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русскийMold material selection is a very important link in the whole mold making process.
Mold material selection needs to meet three principles, the mold should meet the work requirements such as wear resistance, strength and toughness, the mold should meet the process requirements, and the mold should meet the economic applicability.
conditional requirements
1. Wear resistance
When the blank is plastically denatured 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, resulting in the failure of the mold due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold.
Box injection mould
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.
2. toughness
Most of the working conditions of the mold are very harsh, and some often bear large impact loads, resulting in 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 organizational state of the material.
3. fatigue fracture performance
During the working process of the mold, under the long-term action of cyclic stress, it often leads to fatigue fracture. Its forms include small 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.
