Dressing device for grindstone, dressing method for grindstone, and control program

Abstract

To provide a dressing device for a grindstone, a dressing method for a grindstone, and a control program that can obtain more uniform sharpness over the entire grindstone surface.SOLUTION: A dressing device includes: a grindstone holding unit 30 capable of rotating a grindstone 12; a dresser holding unit 40 capable of holding a dresser 36 for dressing the grindstone 12; a moving mechanism unit 70 that moves at least one of the grindstone holding unit 30 and the dresser holding unit 40 so that the dresser 36 and the grindstone 12 are scanned relative to each other; and a control device 51 that controls the moving mechanism unit 70 so that when the dresser 36 contacts a large-diameter portion 210 of the grindstone surface 21, the dresser 36 and the grindstone 12 are scanned relative to each other at a first speed, and when the dresser 36 contacts a small-diameter portion 220 of the grindstone surface 21, the dresser 36 and the grindstone 12 are scanned relative to each other at a second speed higher than the first speed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a dressing device for a grinding wheel, a dressing method for a grinding wheel, and a control program.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2023-55160 (Patent Document 1) discloses a grinding machine including a circular grinding wheel that is rotationally driven by an electric motor and a diamond dresser for dressing the outer peripheral surface of the grinding wheel that functions as a grinding surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As disclosed in the above Patent Document 1, a grinding wheel is used to perform grinding of a workpiece. In such a grinding wheel, when the diameter of the grinding wheel surface centered on the rotation center axis of the grinding wheel changes along the axial direction of the rotation center axis, the peripheral speed of the small-diameter portion of the grinding wheel surface becomes smaller than the peripheral speed of the large-diameter portion of the grinding wheel surface. As a result, the cutting edge of the small-diameter portion of the grinding wheel surface becomes worse than that of the large-diameter portion of the grinding wheel surface, and as a result, the surface of the workpiece ground by the small-diameter portion becomes rough, or chattering vibration is likely to occur during grinding by the small-diameter portion.

[0005] An object of this invention is to provide a dressing device for a grinding wheel, a dressing method for a grinding wheel, and a control program that can obtain a more uniform cutting edge throughout the grinding wheel surface.

Means for Solving the Problems

[0006] The dressing device for a grinding wheel according to the present invention includes a grinding wheel holding part that extends around a predetermined axis and holds a grinding wheel having a grinding wheel surface with a diameter that changes around the predetermined axis, and is capable of rotating the grinding wheel around the predetermined axis; a dresser holding part that can hold a dresser for dressing the grinding wheel; a moving mechanism part that moves at least one of the grinding wheel holding part and the dresser holding part so that the dresser and the grinding wheel are relatively scanned; and a control device that controls the moving mechanism part so that when the dresser contacts the large-diameter part of the grinding wheel surface, the dresser and the grinding wheel are relatively scanned at a first speed, and when the dresser contacts the small-diameter part of the grinding wheel surface, the dresser and the grinding wheel are relatively scanned at a second speed greater than the first speed.

[0007] The dressing method for a grinding wheel according to the present invention is a method of dressing a grinding wheel that extends around a predetermined axis and has a grinding wheel surface with a diameter that changes around the predetermined axis, using a dresser. The dressing method for the grinding wheel includes a step of rotating the grinding wheel around the predetermined axis and relatively scanning the dresser and the grinding wheel at a first speed while bringing the dresser into contact with the large-diameter part of the grinding wheel surface, and a step of rotating the grinding wheel around the predetermined axis and relatively scanning the dresser and the grinding wheel at a second speed greater than the first speed while bringing the dresser into contact with the small-diameter part of the grinding wheel surface.

[0008] The control program according to the present invention is a control program for a dressing device that dresses a grinding wheel that extends around a predetermined axis and has a grinding wheel surface with a diameter that changes around the predetermined axis, using a dresser. The control program causes the dressing device to execute a step of rotating the grinding wheel around the predetermined axis and relatively scanning the dresser and the grinding wheel at a first speed while bringing the dresser into contact with the large-diameter part of the grinding wheel surface, and a step of rotating the grinding wheel around the predetermined axis and relatively scanning the dresser and the grinding wheel at a second speed greater than the first speed while bringing the dresser into contact with the small-diameter part of the grinding wheel surface.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a dressing device for a grinding wheel that enables uniform dressing of the grinding wheel surface, a dressing method for the grinding wheel, and a control program.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same reference numerals.

[0012] FIG. 1 is a front view showing a dressing device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control system related to the dressing process of the grinding wheel in the dressing device of FIG. 1.

[0013] Referring to FIGS. 1 and 2, the dressing device 100 is a device capable of dressing a grinding wheel 12 used for grinding a workpiece.

[0014] The grinding wheel 12 has a grinding wheel portion 16 and a shank portion 17. The shank portion 17 is made of metal and extends axially as a whole around a predetermined axis 160. The predetermined axis 160 is an imaginary straight line corresponding to the rotation center axis of the grinding wheel 12. The grinding wheel portion 16 is composed of high-hardness granular abrasive grains that exhibit the function of a grinding wheel and a binder that exhibits the function of binding the abrasive grains together. The grinding wheel portion 16 is connected to one end portion of the shank portion 17 in the axial direction with respect to the predetermined axis 160.

[0015] The grinding wheel portion 16 has a grinding wheel surface 21. The grinding wheel surface 21 is the surface of the grinding wheel portion 16 that comes into contact with the workpiece during the grinding process of the workpiece by the grinding wheel 12. The grinding wheel surface 21 extends around the predetermined axis 160. The diameter of the grinding wheel surface 21 centered on the predetermined axis 160 varies along the axial direction of the predetermined axis 160. The grinding wheel surface 21 (each of the first grinding wheel surface 21A and the second grinding wheel surface 21B described later) is composed of a conical surface centered on the predetermined axis 160. The grinding wheel surface 21 may have a shape that extends while curving along the axial direction of the predetermined axis 160 and protrudes outward in the radial direction of the predetermined axis 160.

[0016] The grinding wheel surface 21 includes a first grinding wheel surface 21A and a second grinding wheel surface 21B. The first grinding wheel surface 21A and the second grinding wheel surface 21B are continuous in the axial direction of the predetermined axis 160. The second grinding wheel surface 21B is disposed between the first grinding wheel surface 21A and the shank portion 17 in the axial direction of the predetermined axis 160. The diameter of the first grinding wheel surface 21A centered on the predetermined axis 160 becomes smaller as it moves away from the second grinding wheel surface 21B in the axial direction of the predetermined axis 160. The diameter of the second grinding wheel surface 21B centered on the predetermined axis 160 becomes larger as it approaches the first grinding wheel surface 21A in the axial direction of the predetermined axis 160.

[0017] The diameter of the grinding wheel surface 21 centered on the predetermined axis 160 is maximum at the boundary between the first grinding wheel surface 21A and the second grinding wheel surface 21B. As an example, the length of the first grinding wheel surface 21A in the axial direction of the predetermined axis 160 is larger than the length of the second grinding wheel surface 21B in the axial direction of the predetermined axis 160. Each of the first grinding wheel surface 21A and the second grinding wheel surface 21B is inclined at 45° with respect to the predetermined axis 160.

[0018] The dressing device 100 includes a grinding wheel holding unit 30, a dresser holding unit 40, and a moving mechanism unit 70. The grinding wheel holding unit 30 can hold the grinding wheel 12. The grinding wheel holding unit 30 can rotate the grinding wheel 12 about a predetermined axis 160. The dresser holding unit 40 can hold a dresser 36 for dressing the grinding wheel 12. The moving mechanism unit 70 moves at least one of the grinding wheel holding unit 30 and the dresser holding unit 40 so that the dresser 36 and the grinding wheel 12 are relatively scanned.

[0019] In the present embodiment, the dressing device 100 is composed of a composite machining machine 101 equipped with both a milling function for machining a workpiece by bringing a rotating tool into contact with a stationary workpiece and a turning function for machining a workpiece by bringing a tool into contact with a rotating workpiece.

[0020] Hereinafter, a more specific configuration of the dressing device 100 will be described in light of the configuration of the composite machining machine 101.

[0021] The composite machining machine 101 is an NC (Numerically Controlled) machine tool in which various operations for workpiece machining are automated by numerical control by a computer.

[0022] In this specification, for the sake of convenience in explaining the configuration of the composite machining machine 101, an axis parallel to the rotation axis of the workpiece and extending in the horizontal direction is referred to as the "Z-axis", an axis orthogonal to the Z-axis and extending in the horizontal direction is referred to as the "Y-axis", and an axis extending in the vertical direction is referred to as the "X-axis".

[0023] The composite machining machine 101 includes a workpiece spindle 41, a tool spindle (upper tool rest) 31, and a tool rest (lower tool rest) not shown. The workpiece spindle 41, the tool spindle 31, and the tool rest (not shown) are arranged in the machining area 105. The machining area 105 is a space where workpiece machining is performed, and is sealed by a cover body (not shown) so that foreign matters such as chips or cutting oil accompanying workpiece machining do not leak outside the machining area 105.

[0024] The work spindle 41 is capable of holding a work. The work spindle 41 is rotationally driven by a motor about a rotation center axis 110 extending in the Z-axis direction.

[0025] The work spindle 41 has a chuck 42. The chuck 42 detachably holds the work. The chuck 42 has a chuck main body portion 43 and a plurality of claw portions 44. The chuck main body portion 43 has a cylindrical shape centered on the rotation center axis 110. The chuck main body portion 43 has an end face 43a. The end face 43a consists of a plane orthogonal to the rotation center axis 110.

[0026] The plurality of claw portions 44 are attached to the chuck main body portion 43 at intervals in the circumferential direction of the rotation center axis 110. The plurality of claw portions 44 project in the Z-axis direction from the end face 43a. Each claw portion 44 is slidably driven in the radial direction of the rotation center axis 110 by hydraulic pressure or the like. The plurality of claw portions 44 grip the outer peripheral surface of the work by sliding inward in the radial direction of the rotation center axis 110, or grip the inner peripheral surface of the work by sliding outward in the radial direction of the rotation center axis 110.

[0027] The work spindle 41 holds a dresser 36. In the present embodiment, the dresser holding portion 40 is constituted by the work spindle 41.

[0028] The dresser 36 is attached to the chuck main body portion 43 via a dresser mounting base 37. The dresser mounting base 37 is attached to the end face 43a of the chuck main body portion 43. The dresser mounting base 37 is disposed on the outer side in the radial direction of the rotation center axis 110 than the plurality of claw portions 44.

[0029] The dresser 36 is composed of a point dresser having a tip portion curved in a semicircular shape. The dresser 36 is, for example, made of diamond. The dresser 36 includes a first dresser 36A and a second dresser 36B. The first dresser 36A protrudes outward in the radial direction of the rotation center axis 110 from the dresser mounting base 37. The second dresser 36B protrudes along the Z-axis direction from the dresser mounting base 37. The first dresser 36A is used for dressing the first grinding surface 21A. The second dresser 36B is used for dressing the second grinding surface 21B.

[0030] Note that the composite machining machine 101 may further include an opposing work spindle at a position facing the work spindle 41 in the Z-axis direction. The dresser 36 is not limited to the work spindle 41 and may be held, for example, by an opposing work spindle, or may be held by a cover body surrounding the working area 105, or may be held by a tool rest (not shown).

[0031] The tool spindle 31 is capable of holding a tool. The tool spindle 31 is rotationally driven by a motor about a rotation center axis 120 parallel to the X-axis in a reference posture described later. The tool spindle 31 incorporates a clamp mechanism (not shown) for detachably holding the tool.

[0032] The tool spindle 31 is further provided so as to be pivotable about a pivot center axis 130 parallel to the Y-axis (B-axis pivot). The pivot center axis 130 intersects the rotation center axis 120. The pivot range of the tool spindle 31 is, for example, in the range of ±120° with respect to a reference posture in which the spindle end face 31a of the tool spindle 31 faces downward. In FIG. 1, the tool spindle 31 pivoted 45° clockwise about the pivot center axis 130 from the reference posture is shown.

[0033] The tool spindle 31 can further hold the grinding wheel 12. In the present embodiment, the dresser holding portion 40 is constituted by the tool spindle 31. When the shank portion 17 is clamped by a clamping mechanism built in the tool spindle 31, the grinding wheel 12 is held by the tool spindle 31. When the grinding wheel 12 is held by the tool spindle 31, the rotation center axis 120 and the predetermined axis 160 extend in a straight line.

[0034] The tool spindle 31 is movable in the X-axis direction, Y-axis direction, and Z-axis direction by a movement mechanism portion 70. The movement mechanism portion 70 is constituted by various feed mechanisms, guide mechanisms, and servo motors (tool spindle feed motor 62 in FIG. 2).

[0035] The tool rest (not shown) can hold tools. The tool rest is of a so-called turret type, and a plurality of tools are radially attached and perform indexing rotation. The tool rest is movable in the Z-axis direction and X-axis direction by various feed mechanisms, guide mechanisms, and servo motors. Therefore, when the dresser 36 is held by the tool rest, it is possible to move the dresser 36 within the Z-axis - X-axis plane.

[0036] The multi-functional machine 101 also functions as a grinding device for grinding a workpiece. As an example of the grinding process, the tool spindle 31 is rotated 45° clockwise about the rotation center axis 130 from the reference posture, and the outer peripheral surface of the cylindrical workpiece held by the workpiece spindle 41 is ground using the first grinding wheel surface 21A. The tool spindle 31 is rotated 45° counterclockwise about the rotation center axis 130 from the reference posture, and the end surface of the cylindrical workpiece held by the workpiece spindle 41 is ground using the second grinding wheel surface 21B.

[0037] The multi-functional machine 101 (dressing device 100) further includes a control device 51. The control device 51 controls the operation of the multi-functional machine 101.

[0038] Each component of the control device 51 is realized by hardware including an arithmetic unit such as a CPU (Central Processing Unit) and various computer processors, a storage device such as a memory or a storage, and a wired or wireless communication line connecting them, and software stored in the storage device and supplying processing instructions to the arithmetic unit. The computer program may be composed of a device driver, an operating system, various application programs located in upper layers thereof, or a library providing common functions to these programs.

[0039] The control device 51 includes a program storage unit 52, a program execution unit 53, a tool spindle control unit 54, and a work spindle control unit 55.

[0040] The program storage unit 52 stores an execution program for workpiece machining (control program of the multi-tasking machine 101) created by an operator of the multi-tasking machine 101. The program storage unit 52 is, for example, a flash memory.

[0041] The program execution unit 53 executes the execution program stored in the program storage unit 52. The program execution unit 53 reads the instructions of the execution program and outputs control signals to each of the tool spindle control unit 54 and the work spindle control unit 55.

[0042] The tool spindle control unit 54 controls a tool spindle turning motor 61 for turning the tool spindle 31 about the B axis, a tool spindle feed motor 62 for moving the tool spindle 31 in each of the X-axis direction, the Y-axis direction, and the Z-axis direction, and a tool spindle rotation motor 63 for rotating the tool spindle 31 about the rotation center axis 120 according to a control signal from the program execution unit 53. The work spindle control unit 55 controls a work spindle rotation motor 64 for rotating the work spindle 41 about the rotation center axis 110 according to a control signal from the program execution unit 53.

[0043] FIG. 3 is a front view showing an enlarged dressing process in the dressing device in FIG. 1. FIG. 4 is a graph showing the change in dressing speed in the dressing process in FIG. 3.

[0044] In the present invention, the dressing speed means the speed at which the dresser and the grinding wheel are relatively scanned. In this embodiment, the dressing speed corresponds to the feed speed of the tool spindle 31 (grinding wheel 12) in the Z-axis direction.

[0045] Referring to FIGS. 1 to 4, when the dresser 36 contacts the large-diameter portion 210 of the grinding wheel surface 21, the control device 51 controls the moving mechanism unit 70 so that the dresser 36 and the grinding wheel 12 are relatively scanned at the first speed, and when the dresser 36 contacts the small-diameter portion 220 of the grinding wheel surface 21, the dresser 36 and the grinding wheel 12 are relatively scanned at a second speed greater than the first speed.

[0046] In addition, the dressing method of the grinding wheel in this embodiment includes a step of rotating the grinding wheel 12 around a predetermined axis 160 and relatively scanning the dresser 36 and the grinding wheel 12 at the first speed while bringing the dresser 36 into contact with the large-diameter portion 210 of the grinding wheel surface 21, and a step of rotating the grinding wheel 12 around a predetermined axis 160 and relatively scanning the dresser 36 and the grinding wheel 12 at a second speed greater than the first speed while bringing the dresser 36 into contact with the small-diameter portion 220 of the grinding wheel surface 21.

[0047] In addition, the control program in this embodiment causes the complex processing machine 101 (dressing device 100) to execute a step of rotating the grinding wheel 12 around a predetermined axis 160 and relatively scanning the dresser 36 and the grinding wheel 12 at the first speed while bringing the dresser 36 into contact with the large-diameter portion 210 of the grinding wheel surface 21, and a step of rotating the grinding wheel 12 around a predetermined axis 160 and relatively scanning the dresser 36 and the grinding wheel 12 at a second speed greater than the first speed while bringing the dresser 36 into contact with the small-diameter portion 220 of the grinding wheel surface 21.

[0048] In FIG. 3, a process of dressing the first grinding surface 21A of the grinding wheel portion 16 using the first dresser 36A is shown. Hereinafter, the dressing method of the grinding wheel in the present embodiment will be described by taking the dressing process of the first grinding surface 21A using the first dresser 36A as an example.

[0049] As shown in FIG. 3, the first grinding surface 21A extends between a first position Pa and a second position Pb in the axial direction of the predetermined axis 160. The first position Pa is a position where the diameter of the first grinding surface 21A centered on the predetermined axis 160 is the largest, and the second position Pb is a position where the diameter of the first grinding surface 21A centered on the predetermined axis 160 is the smallest. The first grinding surface 21A is divided into two in the axial direction of the predetermined axis 160. Among them, the region including the first position Pa is shown as the large-diameter portion 210, and the region including the second position Pb is shown as the small-diameter portion 220. The diameter of the large-diameter portion 210 centered on the predetermined axis 160 is larger than the diameter of the small-diameter portion 220 centered on the predetermined axis 160.

[0050] As shown in FIGS. 1 to 4, in the dressing process of the first grinding surface 21A, first, the tool spindle control unit 54 controls the tool spindle turning motor 61 so that the tool spindle 31 turns clockwise by 45° about the turning center axis 130 from the reference posture.

[0051] Next, the tool spindle control unit 54 controls the tool spindle feed motor 62 so that the tip of the first dresser 36A approaches the first position Pa of the first grinding surface 21A. The tool spindle control unit 54 controls the tool spindle rotation motor 63 so that the grinding wheel 12 rotates about the predetermined axis 160. Next, the tool spindle control unit 54 controls the tool spindle feed motor 62 so that the grinding wheel 12 moves in the Z-axis direction. While the grinding wheel 12 rotates about the predetermined axis 160 and the first dresser 36A contacts the first grinding surface 21A, the tip of the first dresser 36A moves from the first position Pa to the second position Pb of the first grinding surface 21A, whereby the first grinding surface 21A is dressed. (Hereinafter, the position where the dresser 36 contacts the grinding surface 21 is also referred to as the "dressing position".) At this time, the tool spindle control unit 54 controls the tool spindle feed motor 62 such that the dressing speed (the feed speed of the tool spindle 31 in the Z-axis direction) when the first dresser 36A contacts the small-diameter portion 220 of the first grinding wheel surface 21A is greater than the dressing speed (the feed speed of the tool spindle 31 in the Z-axis direction) when the first dresser 36A contacts the large-diameter portion 210 of the first grinding wheel surface 21A.

[0052] As shown in FIG. 4, in the present embodiment, the dressing speed when the dressing position is the first position Pa at the large-diameter portion 210 is Va, and the dressing speed when the dressing position is the second position Pb at the small-diameter portion 220 is Vb, which is greater than Va. The dressing speed increases as the dressing position moves from the first position Pa to the second position Pb.

[0053] Subsequently, the operational effects of providing the above-described magnitude relationship in the dressing speed between the large-diameter portion 210 and the small-diameter portion 220 will be described. FIG. 5 is a cross-sectional view schematically showing the abrasive grains of the grinding wheel (large-diameter portion) after dressing. FIG. 6 is a cross-sectional view schematically showing the abrasive grains of the grinding wheel (small-diameter portion) after dressing.

[0054] Since the diameter of the small-diameter portion 220 centered on the predetermined axis 160 is smaller than the diameter of the large-diameter portion 210 centered on the predetermined axis 160, during the grinding process of the workpiece using the grinding wheel 12, the peripheral speed of the small-diameter portion 220 is lower than the peripheral speed of the large-diameter portion 210. As a result, the cutting edge of the small-diameter portion 220 becomes worse than that of the large-diameter portion 210.

[0055] In contrast, in the present embodiment, the dressing speed when the first dresser 36A contacts the small-diameter portion 220 is set relatively high. As shown in FIG. 5, when the dressing speed is high, the interval H and height T of the cutting edge shape formed on the abrasive grains 91 of the grinding wheel 12 by the dresser 36 become relatively large. Thus, the cutting edge of the grinding wheel 12 improves, while the machining accuracy during grinding deteriorates.

[0056] In addition, the dressing speed when the first dresser 36A contacts the large-diameter portion 210 is set to be relatively low. As shown in FIG. 6, when the dressing speed is low, the interval h and height t of the cutting edge shapes formed on the abrasive grains 91 of the grinding wheel 12 by the dresser 36 become relatively small (h < H, t < T). As a result, the sharpness of the grinding wheel 12 deteriorates, while the machining accuracy during grinding improves.

[0057] Therefore, by making the dressing speed when the first dresser 36A contacts the small-diameter portion 220 greater than the dressing speed when the first dresser 36A contacts the large-diameter portion 210, it becomes possible to dress the first grinding wheel surface 21A so that the sharpness of the grinding wheel 12 at the small-diameter portion 220 increases more than the sharpness of the grinding wheel 12 at the large-diameter portion 210. By performing the grinding process of the workpiece using such a grinding wheel 12, it is possible to suppress the variation in sharpness caused by the difference in the peripheral speed of the grinding wheel surface 21, and a uniform sharpness can be obtained over the entire first grinding wheel surface 21A.

[0058] Further, in the present embodiment, during the above-described dressing process, the position (dressing position) of the first grinding wheel surface 21A that contacts the grinding wheel 12 is shifted from the large-diameter portion 210 to the small-diameter portion 220. According to such a configuration, since it becomes possible to bring the large-diameter portion 210 into contact with the dresser 36 immediately after the start of the dressing process, it is possible to preferentially obtain the desired dressing effect at the large-diameter portion 210 where the frequency of contact with the workpiece is high in the grinding process.

[0059] FIG. 7 is a graph showing a modification of the change in the dressing speed in the dressing process in FIG. 3. Referring to FIG. 5, in this modification, the dressing speed is increased stepwise while the dressing position moves from the first position Pa to the second position Pb. The dressing speed may be increased in a plurality of steps other than two steps.

[0060] Note that by rotating the tool spindle 31 counterclockwise about the rotation center axis 130 from the reference posture and moving the tool spindle 31 in the X-axis direction, dressing of the second grindstone surface 21B by the second dresser 36B becomes possible. Also in this case, the feed rate of the tool spindle 31 may be controlled so that the dressing speed when the second dresser 36B contacts the small-diameter portion of the second grindstone surface 21B becomes larger than the dressing speed when the second dresser 36B contacts the large-diameter portion of the second grindstone surface 21B.

[0061] In the present embodiment, the case where the dressing device 100 is composed of the composite machining machine 101 has been described, but the present invention is not limited to this. The dressing device in the present invention may be composed of, for example, a dressing dedicated device, or may be composed of a grinding device having a dressing function.

[0062] It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0063] 12 Grinding wheel, 16 Grinding wheel portion, 17 Shank portion, 21 Grinding wheel surface, 21A First grinding wheel surface, 21B Second grinding wheel surface, 30 Grinding wheel holding portion, 31 Tool spindle, 31a Spindle end face, 36 Dresser, 36A First dresser, 36B Second dresser, 37 Dresser mounting base, 40 Dresser holding portion, 41 Work spindle, 42 Chuck, 43 Chuck main body portion, 43a End face, 44 Claw portion, 51 Control device, 52 Program storage portion, 53 Program execution portion, 54 Tool spindle control portion, 55 Work spindle control portion, 61 Tool spindle rotation motor, 62 Tool spindle feed motor, 63 Tool spindle rotation motor, 64 Work spindle rotation motor, 70 Moving mechanism portion, 91 Abrasive grain, 100 Dressing device, 101 Composite machining machine, 105 Machining area, 110, 120 Rotation center axis, 130 Swivel center axis, 160 Predetermined axis, 210 Large-diameter portion, 220 Small-diameter portion.

Claims

1. A grinding wheel holding part that holds a grinding wheel extending around a predetermined axis and having a grinding wheel surface with a changing diameter centered on the predetermined axis, and is capable of rotating the grinding wheel around the predetermined axis; A dresser holding part that can hold a dresser for dressing the grinding wheel; A moving mechanism part that moves at least one of the grinding wheel holding part and the dresser holding part so that the dresser and the grinding wheel are relatively scanned; A control device that controls the moving mechanism part so that when the dresser contacts the large-diameter part of the grinding wheel surface, the dresser and the grinding wheel are relatively scanned at a first speed, and when the dresser contacts the small-diameter part of the grinding wheel surface, the dresser and the grinding wheel are relatively scanned at a second speed greater than the first speed. A dressing device for a grinding wheel.

2. The dressing device for a grinding wheel according to claim 1, wherein the control device controls the moving mechanism part so that the position of the grinding wheel surface in contact with the grinding wheel shifts from the large-diameter part of the grinding wheel surface to the small-diameter part of the grinding wheel surface.

3. A method for dressing a grinding wheel that extends around a predetermined axis and has a grinding wheel surface with a changing diameter centered on the predetermined axis, using a dresser, comprising: Rotating the grinding wheel around the predetermined axis, and relatively scanning the dresser and the grinding wheel at a first speed while bringing the dresser into contact with the large-diameter part of the grinding wheel surface; Rotating the grinding wheel around the predetermined axis, and relatively scanning the dresser and the grinding wheel at a second speed greater than the first speed while bringing the dresser into contact with the small-diameter part of the grinding wheel surface. A method for dressing a grinding wheel.

4. A control program for a dressing device that dresses a grinding wheel that extends around a predetermined axis and has a grinding wheel surface with a changing diameter centered on the predetermined axis, using a dresser, wherein: The control program causes the dressing device to: Rotate the grinding wheel around the predetermined axis, and relatively scan the dresser and the grinding wheel at a first speed while bringing the dresser into contact with the large-diameter part of the grinding wheel surface; Rotate the grinding wheel around the predetermined axis, and relatively scan the dresser and the grinding wheel at a second speed greater than the first speed while bringing the dresser into contact with the small-diameter part of the grinding wheel surface. A control program.

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