摘要
半刀宽插铣是一种常见的型腔加工方式,在顺铣切入和逆铣切出时由于刀—屑接触宽度突变会产生较大冲击,严重影响刀具使用寿命。通过有限元计算与实验相结合的方式,对半刀宽逆铣加工中的冲击力学行为进行研究。以40Cr合金钢为研究对象,建立半刀宽逆铣有限元计算模型,根据加工中刀—屑接触宽度与切削力的变化特点,以刀—屑接触宽度发生突变对应时刻的切向力表征冲击力,采用极差分析法与单因素分析法研究各切削参数对刀具冲击力的影响规律,并通过实验验证了模型的有效性。实验结果表明,仿真与实验冲击力的相对误差在10%以内,证明该有限元模型可用于半刀宽插铣冲击力预测和切削参数优化;冲击力与插铣步距和每齿进给量成正比,随着切削速度的增加,冲击力先增加后减小。
Half-wide plunge milling is a typical cavity machining method,in the process of cut-in and cut-out,the sudden change of tool-chip contact width will cause a large impact force,which will cause premature failure of the tool.By combining finite element simulation and tests,impact force in half-wide plunge milling is studied.Taking 40Cr alloy steel as the research object,finite element model for half-wide plunge milling is established,impact force is characterized by the tangential force at the moment corresponding to the abrupt change in tool-chip contact width.The effect law of each cutting parameter on tool impact force is studied by using extreme difference analysis and single factor analysis,and the validity of the model is verified by experiment.Experimental results show that the relative error of impact force of simulation and experiment is within 10%,the finite element calculation model can be used for impact force prediction and cutting parameter optimization in half-wide plunge milling.The impact force is proportional to the interpolation step and the feed per tooth,and increases and then decreases with the increase of cutting speed.
作者
李红霞
李国志
魏兆成
郭明龙
王学勤
Li Hongxia;Li Guozhi;Wei Zhaocheng;Guo Minglong;Wang Xueqin(College of Mechanical Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;不详)
出处
《工具技术》
北大核心
2024年第4期64-69,共6页
Tool Engineering
基金
国家自然科学基金(52075076)。
关键词
半刀宽插铣
刀—屑接触宽度
有限元
实验
冲击力
half-wide plunge milling
tool-chip contact width
finite element
test
impact force
