摘要
针对微织构刀具加工过程中的衍生切削效应,利用正交微切削单元开展了微坑刀具及无织构刀具的钛合金微切削实验,从切屑底面形貌、微坑黏结状态等方面分析了微坑刀具微切削性能;通过ABAQUS软件对微织构刀具微切削钛合金过程进行有限元模拟,分析微坑织构的衍生切削作用对刀-屑接触应力分布及切削力的影响,优化设计微坑边缘过渡区参数并进行切削仿真分析。实验和仿真结果表明,微坑会减小前刀面黏结,存储微屑,减小刀-屑接触应力,提高刀具减摩性能;但微坑与切屑的衍生切削作用会增大瞬时切削力,降低切削过程平稳性。此外,微坑过渡区优化可改善切削过程波动,降低切削力,改变切屑形态,改善切屑在微坑的流入/流出状态,有助于减小微坑织构衍生切削效应,提高织构的减摩效果。
Aiming at the derivative cutting effect in cutting process of micro texture tool,micro cutting experiment of micro pits tool and untextured tool is carried out by orthogonal micro cutting unit.The micro cutting performance of micro pits tool is analyzed by the experiment on chip bottom morphology,the adhesion status.The process of micro cutting titanium alloy with micro texture tools is simulated by ABAQUS.The influence of the derivative cutting of pit texture on the distribution of chip contact stress and the cutting force is analyzed by the simulation.Meanwhile,the transition zone parameters of the edge of the micro pits are optimized and designed,and the simulation analysis is carried out for the optimized model.The experimental and simulation results show that the micro pits can reduce adhesion of rake face,store the microchips and reduce the contact stress between the tool and chip,and also improve the antifriction performance of the tool.However,the derivative cutting effect of micro pits can increase the instantaneous cutting force and reduce the stability of the cutting process.In addition,the optimization of micro pits transition zone can improve the fluctuation of cutting force,reduce cutting force,change chip shape,and improve chip inflow and outflow state in micro pits,which is benefit for reducing derivative cutting effect and improve the friction reduction of micro textures.
作者
刘佳
于化东
于占江
蔡倩倩
许金凯
李一全
Liu Jia;Yu Huadong;Yu Zhanjiang;Cai Qianqian;Xu Jinkai;Li Yiquan(Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing of Changchun University of Science and Technology,Changchun 130022,China;不详)
出处
《工具技术》
北大核心
2021年第9期47-53,共7页
Tool Engineering
基金
国家重点研究发展计划(2018YFB1107403)
中国“111”(D17017)
吉林省科技发展计划(20190101005JH,20180201057GX,20190302076GX)
长春理工大学青年科学基金(XQNJJ-2018-09)。
关键词
衍生切削
微织构
钛合金
微切削
切削仿真
derivative cutting
micro texture
Ti6Al4V
micro cutting
cutting simulation
