摘要
基于材料塑性滑移理论与刀具刃前材料流动状态分析,提出了一种考虑倒棱刀具负前角切削过程下的材料滞流区(死区)和预剪区的修正滑移线场模型,并给出了材料流动剪切应力和刃前切削几何参数的迭代求解方法,揭示了倒棱刃口几何形状与滑移线场几何参数之间的变化规律。将此模型应用于倒棱刀具切削过程,得到了适用于倒棱刀具正交切削力的预测方法。采用有限元仿真和切削试验相结合的方法对所提出的滑移线场模型和切削力预测方法分别进行了验证,模型预测结果与仿真结果和试验测量结果对比误差均在10%以内。研究结果为研究倒棱几何形状对工件材料流动特性和刀具切削性能的影响提供了参考。
Based on the material plasticity slip-line theory and flow state analysis ahead of tool edge,a modified slip-line field model was proposed considering material stagnation zone(dead metal zone),and pre-cut region in negative-rake-angle cutting processes with chamfered insert.Furthermore,an iterative sollution to material shear flow stress and edge front cutting geometry was suggested.The relationships of chamfered edge geometry and slip-line field geometry were disclosed.An analytical approach to the orthogonal cutting force prediction method was developed by applying the presented model to the cutting processes with chamfered insert.Verifications including finite element simulations and orthogonal cutting trials were carried out for the modified slip-line field model and prediction method of cutting forces.Average errors are all less than 10%in comparisons of predictions and simulations as well as measurements.Results provide references for investigating the influences of edge geometries on material flow characteristics and tool cutting performances.
作者
庄可佳
胡诚
代星
浦栋麟
丁汉
ZHUANG Kejia;HU Cheng;DAI Xing;PU Donglin;DING Han(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan,430070;Hubei Digital Manufacturing Key Laboratory,Wuhan University of Technology,Wuhan,430070;State Key Laboratory of Digital Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan,430074;Wuxi Research Institute of Huazhong University of Science and Technology,Wuxi,Jiangsu,214000)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2021年第8期890-900,共11页
China Mechanical Engineering
基金
国家自然科学基金(51705385,51975237)
装备预研领域基金(61400020108)。
关键词
滑移线场
倒棱刃口
死区
切削力预测
slip-line field
chamfered edge
dead metal zone
cutting force prediction
