摘要
为研究非对称织构对刀具的切削性能及其对衍生切削的影响,基于Johnson-Cook模型,利用有限元分别进行无织构刀具(NT)、正向非对称织构刀具(FT)和反向非对称织构刀具(RT)切削45钢的仿真分析,并进行相应的切削实验,对比分析了 NT、FT和RT的切削力、切削温度、切屑形态、衍生切削和刀具磨损等.研究发现非对称织构刀具的切削性能要优于无织构刀具,但织构的存在同时会诱发衍生切削现象,对切削性能产生一定的负面影响,加剧刀具磨损.NT、RT和FT的平均主切削力分别为601.9、196.4和419.1 N,织构刀具的切削力较无织构刀具减少了约30.4％～67.4％.结果表明,引入织构后有利于增大剪切角、降低切削力、改善刀尖温度分布和减少切屑的黏附,提高切削稳定性;但织构诱发的衍生切削会加剧织构在切屑流出端的刀面磨损,会在一定程度上影响切削温度、增大切削力,织构与衍生切削的耦合作用使得RT的切削性能优于FT.
Abstract
To study the cutting performance of the internal structure asymmetric microtexture on the tool and its influence on the derivative cutting,based on the Johnson-Cook model,the finite element was used to simulate and analyze the cutting 45# steel of Non-woven Tool(NT),Forward asymmetric microtexture Tool(FT),and Reverse asymmetric microtexture Tool(RT),and the corresponding cutting experiments were carried out,and the cutting force,cutting temperature,chip morphology,derivative cutting and tool wear of NT,FT,and RT were compared and analyzed.it is found that the cutting performance of internal structure asym-metric microtexture tools is better than that of non-woven tools,but the existence of texture will also induce derivative cutting phe-nomenon,which will have a certain negative impact on cutting performance and aggravate tool wear.The average main cutting forces of NT,RT,and FT are 601.9,196.4 and 419.1 N,respectively,and the cutting force of microtexture tools is reduced by a-bout 30.4％～67.4％compared with non-woven tools.The results show that the introduction of microtexture is conducive to re-ducing the shear angle,reducing the cutting force,improving the temperature distribution of the tooltip,reducing the adhesion of chips,and improving the cutting stability.However,the microtexture-induced derivative cutting will aggravate the wear of the cut-ter surface near the microtexture,which will affect the cutting temperature to a certain extent,increase the cutting force,and the coupling effect of microtexture and derivative cutting makes the cutting performance of RT greater than that of FT.
维普
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