Study on forming limit of micrometer thickness metal foil cup process
The utilization of 304 stainless steel in certain precision components often necessitates meticulous treatment of the material to achieve ultra-thin dimensions.Consequently,exploring the forming behavior of ultra-thin 304 stainless steel metal foil holds significant importance.304 stainless steel foil with micron thickness is used as the research material to study the influence of friction coefficient,thickness anisotropy index and blank holder force on the forming performance of 30,60 and 100 μm thickness specimens.The mechanical parameters of three different thickness specimens are obtained by tensile test,and then the obtained mechanical parameters are input into LS-DYNA finite element software for simulation.The simulation results were verified by the cupping test,and the two were consistent.The influence factors of the forming performance of the specimen are studied by finite element simulation.The results show that the smaller the friction coefficient,the larger the thickness anisotropy index,and the smaller the blank holder force in a certain range,the better the forming performance of the specimen.Finally,the lithography method is used to print the grid of the ultra-thin metal foil material,and the forming limit diagram is drawn by taking the 60 μm thickness specimen as an example.
ultra-thin metal foil304 stainless steeltensile testcupping testprint the gridLS-DYNAforming limit diagram
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