What are the design principles of blow moulds?
1. The geometry of the blow mould design principles:
In the design of blow mould, we should be on the mould of the dimensional stability and surface quality to be considered.
2. Dimensional stability of blow moulds:
Blow moulds in the moulding process, should ensure that plastic and mould contact area than the mould part of the required dimensional stability required. If it is necessary to change the thickness of the material as required in the subsequent production process, it may be necessary to convert the male mould into a female mould. The dimensional tolerances of the blow mould should be no less than 10% of the shrinkage.
3. Modification of blow mould:
If the clamping of the plastic parts of the use of mechanical horizontal saw saw off, the height should be left at least 6-8 mm margin. For other renovation work, should also be based on the need for a certain amount of stay. Also note that the gap between the cutting edge of the die is relatively small, then the punching die should be modified when the width of the distribution should be as little as possible.
Four. Blow mould shrinkage and deformation:
Plastic mould is more prone to shrink the phenomenon, then the ability to deformation is relatively large. For this case we can only rely on the shape of the blow mould to change after selecting the appropriate geometric deviation.
V. shrinkage of blow mould:
In the case of manufacturing a plastic mould, the shrinkage factor should be taken into account. Including: the contraction of the moulded article of the injection mould; the adverse effect of the intermediate medium on the shrinkage; the shrinkage of the material used to blow the mould.