Online self-sharpening metallic bond and super-hard abrasive precision grinding pellet and preparation method thereof

Abstract

The invention provides an online self-sharpening metallic bond and super-hard abrasive precision grinding pellet and a preparation method thereof and belongs to the technical field of precision grinding pellets. Raw materials of the precision grinding pellet comprise a super-hard abrasive and a metallic bond, wherein the super-hard abrasive is diamond micro-powder; the diamond concentration falls within a range of 75-100 %; and the metallic bond uses a multicomponent alloy bond whose main components are copper powder, tin powder, aluminum powder, copper-clad ball shaped graphite powder, silicon dioxide and ferroferric oxide powder. The preparation method comprises the following steps: uniformly mixing and stirring the diamond micro-powder as well as the copper powder, the tin powder and the aluminum powder; adding polyvinyl alcohol to a mixture and mixing the polyvinyl alcohol and the mixture; adding the silicon dioxide, the copper-clad ball shaped graphite powder and the ferroferric oxide powder to an obtained mixture and mixing these materials and the obtained mixture; filling the mixture into a graphite mold; maintaining the pressure of the graphite mold for 5-10 minutes after pressurizing the graphite mold to 100-250 MPa; and carrying out hot pressing sintering on the graphite mold in a sintering furnace, wherein the sintering atmosphere is ammonia decomposition gas. Through the adoption of the online self-sharpening metallic bond and super-hard abrasive precision grinding pellet provided by the invention, online automatic sharpening can be achieved without blockage and offline repairing.

Description

Technical field [0001] The invention relates to an online self-sharpening metal bond super-hard abrasive fine grinding sheet and a preparation method thereof, belonging to the technical field of fine grinding sheets. Background technique [0002] In precision grinding processing, metal bond diamond sintered abrasive tools are widely used in machinery, electronics, construction, geology, aerospace, nuclear energy, national defense and cutting-edge technology. The commonly used metal bond for diamond abrasive tools is mainly bronze bond, which has stronger bonding force than resin bond, good wear resistance, good geometric shape retention of the workpiece, long service life, large load, but poor self-sharpening , Easy to block, and easy to cause burns on the surface of the workpiece, poor surface roughness, high cost, low processing efficiency. At present, scientific researchers at home and abroad are committed to improving the composition ratio and selecting special materials, an...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an online self-sharpening metal bonded tool for several major problems such as the bronze bonded diamond abrasive tools commonly used in precision grinding are easy to block, difficult to repair, easy to cause burns on the surface of the workpiece, high cost, and low processing efficiency. Agent superabrasive fine grinding sheet and preparation method thereof

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