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

An engineering ceramics, laser-induced technology, applied in the field of grinding processing, can solve the problem of reducing the service life and working reliability of engineering ceramics parts, unable to fundamentally eliminate surface/subsurface cracks, and reducing the wear resistance of alumina engineering ceramics surfaces. and other problems, to achieve the effect of being beneficial to the surface quality, reducing the processing cost and reducing the grinding force

Inactive Publication Date: 2014-06-04
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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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

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

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Embodiment Construction

[0033] The following will be combined with Figure 1-6 The present invention is further described.

[0034] In view of the fact that cracks will reduce the wear resistance of the surface of alumina engineering ceramics, the present invention adopts a reverse thinking method and proposes a method of actively introducing thermal cracks to reduce the wear resistance of alumina engineering ceramics, that is, the laser-induced thermal cracking grinding method. The method specifically includes the following steps:

[0035] The first step is to induce thermal cracks on the surface of alumina engineering ceramics by low-power laser radiation, and reasonably control the expansion of cracks;

[0036] In the second step, the thermal crack layer on the surface of the alumina engineering ceramics is ground in a wet grinding state.

[0037] Since the properties of alumina ceramic materials have a great influence on the processing mechanism of laser-induced thermal cracking grinding, in th...

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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 ...

Claims

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Application Information

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IPC IPC(8): B24B1/00
CPCB23K26/0093B23K26/0006B23K26/0643B23K2103/52
Inventor 张晓红安伟科陈根余邓朝晖周志雄
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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