Because different mould has been applied in many fields, and the manufacturing technology of professional mold in these years there are changes of development, so in this part, summed up the general rules for the design of vacuum forming mould.
The design of vacuum forming mold includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality.
1, batch size experiments, mold output hours, wood or resin can be used for manufacturing. However, if the die is used to obtain the data about shrinkage, dimensional stability and cycle time, it is necessary to use the single cavity mold to test and ensure that it can be used in the production conditions. The mold is usually made of plaster, copper, aluminum or aluminum steel alloy, rarely used aluminum - resin.
2, geometric design, design often consider the dimensional stability and surface quality. For example, product design and dimensional stability requirements by die (die), but the surface products require a high gloss mold is required (punch), so that the plastic parts of the ordering party will consider these two points, so that the products can be produced under optimal conditions. Experience has proved that designs that do not conform to actual processing conditions are often failure.
3, the dimension is stable, in the molding process, the plastic parts and mold contact surface than leave the mold part of the dimensional stability is better. If the day after due to the stiffness of the material required to change the material thickness, may lead to male into female die. The dimensional tolerance of plastic parts should not be less than 10% of the shrinkage.
4, the surface of plastic parts, the forming material can cover the scope of the plastic parts can meet the surface structure should be in contact with the mold molding. If possible, do not touch the mold surface. It's like making a bathtub and a tub with a die.