Structural Factors To Be Considered In Plastic Mold Design

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, the complex mold slider, oblique top, straight top block. The design of the structural parts is very important, which relates to the life of the mould, the process cycle, the cost and the quality of the products, so the design of the complex mould core structure has a high requirement for the designer’s comprehensive ability, so as to pursue a simpler, more durable and more economical design scheme.

3. Plastic shrinkage and various factors affecting the dimensional accuracy of the product, such as mold manufacturing and assembly errors, mold wear and so on. 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.

4. Mold precision, that is, avoid card, precision positioning, guide pillars, positioning pins and so on. Positioning system is related to product appearance quality, mold quality and life, according to different mold structure, choose different positioning mode, positioning accuracy control mainly rely on processing, internal model positioning is the designer to fully consider, design a more reasonable and easy to adjust the positioning mode.

5. Gating system, that is, from the injection molding machine nozzle to the cavity between the feeding channel, including the main road, shunt, gate and cold material points. In particular, the selection of the gate location should be conducive to the melting of plastic in a good flow state filled cavity, the attached to the product of the solid flow channel and the gate cold in the mold is easy to remove from the die and clear (except Hot runner mode).

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