The plastic solidifies in the mold cavity to form a plastic part. In order to take it out, the cavity must be opened, that is, the mold must be divided into two parts, the fixed mold and the movable mold, and the contact surface of the two parts becomes the parting surface.

Attention should be paid to the following issues when selecting parting surfaces:

The larger section of the outline dimension of the injection molded part should be selected so that the injection molded part can be taken out of the cavity smoothly.

The surface quality and appearance requirements of injection molded parts as well as the accuracy of size and shape should be guaranteed.

The parting surface should be conducive to exhaust and prevent overflow.

Should facilitate the processing of the mold and simplify its structure.

The selection of the parting surface of the plastic mold is not only related to the normal molding and demolding of the plastic part, but also affects the structure and manufacturing cost of the mold. Generally speaking, the overall selection principle of the parting surface is to ensure the quality of the plastic parts, facilitate the demolding of the parts, and simplify the mold structure.

Specifically include the following:

The parting surface should be located at the larger part of the plastic part to facilitate demoulding.

It is helpful to ensure the dimensional accuracy of plastic parts.

It helps to ensure the appearance quality of plastic parts. Try to avoid choosing parting surfaces on smooth and flat surfaces or arc curved surfaces.

As far as possible to meet the requirements of the use of injection molded products.

During the injection molding process, process defects such as demolding slope, flashing, ejection marks and gate marks are inevitable. When selecting the parting surface, try to avoid the influence of process defects on the use function of the part.