1. Consideration of clamping force
The lateral clamping force of the mold is relatively small, so for large products with a large projected area, the direction with the large projected area should be placed in the direction of front and rear mold opening and closing, and the direction with the small projected area as the side to type.
2. Conform to product demoulding requirements
The parting surface is also for the product to be taken out of the mold smoothly. Therefore, the position of the parting surface should be selected at the part with the largest cross-sectional size of the product, which is the most basic principle.
3. The shape of the parting surface
Ordinary products often use a parting surface perpendicular to the mold opening movement direction of the injection molding machine, and only use other shapes of parting surfaces in special cases. The shape of the parting surface is based on the principle of facilitating processing and demoulding. Like a curved product, the parting must be based on its curved curvature.
4. Ensure product appearance and quality
The parting surface should not be on the smooth outer surface of the product. Generally speaking, clip lines and other lines that affect the appearance are not allowed to appear on the appearance surface; for some products that require concentricity, all parts that require concentricity must be placed on the same side, so as to ensure their concentricity.
5. Determination of orientation
When determining the orientation of the product in the mold, the selection of the parting surface should try to prevent the product from forming side holes or side buckles, and complex mold structures should be avoided.
6. Facilitate demoulding
The demoulding mechanism of the general mold is on the moving mold, so when selecting the parting surface, the product should stay in the moving mold as much as possible after the mold is opened. Therefore, for some places that may stick to the fixed mold, we often add a fixed mold auxiliary demoulding mechanism.
7. Consider the lateral mold opening distance
Generally, the distance of lateral mechanical mold opening is relatively small. Therefore, when selecting the parting surface, the direction of the long core-pulling distance should be selected in the direction of opening and closing of the front and rear molds, and the short direction should be used as the side parting.
8. Mold parts are easy to process
When selecting the parting surface, the mold should be divided into easy-to-process parts to reduce the difficulty of machining.
9. Good for exhaust
When the parting surface is used as the main exhaust, the parting surface should be designed at the end of the plastic flow to facilitate exhaust.
10. R type
For many products in mold design and parting, there is a full circle of R angles on the parting surface. At this time, the parting must take into account the best parting of R, and no sharp side can appear.
