Simulation And Experimental Study On Vibration Cutting Temperature Of Metal Matrix Composites

With the development of industry,particle reinforced composites has become more and more popular.Ultrasound vibration cutting,as a precision machining technology,has also developed maturely.At present,little research has been done on the cutting heat and cutting temperature distribution of particle reinforced metal matrix composites in the process of ultrasonic vibration turning.Therefore,this study simulates the turning micro-model of particulate reinforced co:mposites with ABAQUS,a large-scale finite element simulation software,and conducts an auxiliary temperature measurement experiment.The main research work of this paper is as follows:Firstly,the theoretical model of temperature field in vibration cutting of particle reinforced composites is established,which can approximately solve the surface temperature field of work piece in ultrasonic vibration cutting of particle reinforced composites.Based on the basic theory of cutting temperature field,using heat source method,and considering the characteristics of pulse separation cutting in ultrasonic vibration cutting,the heat intensity of work piece surface is calculated,and the appropriate heat flux formula is obtained.According to the established heat transfer model in accordance with ultrasonic vibration turning,the final temperature field model of particle reinforced composite vibration cutting is obtained.Before the finite element analysis of temperature field in vibration cutting of metal matrix composites,it is necessary to determine the two-dimensional micro-finite element model of orthogonal cutting of particulate reinforced composites.Based on the basic principles of metal matrix composites design and the selection criteria of particle reinforced phases,the model determines the composition of metal matrix composites,and rationally simplifies its geometry and mesh model.Particle distribution is based on random distribution to better reflect the actual particle distribution of SiCp/Al composites,and the material model of work piece and tool and damage failure model suitable for this study are selected.Based on the established two-dimensional cutting geometry model,the vibration turning simulation of SiCp/Al composites is carried out.The distribution law of cutting temperature field in the simulation of one-dimensional directional vibration cutting and two-dimensional elliptical vibration cutting is analyzed.The single factor method is used to control variables.The cutting parameters such as cutting speed,cutting depth,ultrasonic vibration frequency and amplitude are used to discussed the variation of cutting temperature of composites under vibration cutting.Finally,based on the method of measuring the instantaneous cutting temperature of thin film thermocouple,the temperature measurement experiment of ultrasonic vibration turning of metal matrix composites is carried out.The influence of different cutting parameters on the cutting temperature of vibration cutting is discussed,and the reliability of the test method is verified.Based on the actual situation of cutting tools,SiO2 insulating film,NiCr/NiSi film electrode and SiO2 protective film were prepared by magnetron sputtering on the base of the flank of the cutting tool to be coated.A cemented carbide tool with temperature sensor for ultra-precision turning was made.The experiment proved that the thin film thermocouple temperature measurement technology can be used in particle enhancement.In the field of composite material vibration cutting temperature measurement,it is of great significance for the future measurement of ultrasonic vibration cutting temperature.