Cryogenic Minimum Quantity Lubrication High Speed Milling SiCp/Al Composite Study On The Mechanism Of Tool Wear

Cryogenic Minimum Quantity Lubrication(abbreviation:CMQL)technology belongs to the new green cutting processing technology.This technology is an effective combination of low temperature cold air and micro lubrication(MQL),which can effectively reduce the cutting temperature,alleviate tool wear and Extend tool life.Si Cp/Al composites have excellent thermal conductivity,high specific strength,specific stiffness and other properties,and are widely used in aviation,aerospace and automotive manufacturing fields.Si Cp/Al composites contain reinforcing phase Si C particles,resulting in poor workpiece surface quality and severe tool wear.In this paper,the low-temperature micro lubrication technology is combined with the high-speed cutting of difficult to machine materials.The tool wear of high-speed milling of Si Cp/Al composite material with PCD tool under the condition of low-temperature micro lubrication cutting is studied,which provides a theoretical basis for the application of low-temperature micro lubrication technology in actual cutting.Firstly,taking the tool wear and workpiece surface roughnes s as the evaluation criteria,using different tool sizes and geometric parameters to carry out the comparative test of low temperature micro lubrication high speed milling Si Cp/Al composite materials,select the sui Table tool and tool geometric parameters;carry out the single factor test of low temperature micro lubrication technical parameters,select the optimal technical parameters of CMQL;analyze the low temperature micro lubrication technology Influence on tool durability.Secondly,the single factor experiment of CMQL high speed milling Si Cp/Al composite material was carried out by using the optimized process parameters of CMQL.The influence of different milling parameters on the tool wear was studied.The front and back cutter faces of the worn milling insert were analyzed by using the ultra depth of field microscope and scanning electron microscope.The wear reason and wear mechanism of the tool were explored by combining with Raman spectroscopy.Thirdly,based on the results of tool wear test,the appropriate milling parameters are selected for orthogonal test of tool wear.Using the empirical formula of tool wear,the prediction model of tool wear of Si Cp/Al composite material is established,and the significance of the model and coefficient is te sted.Based on the principle of genetic algorithm,the minimum tool wea r when the metal removal rate is the highest is taken as the objective function,and the cutting parameters are improved Row optimization.Finally,Deform simulation software is used to simulate the general situation of high-speed milling Si Cp/Al composite material in CMQL cutting environment.The wear morphology and wear amount of the front and rear tool surfaces are compared and analyzed,and the cutting temperature field is combined t o further simulate and predict the tool wear.