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10 Principles of Parting Surface Design of Injection Mold

1. Meeting the requirements of demolding
The parting surface is the surface which is convenient for the product can be taken out successfully. Therefore, the position of parting surface should be selected at the part with the largest product section size. This is a basic principle.

2. Convenient for demolding
In General, the demolding mechanism of mold is located at the side of movable mold. Therefore, when selecting the parting surface, the injection molded part after mold opening should be left as far as possible in the movable mold. Therefore, for some places where it is possible to stick to the fixed mold, we often add a fixed mold assisted demolding mechanism.

3. The shape of parting surface
Products generally use the parting surface which is perpendicular to the direction of the mold opening movement of injection molding machine. The parting surface of other shapes is used only in special cases. The shape of parting surface is based on the principle of easy processing and demolding. Such as the curved product, the design of the shape of parting surface must be based on the curvature of its bending.

4. Ensure product appearance and quality
The parting surface can't be designed on the smooth outer surface of product. In general, the appearance surface is not allowed to have lines and other lines that affect the appearance of aesthetics. For some products with concentricity requirements, all parts with the same degree of concentricity must be placed on the same side, so as to ensure their concentricity.

5. Convenient for exhaust
When parting surface is used as the main exhaust, the parting surface should be designed at the end of plastic flow to facilitate the exhaust.

6. Meet the requirements of clamping force
The lateral clamping force of mold is relatively small. Therefore, for the large product with a large projection area, the direction of large projection area should be placed in the direction of the front and rear mold opening and closing, and the small side projection area is used as lateral parting. 

7. Determination of position
When determining the orientation of the product inside the mold, the selection of parting surface should try to prevent the product from forming side holes or side buckles. Complex mold structures should be avoided.

8. Mold parts are easy to process
When selecting parting surface, the mold should be divided into parts that are easy to machine, reducing the difficulty of machining.

9. Considering the lateral mold opening distance
In general, the distance of lateral mechanical mold opening is relatively small. Therefore, when selecting parting surface, the direction in which the core distance is long should be selected in the direction in which the front and rear molds are opened and closed, and the short direction is used as the lateral parting.

10. R parting surface
For parting surface design of injection mold, many products have a full circle of R angles at the parting surface. In this case, it is necessary to consider that the R best parting surface can’t appear on the sharp side.

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