Numerical Simulation And Process Research Of Temperature Field Of Laser Cladding 316L Stainless Steel

In recent years,laser cladding forming technology has developed rapidly and is gradually maturing.Some high-performance and complex metal parts can be realized by this technology in the case that the traditional subtractive mode cannot be processed.This technology can quickly manufacture metal parts with large or complicated structures,and can also be used to repair metal parts with long-term strain or manufacturing defects.At the same time,the technology can save most of the materials during processing,which not only can produce good economic benefits,but also meets the concept of low energy consumption and less pollution for social development.Therefore,laser cladding forming technology is an advanced manufacturing technology worthy of in-depth research and popularization.In this paper,316L stainless steel is used as the powder and matrix material for laser cladding.The temperature field of laser cladding is simulated using ANSYS software.The laboratory’s five-axis linkage additive machining center SVW80C-3D is used to complete Some experiments have verified the correctness of the simulation,and also optimized the actual laser cladding process parameters of this machining center.The specific research content is as follows:(1)Using ANSYS software to simulate a single laser cladding,explore the influence of process parameters on the maximum temperature of the molten pool,penetration depth and solidification parameters(shape control factor,cooling rate,temperature gradient),and study the single channel Distribution of solidification parameters in different areas of the cladding layer.(2)Based on the simulation results,a single-track cladding experiment was designed using response surface method,and the experimental data was processed by Mintab software.Finally,the process parameters of laser single-track cladding were optimized,and the cladding layer gold under different process parameters was also explored.The change law of phase structure validates the inferences obtained by simulation.(3)Simulation of laser single-pass multi-layer cladding forming,exploring process parameters and processing methods to maintain stable melt pool size and temperature,and analyzing solidification parameters of single-pass multi-layer thin-walled parts from bottom to top Distribution.(4)Based on the simulation results,experiments were performed on the thin-walled parts by laser cladding,and the forming quality,forming accuracy,and distribution of metallographic structures in different regions were observed,and the simulation results were verified.(5)Analyze the three-dimensional geometric model of the twisted thin-walled part,and combine the previous experiments to complete the actual processing of the twisted thin-walled part.