Research On Micro-texture Distribution Design And Anti-wear And Anti-friction Mechanism Of Ball-end Milling Cutter

Titanium alloy is often used in aerospace,chemical industry,medical equipment and other fields because of its many excellent characteristics,and is called future metal.However,titanium alloy,as a difficult material to machine,is difficult to cut and has low machining efficiency,which leads to its limited application.In recent years,bionics studies have shown that microstructure similar to animal epidermis and plant surface can reduce friction,and some studies have shown that combining microstructure with cutting tools can effectively improve cutting performance of cutting tools.Therefore,this paper takes cemented carbide ball-end milling cutter as the research object,prepares micro-texture with variable distribution density on the tool rake face,studies the influence of micro-texture distribution density on the anti-wear and anti-friction performance of ball-end milling cutter,and reveals its action mechanism from the micro level.Firstly,according to the different contact forms between tool and chip,it is divided into two parts: bonding area and slip area,and the friction coefficient model of tool-chip contact area and the mathematical model of micro-texture distribution are established Based on the comparative analysis of finite element simulation of textured and non-textured tools,the influence of micro-texture on the stress at the cutting edge of tools is studied Through titanium alloy milling experiment,the influence of micro-texture on tool wear is studied Based on the detection results of element content in the tool-chip contact area,the anti-friction performance of micro-textured ball-end milling cutter is analyzed,and the theoretical model of anti-wear and anti-friction of micro-textured tool is established.It lays a theoretical foundation for studying the anti-wear and antifriction mechanism of micro-texture ball-end milling cutter with variable distribution density.Secondly,micro-texture with variable distribution density is prepared on the rake face of ball-end milling cutter by laser equipment;Based on energy spectrum analysis technology,the cobalt content in micro-texture area after laser machining is analyzed,and the influence of micro-texture with different distribution density on cobalt content on tool surface is studied The experimental platform for milling titanium alloy with variable distribution density micro-texture ball-end milling cutter is set up to study the influence of micro-texture parameters on milling force Based on the detection results of titanium distribution in the knife-chip contact area by scanning electron microscope,the influence of micro-texture parameters with variable distribution density on bonding area and slip area was studied.Thirdly,based on the measurement results of tool wear by ultra-depth-of-field microscope,the influence of variable distribution density micro-texture on tool wear is studied Based on the simulation of stress field of variable distribution density micro-texture tool,the influence of variable distribution density micro-texture on tool stress was studied.Through the comparative analysis of stress simulation results,titanium distribution detection results and milling force variation law,the anti-friction mechanism of variable distribution density micro-texture tools is revealed The anti-wear mechanism of micro-texture tools with variable distribution density was revealed by comparing and analyzing the influence of micro-texture on cobalt content and tool wear.It provides a basis for the optimization design of micro-texture with variable distribution density.Finally,based on the test and detection data,the Lasso regression prediction model is established.Based on the particle swarm optimization algorithm of Matlab,the parameters of micro-texture with variable distribution density are optimized and the optimal micro-texture distribution form is designed.