JPS59107861A - Manufacture of cutting grindstone - Google Patents

Abstract

PURPOSE:To manufacture easily an extremely thin cutting grindstone, in which superhard abrasive grains will never be dropped easily, by a method wherein an annular metallic thin plate is provided with an extremely thin grindstone supporting core at the circumferential rim thereof and the superhard abrasive grains of diamond or the like are bonded on the core electrically in order to form a cutting edge part. CONSTITUTION:Masking layers are formed remaining the rim parts of the front and rear surfaces of the annular metallic thin plate 1 as exposed parts, thereafter, the exposed parts are etched to form the extremely thin abrasive grains supporting parts 2. The extremely fine superhard abrasive grains 3 of diamond, cubic crystallizable boron nitride or the like are bonded electrically on the front and rear surfaces of said core parts 2 so as to be thicker than the thickness of the metallic thin plate 1, thereafter, the masking layers are removed to manufacture the cutting grindstone. In this case, the superhard abrasive grains 3 are bonded electrically by utilizing a metal, separated out of the core by the electric bonding, as a binding agent 5 to form the cutting edge parts. According to this method, the extremely thin cutting grindstone, in which the superhard abrasive grains 3 will never be dropped out easily, may be manufactured easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an ultra-thin cutting wheel used for cutting or grooving hard materials.

As an ultra-thin cutting wheel used for cutting hard materials and grooving, a large number of small notches are provided in the peripheral edge of an annular thin metal plate in a serrated manner, and each small notch is injected with diamond, cubic boron nitride, etc. It is known that ultra-fine carbide abrasive grains are attached with a synthetic resin binder. Therefore, there is a drawback that the grinding wheel falls off due to grinding heat and vibration during use, and there is a strong demand in the industry for a method of manufacturing a cutting wheel that can provide a cutting wheel that does not have such a drawback at a low cost.

The present invention has been completed with the aim of producing a cutting wheel that meets the above-mentioned demands.The present invention was completed with the aim of producing a cutting wheel that meets the above-mentioned demands. The exposed part is corroded to form an ultra-thin abrasive support core part, and then an extremely fine ultra-fine material such as diamond or cubic boron nitride is coated on the front and back surfaces of the abrasive support core part to be thicker than the thickness of the thin metal plate. This method is characterized in that the masking layer is removed after fi electrodeposition of hard abrasive grains.

The annular thin metal plate used in the present invention is generally an extremely thin one with a thickness of about 02 to 0 mm, which is obtained by punching an iron plate, phosphor bronze plate, etc. into an annular shape. First, after washing, a photosensitive resin for photolithography, which is made of polyamide resin as a base and has been imparted with photosensitivity, is applied to both the front and back surfaces of the thin metal plate and dried. Next, a negative film in which the portion corresponding to the abrasive grain supporting core material is developed into a dark non-transparent region on the peripheral blade portion is baked in close contact with the photosensitive resin surface of the surface of the thin metal plate to form the abrasive grain supporting core material. If the photosensitive resin is exposed and developed, the exposed portion will remain as an insoluble portion and form a masking layer, but the portion corresponding to the abrasive support core material that was not exposed will be exposed and developed. It will dissolve and appear as an exposed part. Next, the thin metal plate with this masking layer formed on both the front and back sides is immersed in a corrosive liquid such as an aqueous ferric chloride solution, or the corrosive liquid is sprayed on both the front and back sides of the thin metal plate to form a masking layer on both the front and back sides. If only the exposed part where no . Apply the coating to both the front and back surfaces, dry it, and then, if necessary, remove the dark color from the part corresponding to the shape for holding the abrasive grains or the small concave part for filling the abrasive grains. A large number of negative films are arranged at predetermined intervals as transparent parts, and the parts corresponding to the shape for holding abrasive grains are removed and exposed, and holes for holding abrasive grains are also formed on the photosensitive resin surface on the back side. The part where a through hole is to be obtained overlaps in a symmetrical position.The part where a small concave part for filling abrasive grains is to be obtained is an unexposed part of the surface where each of the non-transparent parts of the six colors shown in mJ is. By aligning the negative film with the surface pattern, baking it in close contact with the surface pattern, and developing it to form a masking layer and an exposed area, and then corroding it in the same manner as above, an extremely thin layer can be created. Since an annular ultra-thin metal plate having the required abrasive grain supporting core material part is obtained, after cleaning this, only the masking material of the abrasive grain supporting core material part is removed, without removing other masking materials. Ultra-fine ultra-hard abrasive grains such as diamond or cubic boron nitride with an average grain size of about toμ or less are embedded in a layer of the ultra-hard abrasive grains in a plating bath at the bottom, and the abrasive support core material is If ultra-fine carbide abrasive grains are electrodeposited on both sides and the tip surface, the plating metal as a binder will precipitate only on the abrasive grain parts that are not coated with the masking layer, and the carbide abrasive grains will support the abrasive grains. Since it is firmly fixed to the core material, if the masking layer is then removed using a solvent and finishing processing such as wrapping is applied, even ultra-thin products that cannot be obtained using conventional manufacturing methods can be made. This means that it can be mass-produced easily. Note that the manufacturing method is the same whether the abrasive grain supporting core portion provided on the annular thin metal plate is provided on the outer periphery or the inner periphery of the annular thin metal plate.

The cutting wheel manufactured in this way is shown in the figure.
An ultra-thin abrasive support core material (2) is provided on the peripheral cutting edge of the annular thin metal plate (1), and ultra-fine carbide particles such as diamond, cubic boron nitride, etc., with an average grain size of ≠Oμ or less are provided here. The abrasive grains (3) are deposited by electrodeposition, and the metal is used as a binder (5). When the grinding wheel is mounted on an axle and rotated at high speed, and a workpiece is brought into contact with the peripheral cutting edge of the thin metal plate (1), the cutting action of the carbide abrasive grains (3) provides good sharpness and machining accuracy. It is equipped with holes for holding abrasive grains in the abrasive grain supporting core part of the peripheral blade part of the annular thin metal plate (1) as required. Alternatively, by providing a small recess, the carbide abrasive grains (3) filled in the abrasive support core part (2) are firmly attached to the ultra-thin abrasive support core part (2) by electrodeposited metal. The thin metal plate (1) is firmly fixed to the metal plate (1) and will not be broken even by the unidirectional force applied to the periphery of the metal plate (1) during rotation. Since it is thicker than (1), there is little contact friction between the body of the thin metal plate and the workpiece, similar to the sawtooth clam, and it is easy to remove cutting chips, so the stress exerted on the ultra-thin metal sheet is Compared to a conventional cutting wheel, which is small and has many small notches arranged in a sawtooth pattern around the periphery of a thin metal plate and has carbide abrasive grains attached to each small notch, the durability is significantly increased, and the durability is significantly increased. With a cutting wheel, when correcting the runout on the outer periphery, there is almost no cutting edge, so it was not possible to correct the runout, whereas with the cutting wheel, the cutting edge can be effectively used up to the inner edge, so the runout can be corrected. Corrections can be made and cutting accuracy can be improved. ' As is clear from the above description, the present invention has been developed in the industry as a method for manufacturing cutting wheels that can easily produce ultra-thin cutting wheels from which ultra-hard abrasive grains such as diamond and cubic boron nitride do not easily fall off. The benefits it brings to the market are extremely limited.

Example A well-known photosensitive resin whose main material is polyamide resin is
．． 2 After coating a tnrt+ annular iron plate, a negative film of the same size as the iron plate and having an annular dark non-transparent area with a width of 2 mm at the periphery was applied to both the front and back sides of the iron plate to avoid image misalignment. After exposure and printing, remove both negative films and wash the photosensitive resin on both the front and back sides of the iron plate with lower alcohol containing dissolved calcium chloride to wash away the unexposed parts of the photosensitive resin. As a result, a masking layer is formed on both the front and back surfaces of the peripheral edge portion of the current iron plate, leaving a portion corresponding to the abrasive grain supporting core material portion as an exposed portion. Next, this iron plate was immersed in a ferric chloride aqueous solution with a flow rate of 'AO°C and 1 lOBe for 6 minutes to corrode the exposed portion, washed with water, and dried to form an abrasive support core with a thickness of Q, / sn + y. Further, a photosensitive resin with a thickness of 02 mm is applied to the front and back surfaces of the abrasive grain supporting core material part, and a width aj; difference! Seven of the two negative films, each of which has a large number of dark-colored non-transparent parts arranged at the required intervals, are brought into close contact with the surface of the abrasive grain supporting core material part, and the other one is placed on the back side. The sheets are placed in close contact with each other so that the dark non-transparent parts are located between the dark non-transparent parts of the negative film on the front side, and after exposure and printing, both negative films are removed and the procedure is the same as above. A masking layer was formed by immersing it in the ferric chloride aqueous solution for 4 minutes to etch it, then washing it with water and drying it to form a masking layer with a width of 0.0 m, length of 2 mm and depth of 0.0 mm. ;
A small concave portion of MW was arranged on the front and back surfaces of the abrasive grain supporting core material part, and then nickel sulfate) v211-Og, nickel chloride /I/! was added to /l of water. ! 9 and boric acid 309 are dissolved and embedded in a layer of ultra-fine diamond, cubic boron nitride, or other super-hard abrasive grains with a particle size of 10 μ or less in a pHj plating bath filled with the bottom. , the iron plate is plated at the temperature of the plating bath at jO°c and the N flow density ← to strengthen the cemented carbide abrasive grains with nickel precipitated only on the abrasive grain support core material where no masking layer is formed. After electrodeposition, the masking layers formed on the front and back surfaces of the iron plate were removed, and finishing processes such as wrapping were performed to create the product.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a cutting wheel manufactured according to the present invention, FIG. 2 is a sectional view of the main part, and FIG. 3 is a schematic diagram showing another embodiment of the cutting wheel manufactured according to the present invention. (1): Gold (thin plate), (2): Abrasive grain support core material, (3)
: Carbide abrasive grain, (4): Mounting hole, (5)! Binding agent. Figure 2

Claims (1)

[Claims] A masking layer is formed by leaving the peripheral edges of the front and back surfaces of the annular thin metal plate as exposed parts, and then the exposed parts are corroded with a corrosive solution to form an extremely thin abrasive support core. IJ is applied ultra-fine carbide abrasive grains such as diamond or cubic boron nitride to the front and back surfaces of the material to a thickness that is thicker than the thickness of the thin metal plate.
I Method for manufacturing a cutting wheel characterized by removing the masking layer after electrodeposition 0