1. The shape of the stamped and drawn parts does not conform to the specifications

The key reason why the shape of the precision stamping part does not match the specification is the springback and inaccurate positioning. In addition to taking measures to reduce springback, the stability of blank positioning should also be improved.

2. Surface contusion of stamping and drawing parts

The surface contusion of stamping and drawing parts is due to improper material selection, low heat treatment hardness, poor smoothness, cavity curvature damage, poor surface quality of curved blanks, material thickness deviation, and process plan selection. Unscientific, lack of lubrication and other reasons.

3. Bending cracks in stamped and drawn parts

(1) The intersection angle between the bending line and the rolling direction of the sheet does not conform to the specified arrangement. When bending in a unidirectional V shape, the bending line should be perpendicular to the rolling direction; when double bending , the bending line and the rolling direction should be 45 degrees as far as possible.

(2) The plasticity of the material in the tension part is poor.

(3) The bending radius is too small and the pickling quality is poor.

(4) Insufficient wetness - greater friction.

(5) The radius of the convex and concave die is damaged or the gap is too small - the feeding resistance increases.

(6) The cutting and stamping parts of the blank of the stamping and drawing die are of poor quality - burrs and cracks.

(7) Serious deviation of material thickness specification - difficult to feed