Laser-induced heat-cracking grinding method for aluminum oxide engineering ceramics

Abstract

The invention relates to a laser-induced heat-cracking grinding method for aluminum oxide engineering ceramics. The laser-induced heat-cracking grinding method for the aluminum oxide engineering ceramics is characterized by comprising the following steps of 1 using Nd: YAG laser as a heat source to heat aluminum oxide engineering ceramic part surfaces, using Ar gas to perform cooling and inducing initial cracks in advance; 2 performing precise wet-type grinding after the initial cracks are produced on the aluminum oxide engineering ceramic part surfaces, wherein water-based cooling liquid is selected, liquid supply pressure is 6MPa, the grinding wheel linear speed is 80m / s, the grinding depth is 2mm, and the feeding speed is 2.2m / min. By applying the laser-induced heat-cracking grinding method, crack-free fused-metamorphic-layer low-roughness and high-quality machined surfaces can be obtained, and the machinability of ceramic materials can be remarkably improved. Compared with traditional aluminum oxide engineering ceramic grinding methods, large grinding depth can be adopted to perform machining. The laser-induced heat-cracking grinding method is a novel machining method for engineering ceramics and other hard, crisp and difficultly-machined materials.

Description

technical field [0001] The invention relates to a grinding processing method, in particular to a processing method for laser-induced thermal cracking grinding of alumina engineering ceramics. Background technique [0002] Alumina engineering ceramics have been increasingly widely used due to their many superior properties such as high strength, high hardness, wear resistance, high temperature resistance and good insulation properties. It can be used for nozzles for sandblasting, heat conductors for textiles and backflow covers for rockets, as well as high-temperature experimental instruments and chemical parts, bearings, spark plugs for internal combustion engines, pistons and catalyst carriers. Using alumina engineering ceramics to replace metal moving parts (pistons, piston pins, etc.) can reduce the quality of parts, reduce friction, save energy and reduce vibration in internal combustion engines. The mechanical seal ring made of alumina engineering ceramics can prolong ...

AI Technical Summary

Problems solved by technology

The characteristics of laser-assisted heating technology limit the use of coolant, and it is impossible to fundamentally eliminate surface / subsurface cracks caused by heat accumulation

Cracks will reduce the wear resistance of the surface of alumina engineering ceramics, increase the sensitivity of stress corrosion, and reduce the fatigue resistance, thereby greatly reducing the service life and reliability of engineering ceramic parts

[0010] At present, no one in China has studied the laser-induced thermal cracking grinding of alumina engineering ceramics. An important technical problem worth discussing in the research of aluminum ceramic processing

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