芳纶纤维增强复合材料的微铣削与铣磨精加工

Micro-milling and Grinding Finishing Process of Aramid Fiber Reinforced Polymer

芳纶纤维增强复合材料极难加工,且材料本身具有各向异性,因此其在加工后表面质量并不理想,常会出现分层、烧焦、拉毛等缺陷。针对上述问题,本研究对芳纶纤维增强复合材料分别进行了微铣削和铣磨试验,对比分析了两种加工试样的表面粗糙度和微观形貌以及两种工艺的切削机理。结果表明:微铣削加工后表面粗糙度随着进给速度的增加呈现先增后减的趋势;铣磨加工后表面粗糙度随进给速度的增加而增大,且远大于微铣削的表面粗糙度。试验发现,微铣削加工中拉毛现象明显;而铣磨加工表面存在大量白色凝结物,通过在加工过程中引入风冷工艺可有效减少凝结物的生成,从而有效地提高表面质量。

A ramid fiber reinforced polymer is an extremely difficult material to be processed.Due to the anisotropy of the material,it often causes defects such as stratification,burning and burr when it is processed in a general manner.In view of the above problems,the micro-milling and grin-ding experiments were carried out respectively.The cutting mechanism of the two processes was analyzed,and the surface roughness and micro-morphology of the two samples were compared.The results show that the surface roughness after micro-milling increases first and then decreases with the increase of feed rate.The surface roughness of grinding increases with the increase of feed rate,which is much higher than that of micro-milling.It is found that the burr phenomenon in the micro-milling process is obvious,and there is a large amount of white condensation on the surface of grinding process.The formation of condensate can be reduced and surface quality can be improved effectively by introducing an air-cooling process during the processing.