| SiCp/Al composite material is widely used in the fields of aircraft power transmission system,automobile suspension system,electronic product radiator and hydraulic system of machinery manufacturing industry because of its advantages of lightweight,strong plasticity and strong corrosion resistance.The hardness of SiC particles in SiCp/Al composites is high and the distribution of SiC particles is uneven,during the processing process,the tight combination between sic particles and Al matrix will make it difficult to separate them,resulting in difficult processing,and special processing technology and treatment methods are required to overcome these characteristics of the material.Laser assisted cutting technology can effectively reduce the cutting force and the residual amount of chips,improve the roughness of the material surface and reduce the surface burr,which provides a new idea and a new method for the efficient processing of SiCp/Al composite materials.Therefore,the theoretical and experimental analysis of laser assisted cutting SiCp/Al composite materials is carried out in this paper.The main work is as follows:(1)Taking the laser assisted cutting tool in SiCp/Al composite material as the research object,considering the change of temperature rise in cutting SiCp/Al composite material by laser irradiation,shear surface and knife-chip friction,the influence of the change of processing parameters on the change of tool temperature during laser assisted cutting was analyzed.The theoretical model of tool temperature in laser assisted cutting process is established and the machining parameters are analyzed.(2)Using Fortran language to compile DFLUX subroutine,the temperature field simulation model of three-dimensional laser irradiation SiCp/Al composites was established on the numerical analysis software.After laser irradiation,the temperature rise of each node on the surface and inside of the composite material was obtained,and the influence of laser power and spot size on the temperature change of the temperature measuring point in the cutting area was studied.(3)The model of SiCp/Al composite material with random distribution of round particles was established by Python language,and the pulse laser heat source subroutine was established in combination with the VDFLUX subroutine,and the tool temperature rise in the process of laser assisted cutting SiCp/Al composite material was analyzed by numerical analysis software.The effect of laser power,cutting depth and cutting speed on tool temperature with time was analyzed by numerical simulation.The surface formation process of SiCp/Al composite was analyzed by conventional cutting and laser-assisted cutting.(4)Laser irradiation experiment and laser assisted turning experiment of 25% SiCp/Al composite material were carried out.First,the laser power and spot size were calibrated,and the surface temperature rise of laser irradiated composite materials and the tool temperature rise during cutting were recorded by FAST-M200 infrared thermal imaging camera and the experimental data were analyzed.The surface of SiCp/Al machining after laser assisted cutting was analyzed by means of characterization instrument. |
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