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The professional manufacturing technology has undergone certain changes and developments over the years. Xiao Bian summarizes the general design rules for vacuum-molding molds. The design of vacuum suction molding mold includes batch size, molding equipment, precision conditions, geometry design, dimensional stability and surface quality.
1, the size of the batch
For experiments, when the mold yield is small, wood or resin can be used for manufacturing. However, if the experimental mold is used to obtain the finished product's data on shrinkage, dimensional stability, and cycle time, a single-row mold opening experiment should be used, and Ensure that it can be used under production conditions. Molds are generally made of gypsum, copper, aluminum or aluminum-steel alloys, and aluminum-resins are rarely used.
2, geometric design
When designing, it is often necessary to comprehensively consider dimensional stability and surface quality. For example, the product design and dimensional stability require the use of a female die (mould), but a product with a higher surface gloss requires a male die (punch die). This way, the plastic parts orderer will consider both 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. The
3, dimensional stability
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 needs to be changed due to the need of material stiffness in the future, it may cause the positive mold to be converted into a negative mold. The dimensional tolerance of plastic parts must not be less than 10% of the shrinkage rate. The
4, plastic surface
With regard to the range in which the molding material can wrap, the surface structure of the visible surface of the plastic part should be molded at the contact with the mold. If possible, the glossy surface of the plastic part should not come into contact with the surface of the mold. It's like using a female mold to make a tub and tub.
5, modification
If you use a mechanical horizontal saw to cut off the clamping edge of the plastic part, at least 6~8mm margin is required in the height direction. Other finishing tasks, such as grinding, laser cutting or jetting, must also have margins. The gap between the knife die cutting lines is the smallest, and the width of the distribution when the punching die is trimmed is also very small. These should be noted.
6, shrinkage and deformation
Plastics tend to shrink (such as PE), and some plastic parts are easily deformed. In any case, the plastic parts will be deformed during cooling. Under this condition, the shape of the forming mold is changed to adapt to the geometric deviation of the plastic part. For example: Although the plastic part wall remains flat, its reference center has deviated by 10mm; the mold base can be raised to adjust the amount of shrinkage of this deformation.
7, the amount of shrinkage
The following shrinkage factors must be taken into consideration when manufacturing plastic molding. 1 shrinkage of molded products. If the shrinkage of the plastic cannot be clearly known, it must be sampled or obtained by tests using similarly shaped molds. Note: The shrinkage can only be obtained by this method, and the deformation size cannot be obtained. 2 The shrinkage caused by the adverse effects of intermediate media, such as ceramics, silicone rubber, etc. 3 Shrinkage of the material used for the mold, such as shrinkage when casting aluminum.
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