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.