Shenzhen twenty years mold factory: how to deal with plastic mold product deformation？
In the injection molding process, the most feared is the product deformation problem, once the deformation, is equal to the production of finished products can not be used. There is a mold problem, then how do we go in the production process to solve this kind of problem? Here are a few suggestions:
1, in order to reduce the deformation of the plastic mold, heat treatment department should work with the plastic mold design department to improve the plastic mold design, such as avoiding as far as possible the cross-section size difference is the plastic mold structure plastic mold shape strive to symmetry, complex plastic mold with the collocation structure.
2, when can not change the shape of the mold, in order to reduce the deformation, but also can take some other measures. The general consideration is to improve the cooling conditions, so that the parts can be evenly cooled; In addition, can also be supplemented by a variety of forced measures to limit the quenching deformation of the parts.
3, for the asymmetric plastic mold deformation, the same is also thermal stress, tissue stress is the result of the combined effect. For example, the thin-walled thin edge of the mold, due to the thin wall, quenching inside and outside the temperature difference is small, and thus the thermal stress is small: but easy to quench, the organization of stress is larger, so the deformation tends to cavity expansion.
4, for symmetrical plastic mold, according to the cavity size, external dimensions, height to consider the deformation tendency.
When the plastic mold thin wall, height, it is easier to quench, may be the main role of tissue stress, therefore, the cavity often tends to expand. On the contrary, thick, height, it is not easy to JinTao, at this time may be thermal stress plays a major role, therefore, the cavity often tends to shrink!
5, in the mold manufacturing selection of materials should choose a good corrosion resistance, high corrosion resistance of many resins and additives on the surface of the blank has a corrosive effect, the corrosion of the cavity surface gold dissolution, flaking, table condition deterioration, the quality of the plastic parts deterioration.
6, good dimensional stability in plastic molding, plastic mold type dissolution temperature to reach more than 300C, for this reason, it is best to use the appropriate tempering treatment of tool steel (heat treatment steel). Otherwise it will cause changes in the microstructure of the material, resulting in changes in the size of the plastic mold.
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