Research On Precision Turning Performance And Residual Stress Analysis Of AM60 Magnesium Alloy

Magnesium alloys are widely used in aerospace,national defense,military,biological engineering,Microelectronic Engineering and other industries as a new type of materials.However,with the increasing demand for the quality and accuracy of their workpieces,the demand for precise/ultra-precise processing of magnesium alloys is becoming increasingly urgent.Nowadays,the processing of magnesium alloys in factories often relies on the experience of processing aluminium alloys or previous processing experience to select cutting parameters,but the performance and surface morphology of the workpiece are often not satisfied,and the parts with higher precision are experimented to obtain the reasonable parameters of the batch of parts,which can not meet the needs of other precise parts of magnesium alloys.Starting with the discussion of the source and background of the subject,and through the analysis of the current research situation at home and abroad,this paper determines the research content and significance of AM60 magnesium alloy precision turning,and finally determines the technical route and structure of the paper.Firstly,the numerical simulation of AM60 magnesium alloy precision cutting process is studied,and two-dimensional and three-dimensional simulation turning model is established.The influence of cutting parameters and tool parameters on cutting temperature,cutting force,chip and residual stress distribution are elaborated in detail.Secondly,based on the analysis of precision cutting simulation process,the cutting theoretical model is established and the main shear surface is studied.Based on the constitutive equation,the relationship between cutting temperature,strain and shear angle,the minimum depth model is established and verified by scanning the chip surface.Finally,the linear regression analysis method is used to carry out experimental research,and the problems encountered in turning are analyzed.The surface morphology and residual stress of the machined workpiece are studied,and the influence of cutting parameters on the surface morphology and residual stress is summarized.