Design Criteria And Experimental Investigation On Micro Textures Of YG8 Ball End Milling Cutter For Cutting Titanium Alloy

Titanium alloys are widely used in aerospace,medical,automobile and other fields for their excellent mechanical properties,corrosion resistance and high temperature oxidation resistance.However,titanium alloys are a typical refractory material,and the cutting of them is much more difficult than that of conventional material.The insertion of micro-texture on the rake face can reduce the cutter-chip contact area,then reduce friction in order to play an role of anti-wear and antifriction.In order to improve the cutting performance of carbide ball-end milling cutter,the influence of micro-texture parameters on cutting temperature,cutting force,cutter wear and workpiece surface roughness were studied.Mathematical model was established by regression analysis.Based on the evaluation criterion of cutting performance of carbide micro-texture ball-end milling cutter,genetic algorithm was applied in multi-objective optimization of micro-texture parameters.Mathematical model of micro-texture design criteria was established.Firstly,the anti-wear and anti-friction mechanism of micro-texture was analyzed theoretically,and the effective area of micro texture is expounded in the view of geometry,and the preparation process of micro-texture cutter was designed.In order to study the influence of cutting parameters on the cutting performance of cemented carbide micro textured ball-end milling cutter,the simulation experiments of cutting titanium alloys with different cutting parameters were carried out.The influence of cutting parameters on cutting temperature and cutting force was analyzed,and the experimental verification of cutting titanium alloys with cemented carbide micro texture ball-end milling cutter was carried out.The cutting parameters were optimized by considering the cutting force,cutting temperature and processing rate,which laid a foundation for the next research.Then,the test data of cutting temperature,cutting force,cutter wear and machined surface roughness were obtained by simulating and experiment with the cutting titanium alloy of cemented carbide micro-texture ball-end milling cutter under different micro-texture parameters.The effects of micro-texture parameters on cutting temperature,cutting force,tool wear and machined surface roughness were studied respectively,which provided a basic research for the design criteria of microtexture for cemented carbide ball-end milling cutters.Finally,the quantitative model of micro-texture was designed.The multivariate regression mathematical models of cutting temperature,cutting force,tool wear and workpiece surface roughness were established by taking the diameters,pit depths,spacing and distance from the edge as variables.The corresponding quantitative evaluation criteria were established.Taking the cutting performance of cemented carbide micro-texture ball-end milling cutter as the evaluation criterion,multiobjective optimization of micro-texture parameters was carried out by genetic algorithm,and the design criterion of micro-texture was put forward.