JP2021088044A - Grindstone, grindstone unit and machine tool - Google Patents

Abstract

To provide a grindstone that can increase grinding amounts while suppressing deterioration of grinding capability, a grindstone unit, and a machine tool.SOLUTION: A grindstone 10 for grinding a work-piece W comprises a plurality of pillar parts 42 arranged at intervals along a circumferential direction C of the grindstone 10 on a side peripheral surface 41 of the grindstone 10 and extended in a direction in which the parts cross the side peripheral surface 41 of the grindstone 10. The pillar parts 42 comprise a plurality of abrasive grains that contact the work-piece W when grinding the work-piece W and binding materials that bind the plurality of abrasive grains. This can increase grinding amounts while suppressing deterioration of grinding capability of the grindstone 10.SELECTED DRAWING: Figure 1

Description

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

For example, the milling machine described in Patent Document 1 rotates a cutting tool to cut a workpiece.
For example, the grinding machine described in Patent Document 2 grinds a work piece with a grindstone provided with a plurality of abrasive grains and a binder that binds the plurality of abrasive grains.

Japanese Unexamined Patent Publication No. 4-129610 Japanese Unexamined Patent Publication No. 2016-165786

In the milling machine described in Patent Document 1, when the cutting edge of the cutting tool is rounded due to the cutting process by the cutting tool, the sharpness of the cutting tool is lowered and the processing ability of the cutting tool is lowered.
Further, the grinding machine described in Patent Document 2 is less likely to reduce sharpness than a milling machine, and although the processing ability is maintained, the amount of processing that can be scraped from the workpiece is small, and the grinding machine is suitable for processing with a large amount of processing. Absent.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grindstone, a grindstone unit, and a machine tool capable of increasing the amount of machining while suppressing a decrease in machining ability.

In order to achieve the above object, the grindstone according to the first aspect of the present invention is a grindstone for processing an workpiece, and is arranged on the side peripheral surface of the grindstone at intervals along the circumferential direction of the grindstone. A plurality of pillars extending in a direction intersecting the side peripheral surfaces of the grindstone are provided, and the pillars include a plurality of abrasive grains that come into contact with the workpiece when the workpiece is processed, and the plurality of pillars. It is provided with a binder for binding the abrasive grains of the above.

Further, the pillar portion may be provided with two wall portions that are integrated so as to intersect each other at different angles.

Further, the pillar portion may be formed in a tubular shape extending in a direction intersecting the side peripheral surface of the grindstone.

Further, the pillar portion may be formed in a Y shape when viewed from the radial direction of the grindstone.

Further, the plurality of first pillar portions, which are the plurality of pillar portions, are provided on the side peripheral surface of the grindstone and extend in a direction intersecting the side peripheral surface, and the grindstone is provided on the side peripheral surface of the grindstone. A plurality of second pillar portions provided on the intersecting end faces and extending in the direction of intersecting the end faces may be provided.

Further, the grindstone is provided on the side peripheral surface of the grindstone, is formed of a porous material having a lower elastic modulus than the pillar portion and allowing a fluid to pass through, and holds a holding material for holding the plurality of pillar portions. You may be prepared.

Further, the holding material may include a plurality of sharpening grains, and the sharpening grains may be made to sharpen the abrasive grains by scraping the binder after falling off from the holding material.

Further, each of the tubular pillars has a rectangular wave portion, and has a rectangular corrugated plate shape extending in a direction along the rotation axis of the grindstone so that the rectangular corrugated portions face each other in the circumferential direction of the grindstone. It may be formed by two corrugated plate portions overlapped with each other.

In order to achieve the above object, the grindstone unit according to the second aspect of the present invention is the grindstone, which is fixed to the grindstone formed in a bottomed tubular shape and the internal space of the grindstone to hold the grindstone. A grindstone holder is provided, and the grindstone holder is formed with a fluid passage hole through which a fluid passes, and the fluid passage hole has an inflow end portion exposed to the outside so that a fluid can flow in, and at least a part thereof. It is provided with an outflow end portion that is located opposite to the holding material and allows the fluid that has flowed into the fluid passage hole through the inflow end portion to flow out toward the holding material.

In order to achieve the above object, the machine tool according to the third aspect of the present invention includes the grindstone, a grindstone holder for holding the grindstone, and a shaft fixed to the grindstone holder and extending along the rotation axis of the grindstone. And a drive unit that rotates the shaft around the shaft.

According to the present invention, in a grindstone, a grindstone unit and a machine tool, it is possible to increase the machining amount while suppressing a decrease in machining ability.

It is the schematic of the machine tool which concerns on one Embodiment of this invention. It is a perspective view of the grindstone which concerns on one Embodiment of this invention. It is an enlarged view which shows the range A of FIG. It is a front view of the range B of FIG. 2 of the grindstone which concerns on one Embodiment of this invention. It is sectional drawing of the DD line of FIG. It is the schematic which shows the operation of the pillar part when the workpiece is processed by the grindstone which concerns on one Embodiment of this invention. It is a developed view of a part of the side peripheral surface of the grindstone which concerns on the modification of this invention. It is a developed view of a part of the side peripheral surface of the grindstone which concerns on the modification of this invention. It is a developed view of a part of the side peripheral surface of the grindstone which concerns on the modification of this invention. It is the figure which looked at the pillar part of the grindstone which concerns on the modification of this invention from the radial direction of a grindstone.

An embodiment of a grindstone, a grindstone unit, 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, a drive unit 27, and a coolant liquid supply unit 28. The grindstone unit 1 includes a grindstone 10 for processing the workpiece W and a grindstone holder 20 for holding the grindstone 10.

The grindstone holder 20 is made of metal and has a substantially disk shape. A columnar shaft 25 is inserted through the center of the grindstone holder 20. The grindstone holder 20 is integrated with the shaft 25 and rotates about a rotation shaft O along the shaft 25.

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

As shown in FIGS. 1 and 2, the grindstone 10 has a bottomed tubular shape in which the grindstone holder 20 is located inside. Specifically, the grindstone 10 includes an end face processing portion 30 having a holding material 37 and a plurality of pillar portions 32, and a side surface processing portion 40 having a holding material 47 and a plurality of pillar portions 42.

The end face processing portion 30 is formed in a ring plate shape along the XY plane. The end face processing portion 30 has an end face 31 along an XY plane in which the workpiece W is in contact during processing.
Specifically, the end face processing portion 30 includes a plurality of pillar portions 32 extending along the Z direction orthogonal to the end face 31. Each pillar portion 32 is formed in a tubular shape, for example, a regular hexagonal tubular shape. Each pillar 32 is provided for processing, for example, polishing or grinding the workpiece W. The plurality of pillar portions 32 are arranged on the end surface 31 of the grindstone 10. The plurality of pillar portions 32 are formed to have the same size as each other and are arranged along the circumferential direction C. The plurality of pillar portions 32 are arranged at equal angles, for example, at intervals of 45 ° along the circumferential direction C. Each pillar portion 32 is composed of six wall portions 33. Two adjacent wall portions 33 are integrated so as to intersect at a predetermined angle, for example, an angle of 60 °.

As shown in FIG. 2, the side surface processed portion 40 has a tubular shape extending in the Z direction, and has a side peripheral surface 41 in contact with the workpiece W during processing. The side peripheral surface 41 extends from the peripheral edge portion of the end surface 31 so as to be orthogonal to the end surface 31.

Specifically, the side surface processed portion 40 includes a plurality of pillar portions 42 extending along the radial direction R orthogonal to the side peripheral surface 41, and a connecting portion 44 connecting the plurality of pillar portions 42. Each pillar portion 42 is formed in a tubular shape, for example, a regular hexagonal tubular shape. Each pillar portion 42 is provided for machining, for example, cutting the workpiece W. The plurality of pillar portions 42 are arranged on the side peripheral surface 41 of the grindstone 10. The plurality of pillars 42 are arranged along the Z direction, and the plurality of pillars 42 in a row 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 angles along the circumferential direction C, for example, at intervals of 22.5 °. The arrangement interval of the plurality of column portions 42 of the side surface processing portion 40 in the circumferential direction C is set to be smaller than the arrangement interval of the plurality of pillar portions 32 of the end face processing portion 30 in the circumferential direction C. For example, the arrangement interval of the pillar portion 42 in the circumferential direction C is set to half of the arrangement interval of the pillar portion 32 in the circumferential direction C.

As shown in FIG. 2, the plurality of connecting portions 44 connect two pillar portions 42 adjacent to each other in the Z direction. The connecting portion 44 connects the vertices P1 and P2 of the two pillar portions 42 adjacent to each other in the Z direction. The two vertices P1 and P2 are located so as to face each other in the Z direction. Each pillar 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. 4, the side surface processing portion 40 connects a plurality of pillar portions 42, for example, three pillar portions 42a, 42b, 42c and a plurality of pillar portions 42a, 42b, 42c which are arranged along the Z direction. A plurality of connecting portions 44, for example, two connecting portions 44a and 44b, are provided. The connecting portion 44a is located between the two pillar portions 42a and 42b, and connects the two pillar portions 42a and 42b. The connecting portion 44b is located between the two pillar portions 42b and 42c, and connects the two pillar portions 42b and 42c.
The pillar portions 42a, 42b, 42c and the connecting portions 44a, 44b are composed of the first and second corrugated plate portions 45, 46. The first and second corrugated sheet portions 45 and 46 form a trapezoidal rectangular corrugated shape along the Z direction, which is bent along the Z direction, respectively. The first corrugated plate portion 45 has a plurality of rectangular corrugated portions 45a, and the second corrugated plate portion 46 has a plurality of rectangular corrugated portions 46a. The rectangular wave portions 45a and 46a have a trapezoidal shape with the base omitted. The first and second corrugated plate portions 45 and 46 are superposed so that the rectangular corrugated portions 45a and 46a face each other in the circumferential direction C. By providing the rectangular wave portions 45a and 46a so as to face each other, the pillar portions 42a, 42b and 42c are formed. The first and second corrugated sheet portions 45 and 46 are adhered to each other at the connecting portion 44 with an adhesive (not shown).

As shown in FIG. 2, the holding material 37 is formed over the entire area of the end face processed portion 30 and holds a plurality of pillar portions 32. The holding material 37 is filled in the internal space of each pillar portion 32, and is also filled between a plurality of pillar portions 32 which are external spaces of each pillar portion 32. The strength of the column portion 32 is increased by the holding material 37. The holding material 47 is formed over the entire area of the side surface processed portion 40 and holds a plurality of pillar portions 42. The holding material 47 is filled in the internal space of each pillar portion 42, and is filled between a plurality of pillar portions 42, which is an external space of each pillar portion 42.

As shown in FIG. 1, the holding members 37 and 47 are set at substantially the same height as the pillar portions 32 and 42. The holding materials 37 and 47 are formed of a material having a lower elastic modulus than the column portions 32 and 42. That is, the holding materials 37 and 47 are formed of a material that is more easily deformed by an external force than the pillar portions 32 and 42 and has a large amount of wear due to friction with the workpiece W. When the workpiece W is processed with the grindstone 10, the holding materials 37 and 47 are more easily scraped and elastically deformed than the column portions 32 and 42. Therefore, as shown in FIG. 3, even when the side peripheral surface 41 of the grindstone 10 is worn by the processing of the workpiece W, the holding material 47 keeps the workpiece W by a distance F from the pillar portion 42. Is maintained in a retracted state.
The holding material 37 is the same as the holding material 47. Therefore, the holding materials 37 and 47 are suppressed from protruding toward the workpiece W from the pillars 32 and 42, and do not hinder the processing of the workpiece W by the pillars 32 and 42.
The holding materials 37 and 47 are formed of a porous material that allows a fluid that is a gas or a liquid to pass through, that is, a porous material. The holding materials 37 and 47 are made of, for example, a porous resin or ceramic.

As shown in FIG. 3, the pillar portion 42 includes a plurality of abrasive grains 15 and a binder 16 for binding the plurality of abrasive grains 15. The plurality of abrasive grains 15 are distributed in the binder 16. The abrasive grain 15 is, for example, diamond. The abrasive grains 15 are not limited to diamond, but may be cubic boron nitride (CBN) abrasive grains, or CBN abrasive grains and diamond may be mixed. Further, the plurality of abrasive grains 15 may be silicon carbide (SiC), molten alumina (Al ₂ O ₃ ), or a mixture thereof.

The binder 16 holds a plurality of abrasive grains 15 inside. The binder 16 is formed of a metal such as nickel or aluminum, a resin or a ceramic. Similar to the column portion 42, the column portion 32 includes a plurality of abrasive grains and a binder.
As shown in FIG. 3, the holding material 47 includes a plurality of sharpening grains 47a. The sharpening grains 47a are formed of a material that is harder than the binder 16 and softer than the abrasive grains 15. The dressing grain 47a is, for example, a grain made of silicon carbide (SiC) or silicon dioxide (SiO ₂ ). After the sharpening grains 47a fall off from the holding material 47, the binder 16 of the pillar portion 42 is scraped. As a result, the abrasive grains 15 of the pillar portion 42 are sharpened. Like the holding material 47, the holding material 37 also contains a plurality of sharpening grains.

As shown in FIG. 1, the coolant liquid supply unit 28 supplies the coolant liquid Clt to the grindstone 10.
Fluid passage holes 21, 22, 23, 24 are formed in the grindstone holder 20. When one set of fluid passage holes 21, 22, 23, 24 is used, a plurality of sets of fluid passage holes 21, 22, 23, 24 are arranged at intervals along the circumferential direction C.
The fluid passage hole 21 extends in the Z direction along the rotation axis O of the shaft 25. The inflow end 21i, which is the upper end of the fluid passage hole 21, is located on the upper surface of the grindstone holder 20.
The fluid passage holes 22, 23, and 24 are arranged in the Z direction along the rotation axis O of the shaft 25, and extend along the radial direction R of the grindstone 10, respectively. One end of the fluid passage holes 22, 23, 24 inside the radial direction R is connected to the fluid passage hole 21, and the other end of the fluid passage holes 22, 23, 24 outside the radial direction R, the outflow end portions 22o, 23o, 24o. Is located on the side peripheral surface of the grindstone holder 20. The outflow end portions 22o, 23o, 24o face the holding material 47 formed of the porous material. The coolant liquid Clt enters the fluid passage holes 21, 22, 23, 24 through the inflow end 21i, and the centrifugal force acting during the rotation of the grindstone 10 causes the outflow ends of the fluid passage holes 22, 23, 24. It is discharged to the outside of the grindstone 10 in the radial direction R via the holding material 47 toward 22o, 23o, and 24o.

Next, the operation of the machine tool 5 will be described.
As shown in FIG. 1, the machine tool 5 contacts the side peripheral surface 41 of the grindstone 10 with the workpiece W while rotating the grindstone unit 1 around the rotation shaft O together with the shaft 25 via the drive unit 27. Let me. As a result, the workpiece W is processed. As shown in FIG. 5, in the grindstone 10, the pillar portion 42 having the abrasive grains 15 and the holding material 47 having no abrasive grains 15 are alternately arranged along the circumferential direction C. Therefore, when the grindstone 10 rotates in the circumferential direction C, the pillar portion 42 that processes the workpiece W and the holding material 47 that does not process the workpiece W alternately come into contact with the workpiece W. As a result, as shown in FIG. 6, the pillar portion 42 rotates toward the workpiece W along the circumferential direction C, and the tip of the pillar portion 42 is applied to the workpiece W with a machining amount K. At the same time, the tip of the pillar portion 42 rubs against the workpiece W. As a result, the workpiece W is processed.
In the conventional grindstone, the 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 processing to cut 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 the present embodiment functions in the same manner as the cutting edge of the milling tool, and is easily cut into the workpiece W. As a result, the grindstone 10 of the present embodiment can increase the processing amount K as compared with the conventional grindstone. Further, during processing, the abrasive grains 15 fall off from the column portion 42 before the tip of the column portion 42 of the grindstone 10 is worn, and new abrasive grains 15 are exposed at the tip of the column portion 42. Therefore, it is suppressed that the machining capacity of the grindstone 10 is lower than that of the milling tool.

As shown in FIG. 1, the machine tool 5 brings the end face 31 of the grindstone 10 into contact with the workpiece W while rotating the grindstone unit 1 around the rotation shaft O together with the shaft 25 via the drive unit 27. As a result, the workpiece W is polished or ground.

As shown in FIG. 1, the machine tool 5 discharges the coolant liquid Clt to the upper surface of the grindstone 10 via the coolant liquid supply unit 28 during the processing of the workpiece W by the grindstone 10. Then, the coolant liquid Clt enters the fluid passage hole 21 via the inflow end portion 21i. Centrifugal force acts on the coolant liquid Clt toward the outer side in the radial direction as the grindstone 10 rotates in the fluid passage hole 21. In response to this centrifugal force, the coolant liquid Clt enters the fluid passage holes 22, 23, 24 from the fluid passage hole 21. The coolant liquid Clt is discharged from the outflow ends 22o, 23o, 24o of the fluid passage holes 22, 23, 24 into the gap between the grindstone holder 20 and the grindstone 10 by centrifugal force. The coolant liquid Clt spreads over the entire gap between the grindstone holder 20 and the grindstone 10, and is discharged to the outside of the grindstone 10 in the radial direction R via the holding material 47. Then, the coolant liquid Clt passes through the holding material 47 made of a porous material through which the liquid can pass, and enters between the grindstone 10 and the workpiece W. Therefore, the frictional heat generated between the grindstone 10 and the workpiece W is cooled by the coolant liquid Clt.

(effect)
According to the above-described embodiment, the following effects are obtained.
(1) The grindstones 10 for processing the workpiece W are arranged on the side peripheral surface 41 of the grindstone 10 at intervals along the circumferential direction C of the grindstone 10 and extend in the direction intersecting the side peripheral surface 41 of the grindstone 10. A plurality of pillar portions 42 are provided. The pillar portion 42 includes a plurality of abrasive grains 15 that come into contact with the workpiece W when the workpiece W is processed, and a binder 16 that binds the plurality of abrasive grains 15.
According to this configuration, in the grindstone 10, the pillar portion 42 having the abrasive grains 15 and the holding material 47 having no abrasive grains 15 are alternately arranged along the circumferential direction C. As a result, as shown in FIG. 6, the pillar portion 42 rotates toward the workpiece W along the circumferential direction C, and the tip of the pillar portion 42 is applied to the workpiece W with the machining amount K. It is cut into. Therefore, the processing amount K of the grindstone 10 can be increased as compared with the conventional grindstone.
Further, when the workpiece W is processed by the grindstone 10, the abrasive grains 15 fall off from the column portion 42 and a new grindstone is used before the abrasive grains 15 are rounded due to friction with the workpiece W and the grinding ability is lowered. The grain 15 is exposed from the column portion 42 so as to be in contact with the workpiece W. Therefore, the grindstone 10 is suppressed from being lowered in machining ability as compared with the conventional milling tool.

(2) The pillar portion 42 includes two wall portions 43 that are integrated so as to intersect each other at different angles.
According to this configuration, since the two wall portions 43 are integrated so as to intersect each other at different angles, the rigidity of the pillar portion 42 can be increased as compared with the case where the two wall portions are integrated in a flat plate shape. .. Thereby, the processing capacity of the grindstone 10 can be improved.

(3) The pillar portion 42 is formed in a tubular shape extending in a direction intersecting the side peripheral surface 41 of the grindstone 10.
According to this configuration, the rigidity of the pillar portion 42 can be increased, and the processing capacity of the grindstone 10 can be improved.

(4) The plurality of pillar portions 42, which is an example of the plurality of first pillar portions, are provided on the side peripheral surface 41 of the grindstone 10 and extend in a direction intersecting the side peripheral surface 41. The grindstone 10 is provided on an end surface 31 orthogonal to the side peripheral surface 41 of the grindstone 10, and includes a plurality of column portions 32 which are examples of a plurality of second column portions extending in a direction intersecting the end surface 31.
According to this configuration, in one grindstone 10, two different types of machining can be performed by utilizing the side peripheral surface 41 and the end surface 31 of the grindstone 10.

(5) The grindstone 10 is provided over the entire side peripheral surface 41 of the grindstone 10, has a lower elastic modulus than the pillar portion 42, is formed of a porous material through which a fluid passes, and holds a plurality of pillar portions 42. A holding material 47 is provided.
According to this configuration, since the holding material 47 is formed of a porous material, the amount of wear during processing is larger than that of a non-porous material. Therefore, it is suppressed that the holding material 47 protrudes toward the work piece W side from the pillar portion 42, and the holding material 47 is suppressed from hindering the processing of the work piece W by the pillar portion 42.
Further, the holding material 47 allows fluid to pass through. Therefore, the fluid that has passed through the holding material 47 can be supplied between the grindstone 10 and the workpiece W. As a result, the frictional heat generated between the grindstone 10 and the workpiece W can be cooled, and chips can be discharged to the outside.
Further, the holding material 47 has a smaller elastic modulus than the column portion 42, and is more easily deformed than the column portion 42 when pressed by the workpiece W. Therefore, it is suppressed that the holding material 47 protrudes toward the work piece W side from the pillar portion 42, and the holding material 47 is suppressed from hindering the processing of the work piece W by the pillar portion 42.

(6) The holding material 47 contains a plurality of sharpening grains 47a. The sharpening grains 47a sharpen the abrasive grains 15 by scraping the binder 16 after falling off from the holding material 47.
According to this configuration, the sharpening of the abrasive grains 15 suppresses a decrease in the processing capacity of the grindstone 10.

(7) The tubular pillar portion 42a has rectangular wave portions 45a and 46a, respectively, and has a rectangular corrugated plate shape extending in the Z direction so that the rectangular wave portions 45a and 46a face each other in the circumferential direction C of the grindstone 10. It is formed by two corrugated plate portions 45, 46 superposed on the above.
According to this configuration, the tubular portion 42a can be formed by superimposing the two corrugated plate portions 45 and 46.

(8) The grindstone unit 1 includes a grindstone 10 formed in a bottomed tubular shape, and a grindstone holder 20 fixed in the internal space of the grindstone 10 and holding the grindstone 10. The grindstone holder 20 is formed with fluid passage holes 21, 22, 23, 24 through which the coolant liquid Clt, which is an example of the fluid, passes. The fluid passage holes 21, 22, 23, 24 are located at the inflow end 21i where the coolant Clt is exposed to the outside so that the coolant can flow in, and at least a part thereof faces the holding material 47, and are located via the inflow end 21i. The outflow end portions 22o, 23o, 24o are provided so that the coolant liquid Clt that has flowed into the fluid passage holes 21, 22, 23, 24 flows out toward the holding material 47.
According to this configuration, the coolant liquid Clt is discharged toward the holding material 47 through the fluid passage holes 21, 22, 23, 24. Then, the coolant liquid Clt passes through the holding material 47 and is supplied between the grindstone 10 and the workpiece W. As a result, the frictional heat generated between the grindstone 10 and the workpiece W can be cooled and chips can be discharged.

(9) The machine tool 5 has 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. A unit 27 is provided.
According to this configuration, in the machine tool 5, the processing amount K of the grindstone 10 can be increased as compared with the conventional grindstone, and the decrease in the processing capacity of the grindstone 10 is suppressed.

(Modification example)
In addition, the said embodiment can be carried out in the following embodiments which modified this as appropriate.
In the above embodiment, the fluid passage holes 21, 22, 23, 24 of the grindstone holder 20 may be omitted. Further, the coolant liquid supply unit 28 may be omitted.

In the above embodiment, the pillars 32 and 42 are formed in the shape of a regular hexagonal cylinder, but the pillars 32 and 42 do not have to be in the shape of a regular hexagonal cylinder as long as they are in the shape of a hexagonal cylinder. Further, the pillar portions 32 and 42 do not have to have a hexagonal tubular shape as long as they have a polygonal tubular shape, and may be, for example, a polygonal tubular shape having a pentagon or less or a seven-sided or more. Further, the pillars 32 and 42 do not have to be polygonal tubular as long as they are tubular, and may be cylindrical. Hereinafter, a modified example of the pillar portion will be described with reference to FIGS. 7 to 9.

For example, as shown in FIG. 7, the plurality of pillar portions 142 may have a V-shape or an L-shape. The plurality of pillar portions 142 are arranged in a row along the circumferential direction C. The plurality of pillars 142 are provided in the same direction. The pillar portion 142 includes two wall portions 143 and 144 that intersect each other at different angles. The angle formed by the two wall portions 143 and 144 may be an acute angle or an obtuse angle. Further, the two wall portions 143 and 144 may be integrally formed or may be formed separately.
Further, in the example of FIG. 7, only one pillar portion 142 is provided in the Z direction, but two or more pillar portions 142 may be provided side by side in the Z direction.
By having the two wall portions 143 and 144 where the pillar portions 142 intersect with each other at different angles, the rigidity of the pillar portions 142 can be increased. Further, since the side surface processed portion 40 in FIG. 7 has a gap penetrating in the Z direction, the fluid can easily pass in the Z direction.

Further, for example, as shown in FIG. 8, L-shaped pillar portions 343, 344, 345 may be combined. The inner surface 344a of the pillar portion 344 is adhered to the inner surface 343a of the pillar portion 343, and the inner surface 345a of the pillar portion 345 is adhered to the inner surface 343b of the pillar portion 343. The pillar portion 343, the pillar portion 344, and the pillar portion 345 face each other in opposite directions. By combining the plurality of L-shaped pillars in this way, one row of pillars inclined with respect to the Z direction is formed, and the plurality of rows of pillars are arranged along the circumferential direction.
As described above, by combining the L-shaped column portions, the portion where the column portions overlap increases, and the rigidity of the column portions can be increased. Further, since the side surface processed portion 40 in FIG. 8 has a gap penetrating in a direction inclined with respect to the Z direction, the fluid can easily pass therethrough.

Further, for example, as shown in FIG. 9, the plurality of pillar portions 242 may have a Y shape when viewed from the radial direction R of the grindstone 10. The plurality of pillar portions 242 are arranged along the circumferential direction C. The plurality of pillar portions 242 are arranged along the first row L1, the second row L2, and the third row L3. The first row L1, the second row L2, and the third row L3 are rows along the circumferential direction C, respectively. The first row L1, the second row L2, and the third row L3 are arranged in the Z direction in the order of the first row L1, the second row L2, and the third row L3 from the upper side in the Z direction.
Each pillar portion 242 includes two substantially V-shaped wall portions 243 and 244, respectively. The wall portions 243 and 244 each include two plate portions 251,252 that intersect at an obtuse angle. The plate portion 251 of the wall portion 243 and the plate portion 251 of the wall portion 244 are overlapped and adhered. As a result, the wall portions 243 and 244 form a substantially Y-shape.
By forming the pillar portion 242 in a Y shape, the rigidity of the pillar portion can be increased. By forming a gap between the plurality of pillar portions 242, chips and coolant liquid Clt can be discharged to the outside through the gap.
Further, not limited to the example of FIG. 9, the pillar portion may be formed in a Y shape by superimposing the three substantially V-shaped wall portions. In this case, the substantially V-shaped wall portion 248 shown by the alternate long and short dash line in FIG. 9 is provided along the inner surfaces of the plate portion 252 of the wall portion 243 and the plate portion 252 of the wall portion 244 facing each other. That is, one of the two outer surfaces of the wall portion 248 is adhered to one of the two outer surfaces of the wall portion 244, and the other of the two outer surfaces of the wall portion 248 is adhered to one of the two outer surfaces of the wall portion 243. Then, the other of the two outer surfaces of the wall portion 244 is adhered to the other of the two outer surfaces of the wall portion 243. As a result, the portion where the pillars overlap increases, and the rigidity of the pillars can be increased. Further, the strength balance of the pillar portion 242 composed of the three wall portions 243, 244 and 248 is enhanced.
Further, as shown in FIG. 10, even if a plurality of abrasive grains 215 for processing the workpiece W are mixed in the adhesive 249 that adheres the three substantially V-shaped wall portions 243, 244, 248. Good. The adhesive 249 is, for example, an epoxy resin. By including the plurality of abrasive grains 215 in the adhesive 249, the processing ability of the grindstone 10 can be improved.
Further, when the three wall portions 243, 244 and 248 are adhered to each other by the adhesive 249 containing the plurality of abrasive grains 215, the abrasive grains 15 included in the wall portions 243, 244 and 248 of the pillar portion 242 (FIG. 3) may be omitted. Further, the adhesive 249 containing the abrasive grains 215 is not limited to the modified example of FIG. 10, and may be used for adhering the wall portion or the column portion in each of the above-described embodiments or the above-mentioned modified examples.
Further, the pillar portion 242 is not limited to the Y-shape, but may be formed in a V-shape, an L-shape, an X-shape, an N-shape, a U-shape, a Z-shape, a C-shape, an I-shape, or the like. Good.
Similar to the pillar portion of the side surface processed portion 40, the shape of the pillar portion 32 of the end surface processed portion 30 can be changed as appropriate.

In the above embodiment, the grindstone 10 includes an end face processing portion 30 and a side surface processing portion 40, but the end face processing portion 30 may be omitted.

In the above embodiment, the pillar portion 42 extends in a direction orthogonal to the side peripheral surface 41 of the grindstone 10, but if it intersects the side peripheral surface 41 of the grindstone 10, it is in a direction orthogonal to the side peripheral surface 41. Not limited to. The pillar portion 32 does not have to be orthogonal to the side peripheral surface 41 as long as it intersects the end surface 31.

In the above embodiment, the connecting portion 44 connects two pillar portions 42 adjacent to each other in the Z direction, but the present invention is not limited to this, and for example, two pillar portions 42 adjacent to each other in the circumferential direction C are connected. May be good.

1 ... Grindstone unit, 5 ... Machine tool, 10 ... Grindstone, 15 ... Abrasive grains, 16 ... Bonding material, 20 ... Grindstone holder, 21, 22, 23, 24 ... Fluid passage holes, 21i ... Inflow end, 22o, 23o , 24o ... Outflow end, 25 ... Shaft, 27 ... Drive, 28 ... Coolant fluid supply, 30 ... End face processing, 31 ... End face, 32, 42, 42a, 42b, 42c, 142, 242, 343, 344 , 345 ... Pillar part, 33,43,143,144,243,244,248 ... Wall part, 37,47,147 ... Holding material, 40 ... Side processing part, 41 ... Side peripheral surface, 44,44a, 44b ... Connecting portion, 45 ... 1st corrugated plate portion, 45a, 46a ... Rectangular corrugated portion, 46 ... Second corrugated plate portion, 251,252 ... Plate portion 343a, 343b, 344a, 345a ... Inner surface, C ... Circumferential direction , F ... distance, K ... machining amount, O ... rotation axis, P1, P2 ... vertex, R ... radial direction, W ... work piece, Clt ... coolant liquid

Claims (10)

A grindstone that processes a work piece
A plurality of pillars arranged on the side peripheral surface of the grindstone at intervals along the circumferential direction of the grindstone and extending in a direction intersecting the lateral peripheral surface of the grindstone are provided.
The pillar is
A plurality of abrasive grains that come into contact with the work piece when processing the work piece,
A binder that binds the plurality of abrasive grains.
Whetstone. The pillars include two walls that are integrated so that they intersect at different angles.
The grindstone according to claim 1. The pillar portion is formed in a tubular shape extending in a direction intersecting the side peripheral surface of the grindstone.
The grindstone according to claim 1 or 2. The pillar portion is formed in a Y shape when viewed from the radial direction of the grindstone.
The grindstone according to claim 1 or 2. The plurality of first pillar portions, which are the plurality of pillar portions, are provided on the side peripheral surface of the grindstone and extend in a direction intersecting the side peripheral surface.
The grindstone is provided on an end face that intersects the side peripheral surface of the grindstone, and includes a plurality of second pillar portions extending in a direction that intersects the end face.
The grindstone according to any one of claims 1 to 4. A holding material provided on the peripheral surface of the grindstone, which has a lower elastic modulus than the pillar portion and is formed of a porous material through which a fluid passes, and holds the plurality of pillar portions.
The grindstone according to any one of claims 1 to 5. The holding material contains a plurality of sharpening grains and contains a plurality of sharpening grains.
After the sharpening grains have fallen off from the holding material, the abrasive grains are sharpened by scraping the binder.
The grindstone according to claim 6. Each of the tubular pillars has a rectangular wave portion, forms a rectangular corrugated plate extending in a direction along the rotation axis of the grindstone, and is superposed so that the rectangular corrugated portions face each other in the circumferential direction of the grindstone. Formed by two corrugated sheet parts,
The grindstone according to claim 3. The grindstone according to claim 6 or 7, wherein the grindstone is formed in a bottomed tubular shape.
A grindstone holder fixed to the internal space of the grindstone and holding the grindstone is provided.
A fluid passage hole through which a fluid passes is formed in the grindstone holder.
The fluid passage hole is
The inflow end where the fluid is exposed to the outside so that the fluid can flow in,
At least a part of the fluid is located facing the holding material, and includes an outflow end portion that allows the fluid that has flowed into the fluid passage hole through the inflow end portion to flow out toward the holding material.
Whetstone unit. The grindstone according to any one of claims 1 to 8.
A grindstone holder that holds the grindstone and
A shaft fixed to the grindstone holder and extending along the rotation axis of the grindstone,
A drive unit that rotates the shaft around the shaft is provided.
Machine Tools.

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