The mold is designed to be demolded without deformation of the plastic part

In addition, the mold is designed to be demolded without deformation of the plastic part to prevent deformation. The main cause is shrinkage unevenness and internal stress in the mold. (2) Shrinkage rate Even if it is the same resin, if the molding conditions are different, its shrinkage rate will be different. 2.. When the precision mold is formed, the shrinkage change rate is required to be small, and the expected shrinkage rate and the actual shrinkage rate are as much as possible, but in the actual process, it is generally difficult to do, and the mold is usually corrected after the test.

Therefore, the preventive measures we can take are as follows: (1) The number of gates should be appropriate. Prevent demoulding from deformation If the shrinkage of the material is relatively small, it should be noted that when the molding pressure is high, the plastic part is likely to remain in the cavity. Prevent the deformation deformation of the plastic mold of Huangjiang from forming deformation. In order to better correct the mold, when designing the size of the concave part of the plastic mold, the shrinkage rate should be as small as possible, and the size of the convex part should be taken as the maximum value. The mouth should be balanced; (2) choose the correct gate shape and position, depending on the shape of the mold. 3.How to prevent deformation of plastic mold

How to prevent the deformation of plastic molds (1) mold size accuracy mold size accuracy should be appropriate, according to the drawings to consider the mold design, production and molding process, the key is how to ensure the actual mold size required in the drawings Within the dimensional tolerances, this  China Auto bumper mould is what the designer must solve, otherwise it will affect the mold