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What are the requirements for injection molds?

The working conditions of Plastic Injection Moulding are as follows:

1. Wear resistance

When the blank is plastically deformed in the cavity of the injection mold, it both flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, resulting in the failure of the injection mold due to wear. Therefore, the wear resistance of the material is one of the basic and important properties of the injection mold. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the injection mold parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.

2. Heat and cold fatigue resistance

SomeChina Plastic Injection Moulding suppliers

are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be subjected to tension, pressure and stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing size. accuracy, resulting in injection mold failure. Hot and cold fatigue is one of the main forms of failure of hot work injection molds. This type of injection mold should have high resistance to cold and heat fatigue.

3. Corrosion resistance

When some injection molds such as plastic molds are working, due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases such as HCI and HF are decomposed after heating, which erodes the surface of the injection mold cavity, increases its surface roughness, and aggravates wear. invalid.

4. Strong toughness

Most of the working conditions of injection molds are very harsh, and some often suffer from large impact loads, resulting in brittle fracture. In order to prevent the sudden brittleness of the injection mold parts during operation, the injection mold must have high strength and toughness. The toughness of the injection mold mainly depends on the carbon content, grain size and organizational state of the material.

5. Fatigue fracture performance

During the working process of the injection mold, fatigue fracture is often caused under the long-term action of cyclic stress. Its forms include small-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of an injection mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.

6. High temperature performance

When the working temperature of the injection mold is high, the hardness and strength will decrease, resulting in early wear of the injection mold or plastic deformation and failure. Therefore, the injection mold material should have high anti-tempering stability to ensure that the injection mold has high hardness and strength at working temperature.



Post time: Apr-08-2023