Diamond grinding plate used for accurately grinding double end surfaces of sapphire and manufacturing method of diamond grinding plate

Abstract

The invention relates to a diamond grinding plate used for accurately grinding the double end surfaces of a sapphire and a manufacturing method of the diamond grinding plate. The diamond grinding plate comprises a metal matrix and a diamond grinding layer on the metal matrix. The diamond grinding layer is made of, by weight, 20-50 pats of diamond micro powder with the particle size being 1-10 [mu]m, 20-30 pats of white corundum micro powder with the particle size being 1-10 [mu]m, 3-5 parts of cerium oxide, 15-30 parts of a ceramic binder, 2-5 parts of bentonite, 4-10 pats of starch and 20-40 pats of water. The ceramic binder is formed by mixing lead oxide, sodium feldspar, boron glass and quartz at the ratio of 1:(1-5):(4-15):(4-25). According to the manufactured diamond grinding plate used for accurately grinding the double end surfaces of the sapphire, the high water permeability can be kept through the grinding layer; the purposes of grinding removing and continuous self sharpness are achieved due to the fact that water permeates outwards inside the grinding plate while grinding is conducted; the machining efficiency of the double end surfaces of the sapphire is improved; and the high surface quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of superabrasive tools, and is mainly used for double-end processing of sapphire used for electronic devices, clocks, optical parts and window materials, and in particular relates to a diamond grinding disc for precise grinding of sapphire double-end surfaces and a manufacturing method thereof. Background technique [0002] The sapphire material is more and more widely used in watch mirrors, electronic devices, and optical materials, and the grinding process of its double ends is an essential process. However, the chemical properties of sapphire are stable, and the physical hardness can reach 9 on the Mohs scale, so grinding is very difficult. The biggest problem with the current double-face processing is the low processing efficiency, which greatly increases the cost of sapphire. [0003] At present, the double-face grinding of sapphire windows is mainly divided into rough grinding, fine grinding, rough po...

AI Technical Summary

Problems solved by technology

The rough grinding process has high processing efficiency, but the sapphire sheet after rough grinding has deep texture, and direct rough polishing cannot achieve the result of improving processing efficiency. Therefore, if the processing efficiency and surface quality of finishing can be improved, and the thickness of the damaged layer can be reduced, the The processing efficiency will be greatly improved

[0005] At present, the fine grinding of sapphire is due to the use of micropowder grade SiC or B 4 C, its processing efficiency is less than 0.02mm / h, and there will be defects such as scratches during processing

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