What are some of the considerations for injection molding?

  • 2 months   ago

Before trying to produce a part using injection molding, consider the following:

• Financial considerations

Entry cost: Preparing a product for injection manufacturing requires a significant initial investment. Make sure you understand this crucial point from the start.

• Production quantity

Determine the number of parts produced where injection molding becomes the most cost-effective manufacturing method.

Determine the number of parts produced for which you plan to reach the breakeven point of your investment (take into account the costs of design, test, production, assembly, marketing, and distribution, as well as the sale price expected). Build on a conservative margin.

• Design considerations

Design of parts: you want to design the part from the first day, thinking about injection molding. Simplifying the geometry and minimizing the number of parts from the start will pay dividends in the future.

Tool Design - Be sure to design the mold tool to avoid defects during production. For a list of 10 common injection molding faults and how to correct or prevent them, read here. Consider the locations of the doors and run simulations using mold flow software like Solid works Plastics.

• Production considerations

Cycle time: minimize the cycle time as much as possible. The use of machines with hot runner technology will be useful, as well as well thought out tools. Small changes can make a big difference, and reducing your cycle time by a few seconds can mean huge savings when you produce millions of parts.

Assembly - Design your part to minimize assembly. Much of the reason why injection molding is done in Southeast Asia is the cost of assembling simple parts during an injection molding operation. To the extent that you can design the assembly outside of the process, with qmolding.com you will save a lot of money on the cost of labor.

• An example (design for injection molding)

Designing a part suitable for injection molding compared to a part suitable for machining, thermal forming or 3D printing means taking into account some of the differences between the different manufacturing techniques and recognizing when your project is best suited to one or the other. The typical parts you may want for the injection mold are the gaskets, the supports, or the housings. For example, most consumer electronic tools are made with injection-molded plastic housing (shell) used for the body of the tool.

One of the most obvious advantages of injection molding is that the housing serves several purposes. First, it serves as an identifier with which the end-user can interact. It also serves as a receptacle for the battery and the engine, as well as the location of the various screws that will be used to hold the device together once the internal parts are assembled. In other words, injection molding is extremely effective when you have to organize many internal parts in one case. As a result, this is a great way to reduce the total number of pieces ("number of pieces"). It should be noted that this part is also a molded part. For more information on this process, read here Injection Molding Services.


Injection molding is an excellent technology for large-scale finished production. Also useful for finished prototypes used for consumer and / or product testing. Before this advanced production stage, however, 3D printing is much more affordable and flexible for products in the early stages of design.