Plastic mold making process

One, the production process of plastic molds

1. Workpiece design.
2. Mold design (use software to split molds, select mold bases and standard parts, and design sliders)
3. Process arrangement.
4. Process in the order of technologists.
5. Fitter assembly (mainly with parting surface).
6. Try out the mold.

Second, the structural requirements of mold making
The principle of mold design is to ensure sufficient strength, rigidity, concentricity, neutrality and reasonable blanking clearance, and reduce stress concentration to ensure that the parts produced by the mold meet the design requirements. Therefore, the main work parts of the mold (such as the convex and concave molds of the punching die, the moving and fixed molds of the injection mold, the upper and lower molds of the forging mold, etc.) require high guiding accuracy, good concentricity and neutrality, and punching The clearance is reasonable.
When designing a mold, the following points should be considered:
① Pay attention to guiding support and centering protection when designing the punch. Especially when designing the small hole punch, the self-guided structure can be used to extend the life of the mold.
② For weak parts such as included angles and narrow grooves, in order to reduce stress concentration, circular arc transitions should be used. The arc radius R can be 3~5mm.
③ The inlay structure is adopted for the concave mold with complex structure, which can also reduce the stress concentration.
④ Increase the gap reasonably, improve the stress state of the working part of the punch, reduce the punching force, the unloading force and the pushing force, and reduce the wear of the convex and concave die edge.