The Dynamic Problems in High Speed Transfer Stamping System
In this paper the authors would like to disclose the application of LS-DYNA, the dynamic explicit finite element method, in high speed transfer stamping system development. Transfer stamping process has the advantages of material saving and automation especially for stamping parts with complicated geometry. The dynamic effects will be induced as the stamping speed up to 200 SPM i.e. the contact dynamics of barrel cam and followers, transient dynamic effect as grippers contact with blanks and the die swell caused dimension inaccuracy problems, etc. According to the numerical results, we have modified the original design for barrel cam structure and dimension, roller size and transfer bar diameter to enhance the component endurance life. We used the NURBS curves in the cam curves design, which reduced the impact force as the rollers crossed over the contact sides at each groove and traveled smoothly. The gripper designer referred the simulation results to avoid the parts tilting after the grippers closed. All the dynamic problems of transfer system were under controlled via the computer simulation and we have designed our system stamping speed up to 250 SPM successfully.
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The Dynamic Problems in High Speed Transfer Stamping System
In this paper the authors would like to disclose the application of LS-DYNA, the dynamic explicit finite element method, in high speed transfer stamping system development. Transfer stamping process has the advantages of material saving and automation especially for stamping parts with complicated geometry. The dynamic effects will be induced as the stamping speed up to 200 SPM i.e. the contact dynamics of barrel cam and followers, transient dynamic effect as grippers contact with blanks and the die swell caused dimension inaccuracy problems, etc. According to the numerical results, we have modified the original design for barrel cam structure and dimension, roller size and transfer bar diameter to enhance the component endurance life. We used the NURBS curves in the cam curves design, which reduced the impact force as the rollers crossed over the contact sides at each groove and traveled smoothly. The gripper designer referred the simulation results to avoid the parts tilting after the grippers closed. All the dynamic problems of transfer system were under controlled via the computer simulation and we have designed our system stamping speed up to 250 SPM successfully.
13-4.pdf
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