JP5313050B2 - Tire molding die piece processing apparatus and processing method - Google Patents

Description

  The present invention relates to a processing apparatus and a processing method for processing a tire molding die piece for constituting a tire molding die.

Conventionally, a tire is housed in a tire molding space of a tire molding mold in which a ring-shaped tire molding space having an inner peripheral side opened, and the tire is inflated into the tire molding space with pressure against the green tire. Then, the mold is molded and formed as a tire with a tread groove.
Since the tire molding die is heavy and large as a whole, the component as a plurality of tire molding die pieces 20 is formed in a ring shape as shown in FIG. It is comprised by arrange | positioning, combining and integrating.
Each tire molding die piece 20 is molded by a casting technique. At this time, a tread design surface 21 composed of a curved groove corresponding to the ring-shaped tire molding space is formed in advance with high accuracy by casting. The tire molding die piece 20 has a side surface (for example, 5 surfaces) other than the tread design surface 21 and is turned by a machine tool such as a lathe with the processed surfaces 20a to 20e, and the portion N is cut. In addition to this, the tire molding die piece 20 is integrated with other parts (workpieces) for forming the tire molding space.
A plurality of the tire molding die pieces 20 are connected so as to form a donut-shaped or ring-shaped tire molding space 50 as shown in FIG. The tread design surface 21 is curved in a C shape in cross section, and the tread design surface 21 is also deformed in a ring-shaped circumferential direction. As shown in FIG. 8 (b), the tire molding die piece 20 has both ends (in this case, both ends in the width direction of the curved groove of the tread design surface 21) at the chucks 26 and 27 at the centers of the opposed turning shafts 26a and 27a of the processing machine. However, it may be the direction in which the curved groove of the tread design surface 21 is extended.) The counter-rotating shafts 26a and 27a are rotated and the chucks 26 and 27 rotate the back surface (working surface 20a) and side surfaces of the tread design surface 21. The (machined surfaces 20c, 20e) and the inclined surfaces (machined surfaces 20d, 20e) are sequentially opposed to the cutting tool 60 side of the tool rotation main shaft. Cutting is performed with the cutting tool 60 for each of these facings to cut the excess portion N of the tire molding die piece 20 so that the tire molding die piece 20 can be formed and connected.
Thus, conventionally, the tire molding die piece 20 has the tread design surface 21 precisely formed by casting, and the five surfaces other than the tread design surface 21 (processed surface 20a to processed surface 20e) are cut by machining. Done. In this case, it is difficult to form the processed surfaces 20a to 20e other than the tread design surface 21 by casting because of casting accuracy. Therefore, five surfaces other than the tread design surface 21 formed by casting are processed. Shape processing is performed by machining as the surfaces 20a to 20e.

However, since the tire molding die piece 20 is arranged in a cylindrical shape (ring shape) and integrated, the processed surface 20a on the back surface other than the tread design surface 21 is a cylindrical surface obtained by dividing the outer peripheral surface of the cylinder. . There are the following methods A and B as methods for processing the processed surface 20a and the like on the cylindrical surface.
In the method A, first, an NC lathe or the like is used to lathe four pins as a reference along a trajectory along the shape of the tread design surface 21 with a tire diameter, and a pin and a cast are formed on the lathe-processed reference pin. The workpiece is set up so that the tread design surface 21 of the part contacts, and the cylindrical surface shape of the cast part is turned.
In the method B, four reference pins are set on a substrate and processed on a locus along the shape of the tread design surface 21 using an NC lathe or the like, and the pin setting substrate is processed by a milling machine or the like. A reference formed by performing reference surface processing on a part unnecessary for the final shape other than the tread design surface 21 by setting up a workpiece as a piece so that the pin and the tread design surface 21 are in contact with each other. There is a method of changing the setup to another jig using the surface and machining the cylindrical surface with a ball end mill or the like.
The part other than the cylindrical surface is changed from a 3-axis to a 5-axis processing machine on the basis of the cylindrical surface processed according to the method A or B, and shaped using a flat end mill, ball end mill, taper end mill, etc. Processing.
A technique regarding the above processing and processing method is disclosed in Patent Document 1.

JP 2000-741 A

However, according to the conventional method of processing a tire molding die piece, there are the following problems.
Since jig processing such as reference pins is required, time other than part processing such as jig processing time and setup time before processing is generated.
In addition, the setup work is performed so that the reference pin and the design surface of the cast part are in contact with each other when setting up the cylindrical surface processing. However, since the tire surface has a three-dimensional curved shape, the setup is performed by applying curved surfaces to each other. Since it becomes work, automation is difficult for the reason of the problem of centering accuracy by the skill level of an operator.
In addition, since a setup change operation is always generated between the cylindrical surface processing and other shape processing, an origin error is caused by the setup change, which causes a reduction in processing accuracy.
In addition, since two or more processing facilities are required to process cast parts, a large capital investment cost and a large facility area are required.

  In order to solve the above-described problems, the present invention provides a tire molding die piece processing apparatus and processing that does not require creation of jigs and installation of jigs for each machine tool used for setup and processing of a plurality of machine tools. Provide a method.

As a first configuration of the present invention, a tool rotation main shaft capable of supporting a machining tool and movable in three axes, and a holding means for holding a tire molding die piece on which a tread design surface having a curved groove is formed, , A tire molding die piece processing apparatus for processing a processing surface other than the tread design surface into a desired shape by relatively moving the tool rotation main shaft and the holding means, and a plurality of the tread design surfaces attached to the tool rotation main shaft Design surface measuring means for measuring the height of the measurement position with respect to the reference position, detection means for detecting an inclination amount or position of the tread design surface with respect to the reference position in the three-dimensional direction based on the measurement result of the design surface measuring means, and detection Based on the result detected by the means, a correction means for correcting the control of at least one of the tool rotation spindle and the holding means is provided.
According to this configuration, the design surface measuring means that can correct the positions of the tool rotation spindle and the holding means and measures the height of the tread design surface of the tire molding die piece with respect to a plurality of reference positions is attached to the tool rotation spindle. And detecting means for detecting the inclination amount or position of the tread design surface with respect to the reference position in the three-dimensional direction based on the measurement result of the design surface measuring means, and based on the result detected by the detection means, By providing correction means for correcting at least one control of the holding means, the horizontal position of the tread design surface is obtained based on the measurement result of the design surface measurement means, and the tool rotation spindle or the horizontal position of the tread design surface is determined. The machining reference of the machine tool can be set so that the holding means is controlled and the tool rotation main axis becomes vertical.

As a second configuration of the present invention, the holding means are opposed to each other and are rotatable chucks,
The chuck has a reference surface that supports both ends of the tire molding die piece, and the tire molding die piece rotates around the rotation axis of the chuck.
According to this configuration, the design surface measuring means includes a sensor that is attached to the tool rotation main shaft and abuts against a plurality of predetermined points on the design surface to detect the height of each point with respect to the reference position. Machining can be performed simply by replacing a contact-type sensor with a tool such as an end mill attached to the tool rotation spindle after measurement and correction by a sensor. Further, by measuring a plurality of predetermined points on the design surface with an arbitrary position of the tool rotation spindle as a reference height, the inclination of the design surface with respect to the X, Y, Z axes, etc. of the machine tool can be detected.

As a third configuration of the present invention, the plurality of measurement positions on the tread design surface are measured when the intersection of the chuck mounting direction center line P and the width direction center line Q in the tire molding die piece is the measurement reference position. 4 points equidistant from the position in the chuck mounting direction and the width direction, the design surface measuring means measures the height position of the 4 rotating tool spindles, and the detecting means determines the width of the tire molding die piece according to the measurement result. The direction inclination amount α or the chuck attachment direction inclination amount β is obtained.
According to this configuration, the design surface measuring means uses the intersection of the chuck mounting direction center line P and the width direction center line Q of the design surface of the tire molding die piece as a reference position, and from the reference position to the chuck mounting direction and the width direction. The first measurement point and the second measurement point that are equidistant and symmetric with respect to the center line P in the chuck mounting direction, and the first and second measurement points are symmetric with respect to the center line Q in the width direction. The third measurement point and the fourth measurement point are obtained, the height position of each measurement point with respect to the rotary tool spindle is detected by the design surface measuring means, and the inclination amount α in the width direction of the tire molding die piece or the chuck By obtaining the amount of inclination such as the amount of inclination β in the mounting direction, the inclination with respect to the rotary tool spindle can be easily and accurately obtained from the design surface having a three-dimensional curved surface.

As a fourth configuration of the present invention, the design surface measuring means measures a plurality of heights of the tread design surface, whereby the height position of the processing surface of the tire molding die piece attached to the chuck, the processing origin, The correction means is configured to correct the control of the tool rotation spindle and the rotation axis based on this error.
According to this configuration, the design surface measurement means obtains an error between the height position of the processing surface of the molding die piece attached to the chuck and the processing origin by measuring a plurality of heights of the tread design surface. Because of this error, the correction means corrects the control of the tool rotation spindle and rotation axis, so that the error between the tread design surface and the processing origin is automatically corrected by attaching the molding die piece once to the chuck. When processing other than the design surface is performed, processing based on the tread design surface can be performed, and further, setup before processing can be omitted.

As a fifth configuration of the present invention, the design surface measuring means is configured by a contact sensor.
According to this configuration, since the contact type sensor attached to the tool rotation spindle is in direct contact with the tread design surface, the measured value and the processing position are changed when the contact type sensor is replaced with a tool for actual processing. Almost no errors can be eliminated.

As a sixth embodiment of the present invention, a measuring step for measuring the height of the tread design surface with respect to a reference position by attaching the design surface measuring means to the tool rotation spindle, and a detecting means based on the measurement result of the design surface measuring means Is a detection step for detecting an inclination amount or position of the tread design surface with respect to a reference position in the three-dimensional direction, and a correction means for correcting the control of at least one of the tool rotation spindle and the holding means based on the detection result of the detection means. And having a step.
According to this embodiment, by measuring the amount of inclination or position of the tread design surface of the tire molding die piece with respect to the horizontal position, and applying correction to control of either the tool rotation spindle or the holding means based on the measurement result, The machining reference of the machine tool can be set so that the tool rotation spindle is perpendicular to the horizontal position of the tread design surface.

  Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not necessarily essential to the solution, but includes a configuration that is selectively adopted.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the tire molding die piece and processing apparatus which concern on Embodiment 1 of this invention. The center position measurement conceptual diagram which concerns on Embodiment 1 of this invention. FIG. 3 is a top view of a measurement point of a tilt amount and a measurement concept according to Embodiment 1 of the present invention. The measurement result display figure by the monitor concerning Embodiment 1 of the present invention. The figure which shows the correction | amendment by the 1st correction | amendment means which concerns on Embodiment 1 of this invention. The figure which shows the correction | amendment by the 2nd correction | amendment means which concerns on Embodiment 1 of this invention. The figure which shows the measurement which concerns on Embodiment 2 of this invention, and the correction | amendment after a measurement. The tire molding conceptual diagram of the tire molding die piece concerning the embodiment of the present invention. The schematic diagram of the tire mold piece and processing device concerning Embodiment 3 of the present invention. The figure which shows the jig | tool and tire molding die piece which concern on Embodiment 3 of this invention. The conceptual diagram of the measurement of the amount of inclination concerning Embodiment 3 of the present invention.

Embodiment 1
FIG. 1 is a schematic view showing one embodiment of a processing apparatus for a tire molding die piece according to the present invention, in which 1 is a machine tool, and this machine tool 1 has a machine tool body 2. The machine tool main body 2 includes a tool rotation main shaft 3 protruding downward and a tool chuck 4 provided on the tool rotation main shaft 3. Note that a cutting tool 60 such as a cutting blade, which will be described later, is usually attached to the tip of the tool chuck 4 at the time of cutting after the measurement is completed, and cutting is performed.

  The tool rotation main shaft 3 is rotatable, rotates while holding a cutting blade as the cutting tool 60, and is movable and pivotable in three axes (three dimensions). The tool rotation main shaft 3 moves in the directions of X, Y, and Z axes (three axes) intersecting at right angles, and can be controlled along the Z axis, for example. That is, a swing motion is possible. For this reason, the angle of the tool rotation spindle 3 and the like can be controlled by correction described later.

In the present embodiment, a contact type sensor 5 as a design surface measuring means is attached to the tool chuck 4 at the tip of the tool rotation spindle 3 before machining.
A spherical contact 6 protruding from the tip of the contact sensor 5 moves to a plurality of preset points on a tread design surface 21 formed as a curved groove of a tire molding die piece 20 described later, and descends. By making contact with each other, it is possible to detect the height of the contact portion with respect to an arbitrary reference position (horizontal position) (which can be identified with the descending stroke of the tool rotation spindle 3). As shown in FIGS. 2 and 3, this height is the height of a plurality of points in the direction of arrow F which is the chuck mounting direction (in this example, the width direction of the curved groove of the tread design surface 21). It is the height of a plurality of points in the direction of arrow G as a direction perpendicular to (arrow F).
The signal from the contact sensor 5 is supplied to the first inclination amount detection means 7 and the second inclination amount detection means 8 at a height corresponding to a plurality of points designated in advance.

The first inclination amount detection means 7 detects the inclination amount α of the tire molding die piece 20 in the direction of arrow F, and the signal is output to the first correction means 9, and the second inclination amount detection means 8 A tilt amount β of the tire molding die piece 20 in the direction of the arrow G is detected, and a signal of the tilt amount β is output to the second correcting means 10.
The first correcting means 9 detects an inclination amount α in the direction of the arrow F, in this case, the width direction of the curved groove of the tire molding die piece 20 based on the contact result, and this tread design surface 21 on the tool rotation main shaft 3. The correction is made so as to cancel the inclination amount α in the width direction of the curved groove. Therefore, the tool rotation main shaft 3 is slightly tilted in accordance with the tilt amount α.
Further, the second correcting means 10 detects the amount of inclination β in the direction of the arrow G of the tire molding die piece 20 in this case, in this case, the extending direction of the curved groove of the tread design surface 21, and holds the chuck. Correction is made so as to cancel out the inclination amount β at the rotational positions of the opposed turning shafts 26a and 27a as rotating shafts. Therefore, the correction control is applied to the rotational positions of the opposed turning shafts 26a and 27a corresponding to the inclination amount β.
Reference numeral 18 denotes a monitor provided in the machine tool body 2.

  2 and 3, the tire molding die piece 20 has the tread design surface 21 of the above-mentioned bay-shaped groove on one surface, and the tread design surface 21 with the tread design surface 21 when viewed sideways as a whole. It is formed into a substantially trapezoidal shape, and both ends 24 and 25 thereof have both ends in the direction of arrow F, and in this embodiment, both ends in the width direction of the tread design surface 21 have portions that do not require precision for processing the tire molding die piece 20. It is formed. It should be noted that a projecting piece or the like may be formed integrally with the tire molding die piece 20 instead of forming a portion that does not require accuracy in processing both ends in the width direction.

The machine tool 1 includes chucks 26 and 27 that rotate in conjunction with opposed turning shafts 26a and 27a that are mutually rotatable rotational axes that face each other, and shaft portions 32 and 33 that are held by the chucks 26 and 27. Are formed with reference portions 28 and 29, and the tire molding die piece 20 is fixed to the reference portions 28 and 29 by a fixing means (not shown).
The reference portions 28 and 29 are formed by one side of support pieces 30 and 31 that protrude in opposite directions.

  The support pieces 30 and 31 are attached by being bent in a crank shape from the ends of the bent pieces 34 and 35 of the shaft portions 32 and 33. Pins 30a and 31a project from the reference portions 28 and 29 of the support pieces 30 and 31, and the extending direction of the tire molding die piece 20, that is, one side surface in the longitudinal direction is in contact with the pins 30a and 31a. The movement of the tire molding die piece 20 in the arrow G direction, in this embodiment, in the width direction of the tread design surface 21 is restricted, and the length of the tread design surface 21 in the width direction is set to 2 as shown in FIGS. The center axis (extension direction center axis) 40 to be divided can coincide with the center axes 41 and 42 of the shaft portions 32 and 33 on the chucks 26 and 27 side.

The tool rotation main shaft 3 is perpendicular to the opposed turning shafts 26 a and 27 a and constitutes the machine tool 1.
First, when processing the back processing surface 20a, the center axis 40 of the tire molding die piece 20 rotates the tire molding die piece 20 intermittently so that each processing surface 20a to 20e is tool-rotated main spindle for each cutting. 3 is a central axis for enabling processing toward the upper side, the length of the bent pieces 34, 35 is set to a predetermined length, and the tire molding die piece 20 is supported by the support piece 30, By positioning at 31, the center axis 40 of the tire molding die piece 20 is set to coincide with the center axes 41 and 42 of the chucks 26 and 27.

  In other words, in the present embodiment, at the time of processing, the contact type sensor 5 is replaced with a cutting tool 60 made of a cutting blade, so that five surfaces (processed surfaces 20a to 20e) other than the tread design surface 21 of the tire molding die piece 20 are formed. While being held by the pair of chucks 26 and 27, rotating to the tool rotating spindle 3 side and sequentially facing each other, and cutting each time facing each other, surface cutting can be performed under one chuck.

  As shown in FIG. 8A, a plurality of tire molding die pieces 20 that have been cut on five surfaces other than the tread design surface 21 by the above method are connected in the tire circumferential direction. Thus, a tire molding space 50 having an inner periphery opened can be formed by joining in a ring shape, and by pressing a green tire (not shown) with a pressing means using the tire molding space 50, The design mold of the tread design surface 21 is inverted and transferred to form a slip-proof tread groove on the tire.

Next, the process sequence which processes the tire molding die piece 20 with the said structure and method is demonstrated.
The tire molding die piece 20 is manufactured in advance in a trapezoidal shape having a predetermined size in which a tread design surface 21 as a bay-shaped groove is accurately cast and formed by casting, as shown in FIG. The contact type sensor 5 is attached to the tool chuck 4, and the chucks 26, 27 are used as the reference for the shaft portions 32, 33 in the direction of arrow F of the tread design surface 21 of the tire molding die piece 20, in this embodiment, in the extending direction. The one side of the extending direction of the curved groove of the tire molding die piece 20 is supported by the pins 28a and 29, and is positioned by the pins 30a and 31a so that the tread design surface 21 faces upward and faces the tool rotation main shaft 3 side.

Next, the height of a plurality of points on both sides of the tread design surface 21 is measured. That is, the tool rotation main shaft 3 is driven as follows, and is contacted by the contact 6 of the contact sensor 5, so that predetermined points (a point in the arrow F direction and a point in the arrow G direction) of the tread design surface 21 are specified. The height with respect to the reference position is detected.
Specifically, an intersection A of the chuck attachment direction center line P and the width direction center line Q obtained by bringing the contact 6 into contact with the tread design surface 21 is obtained. This intersection A becomes the center of the tread design surface 21. Using this intersection A as a reference position, two points B and D are determined so as to be equidistant in the chuck attachment direction F and the width direction G across the chuck attachment direction center line P from the reference position. , D define two points C and E that are symmetrical with respect to the center of the chuck mounting direction, and measure the height of each point B, C, D, and E, so that the tread design surface 21 has a center line in the chuck mounting direction. It is possible to measure the degree of inclination with respect to P and the center line Q in the width direction.
That is, the first measurement that is an equidistant from the reference position in the chuck mounting direction and the width direction and symmetrical with respect to the center of the chuck mounting direction is the intersection point A between the chuck mounting direction center line P and the width direction center line Q. A point B, a second measurement point D, a third measurement point C and a fourth measurement point E, in which the first measurement point B and the second measurement point D are symmetrical with respect to the chuck mounting direction center line P, are obtained. The surface measuring means detects the height position of each of the measurement points B, C, D, and E with respect to the rotary tool spindle 3, so that the direction of arrow F of the tire molding die piece 20, that is, the width direction of the curved groove is determined. The amount of inclination, such as the amount of inclination α, the direction of arrow G, that is, the amount of inclination β in the extending direction of the curved groove, is obtained. In this example, the chuck attachment direction center line P is equal to the center axis 40.

  By detecting the height of a plurality of points on the tread design surface 21 by such a method, the height signal from the contact sensor 5 is output to the first inclination amount detection means 7, and the first inclination amount detection means. 7, the inclination amount α in the arrow F direction, in this example, the width direction of the curved groove, is detected, and correction corresponding to the inclination amount α in the width direction of the curved groove is applied to the tool rotation main shaft 3. As a result, the tool rotation main shaft 3 is corrected by the inclination amount α, so that the inclination amount α can be controlled to zero. Since such correction is made every time the processed surfaces 20a to 20e are processed, the tire molding die piece 20 can be cut accurately even if the inclination amount α is inherent.

Further, a height signal is output from the contact sensor 5 to the second inclination amount detecting means 8, and the second inclination amount detecting means 8 detects the inclination amount β in the extending direction of the curved groove in this embodiment, and the chuck 26 27, the turning correction corresponding to the amount of inclination β in the extending direction of the curved groove is applied to the opposing turning shafts 26a, 27a. As a result, the opposing turning shafts 26a and 27a of the chucks 26 and 27 can set the inclination amount β in the extending direction of the curved groove to zero.
Under such control, the contact type sensor 5 is replaced with a cutting tool 60 made of a cutting blade, and the machining surfaces 20a to 20e are cut, so that necessary machining surfaces can be cut. .

The correction by the inclination amount α and the inclination amount β is performed for each of the processed surfaces 20a to 20e.
After the measurement of the machining surface is completed, the chucks 26 and 27 are rotated so that the other machining surfaces face the tool rotation main shaft 3 side, and each machining surface is subjected to correction control by the first correction unit 9 and the second correction unit 10. By cutting 20a to 20e, the processing can be performed without removing the tire molding die piece 20 from the chucks 26 and 27.

  That is, in the embodiment described above, both ends of the tread design surface shape of the tire molding die piece 20 are measured by the contact sensor 5, and the center position in the longitudinal direction of the tire molding die piece 20 is derived. Moreover, the tire molding die piece 20 is pressed against the reference pins 30a and 31a that are accurately arranged so that the center position in the arrow G direction of the design surface shape of the tire molding die piece 20 is parallel to the processing machine axis. The indexing is performed.

  Next, four points equidistant from the center position of the tread design surface 21 of the tire molding die piece 20 are measured, and the inclination of the tire molding die piece 20 is measured. Furthermore, by calculating the theoretical value of the positional relationship between the measurement points (design value of the tread design surface shape) based on the 3D data of the design surface shape prepared in advance outside the figure, the difference in the measured value depending on the design surface shape can be obtained. Don't misrecognize as tilt.

  Next, the inclination amount α (angle) of the tire molding die piece 20 obtained as described above is used as a correction value, and the inclination correction in the chuck mounting direction (longitudinal direction) is performed in the direction of arrow F on the turning axis of the rotary tool spindle 3. Inclination correction is performed by rotating the opposed turning shafts 41 and 42.

  Finally, in order to process the tire molding die piece 20 in the coordinate system newly formed by the axis correction, the NC control device 3 (not shown) that controls the operation of the tool rotation main shaft 3 and the opposed turning shafts 41 and 42 is used. Perform dimensional coordinate transformation.

  FIG. 4 shows a display example of the monitor 18, where P1 is a pattern of the contact result based on the output signal of the contact sensor 5, and P2 is a pattern of the output result of the first inclination amount detecting means 7, In the pattern P2, the outer shape pattern PM is read from the storage means outside the figure in accordance with the tire size mold piece to be molded together with the inclination amount α in the arrow F direction (around the Y axis), in this embodiment, the width direction of the curved groove. It is displayed based on the pattern signal. The pattern P3 in which the inclination amount α in the width direction of the curved groove is set to 0 by correcting the inclination amount α in the width direction of the curved groove output from the first inclination amount detection means 7 by the first correction means 9 is monitored. It can be seen from this display that the correction is applied to the inclination amount α in the width direction of the curved groove.

According to the above configuration, as shown in FIG. 5A, when viewed in the F direction in FIG. 5A, each point on the tread design surface 21 when the tread design surface 21 has an inclination of α. The inclination amount α is detected by contact of the sensor 5 with the sensor 5. A signal corresponding to the inclination amount α is sent to the first inclination amount detecting means 7, and the tire molding die piece 20 is inverted as shown in FIG. 5B for the purpose of processing the processing surface 20a on the back side, for example. When this is done, it is reversed with the inclination amount α, so that the first correction means 9 adjusts the tool rotation main shaft 3 with respect to the inclination amount α, so that the correction control is performed so as to come into contact with the machining surface 20a at a right angle. To do. Similar corrections are made for other processed surfaces.
Further, as shown in FIG. 6 (a), in the G direction, the inclination amount β is detected by the contact of the contactor 6 with each point because the tread design surface 21 has an inclination of β. Then, a signal corresponding to the tilt amount β is sent to the second tilt amount detecting means 8, and the opposite turning shafts 26a and 27a are processed, for example, on the processing surface 20a on the back side as shown in FIG. 6B. , The second correction means 10 adjusts the rotation position of the opposed swiveling shafts 26a and 27a with respect to the inclination amount β, thereby adjusting the machining surface 20a. As shown in FIG. 6C, correction control is performed so that the horizontal position is obtained.
Similar corrections are made for other processed surfaces.

  In the display example of the monitor 18 of FIG. 4, P4 is a pattern of the contact result based on the output signal of the contact sensor 5, and in this pattern P5, along with the amount of inclination β in the direction of the arrow G, in this embodiment the extending direction of the curved groove. The outer shape pattern PN is displayed based on the pattern signal read by the storage means outside the figure in accordance with the tire size mold piece to be molded. By correcting the output of the second inclination amount detection means 8 by the second correction means 10, a pattern P6 in which the inclination amount β in the chuck rotation direction is zero is displayed on the monitor 18, and this display indicates the inclination in the chuck rotation direction. It can be seen that the amount β is corrected.

According to this embodiment, the setup error is automatically corrected by turning the rotation axis of the tool rotation main shaft 3 perpendicular to the opposed turning shafts 26a, 27a and the opposed turning shafts 26a, 27a. By fixing the shaft portions 32 and 33 to the respective 27a, clamping the tire molding die piece 20 in a bridging state to the support pieces 30 and 31 of the shaft portions 32 and 33, and rotating the opposed turning shafts 26a and 27a synchronously. The tread design surface 21 and the processing surface 20a (cylindrical surface side) on the back surface of the tire molding die piece 20 are processed with the same setup, and the setup procedure can be simplified.
As described above, there is an effect that the reference jig processing, the reference surface processing of the cast piece, and the centering operation at the time of the piece setup can be eliminated.

The main points of the present invention are summarized as follows.
According to the method of the present invention, the coordinate system can be set directly from the design surface, the reference pin is unnecessary, and the processing time of the reference pin and the setup time related thereto are unnecessary.
Further, since the position and inclination of the tire molding die piece 20 (work) are measured from the design surface and the error is automatically corrected, there is no need for a centering operation at the time of setup, and the setup accuracy depends on the skill level of the operator. Nothing will happen.
Further, since the setup work is a simple work that does not require skill, the machining process can be automated, and the design surface side and the cylindrical surface side can be collectively processed with one chuck.
This eliminates the need to replace the setup, which was an element that reduces the machining accuracy, improves the machining accuracy, and can perform all necessary machining within the same machine, eliminating the need to have multiple machining facilities. Capital investment costs and installation area can be reduced.

That is, in the contact sensor 5, it contacts upward at a plurality of locations in the tread design surface 21 of the tire molding die piece 20 facing the tool side, and the position in the three-dimensional direction of the inner surface of the bay-shaped groove is determined. The inclination amount α and the inclination amount β are obtained by the first inclination amount detection means 7 and the second inclination amount detection means 8.
When the tire molding die piece 20 is turned 180 ° and the back surface is processed as the processing surface 20a, the inclination amount α and the inclination amount β according to the three-dimensional position of the inner surface of the bay-shaped groove obtained in this way are used. Correct and cut.
Alternatively, when machining the processed surface 20b or the processed surface 20c of the other surface, the machining is performed with correction by the inclination amount α and the inclination amount β. Other processed surfaces are processed in the same manner.
In other words, if the inclination of the tire molding die piece 20 itself is found at the three-dimensional position on the inner surface of the bay-shaped groove, the tire molding die piece 20 facing this direction no matter what direction the piece is oriented based on this inclination. The inclination angle can be determined and corrected by arithmetic processing technology.
The inclination of the tire molding die piece 20 itself appears due to various factors such as an error in casting the piece, an error in attaching the piece to the chuck, and a balance position between the left and right chucks themselves.

Embodiment 2
In the first embodiment, the inclination amount α in the width direction of the curved groove of the tire molding die piece 20 and the inclination amount β in the chuck rotation direction are detected based on the output of the contact sensor 5, and these inclination amounts are detected. Although it has been described that the tool rotation main shaft 3 and the chucks 26 and 27 are corrected and controlled by α and β, the present invention is not limited to the detection of the tilt amount, and the height of each of the machining surfaces 20a to 20e with respect to an arbitrary reference position. An error between the position and the machining origin may be obtained, and the tool machining spindle 3 or the opposed turning axes 26a and 27a may be controlled by the third correction means based on this error.

  That is, for example, as shown in FIG. 7A, as a result of measuring a plurality of points on the tread design surface 21, the central axis 40 is displaced by a displacement r with respect to the central axes 41 and 42. , 42, when the center axis 40 is close to the cutting tool 60 by a displacement r, the displacement r is detected by a displacement means (not shown) and corrected to the position of the tool rotation spindle 3 that holds the cutting tool 60. In addition, the position of the tool rotation spindle 3 may always be set to the upper position by the displacement r.

  7 (a) and 7 (b), the tire molding die piece 20 has an arrow F direction that is a chuck mounting direction and a longitudinal direction, and an arrow G that is perpendicular to the chuck mounting direction F. The tire molding die piece 20 may be formed with the chuck mounting direction F as the short direction and the arrow G as the long direction. Further, the tread design surface 21 is curved in a C shape in the chuck mounting direction indicated by the arrow F, but may be curved in a C shape along the arrow G (perpendicular to the arrow F).

Embodiment 3
The machine tool 1 described in the first embodiment includes a tool rotation main shaft 3 that holds and rotates the cutting tool 60 and is movable in three axes (three dimensions), and that is capable of swinging around the X axis. , Having chucks 26 and 27 that rotate in conjunction with opposing rotating shafts 26a and 27a that can be rotated synchronously with each other, and reference portions 28 formed on shaft portions 32 and 33 held by chucks 26 and 27, Although the tire molding die piece 20 has been described as being abutted and fixed to the pins 30a and 31a projecting from 29, the machine tool 1 is capable of 5-axis control, and as an example, as shown in FIG. It may be a machine tool 1 'such as a 5-axis control machining center.

  As shown in FIG. 9, the machine tool 1 ′ has a machine tool main body 2 ′, a tool rotation main shaft 3 protruding downward from the machine tool main body 2 ′, and a tool chuck 4 provided on the tool rotation main shaft 3. Have Note that a cutting tool 60 such as a cutting blade, which will be described later, is attached to the tip of the tool chuck 4 at the time of cutting after completion of the measurement.

Further, the machine tool 1 ′ has a turning table 81 as a holding means that is supported at both ends by opposed turning shafts 26 a and 27 a as rotating shafts that rotate synchronously facing each other, and a rotating table 82 that rotates on the turning table 81. With. The tire molding die piece 20 is fixed to the rotary table 82 together with a jig 70 described later by fixing means not shown.
The turning table 81 is provided so that the Z axis of the machine tool 1 ′ and the central axis 41 of the opposing turning shafts 26 a and 27 a that support the turning table 81 are parallel to each other by the second correction means 10 and a control means (not shown). The operations of the opposed turning shafts 26a and 27a are controlled to turn together with the rotary table 82 in the direction of the arrow u.
The rotary table 82 is positioned substantially at the center of the turning table 81, has a holding means and a rotating mechanism (not shown), and is controlled in operation by the first correcting means 9 and the control means (not shown) to rotate in the direction of the arrow v. .

The tire molding die piece 20 fixed to the rotary table 82 is fixed together with the jig 70.
As shown in FIG. 10, the jig 70 includes a frame body 72 and reference portions 71A and 71B. The reference portions 71A and 71B are formed at both ends in the longitudinal direction of the frame body 72. A frame is formed between the portions 71B so as to have an opening 73. Pins 30a and 31a project from the reference portions 71A and 71B, respectively, and one side surface in the longitudinal direction of the tire molding die piece 20 abuts on the pins 30a and 31a. The movement in the width direction of the curved groove of the design surface 21 is restricted, and further, the tread design surface 21 is brought into contact with one side in the short direction of the tire molding die piece 20 on the pin 32a projecting from the reference portion 71A. The movement of the curved groove in the extending direction is restricted. Further, the pins 30 a to 32 a regulate the movement of the tire molding die piece 20, whereby the position of the center 40 in the width direction of the curved groove and the center 77 in the width direction of the jig 70 coincide.
That is, the processing surface 20a side of the tire molding die piece 20 is placed on the reference portions 71A and 71B of the jig 70 so as to be bridged by the reference portions 71A and 71B, and is brought into contact with the pins 30a to 32a. The centering of the jig 70 and the tire molding die piece 20 is completed.
Then, after the tire molding die piece 20 is fixed to the jig 70, the outer side surface of the frame body 72 of the jig 70 is brought into contact with the rotary table 82 so as to stand vertically. The tire molding die piece 20 can turn around the rotation center of the turntable 82 by being fixed by the fixing means.
Thereby, the processing surfaces 20a to 20e can be processed, and in particular, the processing surface 20a is processed when the cutting tool 60 enters from the opening 73 of the jig 70.

The tool rotation main shaft 3 rotates while holding a cutting blade as the cutting tool 60, and moves in the X, Y, and Z axes (three axes) directions as the processing machine shaft. A contact sensor 5 as a design surface measuring means is attached to a tool chuck 4 at the tip of the tool rotation main spindle 3 before processing.
The spherical contact 6 protruding from the tip of the contact sensor 5 moves to a plurality of preset points on the tread design surface 21 formed as a curved groove of the tire molding die piece 20 and descends. By making contact, it is possible to detect the height of the contact portion with respect to an arbitrary reference position (horizontal position) (which can be identified with the descending stroke of the tool rotation spindle 3). This height is the height of a plurality of points in the extending direction and the width direction of the curved groove of the tread design surface 21 in this example.
The signal from the contact sensor 5 is supplied to the first inclination amount detection means 7 and the second inclination amount detection means 8 at a height corresponding to a plurality of points designated in advance.

The second inclination amount detection means 8 detects the inclination β of the tire molding die piece 20 around the extending direction of the curved groove, and the signal is output to the second correction means 10, and the first inclination amount detection means 7. Thus, the inclination amount α of the tire molding die piece 20 around the width direction of the curved groove is detected, and a signal of the inclination amount α is output to the first correction means 9.
The second correction means 10 detects the arrow G, in this case, the inclination amount β in the width direction of the curved groove of the tire molding die piece 20 based on the contact result, and the rotation table 82 has the tread design surface 21 as the tread design surface 21. Correction is made so as to cancel the inclination amount β in the width direction of the curved groove. Therefore, correction control corresponding to the inclination amount β of the tread design surface 21 is applied to the rotary table 82.
Further, the first correcting means 9 detects the inclination amount α in the direction of the arrow F of the tire molding die piece 20, in this case, the extending direction of the curved groove of the tread design surface 21, based on the contact result. Correction is applied to the rotational position so as to cancel the inclination amount α. Therefore, correction control corresponding to the inclination amount α of the tread design surface 21 is applied to the turning table 81.
Reference numeral 18 denotes a monitor provided in the machine tool main body 2 '.

According to the above configuration, the inclination amount α and the inclination amount β of the tread design surface 21 can be measured and corrected as follows.
First, as shown in FIG. 11 (a), after fixing the tire molding die piece 20 to the jig 70, the outer side surface of the frame body 72 of the jig 70 is brought into contact with the rotary table 82 to be vertical. And fixed by fixing means not shown.
Next, as shown in FIG. 11 (b), the turning table 81 is rotated around the Z axis so that the tread design surface 21 of the tire molding die piece 20 faces the tool rotation main shaft 3.
As a result, the contact 6 of the contact sensor 5 attached to the tool rotation spindle 3 can be brought into contact with the tread design surface 21.
In the state shown in FIGS. 11B and 11C, the contact 6 of the contact sensor 5 is brought into contact with the tread design surface 21, and the heights of a plurality of points on the tread design surface 21 are set as shown in the first embodiment. By measuring, the inclination amount α in the extending direction of the curved groove of the tread design surface 21 and the inclination amount β in the width direction of the curved groove are measured. Based on the measured results, the processing surfaces 20 a to 20 e can be processed by correcting the turning table 81 with the second correction unit 10 and correcting the rotary table 82 with the first correction unit 9.

According to the present embodiment, the center position in the longitudinal direction of the jig 70 and the tire molding die piece 20 is positioned and fixed to the rotary table 82, whereby the central axis 40 of the tire molding die piece 20 is attached to the rotary table 82. Since the curved groove extending direction of the tread design surface 21 of the tire molding die piece 20 and the rotation axis of the rotary table 82 can be made parallel to each other, the tilt amount β can be corrected by rotating the rotary table 82. The tilt amount α can be corrected by turning the turning table 81 around the Z axis.
That is, by fixing only one end side of the tire molding die piece 20 together with the jig 70 to the rotary table 82, processing other than the tread design surface 21 can be performed with one chuck.

  Note that a non-contact sensor may be used instead of the contact sensor 5 shown in the first to third embodiments, and the inclination of the tread design surface 21 using a CCD camera or the like to measure the tread design surface 21. It may be configured to detect the quantity or position.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 machine tool, 2 machine tool body, 3 tool rotation spindle, 4 tool chuck,
5 contact type sensor, 6 contact, 7 first inclination amount detecting means, 8 second inclination amount detecting means,
9 First correction means, 10 Second correction means, 18 Monitor, 20 Tire molding die piece, 20a Processing surface, 20b Processing surface, 20c Processing surface, 20d Processing surface, 20e Processing surface,
21 tread design surface, 24 end, 25 end, 26 chuck,
26a opposed swivel axis, 27 chuck, 27a opposed swivel axis, 28 reference portion,
29 Reference part, 30 support piece, 30a pin, 31 support piece, 31a pin,
32 shaft part, 40 center axis, 41 center axis, 42 center axis, 50 tire molding space,
60 Tools, α tilt amount, β tilt amount.

Claims (6)

A tool rotation spindle capable of supporting a machining tool and moving in three axes;
Holding means for holding a tire molding die piece on which a tread design surface having a curved groove is formed;
A tire molding die piece processing apparatus for processing a processing surface other than the tread design surface into a desired shape by relatively moving the tool rotation main shaft and the holding means,
Design surface measurement means for measuring the height of a plurality of measurement positions on the tread design surface attached to the tool rotation spindle with respect to a reference position;
Detecting means for detecting an inclination amount or position with respect to a reference position in a three-dimensional direction of the tread design surface based on a measurement result of the design surface measuring means;
A tire molding die piece processing apparatus, comprising: a correction unit that corrects control of at least one of the tool rotation main shaft and the holding unit based on a result detected by the detection unit. The holding means are opposed to each other and are rotatable chucks,
The chuck has a reference surface for supporting both ends of the tire molding die piece,
The tire molding die piece processing apparatus according to claim 1, wherein the tire molding die piece turns around a rotation axis of the chuck. The plurality of measurement positions on the tread design surface are:
When the intersection of the chuck mounting direction center line P and the width direction center line Q in the tire molding die piece is a measurement reference position, the four points are equidistant from the measurement reference position in the chuck mounting direction and the width direction. ,
The design surface measuring means measures the height position of the four-point rotary tool spindle;
3. The tire molding die according to claim 2, wherein the detection unit obtains an inclination amount α in the width direction or an inclination amount β in the chuck mounting direction of the tire molding die piece based on a result of the measurement. Piece processing equipment.   The design surface measuring means measures a plurality of heights of the tread design surface to obtain an error between the height position of the processing surface of the tire molding die piece attached to the chuck and the processing origin, and this error 4. The tire molding die piece processing apparatus according to claim 2, wherein the correction means corrects the control of the tool rotation main shaft and the rotation shaft.   5. The tire molding die piece processing apparatus according to claim 1, wherein the design surface measuring means includes a contact sensor. A tool rotation spindle capable of supporting a machining tool and moving in three axes;
Holding means for holding a tire molding die piece on which a tread design surface having a curved groove is formed;
A method of processing a tire molding die piece, in which a processing surface other than the tread design surface is processed into a desired shape by relatively moving the tool rotation main shaft and the holding means,
A measuring step of attaching a design surface measuring means to the tool rotation main spindle and measuring the height of the tread design surface with respect to a reference position;
A detecting step in which the detecting means detects a tilt amount or a position of the tread design surface with respect to a reference position in a three-dimensional direction based on a measurement result of the design surface measuring means;
A processing method for a tire-molding die piece, wherein the correction means includes a correction step for correcting the control of at least one of the tool rotation main shaft and the holding means based on the result detected by the detection means.

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