JP7417988B2 - Grinding wheels, grinding wheel units and machine tools - Google Patents

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 blade to cut a workpiece.
For example, the grinding machine described in Patent Document 2 grinds a workpiece using a grinding wheel that includes a plurality of abrasive grains and a binder that binds the plurality of abrasive grains.

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

In the milling machine described in Patent Document 1, when cutting is performed using the blade, when the cutting edge of the blade becomes rounded, the sharpness of the blade decreases, and the processing ability of the blade decreases.
Furthermore, the grinding machine described in Patent Document 2 is less likely to lose sharpness than a milling machine and maintains machining ability, but the amount of machining that can be removed from the workpiece is small, making it unsuitable for machining that involves a large amount of machining. do not have.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a grindstone, a grindstone unit, and a machine tool that can increase the amount of processing while suppressing a decrease in processing ability.

In order to achieve the above object, a grindstone according to a first aspect of the present invention is a grindstone for processing a workpiece, and is provided with grooves formed on a side peripheral surface of the grindstone at intervals along the circumferential direction of the grindstone . a plurality of columnar parts that are arranged in series , extend in a direction intersecting the side peripheral surface of the grindstone, are each formed in a cylindrical shape, and process the workpiece ; a holding material that holds the plurality of column parts by filling the internal spaces and external spaces of the plurality of column parts and does not process the workpiece, and the column part extends over the entire area of the column part. a plurality of abrasive grains that are distributed and come into contact with the workpiece when processing the workpiece, and a binding material that binds the plurality of abrasive grains, the circumferential direction of the plurality of column parts The distance between the column and the column when a part of the column is in contact with the workpiece during machining in which the side peripheral surface is brought into contact with the workpiece while rotating the grindstone around its rotation axis The state is set to alternate between a state in which only the holding member is in contact with the workpiece and the holding member is not in contact with the workpiece.

Further, the grindstone is formed in a cylindrical shape with a bottom, and the grindstone is a column portion different from the plurality of first column portions, which are the plurality of column portions, and is provided on an end surface intersecting the side circumferential surface. The grinding wheel may include a plurality of second pillar portions formed in a cylindrical shape extending in a direction intersecting the end surface and arranged at intervals along the circumferential direction of the grindstone.

Moreover, the arrangement interval in the circumferential direction of the plurality of first pillar parts may be set to half the arrangement interval in the circumferential direction of the plurality of second pillar parts.

Moreover, the plurality of first column parts may be provided at the same position as the second column part every other column in the circumferential direction.

Further, the pillar portion may include a plurality of integral wall portions that intersect with each other at different angles.

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

Further, each of the cylindrical columnar portions has a rectangular corrugated portion and is in the form of a rectangular corrugated plate extending in a direction along the rotation axis of the grinding wheel, such that the rectangular corrugated portions face each other in the circumferential direction of the grinding wheel. It may also be formed by two corrugated plate parts superimposed on each other.

In order to achieve the above object, a grindstone unit according to a second aspect of the present invention includes the grindstone, a grindstone holder that is fixed to an internal space of the grindstone formed in a cylindrical shape with a bottom and holds the grindstone; A grindstone unit comprising: the holding material being formed of a porous material that allows fluid to pass through; the grindstone holder having a plurality of first and second fluid passage holes through which the fluid passes ; The plurality of first fluid passage holes extend along the rotation axis of the grindstone and are arranged at intervals in the circumferential direction of the grindstone, and the plurality of second fluid passage holes each extend along the radial direction of the grindstone. and are arranged at intervals in the circumferential direction of the grindstone, a radially inner end of the grindstone is connected to the first fluid passage hole so that fluid can enter and exit, and the plurality of first fluid passage holes are , each of which has an inflow end that is located on the upper surface of the grindstone holder and is exposed to the outside so that fluid can flow in, and each of the plurality of second fluid passage holes is located at a radially outer end of the grindstone. and an outflow end that causes the fluid that flows in from the inflow end and passes through the first and second fluid passage holes to flow out toward the holding material.

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

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

1 is a schematic diagram of a machine tool according to an embodiment of the present invention. FIG. 1 is a perspective 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. FIG. 3 is a front view of range B in FIG. 2 of a grindstone according to an embodiment of the present invention. 2 is a sectional view taken along line DD in FIG. 1. FIG. 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. It is a partial development view of the side peripheral surface of the grindstone based on the modification of this invention. It is a partial development view of the side peripheral surface of the grindstone based on the modification of this invention. It is a partial development view of the side peripheral surface of the grindstone based on the modification of this invention. It is a figure which looked at the pillar part of the grindstone concerning the modification of the present invention from the radial direction of the 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 section 27, and a coolant supply section 28. 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 substantially disk 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 FIGS. 1 and 2, the grindstone 10 has a cylindrical shape with a bottom in which a grindstone holder 20 is located. Specifically, the grindstone 10 includes an end face processing section 30 having a holding material 37 and a plurality of pillars 32, and a side surface processing section 40 having a holding material 47 and a plurality of pillars 42.

The end face processing portion 30 is formed in an annular plate shape along the XY plane. The end surface processing section 30 has an end surface 31 along the XY plane with which the workpiece W contacts during processing.
Specifically, the end face processing section 30 includes a plurality of pillar parts 32 extending along the Z direction orthogonal to the end face 31. Each column portion 32 is formed in a cylindrical shape, 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 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 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 degrees. 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°.

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

Specifically, the side surface processing portion 40 includes a plurality of columnar portions 42 extending along the radial direction R perpendicular to the side circumferential surface 41, and a connecting portion 44 that connects the plurality of columnar portions 42. Each column portion 42 is formed in a cylindrical shape, for example, a regular hexagonal cylindrical shape. Each column portion 42 is provided for processing, for example cutting, the workpiece W. The plurality of pillar parts 42 are arranged on the side peripheral surface 41 of the grindstone 10. The plurality of pillar parts 42 are arranged along the Z direction, and one row of the plurality of pillar parts 42 arranged along the Z direction is 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 in the circumferential direction C of the plurality of columnar parts 42 of the side surface processing part 40 is set smaller than the arrangement interval in the circumferential direction C of the plurality of columnar parts 32 of the end face processing part 30. For example, the spacing between the pillars 42 in the circumferential direction C is set to half the spacing between the pillars 32 in the circumferential direction C.

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 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. 4, the side surface processing section 40 connects a plurality of column sections 42, for example, three column sections 42a, 42b, 42c, arranged along the Z direction, 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 first and second corrugated plate portions 45, 46. The first and second 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 rectangular wave parts 45a, and the second corrugated plate part 46 has a plurality of rectangular wave parts 46a. The rectangular wave portions 45a and 46a have a trapezoidal shape with the bottom side omitted. The first and second corrugated plate portions 45 and 46 are stacked so that the respective rectangular wave portions 45a and 46a face each other in the circumferential direction C. By providing the rectangular wave parts 45a and 46a so as to face each other, each column part 42a, 42b, and 42c is formed. The first and second corrugated plate portions 45 and 46 are bonded together at the connecting portion 44 with an adhesive (not shown).

As shown in FIG. 2, 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 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 processing portion 40 and holds the plurality of pillar portions 42 . The holding material 47 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 are set at substantially the same height as the pillar portions 32, 42. The holding members 37 and 47 are made of a material having a lower elastic modulus than the columnar parts 32 and 42. That is, the holding members 37 and 47 are formed of a material that is more easily deformed by external force and has a greater amount of wear due to friction with the workpiece W than the pillar portions 32 and 42. When processing the workpiece W with the grindstone 10, the holding members 37 and 47 are more easily ground and elastically deformed than the columnar parts 32 and 42. Therefore, as shown in FIG. 3, 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 material 37 is also similar to the holding material 47. Therefore, the holding members 37 and 47 are suppressed from protruding further toward the workpiece W than the pillars 32 and 42, and do not inhibit the processing of the workpiece W by the pillars 32 and 42.
The holding members 37 and 47 are formed of a porous material that allows a gas or liquid fluid to pass therethrough. The holding materials 37 and 47 are made of porous resin or ceramic, for example.

As shown in FIG. 3, 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, or ceramic. The columnar section 32, like the columnar section 42, includes a plurality of abrasive grains and a bonding material.
As shown in FIG. 3, 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 material 37 also includes a plurality of dressing grains.

As shown in FIG. 1, the coolant liquid supply section 28 supplies coolant liquid Clt to the grindstone 10.
Fluid passage holes 21 , 22 , 23 , and 24 are formed in the grindstone holder 20 . When the fluid passage holes 21, 22, 23, and 24 are one set, the plurality of fluid passage holes 21, 22, 23, and 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 inlet 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 each extends along the radial direction R of the grindstone 10. One end of the fluid passage holes 22, 23, 24 on the inside in the radial direction R is connected to the fluid passage hole 21, and the other end of the fluid passage hole 22, 23, 24 on the outside in the radial direction R is an outflow end 22o, 23o, 24o. is located on the side peripheral surface of the grindstone holder 20. The outflow ends 22o, 23o, and 24o face a holding member 47 formed of a porous material. The coolant liquid Clt enters the fluid passage holes 21, 22, 23, and 24 through the inflow end 21i, and the centrifugal force that acts when the grindstone 10 rotates causes the coolant liquid Clt to flow into the fluid passage holes 22, 23, and 24 at their outflow ends. 22o, 23o, and 24o, and is discharged to the outside of the grindstone 10 in the radial direction R via the holding material 47.

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 workpiece W is processed. As shown in FIG. 5, in the whetstone 10, column parts 42 having abrasive grains 15 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. 6, 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. Thereby, 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 amount of machining 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 causes the end surface 31 of the grindstone 10 to come into contact with the workpiece W while rotating the grindstone unit 1 together with the shaft 25 around the rotation axis O 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 coolant liquid Clt onto the upper surface of the grindstone 10 via the coolant liquid supply section 28 while the workpiece W is being processed by the grindstone 10. The coolant liquid Clt then enters the fluid passage hole 21 via the inflow end 21i. A centrifugal force acts on the coolant liquid Clt outward in the radial direction R in the fluid passage hole 21 as the grindstone 10 rotates. Under the influence of this centrifugal force, the coolant liquid Clt enters the fluid passage holes 22, 23, and 24 from the fluid passage hole 21. The coolant liquid Clt is discharged into the gap between the grindstone holder 20 and the grindstone 10 from the outflow ends 22o, 23o, 24o of the fluid passage holes 22, 23, 24 by centrifugal force. The coolant liquid Clt spreads throughout the 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 . The coolant liquid Clt then passes through the holding member 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 embodiment described above, the following effects are achieved.
(1) The grindstones 10 for processing the workpiece W are arranged on the side circumferential surface 41 of the grindstone 10 at intervals along the circumferential direction C of the grindstone 10, and extend in a direction intersecting the side circumferential surface 41 of the grindstone 10. A plurality of column parts 42 are provided. The column portion 42 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, in the grindstone 10, the pillar portions 42 having the abrasive grains 15 and the holding members 47 not having the abrasive grains 15 are alternately arranged along the circumferential direction C. As a result, as shown in FIG. 6, 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.
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.

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

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

(4) The plurality of pillar portions 42, which are an example of the plurality of first pillar portions, are provided on the side circumferential surface 41 of the grindstone 10 and extend in a direction intersecting the side circumferential surface 41. The grindstone 10 includes a plurality of pillars 32 that are provided on an end surface 31 orthogonal to the side peripheral surface 41 of the grindstone 10 and are examples of a plurality of second pillars that extend in a direction intersecting the end surface 31.
According to this configuration, two different types of processing are possible with one grindstone 10 using the side circumferential surface 41 and end surface 31 of the grindstone 10.

(5) The grindstone 10 is provided over the entire side circumferential surface 41 of the grindstone 10, is made of a porous material that has a lower modulus of elasticity than the pillars 42, and allows fluid to pass through, and holds the plurality of pillars 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 greater than that of a non-porous material. Therefore, the holding material 47 is suppressed from protruding further toward the workpiece W than the columnar part 42, and the holding material 47 is suppressed from interfering with the processing of the workpiece W by the columnar part 42.
Furthermore, the holding material 47 allows fluid to pass therethrough. Therefore, the fluid that has passed through the holding material 47 can be supplied between the grindstone 10 and the workpiece W. Thereby, the frictional heat generated between the grindstone 10 and the workpiece W can be cooled, and the chips can be discharged to the outside.
Furthermore, the holding material 47 has a lower elastic modulus than the columnar portion 42 and is more easily deformed than the columnar portion 42 when pressed by the workpiece W. Therefore, the holding material 47 is suppressed from protruding further toward the workpiece W than the columnar part 42, and the holding material 47 is suppressed from interfering with the processing of the workpiece W by the columnar part 42.

(6) The holding material 47 includes a plurality of dressing grains 47a. After the sharpening grains 47a fall off from the holding material 47, they sharpen the abrasive grains 15 by scraping the binding material 16.
According to this configuration, the abrasive grains 15 are sharpened, thereby suppressing a decrease in the processing ability of the grindstone 10.

(7) The cylindrical column portion 42a has rectangular wave portions 45a and 46a, respectively, and is shaped like a rectangular corrugated plate 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 parts 45 and 46 which are superimposed on each other.
According to this configuration, the cylindrical portion 42a can be formed by overlapping the two corrugated plate portions 45 and 46.

(8) The whetstone unit 1 includes a whetstone 10 formed in a cylinder shape with a bottom, and a whetstone holder 20 that is fixed in an internal space of the whetstone 10 and holds the whetstone 10. The grindstone holder 20 is formed with fluid passage holes 21, 22, 23, and 24 through which a coolant liquid Clt, which is an example of a fluid, passes. The fluid passage holes 21, 22, 23, and 24 have an inflow end 21i that is exposed to the outside so that the coolant liquid Clt can flow in, and at least a part of which is located opposite to the holding material 47, through the inflow end 21i. Outflow end portions 22o, 23o, and 24o are provided for causing the coolant liquid Clt that has flowed into the fluid passage holes 21, 22, 23, and 24 to flow 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 , and 24 . The coolant liquid Clt passes through the holding member 47 and is supplied between the grindstone 10 and the workpiece W. Thereby, 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 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, in the machine tool 5, the processing amount K of the grindstone 10 can be increased more than that of a conventional grindstone, and a decrease in the processing ability of the grindstone 10 is suppressed.

(Modified example)
Note that the above embodiment can be implemented in the following forms with appropriate changes.
In the above embodiment, the fluid passage holes 21, 22, 23, and 24 of the grindstone holder 20 may be omitted. Moreover, the coolant liquid supply section 28 may be omitted.

In the embodiment described above, the columnar portions 32 and 42 are formed in a regular hexagonal cylindrical shape, but the columnar portions 32 and 42 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 and 42 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 and 42 do not have to be polygonal cylinders as long as they are cylindrical, and may be cylindrical. Hereinafter, modifications of the column 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 column parts 142 are arranged in one row along the circumferential direction C. The plurality of pillar portions 142 are provided in the same direction. The column 142 includes two walls 143 and 144 that intersect at different angles. The angle formed by the two wall portions 143 and 144 may be either an acute angle or an obtuse angle. Further, the two wall portions 143 and 144 may be formed integrally or may be formed separately.
Furthermore, in the example of FIG. 7, only one columnar portion 142 is provided in the Z direction, but two or more columnar portions 142 may be provided side by side in the Z direction.
The rigidity of the column 142 can be increased because the column 142 has two walls 143 and 144 that intersect at different angles. Further, since the side surface processing portion 40 in FIG. 7 has a gap penetrating in the Z direction, fluid can easily pass through in the Z direction.

Further, for example, as shown in FIG. 8, L-shaped pillar portions 343, 344, and 345 may be combined. The inner surface 344a of the column 344 is bonded to the inner surface 343a of the column 343, and the inner surface 345a of the column 345 is bonded to the inner surface 343b of the column 343. The pillar portion 343, the pillar portion 344, and the pillar portion 345 face in opposite directions. In this way, by combining a plurality of L-shaped pillars, 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 pillars, the area where the pillars overlap increases, and the rigidity of the pillars can be increased. Further, since the side surface processing portion 40 in FIG. 8 has a gap penetrating in a direction inclined with respect to the Z direction, 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 column parts 242 are arranged along the circumferential direction C. The plurality of column parts 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 top in the Z direction.
Each column 242 includes two substantially V-shaped walls 243 and 244, respectively. The wall portions 243 and 244 each include two plate portions 251 and 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 bonded. 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 column parts 242, chips and coolant liquid Clt can be discharged to the outside through this gap.
Furthermore, the columnar portion is not limited to the example shown in FIG. 9, and may be formed into a Y-shape by overlapping three substantially V-shaped wall portions. In this case, a substantially V-shaped wall portion 248 shown by a dashed line in FIG. 9 is provided along the opposing inner surfaces of the plate portion 252 of the wall portion 243 and the plate portion 252 of the wall portion 244. That is, one of the two outer surfaces of the wall 248 is bonded to one of the two outer surfaces of the wall 244, and the other of the two outer surfaces of the wall 248 is bonded to one of the two outer surfaces of the wall 243. The other of the two outer surfaces of the wall section 244 is bonded to the other of the two outer surfaces of the wall section 243. This increases the portion where the pillars overlap, thereby increasing the rigidity of the pillars. Moreover, the strength balance of the column part 242 constituted by the three wall parts 243, 244, and 248 is improved.
Furthermore, as shown in FIG. 10, even if a plurality of abrasive grains 215 for processing the workpiece W are mixed into the adhesive 249 that bonds the three substantially V-shaped wall portions 243, 244, and 248, good. The adhesive 249 is, for example, epoxy resin. By including the plurality of abrasive grains 215 in the adhesive 249, the processing ability of the grindstone 10 can be improved.
In addition, when the three walls 243, 244, 248 are bonded with the adhesive 249 containing a plurality of abrasive grains 215, the abrasive grains 15 contained in the walls 243, 244, 248 of the columnar part 242 (Fig. 3) may be omitted. Further, the adhesive 249 containing the abrasive grains 215 may be used not only for the modification shown in FIG. 10 but also for bonding the walls or pillars in each of the above embodiments or each modification.
Furthermore, the pillar portion 242 is not limited to the Y-shape, but may be formed in a V-shape, L-shape, X-shape, N-shape, U-shape, Z-shape, C-shape, or I-shape. good.
Note that, similar to the columnar portion of the side surface processing portion 40, the shape of the columnar portion 32 of the end surface processing portion 30 can also be changed as appropriate.

In the embodiment described above, the grindstone 10 includes the end surface processing section 30 and the side surface processing section 40, but the end surface processing section 30 may be omitted.

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. The pillar portion 32 does not need to be orthogonal to the side circumferential surface 41 as long as it is in a direction intersecting the end surface 31.

In the embodiment described above, the connecting portion 44 connects the two pillar portions 42 adjacent in the Z direction, but is not limited to this. For example, the connecting portion 44 connects the two pillar portions 42 adjacent in the circumferential direction C. Good too.

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

Claims (9)

A grindstone for processing a workpiece,
They are arranged discontinuously at intervals along the circumferential direction of the grindstone on the side circumferential surface of the grindstone, extend in a direction intersecting the side circumference of the grindstone , are each formed in a cylindrical shape, and are arranged in a discontinuous manner at intervals along the circumferential direction of the grindstone. multiple pillars to be processed ;
a holding material provided on the side circumferential surface of the grindstone and filled in the internal spaces and external spaces of the plurality of columnar parts to hold the plurality of columnar parts and not process the workpiece; ,
The pillar portion is
a plurality of abrasive grains that are distributed over the entire area of the column and come into contact with the workpiece when processing the workpiece;
A binding material that binds the plurality of abrasive grains ,
The spacing in the circumferential direction between the plurality of pillars is such that some of the pillars are in contact with the workpiece during machining in which the grindstone is rotated about its rotation axis and the side circumferential surface is brought into contact with the workpiece. The state is set to alternately change between a state in which the column is in contact with the workpiece and a state in which only the holding material is in contact with the workpiece without the pillar portion contacting the workpiece.
Whetstone. The grindstone is formed into a cylindrical shape with a bottom,
The grindstone is a column part different from the plurality of first column parts that are the plurality of column parts, is provided on an end face intersecting the side peripheral surface, and is formed in a cylindrical shape extending in a direction intersecting the end face, comprising a plurality of second column parts arranged at intervals along the circumferential direction of the grindstone ;
The grindstone according to claim 1 . The arrangement interval in the circumferential direction of the plurality of first pillar parts is set to half the arrangement interval in the circumferential direction of the plurality of second pillar parts,
The grindstone according to claim 2. The plurality of first pillar portions are provided at the same position as the second pillar portion every other column in the circumferential direction.
The grindstone according to claim 3. The pillar portion includes a plurality of integral wall portions that intersect with each other at different angles.
The whetstone according to any one of claims 1 to 4 . The holding material includes a plurality of sharpening grains,
After the sharpening grains fall off from the holding material, the binding material is scraped to sharpen the abrasive grains.
The whetstone according to any one of claims 1 to 5 . The cylindrical pillar portions each have a rectangular corrugated portion and are shaped like a rectangular corrugated plate extending in a direction along the rotation axis of the grindstone, and are stacked so that the rectangular corrugated portions face each other in the circumferential direction of the grindstone. formed by two corrugated plate parts,
The whetstone according to any one of claims 1 to 6 . A grindstone unit comprising the grindstone according to any one of claims 1 to 7 , and a grindstone holder that is fixed to an internal space of the grindstone formed in a bottomed cylindrical shape and holds the grindstone. hand,
The holding material is formed of a porous material that allows fluid to pass through,
A plurality of first and second fluid passage holes through which a fluid passes are formed in the grindstone holder,
The plurality of first fluid passage holes extend along the rotation axis of the grindstone and are arranged at intervals in the circumferential direction of the grindstone,
The plurality of second fluid passage holes each extend along the radial direction of the grindstone, are arranged at intervals in the circumferential direction of the grindstone, and the radially inner end of the grindstone is connected to the first fluid passage hole. connected so that fluid can enter and exit the
Each of the plurality of first fluid passage holes is located on the upper surface of the grindstone holder and includes an inflow end exposed to the outside so that fluid can flow therein,
Each of the plurality of second fluid passage holes is located at a radially outer end of the grindstone, and allows fluid to flow in from the inflow end and pass through the first and second fluid passage holes to the holding material. comprising an outflow end for directing the outflow;
Grinding wheel unit. A grindstone according to any one of claims 1 to 7 ,
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.