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Structural elements and accessory requirements to be considered in the design of plastic molds?

Update:23-06-2022
Summary:

Chair mould plastic mould will have a close relationshi […]

Chair mould plastic mould will have a close relationship with plastic processing in the process of design and manufacture. The success or failure of plastic processing depends to a large extent on the effect of mould design and the quality of mould manufacturing, and the design of plastic mould is based on the correct plastic products. Design based.
The structural elements to be considered in the design of plastic molds are:
①Parting surface, that is, the contact surface where the die and the punch cooperate with each other when the die is closed. The selection of its position and form is affected by factors such as product shape and appearance, wall thickness, molding method, post-processing technology, mold type and structure, demoulding method and molding machine structure.
②Structural parts, that is, sliders, inclined tops, straight top blocks, etc. of complex molds. The design of structural parts is very critical, which is related to the life of the mold, processing cycle, cost, product quality, etc. Therefore, designing a complex mold core structure requires a higher comprehensive ability of the designer, and pursues simpler, more durable and more economical as far as possible. Design.
③Mould accuracy, that is, card avoidance, precise 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 structure of the mold, different positioning methods are selected. The positioning accuracy control mainly depends on the processing. The internal mold positioning is mainly considered by the designer to design a more reasonable and easy-to-adjust positioning. Way.
②Gating system, that is, the feeding channel from the injection molding machine nozzle to the cavity, including the main channel, the runner, the gate and the cold material cavity. In particular, the selection of the gate position should help the molten plastic to fill the cavity in a good flow state, and the solid runner and gate cold material attached to the product can be easily ejected from the mold and removed when the mold is opened.
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 molds 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 used in plastic mold design.
Thin wall mold needle, punch, guide post, guide sleeve, precise positioning, ejector pin, thimble, cylinder, slider device, lifter device, steel ball sleeve, date stamp, plastic mold spring, sealing ring, cooling joint, water column Plugs, positioning rings, sprue sleeves, pull pins, tie rods, limit pins, garbage pins, support columns, shutters, mold opening sequence controllers (clamping components), etc.

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