What Are The Design Elements Of The Mold?
Mold design and manufacturing are closely related to plastic processing. The success or failure of plastic processing depends to a large extent on the mold design effect and mold manufacturing quality, while the plastic mold design is based on the correct plastic product design.
The structural elements to be considered in the design of plastic molds are:
(1) Parting surface, that is, the contact surface where the die and the punch cooperate with each other when the mold is closed. The choice of its position and form is influenced by factors such as product shape and appearance, wall thickness, forming method, post-processing process, mold type and structure, demolding method and molding machine structure.
(2) Structural parts, that is, sliders, inclined tops, straight top blocks, etc. of complex molds. The design of the structural parts is very critical, related to the life of the mold, processing cycle, cost, product quality and so on. Therefore, designing a complex mold core structure requires a higher level of comprehensive ability of the designer, and pursues a design that is simpler, more durable, and more economical.
(3) Mold accuracy, that is, avoiding cards, fine positioning, guide posts, positioning pins, etc. The positioning system is related to the appearance quality of the product, the quality and life of the mold. According to the different mold structure, different positioning methods are selected, and the positioning precision control mainly depends on the processing. The internal model positioning is mainly designed by the designer to design a more reasonable and easy to adjust positioning method.
(4) The gating system, that is, the feeding passage from the nozzle of the injection molding machine to the cavity, including the main flow path, the split flow path, the gate and the cold material hole. In particular, the location of the gate should be such that the molten plastic fills the cavity under good flow conditions, and the solid flow channel and gate cold material attached to the article are easily ejected from the mold and removed during mold opening. (except for hot runner molds).
(5) Plastic shrinkage and various factors affecting the dimensional accuracy of the product, such as mold manufacturing and assembly errors, mold wear, etc. In addition, when designing compression molding and injection molding, the matching of the process and structural parameters of the molding machine should also be considered. Computer-aided design techniques have been widely used in plastic mold design.
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