Investigation On The Cutting Performance Of Micro-textured Ball Milling Cutter With Variable Distribution Density

Titanium alloy has been widely used in the field of Aeronautics and Astronautics since it was found because of its high strength,high heat resistance and high corrosion resistance.It has been selected as one of the main structural materials of engine and airframe.However,due to the poor processing performance of titanium alloy,it is difficult to process,which has become one of the factors limiting the development of titanium alloy.In recent years,it has been found that the micro texture on the tool can effectively improve the performance of the tool and improve the efficient machining quality of titanium alloy.Therefore,the research on the micro texture on the tool surface brings the direction for breaking through the tool technology and improving the cutting technology.In this paper,Firstly,the micro texture ball head milling cutter is taken as the research object,the static contact model of micro texture cutter and workpiece is established,and the friction reduction mechanism in the contact area of cutter chip after micro texture placement is analyzed by combining the friction theory;based on the structural characteristics of cutter itself and the milling process characteristics,the contact area of cutter chip is analyzed and calculated;according to the different friction forms between the chip and the front cutter surface in the contact area of cutter chip,the micro texture cutter is proposed The design concept and method of texture variable distribution density micro texture ball end milling cutter and the mathematical model of micro texture variable distribution density are established.Secondly,combined with the micro texture distribution and geometric model,the finite element simulation model of titanium alloy cutting with the micro texture ball end milling cutter with variable distribution density is designed and established.The cutting force and cutting temperature of titanium alloy cutting are simulated and analyzed by numerical analysis.The influence law of the micro texture distribution parameters on the cutting force and cutting temperature is obtained,and the influencemechanism is discussed,so as to reduce the cutting force and cutting temperature When the temperature is the target,the distribution density of micro texture in the bonding area is larger than that in the sliding area.And then,using laser processing technology to prepare micro texture with variable distribution density under the corresponding parameter distribution on the surface of ball end milling cutter,build a titanium alloy high-speed milling test platform,build a cutting force and cutting temperature measurement system,analyze the influence rule of micro texture distribution parameters on cutting force and cutting temperature,discuss the influence mechanism of different micro texture distribution density on cutting force and cutting temperature,and compare And verify the simulation conclusion;measure the machined surface integrity(surface roughness,surface work hardening,surface residual stress)of titanium alloy workpiece,combined with the analysis of the influence of micro texture on cutting force and temperature,under the condition of obtaining the influence rule of the variable distribution density micro texture ball head milling cutter on the surface integrity of titanium alloy,explore the influence of different parameters of the variable distribution density micro texture on the surface integrity Influence mechanism.Finally,based on the theory of fuzzy evaluation and AHP,the evaluation system of titanium alloy cutting performance of micro textured ball milling cutter with variable distribution density is established.The cutting performance of ball milling cutter with different distribution density is evaluated comprehensively.