| With the development of new energy vehicles,the demand for automobile connectors is increasing year by year,and as the core component of automobile electric connector,the quality of workpieces after forming directly affects the safety when driving on the road,and its importance could be imagined.The combination of experiment and finite element simulation is adopted to explore the influencing factors affecting the stamping performance of C5210 alloy strip for automobile connector,the microstructure of the strip has been changed by annealing treatment,and the mechanical properties and residual stress of C5210 alloy strip has been regulated,and then the stamping performance of C5210 alloy strip for automotive connector has been optimized.The 0.35 mm thick C5210 alloy strip for the automotive connector has been selected for the research object in this paper.and the stamping and bending properties of copper alloy strip and strip stamping forming were analyzed.The experimental equipment,principle and sample preparation involved in the study have been introduced respectively,through stretching experiment,electron backscattering diffraction(EBSD)experiment,stamping bending experiment and residual stress experiment,the mechanical properties parameters,microorganization,texture and stamping bending properties and residual stress of C5210 alloy strip for automotive connector have been obtained experimentally,and provide data support for the subsequent finite element simulation and mechanism analysis.In the actual production,the C5210 alloy strip for the automotive connector will generally undergo 210℃ annealing treatment,Therefore,the mechanical properties,tissue properties and stamping properties of the cold-rolled strip and the 210℃ annealed strip bave been determined in this paper.Analyzing the mechanical property parameters and microstructure and texture changes of C5210 alloy strip before and after annealing,And,through the research we found that,After annealing at 210℃,The hardening index increase and the thickness isotropy coefficient of the C5210 alloy strip have increased significantly,the degree of anisotropy was slightly reduced,the stamping forming performance has improved,However,the strip still has cracking or folding defects after stamping along the TD.In order to analyze the influence of material performance parameters on strip stamping forming performance,the numerical simulation model of C5210 alloy strip stamping bending for automotive connector has been created,establish the yield criterion and hardening model suitable for 210℃ annealed alloy C5210 strip performance parameters,and verify the numerical simulation with actual stamping bending,and study the influence of material performance on stamping forming performance using finite element simulation.The influence of anisotropy value and hardening index on the stamping formability of strip have been studied : when the material anisotropy value was certain,with the increase of the hardening index,the maximum thinning rate and the maximum effect force of the strip are smaller,which can improve the stamping and forming performance of the strip;when the hardening index n has a certain value,small anisotropy value is more beneficial to improve the stamping performance of C5210 alloy strip..The performance and organization of C5210 alloy strip have been regulated by optimizing annealing process,the influence of low temperature annealing on material performance parameters has been studied,,and the mechanical properties,microorganization and residual stress of the C5210 strip after optimizing the annealing process have been analyzed,the change and the influence mechanism were analyzed.And the appropriate annealing temperature have been selected,which control the hardening index and anisotropy of the C5210 strip,and conduct the actual stamping bending test for verification,so as to optimize the stamping bending performance of the C5210 alloy strip for automotive connector. |
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