Precision injection molding holds an extremely important position in the field of industrial manufacturing, and its processing quality directly affects the performance and quality of products. During the precision injection molding process, there are numerous factors that can impact the outcome, which will be analyzed in detail below.
Factors Related to Volume Changes Caused by Crystallization
In injection molding, crystallization can lead to volume changes. This characteristic results in some unique phenomena during the processing: the pressure is relatively high, the viscosity difference of the molten material is small, and the interlayer shear stress is also small. After demolding, there will be a significant elastic rebound. However, this elastic rebound also brings a certain advantage, as the shrinkage in precision injection molding can be appropriately reduced. Additionally, the material temperature has a significant impact on shrinkage. When the material temperature is high during injection molding, the shrinkage amount increases, but the directionality of shrinkage is small.
Pressure-Related Factors
Pressure is a crucial influencing factor in precision injection molding. When the pressure during injection molding increases, the shear action on the molten material intensifies, thereby increasing its fluidity. Different types of materials have varying degrees of sensitivity to pressure, with PE (polyethylene) and POM (polyoxymethylene) being relatively sensitive. Therefore, during the molding process, the fluidity of the molten material can be effectively controlled by adjusting the pressure during injection molding to meet the processing requirements of different products.
Multi-Factor Coordinated Control of Filling Conditions
During the precision injection molding process, the filling condition directly affects the integrity and quality of the product. To achieve the ideal filling effect, it is necessary to comprehensively control multiple factors. Specifically, the filling condition can be appropriately adjusted by regulating the material temperature, mold temperature, pressure during injection molding, and injection speed. Only by controlling these factors within a reasonable range can precision injection molding meet high-quality requirements.
