Because different molding dies have been applied in many fields, and the manufacturing technology of professional dies has also undergone certain changes in these years, in this part, the general design rules of vacuum blistering dies are summarized.
The design of vacuum forming molds includes batch size, molding equipment, precision conditions, geometric design, dimensional stability and surface quality.
1. The size of the batch is used for experiments. When the mold output is small, it can be made of wood or resin. However, if the experimental mold is used to obtain data on shrinkage, dimensional stability, and cycle time of the product, a single cavity mold should be used for the experiment and it can be used under production conditions. Molds are typically made of gypsum, copper, aluminum or aluminum-steel alloys, and aluminum-resins are rarely used.
2, geometric shape design, design, often have to consider the dimensional stability and surface quality. For example, product design and dimensional stability require the use of a female mold (female mold), but the surface requires a higher gloss product, but requires the use of a male mold (protrusion), so that the plastic parts ordering party will take into account these two Point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual processing conditions often fail.
3, the size is stable, in the molding process, the surface of the plastic part in contact with the mold is better than the dimensional stability of the part leaving the mold. If the material thickness is required to change in the future due to the material stiffness, it may result in the conversion of the male mold to the negative mold. The dimensional tolerance of the plastic part cannot be less than 10% of the shrinkage.
4, the surface of the plastic parts, in terms of the range in which the molding material can be wrapped, the surface structure of the visible surface of the plastic part should be formed at the contact with the mold. If possible, the clean side of the plastic part should not come into contact with the mold surface. It's like using a female mold to make a tub and a laundry tub.
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