Structural elements to be considered in injection mold design

The parting surface refers to the contact surface where the concave and convex molds cooperate with each other when the mold is closed. The selection of its position and form is influenced by factors such as the shape and appearance of the product, wall thickness, molding method, post-processing technology, mold type and structure, demolding method, and molding machine structure.
Structural components, including sliders, inclined tops, and straight top blocks of complex molds. The design of structural components is crucial, as it relates to the lifespan, processing cycle, cost, and product quality of the mold. Therefore, designing complex core structures for molds requires a high level of comprehensive ability from designers, who strive for simpler, more durable, and more economical design solutions as much as possible.
Mold accuracy, including card avoidance, precise positioning, guide columns, positioning pins, etc. The positioning system is related to the appearance quality of the product, the quality and service life of the mold. Different positioning methods are selected according to the different mold structures. The positioning accuracy control mainly relies on processing, and the internal mold positioning is mainly considered by the designer to design a more reasonable and easily adjustable positioning method.
The pouring system refers to the feeding channel between the injection molding machine nozzle and the mold cavity, including the main channel, diversion channel, sprue, and cold material cavity. Especially the selection of the gate position should be conducive to the molten plastic filling the mold cavity in a good flow state, and the solid flow channels and gate cold materials attached to the product should be easily pushed out of the mold and removed during mold opening (except for hot runner molds).
The shrinkage rate of plastics and various factors affecting the dimensional accuracy of precision mold processing, such as mold manufacturing and assembly errors, mold wear, etc. In addition, when designing compression molds and injection molds, the matching of the molding machine's process and structural parameters should also be considered. Computer aided design technology has been widely applied in plastic mold design.