Team Rapid Manufacturing Co., Ltd

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Insert Molding
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Insert Molding
Including one or more metal inserts in a plastic part by Insert Molding

What is Insert Molding?


Insert Molding

Insert molding is an injection molding process used to insert metal part into a plastic to create a final plastic component. There are 2 basis steps of this process: Firstly, getting ready the metal part, loading it onto the mold before molding. Secondly, injecting the molten plastic into the cavity, cooling down and take out the final plastic component. Applications for insert molding is widely, one of the common application is used to thread brass insert to create a rigid thread in a plastic part, due to the inserts can be just about anything, from alloy threads to electrical contacts, the application possibilities are seemingly endless. It is important to understand the insert molding process, then design the part correctly to optimize the production process. For planing a insert molding project and production? Contact us to get a free design for manufacturability report. 




Benefits of Insert Molding 


1. Improved the part's strength.

2. Inserts can offer strong and reliable attachment points for assembly.

3. Comparing with other inserting processes, insert molding is more cost effective.

4. No significant mold structure changes.

Applications of Insert Molding


Types of Inserts 


Types of Inserts

Most commonly, the purpose of insert molding is to fastening and locating plastic parts with other assemblies by inserts. It is also common to have different kinds of inserts in one single injection molded part. The following is a list of some most common types of inserts. TEAM Rapid offers CNC machining service to make your custom insert fast and cost-effectively.


1. Male Threads

2, Female Threads

3, Dowel Pins

4, Spring-Loaded Clips

5, Electrical Contacts 



Considerations of Insert Molding


TEAM Rapid helped lots of customers made their insert molded parts sucessfully in the past  10 years. Before kicking off the insert molding project, we always takes the following major considerations from a manufacturer perspective:


Type of Insert Molding1, The insert - it needs to be strong enough to withsand the injection molding temperature and pressure.

2. The mold - inserts need to be held firmly in place during injection. We takes full considerations about the inserts location at mold design, ensure the insert can be placed easily and good for following production.

3. The fitting - insert needs to fit perfectly onto the cavity, especially for the touched surfaces, they need to be mated well to guarantee the sealing. If sealing is not not, the part will come out with flashes easily. The touched/sealing surfaces need to be precised, and every insert need to have stable tolerance on the surfaces. Varies from the injection materials, when injecting ABS, the tolerance of sealing surfaces should be +/-0.05mm, and +/-0.02 mm for pp material. For the touched surfaces, avoiding to using radius and complex curved surfaces as sealing, and the sealing areas should be as large as possible.

4. The production - inserts can be loaded by hand of automatically by robotics. For small volume insert molded parts, we usually suggest the customer the way of loading insert by hand, the investment can be cut down by this way.


Email us at sales@teamrapidtooling.com to see how we build your insert molded parts.



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