Common problems

1. Adhesion and scratch: poor appearance on the surface of the part or die due to friction between the material and the punch or die;

2. Burr: mainly occurs in the gap between the cutting die and the blanking die, or the burr will be produced when the gap between the cutting edges is large or small;

3. Line offset: when the part is formed, the part contacting with the die is first extruded and a line is formed;

4. Convex concave: there are foreign matters (iron filings, rubber, dust) mixed in the uncoiled line, causing convex concave;

5. Twists and turns: due to uneven stress, poor matching of drawbead or poor control of press slider, etc., twists and strains occur at corner R or embossed part of the part;

6. Wrinkles: wrinkles at the edge or R position are caused by poor adjustment of the press slide, low accuracy of the press, improper adjustment of air cushion pressure, large punch or R position, etc.