钻削参数对碳纤维复合材料钻孔质量的分析

Analysis of drilling parameters on drilling quality of carbon fiber reinforced plastics

碳纤维复合材料(CFRP)由于其层间强度低,各向异性等特点,极易出现加工损伤,而钻削参数的选取,对钻孔质量有着很大的影响。利用有限元软件建立钻削T300碳纤维复合材料仿真模型,选择不同切削用量进行钻削加工仿真,分析切屑及其形成原因。采用正交试验法进行钻削加工试验,将得到的钻孔毛刺、撕裂、分层损伤和孔壁损伤等几种损伤试验结果,与仿真结果进行对比验证并分析其产生原因。结果表明:对T300碳纤维复合材料钻孔时,孔出口处撕裂缺陷远大于孔入口处缺陷,即入口处钻孔质量要好于出口处钻孔质量。对孔出、入口处撕裂值影响程度最大的是钻头直径,切削速度次之,进给量影响最小;而对孔径尺寸误差影响最大的是钻头直径,进给量次之,切削速度影响最小。

Carbon fiber reinforced plastics(CFRP)have the characteristics of low interlayer strength and complex anisotropy,which are prone to machining damage.The selection of cutting parameters has a great influence on the quality of drilling.The finite element software was used to establish a machining simulation model for drilling T300 carbon fiber reinforced plastics,and different cutting parameters were selected for drilling simulation,and the chips and their formation reasons were analyzed.Orthogonal test method is selected for drilling processing test.The obtained damage test results such as burr,tearing,delamination damage and hole wall damage are compared with the simulation results to verify and analyze their causes.The results show that when drilling the T300 carbon fiber composite the tear defects at the exit of the hole are much larger than those at the entrance of the hole.That is,the quality of the entrance drilling is better than that of the exit drilling.The largest impact on the exit and the entrance tear value is the diameter of the drill bit,the cutting speed is the second,and the feed rate has the least effect.However,the diameter of the drill bit has the greatest influence on the hole size error,followed by the feed rate,and the cutting speed has the least effect.