Research On Laser Cladding Forming And Milling Performance Of 316L Stainless Steel

Based on the Laser Engineered Net Shaping technology,the laser cladding forming process of 316L stainless steel powder can get rid of the limitations of mold tools,and realize the digital advanced technology of directly manufacturing metal parts through the method of layer-by-layer cladding and accumulation using only three-dimensional model data.However,in the current laser cladding process,there is still a lack of research on the coupling of adding and subtracting materials.Therefore,this paper uses 45#steel as the cladding matrix and 316L stainless steel powder as the cladding material.Through the research path of combining simulation and experiment,Mainly for the study of the material properties and milling performance of 316L stainless steel under the LENS laser near-net-shape cladding process,through the study of the microstructure and the milling reference factors and other aspects of the relationship,the additive manufacturing process parameters and material reduction The milling processing parameters were optimized,and the feasibility of the laser adding and subtracting process was further summarized by comparing the material properties of the laser cladding sample and the forging sample.The main content includes the following aspects:(1)By studying the effect of different additive process parameters on the microstructure of the formed specimen and the influence of the tensile hardness and wear resistance of the material during the near-net forming process of the laser cladding,summarize and compare more Optimized laser cladding forming process.Under the optimized design of process parameters,by analyzing the influence law between the trajectory planning,the forming direction,the laser power,the forming efficiency,and the forming test piece,and the comparison with better production efficiency as the evaluation standard,the relatively optimal is finally obtained.Process parameters,and analyze the laser additive manufacturing process design plan through comparison with the forging manufacturing test piece,to provide research basis and research samples for subsequent subtractive process research;(2)Use ABAQUS finite element simulation software to establish the temperature field and stress field simulation analysis model of the laser cladding near-net forming process,and use the Model Change life and death unit technology to perform finite element simulation calculations on the 316L stainless steel single-layer multi-channel laser cladding process,Under the design parameters of laser power 350W,scanning speed 5.5mm/s,laser beam radius 1mm,analyze the temperature field and stress field distribution of the test model under different load steps,and collect the external temperature of the cladding layer through a thermocouple The data verifies the simulation calculation results,and then determines the existing residual temperature and residual stress state of the workpiece when the workpiece is cut into the tool between the increase and decrease of the material and the tool change;(3)Under the plan of combining simulation and experiment,ABAQUS finite element simulation software is used to establish the stress field of the milling process and the support reaction force model of the reference point,and the physical simulation of milling uses the orthogonal test method to analyze the milling speed,The influence law between the milling processing parameters including the feed speed and the amount of back-cutting and the milling force,and the relationship between the milling speed and the cutting force under different initial temperature conditions of the workpiece is analyzed according to the simulation results.Using cutting force,tool wear,and machined surface roughness as evaluation indicators,the milling performance of laser cladding near-net-shape 316L stainless steel under different additive process parameters was analyzed,and the milling processing parameters were optimized.