| 摘要 |
The present invention aims to simplify the negative-angle forming die as much as possible thereby reducing price, and at the same time aims to improve accuracy thereby making possible to provide a high-quality sheet-metal formed product. The present invention provides a rotary cam moving apparatus for a negative-angle forming die comprising a lower die half having a supporting portion for placing a sheet metal work, and an upper die half to be lowered straightly downward onto the lower die half for forming the work, an intrusion forming portion formed in the lower die half at an edge portion near the supporting portion inward of a downward stroke line of the upper die half, a rotary cam rotatably provided in the lower die half, a slide cam including an intrusion forming portion and slidably opposed to the rotary cam, and an automatic retractor provided in the lower die half for pivoting the rotary cam back to a position thereby allowing the work to be taken out of the lower die half after a forming operation, the work placed on the supporting portion of the lower die half being formed by the intrusion forming portion of the rotary cam and the intrusion forming portion of the slide cam, the slide cam forming the work by sliding, the automatic retractor pivoting back the rotary cam after the forming operation for allowing the work to be taken out of the lower die half, wherein a flange is formed at an end portion of the work in a direction across an axis of the pivoting, the work then undergoing an intrusion formation, the flange at the end portion of the work being protected from damage caused by retraction of the rotary cam, by dividing the rotary cam into an end rotary cam for placing the flange formed at the end portion of the work and the main rotary cam for the other portion, both of the divided rotary cams being disposed on a same axis of pivoting, the end rotary cam not being pivoted for an initial predetermined period of the retraction, thereafter the end rotary cam being moved axially toward the main rotary cam.
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