Optimization Research On The Accurate Blank Outline Of Multi-station Progressive Die For Complex Automotive Structure Parts

As an important process equipment to produce automotive parts,the design quality and cost of multi-station progressive die have an important influence on the production cost of automotive.Due to the complex spatial geometry of automotive parts,multi-station forming processes are needed,which are usually distributed in different station of progressive die.The outline and the formability of each station affect each other.Therefore,obtaining the accurate outline of sheet metal has always been a difficult problem to be solved in the design of automotive multi-station progressive die.Based on this,this paper takes the multi-station progressive die of complex automotive parts as the object,carries on the more systematic research to the accurate outline acquisition of sheet metal,the main research content and the conclusion are as follows:(1)Firstly,the method of obtaining the outline of sheet metal has been studied,and the initial outline of the sheet metal is obtained by using geometric expansion,one-step method and multi-step method of the finite element inverse algorithm.(2)The refined numerical simulation of multi-station linkage has been analysised.Based on AutoForm software,and the factors that affect the accuracy of numerical simulation are emphatically studied,and the fine settings of each influencing factor of high precision of numerical simulation are obtained.(3)The optimization of sheet metal outlinehas been studied.Based on the initial outline of sheet metal,the method based on material strain path and the numerical simulation of multi-station linkage based on Auto Form are adopted,and with the outline normal error as the optimization objective,the sheet metal outline is optimized by step by step iteration.The numerical simulation results show that the optimized outline can greatly meet the requirements of automotive parts' precision.(4)The method of outline optimization and numerical simulation is tested and validated.The optimized outline of sheet metal is used to testing.The testing results show that the product meets the precision requirement,and the effectiveness of the optimization method is verified.The numerical simulation results are in good agreement with the actual stamping test results,which shows the accuracy of the fined numerical simulation of multi-station linkage.