to the fourth parking position. In the resumption position, the saw arm is swiveled into the second main cutting angle and the saw head is then moved in a negative feed direction opposite to the positive feed direction towards the first end point.

In the fourth embodiment, a second blade guard with a second blade guard width is defined for the second saw blade before the start of the controlled processing, the second blade guard width being composed of a first distance between the axis of rotation and the first blade guard edge and a second distance between the axis of rotation and the second blade guard edge and the second distance is also used to calculate the fifth parking position. When machining with the first and second blade protection, the fifth parking position depends on the first and second main cutting angle. A distinction is made between three angle ranges, negative main cutting angles, positive main cutting angles from 0 ° to 90 ° and positive main cutting angles from 90 ° to 180 °, so that a total of nine different distances result for the fifth parking position.

In the first angular range the saw arm is arranged at a negative first main cutting angle between -180 ° and 0 ° before the interruption of the controlled processing and the pivot axis has a distance to the second end point of maximum value of [B _b .1 + Δ _assembly , in the fifth parking position, B _b .2 + Δ _Montage ] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In the second angular range, the saw arm is arranged at a positive first main cutting angle between 0 ° and 90 ° before the interruption of the controlled machining and the pivot axis has a distance to the second end point of maximum value of [B _b in the fifth parking position _. 1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (α ₁ )] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b. 1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value from [B _b. 1 + Δ _Montage , B _b .2 + Δ _Momage , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In the third angular range the saw arm is arranged at a positive first main cutting angle between 90 ° and 180 ° before the interruption of the controlled machining and the pivot axis has a distance to the second end point of maximum value of [B _b in the fifth parking position _. 1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (90 °)] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b. 1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

After the controlled machining has been resumed, the wall saw is positioned in a resumption position which corresponds to the fifth parking position. In the resumption position, the saw arm is swiveled into the second main cutting angle and the saw head is then moved in a negative feed direction opposite to the positive feed direction towards the first end point.

Embodiments

Embodiments of the invention are described below with reference to the drawing. This should not necessarily represent the exemplary embodiments to scale, rather, the drawing, where useful for explanation, is in a schematic and / or slightly distorted form. With regard to additions to the teachings that can be seen directly from the drawing, reference is made to the relevant prior art. It must be taken into account here that various modifications and changes relating to the shape and detail of an embodiment can be made without deviating from the general idea of the invention. The features of the invention disclosed in the description, the drawing and the claims can be essential for the development of the invention both individually and in any combination. In addition, all combinations of at least two of the features disclosed in the description, the drawing and / or the claims fall within the scope of the invention. The general idea of the invention is not restricted to the exact form or the detail of the preferred embodiment shown and described below or restricted to an object that would be restricted in comparison to the object claimed in the claims. Given the measurement ranges, values lying within the stated limits should also be disclosed as limit values and be able to be used and claimed as required. For the sake of simplicity, the same reference symbols are used below for identical or similar parts or parts with identical or similar functions.

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-H

das Wandsägesystem der FIG. 1 bei Erstellen eines Trennschnittes zwischen einem ersten Endpunkt, der ein Hindernis darstellt, und einem zweiten freien Endpunkt ohne Hindernis; und

FIGN. 6A, B

das Wandsägesystem der FIG. 1 beim Erstellen eines weiteren Trennschnittes zwischen einem ersten freien Endpunkt ohne Hindernis und einem zweiten Endpunkt, der ein Hindernis darstellt.

Show it:

FIG. 1

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

FIGN. 2A, B

the machining of a separating cut between a first and second free end point without an obstacle;

FIGN. 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;

FIGN. 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;

FIGN. 5A-H

the wall saw system of FIG. 1 when creating a separating cut between a first end point, which represents an obstacle, and a second free end point without an obstacle; and

FIGN. 6A, B

the wall saw system of FIG. 1 when creating another separating cut between a first free end point without an obstacle and a second end point that represents an obstacle.

FIG. 1 shows a wall saw 10 with a guide rail 11, arranged a displaceable 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 comprises a machining tool 16 in the form of a saw blade , which is attached to a saw arm 17 and is driven by a drive motor 18 about an axis of rotation 19 .

To protect the operator, the saw blade 16 is surrounded by a blade guard 21 which is fixed by a blade guard holder on the saw arm 17th The saw arm 17 is designed to be pivotable about a pivot axis 23 by a pivot motor 22 . The pivot 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 swivel motor 22 are arranged in a device housing 25 . The motorized feed unit 15 comprises a guide carriage 26 and a feed motor 27, which in the exemplary embodiment is also arranged in the device housing 25. The saw head 14 is fastened to the guide carriage 26 and is designed to be displaceable along the guide rail 11 in a feed direction 28 via the feed motor 27. In addition to the motors 19, 22, 27, a control unit 29 for controlling the saw head 14 and the motorized feed unit 15 is arranged in the device housing 25.

A sensor device with several sensor elements is provided to monitor the wall saw system 10 and the machining process. 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 inside the device housing 35. The control unit 38 converts the inputs from 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 . In the exemplary embodiment, the wireless and wireless communication link is designed as a radio link 41, which is created between a first radio unit 43 on the remote control 13 and a second radio unit 44 on the tool device 12. Alternatively, the wireless and wireless Communication connection 41 be in the form of an infrared, Bluetooth, WLAN or Wi-Fi connection.

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

The end point of a severance cut can be defined as a free end point without an obstacle or as an obstacle. Both end points can be defined as free end points without an obstacle, both end points as an obstacle or one end point as a free end point and the other end point as an obstacle. Overlapping may be permitted at a free end point without an obstacle. As a result of the overlapping, the cutting depth at the end point reaches the final depth T of the separating cut. In the embodiment of FIGN. 2A , B, the end points E _1, E _{2 form} free end points without an obstacle, an overlap being not permitted at the free first end point E _{1 and} an overlap taking place at the second end point E ₂ .

FIG. 2A shows the saw head 14 in an assembly position X ₀ and the saw arm 17 in a basic position of 0 °. The operator positions the saw head 14 in the assembly position X ₀ on the guide rail 11 by means of the guide carriage 26. The assembly position X _{0 of} the saw head 14 lies between the first and second end points 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 monitoring the position of the saw head 14 and controlling the wall saw 12, since the X position of the pivot axis 23 remains unchanged even during the pivoting movement of the saw arm 17. Alternatively, a different X position on the saw head 14 can be defined as the reference position, in which case the distance in the X direction to the pivot axis 23 must also be known.

The X positions of the first and second end points E _1, E ₂ are defined in the exemplary embodiment by entering partial lengths. The distance between the mounting position X ₀ and the first end point E ₁ determines a first partial length L ₁ and the distance between the mounting position X ₀ and the second end point E _{2 determines} a second partial 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 made in several partial cuts until the desired final depth T is reached. The partial cuts between the first and second end points E ₁ , E ₂ are defined as main cuts and the cutting sequence of the main cuts as the main cutting sequence. Additional corner machining can be carried out at the end points of the separating cut, which is referred to as obstacle machining in the case of an obstacle and as overcut machining in the case of a free end point with overlapping.

The main cutting sequence can be determined by the operator or the control unit of the wall saw system determines the main cutting sequence depending on several boundary conditions. The first main cut, which is also referred to as the preliminary cut, is usually carried out with a reduced cutting depth and a reduced power of the drive motor in order to prevent the saw blade from being polished. The other main cuts are usually made with the same cutting depth, but can also have different cutting depths. The boundary conditions that are usually set by an operator include the cutting depth of the preliminary cut, the performance of the preliminary cut and the maximum cutting depth of the further main cuts. The control unit can determine the main cutting sequence from these boundary conditions.

The main cuts of a severing cut are made with one saw blade diameter or with two or more saw blade diameters. If several saw blades are used, processing usually starts with the smallest saw blade diameter. In order to be able to mount the saw blade 16 on the saw arm 17, the saw blade 16 must be arranged above the workpiece 24 in the basic position of the saw arm 17. Whether this boundary condition is met depends on two device-specific parameters of the wall saw system 10, on the one hand on a vertical distance Δ between the pivot axis 23 of the saw arm 17 and an upper side 53 of the workpiece 24 and on the other hand on a saw arm length δ of the saw arm 17, which is used as 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 variables is greater than half the saw blade diameter D / 2, the saw blade 16 is arranged above the workpiece 24 in the basic position. The saw arm length δ is a fixed device-specific variable of the wall saw 12, whereas the vertical distance Δ between the pivot axis 23 and the surface 53 depends not only on the geometry of the wall saw 12 but also on the geometry of the guide rail 11 used.

The saw blade 16 is attached to a flange on the saw arm 17 and is driven by the drive motor 18 about the axis of rotation 19 when the saw is in operation. In the basic position of the saw arm 17, which is shown in FIG. 2A is shown, the pivot angle is 0 ° and the axis of rotation 19 of the saw blade 16 lies above the pivot axis 23. The saw blade 16 is moved into the workpiece 24 from the basic position at 0 ° by a pivoting movement of the saw arm 17 about the pivot axis 23. 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 a blade guard 21 or without a blade guard 21. In order to process the separating cut in the area of the end points E ₁ , E ₂ , the blade guard 21 can for example be dismantled. If different saw blade diameters are used to process the separating cut, different blade guards with corresponding blade guard widths are usually used.

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

With a pivot angle of ± 180 °, the maximum depth of penetration of the saw blade 16 into the workpiece 24 is reached. The pivoting movement of the saw arm 17 about the pivot axis 23 shifts the position of the axis of rotation 19 in the X direction and in the Y direction. The displacement of the axis of rotation 19 is dependent on the saw arm length δ and the pivot angle α of the saw arm 17. The displacement path δ _x in the X direction is δ sin (± α) and the displacement path δ _y in the Y direction is δ · cos (± α).

The saw blade 16 generates a cutting wedge in the workpiece 24 in the form of a circular segment with a height h and a width b. The height h of the circular segment corresponds to the depth of penetration of the saw blade 16 into the workpiece 24. The relationship D / 2 = h + Δ + δ · cos (α) applies to the depth of penetration h, where D is the saw blade diameter, h is the penetration depth of the saw blade 16, Δ denotes the vertical 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 the relationship b ² = D / 2 · 8h - 4h ² = 4Dh - 4h ² applies to the width b = 4h * (D - h), where h denotes the depth of penetration of the saw blade 16 into the workpiece 24 and D denotes 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, in the case of an obstacle, on whether the processing is carried out with blade guard 21 or without blade guard 21. With a free end point without an obstacle, the wall saw 12 is controlled in the method according to the invention via upper exit points of the saw blade 16 on the upper side 53 of the workpiece 24. The upper exit points of the saw blade 16 can be moved from the reference position X _{Ref of} the pivot axis 23 in the X direction, calculate the displacement path δ _{x of} the axis of rotation 19 in the X direction and the width b. An upper exit point facing the first end point E ₁ is referred to as the first upper exit point 58 and an upper exit point facing the second end point E _{2 is} referred to as the 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 applies X (59) = X _Ref + δ _x + b / 2 with b / 2 = √ [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 wall saw 12 is controlled in the method according to the invention via the reference position X _{Ref of} the pivot axis 23 and the limitation of the wall saw 12. A distinction is made between machining without blade guard 21 and machining with blade guard 21.

FIGN. 3A , B show the wall saw system 10 making a separating cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, the processing being carried out without a blade guard 21. When machining without a 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 axis of rotation 19 and the saw blade diameter D. FIG. 3A shows the wall saw 12 with the saw arm 17 inclined in the negative direction of rotation 54 at a negative pivot angle -α (0 ° to -180 °). 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 saw arm 17 inclined in the positive direction of rotation 55 at a positive pivot angle α (0 ° to + 180 °). For the first saw blade edge 61, X (61) = X _Ref + δ · sin (α) - D / 2 and for the second saw blade edge 62 applies X (62) = X _Ref + δ · sin (α) + D / 2.

FIGN. 4A , B show the wall saw system 10 making a separating cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, the processing being carried out with a blade guard 21. When machining without blade protection 21, 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 , form the boundary of the wall saw 12.

The X positions of the first and second blade guard edge 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 axis of rotation 19 and the blade guard width B. FIG. 4A shows the wall saw 12 with the saw arm 17 inclined at a negative swivel angle -α (0 ° to -180 °) and the mounted blade guard 21 of blade guard width B. With an asymmetrical blade guard, the distances between the axis of rotation 19 to the sheet protection edges 71, 72, the distance to the first sheet protection edge 71 being referred to as the first distance B _a and the distance to the second sheet protection edge 72 being referred to as the second distance B _b .

For the first protective sheet edge 71, X (71) = X _Ref + δ · sin (-α) - B _a, and for the second protective sheet edge 72, X (72) = X _Ref + δ · sin (-α) + B _b . FIG. 4B shows the wall saw 12 with the saw arm 17 inclined at a positive pivot angle α (0 ° to + 180 °) and the mounted blade guard 21 of blade guard width B. For the first blade guard edge 71, X (71) = X _Ref + δ sin (α) - B _a and for the second protective blade edge 72, X (72) = X _Ref + δ · sin (α) + B _b applies. FIGN. 2A , B show a separating section between two end points E ₁ , E ₂ , which are defined as free end points without an obstacle, and FIGN. 3A , B and 4A, B show a separating section between two end points E ₁ , E ₂ , which are defined as obstacles. In practice, separating 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 an obstacle, with the wall saw being controlled via the upper exit point of the saw blade at the free end point and via the saw blade edge for the obstacle (machining without sheet protection 21) or the sheet protection edge (processing with sheet protection 21).

The first upper exit point 58, the first saw blade edge 61 and the first blade protection edge 71 are summarized 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 protection edge 72 are summarized under the term "second Limitation "summarized.

FIGN. 5A-H show the wall saw system 10 of FIG. 1 with the guide rail 11 and the wall saw 12 when creating a separating cut of the final depth T in the workpiece 24 between a first end point E ₁ , which represents an obstacle, and a second end point E ₂ , which represents a free end point without an obstacle.

The cut is machined with the aid of the method according to the invention for controlling a wall saw system. The separating cut is made in a main cut sequence of several main cuts until the desired final depth T is reached. The main cutting sequence comprises a preliminary cut (zeroth main cut) with a zeroth main cutting angle α _{0 of} the saw arm 17, a zeroth diameter D ₀ and a zeroth penetration depth h _{0 of} the saw blade used, a first main cut 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 cut 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 cut with a third main cutting angle α ₃ des Saw arm 17, a third diameter D ₃ and a third penetration depth h _{3 of} the saw blade used.

The preliminary cut and the first main cut are made by a first saw blade 16.1 with a first saw blade diameter D.1 and a first blade guard 21.1 with a first blade guard width B.1 . The zeroth diameter D _{0 of} the preliminary cut and the first diameter D _{1 of} the first main cut correspond to the first saw blade diameter D.1, and the zeroth width B _{0 of} the preliminary cut and the first width B _{1 of} the first main cut with the first blade guard width B. 1 match. The second main cut and the third main cut are performed by a second saw blade 16.2 with a second saw blade diameter D.2 and a second blade guard 21.2 with a second blade guard width B.2 . The second diameter D _{2 of} the second main cut and the third diameter D _{3 of} the third main cut match the second saw blade diameter D.2, and the second width B _{2 of} the second main cut and the third width B ₃ of the third main cut match the second blade guard width B.2 match.

The main cuts of a severing cut are advantageously carried out either with a pulling saw arm 17 or the saw arm 17 is arranged alternately pulling and pushing. The pulling arrangement of the saw arm 17 enables stable guidance of the saw blade during processing and a narrow cutting gap. A separating cut in which the saw arm 17 is arranged alternately pulling and pushing has the advantage that the non-productive times required for positioning the saw head 14 and pivoting the saw arm 17 are reduced.

In the embodiment of FIGN. 5A-H machining is carried out in all main cuts with the pulling saw arm 17. The machining of the separating cut begins at the second end point E ₂ . After the start of the method according to the invention, the saw head 14 is positioned in a starting position X _Start in which the pivot axis 23 is at a distance of √ [h ₀ · (D ₀ - h ₀ )] - δ · sin (α ₀ ) from the second end point E. having ₂ where h ₀ = h (α _0, D ₀₎ = D _0/2 - Δ - δ · cos (α _0), the depth of penetration of the saw blade into the workpiece 24 in the zeroth main cutting angle α ₀ with the zeroth diameter D _0, which corresponds to the first saw blade diameter D.1. In the starting position, the saw arm 17 is pivoted from the basic position 0 ° in the positive direction of rotation 55 into the positive zeroth main cutting angle α ₀ . The saw head 14 with the inclined saw arm 17 and the rotating first saw blade 16.1 is then moved in the negative feed direction 57.

Since the first blade guard 21.1 is mounted, the wall saw 12 is controlled at the first end point E ₁ via the first blade guard edge 71.1 of the first blade guard 21.1. The saw head 14 is stopped, if the pivot axis B at a distance of _1/2 23 - has δ · sin (-α ₁₎ to the first end point e. ₁ The first width B ₁ of the blade guard used corresponds to the first blade guard width B.1 of the first blade guard 21.1. The saw arm 17 is then pivoted in the negative direction of rotation 54 into the negative first main cutting angle -α ₁ and the saw head 14 with the saw arm 17 inclined at -α _{1 is} moved in the positive feed direction 56 ( FIG. 5A ). In the exemplary embodiment, the transition from the preliminary cut to the first partial cut has taken place without removing the residual material. Alternatively, the preliminary cut can be ended with a complete removal of the remaining material during the preliminary cut or a partial removal.

The saw head 14 is moved in the positive feed direction 56 until the pivot axis 23 is at 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 16.1 into the workpiece 24 at negative first main cutting angle -α ₁ having the first diameter D _1, which corresponds to the first saw blade diameter D.1. The saw arm 17 is then pivoted in the positive direction of rotation 55 into the positive first main cutting angle α ₁ and the remaining material is removed.

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 swiveled out of the workpiece 24, the saw arm 17 in the exemplary embodiment being swiveled into the basic position of 0 ° ( FIG. 5B ). The positioning of the saw head 14 in the parking position and the pivoting movement of the saw arm 17 can be carried out one after the other or carried out simultaneously.

The park position should meet various boundary conditions: The first saw blade 16.1 and the first blade guard 21.1 can be removed in the park position. The second saw blade 16.2 and the second blade guard 21.2 can be mounted in the parking position. In addition, the travel for positioning the saw head 14 for the second main cut should be as short as possible; in the ideal case, the parking position corresponds to the starting position for the second main cut.

Since the second end point E _{2 represents} a free end point without an obstacle, the dismantling 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. At the in FIG. 5C the parking position shown, the pivot axis 23 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 ) denotes the depth of penetration of the second saw blade 16.2 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.

After the assembly of the second saw blade 16.2 and the second blade guard 21.2 and the resumption of the controlled machining, the wall saw 12 is positioned by the control unit 29 in a resumption position which corresponds to the parking position. The distance was set in the calculation of the parking position so that, the second end point E ₂ facing, second upper exit point 59.2 of the second saw blade 16.2 after the pivotal movement of the saw arm α 17 in the positive second main cutting angle ₂ with the second end point E ₂ coincides ( FIG. 5C ). This positioning can reduce idle times.

In the resumption position, the saw arm 17 is pivoted in the positive direction of rotation 55 into the positive second main cutting angle α ₂ . The saw head 14 is moved in the negative feed direction 57 with the saw arm 17 inclined at the second main cutting angle α ₂ and the rotating second saw blade 16.2. The transition from the second main cut to the third main cut takes place analogously to the transition from the preliminary cut to the first main cut with complete removal of the remaining material ( FIG. 5E ) or alternatively with a partial removal of the residual material or without removal of the residual material. The wall saw is controlled by means of the first blade guard edge 71.2 of the second blade guard 21.2.

In practice, when cutting through a workpiece, the last main cut is made with the maximum pivoting angle of the saw arm in order to remove as much material as possible in the area of the end points. Without limitation of the maximum allowed The depth of cut corresponds to the maximum swivel angle ± 180 ° and, with restrictions, the maximum permissible cutting depth for the saw blade used can be converted into a maximum swivel angle. In the exemplary embodiment, the third main cut corresponds to the last main cut and is carried out with a third main cut angle of -180 °. The positioning of the saw head 14 for the third main cut with the maximum swivel angle of -180 ° takes place by means of the critical angle α _crit of -90 °. The critical angle of -90 ° must be taken into account, since the first end point E ₁ must not be exceeded during the pivoting movement. 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 at the critical angle α _crit of -90 °. Then the saw arm 17 is swiveled into the negative third main cutting angle of - 180 ° ( FIG. 5E ).

Since the third main section represents the last main section of the main section sequence, a corner machining of the first end point E ₁ takes place before the machining of the last main section. For this purpose, the saw head 14 with the saw arm 17 inclined at -180 ° ( FIG. 5F ) move 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 removed and the corner processing is carried out without a blade guard. Without a blade guard, the saw head 14 with the saw arm 17 inclined at -180 ° is moved in the negative feed direction 57 until the first saw blade edge 61.2 of the second saw blade 16.2 coincides with the first end point E ₁ .

After the corner machining of the first end point E ₁ , the third main cut is performed with the saw arm 17 inclined at the negative third main cutting angle -α ₃ in the positive feed direction 56. The feed movement of the saw head 14 is stopped when the pivot axis 23 has a distance of √ [h ₃ · (D ₃ - h ₃ )] + δ · sin (180 °) = √ [h ₃ · (D ₃ - h ₃ )] having the second end point e _2, where h ₃ = h (-α _2, D ₃₎ = D _2/2 - δ - δ · cos (-180 °) = D _2/2 - δ + δ, the penetration depth of the saw blade in the workpiece 24 at the negative third main cutting angle -α ₃ with the third diameter D ₃ , which corresponds to the second saw blade diameter D.2. If the second end point E _2, an overcut is allowed is based on the third main cutting a corner processing of the second end point E ₂ ( FIG. 5H ). The in FIGN. 5A-H The separating cut shown, the pivoting movement of the saw arm 17 takes place in a new main cutting angle in each case in a pivoting movement. In the case of hard materials or less powerful drive motors 18 for the saw blade 16, it can be advantageous to perform the pivoting movement of the saw arm 17 in at least two steps with an intermediate angle perform, the saw blade 16 being cut free between the pivoting movements in the intermediate angles.

FIGN. 6A , B show the wall saw system 10 with the guide rail 11 and the wall saw 12 making a further separating cut between a first end point E ₁ , which represents a free end point without an obstacle, and a second end point E ₂ , which represents an obstacle. The wall saw 12 is controlled at the first end point E ₁ via the first upper exit point 59 of the saw blade used and at the second end point E ₂ via the first saw blade edge 61 (without blade guard 21) or the first blade guard edge 71 (with blade guard 21).

The cutting sequence comprises a first main cut 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, as well as a following second main cut 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.

The first main cut is made by the first saw blade 16.1 and the first blade guard 21.1 and the second main cut is made by the second saw blade 16.2 and the second blade guard 21.2. The first diameter D ₁ and the first width B _{1 of} the first main cut correspond to the first saw blade diameter D.1 and the first blade guard width B.1. The second diameter D ₂ and the second width B _{2 of} the second main cut correspond to the second saw blade diameter D.2 and the second blade guard width B.2.

• ▪ Demontieren des ersten Sägeblattes 16.1 und ersten Blattschutzes 21.1,
• ▪ Montieren des zweiten Sägeblattes 16.2 und zweiten Blattschutzes 21.2 Ausschwenken des Sägearms 17 mit dem ersten Sägeblatt 16.1 aus dem ersten Hauptschnittwinkel α₁ in die Grundposition bei 0° und
• ▪ Einschwenken des Sägearms 17 mit dem zweiten Sägeblatt 16.2 aus der Grundposition bei 0° in den zweiten Hauptschnittwinkel α₂.

The boundary conditions apply to the parking position:

• ▪ Dismantling the first saw blade 16.1 and first blade guard 21.1,
• ▪ Assemble the second saw blade 16.2 and second blade guard 21.2. Swiveling out the saw arm 17 with the first saw blade 16.1 from the first main cutting angle α ₁ into the basic position at 0 ° and
• ▪ Swiveling the saw arm 17 with the second saw blade 16.2 from the basic position at 0 ° into the second main cutting angle α ₂ .

The dismantling 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 take place in the basic position of the saw arm 17 at 0 °. If the second end point E ₂ , as in the exemplary embodiment, represents an obstacle, a mounting distance Δ _{mounting is} additionally established before the start of the controlled processing. The mounting distance Δ _mounting ensures that between the There is sufficient distance between the obstacle and the saw blade or between the obstacle and the blade guard for the operator to grip the saw blade or the blade guard; a suitable mounting distance is, for example, 10 cm.

When machining with blade protection, a minimum distance to the second end point (E ₂ ) of B _b .1 + Δ _assembly for the first blade protection 21.1 and B _b .2 + Δ _assembly for the second blade protection 21.2 is required. Since the first blade guard width B.1 is smaller than the second blade guard width B.2, it is sufficient for symmetrical blade guards to take the second blade guard width B.2 into account when calculating the minimum distance for mounting; for asymmetrical blade guards, both minimum distances must be taken into account. The pivot axis 23 must have a distance of maximum value of [B _b .1 + Δ _Montage, B _b .2 + Δ _Montage ] to the obstacle at E ₂ ( FIG. 6A ).

The necessary distances for swiveling out the first saw blade 16.1 and for swiveling in the second saw blade 16.2 at the second end point E ₂ depend on the first main cutting angle α _{1 of} the first main cut and on the second main cutting angle α _{2 of} the second main cut. A distinction must be made between negative main cutting angles from -180 ° to 0 °, positive main cutting angles α from 0 ° to 90 ° and positive main cutting angles α from 90 ° to 180 °. For positive main cutting angles α of 90 ° to 180 °, the critical angle α _crit of ± 90 ° must be taken into account, since the obstacle at the second end point E ₂ must not be exceeded during the swivel movement. At the critical angle α _crit of + 90 °, the pivot axis 23 has a distance from the second end point E ₂ of B _b .1 + δ · sin (90 °) = B _b .1 + δ for the first blade guard 21.1 and from B _b . 2 + δ sin (90 °) = B _b .2 + δ for the second blade guard 21.2 on ( FIG. 6B ).

In the case of negative first main cutting angles -α ₁ of -180 ° to 0 °, the first saw blade 16.1 is pivoted out into the basic position at 0 ° on the side facing away from the second end point E ₂ and the displacement path is negative. For negative second main cutting angles -α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 °, different distances result.

In the case of negative second main cutting angles -α ₂ , the second saw blade 16.2 is swiveled in on the side facing away from the second end point E ₂ and the distance required for swiveling in is smaller than the minimum distance for assembly; the control unit 29 selects the maximum value of [B _b .1 + Δ _assembly , B _b .2 + Δ _assembly ] as the parking position for the wall saw 12. With positive second main cutting angles α ₂ between 0 ° and 90 °, a distance between the pivot axis 23 and the obstacle at E ₂ of B _b .2 + δ · sin (α ₂ ) is required to pivot the second saw blade 16.2 and the control unit 29 selects the parking position For the wall saw 12 the maximum value of [B _b .1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 °. With a positive second main cutting angle α ₂ between 90 ° and 180 °, the distance between the pivot axis 23 and the obstacle B _b .2 + δ sin (90 °) = B _b .2 + δ required for pivoting the second saw blade 16.2 and the control unit 29 selects as the parking position for the wall saw 12, the maximum value of [B _b .1 + Δ _assembly, B _b .2 + Δ _assembly , B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

If the first main cutting angle α _{1 is} positive from 0 ° to 90 °, the first saw blade 16.1 is pivoted out into the basic position on the side facing the second end point E ₂ . To pivot the first saw blade 16.1, a distance between the pivot axis 23 of B _b .1 + δ · sin (α ₁ ) from the obstacle is required. For negative second main cutting angles - α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 ° there are different distances.

In the case of negative second main cutting angles α ₂ , the second saw blade 16.2 is swiveled in on the opposite side of the obstacle and the control unit 29 selects the maximum value of [B _b .1 + Δ _assembly , B _b .2 + Δ _assembly , as the parking position for the wall saw 12, B _b .1 + δ · sin (α ₁ )]. With positive second main cutting angles α ₂ from 0 ° to 90 °, a distance of the pivot axis 23 of B _b .2 + δ · sin (α ₂ ) to the obstacle is required for pivoting the second saw blade 16.2 and the control unit 29 selects the parking position for the wall saw 12 the maximum value of [B _b. 1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (a ₂ )]. With positive second main cutting angles α ₂ of 90 ° to 180 °, a distance between the pivot axis 23 of B _b .2 + δ · sin (90 °) = B _b .2 + δ to the obstacle is required for pivoting the second saw blade 16.2, and the control unit 29 selects as the parking position for the wall saw 12 the maximum value of [B _b. 1 + Δ _assembly , B _b .2 + Δ _assembly , B _b .2 + δ sin (90 °)].

With a positive first main cutting angle α ₁ of 90 ° to 180 °, the first saw blade 16.1 is pivoted out into the basic position on the side facing the second end point E ₂ ; To pivot the first saw blade 16.1, a distance between the pivot axis 23 of B _b .1 + δ · sin (90 °) = B _b .1 + δ from the obstacle at E _{2 is} required. For negative second main cutting angles -α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 °, different distances result.

In the case of negative second main cutting angles α ₂ , the second saw blade 16.2 is swiveled in on the side facing away from the obstacle and the control unit 29 selects the maximum value of [B _b .1 + Δ _assembly , B _b .2 + Δ _assembly , as the parking position for the wall saw 12, B _b .1 + δ · sin (90 °)]. In the case of positive second main cutting angles α ₂ from 0 ° to 90 °, pivoting is required of the second saw blade 16.2 a distance of the pivot axis 23 of B _b .2 + δ · sin (α ₂ ) to the obstacle is required and the control unit 29 selects the maximum value of [B _b .1 + Δ _assembly , B _b as the parking position for the wall saw 12 .2 + Δ _assembly , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (α ₂ )]. With positive second main cutting angles α ₂ of 90 ° to 180 °, a distance between the pivot axis 23 of B _b .2 + δ · sin (90 °) = B _b .2 + δ to the obstacle is required for pivoting the second saw blade 16.2, and the control unit 29 selects as the parking position for the wall saw 12 the maximum value of [B _b .1 + Δ _Montage , B _b .2 + Δ _Montage , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin ( 90 °)].

If the machining of the first and / or second partial cut is carried out without a blade guard, the second saw blade edge 62 is used instead of the second blade guard edge 72 to calculate the minimum distances for the parking position and the second blade guard width B.2 becomes the saw blade diameter D.2 of the second saw blade 16.2 replaced.

The in FIGN. 5A-H and FIGN. 6A , B, the pivoting movement of the saw arm 17 into the main cutting angles takes place in a pivoting movement. In the case of hard materials or less powerful drive motors 18 for the saw blade, it can be advantageous to carry out the pivoting movement of the saw arm 17 in at least two steps with an intermediate angle, the saw blade being cut free between the pivoting movements into the intermediate angles.

Claims (27)

1. Method for controlling a wall saw system (10) comprising a guide rail (11) and a wall saw (12) having a saw head (14), a motorized feed unit (15) which displaces the saw head (14) parallel to a feed direction (28) along the guide rail (11), a first saw blade (16.1) and a larger, second saw blade (16.2) when creating a separating cut (51) of end depth (T) in a workpiece (24) of workpiece thickness (d) between a first end point (E₁) and a second end point (E₂), wherein the first or second saw blade (16.1, 16.2) is fastened to a saw arm (17) of the saw head (14) and is driven about an axis of rotation (19), the saw arm (17) being pivotable about a pivot axis (23), comprising:

   ▪ before the start of a machining of the separating cut (51) that is controlled by a control unit (29) of the wall saw (12), at least the first saw blade diameter (D.1) of the first saw blade (16.1), the second saw blade diameter (D.2) of the second saw blade (16.2), the positions of the first and second end point (E₁, E₂) in the feed direction (28), the end depth (T) of the separating cut (51) and a main-cut sequence of m main cuts, m ≥ 2, are determined, wherein the main-cut sequence comprises at least a first main cut with a first main-cut angle (α₁) of the saw arm (17) and a first diameter (D₁) of the saw blade used during the first main cut and a following second main cut with a second main-cut angle (α₂) of the saw arm (17) and a second diameter (D₂) of the saw blade used during the second main cut,

   ▪ during the machining controlled by the control unit (29),

   - the saw arm (17) with the first saw blade (16.1) is arranged in a positive direction of rotation (55) at the positive first main-cut angle (+α₁) or in a negative direction of rotation (54) directed opposite to the positive direction of rotation (55) at the negative first main-cut angle (-α₁), and

   - the saw head (14) is moved in a positive feed direction (56) in the direction of the second end point (E₂),

   wherein, after the machining of the separating cut (51) with the first saw blade (16.1), the controlled machining of the separating cut is interrupted by the control unit (29) and the wall saw (12) is moved by the control unit (29) into a park position,
   characterized in that, before the start of the machining controlled by the control unit (29), in addition a saw arm length (δ) of the saw arm (17), which is defined as a distance between the pivot axis (23) of the saw arm (17) and the axis of rotation (19) of the first or second saw blade (16.1, 16.2), and a distance (Δ) between the pivot axis (23) and an upper side (53) of the workpiece (24) are determined.
2. Method according to Claim 1, characterized in that, after the change from the first saw blade (16.1) to the second saw blade (16.2) and the resumption of the controlled machining, the wall saw (12) is positioned by the control unit (29) into a resumption position.
3. Method according to Claim 2, characterized in that the second end point (E₂) constitutes a free end point without obstacle and the second saw blade diameter (D.2), set before the start, of the second saw blade (16.2) is used for the calculation of a first park position and a resumption position which corresponds to the first park position.
4. Method according to Claim 3, characterized in that the pivot axis (23) in the first park position has a distance from the second end point (E₂) of √[h₂ · (D.2 - h₂)] + δ·sin(±α₂), where h₂ = h(±α₂, D.2) = D.2/2 - Δ - δ·cos(±α₂) denotes the penetration depth of the used second saw blade (16.2) into the workpiece (24) at the second main-cut angle (±α₂) with the preset second saw blade diameter (D.2).
5. Method according to Claim 2, characterized in that the second end point (E₂) constitutes a free end point without obstacle and the second saw blade diameter of the second saw blade (16.2) can be set between a maximum second saw blade diameter (D_max.2) and a minimum second saw blade diameter (D_min.2), wherein the maximum second saw blade diameter (D_max.2) is used for the calculation of a second park position.
6. Method according to Claim 5, characterized in that the pivot axis (23) in the second park position has a distance from the second end point (E₂) of √[h_2,max · (D_max.2 - h₂,_max)] + δ·sin(±α₂), where h_2,max = h(±α₂, D_max.2) = D_max.2/2 - Δ - δ·cos(±α₂) denotes the maximum penetration depth of the second saw blade (16.2) into the workpiece (24) at the second main-cut angle (±α₂) with the maximum second saw blade diameter (D_max.2).
7. Method according to Claim 6, characterized in that, after the resumption of the controlled machining, the wall saw (12) is positioned into a resumption position which corresponds to the second park position.
8. Method according to Claim 6, characterized in that, before the resumption of the controlled machining, the actual second saw blade diameter (D_real.2) of the second saw blade (16.2) is input and used for the calculation of a resumption position.
9. Method according to Claim 8, characterized in that the pivot axis (23) in the resumption position has a distance from the second end point (E₂) of √[h_2·(D_real.2/2 - h₂)] + δ·sin(±α₂), where h₂ = h(±α₂, D_real.2) = D_real.2/2 - Δ - δ·cos(±α₂) denotes the penetration depth of the second saw blade (16.2) into the workpiece (24) at the second main-cut angle (±α₂) with the actual second saw blade diameter (D_real.2).
10. Method according to either of Claims 1 and 2, characterized in that the second end point (E₂) is defined as an obstacle and, before the start of the controlled machining, a mounting distance (Δ_mounting) is additionally determined, wherein the mounting distance (Δ_mounting) is additionally used for the calculation of a third to fifth park position.
11. Method according to Claim 10, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a negative first main-cut angle (-α₁) between -180° and 0°, and the pivot axis (23) in the third park position has a distance from the second end point (E₂) of a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting] for -180° ≤ -α₂ ≤ 0°, a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
12. Method according to Claim 10, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 0° and 90°, and the pivot axis (23) in the third park position has a distance from the second end point (E₂) of a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₁/2 + δ·sin(α₁)] for -180° ≤ -α₂ ≤ 0°, a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₁/2 + δ·sin(α₁), D₂/2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
13. Method according to Claim 10, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 90° and 180°, and the pivot axis (23) in the third park position has a distance from the second end point (E₂) of a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₁/2 + δ·sin(90°)] for -180° ≤ -α₂ ≤ 0° and a maximum value of [D₁/2 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
14. Method according to one of Claims 11 to 13, characterized in that, for calculating the third park position, the preset first saw blade diameter (D.1) of the first saw blade (16.1) is used for the first diameter (D₁) of the first main cut, and the preset second saw blade diameter (D.2) of the second saw blade (16.2) is used for the second diameter (D₂) of the second main cut.
15. Method according to Claim 14, characterized in that, after the resumption of the controlled machining, the wall saw (12) is positioned by the control unit (29) into a resumption position which corresponds to the third park position.
16. Method according to one of Claims 11 to 13, characterized in that the second saw blade diameter can be set between a maximum second saw blade diameter (D_max.2) and a minimum second saw blade diameter (D_min.2) and, during the calculation of the third park position, the maximum second saw blade diameter (D_max.2) is used for the second diameter (D₂) of the second main cut.
17. Method according to Claim 16, characterized in that, after the resumption of the controlled machining, the wall saw (12) is positioned by the control unit (29) into a resumption position which corresponds to the third park position.
18. Method according to Claim 16, characterized in that, before the resumption of the controlled machining, the actual second saw blade diameter (D_real.2) of the second saw blade (16.2) is input and used for the calculation of a resumption position.
19. Method according to Claim 18, characterized in that the pivot axis (23) in the resumption position has a distance from the second end point (E₂) of D_real.2/2 for -180° ≤ -α₂ ≤ 0°, D_real.2/2 + δ·sin(α₂) for 0° < α₂ ≤ 90° and D_real.2/2 + δ·sin(90°) for 90° < α₂ ≤ 180°.
20. Method according to Claim 10, characterized in that, before the start of the controlled machining, a first blade guard (21.1) with a first blade guard width (B.1) is determined for the first saw blade (16.1), wherein the first blade guard width (B.1) is composed of a first distance (B_a.1) of the axis of rotation (19) from the first blade guard edge (71.1) and a second distance (B_b.1) of the axis of rotation (19) from the second blade guard edge (72.1), and the second distance (B_b.1) is additionally used for the calculation of a fourth park position.
21. Method according to Claim 20, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a negative first main-cut angle (-α₁) between -180° and 0°, and the pivot axis (23) in the fourth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
22. Method according to Claim 20, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 0° and 90°, and the pivot axis (23) in the fourth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(α₁)] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(α₁), D₂/2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(α₁), D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°_.
23. Method according to Claim 20, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 90° and 180°, and the pivot axis (23) in the fourth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(90°)] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(90°)], D₂/2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, D₂/2 + Δ_mounting, B_b.1 + δ·sin(90°), D₂/2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
24. Method according to Claim 20, characterized in that, before the start of the controlled machining, a second blade guard (21.2) with a second blade guard width (B.2) is determined for the second saw blade (16.2), wherein the second blade guard width (B.2) is composed of a first distance (B_a.2) of the axis of rotation (19) from the first blade guard edge (71.2) and a second distance (B_b.2) of the axis of rotation (19) from the second blade guard edge (72.2), and the second distance (B_b.2) is additionally used for the calculation of a fifth park position.
25. Method according to Claim 24, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a negative first main-cut angle (-α₁) between -180° and 0°, and the pivot axis (23) in the fifth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
26. Method according to Claim 24, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 0° and 90°, and the pivot axis (23) in the fifth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(α₁)] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(α₁), B_b.2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(α₁), B_b.2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.
27. Method according to Claim 24, characterized in that, before the interruption of the controlled machining, the saw arm (17) is arranged at a positive first main-cut angle (+α₁) between 90° and 180°, and the pivot axis (23) in the fifth park position has a distance from the second end point (E₂) of a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(90°)] for -180° ≤ -α₂ ≤ 0°, a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(90°)], B_b.2 + δ·sin(α₂)] for 0° < α₂ ≤ 90° and a maximum value of [B_b.1 + Δ_mounting, B_b.2 + Δ_mounting, B_b.1 + δ·sin(90°), B_b.2 + δ·sin(90°)] for 90° < α₂ ≤ 180°.

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