- Wear resistance
When the blank is plastically deformed in the mouldcavity, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which causes the mouldto fail due to wear. Therefore, the wear resistance of the material is one of the basic and important properties of the mould.
Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mould 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.
The working conditions of the moulds are mostly very bad, and some often bear large impact loads, which leads to brittle fracture. In order to prevent sudden brittle fracture of mould parts during work, the mould must have high strength and toughness.
The toughness of the mould mainly depends on the carbon content, grain size and organization state of the material.
3. Fatigue fracture performance
In the process of mould work, under the long-term action of cyclic stress, fatigue fracture is often caused. Its forms include low-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture, and bending fatigue fracture.
The fatigue fracture performance of the mould mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performance
When the working temperature of the mould is higher, the hardness and strength will decrease, leading to early wear of the mould or plastic deformation and failure. Therefore, the mould material should have high anti-tempering stability to ensure that the mould has high hardness and strength at working temperature.
5. Resistance to cold and heat fatigue
Some moulds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be pulled and pressure to change the stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy. mould failure. Heat and cold fatigue is one of the main forms of failure of hot work moulds, and this type of mould should have high resistance to cold and heat fatigue.
6. Corrosion resistance
When some moulds such as plastic moulds are in operation, due to the presence of chlorine and fluorine in the plastic, strong corrosive gases such as HCI and HF will be resolved after heating, which will erode the surface of the mould cavity, increase its surface roughness, and aggravate wear failure.
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