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Do you know how the injection molding machine works?

Update:05-01-2021
Summary:

The Injection Machine Screw Barrel is a complicated mac […]

The Injection Machine Screw Barrel is a complicated machine that injects molten material from a reciprocating screw system into a mold to make a solid part. The machine is composed of many components; it is mainly composed of a hopper, a barrel equipped with a reciprocating screw, a temperature control device, a clamping device and the injection mold itself.
The process begins with the creation of the mold. The mold is created by the tool manufacturer according to the specifications provided to them by the designer or engineer through the 3D computer-generated model. The mold is carefully constructed so that the two halves of the mold—the mold cavity and the mold core—are separated along the parting line. After the part has cooled, it can be easily ejected from the injection molding machine. If the mold design is incorrect, the part may get stuck on the mold, which may cause damage.


Before starting the injection molding process, the specifications and components of the machine must be carefully set. The temperature and pressure will be programmed according to the size and shape of the mold and the material of manufacture of the part. Once the machine is set up, the cycle will begin, and the machine can be left unattended to perform its magic.
It works like this: the raw materials and colors are fed into the barrel of the machine through the hopper. In the barrel, the raw materials are subjected to pressure and temperature until they melt and become ductile. The reciprocating screw in the barrel will rotate to inject a precise amount of now molten plastic into the injection mold at a set and controlled temperature, pressure and speed. Once the mold is filled with molten plastic, the injection molding process is shut down. Then let the part cool down until it is ready to be removed from the mold.
This may take some time, depending on the material, wall thickness, overall size and shape of the part to be manufactured. After cooling, the mold will automatically open. The mold has a built-in ejector mechanism, and the ejector mechanism ejects parts to prepare for a new cycle. If a part of the finished part is still clamped in the mold at this time, the mold will reopen until the part is completely ejected. When the parts leave the machine, the hopper will release more raw materials and colors into the barrel, and a new cycle will begin. The autonomy of the injection molding machine means that once programmed, it can be left unattended and can run continuously during the day and night.
The basic concept of plastic molding machine has existed for more than 70 years. Since then, the original idea-injecting molten plastic into a mold-has rapidly developed into an efficient, elegant and versatile tool that can be used to make everyday objects.

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