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乐鱼彩票网址

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characteristics of the mold

1. corrosion resistance

when some molds, such as plastic molds, 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 mold cavity, increase its surface roughness, and increase wear failure.

2. wear resistance

when the blank is plastically deformed in the mold cavity, 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 mold to fail due to wear. therefore, the wear resistance of the material is one of the most basic and important properties of the mold. hardness is the main factor affecting wear resistance. in general, the higher the hardness of the 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.

3. fatigue fracture performance

in the process of mold 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 mold 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 mold is higher, the hardness and strength will decrease, leading to early wear of the mold or plastic deformation and failure. because the mold material should have high anti-tempering stability, to ensure that the mold has a high hardness and strength at the working temperature.

5. heat and cold fatigue resistance

some molds 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 stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in mold failure. heat and cold fatigue is one of the main forms of failure of hot work molds. this type of mold should have high resistance to cold and heat fatigue.

6. strength

the working conditions of the molds are mostly very bad, and some of them are often subjected to larger impact loads, which leads to brittle fracture. in order to prevent sudden brittle fracture of mold parts during work, the mold must have high strength and toughness. the toughness of the mold mainly depends on the carbon content, grain size and organization state of the material.