What Are The Types Of Gaps Between Injection Molds And Stamping Materials?

What are the types of gaps between injection molds and stamping materials?

The waste is essentially the reverse image of the shape hole. In other words, the same position is in the opposite position. By checking the waste, it can be judged whether the gap between the upper and lower molds is correct. If the gap is too large, the scrap will show rough, undulating fracture surfaces and narrow bright band areas. The larger the gap, the larger the angle formed by the fracture, and the larger the area of the bright band. If the gap is too small, the scrap will show a small-angle fracture surface and a wide bright band area.

Excessive gaps form holes with large curls and torn edges, making the outline slightly protruding and the edges very thin. If the gap is too small, a ribbon with slight curling and large angle tear will result, resulting in a part more or less perpendicular to the surface of the material. The ideal waste material should have a reasonable broken angle and uniform bright band. This keeps the punching pressure to a minimum and creates a neat round hole with minimal burrs. From this perspective, increasing the gap to extend the life of the mold is at the expense of the quality of the finished hole.

Selection of injection mold gap

The gap of the die is related to the type and thickness of the stamping material. Unreasonable clearance will cause the following problems:

(1) If the gap is too large, the burrs of the parts to be stamped will be relatively large and the stamping quality will be poor. If the gap is too small, although the punching quality is good, the die wear is serious, which greatly reduces the service life of the die and is likely to cause the punch to break.

(2) If the gap is too large or too small, it is easy to cause adhesion on the punching material, resulting in strips during the punching process. If the gap is too small, a vacuum is easily formed between the bottom surface of the punch and the plate, and the scrap rebounds.

(3) Reasonable clearance can prolong the service life of the mold, have a good discharge effect, reduce burrs and flanging, keep the board clean, the hole will not scratch the board, reduce the number of sharpening times, keep the board straight, and Precise stamping positioning.