Patent ID: 9003858
Filing Date: 2015-04-14
Classification: B21D

Abstract:
1. A bending die having surface microstructures, applicable to stamping processing to bend a blank to form a shape, the bending die comprising: a lower die, disposed on a die base, the lower die comprising a die, and the die comprising a forming surface; an upper die, comprising a bending punch, the bending punch stamping a blank placed on the die in a back and forth stroke, and the bending punch comprising a working portion coming into contact with the blank during stamping; and a workpiece placing piece, disposed between the upper die and the lower die, and used to position or press the blank placed on the die; wherein a plurality of microstructures are disposed on the forming surface and/or on the surface of the working portion, wherein the plurality of the microstructures are in the pattern of a plurality of grooves or a plurality of concaves or a combination of a plurality of grooves and a plurality of concaves, wherein the plurality of grooves of the microstructures are arranged intersecting each other or parallel to each other.