JP7426692B2 - Grinding wheels and machine tools - Google Patents

Description

The present invention relates to a grindstone and a machine tool.

For example, the rotary grindstone described in Patent Document 1 is formed in a disc shape and grinds or polishes a workpiece.

JP2019-34356A

The rotary grindstone described in Patent Document 1 only performs grinding or polishing using the bottom surface of the grinding layer, making it difficult to perform various types of processing.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a grindstone and a machine tool that can perform a variety of processing.

In order to achieve the above object, a grindstone according to a first aspect of the present invention is a grindstone that rotates around a rotation axis and processes a workpiece, and when the grindstone rotates around the rotation axis, a first surface, a second surface, and a third surface for machining the workpiece by contacting the workpiece, the first surface extending in a direction along the rotation axis; a side circumferential surface surrounding a surrounding area, and the second surface is located at a position away from the first surface in the direction in which the rotating shaft extends, and is located inside the side circumferential surface when viewed from the direction in which the rotating shaft extends. and the third surface is an end surface that intersects with the rotation axis, and the third surface connects an outer peripheral end of the second surface far from the rotation axis and an end of the first surface close to the second surface. The grindstone is an inclined surface inclined with respect to a direction along the rotation axis, and the grindstone includes a plurality of first column parts provided on the first surface and extending in a direction intersecting the first surface, and a plurality of first column parts provided on the second surface. a plurality of second pillar portions provided on the third surface and extending in a direction intersecting the second surface; and a plurality of third pillar portions provided on the third surface and extending in a direction intersecting the third surface; Each of the first pillar part, the second pillar part, and the third pillar part is provided only in the first pillar part, the second pillar part, and the third pillar part of the grindstone, and It includes a plurality of abrasive grains that come into contact with the workpiece during processing, and a binding material that binds the plurality of abrasive grains.

Further, each of the first pillar part, the second pillar part, and the third pillar part may be formed in a cylindrical shape.

Further , the grindstone includes two first corrugated plate portions each having a rectangular corrugated plate shape extending along the rotation axis and the first surface, and a rectangular corrugated plate portion extending along the rotation axis and the second surface. and two third corrugated plate portions each having a rectangular corrugated plate shape extending along the rotating shaft and the third surface, and the two first corrugated plate portions include: , each having a first rectangular wave part, and the first columnar part having a cylindrical shape is formed by overlapping each other so that the first rectangular wave parts face each other in the circumferential direction of the grindstone, and the first pillar part is formed in a cylindrical shape. The two-corrugated plate portions each have a second rectangular corrugated portion, and are overlapped such that the second rectangular corrugated portions face each other in the circumferential direction of the grindstone, thereby forming the cylindrical second pillar portion. The two third corrugated plate portions each have a third rectangular corrugated portion, and are overlapped so that the third rectangular corrugated portions face each other in the circumferential direction of the grindstone, thereby forming the cylindrical shape. A third pillar portion may be formed.

Further, lower ends of the two first corrugated plate portions close to the third corrugated plate portion overlap in the circumferential direction with upper ends of the two third corrugated plate portions close to the two first corrugated plate portions . It may also be glued in a state where it is glued .

Further, lower ends of the two third corrugated plate portions close to the second corrugated plate portion overlap in the circumferential direction with outer end portions of the two second corrugated plate portions in the radial direction of the grinding wheel. It may be glued in place .

To achieve the above object, a machine tool according to a second aspect of the present invention includes the grindstone, a grindstone holder that holds the grindstone, and a machine tool that is fixed to the grindstone holder and extends along the rotation axis of the grindstone. The device includes a shaft and a drive unit that rotates the shaft.

According to the present invention, various types of processing can be performed using a grindstone and a machine tool.

1 is a schematic cross-sectional view of a machine tool according to an embodiment of the present invention. FIG. 1 is a front view of a grindstone according to an embodiment of the present invention. FIG. 2 is a bottom view of a grindstone according to an embodiment of the present invention. FIG. 2 is an enlarged view showing range A in FIG. 1. FIG. 3 is an enlarged view of range B in FIG. 2. FIG. (a) is a side view of a corrugated plate portion of a side surface processing section, an inclined surface processing section, and an end surface processing section according to an embodiment of the present invention; FIG. (c) is a bottom view of the corrugated plate portions of each of the side surface processing section, the inclined surface processing section, and the end surface processing section. It is a schematic diagram showing operation of a column part when a workpiece is processed by a grindstone concerning one embodiment of the present invention.

An embodiment of a grindstone and a machine tool according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the machine tool 5 includes a grindstone unit 1, a shaft 25, and a drive section 27. The grindstone unit 1 includes a grindstone 10 for processing a workpiece W, and a grindstone holder 20 for holding the grindstone 10.

The grindstone holder 20 is made of metal and has a truncated cone shape. A cylindrical shaft 25 is inserted through the center of the grindstone holder 20. The grindstone holder 20 rotates integrally with the shaft 25 around a rotation axis O along the shaft 25.

The drive unit 27 moves the grindstone unit 1 in the X direction, Y direction, and Z direction via the shaft 25, and rotates the grindstone unit 1 around the rotation axis O via the shaft 25. Thereby, the grindstone 10 processes, that is, cuts, polishes, or grinds the workpiece W fixed to a chuck (not shown). The workpiece W is ceramics, silicon wafer, semiconductor substrate, LED (Light Emitting Diode) substrate, heat dissipation substrate, silicon carbide, alumina, sapphire, metal, or the like.

As shown in FIG. 1, the grindstone 10 has a cylindrical shape of a truncated cone in which a grindstone holder 20 is located. Specifically, the grindstone 10 includes an end face processing section 30 having a holding material 37, a plurality of pillars 32, and an adhesive part 34, a side surface processing section 40 having a holding material 47, a plurality of pillars 42, and a connecting part 44, and a holding material The inclined surface processing part 50 has a material 57, a plurality of pillar parts 52, and a connecting part 54.

As shown in FIGS. 1 and 3, the end face processing portion 30 is formed in an annular plate shape along an XY plane orthogonal to the rotation axis O. As shown in FIGS. The end surface processing section 30 has an end surface 31 along the XY plane with which the workpiece W contacts during processing.
Each column portion 32 extends along the Z direction orthogonal to the end surface 31. Each column portion 32 is formed into a cylindrical shape extending along the rotation axis O, for example, a regular hexagonal cylindrical shape. Each column portion 32 is provided for processing the workpiece W, for example, polishing or grinding it. The plurality of pillars 32 are arranged along the end surface 31 of the grindstone 10 such that the tips of the pillars 32 are located on the end surface 31.
As shown in FIG. 3, the plurality of cylindrical pillar portions 32 are formed to have the same size and are arranged along the circumferential direction C. The plurality of pillar portions 32 are arranged at equal angles along the circumferential direction C, for example, at intervals of 45°. Each column portion 32 is composed of six wall portions 33. The two adjacent wall portions 33 are integrated so as to intersect at a predetermined angle, for example, an angle of 60°. The two adhesive portions 34 have a flat plate shape extending in the direction away from each column portion 32 along the radial direction R from two vertices of each column portion 32 that are opposed to each other in the radial direction R.

As shown in FIGS. 1 and 2, the side surface machining section 40 extends along the rotation axis O, is located so as to surround the rotation axis O, and has a side circumferential surface 41 with which the workpiece W contacts during machining. The side circumferential surface 41 has a cylindrical shape that extends orthogonally to the end surface 31 . The side circumferential surface 41 has a diameter larger than the outer diameter of the end surface 31.
Each column portion 42 extends along the radial direction R perpendicular to the side circumferential surface 41. Each column portion 42 is formed into a cylindrical shape extending along the radial direction R, for example, a regular hexagonal cylindrical shape. Each column portion 42 is provided for processing, for example, grinding or cutting the workpiece W. The plurality of pillars 42 are arranged along the side peripheral surface 41 of the grindstone 10 such that the tips of the pillars 42 are located on the side peripheral surface 41.
As shown in FIG. 2, the plurality of cylindrical pillars 42 are arranged along the Z direction, and one row of the plurality of pillars 42 arranged along the Z direction are arranged in the circumferential direction C of the grindstone 10. The plurality of pillar portions 42 are arranged at equal angular intervals along the circumferential direction C, for example, at 45° intervals.

As shown in FIG. 2, each of the plurality of connecting portions 44 connects two adjacent column portions 42 in the Z direction. The connecting portion 44 has a flat plate shape that connects the vertices P1 and P2 of each of the two pillar portions 42 adjacent in the Z direction. The two vertices P1 and P2 are located opposite to each other in the Z direction. Each column portion 42 is composed of six wall portions 43. Two adjacent wall portions 43 are integrated so as to intersect at a predetermined angle, for example, an angle of 60°.

As shown in FIG. 2, the inclined surface processing section 50 connects the end surface processing section 30 and the side surface processing section 40, and has a cylindrical shape of a truncated cone centered on the rotation axis O. The inclined surface processing portion 50 is inclined so as to approach the outer side in the radial direction R as it goes upward. The sloped surface processing portion 50 has a sloped surface 51 that is a tapered surface that connects the side circumferential surface 41 and the end surface 31. The inclined surface 51 is inclined with respect to the rotation axis O, and is in contact with the workpiece W (see FIG. 1) during processing. The inclined surface 51 is inclined so that its diameter decreases as it approaches the end surface 31 from the side circumferential surface 41.
Specifically, as shown in FIGS. 1 and 2, each column portion 52 extends in a direction perpendicular to the inclined surface 51. As shown in FIGS. Each column portion 52 is formed into a cylindrical shape extending in a direction perpendicular to the inclined surface 51, for example, a regular hexagonal cylindrical shape. Each column portion 52 is provided for processing, for example polishing or grinding, the workpiece W. The plurality of pillars 52 are arranged along the inclined surface 51 of the grindstone 10 such that the tips of the pillars 52 are located on the inclined surface 51.
As shown in FIG. 3, the plurality of pillar portions 52 are formed to have the same size. The plurality of cylindrical pillars 52 are arranged along the Z direction, and the plurality of pillars 52 in one row along the Z direction are arranged in the circumferential direction C of the grindstone 10 . The plurality of pillar portions 52 are arranged along the circumferential direction C at equal angular intervals, for example, at 45° intervals. Each column portion 52 is composed of six wall portions 53. The two adjacent wall portions 53 are integrally formed so as to intersect at a predetermined angle, for example, an angle of 60°. Each of the plurality of connecting portions 54 has a flat plate shape that connects two pillar portions 52 adjacent to each other in the Z direction.

As shown in FIG. 5, the side surface processing section 40 connects a plurality of column sections 42 arranged along the Z direction, for example, three column sections 42a, 42b, 42c, and a plurality of column sections 42a, 42b, 42c. A plurality of connecting portions 44, for example two connecting portions 44a and 44b, are provided. The connecting part 44a is located between the two pillar parts 42a and 42b, and connects the two pillar parts 42a and 42b. The connecting part 44b is located between the two pillar parts 42b and 42c, and connects the two pillar parts 42b and 42c.

The pillar portions 42a, 42b, 42c and the connecting portions 44a, 44b are constituted by two first corrugated plate portions 45, 46. The two first corrugated plate portions 45 and 46 each have a trapezoidal rectangular wave shape along the Z direction, which is bent along the Z direction. The first corrugated plate part 45 has a plurality of first rectangular wave parts 45a, and the first corrugated plate part 46 has a plurality of first rectangular wave parts 46a. The first rectangular wave portions 45a and 46a have a trapezoidal shape with the bottom side omitted. The two first corrugated plate parts 45 and 46 are stacked so that the respective first rectangular wave parts 45a and 46a face each other in the circumferential direction C. Each column part 42a, 42b, 42c is formed by providing the first rectangular wave parts 45a, 46a so as to face each other. The two first corrugated plate parts 45 and 46 are bonded together at the connecting part 44 with an adhesive (not shown). This adhesive is, for example, an epoxy resin. This adhesive may contain a plurality of abrasive grains.

As shown in FIGS. 6A and 6B, the column part 52 and the connecting part 54 of the inclined surface processing part 50 are constituted by two third corrugated plate parts 55 and 56. The two third corrugated plate portions 55 and 56 each have a trapezoidal rectangular wave shape that extends in an inclined direction so as to approach the inside of the grindstone 10 in the radial direction R as it goes downward in the Z direction.
The third corrugated plate part 55 has a plurality of third rectangular wave parts 55a, and the third corrugated plate part 56 has a plurality of third rectangular wave parts 56a. The third rectangular wave portions 55a and 56a have a trapezoidal shape with the bottom side omitted. The two third corrugated plate parts 55 and 56 are stacked so that the respective third rectangular wave parts 55a and 56a face each other in the circumferential direction C. A cylindrical column portion 52 is formed by providing the third rectangular wave portions 55a and 56a so as to face each other. The two third corrugated plate portions 55 and 56 are bonded together at the connecting portion 54 with an adhesive (not shown). This adhesive is, for example, an epoxy resin. This adhesive may contain a plurality of abrasive grains.

As shown in FIGS. 6A and 6C, the column part 32 of the end face processing part 30 is composed of two second corrugated plate parts 35 and 36. The two second corrugated plate portions 35 and 36 have a trapezoidal rectangular wave shape extending in the radial direction R of the grindstone 10. The second corrugated plate part 35 has a second rectangular wave part 35a, and the second corrugated plate part 36 has a second rectangular wave part 36a. The second rectangular wave portions 35a and 36a have a trapezoidal shape with the bottom side omitted. The two second corrugated plate parts 35 and 36 are stacked so that the respective second rectangular wave parts 35a and 36a face each other in the circumferential direction C. A cylindrical column portion 32 is formed by providing the second rectangular wave portions 35a and 36a so as to face each other. The two second corrugated plate portions 35 and 36 are bonded together at the adhesive portion 34 with an adhesive (not shown). This adhesive is, for example, an epoxy resin. This adhesive may contain a plurality of abrasive grains.

As shown in range D in FIG. 6(b), the lower ends of the two first corrugated plate parts 45 and 46 overlap the upper ends of the two third corrugated plate parts 55 and 56 in the circumferential direction C. The upper ends of the two third corrugated sheet portions 55 and 56 are located between the lower end of the first corrugated sheet portion 45 and the lower end of the first corrugated sheet portion 46 . The first corrugated sheet portions 45, 46 and the third corrugated sheet portions 55, 56 are bonded to each other. As a result, as shown in FIG. 6(a), four pieces, the first corrugated plate parts 45 and 46 and the third corrugated plate parts 55 and 56, are formed at the corner between the side surface processed part 40 and the inclined surface processed part 50. An overlapping region G can be formed. Therefore, the strength of the corner between the side surface processed portion 40 and the inclined surface processed portion 50 can be increased.

As shown in range E in FIG. 6(b), the lower ends of the two third corrugated plate parts 55, 56 are located at the outer ends of the two second corrugated plate parts 35, 36 in the radial direction R. overlaps with The lower ends of the two third corrugated plate parts 55 and 56 are sandwiched between the outer end of the second corrugated plate part 35 in the radial direction R and the outer end of the second corrugated plate part 36 in the radial direction R. It is located like this. The second corrugated sheet portions 35, 36 and the third corrugated sheet portions 55, 56 are bonded to each other. As a result, as shown in FIG. 6(a), four pieces, the third corrugated plate parts 55 and 56 and the second corrugated plate parts 35 and 36, are formed at the corner between the inclined surface processed part 50 and the end face processed part 30. An overlapping region H can be formed. Therefore, the strength of the corner between the inclined surface processed portion 50 and the end surface processed portion 30 can be increased.

As shown in FIGS. 1 and 3, the holding member 37 is formed over the entire area of the end face processed portion 30, and holds the plurality of pillar portions 32. The holding material 37 is filled into the internal space of each columnar section 32 and between the plurality of columnar sections 32 which is the external space of each columnar section 32 .
The holding member 57 is formed over the entire area of the sloped surface processing portion 50 and holds the plurality of pillar portions 52. The holding material 57 is filled into the internal space of each columnar section 52 and between the plurality of columnar sections 52 which is the external space of each columnar section 52 .
As shown in FIGS. 1 and 2, the holding member 47 is formed over the entire area of the side surface processing portion 40, and holds the plurality of pillar portions 42. It is filled into the internal space of each columnar section 42 and between the plurality of columnar sections 42 which is the external space of each columnar section 42 .

As shown in FIG. 1, the holding members 37, 47, 57 are set at substantially the same height as the column parts 32, 42, 52. The holding members 37, 47, 57 are made of a material having a lower elastic modulus than the columnar parts 32, 42, 52. That is, the holding members 37, 47, and 57 are formed of a material that is more easily deformed by external force than the pillar portions 32, 42, and 52, and has a greater amount of wear due to friction with the workpiece W. When processing the workpiece W with the grindstone 10, the holding members 37, 47, 57 are more easily ground than the pillars 32, 42, 52, and are more easily elastically deformed. Therefore, as shown in FIG. 4, even if the side circumferential surface 41 of the grinding wheel 10 is worn out due to machining of the workpiece W, the holding member 47 is attached to the workpiece W by a distance F from the pillar portion 42. It is maintained in a evacuated state against. The holding materials 37 and 57 are also similar to the holding material 47. Therefore, the holding members 37, 47, 57 are suppressed from protruding more toward the workpiece W than the pillars 32, 42, 52, and inhibit the processing of the workpiece W by the pillars 32, 42, 52. do not.
The holding members 37, 47, and 57 are formed of, for example, a porous material that allows a gas or liquid fluid to pass therethrough. The holding materials 37, 47, and 57 are made of, for example, porous resin or ceramic.

As shown in FIG. 4 , the column portion 42 includes a plurality of abrasive grains 15 and a binding material 16 that binds the plurality of abrasive grains 15 together. A plurality of abrasive grains 15 are distributed within the bonding material 16. The abrasive grains 15 are, for example, diamond. Note that the abrasive grains 15 are not limited to diamond, but may be cubic boron nitride (CBN) abrasive grains, or may be a mixture of CBN abrasive grains and diamond. Furthermore, the plurality of abrasive grains 15 may be silicon carbide (SiC), fused alumina (Al ₂ O ₃ ), or a mixture thereof.

The binding material 16 holds a plurality of abrasive grains 15 inside. The bonding material 16 is made of metal such as nickel or aluminum, resin, ceramic, or the like. The column portion 32, like the column portions 42 and 52, includes a plurality of abrasive grains and a bonding material.
As shown in FIG. 4, the holding material 47 includes a plurality of dressing grains 47a. The dressing grains 47a are made of a material that is harder than the binding material 16 and softer than the abrasive grains 15. The dressing grains 47a are, for example, grains made of silicon carbide (SiC) or silicon dioxide (SiO ₂ ). After falling off from the holding material 47, the dressing grains 47a scrape the binding material 16 of the columnar portion 42. As a result, the abrasive grains 15 of the pillar portions 42 are sharpened. Like the holding material 47, the holding materials 37 and 57 also include a plurality of dressing grains.

Next, the operation of the machine tool 5 will be explained.
As shown in FIG. 1, the machine tool 5 rotates the grindstone unit 1 together with the shaft 25 about the rotation axis O through the drive unit 27, and brings the side circumferential surface 41 of the grindstone 10 into contact with the workpiece W. let Thereby, the side surface processing section 40 processes the side surface of the workpiece W. In the whetstone 10, column parts 42 having abrasive grains 15 (see FIG. 4) and holding members 47 not having abrasive grains 15 are alternately arranged along the circumferential direction C. Therefore, when the grindstone 10 rotates in the circumferential direction C, the column part 42 that processes the workpiece W and the holding member 47 that does not process the workpiece W alternately contact the workpiece W. As a result, as shown in FIG. 7, the column part 42 rotates toward the workpiece W along the circumferential direction C, and the tip of the column part 42 is applied to the workpiece W by a machining amount K. At the same time, the tip of the column portion 42 rubs against the workpiece W. As a result, the side surface of the workpiece W is processed.
In conventional grindstones, abrasive grains are uniformly distributed along the circumferential direction, and the abrasive grains only polish the workpiece. Therefore, with the conventional grindstone, the amount of cutting into the workpiece W is smaller than that of the present embodiment. On the other hand, the pillar portion 42 of the grindstone 10 of this embodiment functions similarly to the cutting edge of a milling tool, and is easily cut into the workpiece W. Thereby, the grindstone 10 of this embodiment can increase the processing amount K compared to the conventional grindstone. Further, during processing, the abrasive grains 15 fall off from the pillars 42 before the tips of the pillars 42 of the grindstone 10 are worn out, and new abrasive grains 15 are exposed at the tips of the pillars 42. Therefore, the processing ability of the grindstone 10 is prevented from decreasing compared to a milling tool.

As shown in FIG. 1, the machine tool 5 rotates the grindstone unit 1 together with the shaft 25 around the rotation axis O via the drive unit 27, and brings the end surface 31 of the grindstone 10 into contact with the upper surface of the workpiece W. let As a result, the upper surface of the workpiece W is processed.

As shown in FIG. 1, the machine tool 5 rotates the grinding wheel unit 1 together with the shaft 25 around the rotation axis O through the drive unit 27, and rotates the inclined surface 51 of the grinding wheel 10 at the corner of the workpiece W. contact with. As a result, the corners of the workpiece W are processed, that is, chamfered.
Note that the chamfering process using the inclined surface 51 is performed by chamfering using the end surface 31 and the side circumferential surface 41 in order to remove burrs formed at the corners of the workpiece W due to the process using the end surface 31 and the side circumferential surface 41. Preferably, this is done after processing.

(effect)
According to the embodiment described above, the following effects are achieved.
(1) The grindstone 10 rotates around the rotation axis O and processes the workpiece W. When the grindstone 10 rotates around the rotation axis O, it contacts the workpiece W and processes the workpiece W. It has a first surface, a second surface, and a third surface to be processed. The first surface is a side circumferential surface 41 that extends in the direction along the rotation axis O and surrounds the rotation axis O. The second surface is an end surface 31 extending in a direction intersecting the side circumferential surface 41. The third surface is an inclined surface 51 that is inclined with respect to the direction along the rotation axis O and connects the side circumferential surface 41 and the end surface 31.
According to this configuration, various types of processing can be performed using the side circumferential surface 41, end surface 31, and inclined surface 51 of the grindstone 10. For example, the grindstone 10 processes the side surface of the workpiece W by bringing the side circumferential surface 41 of the grindstone 10 into contact with the side surface of the workpiece W while the grindstone 10 is rotated about the rotation axis O. Further, while the grindstone 10 is rotated about the rotation axis O, the end surface 31 of the grindstone 10 is brought into contact with the plane of the workpiece W, so that the grindstone 10 processes the plane of the workpiece W. Further, while the whetstone 10 is rotated about the rotation axis O, the inclined surface 51 of the whetstone 10 is brought into contact with the corner of the workpiece W, so that the whetstone 10 processes the corner of the workpiece W. .

(2) The grindstone 10 is an example of a plurality of first column parts provided on the side circumferential surface 41, arranged at intervals along the circumferential direction C of the grindstone 10, and extending in a direction intersecting the side circumferential surface 41. The pillar part 42 is an example of a plurality of second pillar parts provided on the end surface 31 and extends in a direction intersecting the end surface 31, and the plurality of second pillar parts provided on the inclined surface 51 and extending in a direction intersecting the inclined surface 51. A column portion 52, which is an example of a third column portion, is provided. Each of the column parts 32, 42, and 52 includes a plurality of abrasive grains 15 that come into contact with the workpiece W when processing the workpiece W, and a binding material 16 that binds the plurality of abrasive grains 15 together.
According to this configuration, on the side circumferential surface 41 of the grindstone 10, the pillar portions 42 having the abrasive grains 15 are arranged at intervals along the circumferential direction C. As a result, as shown in FIG. 7, the column part 42 rotates toward the workpiece W along the circumferential direction C, and the tip of the column part 42 is applied to the workpiece W by a machining amount K. is cut into. Therefore, the processing amount K of the grindstone 10 can be increased compared to the conventional grindstone and the end surface 31 of the grindstone 10. Further, when the workpiece W is processed by the grindstone 10, the abrasive grains 15 fall off from the pillars 42 and a new The grains 15 are exposed from the pillar portion 42 so as to be able to contact the workpiece W. For this reason, the grindstone 10 suppresses a decrease in machining ability compared to conventional milling tools. The inclined surface 51 of the grindstone 10 has the same effect as the side peripheral surface 41 of the grindstone 10.

(3) The pillar portions 32, 42, and 52 are each formed in a cylindrical shape.
According to this configuration, the rigidity of the column parts 32, 42, and 52 can be increased, and the processing ability of the grindstone 10 can be improved.

(4) The inclined surface 51 is located between the side circumferential surface 41 and the end surface 31 in the direction along the rotation axis O so as to connect the side circumferential surface 41 and the end surface 31. The grindstone 10 has two first corrugated plate portions 45 and 46 that are rectangularly corrugated and extend along the rotational axis O and the side circumferential surface 41, and a rectangular corrugated plate that extends along the rotational axis O and the end surface 31. It includes two second corrugated plate parts 35 and 36 and two third corrugated plate parts 55 and 56 that extend along the rotation axis O and the inclined surface 51 and have a rectangular corrugated plate shape. The two first corrugated plate portions 45 and 46 have first rectangular wave portions 45a and 46a, respectively, and are superimposed so that the first rectangular wave portions 45a and 46a face each other in the circumferential direction C of the grindstone 10. Thus, a cylindrical column portion 42 is formed. The two second corrugated plate portions 35 and 36 have second rectangular wave portions 35a and 36a, respectively, and are superimposed so that the second rectangular wave portions 35a and 36a face each other in the circumferential direction C of the grindstone 10. Thus, a cylindrical column portion 32 is formed. The two third corrugated plate portions 55 and 56 have third rectangular wave portions 55a and 56a, respectively, and are superimposed so that the third rectangular wave portions 55a and 56a face each other in the circumferential direction C of the grindstone 10. A cylindrical column portion 52 is formed by this.
According to this configuration, the plurality of cylindrical columnar parts 32, 42, 52 with high strength can be easily formed.

(5) The lower ends of the two first corrugated sheet portions 45, 46 near the third corrugated sheet portions 55, 56 are connected to the upper ends of the two third corrugated sheet portions 55, 56 near the first corrugated sheet portions 45, 46. They overlap in the circumferential direction C.
According to this configuration, an overlapping region G is formed in the corner between the side surface processing section 40 and the inclined surface processing section 50, where the first corrugated sheet sections 45, 46 and the third corrugated sheet sections 55, 56 overlap. be able to. Therefore, the strength of the corner between the side surface processed portion 40 and the inclined surface processed portion 50 can be increased. Since stress concentration tends to occur at the corners of the grindstone 10, it is preferable to increase the strength of the corners of the grindstone 10.

(6) The lower ends of the two third corrugated plate parts 55 and 56 close to the second corrugated plate parts 35 and 36 are connected to the outer ends of the two second corrugated plate parts 35 and 36 in the radial direction R of the grinding wheel 10. They overlap in the circumferential direction C.
According to this configuration, an overlapping region H is formed in the corner between the inclined surface processed portion 50 and the end surface processed portion 30, where the four third corrugated plate portions 55, 56 and the second corrugated plate portions 35, 36 overlap. be able to. Therefore, the strength of the corner between the inclined surface processed portion 50 and the end surface processed portion 30 can be increased. Since stress concentration tends to occur at the corners of the grindstone 10, it is preferable to increase the strength of the corners of the grindstone 10.

(7) The machine tool 5 includes a grindstone 10, a grindstone holder 20 that holds the grindstone 10, a shaft 25 that is fixed to the grindstone holder 20 and extends along the rotation axis O of the grindstone 10, and a drive that rotates the shaft 25. 27.
According to this configuration, the machine tool 5 can perform various types of processing using the side circumferential surface 41, end surface 31, and inclined surface 51 of the grindstone 10.

(8) The pillar portions 32, 42, and 52 each include two wall portions 33, 43, and 53 that are integral with each other so as to intersect at different angles.
According to this configuration, since the two wall parts 33, 43, 53 are integrated so as to intersect at different angles, the pillar parts 32, 42, 52 can be increased in rigidity. Thereby, the processing ability of the grindstone 10 can be improved.

(9) The processing method using the machine tool 5 is to rotate the grindstone 10 around the rotation axis O and bring the end surface 31 of the grindstone 10 into contact with the workpiece W (for example, the upper surface of the workpiece W). The process of machining the workpiece W, and the process of rotating the whetstone 10 around the rotation axis O and bringing the side circumferential surface 41 of the whetstone 10 into contact with the workpiece W (for example, the side surface of the workpiece W) The process of machining W and rotating the whetstone 10 around the rotation axis O while bringing the inclined surface 51 of the whetstone 10 into contact with the workpiece W (for example, a corner of the workpiece W) A step of processing the.
According to this configuration, the workpiece W can be processed in many different ways using one grindstone. Therefore, there is no need to prepare a large number of tools including grindstones.

(Modified example)
Note that the above embodiment can be implemented in the following forms with appropriate modifications.
In the embodiment described above, the columnar portions 32, 42, and 52 are formed in a regular hexagonal cylindrical shape, but the columnar portions 32, 42, and 52 do not need to be in a regular hexagonal cylindrical shape as long as they have a hexagonal cylindrical shape. Moreover, the pillar parts 32, 42, 52 do not have to be hexagonal cylinders as long as they are polygonal cylinders, and may be polygonal cylinders having five or less or seven sides or more, for example. Furthermore, the columnar parts 32, 42, 52 do not have to be polygonal cylinders as long as they are cylindrical, and may be cylindrical.
Further, for example, the pillar portions 32, 42, 52 may have a V-shape, an L-shape, an X-shape, an N-shape, a U-shape, a Z-shape, a C-shape, or an I-shape. good. Further, the shapes of the pillar portions 32, 42, and 52 may be different.

In the above embodiment, the pillar portion 42 extends in a direction perpendicular to the side circumferential surface 41 of the grindstone 10, but if the column portion 42 extends in a direction intersecting the side circumferential surface 41 of the grindstone 10, the column portion 42 extends in a direction perpendicular to the side circumferential surface 41. but not limited to. Further, the columnar portion 32 does not need to be orthogonal to the end surface 31 as long as it intersects with the end surface 31, and the column portion 52 does not need to be orthogonal to the inclined surface 51 as long as it intersects with the inclined surface 51. good.

In the embodiment described above, the connecting parts 44 and 54 connect the two pillar parts 42 and 52 adjacent in the Z direction, but the invention is not limited to this. For example, the connecting parts 44 and 54 connect the two pillar parts 42 and 52 adjacent in the circumferential direction C. , 52 may be connected. Further, the adhesive portion 34 may also connect two pillar portions 32 adjacent in the circumferential direction C.

In the embodiment described above, the processing using the end surface 31, the processing using the inclined surface 51, and the processing using the side circumferential surface 41 may be carried out in any order. Further, the machining by the end surface 31, the machining by the inclined surface 51, and the machining by the side circumferential surface 41 may be performed simultaneously on a plurality of workpieces W, or sequentially on the same part of the workpiece W. may be carried out.

In the above embodiment, the diameter of the side circumferential surface 41 is set larger than the diameter of the end surface 31; however, the diameter of the side circumferential surface 41 is not limited to this, and the diameter of the side circumferential surface 41 is set smaller than the diameter of the end surface 31. It's okay. In this case, the inclined surface 51 is inclined so that its diameter increases as it approaches the end surface 31 from the side circumferential surface 41.

DESCRIPTION OF SYMBOLS 1... Grinding wheel unit, 5... Machine tool, 10... Grinding wheel, 15... Abrasive grain, 16... Binding material, 20... Grinding wheel holder, 25... Shaft, 27... Drive part, 30... End face processing part, 31... End face, 32, 42, 42a, 42b, 42c, 52... Pillar part, 33, 43, 53... Wall part, 34... Adhesive part, 44, 44a, 44b, 54... Connecting part, 35, 36... Second corrugated plate part, 35a, 36a... Second rectangular wave part, 37, 47, 57... Holding material, 40... Side surface processing part, 41... Side peripheral surface, 45, 46... First corrugated plate part, 45a, 46a... First rectangular wave part, 47a ...Sharpening grain, 50...Sloped surface processed part, 51...Slanted surface, 55, 56...Third corrugated plate part, 55a, 56a...Third rectangular wave part, C...Circumferential direction, D, E...Range, F...Distance , G, H...overlapping area, K...machining amount, O...rotation axis, P1, P2...apex, R...radial direction, W...workpiece

Claims (6)

A grindstone that rotates around a rotating shaft and processes a workpiece,
A first surface, a second surface, and a third surface that process the workpiece by contacting the workpiece when the grindstone rotates around the rotation axis,
The first surface is a side circumferential surface that extends in a direction along the rotation axis and surrounds the rotation axis,
The second surface is located at a position away from the first surface in the direction in which the rotation shaft extends, is located inside the side circumferential surface when viewed from the direction in which the rotation shaft extends, and has an end that intersects with the rotation shaft. surface,
The third surface is an inclined surface that is inclined with respect to the direction along the rotation axis, connecting an outer peripheral end of the second surface far from the rotation axis and an end of the first surface close to the second surface. can be,
The whetstone is
a plurality of first pillar portions provided on the first surface and extending in a direction intersecting the first surface;
a plurality of second pillar portions provided on the second surface and extending in a direction intersecting the second surface;
a plurality of third pillar portions provided on the third surface and extending in a direction intersecting the third surface;
Each of the first pillar part, the second pillar part, and the third pillar part is
A plurality of abrasive grains that are provided only in the first pillar part, the second pillar part, and the third pillar part of the grindstone and come into contact with the workpiece when processing the workpiece;
a binding material that binds the plurality of abrasive grains;
Whetstone. The first pillar part, the second pillar part, and the third pillar part are each formed in a cylindrical shape,
The grindstone according to claim 1 . The whetstone is
two first corrugated plate portions each having a rectangular corrugated plate shape extending along the rotation axis and the first surface;
two second corrugated plate portions each having a rectangular corrugated plate shape extending along the rotation axis and the second surface;
two third corrugated plate portions each having a rectangular corrugated plate shape extending along the rotation axis and the third surface;
The two first corrugated plate portions each have a first rectangular corrugated portion, and are overlapped such that the first rectangular corrugated portions face each other in the circumferential direction of the grindstone, thereby forming the cylindrical first column. part is formed,
The two second corrugated plate portions each have a second rectangular corrugated portion, and are superimposed so that the second rectangular corrugated portions face each other in the circumferential direction of the grindstone, thereby forming the cylindrical second corrugated plate portion. A column is formed,
The two third corrugated plate portions each have a third rectangular corrugated portion, and are overlapped so that the third rectangular corrugated portions face each other in the circumferential direction of the grindstone, thereby forming the cylindrical third corrugated plate portion. A column is formed.
The grindstone according to claim 2 . Lower ends of the two first corrugated plate portions close to the third corrugated plate portion overlap in the circumferential direction with upper ends of the two third corrugated plate portions close to the two first corrugated plate portions. It is glued with
The grindstone according to claim 3 . The lower ends of the two third corrugated plate portions close to the second corrugated plate portion overlap in the circumferential direction with the outer ends of the two second corrugated plate portions in the radial direction of the grinding wheel. is glued,
The whetstone according to claim 3 or 4 . The whetstone according to any one of claims 1 to 5 ,
a whetstone holder that holds the whetstone;
a shaft fixed to the grindstone holder and extending along the rotation axis of the grindstone;
a drive unit that rotates the shaft;
Machine Tools.