Insert molds are one of the more difficult types of injection mold types. Injection mold makers have to consider several different areas to complete the final mold. Insert molds can combine plastics and metals (and some other types of materials) so that the final part can connect to different parts of the final product. Custom mold makers typically have to ensure the insert mold is wear resistant, has a reduced weight, conductivity, and tensile strength.
Insert mold makers must create parts that can be molded into other plastic components. There are a wide range of applications for insert molds, such as screws, studs, pins, rivets, tubes, bushings, and surface mount pads. The custom injection molds have to be able to create parts that are more durable and sturdy than other molds because they will be used with metal, which can be very harsh on plastics.
The purpose of insert molds is to reinforce the final product. They reduce the amount of time required to assemble parts, the cost of labor, and improve the strength of the final product. As they are meant to be made of durable plastics, they also help to reduce the weight of the part.
This particular mold type follows the same process as other injection molds. The primary differences are the design and QA processes. The design has to meet strict requirements to ensure the insert will be able to function as intended. The following are the two most common considerations during the design process:
- Determine the means for holding the insert during the custom injection mold process
- Any required undercuts or bosses required to strengthen the final product
Insert molds also tend to have a more rigorous QA process to ensure the final part provides the necessary durability and strength.