Injection mold refers to the injection molding technology to make some specific materials into a complete form, but in the process, injection processing accounted for most of the time, which can also explain the importance of this step, if the cooling effect is not good in cooling molding, will lead to defects in the finished product, but also affect the quality of the finished product and other.
Therefore, injection molding, pressure protection and cooling time must be reasonably arranged to improve the quality and productivity of injection molding products. Cooling time is the time period from the plastic melt filled with injection cavities to the time the parts can be removed from the open mold. The time standard for removing parts can be opened. Parts are usually completely cured with a certain strength and stiffness. When a part pops out of an open mold, deformation and cracking do not occur.
The results show that even with injection molding using the same material, the cooling time of the material varies with wall thickness, melt temperature, mold release temperature and injection mold temperature. Therefore, it is difficult to calculate the cooling time 100% accurately and only under appropriate assumptions.
At present, there are three reference criteria for the cooling time of injection molding: one is the temperature of the center layer of the thickest part of the injection molding wall, and the time required to cool down below the thermal deformation temperature of the plastic;