JP2023018419A - Manufacturing method of polishing tool, and polishing tool - Google Patents

Abstract

To provide a manufacturing method of a polishing tool usable for polishing the surface of a metal or a ceramic; and to provide a polishing tool.SOLUTION: A manufacturing method of a polishing tool 1 includes a molding step for supplying glass particles into a mold in which the shape of a gripping part 4 is set, and molding the glass particles into a desired shape, and a firing step for heating the glass particle at a temperature over a softening point and below a melting point of the glass particle, after the molding step, and finishing heating in the state where bubbles are dispersed in gaps between the glass particles and remain there, to thereby form a glass block (tool body 2) as the polishing tool 1.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an abrasive tool used for polishing metal or ceramic surfaces, and the abrasive tool.

When the surface of metals and ceramics is processed, minute irregularities and minute protrusions called burrs may occur on the surface. An Arkansas whetstone is known as a whetstone used to remove such irregularities and burrs from the surface. Arkansas grindstones are used, for example, in processing equipment for processing workpieces such as semiconductor wafers, to scrape and remove burrs and adhering dust on the holding surface of a chuck table that holds the workpiece, and to support the chuck table. It is used for washing the table base manually by an operator (see Patent Document 1).

JP-A-10-166268

Arkansas whetstones are natural oilstones from Arkansas, USA. Arkansas whetstones are natural products, so they are expensive and valuable. Therefore, there is a demand for a polishing whetstone that can be used as a substitute for the Arkansas whetstone and a high-quality polishing whetstone with less variation than the Arkansas whetstone.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object thereof is to provide a new method for manufacturing a polishing tool and a polishing tool that can be used for polishing the surface of metals and ceramics.

In order to solve the above-described problems and achieve the object, the present invention provides a method for manufacturing a polishing tool having a gripping portion, wherein glass grains are placed in a mold in which the shape of the gripping portion is set. and a molding step of molding into a desired shape, and after the molding step, the glass grains are heated at a temperature exceeding the softening point of the glass grains and less than the melting point, so that bubbles are dispersed in the gaps between the glass grains. and a baking step of finishing the heating in the state where the glass remains and forming a glass block to be a polishing tool.

The glass block after performing the firing step may have a porosity of 2% or more and 8% or less.

After performing the baking step, a polishing step may be provided in which the working surface to be polished in contact with the object to be polished is polished to have a surface roughness (Ra) of 0.2 μm or more and 1.5 μm or less.

Further, in order to solve the above-described problems and achieve the object, the polishing tool of the present invention is a polishing tool for polishing the surface of metal or ceramics, and has a surface roughness (Ra) of 0.2 μm or more. It is made of a glass block having a thickness of 1.5 μm or less, a porosity of 2% or more and 8% or less, and having a grip portion formed thereon.

The abrasive tool may be free of abrasive grains.

The present invention can be used for polishing metal and ceramic surfaces.

FIG. 1 is a perspective view showing an example of a polishing tool according to an embodiment. FIG. 2 is a flow chart showing an example of the procedure of the method for manufacturing a polishing tool according to the embodiment. FIG. 3 is a cross-sectional view illustrating the molding step of FIG. 2; 4 is a cross-sectional view showing a mold used in the molding step of FIG. 2; FIG. 5 is a cross-sectional view illustrating the firing step of FIG. 2. FIG. 6 is a perspective view illustrating the polishing step of FIG. 2. FIG. FIG. 7 is a cross-sectional view explaining the polishing step of FIG. FIG. 8 is a perspective view showing an example of a polishing tool according to a modification.

A form (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions, or changes in configuration can be made without departing from the gist of the present invention.

[Embodiment]
A method for manufacturing a polishing tool and a polishing tool 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a polishing tool 1 that is an example of a polishing tool according to an embodiment. FIG. 2 is a flow chart showing an example of the procedure of the method for manufacturing a polishing tool according to the embodiment. FIG. 3 is a cross-sectional view explaining the molding step 1001 of FIG. FIG. 4 is a cross-sectional view showing a mold 10, which is an example of a mold used in the forming step 1001 of FIG. FIG. 5 is a cross-sectional view illustrating the firing step 1002 of FIG. FIG. 6 is a perspective view explaining the polishing step 1003 of FIG. FIG. 7 is a cross-sectional view illustrating the polishing step 1003 of FIG.

A polishing tool 1 according to the embodiment is manufactured by the method for manufacturing a polishing tool according to the embodiment shown in FIG. The object to be polished by the polishing tool 1 according to the embodiment is, in this embodiment, for example, the surface of metal or ceramics. They are the holding surface of the chuck table to be held and the surface of the table base that supports the chuck table.

In this embodiment, the tool body 2 is a glass block formed in a substantially rectangular shape, as shown in FIG. The tool body 2 has pores inside, and in this embodiment, the porosity, which is the ratio of the volume occupied by the pores to the total volume of the tool body 2, is 2% or more and 8% or less. For this reason, the tool body 2 has pores of an appropriate size and is appropriately dispersed therein. Since the tool body 2 has a porosity of 2% or more, it can appropriately retain the lubricating liquid used when polishing the object to be polished by the polishing tool 1 . Since the tool body 2 has a porosity of 8% or less, the pores are appropriately separated within the tool body 2, and the lubricating liquid does not penetrate excessively into the tool body 2, and a necessary amount of the lubricating liquid is supplied. It can remain on the surface (action surface 3) to make it easy to act.

If the porosity is less than 2%, it may become difficult to retain the lubricating liquid appropriately. In addition, if the porosity exceeds 8%, the pores will be connected inside, so the lubricating liquid will easily penetrate inside, and the necessary amount of lubricating liquid will not easily remain on the surface. There is If the porosity exceeds 8%, the pores exposed on the working surface are more likely to hit burrs on the object to be polished of the polishing tool, and the processing quality of the polishing tool may be likely to deteriorate.

The working surface 3 is a surface of the polishing tool 1 that contacts and polishes an object to be polished. be done. The working surface 3 is formed to have a surface roughness (Ra) of 0.2 μm or more and 1.5 μm or less in this embodiment. Here, the surface roughness (Ra) is the arithmetic mean height (Ra) of contour curve elements defined based on the surface roughness of Japanese Industrial Standards (JIS B 0601: 1994, JIS B 0031: 1994). , is the mean of the absolute values of the deviations from the height mean line at the reference length to the roughness curve. In addition, since the polishing tool 1 does not contain abrasive grains, the working surface 3 has extremely high flatness, and even if an object to be polished such as metal or ceramics is polished, damage such as scratches may occur on the surface to be polished. do not have.

The grip portion 4 is a portion that is gripped by an operator (human) who polishes an object to be polished with the polishing tool 1, and is a pair of surfaces (the left hand in FIG. The front side and the right rear side) are formed in shapes that are easy to grip with the finger pads of the operator's hands (bare hands or via protective equipment such as gloves). Specifically, the grip portion 4 has unevenness, preferably a curved surface. The unevenness of the grip part 4 is formed, for example, in a shape that creates a frictional force with the finger pad side of the operator's hand, or in a shape that catches the finger pad side of the operator's hand. By gripping the gripping portion 4 on the ventral side, it is possible to grip the polishing tool 1 more firmly. For example, as shown in FIG. 1, the curved surface of the grip portion 4 extends in a direction orthogonal to the action surface 3 and corresponds to a convex curved surface in a direction intersecting the direction in which the fingers extend on the finger pad side of the operator's hand. It is formed in a concave curved surface, and when the operator grips the gripping part 4 with the finger pad side of the hand, the convex curved surface and the concave curved surface on the finger pad side of the operator's hand come into contact with each other so that they are generally fitted. , the polishing tool 1 can be gripped more firmly, and the work surface 3 can be stably polished with an appropriate pressure.

Next, this specification demonstrates operation|movement of the manufacturing method of the abrasive tool which concerns on embodiment using drawing. The method for manufacturing a polishing tool according to the embodiment is a method for manufacturing the polishing tool 1 according to the embodiment shown in FIG. 1. As shown in FIG. , provided.

The forming step 1001 is, as shown in FIG. 3, a step of supplying the glass grains 100 to the mold 10 in which the shape of the grip portion 4 is set and forming it into a desired shape. Here, the formwork 10 used in the forming step 1001 has sufficient heat resistance under the high-temperature environment formed in the firing step 1002 described later, and does not chemically react with the glass grains 100 under this environment. It is formed of a material that does not connect with the glass grains 100 . As shown in FIG. 4, the mold 10 used in the molding step 1001 has a concave mold surface 11 corresponding to the outer surface shape of the polishing tool 1 having the working surface 3 and the gripping portion 4 . That is, the mold surface 11 of the mold 10 has a gripping portion corresponding curved surface 14 corresponding to the gripping portion 4 .

Specifically, in the forming step 1001 , the glass grains 100 are supplied from a predetermined container 20 to the mold frame 10 , and the glass grains 100 are supplied to the mold frame 10 by, for example, vibrating the mold frame 10 to which the glass grains 100 are supplied. By homogenizing the glass grains 100 by flattening the upper surfaces of the glass grains 100 and removing the excess space between the glass grains 100, the outer surface side of the glass grains 100 is formed according to the shape of the concave mold surface 11. , the shape of the outer surface of the abrasive tool 1 with the working surface 3 and the gripping portion 4 .

The glass grains 100 supplied in the forming step 1001 are made of, for example, soda glass, feldspar, or borosilicate glass. 90% by volume or more of the glass grains 100 are spherical or nearly spherical, that is, the sphericity is equal to or less than a predetermined threshold. Some of the glass grains 100 may not be spherical or nearly spherical. Further, 90% by volume or more of the glass particles 100 have a particle size of 50 μm or more and 150 μm or less. Some of the glass grains 100 may have a particle size outside the range of 50 μm or more and 150 μm or less. It should be noted that there are known techniques such as geometric diameter and equivalent diameter for expressing the particle size of the glass grain 100 . Geometric diameters include Feret diameter, unidirectional maximum diameter (i.e., Krummbein diameter), Martin diameter, sieve diameter, etc. Equivalent diameters include projected area circle equivalent diameter (i.e., Heywood diameter) Equivalent surface area sphere equivalent diameter, equivalent volume sphere equivalent diameter, Stokes diameter, light scattering diameter, etc.

When the glass grains that are not spherical or nearly spherical are included in a certain volume (10% by volume) or more, the glass grains that deviate greatly from the spherical shape cause air bubbles to form in the distorted gaps between the glass grains. As a result of the formation of such pores, it may become difficult to form pores of appropriate size and appropriate distribution inside the tool body by subsequent heating and firing. In addition, when glass grains having a particle size of more than 150 μm are contained in a certain volume (10% by volume) or more, the large glass grains form air bubbles in large gaps between the glass grains. Due to subsequent heating and baking, adjacent pores inside the tool body may connect with each other, making it difficult to form pores of appropriate size and moderate distribution inside the tool body. In this way, if the post-heating and firing does not form pores of a suitable size and a suitable distribution inside the tool body, the finally produced abrasive tool will not be able to produce sufficient results when polishing the object to be polished. It may become difficult to retain the lubricating liquid to be used appropriately, or conversely, the lubricating liquid may permeate too much into the tool body and the necessary amount of lubricating liquid may not remain on the surface. In addition, if the glass grains with a particle size of less than 50 μm are included in a certain volume (10% by volume) or more, it becomes difficult to handle the glass grains in the molding step, etc., and the glass grains are not properly placed in the mold. It may become difficult to fit.

In the firing step 1002, as shown in FIG. 5, after the molding step 1001, the glass grains 100 are heated to a temperature above the softening point of the glass grains 100 and below the melting point, so that air bubbles are dispersed and remain in the gaps between the glass grains 100. In this step, the heating is terminated in this state, and a glass block to be the polishing tool 1 is formed. In the firing step 1002 , first, the lid 12 is closed above the glass grains 100 supplied in the molding step 1001 of the mold 10 , and then the glass grains 100 are put into the heating furnace 30 together with the mold 10 and the lid 12 . . Here, the lid body 12 is made of a material having properties similar to those of the formwork 10 described above, for example, the same material as that of the formwork 10 .

In the firing step 1002, after the glass grains 100 are put into the heating furnace 30 together with the mold 10 and the lid 12, the glass grains 100 are molded by the heating furnace 30 at a temperature exceeding the softening point of the glass grains 100 and less than the melting point. The frame 10 and lid 12 are heated together for a predetermined period of time to bake. Here, the softening point of the glass grain 100 is the temperature at which the glass grain 100 begins to deform when the temperature is increased. The softening point of the glass grain 100 varies depending on the properties such as the material and structure of the glass grain 100, and is lower than the melting point. In the firing step 1002, the heating and firing soften the glass grains 100 and bring them into contact with the adjacent glass grains 100, thereby partially connecting the adjacent glass grains 100 and integrating them as a whole, forming a mold. A glass block of the tool body 2 having the working surface 3 and the gripping portion 4 is formed in a shape corresponding to the shape of the concave mold surface 11 of the frame 10 .

In the firing step 1002, the heating and firing also caused the spaces between the glass grains 100 to be appropriately separated by the glass grains 100 connected to each other, so that the glass grains 100 were appropriately sized and dispersed inside the tool body 2. Pores are formed, and as a result, the porosity of the glass block of the tool body 2 is 2% or more and 8% or less. In the firing step 1002, no abrasive grains are intentionally supplied or added to the mold 10 in the forming step 1001, and only the glass grains 100 supplied in the forming step 1001 are heated and fired. The glass block of the tool body 2 does not contain abrasive grains.

Specifically, in the baking step 1002, when the material of the glass grains 100 is soda glass, the glass grains 100 are heated at a temperature higher than 720°C and lower than 1000°C. When the glass grain 100 is feldspar, the glass grain 100 is heated at a temperature higher than 900°C and lower than 1350°C. Furthermore, when the glass grains 100 are borosilicate glass, the glass grains 100 are heated at a temperature higher than 820°C and lower than 1250°C.

When the glass particles are heated at a temperature below the softening point, the glass particles are not sufficiently deformed, and it is difficult to connect and integrate the glass particles, which may make it difficult to form the glass block of the tool body. When the glass particles are heated at a temperature equal to or higher than the melting point, the spaces between the glass particles are filled with the melted glass particles, which may make it difficult to form appropriately dispersed pores of appropriate sizes.

The predetermined time for heating the glass grains 100 by the heating furnace 30 in the baking step 1002 is, for example, one hour or more and two hours or less in this embodiment. If the heating time of the glass grains is too short, the glass grains are not sufficiently deformed and it is difficult to connect and integrate the glass grains, which may make it difficult to form the glass block of the tool body. In addition, if the glass grains are heated for too long, the glass grains are deformed too much, and the space between the glass grains is filled with the excessively deformed glass grains. There is a possibility that it may become difficult to form the pores that are formed.

In the baking step 1002, the porosity of the glass block of the tool body 2 is determined based on the particle size of the glass grains 100, the heating temperature, and the heating time. For this reason, in the firing step 1002, by strictly controlling the particle size of the glass grains 100 supplied in the forming step 1001, the heating temperature in the firing step 1002, and the heating time in the firing step 1002, the conventional natural It is possible to reduce the variation in the porosity of the glass block of the tool body 2 with respect to the Arkansas grindstone.

In the firing step 1002, after the glass grains 100 are heated and fired, the glass grains 100 are taken out together with the mold 10 and the lid 12 from the heating furnace 30, the lid 12 is opened, and the glass grains 100 are fired from the mold 10. The glass block of the tool body 2 is taken out. In this embodiment, the formwork 10 is configured to be assembled and disassembled, and by disassembling the formwork 10, the glass block of the tool body 2 formed in the firing step 1002 is taken out. Without limitation, the mold 10 may be broken to remove the glass block of the tool body 2 formed in the firing step 1002 .

The glass block of the tool body 2 taken out here has a shape corresponding to the shape of the concave mold surface 11 of the mold 10, that is, the working surface 3 and the gripping portion 4 are formed, and the internal It has a porosity of 2% or more and 8% or less and does not contain abrasive grains. Here, the removed glass block of the tool body 2 has one working surface 3 formed according to the bottom surface of the concave mold surface 11 of the mold 10 and the other working surface 3 flattened in the forming step 1001 . It is formed based on the upper surfaces of the glass grains 100 that have been ground, and can be used as the polishing tool 1 by performing a polishing step 1003 to be described later to properly polish the pair of working surfaces 3 to make them flat and parallel to each other. become something.

In the polishing step 1003, as shown in FIGS. 6 and 7, after the baking step 1002 is performed, the working surface 3 to be polished in contact with the object to be polished is polished so that the surface roughness (Ra) is 0.2 μm or more, 1 μm or more. This is the step of obtaining the polishing tool 1 according to the embodiment by making the thickness 0.5 μm or less. Specifically, in the polishing step 1003, first, the side surface including the grip portion 4 of the glass block of the tool body 2 taken out after the firing step 1002 is performed is held by the carrier 41 having the same thickness as or slightly thinner than the glass block of the tool body 2. By doing so, the glass block of the tool body 2 is held with the pair of working surfaces 3 exposed. In the polishing step 1003 , since the glass block of the tool body 2 has the gripping portion 4 as described above, the glass block of the tool body 2 can be stably held easily by the carrier 41 .

In the polishing step 1003, a disk-shaped lapping plate 42 having a large surface that sufficiently covers the working surface 3 of the glass block of the tool body 2 is provided with a lapping plate 44 having a whetstone 43 laid on one surface thereof. A set of two lap polishing discs 44 is prepared, and a pair of lapping discs 44 are rotated in opposite directions about the axis with the side where the grindstone 43 is fixed facing each other and in contact with each other, thereby grinding the grindstones 43 together. , so-called parallelization of the polished surfaces of the lapping disk 44 is carried out so that the surfaces polished by the grindstone 43 are parallel to each other.

In the polishing step 1003, as shown in FIGS. 6 and 7, the carrier 41 holding the glass block of the tool body 2 is placed between two lapping discs 44 whose polished surfaces are parallelized. Then, by rotating the two lapping discs 44 in opposite directions to each other around the axis, the pair of working surfaces 3 of the glass block of the tool body 2 held by the carrier 41 are each lapped by the two lapping discs. By polishing with the grindstone 43 of the polishing surface 44, the pair of working surfaces 3 of the glass blocks of the tool body 2 can be made flat and parallel to each other, and undulations of the glass blocks of the tool body 2 can be removed. In the polishing step 1003, the pair of working surfaces 3 of the glass block of the tool body 2 formed by carrying out the molding step 1001 and the firing step 1002 are thus polished to obtain the embodiment as shown in FIG. A polishing tool 1 is obtained.

In the polishing step 1003, in the example shown in FIG. 6, four carriers 41 holding glass blocks of three tool bodies 2 are arranged between a set of lapping discs 44, and the tool bodies 2 are polished at one time. Although 12 glass blocks are polished, the present invention is not limited to this, and may be polished one by one or may be polished more at once.

The surface roughness (Ra) of the pair of working surfaces 3 after polishing in the polishing step 1003 is determined by the whetstone size of the whetstones 43 of the polishing surfaces of the two lapping discs 44 for polishing the pair of working surfaces 3 . For this reason, in the polishing step 1003, the grindstone 43 having a grindstone size such that the surface roughness (Ra) of the pair of working surfaces 3 after polishing is 0.2 μm or more and 1.5 μm or less is used. Here, the grindstone size of the grindstone 43 is the size of the grain size of the grindstone 43, and is defined by the JIS standard "R6001: Grain size of abrasive material for grinding wheels", and the larger the center grain size, the smaller the number. This is a parameter whose number increases as the center particle size decreases. Specifically, the grindstone size of the grindstone 43 used in the polishing step 1003 is, for example, #360 (360) or more and #2500 (2500) or less. In the polishing step 1003, by strictly controlling the grindstone size of the grindstone 43, variations in the surface roughness (Ra) of the working surface 3 can be reduced as compared with the conventional natural Arkansas grindstone.

In the polishing step 1003, in this embodiment, the pair of working surfaces 3 of the glass blocks of the tool body 2 are polished by the two lapping discs 44, but the present invention is not limited to this, and the glass blocks are polished. Anything possible may be used to polish.

The polishing tool 1 according to the embodiment having the configuration described above is formed of a glass block like the Arkansas grindstone, and the surface roughness (Ra) of the working surface 3 is 0.2 μm or more and 1.5 μm or less. Therefore, it is possible to polish the surfaces of metals and ceramics, which are objects to be polished, with the same quality and work feeling of the operator as when using the Arkansas grindstone. In addition, since the polishing tool 1 according to the embodiment has a pair of working surfaces 3 that are flat and parallel to each other, it is necessary for conventional Arkansas whetstones, which are natural products and are supplied to the market as they are cut. This provides the advantage of omitting the work of forming a working surface by polishing again after purchase and before use.

In addition, since the porosity of the polishing tool 1 according to the embodiment is 2% or more and 8% or less, the lubricating liquid can be retained in an appropriate amount, and a necessary amount of the lubricating liquid can be supplied without excessive penetration of the lubricating liquid. It is possible to polish the object to be polished while remaining on the working surface 3 and easily acting thereon.

In addition, since the polishing tool 1 according to the embodiment does not contain abrasive grains, the flatness of the working surface 3 is extremely high. It has the effect of being able to suppress the risk of occurrence on the surface.

Conventional Arkansas grindstones are used with lubricating liquid, so there is a risk that the operator's hand may slip and the wheel may fall and be damaged. However, since the gripping portion 4 is formed in the polishing tool 1 according to the embodiment, the operator can grip the polishing tool 1 more firmly, and by gripping the polishing tool 1 firmly, the polishing tool 1 can be dropped. It is possible to greatly reduce the risk of breakage, and it is possible to stably polish the object to be polished on the working surface 3 with an appropriate pressure.

Further, in the method for manufacturing a polishing tool according to the embodiment having the above configuration, the glass block of the polishing tool 1 is formed by heating and baking the glass grains 100 to integrate them. It is possible to artificially obtain the polishing tool 1 having the components of In addition, in the method for manufacturing a polishing tool according to the embodiment, in the polishing step 1003, the polishing tool 1 is polished with a whetstone 43 having a whetstone size such that the working surface 3 has a surface roughness (Ra) of 0.2 μm or more and 1.5 μm or less. Since the working surface 3 is polished, it is possible to artificially obtain a polishing tool 1 having a surface roughness similar to that of the Arkansas grindstone. In addition, in the polishing step 1003 of the method for manufacturing a polishing tool according to the embodiment, the pair of working surfaces 3 are formed flat and parallel to each other. It is possible to artificially obtain the polishing tool 1 that can omit the work of forming the working surface by polishing again after purchase and before use. In addition, in the method for manufacturing a polishing tool according to the embodiment, since the working surface 3 is polished while controlling the size of the whetstone 43 used in the polishing step 1003, the variation in surface roughness (Ra) is reduced to that of the conventional natural one. It is possible to artificially obtain a polishing tool 1 that is less than the Arkansas grindstone.

Further, in the method for manufacturing a polishing tool according to the embodiment, the particle size of the glass grains 100 supplied in the forming step 1001, the heating temperature in the firing step 1002, and Since the glass grains 100 are heated and fired by controlling the heating time in the firing step 1002, the porosity is similar to that of the Arkansas grindstone, and the variation in porosity is greater than that of the conventional natural Arkansas grindstone. It is possible to artificially obtain a polishing tool 1 with a small amount.

In addition, in the method for manufacturing a polishing tool according to the embodiment, only the glass grains 100 are heated and fired without intentionally supplying or adding abrasive grains to form the glass block of the tool body 2 which is the base of the polishing tool 1. Since the polishing tool 1 does not contain abrasive grains, the flatness of the working surface 3 is extremely high, and it is possible to suppress the risk of damage such as scratches occurring on the surface to be polished even when polishing an object to be polished such as metals and ceramics. can be obtained artificially.

Since the conventional Arkansas grindstone is difficult to process, it has been difficult to form the grip portion 4 of the polishing tool 1 according to the embodiment. However, in the manufacturing method of the polishing tool according to the embodiment, in the forming step 1001, the mold 10 in which the shape of the gripping portion 4 is set, that is, the concave mold surface 11 having the gripping portion corresponding curved surface 14 corresponding to the gripping portion 4 is formed. The glass grains 100 are supplied to the mold 10 in which is formed and formed into a desired shape, and then the glass grains 100 are heated and fired in the firing step 1002, so that the operator can grip the polishing tool 1 more firmly. Firmly gripping the polishing tool 1 can greatly reduce the risk of the polishing tool 1 dropping and being damaged, and the working surface 3 can polish the object to be polished stably with an appropriate pressure. It is possible to artificially obtain the polishing tool 1 having the grip portion 4 formed thereon.

[Modification]
A method for manufacturing a polishing tool and a polishing tool 1-2 according to a modification of the present invention will be described with reference to the drawings. FIG. 8 is a perspective view showing a polishing tool 1-2, which is an example of a polishing tool according to a modification. In FIG. 8, the same reference numerals are given to the same parts as in the first embodiment, and the description thereof is omitted.

As shown in FIG. 8, a polishing tool 1-2 according to a modification is obtained by changing the gripping portion 4 in the polishing tool 1 according to the embodiment to a gripping portion 4-2, and other configurations are the same as those of the embodiment. It is the same. The gripping portion 4-2 of the modified example is obtained by changing the shape of the gripping portion 4 of the embodiment. Specifically, as shown in FIG. 1, the gripping portion 4 of the embodiment extends in a direction orthogonal to the action surface 3 and is formed with the number of fingers (five locations), while the gripping portion 4 of the modified example As shown in FIG. 8, -2 extends in the longitudinal direction of the working surface 3 and is formed on each of the pair of side surfaces. As shown in FIG. 8, the curved surface of the grip portion 4-2 is formed into a concave curved surface corresponding to the convex curved surface along the direction in which the operator's finger extends from the tip of the finger to the third joint. By gripping the grip part 4-2 with these parts of the operator's hand, the convex curved surface of these parts of the operator's hand and the concave curved surface are brought into contact with each other so that the polishing tool 1- 2 can be gripped more firmly to allow the working surface 3 to polish the object to be polished stably with an appropriate pressure.

Next, this specification describes the operation of the manufacturing method of the abrasive tool according to the modification. A method for manufacturing a polishing tool according to a modification is a method for manufacturing a polishing tool 1-2 according to a modification shown in FIG. 3 and a gripping portion 4-2, which corresponds to the outer shape of the polishing tool 1-2. and other configurations are the same as in the embodiment.

The polishing tool 1-2 according to the modified example having the configuration as described above is the polishing tool 1 according to the embodiment, in which the gripping portion 4 is changed to a gripping portion 4-2 having a different shape. Since it is the same as the embodiment, it has the same effect as the embodiment. Further, the manufacturing method of the polishing tool according to the modified example is the manufacturing method of the polishing tool according to the embodiment, in which the mold 10 to be used corresponds to the outer surface shape of the polishing tool 1-2 having the grip portion 4-2. , and other configurations are the same as those of the embodiment, so that the same effects as those of the embodiment can be obtained.

It should be noted that the present invention is not limited to the above embodiments. That is, various modifications can be made without departing from the gist of the present invention. In the above-described embodiment and modification, the polishing tool 1 is manufactured by supplying the glass grains 100 to the mold 10 and heating and firing the mold 10 together. The abrasive tool 1 may be manufactured by heating and firing after the grains 100 are supplied to the mold 10 and then compression-molded and released from the mold. Abrasive tool 1 may be produced by pouring a mixture of slurries into a mold 10 and drying to form a so-called cast molding, followed by release from the mold, followed by heating and firing.

Reference Signs List 1, 1-2 polishing tool 2 tool body 3 working surface 4, 4-2 gripping portion 10 mold 11 mold surface 100 glass grain

Claims (5)

A method of manufacturing an abrasive tool, comprising:
A molding step of supplying glass grains to a mold having a shape of a gripping portion and molding it into a desired shape;
After the molding step, the glass grains are heated at a temperature exceeding the softening point of the glass grains and less than the melting point, and the heating is completed in a state in which air bubbles remain dispersed in the gaps between the glass grains, resulting in a polishing tool. and a firing step of forming a glass block. 2. The method of manufacturing a polishing tool according to claim 1, wherein the glass block after the firing step has a porosity of 2% or more and 8% or less. 3. The method according to claim 1 or 2, further comprising a polishing step of polishing the working surface to be polished in contact with the object to be polished after performing the baking step so that the surface roughness (Ra) is 0.2 μm or more and 1.5 μm or less. A method for manufacturing an abrasive tool. A polishing tool for polishing metal or ceramic surfaces,
A polishing tool comprising a glass block having a surface roughness (Ra) of 0.2 μm or more and 1.5 μm or less, a porosity of 2% or more and 8% or less, and having a grip portion formed thereon. 5. The polishing tool according to claim 4, characterized in that it does not contain abrasive grains.

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