How does mould design and manufacture relate to plastics processing?

Mould design and manufacture are closely related to plastics processing. The success or failure of plastic processing depends to a large extent on the effectiveness of mould design and the quality of mould manufacture, while plastic mould design is based on the correct design of plastic products.

Plastic mould design to consider the structural elements are:

1, the parting surface, i.e. the contact surface where the concave mould and the convex mould fit each other when the mould is closed. Its location and form are influenced by the shape and appearance of the product, wall thickness, moulding method, post-processing process, mould type and structure, demoulding method and moulding machine structure.

2, structural parts, i.e. complex moulds with sliders, inclined tops, straight tops, etc. The design of structural parts is very critical, which is related to the life of the mould, processing cycle, cost, product quality, etc. Therefore, the design of the core structure of complex moulds requires a high comprehensive ability of the designer to pursue a simpler, more durable and more economical design solution as far as possible.

3, mould accuracy, i.e. card avoidance, fine positioning, guide pillar, positioning pin, etc.. Positioning system is related to the product appearance quality, mould quality and life, according to different mould structure, choose different positioning methods, positioning accuracy control mainly rely on processing, internal mould positioning is mainly the designer to fully consider, design a more reasonable and easy to adjust the positioning method.

4, the pouring system, i.e. from the injection moulding machine nozzle to the cavity between the feed channel, including the main flow channel, diversion channel, gate and cold material cavity. In particular, the location of the gate should be selected to facilitate the molten plastic in a good flow state full of cavity, attached to the product of the solid runner and gate cold material in the mould when the opening is easy to eject from the mould and be removed (except for hot runner mould).

5, plastic shrinkage and factors affecting the dimensional accuracy of the product, such as mould manufacturing and assembly errors, mould wear and tear, etc. In addition, when designing compression moulds and injection moulds, the process and structural parameters of the moulding machine should be considered to match. Computer-aided design techniques have been widely used in the design of plastic moulds.