What are the requirements of the Chair Mould in the pro […]
What are the requirements of the Chair Mould in the processing process, please welcome the chair mould manufacturer to introduce to you below:
1. Wear resistance
When the blank plastically deforms in the cavity of the plastic chair mould, it flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, thus causing the plastic chair mould to fail due to wear. Therefore, the wear resistance of materials is one of the basic and important properties of chair mould. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the chair 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 chair moulds are very harsh, and some of them often bear large impact load, which leads to brittle fracture. In order to prevent the chair mould parts from breaking suddenly when working, the chair mould should have higher strength and toughness. The toughness of chair mould mainly depends on the carbon content, grain size and microstructure of the material.
3. Fatigue fracture performance
During the working process of the chair mould, fatigue fracture often occurs under the long-term action 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 chair 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 chair mould is higher, the hardness and strength will decrease, resulting in early wear or plastic deformation of the chair mould and failure. Because the chair mould material should have higher tempering resistance stability to ensure the chair mould has higher hardness and strength at the working temperature.
5. Cold and hot fatigue resistance
Some chair mould are repeatedly heated and cooled during the working process, which makes the surface of the cavity subject to tension and pressure change stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation and reducing dimensional accuracy, thus causing chair mould to fail. Cold and hot fatigue is one of the main forms of hot-working chair mould effect. Help this kind of chair mould should have high cold and hot fatigue resistance.
6. Corrosion resistance
When some plastic chair mould, such as plastic moulds, work, due to chlorine, fluorine and other elements in the plastic, strong corrosive gases such as hci, hf and the like are decomposed and separated out after being heated, thus eroding the surface of the cavity of the chair mould, increasing the surface roughness thereof and aggravating wear failure.