Dressing tool, method of using grinding wheel, and grinding wheel

Abstract

To provide a dressing tool capable of easily performing dressing, a method of using a grinding wheel, and the grinding wheel.SOLUTION: A dressing tool 50 dresses a grinding wheel 10 having a plurality of processing parts 11 erected on a processing surface 10a for polishing or grinding a workpiece, and a core material 19 filled around the plurality of processing parts 11 and holding the plurality of processing parts 11. The dressing tool 50 includes a plurality of dressing abrasive grains, and a plurality of dressing wires 51 having a flexible body having flexibility while holding the plurality of dressing abrasive grains. The plurality of dressing wires 51 are configured to move relative to the processing surface 51a in a state where each dressing tip end 10a is bent while being pressed against the processing surface 10a, thereby wearing the core material 19 with a larger wear amount than each processing portion 11 in order to realize a state where the processing tip end 10a on the processing surface 11a side of each processing portion 11 protrudes from the core material 19.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a dressing tool, a method for using a grinding wheel, and a grinding wheel. [Background technology]

[0002] For example, the grindstone described in Patent Document 1 includes a plurality of processing portions extending in a direction perpendicular to the processing surface, and a holding portion that holds the plurality of processing portions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-9740 Summary of the Invention [Problem to be solved by the invention]

[0004] In the grinding wheel described in Patent Document 1, in order to improve the sharpness of the grinding wheel, it is preferable to dress the processing surface so that the processing portion protrudes beyond the holding portion, but it has been difficult to dress in this way.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a dressing tool that allows easy dressing, a method for using a grindstone, and a grindstone. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the dressing tool according to the first aspect of the present invention is a dressing tool for dressing a grinding wheel having a plurality of processing portions that are erected against a processing surface that polishes or grinds a workpiece, and a core material that is filled around the plurality of processing portions and holds the plurality of processing portions, and is equipped with a plurality of dressing grains and a plurality of dressing materials that have flexible bodies that are flexible while holding the plurality of dressing grains, and the plurality of dressing materials are configured so that each dressing tip is pressed against the processing surface and bent, and then slides relative to the processing surface, thereby wearing the core material to a greater extent than each of the processing portions, in order to achieve a state in which the processing tip on the processing surface side of each of the processing portions protrudes beyond the core material.

[0007] In addition, the multiple dressing materials may each be linear and configured to form a bundle as a whole, and the dressing abrasive grains may be formed of a material harder than the core material that the dressing abrasive grains wear down.

[0008] In order to achieve the above object, a method of using a grinding wheel according to a second aspect of the present invention includes a dressing step of dressing the grinding wheel using the dressing tool, and a processing step of processing the workpiece with the dressed grinding wheel, wherein in the dressing step, the dressing tip of the dressing tool is brought into contact with the processing surface of the grinding wheel and the dressing tool is slid relative to the processing surface, causing the processing tip to protrude beyond the core material; and in the processing step, the workpiece is processed by sliding the processing surface relative to the workpiece while supplying liquid from a liquid supply unit so that the liquid enters between the processing surface and the workpiece, and the core material of the grinding wheel is formed of a material and / or structure that is more easily worn than the processing portion of the grinding wheel, so that the core material is worn more than the processing portion of the grinding wheel and maintains the protruding state due to the action of the water pressure of the liquid and the shavings from the workpiece.

[0009] In order to achieve the above object, a grinding wheel according to a third aspect of the present invention is a grinding wheel that is dressed with the dressing tool, and the proportion of the multiple processing portions to the entire area of ​​the processing surface is set to 10% or less.

[0010] In addition, the grinding wheel may be configured to be rotatable around a rotation axis, the machining surface may have a circular or annular shape centered on the rotation axis, and the multiple machining portions may be plate-shaped extending in a direction inclined relative to the radial direction of the machining surface. [Effects of the Invention]

[0011] According to the present invention, dressing can be easily performed. [Brief explanation of the drawings]

[0012] [Figure 1] (A) is a side view of a dressing tool according to one embodiment of the present invention, (B) is a plan view of the dressing tool, (C) is an enlarged view of a portion of (B), and (D) is a cross-sectional view of line 1D-1D of (C). [Figure 2] FIG. 2 is a bottom view of the grinding wheel unit according to the embodiment of the present invention. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. [Figure 4] (A) is a partial cross-sectional view of a grinding wheel and a dressing tool during dressing in one embodiment of the present invention, (B) is a partial cross-sectional view of a grinding wheel after dressing in one embodiment of the present invention, and (C) is a partial cross-sectional view of a grinding wheel during workpiece machining in one embodiment of the present invention. [Figure 5] FIG. 10 is a schematic cross-sectional view of a grinding wheel unit according to a modified example of the present invention. [Figure 6] 10A and 10B are diagrams illustrating a movement mode of a dressing wire relative to a processing portion according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0013] A dressing tool, a method of using a grindstone, and a grindstone according to one embodiment of the present invention will be described with reference to the drawings.

[0014] As shown in FIG. 3, the dressing processing system 2 includes a liquid supply unit 28, a grinding wheel unit 1, a rotation drive unit 27, a dressing tool 50, a dressing tool drive device 5, and a control unit 8.

[0015] The dressing tool 50 is, for example, a nylon brush containing abrasive grains, and is made of bristles made of nylon fibers mixed with abrasive grain material (alumina, silicon carbide, diamond powder, etc.). The dressing tool 50 is a core dressing brush that dresses the core material of the grinding wheel. As shown in FIGS. 1(A) to 1(C), the dressing tool 50 includes a plurality of dressing wires 51 and a substrate 52. The base material 52 is made of metal or resin and holds a plurality of dressing wires 51. The base material 52 is, for example, disk-shaped, and supports the plurality of dressing wires 51 on a support surface 52a (the upper surface in FIG. 1(A)) of one of both flat surfaces of the base material 52.

[0016] The multiple dressing wires 51 are configured as a bundle of brushes, and the lower end of each dressing wire 51 is supported on a support surface 52a of the substrate 52. As shown in FIG. 1(B), the multiple dressing wires 51 are configured as a bundle of brushes that form an annular ring when viewed from the direction in which the dressing wires 51 extend. The dressing wire 51 has a dressing tip 51a located at the end opposite to the support surface 52a. The dressing tip 51a dresses the grinding wheel 10 by being pressed against the processing surface 10a of the grinding wheel 10 (described later) and sliding on the processing surface 10a. As shown in FIG. 4(A), the plurality of dressing wires 51 are flexible so that they bend when their respective dressing tips 51a are pressed against the processing surface 10a.

[0017] As shown in FIG. 1(D), the dressing wire 51 includes a plurality of dressing abrasive grains 53 and a flexible body 54. The plurality of dressing abrasive grains 53 polish or grind the processing surface 10a (particularly the core material 19 described below) by contacting with the processing surface 10a. The plurality of dressing abrasive grains 53 are made of one or more types selected from, for example, alumina, silicon carbide, diamond, silicon, zirconia, emery, glass, carbide, coke, bauxite, volcanic ash, cerium oxide, shells, seaweed, minerals, sawdust, stainless steel, iron or iron alloy, gold, silver, copper, phosphor bronze, aluminum, Inconel, sand, and duralumin. The flexible body 54 is made of a flexible (elastic) linear resin or ceramic, and holds a plurality of dressing abrasive grains 53 inside.

[0018] As shown in FIG. 3, the grindstone unit 1 includes a grindstone 10 for processing a workpiece W, a grindstone holder 20 for holding the grindstone 10, and a shaft 25.

[0019] The grinding wheel holder 20 is substantially disk-shaped. A cylindrical shaft 25 is inserted through the center of the grinding wheel holder 20. The grinding wheel holder 20, together with the grinding wheel 10, rotates by receiving a driving force from a rotation drive unit 27 around a rotation axis O passing through the center of the shaft 25. The grinding wheel 10 rotates with a workpiece W fixed to a chuck (not shown) in contact with a processing surface 10a, which is the underside of the grinding wheel 10. In this way, the grinding wheel 10 processes, i.e., polishes or grinds, the workpiece W. The workpiece W is, for example, ceramics, a silicon wafer, a semiconductor substrate, an LED (Light Emitting Diode) substrate, a heat dissipation substrate, silicon carbide, alumina, sapphire, or a metal.

[0020] 2, the grinding wheel 10 has a circular, flat plate shape, and either the front or back surface serves as the processing surface 10a. The grinding wheel 10 includes a plurality of processing portions 11 extending in a direction perpendicular to the processing surface 10a, and a core material 19 that holds the plurality of processing portions 11. Each processing portion 11 is flat and extends in a direction inclined at an angle θ with respect to the radial direction R of the circular processing surface 10a, and extends in a direction along the rotation axis O. The angle θ forms an acute angle and is set preferably to 30° to 70°, and more preferably to 40° to 60°. The angle θ may be outside these ranges.

[0021] The multiple processing portions 11 are arranged in a dashed line along a direction inclined at an angle θ with respect to the radial direction R, and the processing portions 11 arranged in a dashed line in one line are arranged at a predetermined angular interval (e.g., intervals of 2° to 8°) in the circumferential direction C of the processing surface 10a. The processing tip 11a (see FIGS. 4(B) and (C)) on the processing surface 10a side of the processing part 11 polishes or grinds the workpiece W while being cut. Each processing part 11 is formed to have the same shape and size.

[0022] The ratio of the area of ​​the multiple processing parts 11 (more precisely, the area of ​​the processing tip parts 11a) to the total area of ​​the processing surface 10a is set to 10% or less, preferably 1% to 10%, and more preferably 2.5% to 10%. By reducing this ratio, it is possible to increase the processing pressure of the multiple processing parts 11 on the workpiece W. Note that this ratio may be outside the above-mentioned numerical ranges. As shown in FIG. 3, both ends of each processing portion 11 in the direction along the rotation axis O are exposed on the front and back surfaces of the grinding wheel 10, respectively.

[0023] As shown in Fig. 3, the core material 19 is formed over the entire processing surface 10a and holds a plurality of processing portions 11. The core material 19 is filled around each processing portion 11. Each processing portion 11 is embedded in the core material 19 with each processing tip 11a exposed to the processing surface 10a. In this example, the tip and rear end of each processing portion 11 are exposed on both sides of the grinding wheel 10, and the grinding wheel 10 is formed symmetrically on both sides.

[0024] The core material 19 is made of a material and structure that is more easily deformed by external forces than the processing portion 11 and more easily worn during processing than the processing portion 11. The core material 19 is made of a material that is softer, i.e., has a lower hardness, than the dressing abrasive grains 53, and is made of, for example, a vitrified bond, a resinoid bond, a metal bond, or an electroplated bond. The core material 19 is made of a porous body that allows fluid to pass through. The porosity of the core material 19 is set to 20 to 60%. The core material 19 may be formed so that fluid cannot pass through.

[0025] As shown enlarged in the lower part of Fig. 3, the processing unit 11 includes a plurality of processing abrasive grains 15 and a binder 16. The plurality of processing abrasive grains 15 are distributed within the binder 16. The processing abrasive grains 15 are made of a material that is harder, i.e., has a higher hardness, than the dressing abrasive grains 53, such as diamond. Note that the processing abrasive grains 15 are not limited to diamond, and may be cubic boron nitride (CBN) abrasive grains, or a mixture of CBN abrasive grains and diamond. The plurality of processing abrasive grains 15 may be made of silicon carbide, alumina, or a mixture of these. The binder 16 holds a plurality of processing abrasive grains 15 therein. The binder 16 is made of metal such as nickel, iron, aluminum, copper, etc., aluminum alloy, bronze, etc., resin such as phenolic resin, epoxy resin, etc., ceramic, etc.

[0026] 3, the control unit 8 controls the liquid supply unit 28, the rotation drive unit 27, and the dressing tool drive device 5 to dress the grinding wheel 10 and process the workpiece W with the grinding wheel 10. The control unit 8 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc.

[0027] The liquid supply unit 28 supplies the liquid A, which is a coolant liquid, so that the liquid A penetrates between the processing surface 10a of the grinding wheel 10 and the workpiece W. The dressing tool driving device 5 rotates the dressing tool 50 about a rotation axis J while gripping the substrate 52 of the dressing tool 50. The rotation axis J extends in the extension direction of each dressing wire 51 and passes through the center of the substrate 52.

[0028] Next, a method for dressing the grinding wheel 10 with the dressing tool 50 will be described. As shown in Figure 4(A), before dressing, the grinding wheel 10 has the cutting tip 11a of the processing portion 11 not protruding from the core material 19, and the cutting tip 11a is at approximately the same height as the surface of the core material 19 on the processing surface 10a side. Even if the grinding wheel 10 in this state is used to process a workpiece W, the core material 19 distributes the processing pressure of the grinding wheel 10, making it difficult for the processing pressure to increase at the processing portion 11, resulting in poor cutting performance. Therefore, the following dressing is required.

[0029] The control unit 8 rotates the dressing tool 50 about the rotation axis J while holding the dressing tool 50 via the dressing tool drive device 5, and presses the dressing tip 51a against the processing surface 10a of the grinding wheel 10. As a result, the dressing tip 51a slides on the processing surface 10a, causing the core material 19 to wear more than the processing portion 11, and dressing is performed in which the processing tip 11a protrudes from the core material 19. When this dressing is complete, as shown in Figure 4(B), the processing tip 11a of the processing portion 11 protrudes from the core material 19 by a protrusion amount ΔD. The protrusion amount ΔD is 10 μm to 20 μm. If the protrusion amount ΔD is smaller than this numerical range, the processing pressure of the processing portion 11 will be insufficient, and if it is larger than this numerical range, there is a risk that the processing portion 11 will not be able to be stably held by the core material 19.

[0030] During the above-mentioned dressing, each dressing wire 51 receives a reaction force from the processing surface 10a and becomes bent (see FIG. 4(A)), thereby adjusting the force with which the dressing tip 51a presses the processing surface 10a. This prevents excessive wear of the processing portion 11 and unnecessary wear of the core material 19.

[0031] During the above-described dressing, the control unit 8 rotates the grinding wheel 10 around the rotation axis O via the rotation drive unit 27. This causes both the grinding wheel 10 and the dressing tool 50 to rotate, making it possible to dress the entire processing surface 10a at high speed. This also diversifies the direction in which each dressing tip 51a, which is the tip of the brush, enters the processing area 11, thereby reducing unevenness in the amount of wear of the core material 19.

[0032] Next, a method for machining the workpiece W with the dressed grinding wheel 10 will be described. As shown in FIG. 4(C), the control unit 8 supplies liquid A via the liquid supply unit 28, rotates the grinding wheel 10 about the rotation axis O via the rotation drive unit 27, and brings the workpiece W into contact with the processing surface 10a. As a result, the processing tip 11a of the processing unit 11 slides and rotates relative to the workpiece W, polishing or grinding the workpiece W. At this time, liquid A enters between the processing surface 10a and the workpiece W, applying the water pressure of liquid A to the processing surface 10a, and shavings from the workpiece W enter between the processing surface 10a and the workpiece W. Due to these actions, even if the grinding wheel 10 wears by a predetermined amount ΔE as the workpiece W is processed, the processing tip 11a of the processing unit 11 remains protruding by a protrusion amount ΔD relative to the core material 19. In other words, the core material 19 is formed of a material or structure (porosity) that is more easily worn than the processing unit 11, so that this state is maintained. The softer the core material 19 is and the greater the porosity of the core material 19, the more easily it is worn.

[0033] (effect) According to the embodiment described above, the following effects are achieved. (1) The dressing tool 50 dresses a grinding wheel 10 having a plurality of processing portions 11 erected on a processing surface 10a for polishing or grinding a workpiece W, which is an example of a workpiece, and a core material 19 filled around the processing portions 11 to hold the processing portions 11. The dressing tool 50 includes a plurality of dressing wires 51, which are an example of a plurality of dressing materials, having a plurality of dressing grains 53 and a flexible body 54 that is flexible and holds the plurality of dressing grains 53. The plurality of dressing wires 51 are configured to wear the core material 19 by a greater amount than each of the processing portions 11, by moving relative to the processing surface 10a while their respective dressing tips 51a are pressed against the processing surface 10a and bent, thereby realizing a state in which the processing tips 11a of each of the processing portions 11 on the processing surface 10a side protrude beyond the core material 19. According to this configuration, the dressing tool 50 can easily dress the processed tip 11 a of each processed portion 11 so that it projects beyond the core material 19 .

[0034] (2) The dressing wires 51 are each wire-shaped and configured to form a bundle as a whole. The dressing abrasive grains 53 are formed of a material harder than the core material 19 of the grinding wheel 10 that the dressing abrasive grains 53 wear down. According to this configuration, multiple dressing wires 51 are formed into a brush-like bundle of wires, which makes it easier for the dressing tip 51a to come into contact with the core material 19 around the processing portion 11, thereby reducing unevenness in the amount of wear of the core material 19.

[0035] (3) The method of using the grinding wheel 10 includes a dressing step of the grinding wheel 10 using a dressing tool 50, and a processing step. In this dressing step, the dressing tip 51a of the dressing tool 50 is brought into contact with the processing surface 10a of the grinding wheel 10, and the dressing tool 50 is moved relative to the processing surface 10a, causing the processing tip 11a to protrude beyond the core material 19. In this processing step, the liquid supply unit 28 supplies liquid A so that it penetrates between the processing surface 10a and the workpiece W, while the processing surface 10a is slid relative to the workpiece W to process the workpiece W. In this processing step, the core material 19 of the grinding wheel 10 is formed of a material (material) and structure (porosity) that is more easily worn than the processing portion 11 of the grinding wheel 10, so that the core material 19 is worn down by 10 μm to 20 μm more than the processing portion 11 of the grinding wheel 10 due to the action of the water pressure of liquid A and shavings from the workpiece W, thereby maintaining the protruding state. According to this configuration, it is possible to maintain the grinding wheel 10 in the protruding state even when the workpiece W is being machined, and the sharpness of the grinding wheel 10 can be maintained.

[0036] (4) In the grinding wheel 10 that is dressed by the dressing tool 50, the ratio of the multiple processing portions 11 to the entire area of ​​the processing surface 10a is set to 10% or less. According to this configuration, the presence of the processing portion 11 prevents wear of the core material 19 in the dressing tool 50. Therefore, from the viewpoint of dressing, it is preferable that the proportion of the entire processing portion 11 to the entire area of ​​the processing surface 10a be set to 10% or less.

[0037] (5) The grinding wheel 10 is configured to be rotatable about a rotation axis O. The processing surface 10a has a circular or annular shape centered on the rotation axis O. The multiple processing portions 11 have a plate shape extending in a direction inclined at an angle θ with respect to the radial direction R of the processing surface 10a. 6, when each dressing wire 51 moves relative to the processing portion 211 in a movement direction M along the thickness direction of the processing portion 211, the tip of each dressing wire 51 does not easily contact the area Ar at the back of each processing portion 211, or the tip of the dressing wire 51 hits hard due to the restoring force when it is released from the state where it has been caught on the tip of the processing portion 211. These are the causes of uneven wear of the core material 19. In this regard, according to the above configuration, each processing portion 11 is inclined with respect to the radial direction R, so that the dressing wire 51 is less likely to move in the thickness direction of the processing portion 11, and unevenness in the amount of wear of the core material 19 in the rear region of each processing portion 11 can be suppressed.

[0038] The present invention is not limited to the above-described embodiments and drawings. Modifications (including the omission of components) can be made as appropriate within the scope of the present invention. An example of a modification will be described below.

[0039] (Variation) In the above embodiment, the multiple processing portions 11 extend in a direction inclined at an angle θ with respect to the radial direction R of the processing surface 10a, but this is not limited to this and they may extend in the radial direction R or in the circumferential direction C. In the above embodiment, the processed portion 11 is plate-shaped, but is not limited to this, and may be cylindrical, polygonal tubular, columnar, or polygonal pillar-shaped. In the above embodiment, each processing portion 11 is perpendicular to the processing surface 10a, but this is not limiting and the processing portion 11 may be inclined. Furthermore, the processing portion 11 does not necessarily have to contain a plurality of processing abrasive grains 15. In this case, the processing portion 11 is made of a metal such as a cemented carbide alloy. In the above embodiment, the processing surface 10a has a planar annular shape, but may have a planar circular shape.

[0040] In the above embodiment, the grinding wheel 10 processes the workpiece W at its bottom surface, but as shown in FIG. 5, the grinding wheel 110 may process the workpiece W with its cylindrical outer peripheral surface serving as the processing surface 110a. In this case, each processing portion 111 is configured to extend in the radial direction R and stand upright. This grinding wheel 110 can also be dressed by the dressing tool 50, as in the above embodiment. Furthermore, both the bottom surface and the outer peripheral surface of the grinding wheel may be configured as processing surfaces.

[0041] In the above embodiment, the liquid supply unit 28 supplied liquid A directly to the machining surface 10a, but liquid A may also be supplied toward the surface of the grinding wheel 10 opposite the machining surface 10a, so that it passes through the inside of the core material 19, which is composed of a porous body of the grinding wheel 10, and reaches the machining surface 10a. 3, a flow path 25R for the liquid A may be formed inside the shaft 25, and the liquid A may pass through the flow path 25R and reach the processing surface 10a. In the above embodiment, the liquid supply unit 28 may be omitted.

[0042] In the above embodiment, the grinding wheel 10 may be stopped and not rotated during dressing. In this case, the dressing tool driving device 5 may rotate the dressing tool 50 about the rotation axis J while revolving the dressing tool 50 around the rotation axis O along the processing surface 10a so that the dressing tip 51a dresses the processing surface 10a. Note that this rotation does not have to be performed. Instead of rotating the dressing tool 50 on its axis, the dressing tool driving device 5 may also cause the dressing tool 50 to reciprocate linearly in conjunction with the rotation. In the above embodiment, the dressing wire 51 may be in the form of a flat plate as long as it has flexibility. Alternatively, the dressing of the grinding wheel 10 may be performed manually by an operator using the dressing tool 50. In the above embodiment, the shape of the dressing tool 50 can be changed as appropriate. [Explanation of symbols]

[0043] 1...grinding wheel unit, 2...dressing processing system, 5...dressing tool drive device, 8...control unit, 10,110...grinding wheel, 10a,110a...processing surface, 11,111,211...processing unit, 11a...processing tip, 15...processing abrasive grain, 16...bonding material, 19...core material, 20...grinding wheel holder, 25...shaft, 25R...flow path, 27...rotation drive unit, 28...liquid supply unit, 50...dressing tool, 51...dressing wire, 51a...dressing tip, 52...substrate, 52a...support surface, 53...dressing abrasive grain, 54...flexible body, θ...angle, A...liquid, C...circumferential direction, ΔD...protrusion amount, J,O...rotation axis, M...movement direction, R...radial direction, W...workpiece, Ar...area

Claims

1. A dressing tool for dressing a grindstone having a plurality of processing portions that are erected on a processing surface that polishes or grinds a workpiece, and a core material that is filled around the plurality of processing portions and holds the plurality of processing portions, a plurality of dressing materials each having a plurality of dressing abrasive grains and a flexible body that holds the plurality of dressing abrasive grains and has flexibility; The plurality of dressing materials are configured such that the core material is worn to a greater extent than each of the processing portions, in order to realize a state in which the processing tip of each of the processing portions on the processing surface side protrudes beyond the core material, by sliding relatively against the processing surface while the respective dressing tip portions are pressed against the processing surface and bent. Dressing tools.

2. The plurality of dressing materials are each linear and configured to form a bundle as a whole, The dressing abrasive grains are formed of a material harder than the core material that the dressing abrasive grains wear. The dressing tool of claim 1 .

3. a dressing step of dressing the grindstone using the dressing tool according to claim 1 or 2, and a processing step of processing the workpiece with the dressed grindstone, In the dressing step, the dressing tool is slid relatively against the processing surface in a state where the dressing tip of the dressing tool is in contact with the processing surface of the grinding wheel, so that the processing tip protrudes beyond the core material; In the machining step, the workpiece is machined by sliding the machining surface relative to the workpiece while supplying a liquid from a liquid supply unit so that the liquid enters between the machining surface and the workpiece; The core material of the grinding wheel is formed of a material and / or structure that is more easily worn than the processing portion of the grinding wheel by the action of the water pressure of the liquid and the shavings of the workpiece in the processing step, so that the core material is worn more than the processing portion of the grinding wheel and maintains the protruding state. How to use a whetstone.

4. A grinding wheel to be dressed with the dressing tool according to claim 1 or 2, The proportion of the plurality of processed portions to the entire area of ​​the processed surface is set to 10% or less. Whetstone.

5. The grinding wheel is configured to be rotatable around a rotation axis, the processed surface has a circular or annular shape centered on the rotation axis, The plurality of processing portions are plate-shaped and extend in a direction inclined with respect to the radial direction of the processing surface. The grinding wheel according to claim 4.

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