刃口钝圆半径对SiC_(p)/Al复合材料铣削表面质量和切屑形貌影响研究  

Study on The Influence of The Cutting Edge Radius on The Milling Surface Quality and Chip Morphology of SiC_(p)/Al Composites

作　　者：高航 牛秋林[1] 戎杰 邱新义[1] 李鹏南[1] GAO Hang;NIU Qiulin;RONG Jie;QIU Xinyi;Li Pengnan(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201

出　　处：《宇航材料工艺》2024年第5期50-57,共8页Aerospace Materials & Technology

基　　金：国家自然科学基金(52075168、51605161);湖南科技大学科学研究基金(KJ-2042)。

摘　　要：碳化硅颗粒增强铝基复合材料(SiC_(p)/Al)具有卓越的物理力学性能,广泛应用于航空航天、电子、军事等高端领域。本文以体积分数为20%的SiC_(p)/Al复合材料为研究对象,采用单因素试验方法进行干式铣削,分析刀具刃口钝圆半径和切削速度对切削力、表面形貌、表面粗糙度(Ra)和切屑形貌的影响。结果表明:切削力随着刃口钝圆半径的增加而降低,随着切削速度的增加先降低后增加;随着刃口钝圆半径的增加,加工表面的凹坑和犁沟缺陷减少,表面Ra呈降低趋势。随着切削速度的增加,加工表面的划痕缺陷增多,表面Ra呈现先增加后降低的趋势;在不同刃口钝圆半径和不同切削速度下,切屑形状均呈不规则锯齿状。切屑非自由表面微观形貌随着刃口钝圆半径的增加逐渐变得光滑,随着切削速度的增加出现更严重的裂纹。SiC particle reinforced aluminum matrix composites(SiC_(p)/Al)had excellent physical and mechanical properties and were widely used in aerospace,electronics,military and other high-end fields.In this paper,SiC_(p)/Al composites with a volume fraction of 20%were taken as the research object,and the dry milling test was carried out by using the single factor test method.The effects of the cutting edge radius and the cutting speed on the cutting force,surface morphology,surface roughness(Ra)and chip morphology were analyzed.The results show that the cutting force decreases with the increase of the cutting edge radius,and decreases first and then increases with the increase of the cutting speed.With the increase of the cutting edge radius,the pits and furrows on the machined surface decrease,and the Ra tends to decrease.With the increase of cutting speed,the scratch defects on the machined surface increase,and the Ra increases first and then decreases;Under different cutting edge radius and different cutting speed,the chip shapes appear irregular sawtooth.The micro morphology of non free surface of the chip gradually becomes smooth with the increase of the cutting edge radius,and more serious cracks appear with the increase of the cutting speed.

关 键 词：SiC_(p)/Al复合材料 刃口钝圆半径 切削速度 表面质量 

分 类 号：TG506.7[金属学及工艺—金属切削加工及机床]