Coated Cutting Tool Matching And Cutting Parameter Optimization Of P20 Steel

With the development of the automotive industry,electronic industry,machinery industry,the demand for molds is increasing,and the market competition is fierce due to the short life cycle of the molds.Therefore,improving mold production efficiency is the primary goal of the mold industry.In this paper,for the milling of P20 steel,the research of rough milling coated cutting tool matching and tool wear was carried out;and the modeling of finish-milling surface topography and the optimization of finishing parameters were studied.The main research contents are as follows:(1)The matching study between the coated cutting tool and the P20 was carried out.Firstly,10 different brands of coated cutting tools were selected and the coating element diffusion experiment was carried out.The resistance of Ti loss of these 10 tools was compared.By comparison,it was found that the tool with Al2O3 coating can enffectively prevent the loss of titanium from tool to workpiece;secondly,through the physical and mechanical analysis of the coating,it was found that TiAIN coating and TiN-TiAIN coating tools is also suitable processing P20.(2)The research on the wear of cutting tools in P20 steel rough milling was carried out.Firstly,according to the actual processing experience of the manufactory and the cutting tools price,the tool selection range was reduced.Four kinds of coated tools were selected and the milling experiment was carried out.The wear curve of the coated tool was plotted,and the most wear resistant coated tool had been selected;after that,based on the Taylor formula,the rapid experiment method was used,and the milling experiment was continued by using the coated tool,and the vc-T mathematical relationship of the rough milling P20 steel was obtained.It provided a theoretical basis for manufactory to reasonably choose cutting speed and control production costs.(3)The surface morphology models of ball-end milling and bull-nosed end milling were established,and the parameters of P20 mold steel finish-milling were optimized.Firstly,combined with the tool rotation transformation matrix,the translation motion matrix,the tool posture transformation matrix,and the blade curve equations,the surface topography was established.On the other hand,this paper established the mathematical expression of the arithmetic mean deviation of the surface contour of ball-end milling and bull-nosed end milling by analyzing the geometry of the surface residue after finish-milling;then the multi-objective genetic algorithm was used to optimize the parameters,it provided a parameter selection method for the manufactory.In this paper,coated tools matching and rough milling tool life mathematical model can help to choose coated tools and control production costs.The surface morphology models and the multi-objective optimization of cutting parameters is benefit to choose the optimal cutting parameters in order to give consideration to both machining quality and cutting efficiency.