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The main content of vacuum plastic forming mold design

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The main content of vacuum plastic forming mold design

The manufacturing of molding dies is diverse, so we also have a variety of selection processes. The following Chinese standard parts network mainly analyzes the design content of vacuum blister forming dies, including: large batch size, molding equipment, precision conditions, geometry Shape 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 must consider the dimensional stability and surface quality. For example, product design and dimensional stability require the use of molds, but products with higher surface requirements require the use of male molds, so that the plastic parts ordering party will consider these two points in order to make the products in optimal conditions. Production is carried out. 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 more stable than the size 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 mold. The dimensional tolerance of the plastic part cannot be less than 10% of the shrinkage.


4, the surface of the plastic part, 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 cleansing of the plastic parts should not come into contact with the surface of the mold. It's like using a mold to make a tub and a washtub.


5, modification, if you use a mechanical horizontal saw to saw off the clamping edge of the plastic part, in the height direction, at least 6~8 of the balance. Other finishing work, such as grinding, cutting or jetting, must also leave a margin. The gap between the cutting lines of the knife die is the smallest, and the distribution width when the punching die is trimmed is also small, which is to be noted.


6, shrinkage and deformation, plastic shrinkage (such as PE), some plastic parts are easy to deform, no matter how to prevent, plastic parts will be deformed during the cooling phase. Under this condition, the shape of the forming mold is changed to accommodate the geometric deviation of the plastic part. For example, although the wall of the plastic part remains flat, the center of the reference has deviated by 10; the base of the mold can be raised to adjust the amount of shrinkage of this deformation.


7, the amount of shrinkage, in the manufacture of Kunshan plastic molding mold must consider the following shrinkage factors. 1 The molded product shrinks. If the shrinkage of the plastic is not clearly known, it must be sampled or tested by a similarly shaped mold. Note: Only shrinkage can be obtained by this method, and the deformed size cannot be obtained. 2 shrinkage caused by the adverse effects of intermediate media, such as ceramics, silicone rubber, etc. 3 shrinkage of the material used in the mold, such as shrinkage when casting aluminum.


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