Design Elements Of Plastic Molds

① The parting surface refers to the contact surface between the concave and convex molds 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, forming method, post-processing technology, mold type and structure, demolding method, and forming machine structure.
② Structural components, such as sliding blocks, inclined roofs, and straight top blocks, for complex molds. The design of structural components is crucial, as it relates to the lifespan, processing cycle, cost, product quality, etc. of the mold. Therefore, designing a complex core structure of the mold requires a high level of comprehensive ability from the designer, striving for a simpler, more durable, and more economical design solution as much as possible.
③ Mold accuracy, including card avoidance, precise positioning, guide pillars, 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 control of positioning accuracy mainly relies on processing, and the internal mold positioning is mainly considered by the designer to design a more reasonable and easy to adjust positioning method.
② The pouring system refers to the feeding channel between the injection molding machine nozzle and the mold cavity, including the main flow channel, diversion channel, gate, and cold material cavity. Especially the selection of the gate position should be conducive to filling the mold cavity with molten plastic in a good flow state, and the solid runners and cold materials attached to the product should be easily ejected from the mold and removed during mold opening (except for hot runner molds).
③ Plastic shrinkage rate and various factors that affect the dimensional accuracy of products, such as mold manufacturing and assembly errors, mold wear, etc. In addition, when designing compression and injection molds, the matching of process and structural parameters of the molding machine should also be considered. Computer aided design technology has been widely applied in plastic mold design.