Common Problems And Solutions For Stamping Dies

Die stamping is a cold forming process that takes a strip of metal, also called a blank or tool steel, and cuts and shapes it using a single or series of dies to create a desired shape or profile. The force that is applied to the blank modifies and changes its geometry, which creates stress that makes the workpiece suitable for bending or shaping into complex forms. The parts produced can be exceptionally small or extremely large depending on the application. The die stamping process, also known as pressing, includes a number of techniques such as punching, blanking, piercing, coining, and several other operations. Designs are required to be precise so that each punch produces optimal quality.


1.Scrap jump hole

1) The length of the punch is not enough, cut into the die according to the edge of the punch, add a thickness of 1mm to replace the punch

2) The gap of the die is too large, cut the insert to reduce the gap or use a drape machine to reduce the gap

3) If the punch or template is not demagnetized, use a demagnetizer to demagnetize the punch or template


2.Blocking holes with waste

1) The blanking hole is small or the blanking hole is offset to enlarge the blanking hole to make the blanking smooth

2) The blanking hole is chamfered, increase the blanking hole to remove the chamfer

3) The taper of the knife-edge is not placed, the line cutting taper or the reverse side expansion hole reduces the length of the straight wall

4) The straight wall of the knife-edge is too long, and the reverse side is drilled to shorten the straight wall of the knife-edge

5) The cutting edge collapsed, resulting in a large drape, blocking the material and re-grinding the cutting edge


3.Poor cover

1) The cutting edge collapsed, causing the drape to be too large and re-grind the cutting edge

2) The gap between the punch and the die is too large, the line is cut into the block, and the gap is reconfigured

3) The poor finish of the knife-edge of the die and the polished knife edge has a straight wall

4) The gap between the punch and the die is too small, save the die again and match the gap

5) If the ejecting force is too large, pull out the front to change the spring to reduce the ejecting force


4.Uneven cut edges

1) Positioning offset adjustment positioning

2) With unilateral molding, pull the material to increase the pressing force and adjust the positioning

3) Design error, resulting in uneven connection of the knife, re-line cutting, and cutting edge inserts

4) Feeding is not allowed to adjust the feeder

5) The calculation of the feeding step is wrong, recalculate the step, and re-fix the tool position