WhatsApp: +86 19166273143 | emma.tan@tkbkl.com


Home - Blog - how to make a plastic injection mold

how to make a plastic injection mold

Date: 2023-4-26

Plastic injection molding is a manufacturing process that involves creating a mold, injecting plastic into the mold, and cooling the plastic to create a solid object. This process is commonly used to create a wide range of plastic products, including toys, medical devices, automotive parts, and more.

If you are interested in making a plastic injection mold, there are several steps you will need to follow. In this article, we will discuss the process for creating a simple plastic injection mold.

Step 1: Design the Mold

The first step in making a plastic injection mold is to design the mold. This involves creating a 3D model of the part you want to produce, and then designing the mold around that part.

There are many CAD (computer-aided design) software programs available that can help you create a mold design. Some popular options include SolidWorks, AutoCAD, and CATIA.

When designing the mold, you will need to consider factors such as the part geometry, material type, injection molding machine size, and more. It is important to make sure that the mold is designed to produce parts that meet your specifications.

Step 2: Create a Mold Base

Once you have designed the mold, the next step is to create a mold base. The mold base is the foundation of the mold, and it provides support for the various mold components.

To create the mold base, you will need to machine a block of metal (such as aluminum or steel) to the dimensions specified in your mold design. This block will serve as the base for all of the other mold components.

Step 3: Add Mold Components

After the mold base is created, you can begin adding the various mold components. These components include the mold cavity, core, ejector pins, and more.

The mold cavity is the space where the plastic is injected and forms the part. The core is the part of the mold that creates any internal features of the part. Ejector pins are used to push the finished part out of the mold.

Each mold component must be carefully designed and machined to fit precisely within the mold base.

Step 4: Install the Mold on an Injection Molding Machine

Once the mold is complete, it can be installed on an injection molding machine. The injection molding machine will heat the plastic to a specific temperature, inject it into the mold, and then cool it to create a solid part.

When installing the mold on the injection molding machine, it is important to ensure that all of the mold components are properly aligned and secured.




Step 5: Test the Mold

After the mold is installed on the injection molding machine, it is important to test it to ensure that it is working properly. This involves running a few test shots to check for any issues with the mold or the injection molding process.

If there are any issues, adjustments may need to be made to the mold or the injection molding machine settings.

Step 6: Produce Parts

Once the mold has been tested and any necessary adjustments have been made, you can begin producing parts. The injection molding machine will inject plastic into the mold, and the mold will create a solid part.

Depending on the size of the mold and the complexity of the part, the injection molding process can take anywhere from a few seconds to several minutes.


Making a plastic injection mold is a complex process that requires careful planning and attention to detail. By following the steps outlined above, you can create a simple plastic injection mold that will produce high-quality parts.

Remember to take your time and ensure that each component of the mold is designed and machined to the correct specifications. With practice and experience, you can become an expert at making plastic injection molds and producing high-quality plastic parts.

Latest News