摘要
通过正十二边形磨削轨迹测试方法研究了单向C/SiC的磨削力和加工表面质量的影响机制.研究发现,相较于顺磨,逆磨的切向磨削力减小10％～25％,法向磨削力减小30％～50％,表面粗糙度减小25％～65％;纤维磨削角对磨削特性具有显著影响,顺纤维磨削时,磨削力由大到小的纤维磨削角排序为60°、30°、90°、0°,逆纤维磨削时的排序为120°、90°、150°、180°;加工表面粗糙度Sa由大到小的纤维磨削角排序为0°、150°、120°、30°、60°、90°;C/SiC磨削加工时,材料的变形回弹效应较明显.对比了不同纤维磨削角下的表面微观形貌,提出了磨削材料去除模型.
Abstract
This paper investigated the impact mechanism of grinding forces and machined surface quality on unidirectional C/SiC by a regular dodecagon-based grinding track method.Comparative analysis reveal that up grinding reduces tangential forces by 10％～25％,normal forces by 30％～50％,and surface roughness by 25％～65％,compared to down grinding.Moreover,the fiber grind-ing angle has a pronounced impact on the grinding characteristics.When the fiber grinding angle is as 0°～90°,the magnitude ranking of grinding force from large to small is as 60°,30°,90°,0°.When the fiber grinding angle is as 90°～180°,the magnitude ranking of grinding force from large to small is as 120°,90°,150°,180°.The order of surface roughness Sa on the machined surface aligns with the grinding force magnitude ranking as 0°,150°,120°,30°,60°,90°.A pronounced material deformation rebound effectiveness is observed in C/SiC grinding.A comparative analysis of surface microstructures at diverse fiber grinding angles,and a grinding material removal model was introduced.
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