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What is an injection mold? Today I will tell you thoroughly that thousands of products are produced (Part 3)

Individual molded parts often have special names. The molded parts that make up the shape of the product are called concave molds (also called female molds), and the parts that make up the internal shapes of the products (such as holes, grooves, etc.) are called cores or punches (also called male molds). When designing molded parts, the overall structure of the cavity must first be determined based on the properties of the plastic, the geometry of the product, dimensional tolerances and usage requirements.
The second step is to select the location of the parting surface, gates and vents as well as the demoulding method according to the determined structure.

Finally, the parts are designed according to the size of the control product and the combination of the parts is determined. The plastic melt has high pressure when entering the mold cavity, so the molded parts must be reasonably selected and their strength and stiffness checked.

In order to ensure that the surface of plastic products is smooth, beautiful and easy to demould, all surfaces in contact with plastics must have a roughness Ra>0.32um and must be corrosion-resistant. Formed parts are generally heat treated to increase hardness and made of corrosion-resistant steel.

Temperature control system

In order to meet the mold temperature requirements of the injection process, a temperature adjustment system is required to adjust the temperature of the mold. For injection molds for thermoplastic plastics, the cooling system is mainly designed to cool the mold. The common way to cool the mold is to open a cooling water channel in the mold and use the circulating cooling water to take away the heat of the mold. In addition to using hot water or steam in the cooling water channel, the heating of the mold can also be done by installing electricity inside and around the mold. Heating element.

Molded parts
It refers to the various parts that make up the shape of the product, including the movable mold, the fixed mold and the cavity, the core, the forming rod and the exhaust port. The molded part consists of a core and a die. The core forms the inner surface of the product, and the die forms the outer surface shape of the product. After the mold is closed, the core and cavity form the cavity of the mold. According to the process and manufacturing requirements, sometimes the core and the die are composed of several pieces, sometimes they are made as a whole, and inserts are only used in parts that are easily damaged and difficult to process.

exhaust vent
It is a groove-shaped air outlet opened in the mold to discharge the original gas and the gas brought in by the melt. When the molten material is injected into the mold cavity, the air originally existing in the mold cavity and the gas brought in by the melt must be discharged out of the mold through the exhaust port at the end of the material flow. Otherwise, the product will have pores, poor connections, and The mold filling is not satisfactory, and the accumulated air may even burn the product due to high temperature caused by compression.

Chris

Greetings! I’m Chris, deeply fascinated by mechanical parts and engineering. Let’s embark on a journey through design, functionality, and innovation in the hardware world.

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