Bending die having surface microstructures and bending punch thereof

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.