考虑微刃口几何的Ti-6Al-4V钛合金加工切削力仿真预测与试验研究  

Experimental and FEM Study on Cutting Process of Ti-6Al-4V Alloy Titanium Concerning Tool Cutting Edge Microgeometry

作　　者：刘超 陈亮 代星 胡诚 庄可佳[3] Liu Chao;Chen Liang;Dai Xing;Hu Cheng;Zhuang Kejia(AECC South Industry Company Limited,Zhuzhou,Hunan 412001,China;不详)

机构地区：[1]中国航发南方工业有限公司 [2]华中科技大学无锡研究院 [3]武汉理工大学

出　　处：《工具技术》2024年第2期15-21,共7页Tool Engineering

摘　　要：切削刀具刃口半径对材料加工过程有着重要影响,其中如切削力、切削应力以及刀—屑交界面的温度分布,这些参数最终都会作用在刀具寿命和工件已加工表面完整性上。刀具刃口圆形钝化处理能够使刀具不易在切削过程中出现崩刃。本研究借助有限元方法对钝圆刃口刀具切削过程进行深入研究,其中有限元模型采用耦合欧拉—拉格朗日(Coupled Eulerian Lagrangian,CEL)方法建立。为研究刀具刃口对切削过程影响,本研究的切削工况包括四种刀具刃口半径(10μm,20μm,30μm,40μm)和三种未变形切屑厚度(0.1mm,0.15mm,0.2mm),对12种工况分别进行仿真和试验研究,验证所提出的有限元模型的准确性和合理性。在此基础上,进一步对仿真结果中的切削温度、切削应力和材料流动状态等过程量进行深入分析研究发现,随着刀具刃口半径的增加,两向切削力的刃前切削应力和最高切削温度都呈增长趋势,最高切削温度由前刀面向后刀面移动。本研究或为钛合金切削过程的机理理解及难加工材料刀具和切削参数设计提供支持。The cutting tool edge radius has a major influence on the material machining process.Cutting process variables such as cutting force,cutting stress and temperature distribution at the tool-chip interface,can ultimately have an effect on tool life and the integrity of the machined surface of the workpiece.The rounding passivation treatment of the cutting edge can make the tool less prone to chipping during the cutting process.In this study,the finite element method(FEM)is used to conduct an in-depth study of the cutting process of the rounded-edge tool.The finite element model is established by the Coupled Eulerian Lagrangian(CEL)method.In order to study the influence of the tool edge on the cutting process,the cutting conditions in this study include four tool edge radii(10μm,20μm,30μm,40μm)and three undeformed chip thicknesses(UCT:0.1mm,0.15mm,0.2mm),the 12 kinds of working conditions are then simulated and experimentally studied to verify the accuracy and rationality of the proposed finite element model.On the basis of this verification,the process quantities such as cutting temperature,cutting stress and material flow state in the simulation results are further analyzed.The temperature all showed an increasing trend,and the highest cutting temperature appeared to move from the rake face to the flank face.This research may provide support for the mechanism understanding of the titanium alloy cutting process and the design of tools and cutting parameters for difficult-to-machine materials.

关 键 词：钛合金 切削加工 有限元仿真 钝圆刃口 

分 类 号：TG136.4[一般工业技术—材料科学与工程] TH161[金属学及工艺—合金] V261.23[金属学及工艺—金属学]