Punching mold for preventing rebound of bent piece

Abstract

The invention relates to the field of punching molds, in particular to a movable punching mold. The punching mold comprises a convex mold; an included angle between a side forming surface and a bottom forming surface of the convex mold forms an anti-rebound included angle alpha; a concave mold matched with the convex mold includes a side mold and a bottom mold; the outer side of the side mold and a side mold bracket are hinged by a hinge shaft; when the side mold rotates, an included angle between an inner side forming surface of the side mold and a bottom mold forming surface of the bottom mold forms a bent angle gamma; and the bent angle gamma is positioned between the anti-rebound included angle alpha and a demolding included angle beta. A rebound angle delta alpha is considered when the upper mold is designed; an actual bent angle of a piece A to be bent when molding in a mold cavity is consistent with the anti-rebound included angle alpha; and after the piece A to be bent is taken out from the mold cavity, the actual bent angle of the piece A to be bent after less rebound is equal to a theoretic bent angle, so that the influence on the bent piece by elastic deformation is thoroughly solved, the precision of the bent angle of the bent piece is guaranteed, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of stamping dies, in particular to a movable stamping die. Background technique [0002] Generally, the deformation of bending parts includes elastic deformation and plastic deformation. When the external force is removed, the plastic deformation is preserved, and the elastic deformation will restore the bent part to its original shape, resulting in springback. As a result, the bending angle and bending radius of the press bending part are no longer consistent with the bending die. The change of bending angle is often expressed by springback angle △α. The rebound angle refers to the difference between the angle of the bending part after it leaves the bending die and the angle of the bending die. In particular, the rebound phenomenon of the thin-walled shell bending parts is more serious, and the deviation of the bending angle is large (the actual bending angle is greater than the theoretical bending angle), resulti...

AI Technical Summary

Problems solved by technology

In particular, the springback phenomenon of thin-walled shell bending parts is more serious, and the bending angle deviation is large (the actual bending angle is greater than the theoretical bending angle), resulting in poor product quality

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