JPH02167670A - Manufacture of grindstone - Google Patents

Abstract

PURPOSE:To manufacture a grindstone of long life at high speed and low cost and to improve grinding performance by fixing abrasive grins by thermal spraying method to the surface of a grindstone base metal. CONSTITUTION:An abrasive grain 3 having a specific grinding performance and a bonding material 2 are simultaneously subjected to thermal spraying from a thermal spraying gun 4 to a grindstone base metal 1 approximate to a product external shape. Thus, a grindstone of less grinding resistance, inexpensive and of good sharpness, of high working efficiency and yet of long service life can be manufactured at high speed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a grinding wheel, and more specifically, particles (hereinafter referred to as "abrasive grains") of fused alumina, silicon carbide, diamond, cubic boron nitride, etc. ) is fixed to a whetstone base material by thermal spraying.This relates to a method for manufacturing a whetstone.

[Conventional technology and its problems]

Conventional metal bond, resin bond, and vitrified bond grindstones have the following problems in production and use.

There are two manufacturing methods for metal bond grindstones: electrodeposition and electroforming.

This grindstone has abrasive grains held in place by metal bonds, and has a high holding power, but since there are no pores, the grinding resistance is high, causing cranking and pitting on the machined surface, reducing the strength of the part. Another disadvantage is that it takes a long time to provide a thick grinding layer. When using the sintering method, cracks occur at the joint between the base material and the grinding part, and in the worst case, personal injury occurs.

Resin bonded whetstones have pores and are sharp, with very little cracking or pitting.

Since the bonding material is resin, it is susceptible to the heat generated during grinding and carbonizes, reducing the holding power of the abrasive grains, resulting in increased wear of the grindstone and poor grinding efficiency.

Vitrified bond whetstones do not have a self-generating effect and if they are not noticeable, they will clog and become weak, and thin whetstones cannot be manufactured. Also, they require skill to use, and if handled incorrectly, it will cause damage.
There was a time when accidents such as cracks occurred.

[Object of the present invention]

The present invention overcomes the above-mentioned problems and uses a thermal spraying method to create a grinding wheel that has appropriate pores in the metal bond that reliably holds abrasive grains, prevents the occurrence of cranking and pitting during two processes, and has low grinding resistance. Manufactured cheaply and with good sharpness,
The present invention provides a technology for manufacturing grindstones with high machining efficiency and long life at high speed.

[Means for solving problems]

In order to achieve the above object, the method for manufacturing a whetstone by thermal spraying of the present invention involves simultaneously spraying abrasive grains (1) and a binder (2) having a predetermined grinding performance onto a whetstone base material that approximates the outer shape of the product, or ■ and the bonding material ■ may be sprayed separately, or the abrasive grains may be controlled with a screen or the like and sprayed in a slit shape, a grid shape, or randomly to form the ground portion ■ and the non-grinded portion ■. You can also do it. A grindstone is thus constructed by laminating abrasive grains and a binder by a thermal spraying method.

〔Example〕

A grindstone manufactured by the thermal spraying method has a structure roughly shown in FIGS. 1 and 2. Figure 1 shows a full-surface abrasive grain grindstone 2 Figure shows a whetstone with an abrasive grain part and a non-abrasive part Available. The base material is also disc-shaped.

It can be applied to any shape such as a round cylinder, endless belt, or flat plate. The surface of the whetstone base material ■ is cleaned with a solvent to remove oils and fats, and then the oxides on the surface are removed by blasting, and at the same time, the surface of the whetstone is roughened.
Or molybdenum or nickel for the grinding wheel base material.
It is also possible to directly spray aluminum composite materials and take advantage of the roughness of the coating surface. The above-mentioned surface roughening is not specific and may be performed in combination. This surface treatment removes the oxide film on the surface of the grinding wheel base material and roughens the surface, preventing the abrasive grains and binder from floating or peeling. I can do it.

The bonding material ■ is a self-bonding material, such as a composite of nickel and aluminum (components: nickel 80% aluminum 2).
0%), or in addition to the above materials, use a binder of a self-fluxing alloy (components: 75% nickel, 5% to 10% boron, 1% to 2% silicon, 2% to 3% iron, 4% cobalt, 1% or less). Good too.

The reason why these materials are suitable as bonding materials is that they are strong against impact, have good corrosion resistance and heat resistance, and are easy to bond with abrasive grains.

As the grinding abrasive grains, fused alumina (AI303, silicon carbide (SIC), diamond (D), cubic boron nitride (CBN), etc.) are used, and can be changed as desired depending on the purpose of grinding.A grindstone with strict grinding conditions In this case, using the above abrasive grains coated with nickel or copper by electroless plating will bond the bonding material more firmly.The bonding material (abrasive grains) is simultaneously sprayed from a thermal spray gun (2) to form the base material of the whetstone. Alternatively, as shown in Figure 2, the grinding layer can be formed in a partially rising pattern, for example in the form of a slit, lattice, or strip. A grinding part ■ can be provided.

The thermal spraying method can be carried out normally in the atmosphere as shown in Fig. 11 and Fig. 2, but in order to further enhance the function of the grinding wheel, as shown in Fig. It is better to carry out thermal spraying by installing it in a chamber that can control the reduced pressure and non-oxidation state.The advantage of thermal spraying under reduced pressure is that the heating temperature of the grindstone base material can be increased, preventing oxidation of the abrasive grains and binder and improving the adhesion strength. However, the spraying efficiency can be improved, and chemical metal changes in the sprayed material before and after spraying are less likely to occur.

[Function] As shown in FIG. 4, the present invention is a method for manufacturing a whetstone using a thermal spraying method that has appropriate pores, has low grinding resistance, has good grinding performance, and has a long life.

(1) First, the surface of the grindstone base material (2) is cleaned with a solvent and blasted to degrease, remove surface oxides, and roughen the surface.

(2) Next, the bonding material (abrasive grains) is sprayed onto the grinding wheel base material using a thermal spray gun (2) to form a ground portion (2) with appropriate pores (2).

As described above, it consists of the step of laminating the bonding material ■abrasive grains ■ onto the grindstone base material ■ using a thermal spray gun ■. By carrying out this thermal spray lamination process, it is possible to manufacture a whetstone in which the base material, binder, and abrasive grains are firmly adhered to each other, and which also has an appropriate amount of pores.

〔Effect of the invention〕

According to the method of manufacturing a grindstone using the thermal spraying method of the present invention, a grindstone with good grinding performance and a long life can be manufactured at high speed and at low cost.In addition, it is possible to produce a wide variety of products in small quantities with the same equipment, and also to achieve the following: The base material of the whetstone with these characteristics is not limited to plastic, metal (aluminum, stainless steel, iron,
All materials such as copper, brass, cloth, and wood can be used as the base material for whetstones.

■The shape of the whetstone base material is not limited; any shape can be used as the base material of the whetstone, such as a 3-disk shape, a circular cylindrical endless belt shape, or a flat plate shape.

■Depending on the purpose of use of the grindstone, any abrasive grains such as fused alumina, silicon carbide, diamond, cubic boron nitride, etc. can be used, and it is also possible to use a mixture.

■It is possible to arbitrarily change the holding power of the abrasive grains, making it easy to obtain a degree of bonding that matches the conditions of the grinding operation.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the grinding part (2) being thermally sprayed over the entire surface of the grindstone base material (2). FIG. 2 is an explanatory diagram showing controlled thermal spraying of the grinding portion and non-grinding portion of the grindstone base material. Figure 1,
FIG. 2 is a schematic explanatory view of spray molding a grindstone in the atmosphere. FIG. 3 is a schematic explanatory view showing a grindstone being thermally spray molded in a reduced pressure non-oxidation chamber (1). [Explanation of main symbols] ■...Whetstone base material 2...Binding material 3...
Abrasive grains 4... Thermal spray gun 5... Decompression chamber 6... Grinding section 7... Non-grinding section 8.
・・・Stomata 9・・・Vacuum pump

Claims (4)

[Claims] (1) A method for manufacturing a whetstone, characterized in that abrasive grains are fixed to the surface of a whetstone base material by thermal spraying. (2) A method for manufacturing a whetstone, characterized in that abrasive grains are fixed on the surface of a whetstone base material by thermal spraying in a reduced-pressure, non-oxidizing chamber. (3) The material of the grindstone base material in (1) and (2) above is not specified, such as plastic, metal, cloth, wood, etc. (4) The shape of the abrasive grain base material in (1) and (2) above is not specified, such as a disc, a round cylinder, an endless belt, a flat plate, etc.