1. Wear resistance When the blank plastically deforms i […]
1. Wear resistance
When the blank plastically deforms in the cavity of the Air Cooler Mould, it flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, thus causing the air cooler mould to fail due to wear. Therefore, the wear resistance of materials is one of the basic and important properties of mould.
Hardness is the main factor affecting wear resistance. In general, the higher the hardness of air cooler mould parts, the smaller the wear amount, and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, morphology, size and distribution of carbides in the material.
2. Strength and toughness
Most of the working conditions of air cooler mould are very harsh. Some of them often bear large impact load, which leads to brittle fracture. In order to prevent the air cooler mould parts from breaking suddenly when working, the mould must have higher strength and toughness.
The toughness of the mould mainly depends on the carbon content, grain size and microstructure of the material.
3. Fatigue fracture performance
During the working process of the air cooler mould, fatigue fracture often occurs under the long-term effect of cyclic stress. It takes the form of small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture.
The fatigue fracture performance of air cooler 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 air cooler mould is higher, the hardness and strength will decrease, resulting in early wear or plastic deformation of the mould and failure. Because the mould material should have higher tempering resistance stability to ensure the mould has higher hardness and strength at the working temperature.
5. Cold and hot fatigue resistance
The air cooler mould is in a state of repeated heating and cooling in the working process, which makes the surface of the cavity subject to tension and pressure change stress, causing surface cracking and peeling, increasing friction force, hindering plastic deformation and reducing dimensional accuracy, thus leading to failure of the air cooler mould. Cold and hot fatigue is one of the main failure modes of hot working mould. Such mould should have high cold and hot fatigue resistance.
6. Corrosion resistance
During the operation of the air cooler mould, due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases are decomposed and separated out after being heated, thus eroding the surface of the mould cavity, increasing its surface roughness and intensifying wear failure.