Secondary Demolding Plastic Mold Design

How to make the mold design for this plastic part? — The slide action is interfered with by an undercut.

This is an injection mold design solution with a complicated mechanism. TONGDA LINK displays many complicated solutions for injection mold design and slide design. In this mold design concept, the customer will know how TONGDA LINK designs & manufactures this secondary demolding mold and see the mold manufacturing capability is trustworthy and the price is reasonable.

TONGDA LINK mould is a mold-making supplier with experience of around 16 years. We specialize in the automotive industry, medical devices, electronics & electrical products development, and industrial engineering, which require high-quality and high-performance plastic parts.

Here is a classic multi-action mold project for plastic mold technical experts, tooling engineers, and designers to study.

Looking at the product structure below, the two side structures will need slide actions in mold design. At the same time, one slide action has interfered with an undercut. How to design a mold to solve this problem?

Well, to solve this problem, we designed a multi-action mold. In the image below, you can see a cut-away of how the slide mechanism works. We designed a slide combo and made two slides moving orderly as we expected, one normal, one delayed. Let the small slide insert(below, we call the secondary slide), walking delay along with the main slide. When the mold opens, the main slide moves backward, and the second slide will delay a while and then follow the main slide to move downward until the undercut is demolded. Slide actions one by one. We call it multi-action mold design.

This is an industrial engineering plastic part, robust and tight tolerance. We design and build this mold for a large tier-one industrial machinery manufacturing company. This project is quite a classic mold design in multi-action mold manufacturing. A few advantages are that the slide combo is compact, functions with the ejection system, and is reliable and stable, good design practices should concern these issues.

Let`s look at the mold components of the slide combo and analyze its core action.

Usually the multi-action mold design is often used in the following two aspects:
1. The mechanism design makes a tight force to stop the slide core from pulling out. Concern about product deformation and strain during demolding, the mold designer will consider a multi-action.
2. The structure of the part decides the application of multi-action. For example, an undercut interferes with the action of the slide.
Our project is for the second application.
The essential point of designing a multi-action mold is to ensure the secondary slide’s delayed action must be safe and reliable. Otherwise, it will strain the product. Look at the below image about the disassembly of the slide combo.

We are looking at the action sequence of this secondary slide to see how we make it delay during the main slide core moving out and mold opening.
When the mold opens, the main slide moves backward under the drive of the oil cylinder, and the small slide insert moves downwards under the action of the inclined guide groove until the undercut is demolded.

This kind of product structure often appears in current engineering designs. How to design the mold is very important. We expect mold manufacturing with lower cost and higher quality. A good mold design can help achieve these points. TONGDA LINK mould has an experienced mold designing team and skilled plastic mold technicians and mold makers. We can be your reliable plastic tooling supplier. This is an excellent example of what we can do at TONGDA LINK Mold Co., Ltd. Not only does this mold generate a quality molded part, but it has also done it hundreds of thousands of times. Mold lifetime exceeds 500,000 shots. 

In this case, the mold needed to last over 500,000 cycles and run without an operator. Because of this, we built the mold to class 102 standards. The undercut and features of the mold also function automatically. This also provides the lowest piece price cost from a mold building perspective. Our factory produces high-quality plastic molds and is concerned about creating client benefits. If you have such projects requiring a plastic mold manufacturing supplier, we are glad to help.