Research On Laser Assisted Turning Technology And Experiment Of SiCp/Al Composites

SiCp/Al composite material is a good engineering material with excellent elastic modulus,strength,and thermophysical properties.These excellent properties have opened up broad prospects for the application of SiCp/Al composite material in modern industry.However,conventional machining methods can easily cause severe tool wear and surface damage,hindering the widespread application of SiCp/Al composite materials.Laser assisted machining technology is a highly potential machining method that can reduce the material strength in the laser heat affected area,improve machinability,significantly reduce cutting force,reduce tool wear,and surface damage.Based on the above background,in order to verify the feasibility of laser assisted machining in SiCp/Al composite material processing,the cutting mechanism of Laser Assisted Turning(LAT)SiCp/Al composite material was explored and compared with conventional turning(CT).The specific research content is as follows:(1)Conduct simulation research on SiCp/Al composite material irradiated by a mobile laser heat source.Based on the transient heat transfer differential equation,a simulation model of the temperature field of the moving laser heat source is established.Analyze the effects of different laser movement speeds and laser power on the surface and internal temperature fields of SiCp/Al composite materials,providing a basis for the selection of subsequent cutting experimental parameters.(2)Establish a cutting force model for laser assisted turning of SiCp/Al composite materials.Based on the mechanism of cutting force generation,establish cutting force models for three cutting deformation zones,and consider the influence of laser on the temperature of different deformation zones during the modeling process.Measure the cutting force during laser assisted turning of SiCp/Al composite materials and verify the accuracy of the cutting force model.Compare and analyze the effects of different process parameters on cutting force under laser assisted turning and conventional turning conditions,and explore whether laser assisted turning can effectively reduce cutting force.(3)Explore the influence of laser assisted turning on surface quality.Based on the simulation results of the laser temperature field,appropriate experimental parameters are selected to conduct laser assisted turning and conventional turning experiments on SiCp/Al composite materials,explore the surface damage forms under different processing methods,analyze the influence of different cutting parameters on surface roughness under laser assisted turning and conventional turning conditions,and explore whether laser assisted turning can effectively improve the quality of the processed surface,Prove the superiority and feasibility of laser assisted turning technology.(4)The effects of laser parameters and cutting parameters on chip morphology and tool wear are studied.Compare and analyze the macro morphology and cross-sectional micro morphology of chips in laser assisted turning and conventional turning,determine the influence of different laser parameters and cutting parameters on chip formation,and establish a chip formation process model based on the arrangement model of particles in the shear zone and laser thermal influence theory.The effects of laser assisted turning and conventional turning on tool wear were compared and analyzed,and the scanning electron microscope and EDS energy spectrum analysis were used to explore whether laser assisted turning can effectively improve tool wear.