Patent ID: 6038908
Filing Date: 2000-03-21
Classification: B21D

Abstract:
A bending die comprising a lower die having a groove-like cavity formed at its upper surface, the cavity having an inner circumferential surface; a rotary die supported in the cavity of the lower die at both ends thereof by a shaft and rotatably stored in it; an upper die arranged above the rotary die; and a driving device for rotating said rotary die in a downward direction after the upper die is opened and for retracting it, whereinthe inner circumferential surface of the cavity at said lower die is formed with some protrusion steps for use in supporting the rotary die when pressing operation is carried out, the protrusion steps being formed into flat surfaces;the upper surface of said rotary die is formed with a forming part for use in gathering and bending a metallic plate to be extended in a longitudinal direction of the rotary die;said upper die is formed with a gathering and bending blade to be fitted to the forming part of the rotary die; andthe rotary die is supported by the protrusion steps while the outer edge of the forming part is being abutted against the upper edge of the lower die when pressed, and after pressing operation, the rotary die is rotated in a downward direction by said driving device.