Summary:Plastic mold is an important tool for the production of plastic products. It can give plastic products a complete config...
Plastic mold is an important tool for the production of plastic products. It can give plastic products a complete configuration and precise size. If the plastic mold is deformed, it will directly affect the quality of the plastic product, so we all need to pay attention to the deformation of the plastic mold. So,
how do we deal with the deformation of the plastic mold?
1. In order to reduce the deformation of the plastic mold, the heat treatment department should study together with the plastic mold design department to improve the plastic mold design. For example, try to avoid the plastic mold structure with greatly different cross-sectional sizes, strive to be symmetrical in the shape of the plastic mold, and combine the complex plastic molds. structure, etc.
2. When the shape of the
plastic mold cannot be changed, in order to reduce the deformation, some other measures can be taken. The general consideration of these measures is to improve the cooling conditions so that each part can be cooled uniformly; in addition, various mandatory measures can also be assisted to limit the quenching deformation of the parts.
3. The deformation of the asymmetric plastic mold is also the result of the combined effect of thermal stress and tissue stress. For example, for thin-walled and thin-sided molds, due to the thin mold wall, the temperature difference between the inside and outside during quenching is small, so the thermal stress is small; but it is easy to harden and the structural stress is large, so the deformation tends to expand the cavity.
4. For symmetrical plastic molds, the deformation tendency can be considered according to the cavity size, external size and height.
When the wall of the plastic mold is thin and the height is small, it is easier to harden, and it is possible that the tissue stress plays a major role. Therefore, the cavity often tends to expand. On the contrary, if the wall thickness and height are large, it is not easy to be hardened. At this time, thermal stress may play a major role. Therefore, the cavity tends to shrink.
In production practice, it is necessary to consider the specific shape of the parts, the type of steel used and the heat treatment process, etc., and experience is constantly summed up through practice. In actual production, the external dimensions of plastic molds are often not the main working dimensions, and they can be corrected by grinding after deformation.
