Generally cut the edge first, punch the guide, hit the pre-cut, press line, hit the bump, tear the mouth,(incision, stretching), after the punch, press the bristle, forming, bending in two steps, forming half first, forming the other half after forming.
2, in the punching hole feed, generally first punch small holes, and then punch large holes; First, the waste material around the forming is washed off, and then the rest of the material is dropped: because if the punch hole is placed behind, then when it is punched, there may be a gap in the part of the corresponding material belt around the punch(the hole that has been punched in the front), In this way, the punch will cause uneven force during the stamping process(will generate lateral force). Originally, the strength of the small hole punch is very weak, and the force is uneven, and it is very easy to break. Of course, this is only most cases. Sometimes according to the actual situation, The small hole punch can be ranked behind, but there are still methods. If the punch thickness is too small, it can be reinforced in the line: A: Use off-plate precision guidance; B: PG(optical grinding) processing is used for punching.
3, determine whether to use edge:
The cutting edge is generally used on the continuous mode and the falling mode. Its function is rough positioning, and it is easy to feed the material during the test mode. Some cutting edges also have the role of punching shapes. If the mold is first pressed to locate the needle hole, then immediately use the guide needle to direct the line, generally no cutting edge is needed; If there is no guide needle, cut the edge first, used to set the distance, generally used in the falling mold.