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In-Depth Analysis! The principle of speed segmentation of injection molding processing.
The principle of speed segmentation of injection molding process is that in the injection process, according to the flow state of the plastic melt in the mold and cooling time, the whole injection process is divided into several stages, each stage has its ideal injection speed. The purpose of doing so is to better control the shape and size of the product, reduce the generation of defects, improve product quality and productivity.
The principle of speed segmentation in the injection molding process usually consists of three main phases: the filling phase, the pressure holding phase and the cooling phase.
1. Filling phase: In this phase, mainly the plastic melt enters the mold cavity through the nozzle and fills the corners of the mold. This phase should be as fast as possible in order to accomplish most of the filling in a short period of time. However, it should not be too fast, otherwise problems such as bubbling and burning may occur. Therefore, the speed of this stage needs to be determined according to the specific plastic material, mold design and injection pressure.
2. Pressure holding stage: After the filling stage is completed, a certain pressure needs to be maintained so that the plastic melt can further fill the fine parts of the mold. This stage is generally slower than the filling stage to prevent excessive compression and cooling of the plastic melt. The duration of the holding pressure stage also needs to be determined according to the specific product requirements.
3. Cooling Stage: After the holding pressure stage is completed, the plastic melt begins to cool and solidify. The speed of this stage is mainly determined by the cooling system. Generally speaking, the faster the cooling speed, the better the dimensional stability of the product. However, too fast a cooling rate may lead to stresses within the product, affecting its performance. Therefore, the cooling rate also needs to be adjusted according to the specific plastic material and product requirements.
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