JP2000117641A - Manufacture of grinding wheel, and grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a grinding wheel by the manufacturing device of an easy structure at a low cost. SOLUTION: A slurry made of a mixture containing abrasive grains, a bond material, an organic binder and solvents is coated on the surface of a base material in a sheet shape and, by gasifying the solvents contained in the slurry, a sheet material 30a is formed. By winding this sheet material 30a on the outer peripheral surface of a core material, a cylindrical sheet laminate body 30b having a specified outer diameter is formed. By machining this, a cylindrical, disk-shaped or cup-shaped sheet laminate body is formed and, by heating and sintering this sheet laminate body 30b, a grinding wheel is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a grinding wheel and a grinding wheel.

[0002]

2. Description of the Related Art Grinding is a processing method that uses a grinding wheel, that is, a grinding wheel, to give a rotating motion to the surface of the workpiece with the abrasive grains of the grinding wheel, smooth the surface, and precisely finish the surface. There are grinding methods such as cylindrical grinding, internal grinding, surface grinding and special grinding.

[0003] Cylindrical grinding is a method in which the outer peripheral surface of a grinding wheel is used as a grinding surface to process a workpiece, that is, the outer peripheral surface of a work. In internal grinding, the outer peripheral surface of the grinding wheel is used as a grinding surface for a cylindrical or similar workpiece. This is a method of processing the inner peripheral surface, and the surface grinding is a method of processing the plane of the workpiece using the outer peripheral surface or the end surface of the grinding wheel as a grinding surface. The shape of the grinding wheel is generally cylindrical, cup-shaped or disk-shaped.When grinding gears and screws, the outer periphery of the disk-shaped grinding wheel corresponds to the cross-sectional shape of the tooth and screw grooves. A specially shaped grinding wheel is used.

[0004] The grindstone used in these various grinding processes is formed by bonding abrasive grains with a bonding material, that is, a bonding material, and solidifying it in a predetermined shape.
Consists of elements.

As a method of manufacturing a grinding wheel, there are a press forming method using a mold and a pouring method in which a grindstone raw material is poured into a mold. The press molding method is a method in which a mixed powder of abrasive grains and a binder is filled in a mold, solidified by a press, and then heated to produce a grindstone.The pouring method uses a liquid binder to provide fluidity. This is a method in which the raw material of the grinding stone is poured into a mold to form a predetermined shape, and then heated to manufacture.

[0006]

In the press molding method, the grindstone raw material filled in the mold is pressed by the press mold, so that the portion close to the mold and the inside of the grindstone are not pressed. In such a case, the pressing force of the press is different, the density distribution of the entire grindstone is different, and the distribution density of the abrasive grains may be different. In the casting method,
If there is a difference in specific gravity between the abrasive grains and the binder, the abrasive grains and the binder are separated in the mold after pouring, resulting in a difference in the density distribution of the entire grindstone and a difference in the distribution density of the abrasive grains. Sometimes. In addition, all of these manufacturing methods require complicated manufacturing equipment, and increase the manufacturing cost of the grindstone.

Grinding is a process in which the outer peripheral surface or end surface of a grindstone is used as a grinding surface, and the surface of a workpiece is cut as a large number of chips by cutting edges of a large number of abrasive grains on the surface of the grinding surface. When the abrasive grains in the portion fall off, the ground surface becomes clogged or blinded. In that case, a new cutting edge is created on the surface of the ground surface by removing the ground surface thinly by dressing.

[0008] Therefore, by repeating the grinding and the dressing, the inner portion of the grindstone is gradually exposed to the outer surface, so that the distribution density of the abrasive grains is uniform throughout the grindstone. This is necessary in order to continuously perform grinding with one grindstone with the same machining accuracy.

On the other hand, if the grinding time from the start of grinding with the grindstone to the time of dressing can be maintained for a long time, the number of times of dressing can be reduced, thereby improving the grinding efficiency. It becomes possible. Also, if the grinding surface can be made less likely to cause clogging and blinding, the time for processing a desired amount of grinding can be reduced without increasing the pressing force on the workpiece by the grindstone. The grinding efficiency can be improved. In addition, if desired processing can be performed even if the pressing force is reduced, deformation of the workpiece can be prevented, and processing accuracy can be increased.

An object of the present invention is to make it possible to easily manufacture a grindstone at a low cost by using a manufacturing facility having a simple structure.

Another object of the present invention is to improve the grindability of a grindstone.

Another object of the present invention is to improve the precision of grinding a workpiece.

[0013]

A method of manufacturing a grinding wheel according to the present invention comprises the steps of forming a plastically deformable sheet material having abrasive grains, a bonding material, and an organic binder; The method includes a step of forming a cylindrical sheet laminate having a predetermined outer diameter by winding the sheet laminate around an outer peripheral surface, and a step of heating and sintering the sheet laminate.

The method for manufacturing a grinding wheel according to the present invention comprises the steps of forming a plastically deformable sheet material having abrasive grains, a bonding material, and an organic binder, and winding the sheet material around an outer peripheral surface of a core material. Forming a cylindrical sheet laminate having an outer diameter of, forming a plurality of recesses on the surface of the sheet laminate, and heating and sintering the sheet laminate. Features.

The method for manufacturing a grinding wheel according to the present invention includes a step of forming a sheet material having abrasive grains, a bonding material, and an organic binder; a step of stacking a plurality of the sheet materials to form a sheet laminate; The method includes a step of cutting the sheet laminate into a shape corresponding to a grindstone, and a step of heating and sintering the sheet laminate.

The step of forming the sheet material includes a step of applying a slurry composed of a mixture of abrasive grains, a bonding material, an organic binder, and a solvent to the surface of the substrate in a sheet form, and a step of vaporizing the solvent contained in the slurry. And forming the sheet material having a thickness of 1 mm or less.

The grinding wheel of the present invention has a grinding wheel holder having a mounting surface provided on an end surface or an outer peripheral surface, and a plurality of tubular grinding stone pieces protruding from the mounting surface and mounted on the grinding wheel holder. A grinding edge is formed at the boundary between the inner peripheral surface and the outer peripheral surface of the grinding wheel piece and the distal end surface, and the grinding edges are dispersed and arranged in a grinding surface formed by the distal end surfaces of the plurality of tubular grinding stone pieces. It is characterized by the following. The tubular grinding stone piece may be manufactured by the manufacturing method.

The grinding wheel of the present invention has a plurality of recesses which are opened on the grinding surface in a grinding wheel body having a grinding surface on an end surface or an outer peripheral surface, and is formed at a boundary between the inner peripheral surface of the recess and the grinding surface. A grinding edge is formed, and the grinding edge is dispersedly arranged on the grinding surface of the whetstone main body. The grinding wheel main body may be manufactured by the above manufacturing method.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing the external shape of a grinding wheel, that is, a grinding wheel. The grinding wheel 1 shown in FIG. 1A has a cylindrical shape, and its outer peripheral surface 2 is a grinding surface. The grindstone 1 is rotated by a drive shaft attached to a through hole at the center to grind a cylindrical outer peripheral surface of the workpiece or an inner peripheral surface of the cylindrical workpiece. be able to.

FIG. 1B is a view showing a disk-shaped grinding wheel 1. When the outer peripheral surface 2 of the grinding wheel 1 is used as a grinding surface, cylindrical grinding or surface grinding can be performed. When a ground surface is used, surface grinding can be performed. FIG. 2C is a view showing the cup-shaped grindstone 1, which is formed by attaching a ring-shaped grindstone portion 7 to a metal cup body 6, and the end surface 3 of the grindstone portion 7 serves as a grinding surface. And can perform surface grinding.

When special grinding such as gear grinding or screw grinding is performed, the outer peripheral surface of the grindstone 1 shown in FIGS. 1A and 1B corresponds to the groove shape of the gear or screw. A grindstone formed in a predetermined shape is used. The shape of the grindstone shown in FIG. 1 is a basic shape, for example, Japanese Industrial Standard (JI
There are grinding wheels of various shapes as specified in R) 6211 of S). In addition, as a grinding wheel mainly having an abrasive layer on the periphery or end surface of a metal base metal, there are a diamond and a CBN wheel specified in JIS B 4131.

The grinding wheel shown in FIG. 2 has a metal grinding wheel holder 10 and a plurality of cylindrical tubular grinding wheel pieces 1.
1, the grinding wheel holder 10 has a disk shape having an outer peripheral surface 12 and an end surface 13, and is rotatably driven by a shaft portion 12a provided thereon. The end surface 13 of the grindstone holder 10 is a mounting surface, and a plurality of tubular grindstone pieces 11 are mounted on the mounting surface.

Each of the tubular grindstone pieces 11 has a tubular or cylindrical shape having a smaller diameter than the grindstone holder 10 as shown, has an inner peripheral surface and an outer peripheral surface, and has an inner peripheral surface and a distal end surface. An edge 14 is formed at an edge or a corner which is a boundary of the edge, and an edge 15 is formed at an edge or a corner which is a boundary between the outer peripheral surface and the front end surface.
Numeral 15 is a grinding edge. The tip surface of each tubular grindstone piece 11 forms a ground surface that is entirely flat, and the grinding edges 14 and 15 are dispersed in the ground surface.

As described above, by dispersing and arranging the grinding edges in the grinding surface, when the flat surface of the workpiece is ground by using this grinding wheel, a plurality of grinding edges are formed on the workpiece. Will come into contact at the same time. When the grinding process is performed, not only the grinding edge portion but also the portion other than the grinding edge comes into contact with the workpiece, and a large number of abrasive cutting edges of the surface layer constituting the grinding surface are coated. Although it will come into contact with the workpiece at the same time, it has been found that the portion of the grinding edge that contributes greatly to the grinding process of cutting the surface of the workpiece by the cutting edge of the abrasive grain is more than the portion other than the grinding edge .

The end face 3 of the grindstone 1 shown in FIG. 1B has an edge 4 on the inner peripheral surface and an edge 5 on the outer peripheral surface. It was found that the edges 4 and 5 were worn down at the forefront, and the ground surface was clogged. As shown in FIG. 2, by arranging and forming the grinding edges 14 and 15 in the grinding surface in a dispersed manner, the edge grinding is performed over a wide range of the grinding surface.

According to the experiment, when the grinding wheel shown in FIG. 2 was used for grinding, the end surface 3 of the disk-shaped grinding wheel 1 shown in FIG. Thus, a desired amount of grinding could be processed in a short time with a small pressing force against the workpiece. In addition, since the pressing force can be reduced, the grinding accuracy can be increased, and the amount of grinding before the clogging or blinding of the ground surface occurs can be improved, thereby improving the grinding efficiency. It became possible.

In the grinding wheel shown in FIG. 2, the tubular grinding wheel piece 11 is attached to the entire end face 13 of the grinding wheel holder 10, but the tubular grinding wheel piece 11 may not be attached to the central portion. Alternatively, the tubular grindstone pieces 11 may be attached to the outer peripheral portion of the end face 13 in one or two rows. In addition, in the grinding wheel shown in FIG.
The tubular grindstone piece 11 may be attached to the outer peripheral surface 12 as an attachment surface. In that case, the tip surfaces of the plurality of tubular grindstone pieces 11 form an overall cylindrical grinding surface, which can be used as a grinding surface to perform surface grinding or cylindrical grinding.

The grindstone 21 shown in FIG. 3 has the same basic shape as the grindstone 1 shown in FIG. 1 (A), has a cylindrical shape, and the outer peripheral surface 22 of the grindstone 21 is a ground surface. This whetstone 2
A plurality of recesses 23 are formed in 1, and an edge or a corner which is a boundary between the inner peripheral surface 24 and the grinding surface, that is, the outer peripheral surface 22 of each of the recesses 23 is a grinding edge 25. By forming the respective concave portions 23 separately from each other and forming them on the grinding surface of the grinding wheel 21, the grinding edges 25 are dispersedly arranged on the outer peripheral surface 22 of the cylindrical grinding wheel 21.

In this manner, the grinding edge 2 is provided in the grinding surface.
5 are arranged in a dispersed manner, and when the workpiece is cylindrically ground or surface ground using this grindstone 21,
The grinding edge comes into contact with the workpiece along with portions other than the grinding edge. Then, similarly to the grindstone shown in FIG. 2, when the grinding is performed, the grinding edge greatly contributes to the grinding for shaving the surface of the workpiece, and the grindstone shown in FIG. Also, a desired amount of grinding can be processed in a short time with a small pressing force against the workpiece, and the pressing force can be reduced, so that the grinding accuracy can be improved. In addition, it is possible to improve the amount of grinding before the occurrence of clogging or blinding of the grinding surface, thereby improving the grinding efficiency.

In the grinding wheel shown in FIG. 3, the outer peripheral surface 22 is a grinding surface. As shown in FIG. 1B, the grinding wheel has a disk shape and its end surface is a grinding surface. May be formed. In this case, the end surface on which the grinding edges are dispersed is the ground surface, and the workpiece can be ground.

FIG. 4 is a flowchart showing a basic manufacturing process of a grinding wheel, which includes a sheet material forming step, a sheet laminated body forming step, and a sintering step.

FIG. 5 is a view showing an example of a method of forming a sheet material. First, abrasive particles and a binder, that is, a bonding material, an organic binder, and a solvent are supplied into a container (not shown), and a mixture of these is formed. A suspension or slurry 30 is produced.
After the slurry 30 is sufficiently mixed in a container, it is supplied into a discharge nozzle 31 shown in FIG.
1 to a band-shaped film substrate 32. As shown by the arrow, the film substrate 32 is conveyed by being taken up from a supply reel 33 to a take-up reel 35 via a guide roller 34, and is applied to the upper surface of the film substrate 32 and Slurry 30 adhered to
Is transported by the film base material 32 to have a certain thickness on the film base material 32 to form a sheet.

As the material for the abrasive grains, alumina, silicon carbide, diamond, cubic boron nitride (CBN), and the like are used. As the grain size of the abrasive grains, coarse powder of No. 8 to No. 220 specified in JIS R6001 may be used, or fine powder of No. 240 to No. 8000 may be used. Any particle size can be used.
As a bonding material, that is, a bonding material, a metal bond, a resinoid bond, a vitrify bond, or the like can be used.

An organic binder and a solvent are added to the slurry 30 in addition to the abrasive grains and the bonding material described above. The solvent is applied to the slurry on the film substrate 32 to form a sheet having a predetermined thickness and then dried and vaporized, whereby the slurry 30 having fluidity becomes a sheet having a predetermined shape retention property. Material 30a.

The organic binder has a function of disappearing during sintering and forming a predetermined porosity in the grindstone after sintering, and various substances can be used as long as they disappear during sintering. . For example, when polyvinyl chloride (PVC), polyvinyl butyral (PVB), polyvinylidene chloride (PVDC), or the like is used, the sheet material 30a can have a predetermined plasticity so that the sheet material 30a can be plastically deformed. . When a phenol resin, a polyester resin, an epoxy resin, or the like is used, the sheet material 30a has a relatively high strength and is not easily deformed. These resin materials as the organic binder are in a state of being dissolved by the solvent added when the slurry 30 is manufactured.

The thickness D of the sheet material 30a can be set to an arbitrary thickness by adjusting the distance between the film substrate 32 and the discharge nozzle 31, the transport speed of the film substrate 32, and the like. When the thickness is D, handling is easy. In particular, when the thickness is 500 μm or less, for example, about 20 to 30 μm, handling becomes easier.

When the thickness D is set as described above, a slurry having fluidity when discharged from the discharge nozzle 31 is formed. The sheet material 30a having a shape retaining property in about a minute is obtained. By separating the sheet material 30a from the film substrate 32 as shown in FIG.

In the case shown in FIG. 5, the film base 32 is conveyed and the discharge nozzles 31 are fixed. However, if the film base 32 and the discharge nozzles 31 are relatively moved,
The film base 32 may be fixed, and the discharge nozzle 31 may be transported. In this case, a plate material or a block material having a flat surface can be used as the base material without using a film-shaped base material.

FIG. 6 is a view showing a step of forming a sheet laminate provided downstream of the step of forming the sheet material shown in FIG. 5, and the sheet material 30a is wound around the outer peripheral surface of the tubular core material 36. Thus, a cylindrical sheet laminate 30b is formed.

As shown in FIG. 6, when a cylindrical sheet laminate 30b is formed by a winding operation, it is preferable that the sheet material 30a be plastically deformable. In the case of manufacturing, an organic binder that gives the sheet material 30a plasticity, such as the above-described PVB, is used.

At the time of winding, since the surface of the sheet material 30a has adhesiveness, a cylindrical sheet laminate 30b is easily formed by performing the winding operation. When forming the sheet laminate 30b, the core material 36 may be rotated to wind the sheet material 30a, or the core material 36 may be fixed and the sheet material 30a may be moved and wound.

With the sheet laminate 30b having such a shape, the cylindrical grindstone shown in FIG.
As shown in the figure, a cup-shaped grinding wheel can be manufactured,
As shown by a broken line in FIG. 6, by cutting with a cutter at predetermined intervals, a disk-shaped grindstone can be manufactured as shown in FIG. 1 (B).

In order to manufacture the grindstone 21 having the concave portion 23 on the ground surface as shown in FIG. 3, a tool 37 made of a thin pipe or the like is used as shown in FIG.
As shown in FIG. 7A, when the tool 37 is separated from the sheet laminate 30b as shown in FIG. 7B after biting into the sheet laminate 30b, a part of the sheet laminate 30b enters into this, and The concave portion 23 can be easily formed by being cut off from the sheet laminate 30b.

As shown in FIG. 2, when a grindstone having a tubular grindstone piece 11 is manufactured, the tubular grindstone piece 11 is formed by using a cylindrical sheet laminate 30b as shown in FIG.
Can be manufactured. In the case of manufacturing a grindstone having the tubular grindstone pieces 11, when a plurality of sheet laminates 30b are arranged in grooves or holes formed in the grindstone holder 10 and a solvent is applied to the outer peripheral surface thereof, as shown in FIG. As described above, a tubular grindstone piece in which adjacent sheet laminates 30b are physically integrated with each other can be obtained.

FIG. 9 is a view showing another example of the sheet laminate 30b. In this case, a plurality of sheet materials 30a cut to a predetermined length are stacked to form a block-like sheet such as a cube or a rectangular parallelepiped. A body 30b is formed. By cutting the sheet laminate 30b at a portion indicated by a two-dot chain line in FIG. 9 using a pipe-like tool or a cutter similar to the tool 37, a grindstone having a cylindrical disk shape or the like can be manufactured. .

When a grindstone is manufactured using the block-shaped sheet laminate 30b, the sheet material 30a does not need to have plasticity, and a phenol resin or the like can be used as an organic binder. Further, when the block-shaped sheet laminate 30b is formed, a predetermined amount is formed on the surface of the mold material without continuously manufacturing the belt-shaped sheet material 30a using the film base material 32 as shown in FIG. By injecting the slurry 30, the sheet material 30a having a predetermined size can be manufactured.

FIG. 10 is a view showing a mold material 41 for forming a sheet material 30a of a predetermined size. The mold material 41 is used as a base material in a concave portion 42 formed on the surface corresponding to the thickness of the sheet material 30a. By applying the slurry 30,
The sheet material 30a can be manufactured.

The sheet laminate 30b formed in a predetermined shape corresponding to the shape of the grindstone is sintered in a heating furnace. In the heating furnace used for the sintering process, there is a case where the object to be heated is heated in a vacuum state and a case where the heating is performed in the presence of air. It is preferable to perform a degreasing treatment at a temperature. By the sintering process, the abrasive grains contained in the sheet laminate 30b are combined by the bond material, and the organic binder is lost, so that a grindstone having the abrasive grains, the bond material, and the pores is formed. During the sintering process, the sintering temperature is set so that the abrasive grains can be combined and the organic binder can be eliminated.

[0050]

EXAMPLES (Example 1) Grain size of 30 to 40 μm as abrasive grains
100 parts by weight of diamond abrasive grains having a diameter of 1 to 2 μm and a tungsten powder having a high rigidity of 1 to 2 μm as a bonding material.
Parts by weight, 3 parts by weight of PVB as an organic binder, and 9 parts by weight of ethyl alcohol as a solvent were weighed and poured into a container, and mixed for 24 hours using alumina balls. The slurry-like mixture having fluidity obtained in this manner is applied to the sheet material 30 by the method shown in FIG.
a was produced. The thickness of the sheet material 30a immediately after being discharged from the discharge nozzle 31 was set to 500 μm. Sheet material 3
The thickness of the dried sheet material 30a in which the solvent in 0a was evaporated was about 300 μm.

The obtained sheet material 30a is cut into a predetermined size and wound into a roll as shown in FIG. 6 to form a cylindrical sheet laminate 30b. Further, as shown in FIG. Individually formed. Then, in a heating furnace,
After heating to 00 ° C and degreased in the air, pulse current sintering was performed at 1400 ° C and 10MPa in a vacuum atmosphere.
The sintering process was performed for 5 minutes at a. As a result, a cylindrical grindstone as shown in FIG. 3 was obtained, and WC was generated at the interface between the diamond abrasive grains and the tungsten powder, and the porosity was 40%.

Example 2 100 parts by weight of diamond abrasive grains having a particle size of 2 μm as abrasive grains, 34 parts by weight of tungsten powder having a high rigidity of 0.3 μm as a bonding material, and 3 parts by weight of PVB as an organic binder. Parts by weight and 12 parts by weight of ethyl alcohol as a solvent were each weighed and poured into a container, and mixed for 24 hours using alumina balls. A sheet material 30a was manufactured from the slurry mixture having fluidity obtained in this manner by the method shown in FIG. The thickness of the sheet material 30a immediately after being discharged from the discharge nozzle 31 was set to 500 μm. Sheet material 30a
The thickness of the dried sheet material 30a after the solvent therein was vaporized was measured to be about 300 μm.

After the sheet laminate 30b having the shape shown in FIG. 7 is formed by using the sheet material 30a, the same degreasing treatment as in the first embodiment is performed, and then, a pulse current sintering method is used in a vacuum atmosphere. Sintering was performed at 1300 ° C. and 10 MPa for 5 minutes. Thus, a cylindrical grindstone having a porosity of 50% as shown in FIG. 3 was obtained.

(Example 3) Abrasive grains having a grain size of 30 to 40
100 parts by weight of 100 μm diamond abrasive grains, 120 parts by weight of titanium powder having a particle size of 2 μm as a bonding material, 10 parts by weight of PVB as an organic binder, and 60 parts by weight of ethyl alcohol as a solvent. And mixed for 24 hours using alumina balls. A sheet material 30a was manufactured from the slurry mixture having fluidity obtained in this manner by the method shown in FIG.
The thickness of the sheet material 30a immediately after being discharged from the discharge nozzle 31 was set to 500 μm. The thickness of the dried sheet material 30a after the solvent in the sheet material 30a was vaporized was measured to be about 250 μm.

After a sheet laminate 30b having the shape shown in FIG. 7 is formed using the sheet material 30a, the sheet is degreased at 400 ° C. in the air.
Time sintering was performed. As a result, a cylindrical grindstone as shown in FIG. 3 was obtained, and TiC was generated at the interface between the diamond abrasive and the titanium powder, and the porosity was 30%.

(Example 4) Abrasive grains having a grain size of 30 to 40
100 parts by weight of diamond abrasive grains of 20 μm, 20 parts by weight of vitrified bond having a particle diameter of 2 μm as a bonding material, the same organic binder as in Example 1, and a solvent were weighed and injected into a container to form a slurry. As a mixture, a cylindrical sheet laminate 30b was manufactured from the sheet material 30a formed in the same manner as in Example 1. In addition, FIG.
As shown in Table 3, three types of sheet laminates were prepared: a sheet laminate having 20 concave portions, a sheet laminate having 50 concave portions, and a sheet laminate having no concave portions. Three types of grinding wheels were manufactured by sintering at a temperature.

Each grindstone was mounted on a drive shaft to form a grindstone with a shaft, and a low-pressure grinding test was performed using a grinder. An optical glass was used as a workpiece.

FIGS. 11 and 12 show the respective grinding results. The grinding removal speed at which the workpiece is removed by increasing the peripheral speed of the grindstone or by increasing the grinding pressure, that is, FIG. The removal amount per unit time has increased. When the concave portion 23 is formed on the outer peripheral surface 22 of the grindstone 21, the cutting edge speed is higher due to the action of the grinding edge 25 even at the same grindstone peripheral speed. Speed was great.

By arranging the grinding edge on the grinding surface as described above, the grinding amount can be increased even with a small grinding pressure, and the grinding efficiency can be increased. Applying force can be prevented, and grinding accuracy can be increased. In addition, since the amount of cutting removal is increased, even when processing the same amount of grinding, it is possible to perform grinding in a short time by providing a plurality of recesses and forming a grinding edge, thereby improving grinding efficiency. It can be improved.

The present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the scope of the present invention.

For example, as the shape of the grindstone that can be manufactured by the manufacturing method of the present invention, those having various shapes defined by the above-mentioned JIS standard can be manufactured in addition to the illustrated shapes. Although the illustrated grindstones are manufactured using the same type of sheet material, a sheet laminate is formed by mixing multiple types of sheet materials with different types and particle sizes of abrasive grains and types of bond materials and particle sizes. You may do it. The type of the sheet material may be different between the central portion and the peripheral portion of the grindstone.

[0062]

According to the present invention, the grinding wheel is manufactured by using a sheet laminate formed by laminating sheet materials without using a pressing die or the like as a raw material for the grinding wheel. The grinding stone can be easily manufactured at low cost with simple equipment. By using the sheet material, the distribution density of the abrasive grains in the entire grindstone can be made uniform, and a high-quality grindstone can be manufactured. Since the shape can be processed in the state of the sheet laminate, it is possible to easily manufacture a grindstone having a concave portion on the ground surface or a grindstone having a special outer peripheral surface. By attaching a plurality of tubular grindstone pieces to the grindstone holder, the grinding edges are dispersed and arranged on the grinding surface by each piece, and a grindstone excellent in grinding performance and grinding accuracy can be obtained. A grinding wheel with excellent grinding performance and grinding accuracy by forming a recess on the grinding surface of the grinding wheel and dispersing and arranging the grinding edge formed at the boundary between the inner peripheral surface of the recess and the grinding surface on the grinding surface. Can be obtained.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a cylindrical whetstone,
(B) is a perspective view showing a disk-shaped whetstone,
(C) is sectional drawing which shows the grindstone of a cup shape.

FIG. 2 is a perspective view showing a grindstone provided with a tubular grindstone piece.

FIG. 3 is a perspective view showing a grindstone having a recess formed in a grinding surface.

FIG. 4 is a flowchart showing a manufacturing process of the grinding wheel.

5A is a perspective view showing a sheet material forming process, and FIG. 5B is a cross-sectional view of FIG.

FIG. 6 is a perspective view illustrating a step of forming a sheet laminate.

FIGS. 7A and 7B are cross-sectional views showing steps of forming a concave portion in a sheet laminate.

FIG. 8 is a perspective view showing a part of a modification of the tubular grindstone piece in the grindstone shown in FIG. 2;

FIG. 9 is a perspective view showing another forming process of the sheet laminate.

FIG. 10 is a perspective view showing another forming process of the sheet material.

FIG. 11 is a graph showing a relationship between a peripheral speed of a grindstone and a grinding removal speed.

FIG. 12 is a graph showing a relationship between a grinding pressure of a grindstone and a grinding removal speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone 2 Outer peripheral surface 3 End surface 10 Grindstone holder 11 Tubular grindstone piece 13 End surface 14, 15 Grinding edge 21 Grindstone 22 Outer peripheral surface 23 Depression 24 Inner peripheral surface 25 Grinding edge 30 Slurry 30a Sheet material 30b Sheet laminate 31 Discharge nozzle 32 Film base Lumber

Claims (8)

[Claims] 1. A step of forming a plastically deformable sheet material having abrasive grains, a bonding material, and an organic binder, and winding the sheet material around an outer peripheral surface of a core material to form a cylindrical shape having a predetermined outer diameter. A method for manufacturing a grinding wheel, comprising: a step of forming a sheet laminate; and a step of heating and sintering the sheet laminate. 2. A step of forming a plastically deformable sheet material having abrasive grains, a bonding material, and an organic binder, and winding the sheet material around an outer peripheral surface of a core material to form a cylindrical shape having a predetermined outer diameter. A method for manufacturing a grinding wheel, comprising: a step of forming a sheet laminate; a step of forming a plurality of recesses on the surface of the sheet laminate; and a step of heating and sintering the sheet laminate. . A step of forming a sheet material having abrasive grains, a bonding material, and an organic binder; a step of stacking a plurality of the sheet materials to form a sheet laminate; A method for producing a grinding wheel, comprising: a step of cutting into a shape; and a step of heating and sintering the sheet laminate. 4. The method for manufacturing a grinding wheel according to claim 1, wherein the step of forming the sheet material comprises a step of forming a mixture of abrasive grains, a bonding material, an organic binder, and a solvent. Grinding, comprising: applying a slurry to the surface of a base material in a sheet form; and evaporating a solvent contained in the slurry to form the sheet material having a thickness of 1 mm or less. Manufacturing method of whetstone. 5. A grindstone holder having a mounting surface provided on an end surface or an outer peripheral surface, and a plurality of tubular grindstone pieces protruding from the mounting surface and mounted on the grindstone holder, wherein an inner periphery of the tubular grindstone piece is provided. A grinding edge is formed at a boundary between a surface and an outer peripheral surface and a tip surface, and the grinding edges are dispersed and arranged in a grinding surface formed by the tip surfaces of the plurality of tubular grindstone pieces. And grinding wheel. 6. The grinding wheel according to claim 5, wherein the tubular grinding wheel piece manufactured by the method for manufacturing a grinding wheel according to any one of claims 1, 2, 3, and 4 is attached to the grinding wheel holder. A grinding wheel characterized by the above. 7. A grinding wheel body having a grinding surface on an end surface or an outer peripheral surface is provided with a plurality of concave portions opening to the grinding surface, and a grinding edge is formed at a boundary between the inner peripheral surface of the concave portion and the grinding surface. A grinding wheel, wherein the grinding edges are dispersedly arranged on the grinding surface of the wheel body. 8. The grinding wheel according to claim 7, wherein the concave portion is formed in the grinding wheel body manufactured by the method for manufacturing a grinding wheel according to any one of claims 1, 2, 3, and 4. A grinding wheel characterized by the above.