Design principle of mold(1)

Design principle
Because different forming molds have been applied in many fields, and the manufacturing technology of professional molds has also changed and developed in recent years, in this part, the general design rules of vacuum forming molds are summarized.
The design of vacuum forming mold includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality.
1. The batch size is used for experiments, the mold output is small, and wood or resin can be used for manufacturing. However, if the experimental mold is to obtain data about shrinkage, dimensional stability and cycle time of the product, a single cavity mold should be used for the experiment, and it can be guaranteed to be used under production conditions. Molds are generally made of plaster, copper, aluminum or aluminum-steel alloys, and aluminum-resin is rarely used.
2. Geometric shape design, when designing, dimensional stability and surface quality are often considered comprehensively. For example, product design and dimensional stability require the use of female molds (concave molds), but products that require high gloss on the surface require the use of male molds (punch molds). point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual machining conditions often fail.
3. Dimensional stability. During the molding process, the surface of the plastic part in contact with the mold has better dimensional stability than the part that leaves the mold. If the material thickness needs to be changed in the future due to the material stiffness, it may result in the conversion of the male mold to the female mold. The dimensional tolerance of plastic parts cannot be less than 10% of the shrinkage.