Method for preparing monolayer cubic boron nitride grinding wheel by pressure welding

Abstract

Disclosed is a method for preparing a monolayer cubic boron nitride grinding wheel by pressure welding. The method includes the following steps of (1) selecting a grinding wheel base material and using a mechanical processing method to prepare a grinding wheel substrate; (2) preparing an amorphous alloy binding layer with a uniform thickness in a protection environment; (3) configuring and fixing cubic boron nitride abrasive particles on the surface of the amorphous alloy binding layer at the room temperature, manufacturing a grinding wheel blank and placing a ceramic pressing piece and a pressing matter on top of the grinding wheel blank; and (4) placing the grinding wheel blank, the ceramic pressing piece and the pressing matter in a heating furnace and then rapidly cooling to the room temperature to obtain the monolayer cubic boron nitride grinding wheel. The amorphous alloy material has the advantages of high tensile strength and hardness, low heat expansion coefficient and the like, so that the strength and abrasion resistance of a grinding wheel combination material can be improved, and a residual stress formed between the abrasive particles and the combination material can be reduced. The abrasive particles are pressed into the amorphous alloy, due to the fact that many active elements which can be reacted with cubic boron nitride are contained in the material, a small amount of compound can be formed through prolonging the heat preservation time, and the holding force of the amorphous alloy on the abrasive particles can be increased. The processing quality of the prepared grinding wheel surface is high, and the grinding wheel can be used for high precision grinding processing.

Description

technical field [0001] The invention belongs to the field of making superhard abrasives, in particular to a method for preparing a single-layer cubic boron nitride grinding wheel by pressure welding. Background technique [0002] Cubic boron nitride has high hardness, thermal stability and chemical inertness. The prepared abrasive can solve the problem of difficult processing of materials with high hardness and good toughness. At the same time, it has sharp grinding, good wear resistance, less unit wear, and high productivity. It has the characteristics of high surface quality and is widely used in the abrasive tool industry. In order to meet the needs of production and improve product quality, people continue to propose new methods of making abrasive tools and conduct research on new methods, mainly how to improve processing efficiency, product quality and abrasive tool life. [0003] As an abrasive tool, the following requirements must be met: 1) In the direction of grind...

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Problems solved by technology

The superhard material abrasive tools prepared by brazing can meet the above requirements, but the distribution of abrasive particles is difficult, and there is a large difference in physical and chemical properties between the brazing material and the abrasive particles, resulting in a large residual stress at the joint after brazing

[0006] Silver-based solder (Ag-Cu-Ti alloy) is the earliest material used to prepare abrasive tools for brazing superhard materials. However, silver-based solder is expensive, the cost of abrasive tool preparation is high, and the hardness of the solder is low. The abrasiveness is not good. During the use of the abrasive tool, the proper grinding ratio between the abrasive particles and the brazing layer cannot be maintained, which will easily cause the abrasive to fall off prematurely and reduce the life of the abrasive tool.

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