What are the main reasons for the deformation of injection mold products?

What are the main reasons for the deformation of injection mold products?
For people engaged in injection mold manufacturing and injection molding, the deformation of plastic parts is a painful problem, and it is one of the main reasons for the high scrap rate of products.We have been exploring the true causes of deformation to find ways to control deformation, with the help of advanced computer analysis and experience in trying to control the deformation of plastic parts, but the problem is repeated time and time again.
This paper attempts to deeply explore the real causes of plastic deformation and various factors that affect it from the aspects of plastic material characteristics, product design, mold design, and molding process.
Thus helping us find better ways to control deformation at work.Most of our products(Plastic Lampholder、Plastic Electric Plug Case)contain plastic materials, The following is an analysis to prevent product deformation

The nature of deformation
The phenomenon of plastic deformation is various, and its essence is the effect of the internal stress of the injection molded part. The deviation of the product from the designed shape is the effect of force, and the product without the effect of force will not deviate from the designed shape. On the one hand, the amount of deformation determines
On the one hand, the size of the internal stress is determined by the ability of the product structure to resist internal stress, that is, the rigidity of the product structure. The deformation of injection molded parts is essentially a stress release, that is, the internal stress of the product passes through the
The deformation reaches a certain release. We all know that any plastic material has a theoretical shrinkage rate, which is a shrinkage rate representing the number of mold steels and the corresponding plastic product size, provided by the plastic material supplier, but
It is a theoretical reference data.
Because of the shrinkage characteristics of plastic materials, when the sol fills the mold cavity, the material begins to cool and solidify, resulting in volume shrinkage. At this time, deformation begins to appear. The complex plastic parts and mold structures lead to the injection molding production process
The sol filling speed in each area of ​​the mold cavity, the pressure distribution of the mold cavity, and the difference in heat conduction cannot achieve a uniform state. The uneven shrinkage leads to the internal stress of the product, and the effect of the internal stress is the injection molding.
The nature of deformation
The deformation of plastic parts exists, and the difference is only in different degrees. All our efforts are not to eliminate the deformation, but to control the deformation within the permitted range.