Precision grinding of silicon nitride ceramic with laser macro-structured diamond wheels

•Precision grinding of silicon nitride ceramic was effective under LMSG conditions.•The grinding forces and grinding temperature decreased significantly.•Probability of ductile removal increased under LMSG conditions.•Structured pattern geometry produced great impact on the surface generation. Silic...

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Bibliographic Details
Published in:Optics and laser technology 2019-01, Vol.109, p.418-428
Main Authors: Zhang, Xiaohong, Zhang, Zhicheng, Deng, Zhaohui, Li, Si, Wu, Qiaoping, Kang, Zhongxiong
Format: Article
Language:English
Subjects:
Ceramics
Diamond machining
Diamonds
Grinding
Grinding force
Grinding temperature
Grinding tools
Grinding wheels
Laser macro-structured
Lasers
Machinability
Pulsed lasers
Silicon nitride
Subsurface damage
Surface roughness
Wear
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Summary:•Precision grinding of silicon nitride ceramic was effective under LMSG conditions.•The grinding forces and grinding temperature decreased significantly.•Probability of ductile removal increased under LMSG conditions.•Structured pattern geometry produced great impact on the surface generation. Silicon nitride ceramics are extremely difficult and time-consuming to machine with conventional methods due to high strength and hardness. Laser-assisted machining has been a field of extensive research during the past decade, as it is a promising solution to enhance the machinability of many difficult-to-cut materials, including silicon nitride ceramics. To enhance the processing precision of silicon nitride ceramic grinding, in this work a laser macro-structured method using pulsed laser is proposed and applied to produce certain macro patterns on the surface of diamond grinding wheel. Grinding performance of the macro-structured grinding wheel is tested and compared with a non-structured grinding wheel. It is found that the laser structured pattern has a strong influence on the grinding characteristics. The normal and tangential grinding forces for laser macro-structured grinding (LMSG) condition are 16.3% (15.1%) lower than that in the conventional grinding (CG) condition. The grinding temperature and subsurface damage decrease significantly for LMSG condition. However, due to the influence of pattern geometry, the improvement for surface roughness is not obvious. The groove wear does not reveal a significant increase in wear of the structured grinding wheel.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.08.021