公开(公告)号：US20220161307A1

公开(公告)日：2022-05-26

申请号：US17102882

申请日：2020-11-24

申请人： Dajun Zhou ,  Kaiping Li ,  Robert D. Miller ,  Richard J. Siemen ,  Yongiun Zhou

发明人： Dajun Zhou ,  Kaiping Li ,  Robert D. Miller ,  Richard J. Siemen ,  Yongiun Zhou

IPC分类号： B21D22/02

摘要： A stamping machine configured to shape a sheet material including an upper binder including first teeth, a lower binder including second teeth, and a punch. A first cylinder is positioned between a lower binder and a support surface. A second cylinder is positioned between the upper binder and the lower binder. A cushion pin is positioned at the support surface that is configured to contact and control movement of the lower binder relative to the punch. A force exerted by the second cylinder is greater than that exerted by the first cylinder, and the force exerted by the cushion pin is greater than that exerted by the second cylinder. The first and second cylinders and the cushion pin are used to control when the first and second teeth are permitted to engage the sheet material, which assists in preventing or minimizing spring back of the sheet material through post-stretching.

公开(公告)号：US11845122B2

公开(公告)日：2023-12-19

申请号：US17102882

申请日：2020-11-24

申请人： Dajun Zhou ,  Kaiping Li ,  Robert D Miller ,  Richard J Siemen ,  Yongiun Zhou

发明人： Dajun Zhou ,  Kaiping Li ,  Robert D Miller ,  Richard J Siemen ,  Yongiun Zhou

IPC分类号： B21D24/08 ,  B21D22/22

CPC分类号： B21D24/08 ,  B21D22/22

摘要： A stamping machine configured to shape a sheet material including an upper binder including first teeth, a lower binder including second teeth, and a punch. A first cylinder is positioned between a lower binder and a support surface. A second cylinder is positioned between the upper binder and the lower binder. A cushion pin is positioned at the support surface that is configured to contact and control movement of the lower binder relative to the punch. A force exerted by the second cylinder is greater than that exerted by the first cylinder, and the force exerted by the cushion pin is greater than that exerted by the second cylinder. The first and second cylinders and the cushion pin are used to control when the first and second teeth are permitted to engage the sheet material, which assists in preventing or minimizing spring back of the sheet material through post-stretching.