基于细观模型的刃口半径对CFRP铣削过程影响  

Influence of Cutting Edge Radius on CFRP Milling Process Based on Micro-Simulation

作　　者：武卫洲 刘雪峰 崔鑫 赵尔华 秦旭达[1] 李士鹏[1] WU Weizhou;LIU Xuefeng;CUI Xin;ZHAO Erhua;QIN Xuda;LI Shipeng(Tianjin University,Tianjin 300000,China;Tianjin Long March Launch Vehicle Manufacturing Co.,Ltd.,Tianjin 300000,China;Captial Aerospace Machinery Corporation Limited,Beijing 100076,China)

机构地区：[1]天津大学,天津300000 [2]天津航天长征火箭制造有限公司,天津300000 [3]首都航天机械有限公司,北京100076

出　　处：《航空制造技术》2022年第22期60-67,共8页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(52075380);天津市自然科学基金(21JCYBJC00610)。

摘　　要：刀具刃口半径是影响碳纤维增强树脂基复合材料(CFRP)加工质量的重要因素。为了研究刃口半径对CFRP铣削过程中切削机理的影响规律,建立了二维细观仿真模型,通过试验验证了其准确性。使用该模型分析了不同刃口半径情况下切削力、材料去除过程、面下损伤的变化规律。结果表明,纤维方向角对切削力的影响要大于刃口半径,纤维方向角为45°时,切削力随着刃口半径变大而增大,其他纤维方向角下切削力随刃口半径变化波动较小。随着刃口半径增大,CFRP切削过程由主要是剪切失效转为主要是弯曲失效。刃口半径越小对应面下损伤深度越小,切削力越小,但是会导致刃口处应力过大,有崩刃危险。The cutting edge radius is an important factor affecting the machining quality of carbon fiber reinforced polymers(CFRP).In order to study the influence of cutting edge radius on cutting mechanism in CFRP milling process,a two-dimensional micro simulation model was established.The accuracy of the cutting model was verified by comparing the cutting force obtained from the experiment with the simulation value.Using this model,the changing rules of cutting force,cutting mechanism and subsurface damage under different cutting edge radius were analyzed.The results show that the influence of fiber orientation on cutting force is greater than that of cutting edge radius.When the fiber orientation is 45°,the cutting force increases with the increase of edge radius,but fluctuates less at the other fiber direction angles with the change of edge radius.With the increase of the cutting edge radius,the cutting process of CFRP changes from shear failure to bending failure.Small cutting edge radius causes small subsurface damage depth and small cutting force.However,it will lead to excessive stress at the edge,and there is a risk of tipping.

关 键 词：CFRP 细观仿真 刃口半径 切削机理 面下损伤 纤维方向角 

分 类 号：V261.23[航空宇航科学与技术—航空宇航制造工程]