When it comes to the selection of materials for the molds of brick machine equipment, the selection of materials is an important part of the mold manufacturing process. In simple terms, it must meet the requirements of toughness, wear resistance, corrosion resistance and other work requirements, and at the same time, it must also meet the economical application. sex. The following is an introduction to the six specific content of the selection of mold materials for the non-burning brick machine equipment:
1. Toughness: The working conditions of the mold are very poor, and some often bear large impact loads, resulting in brittle fracture. In order to prevent the mold parts from suddenly breaking during work, the mold should have high strength and toughness. The toughness of the mold mainly depends on the carbon content, grain size and organization state of the material.
2. Wear resistance: When the blank is plastically deformed in the cavity, it flows and slides along the surface of the cavity, causing violent 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 basic and important properties of the mold. Hardness is the main factor affecting wear resistance. Generally speaking, the higher the hardness of the mold parts, the smaller the wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, smallness and distribution of carbides in the material.
3. Corrosion resistance: some molds, such as plastic molds, during the working process, because the plastic contains elements such as chlorine and fluorine, after heating, it will separate and resolve strong corrosive gases such as HCI and HF, which will erode the surface of the cavity and add to the surface. Roughness causes serious wear and failure.
4. High temperature resistance: When the working temperature of the mold is high, the hardness and strength will be reduced, and the mold will be worn out early or plastic deformation will fail. Therefore, the mold material should have a higher anti-tempering stability, and the mold has a higher hardness and strength at the working temperature.
5. Resistance to cold and heat fatigue: part of the mold is repeatedly heated and cooled during the working process, so that the cavity surface is affected by stretching and pressure stress, causing the surface to break and peel, increase friction, hinder plastic deformation, reduce the size, and cause the mold Fault. Hot and cold fatigue is one of the main forms of failure of hot molds, and this mold should have high resistance to cold and heat fatigue.
6. Fatigue fracture performance: In the process of mold work, under the long-term action of cyclic stress, it often leads to fatigue fracture. 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.
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