Types and Uses of Injection Mold Interlocks

In a plastic injection mold, we divide the mold into a core and a cavity, which are often opened and closed. In order to ensure the precision of mold closing, we usually add an interlock on the mold base. Now, let’s take a look at the types and uses of injection mold interlocks.

1. There are many types of injection mold interlocks, and the commonly used ones are side interlocks, tapered interlocks and angled square interlocks, etc.

(1) Side Interlocks

side lock for injection mold

(2) Tapered Interlocks

Tapered Interlocks

(3) Angled Square Interlocks

Angled Square Interlocks

2. Choice of Interlock Locations

Usually, a set of plastic injection mold is added with 4 side interlocks. The best location of the side interlocks is shown in the following figure, i.e., in the middle of the four edges. Due to the radioactive temperature difference between the core and the cavity, the thermal expansion and contraction are different. When the mold is closed, the side will be burnt. Therefore, placing it in the middle location is able to effectively avoid this problem.

side interlocks location in injection mold

3. Choice of Interlock Locations

When there is a slide, eyebolt hole or other structures in the middle location, which might interfere with the location of the side interlock, the side interlocks can be relocated and placed diagonally, as shown in the figure:

side lock location

4. Choice of Interlock Locations

When there are slides on the four sides of the mold base, leaving no space for the side interlocks, you can choose the tapered or the angled square interlock, as shown below:

Tapered Interlocks in cavity side
Tapered Interlocks in core side

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