Plastic mold to prevent deformation of the skills and methods

Plastic mold to prevent deformation of the skills and methods

Mold size accuracy

Die size accuracy to be appropriate, according to the drawings to consider the mold design, production and molding process, the key is how to ensure that the actual size of the mold in the drawings required size tolerances, which is also the designer must be solved Or it will affect the mold.

2. Shrinkage

Even if the same resin, if the molding conditions are different, then it will shrink the rate. Precision molds require shrinkage when molding rate of change is small, and the expected shrinkage and the actual shrinkage to be as much as possible, but in the actual process, generally difficult to do, usually after the mold to be modified mold. In order to better correct the size of the mold cavity plastic mold design, the shrinkage should try to take a small value, while the convex size is to take the maximum.

Prevent forming deformation

Plastic mold forming deformation, which is mainly caused by uneven contraction, the mold has internal stress, so we can take preventive measures are:

(1) the number of gates to be appropriate, the gate to maintain balance;

(2) Select the correct gate shape and location, according to the shape of the mold point of view.

3. To prevent mold release deformation

If the material shrinkage is relatively small, then pay attention when the molding pressure is high, the plastic parts easily remain in the mold cavity. In addition, the mold design should be in the case of plastic parts without demoulding to prevent deformation.