JP2012011499A - Grinding work method of workpiece and grinding machine, calculation program of moving route data used for the same and storage medium therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding machine which obtains moving route data of a grinding wheel with respect to a slope to be ground of a workpiece, the slope having an inclined angle changed in a three-dimensional curved surface manner, based on distal end shape data of the grinding wheel and working shape data of the workpiece, and which enables an NC program to be easily generated.SOLUTION: Three-dimensional coordinate data of a distal end shape of the grinding wheel are calculated by a distal end shape three-dimensional coordinate data conversion part 51 provided in a CPU 42. Working shape three-dimensional coordinate data of the workpiece are calculated by a working shape tree-dimensional coordinate data conversion part 52. Moving route data of the grinding wheel with respect to the slope to be ground of the workpiece, the slope having an inclined angle changed in a three-dimensional curved surface manner, are calculated by a moving route data calculation part 53 based on both of the coordinate data. NC commandment data are formed by an NC commandment data calculation part 54 based on the moving route data.

Description

  The present invention relates to a grinding method and a grinding machine for a surface to be ground having a three-dimensional curved surface of a workpiece, a calculation program for moving path data used therefor, and a storage medium therefor.

  Conventionally, as shown in FIG. 5, a spline shaft 32 that is used in an automatic speed reduction mechanism of an automobile and transmits a rotational motion includes a protrusion 32 a and a groove 32 b. The spline shaft 32 is extruded by a cold forging die shown in FIG. This mold is composed of an outer mold 15 located outside and an inner mold 20 located inside the outer mold 15. A large number of protrusions 17 are integrally formed at an equal pitch in the circumferential direction of the main body 15 a on the inner peripheral surface 15 b of the mold main body 15 a forming the annular shape of the outer mold 15. Each of the protrusions 17 has a straight portion 18 having a substantially trapezoidal cross section and a size that does not change in size with respect to the direction of the central axis O (perpendicular to the plane of FIG. 6) of the mold body 15a, and the central axis. With respect to the O direction, the cross section has a trapezoidal shape and is configured by an inclined portion 19 whose size changes. The inclination angle α of the to-be-ground slope 18a on both the left and right sides of the straight portion 18 with respect to the inner peripheral surface 15b, and the height and width from the inner peripheral surface 15b of the to-be-ground top surface 18b are set to be the same in all parts. An inclination angle β with respect to the inner peripheral surface 15 b of the inclined slope 19 a on both the left and right sides of the inclined portion 19 is set so as to decrease toward the tip of the inclined portion 19. The width of the top surface 19b to be ground of the inclined portion 19 is the same as the width of the top surface 18b to be ground, and the height of the top surface 19b to be ground is made lower toward the tip.

  As shown in FIG. 6, the straight portion 18 and the inclined portion 19 similar to the straight portion 18 and the inclined portion 19 of the outer mold 15 are formed on the outer peripheral surface of the annular mold body 20 a forming the annular shape of the inner mold 20. Is provided. Then, a spline shaft 32 shown in FIG. 5 is forged by pushing a cylindrical material (not shown) into the gap between the outer mold 15 and the inner mold 20 from the inclined portion 19 side.

  The straight portion 18 and the inclined portion 19 are ground by a grinding wheel 23 shown in FIG. On both the left and right sides of the tip of the grinding wheel 23, there are provided inclined grinding surfaces 23a for grinding the to-be-ground slopes 18a and 19a of the straight portion 18 and the inclined portion 19. A top grinding surface 23b for grinding the ground top surfaces 18b and 19b is formed on the outer peripheral surface of the tip of the grinding wheel 23. Grinding of the to-be-ground slope 18a or the to-be-ground top surface 18b of the straight part 18 can be easily performed by translating the grinding wheel 23 in the direction of the central axis O based on movement path data set in advance. it can. In addition, although the curved surface of the top surface 19b to be ground of the inclined portion 19 changes two-dimensionally, the movement path data of the grinding wheel 23 can be easily set in accordance with this, and the grinding wheel 23 is moved by NC command control. Thus, the grinding top surface 19b can be ground.

  The slope 19 a to be ground of the inclined portion 19 continuously decreases as the inclination angle β with respect to the inner peripheral surface 15 b goes to the tip of the inclined portion 19. That is, when the inclination angle β of the to-be-ground slope 19a changes, the line contact portion between the slope 19a and the inclined grinding surface 23a of the grinding wheel 23 changes in a three-dimensional curved surface. However, conventionally, it has been impossible to automatically perform grinding by properly bringing the inclined grinding surface 23a of the grinding wheel 23 into line contact with the changing slope 19a to be ground. For this reason, the operator changes the positional relationship between the outer mold 15 displayed on the display screen of the display device and the inclined grinding surface 23a of the grinding wheel 23, that is, the change in the inclination angle β of the inclined surface 19a of the inclined portion 19. While visually confirming, the three-axis moving mechanism of the grinding wheel 23 is manually operated so that the inclined grinding surface 23a of the grinding wheel 23 is always in proper line contact with the ground surface 19a to be ground. . That is, as shown in FIG. 9, the rotational axis L of the grinding wheel 23 is two-dimensionally changed to become the central axis L ′ in accordance with the small inclination angle β of the inclined surface 19 a of the inclined portion 19. Then, before the slanted ground surface 23a that is in line contact with the ground surface 19a to be ground is brought into contact with the ground surface 19a, another ground surface 23a that should not be contacted is ground on the straight portion 18 side. Interfering with the inclined surface 19a, the proper line contact is not performed, and the grinding operation cannot be performed properly. Therefore, in order to avoid the above-described interference, as shown in FIG. 10, the operator tilts the grinding wheel 23 so that the inclined grinding surface 23a is properly in line contact with the ground surface 19a. I was trying to operate it manually.

  However, since the conventional grinding method of the slope 19a to be ground of the inclined portion 19 is performed with the intuition of a skilled operator, the grinding work takes longer time and the work grinding work efficiency is improved. There was a problem that could not. In addition, since it is performed manually, there is a problem that the grinding accuracy of the ground surface 19a to be ground cannot be improved.

  On the other hand, what was disclosed by patent document 1 is proposed as a grinding machine of a workpiece | work. This grinding machine controls the relative position between the grinding wheel and the workpiece to grind the workpiece. The grinding machine includes a work table that supports a work and a dummy work and is movable relative to the grinding wheel in the X and Y axis directions. The grinding machine also includes a grinding wheel for grinding the workpiece and the dummy workpiece, a camera for imaging the tip shape of the grinding wheel transferred to the dummy workpiece by the grinding wheel, and an image captured by the camera. And an image data memory for storing the image data of the tip shape. The grinding machine has a shape data memory for storing workpiece shape data, and displays the workpiece shape on the display screen based on the data stored in the shape data memory, and is stored in the image data memory. Display means for displaying the tip shape of the grinding wheel based on the image data on the display screen. Further, the grinding machine includes a screen operating means for moving the tip shape of the grinding wheel with respect to the processing shape of the workpiece in the display screen, and the tip shape of the grinding wheel with respect to the processing shape of the workpiece. NC data is generated by determining the movement path of the grinding wheel with respect to the workpiece based on the teaching data memory for sequentially storing the data of the teaching position when sequentially touching and the teaching position data stored in the teaching data memory. NC program generating means for performing Further, the grinder is provided with NC control means for controlling the grinder by the generated NC program.

JP 2001-105119 A

  However, the grinding machine disclosed in Patent Document 1 can improve the grinding accuracy of the workpiece, but has the following problems. That is, there is a problem that the preparation work is troublesome because the dummy work is ground by the grinding wheel and the tip shape of the grinding wheel transferred to the dummy work is imaged by the camera. The teaching position when the tip shape of the grinding wheel is sequentially brought into contact with the processing shape of the workpiece by moving the tip shape of the grinding wheel with respect to the processing shape of the workpiece within the display screen by the screen operation means. Since the above data are sequentially stored in the teaching data memory, there is a problem that the work of acquiring the teaching position data is very troublesome.

  The present invention is based on the tip shape data of the grinding wheel and the machining shape data of the workpiece, and the movement path of the grinding wheel relative to the workpiece grinding slope even if the inclination angle of the workpiece grinding slope changes in a three-dimensional curved surface. An object is to provide a workpiece grinding method and a grinding machine capable of easily calculating data, a calculation program for moving path data used therefor, and a storage medium thereof.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a grindstone that is supported by a work table and has a workpiece to be ground that has a three-dimensional curved surface whose inclination angle changes and an inclined grinding surface at the tip. In a grinding method for grinding a workpiece by moving relative to a vehicle, a step of storing tip shape data of a grinding wheel in a storage medium, and a processing shape data of the slope to be ground of the workpiece are stored in a storage medium A step of calculating movement path data of the grinding wheel with respect to the workpiece based on the process, the tip shape data and the machining shape data; and a work by controlling relative movement of the work table and the grinding wheel based on the movement path data. The movement path data is calculated so that the inclined grinding surface of the grinding wheel is in proper line contact with the ground surface to be ground of the workpiece. The grit is that the slant grinding surface other than the slant grinding surface that is normally brought into contact with the ground surface to be ground among the slant grinding surfaces of the grinding wheel is to avoid interference with the ground surface to be ground. To do.

  According to the second aspect of the present invention, a workpiece having a slope to be ground that is supported by a work table and whose inclination angle changes in a three-dimensional curved surface and a grinding wheel having an inclined grinding surface at the tip are relatively moved to move the workpiece. In a grinding machine that performs grinding, a storage medium that stores tip shape data of a grinding wheel, a storage medium that stores processing shape data of a ground surface to be ground of a workpiece, and the tip shape data and processing shape data, The movement path data calculating means for calculating the movement path data of the grinding wheel, and the operation command means for controlling the relative movement of the work table and the grinding wheel on the basis of the movement path data, and grinding the workpiece. The route data calculation means is arranged so that the inclined grinding surface of the grinding wheel is properly in line contact with the ground surface to be ground of the workpiece, that is, the correct grinding surface of the grinding wheel. Wherein the gist of the inclined ground surface other than the inclined ground surface is contact with the ground slope is a function to avoid interfering with the to be ground slopes to.

  The invention described in claim 3 is the invention according to claim 2, wherein the workpiece is a cylindrical mold, and a plurality of protrusions for forming a spline shaft are formed on an inner peripheral surface of the mold body. Each protrusion is formed in a predetermined pitch, and each protrusion has a trapezoidal cross section. Each protrusion has a straight portion where the cross-sectional shape does not change, and the height of the protrusion is reduced, and the slopes of the slopes to be ground on both the left and right sides And the slopes to be ground of the straight part and the slopes to be ground of the sloped part are stored in a storage medium as work shape data of the workpiece, and the left and right sides of the tip of the grinding wheel are The gist is that an inclined ground surface for grinding the ground surface to be ground is stored in a storage medium as tip shape data.

  According to a fourth aspect of the present invention, in the second or third aspect, the tip shape data of the grinding wheel is converted into tip shape three-dimensional coordinate data by a three-dimensional coordinate data conversion unit, and the workpiece shape data is processed. The shape three-dimensional coordinate data conversion unit converts the data into machining shape three-dimensional coordinate data, and the movement path data calculation means calculates movement path data based on the tip shape three-dimensional coordinate data and the machining shape three-dimensional coordinate data. It is summarized as follows.

  According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the X-axis moving body is mounted on the upper surface of the bed so as to be able to reciprocate in the horizontal X-axis direction. On the upper surface, the work table is mounted so as to be able to turn in the C-axis direction around the vertical Z-axis orthogonal to the horizontal X-axis direction, and the grinding wheel reciprocates in the horizontal Y-axis direction orthogonal to the X-axis and Z-axis. The gist of the present invention is that it is mounted so as to be capable of turning in the B-axis direction around the Y-axis.

  Invention of Claim 6 is a program used for the grinding machine as described in any one of Claims 2-5, Comprising: The process which memorize | stores the tip shape data of a grinding wheel in a storage medium, The said workpiece | work The step of storing the machining shape data of the to-be-ground slope in a storage medium, the step of calculating the movement route data of the grinding wheel with respect to the workpiece based on the tip shape data and the machining shape data, and the calculation of the movement route data are as follows: The inclined grinding surface of the grinding wheel is properly in line contact with the ground surface to be ground of the workpiece, that is, the inclined grinding surface that is normally in contact with the ground surface to be ground among the inclined grinding surfaces of the grinding wheel. The gist of the present invention is that it is carried out so as to avoid an inclined grinding surface other than that from interfering with the ground surface to be ground.

The gist of the invention described in claim 7 is a storage medium storing the calculation program of the movement route data of claim 6.
(Function)
In this invention, the movement path data of the grinding wheel with respect to the ground surface to be ground of the workpiece is calculated by the movement path data calculating means based on the tip shape data of the grinding wheel and the machining shape data of the workpiece. That is, the inclined grinding surface of the grinding wheel is properly brought into line contact with the grinding surface of the workpiece by the movement path data calculation means, that is, the grinding surface of the grinding wheel is properly grounded. The movement path data is calculated so as to avoid an inclined grinding surface other than the inclined grinding surface in contact with the ground to be ground.

  According to the present invention, on the basis of the tip shape data of the grinding wheel and the machining shape data of the workpiece, the movement path data of the grinding wheel with respect to the ground to be ground of the workpiece in which the inclination angle of the ground to be ground changes in a three-dimensional curved surface is obtained. It can be easily calculated.

The block circuit diagram of the control system of the grinding machine of this invention. FIG. 3 is a schematic front sectional view of a grinding machine. The partial expanded plane sectional view for demonstrating the grinding | polishing operation | work of the protrusion of a metal mold | die. The partial expanded plane sectional view for demonstrating the grinding operation | work of the protrusion of a metal mold | die similarly. The cross-sectional view of a spline shaft. The front view of a metal mold | die. The partial expansion perspective view of an outer side metal mold | die. The partial front view for demonstrating the grinding method of the slope of the straight part formed in the metal mold | die. The partial front view for demonstrating the grinding method based on the manual operation of the slope of the inclined part formed in the metal mold | die. The partial front view for demonstrating the grinding method of the inclined surface of the inclination part based on manual operation. (A)-(c) is a partial front view which shows another embodiment of the shape of the front-end | tip part of a grinding wheel.

  Hereinafter, an embodiment of a grinding machine embodying the present invention will be described with reference to FIGS. The workpiece in this embodiment is the same outer mold as the outer mold 15 shown in FIGS. 6 and 7 described in the background art. First, the grinding machine will be described with reference to FIG.

  An X-axis moving body 11 that is reciprocated in the X-axis (left and right in FIG. 2) direction by the X-axis moving mechanism 12 is mounted on the upper surface of the bed 10. On the upper surface of the X-axis moving body 11, a work table 13 is mounted that is turned in the horizontal direction around the Z-axis directed in the C-axis direction, that is, the vertical direction by the C-axis moving mechanism. The mold 15 is supported on the upper surface of the work table 13 via a support jig 16.

  A triaxial moving body 21 is mounted on the upper surface of the bed 10 via a column and a guide mechanism (not shown). A grinding wheel 23 that is the same as the grinding wheel 23 described in the background art is rotatably supported by a lower end portion of the triaxial moving body 21 via a shaft 22. The triaxial moving body 21 is reciprocated by a Y axis moving mechanism 24 in a Y axis direction (horizontal direction perpendicular to the paper surface) perpendicular to the X axis in FIG. The triaxial moving body 21 is reciprocated in the Z axis (vertical) direction by a Z axis moving mechanism 25. Further, the triaxial moving body 21 is reciprocally moved in the B-axis direction that pivots in the vertical direction around the Y-axis by the B-axis moving mechanism 26.

  The triaxial moving body 21 is provided with a drive mechanism for rotating the grinding wheel 23. The drive mechanism will be described. A motor 27 is attached to the upper end of the triaxial moving body 21, and a drive pulley 29 is connected to the output shaft 28 of the motor 27. A driven pulley 30 is connected to the shaft 22 connected to the grinding wheel 23, and a belt 31 is hung on the driving pulley 29 and the driven pulley 30. When the motor 27 is driven, the grinding wheel 23 is rotated via the drive pulley 29, the belt 31, the driven pulley 30, and the like.

Next, a control system for the grinding machine will be described with reference to FIG.
The control device 41 as the operation command means includes a central processing unit (CPU) 42. The CPU 42 is connected to a read-only read-only memory (ROM) 43 in which various operation programs for grinding work are recorded in advance. The CPU 42 is connected to a random access memory (RAM) 44 as a readable / writable storage medium for storing various data. The RAM 44 includes a tip shape data memory 45 for storing tip shape data D23 of the grinding wheel 23 (referred to collectively as shape data of the inclined grinding surface 23a and the top grinding surface 23b). The RAM 44 also includes a machining shape data memory 46 for storing machining shape data D15 of the surface to be ground of the outer mold (generally called machining shape data of the inclined surfaces 18a and 19a and the top surfaces 18b and 19b). ing.

  For example, an input device 47 for inputting various data such as the tip shape data D23 or the machining shape data D15 is connected to the CPU. A display means 48 is connected to the CPU 42. The display means 48 can display, for example, the tip shape of the grinding wheel 23 or the shape of each part of the protrusion 17 of the outer mold visually. Is provided. The CPU 42 is connected to the servo motor M12 of the X-axis moving mechanism 12, the C-axis moving mechanism 14, the Y-axis moving mechanism 24, the Z-axis moving mechanism 25, and the B-axis moving mechanism 26 described above via a data bus and a drive circuit (not shown). , M14, M24, M25, and M26 are connected.

Next, various functions of the CPU 42 will be described.
The CPU 42 is provided with a tip shape three-dimensional coordinate data conversion unit 51 for converting the tip shape data D23 of the grinding wheel 23 stored in the tip shape data memory 45 into tip shape three-dimensional coordinate data D23A. Yes. Further, the CPU 42 is provided with a machining shape three-dimensional coordinate data conversion unit 52 for converting the machining shape data D15 of the grinding wheel 23 stored in the machining shape data memory 46 into the machining shape three-dimensional coordinate data D15A. Yes.

  The CPU 42 has a movement path data calculation means for calculating movement path data D23B (details will be described later) of the grinding wheel 23 based on the tip shape three-dimensional coordinate data D23A and the machining shape three-dimensional coordinate data D15A. The movement route data calculation unit 53 is provided. The movement route data calculation unit 53 performs the following calculation operation. That is, the inclined surface 19a of the inclined portion 19 has an inclination angle β that decreases continuously in the direction of the central axis O of the outer mold 15, and the inclined surface 19a and the inclined grinding surface 23a of the grinding wheel 23 The line contact portion changes in a three-dimensional curved surface. In this specification, it is synonymous with “the line contact portion changes in a three-dimensional curved surface” and is expressed as “the inclination angle β of the to-be-ground slope 19a changes in a three-dimensional curved surface” depending on the case. Therefore, the inclined grinding surface 23a of the grinding wheel 23 is always in line contact with the ground surface 19a to be ground at any position in the direction of the central axis O of the outer mold 15 (actually in contact with a strip-like elongated region). Thus, the movement route data D23B is calculated. That is, the movement path data D23B is data that does not interfere with the ground surface 19a of the inclined portion 19 on the straight portion 18 side that the inclined grinding surface 23a of the grinding wheel 23 should not be in contact with. More specifically, the degree of interference of the inclined grinding surface 23a of the grinding wheel 23 with the grinding surface 19a of the inclined portion 19 can be calculated based on the tip shape three-dimensional coordinate data D23A and the machining shape three-dimensional coordinate data D15A. it can. Accordingly, the movement path data D23B is calculated by the movement path data calculation unit 53 so as to cancel the interference degree.

  The CPU 42 is provided with an NC command data calculation unit 54 for outputting an operation command to each of the motors M12, M14, M24 to M26 based on the movement path data D23B. By this NC command data, the relative movement of the work table 13 and the grinding wheel 23 is controlled in the five-axis direction described above, and the outer mold protrusion 17 is ground.

Next, the grinding operation of the outer mold ridge 17 by the grinding machine configured as described above will be described.
First, using the input device 47 shown in FIG. 1, the side surface shape data D23a and the top surface shape data D23b of the inclined grinding surface 23a and the top surface grinding surface 23b of the grinding wheel 23 are used as the tip shape data D23 of the grinding wheel 23. Are stored in advance in the tip shape data memory 45. Further, the slope shape data D18a and the top face shape data D18b of the slope 18a and the top face 18b of the straight portion 18 shown in FIG. Further, the machining shape data D19a and the machining shape data D19b of the slope 19a and the top surface 19b of the inclined portion 19 are stored in the machining shape data memory 46 in advance.

  Next, by operating the input device 47, the tip shape three-dimensional coordinate data conversion unit 51 is operated to convert the tip shape data D23 stored in the tip shape data memory 45 into tip shape three-dimensional coordinate data D23A. . Similarly, by operating the input device 47, the machining shape three-dimensional coordinate data conversion unit 52 is operated to convert the machining shape data D15 stored in the machining shape data memory 46 into machining shape three-dimensional coordinate data D15A. To do.

  Next, the movement path data calculation unit 53 is operated by operating the input device 47, and the movement path data D23B is calculated based on the tip shape three-dimensional coordinate data D23A and the machining shape three-dimensional coordinate data D15A.

  The movement path data D23B is the first movement path data D231 for continuously grinding the slope 18a on the left side of the straight part 18 and the slope 19a to be ground on the left side of the inclined part 19 with respect to one ridge 17 shown in FIG. The second movement path data D232 for continuously grinding the top surface 18b and the top surface 19b, the right slope 18a of the straight portion 18, and the ground slope 19a on the right side of the slope 19 are continuously ground. It is divided into third movement route data D233. When the calculation operation of the first to third movement route data D231 to D233 is completed, the NC command data calculation unit 54 is activated, and the first to third NC command data of the grinding wheel 23 is based on the movement route data D231 to D233. Is calculated. Based on these NC command data, the work table 13 and the grinding wheel 23 are relatively moved in the 5-axis direction. For example, by the NC command data related to the first movement path data D231, the straight portion 18 of the outer mold shown in FIG. The left inclined surface 18a and the left inclined surface 19a of the inclined portion 19 are appropriately ground by the inclined grinding surface 23a. 3 shows a state where the inclined surface 18a of the straight portion 18 is ground by the inclined grinding surface 23a of the grinding wheel 23, and FIG. 4 shows that the inclined surface 19a of the inclined portion 19 is ground by the inclined grinding surface 23a. Indicates the state.

According to the grinding machine of the said embodiment, the following effects can be acquired.
(1) In the above embodiment, as shown in FIG. 7, the tip shape data D23 of the grinding wheel 23 stored in the tip shape data memory 45 and the machining shape data of the outer mold stored in the machining shape data memory 46. D15 is converted into tip shape three-dimensional coordinate data D23A and machining shape three-dimensional coordinate data D15A, respectively. And based on both coordinate data D23A and D15A, the movement route data D23B (the 1st-3rd movement route data D231-D233) of the grinding wheel 23 were calculated. That is, the inclined grinding surface 23a of the grinding wheel 23 is properly line-contacted with the grinding slope 19a in which the inclination angle β of the inclined portion 19 of the outer mold 15 changes in a three-dimensional curved surface, that is, The inclined grinding surface 23a of the grinding wheel 23 other than the inclined grinding surface 23a that is normally brought into contact with the to-be-ground slope 19a is prevented from interfering with the to-be-ground slope 19a. For this reason, the grinding operation by the grinding wheel 23 of the to-be-ground slope 19a in which the inclination angle β changes in a three-dimensional curved surface can be easily performed.

  (2) In the above embodiment, as shown in FIG. 2, the outer mold 15 is controlled to move in the X-axis direction and the C-axis direction by the X-axis moving mechanism 12 and the C-axis moving mechanism 14, respectively, and the three-axis moving body 21 and the grinding wheel 23 are controlled to move in the Y-axis direction, the Z-axis direction, and the B-axis direction by the Y-axis moving mechanism 24, the Z-axis moving mechanism 25, and the B-axis moving mechanism 26, respectively. Therefore, for example, even when the inclination angle β of the slope 19a to be ground of the inclined portion 19 of the outer mold changes in a complicated manner, the relative movement control of the work table 13 and the grinding wheel 23 is easily performed, and the outer mold 15 is controlled. Can be properly ground.

In addition, you may change the said embodiment as follows.
As shown in FIG. 11 (a), the tip shape of the grinding wheel 23 is made into a semicircular grinding part 23c, or as shown in FIG. 11 (b), it is formed into a mountain shape by the inclined grinding surface 23a. As shown, it may be formed by one inclined grinding surface 23a and one top grinding surface 23b. In this way, a plurality of types of tip shapes of the grinding wheel 23 are prepared, and a plurality of types of tip shape data are stored in the storage medium in advance, and when the grinding wheel 23 is changed, a plurality of types of tip shapes are stored. You may make it selectable from shape data.

  In the above embodiment, the calculation program for the movement path data is generated by the control device 41 provided in the grinding machine. However, the calculation program for the movement path data is given to a personal computer unrelated to the grinding machine, The calculated movement route data may be transmitted to the control device 41 of the grinding machine by a storage medium, or by wire or wirelessly.

  When the movement route data of the grinding wheel 23 is calculated by the movement route data calculation unit 53, it passes through the planned grinding line where the inclination angle β of the inclined surface 19a of the inclined portion 19 changes and is orthogonal to the inclined surface 19a. The axis of rotation of the grinding wheel 23 may be positioned on the vertical coordinate plane.

  A program for grinding wheel movement path data used in the grinding machine, the step of storing the grinding wheel tip shape data in a storage medium, and the machining shape data of the workpiece to be ground on the storage medium. And a step of calculating the movement path data of the grinding wheel with respect to the workpiece based on the tip shape data and the machining shape data, and the calculation of the movement path data is performed on the grindstone of the workpiece with respect to the ground surface to be ground. In order for the slant grinding surface of the car to be in line contact properly, that is, among the slant grinding surfaces of the grinding wheel, slant grinding surfaces other than the slant grinding surface that are normally in contact with the ground slant interfere with the ground to be ground. You may embody as a calculation program of movement route data of a grinding wheel which is performed so that it may avoid. Further, the present invention may be embodied as a magnetic storage medium (flexible disk) storing the calculation program or a storage medium such as a USB memory.

  -You may embody in the grinding machine which carries out movement control of the grinding wheel 23 to the 3 axis directions of X, Y, and Z axis | shaft. Further, the present invention may be embodied in a grinding machine that controls the movement of the grinding wheel 23 in the four axis directions of the X, Y, Z, and C axes or the four axis directions of the X, Y, Z, and B axes.

  -For example, it may be embodied as a grinding machine for bevel gears.

  β ... tilt angle, Y, 23 ... grinding wheel, D15, D19a, D19b ... machining shape data, D23 ... tip shape data, D15A ... machining shape three-dimensional coordinate data, D23A ... tip shape three-dimensional coordinate data, D23B, D231- D233 ... Movement path data, 11 ... X-axis moving body, 13 ... Work table, 15 ... Mold, 17 ... Projection, 18 ... Straight part, 19 ... Inclined part, 19a ... Slope to be ground, 22 ... Axis, 23a ... Inclined grinding surface, 52... Machining shape three-dimensional coordinate data conversion unit.

Claims (7)

In a grinding method for grinding a workpiece by relatively moving a workpiece having a to-be-ground slope whose inclination angle is changed in a three-dimensional curved surface and a grinding wheel having an inclined grinding surface at the tip, supported by the work table,
Storing the tip shape data of the grinding wheel in a storage medium;
Storing machining shape data of the to-be-ground slope of the workpiece in a storage medium;
Based on the tip shape data and the machining shape data, calculating the movement path data of the grinding wheel relative to the workpiece,
A step of grinding the workpiece by controlling the relative movement of the work table and the grinding wheel based on the movement path data,
The movement path data is calculated so that the inclined grinding surface of the grinding wheel is properly in line contact with the ground surface to be ground of the workpiece, that is, the ground surface to be ground is properly out of the inclined grinding surface of the grinding wheel. A grinding method for a workpiece, characterized in that it is performed so as to avoid an inclined grinding surface other than the inclined grinding surface in contact with the ground to be ground. In a grinding machine that is supported by a work table and grinds a work by relatively moving a work having a to-be-ground slope whose inclination angle changes in a three-dimensional curved surface and a grinding wheel having an inclined grinding surface at the tip,
A storage medium for storing the tip shape data of the grinding wheel;
A storage medium for storing machining shape data of a workpiece to be ground;
Based on the tip shape data and the machining shape data, movement path data calculating means for calculating movement path data of the grinding wheel with respect to the workpiece,
Based on the movement path data, comprising an operation command means for controlling the relative movement of the work table and the grinding wheel and grinding the work,
The movement path data calculation means is configured so that the inclined grinding surface of the grinding wheel is properly in line contact with the ground surface to be ground of the workpiece, that is, the ground surface to be ground is properly out of the inclined grinding surface of the grinding wheel. A grinding machine having a function of preventing an inclined grinding surface other than the inclined grinding surface in contact with the ground surface to interfere with the grinding surface. In Claim 2, The said workpiece | work is a metal mold | die which makes a cylinder shape, Comprising: On the inner peripheral surface of the metal mold | die main body, several protrusions for shape | molding a spline shaft are formed in predetermined pitch, Each said Each ridge has a trapezoidal cross section, and each ridge has a straight portion where the cross section does not change, and the height decreases, and the inclination angle of the slopes to be ground on both the left and right sides decreases as it goes to the tip. Inclined grinding is performed by grinding the slope to be ground of the straight portion and the slope to be ground of the inclined portion in a storage medium as workpiece shape data, and grinding the slope to be ground on both the left and right sides of the tip of the grinding wheel. A grinding machine characterized in that a surface is stored in a storage medium as tip shape data. In claim 2 or 3, the tip shape data of the grinding wheel is converted into tip shape three-dimensional coordinate data by a three-dimensional coordinate data converter, and the workpiece shape data is converted by a machining shape three-dimensional coordinate data converter, It is converted into machining shape three-dimensional coordinate data, and the movement path data calculating means is configured to calculate movement path data based on the tip shape three-dimensional coordinate data and the machining shape three-dimensional coordinate data. A grinding machine. 5. The X-axis moving body is mounted on the upper surface of the bed so that the X-axis moving body can reciprocate in the horizontal X-axis direction. The grinding wheel is mounted so as to be pivotable in the C-axis direction around the vertical Z-axis orthogonal to the axial direction, and the grinding wheel is mounted so as to be able to reciprocate in the horizontal Y-axis direction orthogonal to the X-axis and Z-axis. A grinding machine characterized by being mounted so as to be pivotable in the B-axis direction around. A program used for the grinding machine according to any one of claims 2 to 5,
Storing the tip shape data of the grinding wheel in a storage medium;
Storing machining shape data of the to-be-ground slope of the workpiece in a storage medium;
Based on the tip shape data and the machining shape data, calculating the movement path data of the grinding wheel relative to the workpiece,
The movement path data is calculated so that the inclined grinding surface of the grinding wheel is properly in line contact with the ground surface to be ground of the workpiece, that is, the ground surface to be ground is properly out of the inclined grinding surface of the grinding wheel. A program for calculating movement path data used for a grinding machine, wherein the grinding is performed so as to avoid an inclined grinding surface other than the inclined grinding surface in contact with the ground to be ground. The storage medium which memorize | stored the calculation program of the movement route data of Claim 6.

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