JP3451903B2 - Manufacturing method of thin blade whetstone - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin blade grindstone having a low manufacturing cost and a uniform structure.

[0002]

2. Description of the Related Art A metal bond grindstone is one in which abrasive grains such as diamond and CBN are dispersed in a metal binder phase. Generally, a metal binder powder and abrasive grains are uniformly mixed and Is pressed into a press die to be compacted, and then the compact is compacted to sinter.

However, in the case of manufacturing a thin bladed grindstone by such a conventional method, since the filling thickness of the mixed powder in the press die is small, the composition of the powder and the packing density are not uniform, so that the structure of the grindstone is not uniform. There is a problem that the tendency to be uniform becomes remarkable. Further, in the manufacturing method using the press die, there is a problem that the wear of the press die due to the abrasive grains in the mixed powder is severe, so that the life of the press die is short and the production cost is correspondingly increased.

Therefore, the present inventors have previously proposed a method for manufacturing a grindstone that can improve the above problems. In this manufacturing method,
First, a slurry containing a metal binder powder, abrasive grains, and a resin binder is prepared, this slurry is supplied onto a substrate, and then the slurry is spread to a constant thickness by a so-called doctor blade. Next, after the coating film of the slurry is dried and solidified and peeled from the substrate to obtain a plate body, the plate body is heated and sintered to obtain a thin blade grindstone. Since the resin binder is decomposed and removed during sintering, a metal bond grindstone having relatively many pores can be obtained.

According to such a manufacturing method, the slurry is more easily mixed uniformly than the powder, and the thickness of the slurry can be accurately regulated. Therefore, a thin blade grindstone having a uniform structure. Can be easily manufactured. Further, since it is not necessary to use a press die that consumes a lot of wear, there is an advantage that the manufacturing cost of the grindstone can be reduced.

[0006]

However, as described above, when a doctor blade is used to spread the slurry in one direction to form a coating film, the direction of the abrasive grains in the coating film is The flow of the slurry delicately aligns and the orientation of the abrasive grains occurs. Therefore, the sharpness at the both ends of the development direction of the finally obtained thin blade grindstone is slightly different from the sharpness at the both ends in the direction orthogonal to the development direction, and some directionality is generated in the sharpness of the grindstone. Was found by the experiments of the present inventors. Since such directionality affects cutting or grinding performance, it is preferable to reduce it as much as possible.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing a thin blade grindstone capable of relaxing the directionality of sharpness caused by the developing direction of a slurry.

[0008]

[0009]

[Means for Solving the Problems ] To solve the above problems
In the method for manufacturing a thin blade grindstone according to the present invention, a step of preparing a slurry in which a metal binder powder and abrasive grains are dispersed in a resin binder solution, and a coating thickness regulation while supplying the slurry onto a substrate. Spreading with a member, applying the slurry to a constant thickness, solidifying the applied slurry and then peeling from the substrate to obtain a plate,
It is characterized in that it comprises a step of laminating and sintering the obtained two or more plate bodies so that the developing directions thereof are different from each other, for example, the developing directions are orthogonal to each other.

The content of abrasive grains in the slurry is 1 to 10% by weight, the content of metal binder is 40 to 90% by weight, and the content of resin binder is 0.5 to 20% by weight. Is preferred.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. FIG. 1 shows an example of an apparatus used for obtaining a plate body, which is a grindstone material, from a grindstone raw material slurry in the method for manufacturing a thin blade grindstone according to the first embodiment of the present invention. In the figure, reference numeral 10 is a horizontally stretched endless belt, and the endless belt 10 is a pair of rolls 1.
2, 14 are driven. At a position facing the upper surface of the endless belt 10, the undercoat layer coating device 16, the undercoat layer drying device 18, and the undercoat layer drying device 18 in order from the upstream side to the downstream side in the belt traveling direction
A slurry applying device 20 and a drying device 24 are arranged.

The underlayer drying device 16 is disposed in the vicinity of the roll 12 so as to face the upper surface of the endless belt 10, and the undercoat paint 28 filled inside is continuously applied to the upper surface of the endless belt 10 from its lower end opening. Supply. As the base paint 28, for example, a resin paint such as urethane resin, epoxy resin, thermosetting polyester, heat-resistant thermoplastic resin, acrylic resin, polypropylene resin, ethylene vinyl acetate resin can be used. The side wall on the belt downstream side of the underlayer drying device 16 has a doctor blade 2
6, the base coating material having a thickness corresponding to the gap amount between the doctor blade 26 and the endless belt 10 is applied to the upper surface of the endless belt 10 as the endless belt 10 runs, and a coating film 30 is formed.

The underlayer drying device 18 is for drying the coating film 30 formed on the endless belt 10.
For example, it is configured by a warm air dryer, a far infrared ray dryer or the like. The coating film 30 is solidified by being dried by the underlayer drying device 18, and becomes a carrier tape that supports a slurry layer 36 described later. It is necessary that this carrier tape decomposes and disappears during the later-described sintering. Although the thickness of the carrier tape is not limited, it is preferably about 2 to 50 μm so that sufficient strength can be obtained and the residue can be removed without leaving any residue. If the slurry layer 36B after solidification is not too brittle, it is possible to form no carrier tape,
In that case, the underlayer coating device 16 and the underlayer drying device 18 are unnecessary.

The slurry coating device 20 is for coating the upper surface of the carrier tape formed on the endless belt 10 with the slurry 34 as a grindstone material. The slurry coating device 20 has a box-like shape having an opening at its lower end, and a downstream side wall thereof is provided with a doctor blade 32 (coating thickness regulating member). As a result, the grindstone raw material slurry 34 with which the slurry coating device 20 is filled is moved by the doctor blade 3 as the endless belt 10 travels.
2 is applied on the carrier tape to a constant thickness to form a slurry layer 36.

The doctor blade 32 of this embodiment is
As shown in FIG. 2, the first blade 32A and the second blade 32B are provided, and the gap amount from the first blade 32A to the endless belt 10 is made larger than the gap amount from the second blade 32B to the endless belt 10. ing. Any gap amount can be adjusted by adjusting means (not shown) according to the desired grindstone thickness and the viscosity of the slurry, but in general, the gap from the first blade 34A to the endless belt 10 is about 5 to 20 mm. The gap from the second blade 34B to the endless belt 10 is preferably about 0.1 to 2 mm. However, it is not limited to this range.

Thus, the two-stage blades 32A, 32
By using B, the bubbles contained in the slurry 34 can be removed to some extent in the gap between the blades 32A and 32B, and the amount of bubbles contained in the slurry layer 36 extruded from the gap between the second blades 32B is reduced. be able to. Further, even if the height of the original liquid surface of the slurry 34 varies, the coating thickness of the slurry layer 36 is less likely to be affected.

Although not shown, the slurry coating device 2
0 is preferably provided with a humidifying mechanism for preventing the surface of the slurry 34 from drying. As the humidifying mechanism of this type, a spray mechanism that continuously or intermittently sprays the same solvent as that contained in the slurry 34, such as an organic solvent or water, on the surface of the slurry 34 can be adopted. By preventing the surface of the slurry 34 from drying, it is possible to prevent air bubbles from being caught in the slurry 34 together with the solidified surface film when the slurry is applied to the slurry coating device 20.

Above the slurry coating device 20, a mixing tank 38 for supplying the slurry to the slurry coating device 20.
A kneading machine 42 having a plurality of hoppers 40 respectively containing slurry raw materials is connected to the mixing tank 38.

In the present invention, instead of the doctor blade 32, a coating roll may be used as a coating thickness regulating member. Also in this case, since the orientation of the abrasive grains occurs due to the interaction between the abrasive grains and the roll, there is an advantage in applying the present invention.

The drying device 24 heats the slurry layer 36 to volatilize the solvent so as to solidify the slurry layer 36 and the plate 36B.
Is to get. Far-infrared drying is suitable for the drying device 24 because it dries quickly, but other known heating methods such as warm air drying and heat transfer heating can be applied. However, since the slurry contains metal powder, microwave drying is not suitable in principle. The heating conditions of the slurry layer 36 by the drying device 24 are not limited, but generally the atmospheric temperature is 40 to 80 ° C., and the drying time is about 20 to 120 minutes.

The plate 36B is separated from the endless belt 10 at the position where the endless belt 10 is bent downward. A cutting device (or punching device) 46 is provided in the traveling direction of the plate body 36B, and a rectangular or disc-shaped plate body S is obtained by the cutting device 46. The plate S is composed of a thin underlayer made of resin and a porous grindstone raw material formed on the underlayer.

Next, an embodiment of a method for manufacturing a thin blade grindstone using the above apparatus will be described. First, the hopper 40 has abrasive grains,
A metal binder powder, a resin binder, a surfactant and a solvent are added and mixed in a kneader 42 to form a slurry. If the slurry is mixed, uniform mixing can be performed more easily than mixing only the powder raw materials.

The material of the abrasive grains used in the present invention is not limited, and any of superabrasive grains such as diamond grains, CBN grains and general grains such as SiC and Si ₃ N ₄ can be used. is there. Although the shape of the abrasive grains is not limited, the influence of orientation by the doctor blade 32 is reduced by using abrasive grains that are as spherical (regular polyhedron) as possible. However, since the influence of the orientation of the abrasive grains can be reduced in the present invention, it is also possible to use an abrasive grain having a large aspect ratio (major axis / minor axis) which is easily influenced by the orientation or an irregularly shaped abrasive grain. . The average grain size of the abrasive grains is not limited, but when used as a precision cutting grindstone, the average grain size is preferably about 5 to 30 μm. The content of the abrasive grains in the slurry 34 is 1 to
It is preferably about 10% by weight, more preferably 5 to 8% by weight.

The metal binder powder may be any one that can be sintered at a temperature equal to or lower than the melting point of the abrasive grains. For example, tin, lead, nickel, copper, cobalt, chromium, etc., or a mixture thereof can be used. . The particle size of the metal binder powder is preferably 500 μm or less, more preferably 0.5 to 100 μm. The average particle size is 0.
If it is less than 5 μm, the reactivity with water is too strong and the average particle size is 500.
If it is larger than μm, sufficient strength cannot be obtained after sintering. The content of the metal binder in the slurry is 40 to 90% by weight, more preferably 60 to 80% by weight.

The resin binder serves to maintain the structure of the plate after drying the slurry and to adjust the clay of the slurry. The resin binder is preferably an aqueous resin binder such as methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, ethyl cellulose, polyvinyl alcohol, or the like, but an oil resin binder soluble in an organic solvent, if necessary. May also be used. The content of the resin binder in the slurry is preferably 0.5 to 20% by weight, particularly 2 to 10% by weight. 0.5% by weight
If the amount is less than the above, the strength of the plate body 36B after drying is insufficient, and 2
If it is more than 0% by weight, the viscosity becomes too high and shaping becomes difficult.

In the present invention, the abrasive grains and the metal binder are allowed to settle slightly in the slurry layer, and two plate bodies 36B having different abrasive grain distributions and abrasive grain sizes on the upper surface and the lower surface are obtained. By bonding the upper surfaces of the body 36B having a small abrasive grain distribution, it is possible to manufacture a thin blade grindstone in which the abrasive grain distribution is larger on both side surfaces than on the central portion in the thickness direction as shown in FIG. Further, after two plate bodies 36B having different metal binder distributions on the upper surface and the lower surface are obtained, the lower surfaces having a high metal binder distribution of these plate bodies 36B are joined to each other, as shown in FIG. It is also possible to obtain a thin blade grindstone having a high metal binder density in the central portion in the thickness direction rather than the surface and excellent sharpness and high strength.

The surfactant has a function of improving the dispersibility of the abrasive grains and the metal binder powder in the slurry, and specifically, alkylbenzene sulfonate, α-
Examples thereof include anionic surfactants such as olefin sulfonates, alkyl sulfate ester salts, alkyl ether sulfate ester salts and alkane sulfonates, and nonionic surfactants such as polyethylene glycol derivatives and polyhydric alcohol derivatives. it can. The content of the surfactant in the slurry is 0.05 to 5% by weight, especially 0.5 to 3% by weight.
Is preferred. If the amount is less than 0.05% by weight, the above effect cannot be obtained, and if the amount is more than 5% by weight, the effect cannot be further enhanced.

Although not essential to the grindstone raw material slurry,
In addition to the above components, a plasticizer, a combustible agent for promoting pore formation, and the like can be added. The plasticizer is for adding plasticity to the plate body 36B, and includes polyhydric alcohols such as ethylene glycol, polyethylene glycol, and glycerin, sardine oil, rapeseed oil, and oils such as olive oil, ethers such as petroleum ether, and phthalates. Examples thereof include esters such as diethyl acid, di-n-butyl phthalate, diethylhexyl phthalate, dioctyl phthalate, sorbitan monooleate, sorbitan trioleate, sorbitan palmitate and sotubitan stearate. The content of the plasticizer is preferably 0.1 to 15% by weight, more preferably 2 to 10% by weight. If it is less than 0.1% by weight, the plasticizing effect may be insufficient, and if it is more than 15% by weight, the strength of the plate body 36B may be lowered.

The pore-forming combustible agent is for promoting the formation of pores by eliminating it during the sintering of the plate body 36B, and it is a combustible material such as pulp, cotton, lint, corn starch, carboxymethyl cellulose. , Water-insoluble cellulose fiber, polyvinyl butyral resin, polyvinyl resin, acrylic resin, polyethylene resin and the like. The shape of the pore forming combustible agent is not limited,
Specifically, a powdery material of about 0.1 to 200 μm,
A fibrous material having a length of 200 μm or less, preferably about 30 to 120 μm is suitable.

The viscosity of the slurry 34 after mixing is 20,000 to 70,000 cps at 20 ° C., especially 30,000.
A range of up to 55000 cps is preferred. 20000cp
If it is less than s, the porous structure may collapse during drying,
Doctor blade 3 when viscosity is higher than 70,000 cps
There is a possibility that molding by 2 may become difficult.

After the base layer coating device 16 is filled with the base coating material 28 and the slurry coating device 20 is filled with the slurry 34, the endless belt 10 is run. Then, first, the base paint layer 30 is regulated by the gap amount between the doctor blade 26 and the endless belt 1.
0, and the coating layer 30 is dried by the underlayer drying device 18. Furthermore, coating film 3
Doctor blade 3 by slurry application device 20
The slurry layer 36 having a thickness corresponding to the gap amount between the endless belt 2 and the endless belt 10 is applied. The slurry layer 36 is heated and dried by the drying device 24, becomes a plate 36B, is separated from the endless belt 10 at the position of the roll 14, and is formed into a plate S by a cutting device (or punching device) 46. The plate S has the same diameter as the thin blade grindstone to be manufactured, or has a circular or rectangular shape larger than the thin blade grindstone.

After a plurality of plate bodies S are obtained, these plate bodies S are laminated to form a grinding stone master. As shown in FIG. 3, if two plate bodies S are stacked to form a grinding stone prototype, a first plate body S1 and a second plate body S2 having the same thickness should be formed in the respective slurry developing directions. Laminate so that A and B are substantially orthogonal to each other. The slurry developing directions A and B do not have to be completely orthogonal to each other, and may be any direction close to a right angle of about 70 to 110 °.

Further, the first plate S1 and the second plate S2
It is preferable that the lower surfaces (the carrier tape is formed on the lower surface) that are in close contact with the respective endless belts 10 are bonded to each other or the upper surfaces are bonded to each other. By doing so, the warp tendency of each plate S1, S2 can be reversed and the occurrence of warp can be prevented, and even if precipitation of abrasive grains or metal powder occurs during slurry application, the composition of both side surfaces of the grindstone It is possible to prevent unevenness in the cutting direction by making the same.

In order to bond the first plate body S1 and the second plate body S2 together, first, the first plate body S1 and the second plate body S2 are punched out into a grindstone shape, and then they are piled up, if necessary. Or press the first plate S1 and the second plate S
After stacking with No. 2 and pressing as required, a whetstone prototype is produced by punching into a whetstone shape. Next, the grindstone prototype is placed in a heating furnace having an inert atmosphere, a reducing atmosphere, or a vacuum atmosphere, and heat treatment is performed to decompose and volatilize and remove the resin binder contained in the grindstone prototype.
Although the heat treatment conditions for this degassing are not limited,
It is preferable to heat at ˜550 ° C. for 30 to 120 minutes.

After the degassing process is completed, the grinding stone prototype is taken out of the heating furnace and hot pressed to sinter it. The hot pressing conditions are not limited because they differ depending on the type of metal binder used, but generally, the pressing pressure is 10
0~1000kgf / cm ² or so, the heating temperature is 600
The heating time is about 900 ° C. and the heating time is about 10 to 60 minutes.
The atmosphere during hot pressing is preferably an inert atmosphere, a reducing atmosphere, or a reduced pressure.

By performing such hot pressing, the metal binder particles are bonded to each other, and the plate bodies S1 and S2 are further bonded.
Bonding proceeds even at the interface of and both are integrated. The grindstone may have no pores, but when it is necessary to make the grindstone porous, the hot press pressure may be lowered to form the necessary amount of pores. If the pores are formed, the pores opening on the surface of the grindstone can hold the grinding liquid for lubrication and cooling, and the pores can serve as chip pockets to improve the chip discharging property and enhance the cutting performance or the grinding performance. When forming pores, the porosity is preferably about 5 to 15% by volume from the viewpoint of enhancing performance.

After the sintering is completed, the obtained whetstone prototype is shaped according to the desired whetstone shape to obtain a thin blade whetstone. In this thin blade grindstone, as shown in FIG. 4, the abrasive grains are oriented in the arrow A direction on the one surface side, and the abrasive grains are oriented in the arrow B direction orthogonal to the A direction on the other surface side. The "orientation" referred to here means that a certain tendency is generated in the direction and concentration of the abrasive grains, and generally, it is considered that the major axis direction of the abrasive grains is aligned with the developing direction by the doctor blade 32. The opposite may occur depending on the time conditions.

In the thin-edged grindstone of the present invention, since the orientation directions of the abrasive grains are orthogonal to each other on both surfaces, the influence of the abrasive grain orientation is offset and minimized. Therefore, since the grinding performance is uniform over the entire circumference of the grindstone, it is possible to reduce the possibility of vibration of the grindstone during cutting and chipping of the work material due to uneven grinding performance.

Next, FIG. 5 shows a second embodiment of the present invention. In this method, a mesh sheet M for reinforcing a grindstone is arranged between the plate bodies S1 and S2 obtained in the same manner as in the first embodiment, and then the plate bodies S1 and S2 are joined together, and then the first It is characterized in that it is sintered similarly to the embodiment.

The mesh sheet M is preferably, for example, a lattice mesh body formed of high melting point metal, ceramics, carbon fiber, glass fiber or the like.
The present invention is not limited to this, and may be a non-woven fabric.
Examples of the refractory metal include tungsten, rhenium, molybdenum, tantalum, and alloys thereof. Further, as ceramics, aluminum oxide,
Examples include titania, silicon nitride, zirconia and the like. The fiber thickness of the mesh sheet M is preferably smaller than the average particle size of the abrasive grains, and generally preferably 5 to 30 μm.

Plates S1, S sandwiching the mesh sheet M
By bonding and sintering 2, the metal binders in the plate bodies S1 and S2 pass through the mesh-like sheet M and are bonded to each other, so that the mesh-like sheet M is taken in, so that the rigidity of the thin blade grindstone is first. It is improved as compared with the embodiment. Further, even if the grindstone breaks, the presence of the mesh-shaped sheet M has an advantage that fragments are less likely to scatter.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, between the plate bodies S1 and S3 of the same quality,
A plate having the same or different quality as these is sandwiched and sintered to obtain a three-layered thin blade grindstone. Plates S1 to S3
Any of these can be manufactured by the apparatus as shown in FIG. 1, but in the plate body S2, the abrasive grain size and the degree of concentration can be made different. In this case, the orientation direction of each plate S1, S2, S3 is indicated by arrow A,
Adjacent ones may be orthogonal to each other as shown by B and C, or may be different from each other by 120 ° as shown in FIG. By bonding and sintering the plate bodies S1, S2, S3 in different orientations as described above, the orientations of the abrasive grains exposed on the outer peripheral surface of each layer can be different from each other, and cutting in the circumferential direction can be performed. It is possible to offset unevenness in performance and balance the sharpness of the entire grindstone. If the orientation of the abrasive grains on both side surfaces of the grindstone has a greater influence on the cutting performance than on the outer peripheral surface of the grindstone, it is desirable to arrange as shown in FIG. That is, the abrasive grain orientation directions of the plate bodies on both sides may be orthogonal to each other, and the plate body in the center may be oriented in any direction.

[0043]

EXAMPLES Next, the effects of the present invention will be demonstrated with reference to examples. [Example] 50 g of copper powder having an average particle size of 5 μm and an average particle size of 10
10 g of tin powder having a diameter of 10 μm, 12 g of iron powder having an average particle diameter of 10 μm, 8 g of 20/30 μm diamond abrasive grains having a trade name “IMM” manufactured by Tomei Dia Co., Ltd. . Organic binder composition: Methylcellulose 3% by weight Surfactant 0.5% by weight Water balance

The kneaded slurry is drawn into a thin plate shape on a flat sheet by a doctor blade method, and a width of 120 is obtained.
A plate body having a size of mm × length 1000 mm × thickness 0.5 mm was obtained. The plate body was dried to obtain a green molded body, and an annular body having an outer diameter of 100 mm and an inner diameter of 40 mm was punched out from the green molded body by a hand press. The green compact can be reused as a raw material by adding the amount of hot water converted by the above ratio and returning it to the slurry.

Two annular green molded bodies were prepared, the contact surfaces of the sheets were made to face each other, and the doctor blades were spread in different directions by 90 °, and the sheets were loaded into a carbon mold. The binder was removed by heating in a hydrogen atmosphere at 450 ° C. for 30 minutes.

Next, it is again sandwiched between carbon molds and 200 k
While pressurizing at a pressure of g / cm ² , at 700 ° C for 30 minutes,
Sintered in nitrogen atmosphere, outer diameter 100mm x inner diameter 40mm
A grindstone prototype having a thickness of 0.25 mm was obtained. This is further lapped and finished, outer diameter 100 mm × inner diameter 40 mm ×
A grindstone of the example of 1A8 type having a thickness of 0.20 mm was obtained.

[Comparative Example] Using the same raw material slurry as in the example, a flat sheet was drawn on a flat sheet by a doctor blade method to obtain a plate body having a width of 120 mm × a length of 1000 mm × a thickness of 1.0 mm. The plate body is dried to obtain a green molded body, and the outer diameter of the green molded body is 100 m.
A circular ring having a diameter of m and an inner diameter of 40 mm was punched by a hand press.

The above annular green molded body was loaded into a carbon frame and heated at 550 ° C. for 30 minutes in a nitrogen atmosphere to carry out a binder removal treatment. Next, it is sandwiched between carbon molds again and pressurized at a pressure of 200 kg / cm ² , while being sintered in a nitrogen atmosphere at 750 ° C. for 30 minutes, and a whetstone prototype having an outer diameter of 100 mm × an inner diameter of 40 mm × a thickness of 0.25 mm. Got This is further lapped and finished, 1A8 with an outer diameter of 100 mm x an inner diameter of 40 mm x a thickness of 0.20 mm
A comparative grindstone forming a mold was obtained.

Using each of the grindstones of Examples and Comparative Examples, a cutting test was conducted 100 times under the following conditions, and the maximum chipping and the maximum warp amount of each cut surface were measured after 50 times of cutting and after 100 times of cutting. . Testing machine: Fujikoshi's micro grinder grinding wheel peripheral speed: 10000 rpm Feed: 100 mm / min Pitch: 1.0 mm Number of cuts: 100 Depth of cut: 2.5 mm Grinding liquid: Emulsion processed product: Al ₂ O ₃ · TiC length 50 mm x width 50 mm
× Thickness 2.0 mm The test results are as shown in Table 1.

[0050]

[Table 1]

As shown in Table 1, in the grindstones of the examples according to the present invention, the amount of chipping and the amount of warp could be significantly reduced as compared with the grindstone of the comparative example.

[0052]

As described above, in the method for manufacturing a thin blade grindstone according to the present invention, since the orientation directions of the abrasive grains in each of the laminated abrasive grain layers are different from each other, the influence of the orientation of the abrasive grains is canceled out. It Therefore, the grinding performance can be made uniform over the entire circumference of the grindstone, and vibration of the grindstone occurs during cutting,
The possibility of chipping of the work material due to uneven grinding performance can be reduced.

[Brief description of drawings]

FIG. 1 is a plate manufacturing apparatus used in an embodiment of a method for manufacturing a thin blade grindstone according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of a slurry coating apparatus of the apparatus.

FIG. 3 is a perspective view showing a method of stacking plate bodies according to the first embodiment of the present invention.

FIG. 4 is a plan view showing a state in which plate bodies are stacked.

FIG. 5 is a perspective view showing a method of stacking plates according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing a method of stacking plates according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing a method of stacking plate bodies according to a fourth embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view showing another embodiment of the present invention.

FIG. 9 is an enlarged cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols] 10 Endless belt (base) 16 Underlayer coating device 20 Slurry coating device 32 Doctor blade (coating thickness control member) 34 Grindstone raw material slurry 24 Dryer S, S1-S3 plate A, B, C Orientation direction of abrasive grains in plate

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B24D 3/00 B24D 3/06 B24D 5/12

Claims (3)

(57) [Claims] 1. A step of producing a slurry in which a metal binder powder and abrasive particles are dispersed in a resin binder solution, and the slurry is formed by spreading the slurry on a substrate by a coating thickness regulating member. A constant thickness, a step of solidifying the applied slurry and then peeling it from the substrate to obtain a plate body, and the obtained plate bodies so that their developing directions are different from each other. A method of manufacturing a thin blade grindstone, comprising the steps of laminating and sintering. 2. A step of preparing a slurry in which a metal binder powder and abrasive particles are dispersed in a resin binder solution, and the slurry is spread by a coating thickness regulating member while being supplied onto the substrate. To a constant thickness, a step of solidifying the applied slurry and then peeling it from the base body to obtain a plate body, two obtained plate bodies, and their developing directions are mutually different. A method of manufacturing a thin blade grindstone, comprising the steps of stacking so as to be orthogonal to each other and then sintering. 3. The content of abrasive grains in the slurry is 1 to 10% by weight, the content of metal binder is 40 to 90% by weight, and the content of resin binder is 0.5 to 20% by weight. The method for producing a thin blade grindstone according to claim 1 or 2 , characterized in that.