基于刃磨工艺的超硬刀具复合倒棱仿真与实验分析  

Simulation and experimental analysis of composite chamfering of superhard cutting tools based on edge grinding technology

作　　者：李鹤 石广丰[1] 吕红兵 杨永明 李胜 朱立春 LI He;SHI Guangfeng;LV Hongbing;YANG Yongming;LI Sheng;ZHU Lichun(School of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun 130022,China;Jilin Jiuyuan Baina Steel Processing Co.,Ltd.,Changchun 130022,China)

机构地区：[1]长春理工大学机电工程学院,长春130022 [2]吉林省九源百纳钢材加工有限公司,长春130022

出　　处：《金刚石与磨料磨具工程》2024年第5期632-643,共12页Diamond & Abrasives Engineering

基　　金：吉林省科技厅自然科学基金(20240101078JC);长春理工大学露泉创新基金。

摘　　要：为了改善圆弧刃倒棱聚晶金刚石(poly crystalline diamond,PCD)车刀加工有色金属的光亮程度,特在圆弧刃倒棱车刀基础上进行二次倒棱处理,使其形成复合倒棱结构。在CATIA软件中根据COBORN RG9磨床实际刃磨PCD倒棱刀具的工艺,建立圆柱形后刀面复合倒棱车刀三维模型,使用Deform V11.0软件进行PCD复合倒棱车刀的三维切削仿真分析,并根据仿真分析结果进行PCD复合倒棱车刀与PCD一阶倒棱车刀的切削实验对比。结果表明:复合倒棱结构只在较大的切削深度时才有提升工件光亮度的作用;在相同切削深度下,PCD复合倒棱车刀的切削温度小于PCD一阶倒棱车刀的;在切削深度为0.14 mm时,随着切削时间增加,PCD复合倒棱车刀加工零件的表面粗糙度要小于PCD一阶倒棱车刀的。结合PCD刀具的最终磨损状态发现,PCD复合倒棱车刀对切削后工件的捋平效果更佳,工件的光亮度更高,其抗磨损性能更好。Objectives:Circular edge chamfering PCD turning tools often feature a chamfered surface at the cutting edge to enhance tool durability.However,the arc at the tool tip causes a large amount of chip accumulation in front of the tool,making chip discharge difficult.This leads to increased cutting temperatures,accelerated tool wear,and reduced surface brightness of the workpiece.To improve the brightness of circular edge chamfering PCD turning tools when processing non-ferrous metals and enhance the tool's durability,a composite chamfering structure is created by performing secondary chamfering on the basis of the circular edge chamfering tool.Methods:Using CATIA software and based on the actual grinding process of the PCD chamfering tool by the COBORN RG9 grinder,the grinding wheel is positioned at different points along the tool's moving path using the trajectory discrete envelope method.The unma-chined tool is enveloped,and the overlap between the grinding wheel and the tool is removed,resulting in a three-di-mensional approximate model of the composite chamfering tool.By extracting point coordinates,performing curve fit-ting,surface fitting,surface joining,and other methods,a three-dimensional model of the composite chamfering tool with a cylindrical back surface is established.Deform V11.0 software is then used to simulate the 3D cutting of the PCD composite chamfering tool,calculating the root-mean-square value of the cutting force and the mean cutting temperat-ure under different cutting depths and second-order chamfering widths,as well as under different cutting depths and second-order chamfering angles.The analysis focuses on selecting the second-order chamfering width for different cut-ting depths when the first-order chamfering width is fixed,and choosing the second-order chamfering angle for differ-ent cutting depths when the second-order chamfering width is fixed.Based on this analysis,the effects of different in-clination angles on the machining performance of the composite chamfering tool−such as chi

关 键 词：PCD车刀 切削深度 表面粗糙度 刀具磨损 

分 类 号：TG71[金属学及工艺—刀具与模具] TG58[化学工程—高温制品工业] TQ164