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The Choice Of The Parting Surface For Injection Mold Design
Jun 11, 2018

Core Tip: The so-called parting surface is the face that opens the mold and removes the product. The choice of parting surface is also the first step in mold design. It is affected by many factors such as the shape, appearance, wall thickness, dimensional accuracy, and number of cavity points. The general product is in hand, and the determination of the parting surface is basically no problem. For many sided core pulls, or when it comes to pillows, bumps, and piercings, it's not simple.

In general, the selection of the parting surface will follow the following principles:

 

1. Meet product release requirements

Parting surface, that is, for the product to smoothly remove the mold surface. Therefore, the location of the parting surface should be selected at the location where the product has the largest section size. This is the most basic principle.

 

2. Determination of position

When deciding the orientation of the product in the mold, the selection of the parting surface should be to prevent the product from forming side holes or side buckles, and complicated mold structures should be avoided.

 

3. The shape of the parting surface

In general products, a parting surface perpendicular to the mold opening direction of the injection molding machine is often used, and in other special cases, other shapes are used. The shape of the parting surface is based on the principle of convenience of processing and demoulding. For example, for some products that are bent, the curvature of the product may vary depending on its curvature.

 

4. Ensure product appearance and quality

The parting surface should not be selected on the smooth outer surface of the product. The appearance of the surface is generally not allowed to have clips and other lines that affect the appearance of the appearance; some products with concentricity requirements, have to concentricity requirements all on the same side, so as to ensure its concentricity.

 

5 is conducive to demoulding

The mold release mechanism of the general mold is in the moving mold, so when selecting the parting surface, the mold opening product should be left in the movable mold as much as possible. Therefore, for some places where it is possible to stick to a fixed mold, a stationary mold assisting mold release mechanism is often added.

 

6. Consider the lateral opening distance

In general, the distance of mechanical side mold opening is relatively small. Therefore, when selecting the parting surface, the direction of the core length 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.

 

7. Consideration of clamping force

The lateral clamping force of the mold is relatively small, so for a large product with a large projected area, the direction of the large projected area should be placed in the front and rear mold opening and closing mold directions, and the side projected area is smaller. Lateral typing.

 

8. conducive to exhaust

When using the parting surface as the main exhaust, the parting surface should be designed at the end of the plastic flow to facilitate the exhaust.

 

9. Mold parts easy to process

When selecting the parting surface, the mold should be divided into easy-to-machine parts, reducing the machining difficulty.

 

10.R classification

For many products, there is a full circle of R angles on the parting surface. In this case, the type R has to be taken into account and the sharp side cannot occur.