• ①Should be adapted to the locally formed shape, so that the material can flow reasonably
• ② When there are multiple process holes and process incisions, there should be enough overlap between them, so that the punch can tension the material, ensure the forming effect, avoid the defects such as Bowen, and obtain good quality after trimming. Flanging quality.
• ③The cut part (opening) of the incision should be adjacent to the edge of the raised part or the area that is easy to break.
• ④ The number and size of the cuts should ensure that the deformation of the material in the local forming part tends to be uniform, otherwise the occurrence of cracks may not be prevented.

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