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Mould Design One Of The Performance
Jun 27, 2017

When the blank is deformed in the mold cavity, it flows and slides along the cavity surface, causing severe friction between the cavity surface and the blank, Mould Design which causes the mold to fail due to wear. So the wear resistance of the material is one of the most basic and most important performance of the mold. Hardness is the main factor affecting wear resistance. Under normal circumstances, Mould Design the higher the hardness of mold parts, the smaller the wear, wear resistance is also better. Mould Design In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.

Mold working conditions are mostly very bad, Mould Design and some often bear a greater impact load, resulting in brittle fracture. In order to prevent the mold parts in the work suddenly brittle, mold to have a high strength and toughness. The toughness of the mold depends mainly on the carbon content of the material, grain size and tissue state.

Mold work in the process, the long-term role in the cyclic stress, often lead to fatigue fracture. Its form has a small energy multiple impact fatigue fracture, Mould Design tensile fatigue fracture contact fatigue fracture and bending fatigue fracture. The fatigue fracture properties of the mold are mainly determined by its strength, toughness, hardness, and the content of inclusions in the material.

When the mold temperature is higher, Mould Design will make the hardness and strength decreased, resulting in early wear or deformation of the mold and failure. Due to the mold material should have a high resistance to tempering stability, to ensure that the mold at the operating temperature, with a high hardness and strength.

Some molds are in the process of repeated heating and cooling, so that the surface of the cavity by the tension, the role of stress stress, causing the surface cracking and peeling, Mould Design increased friction, blocking plastic deformation, reducing the size of the accuracy, resulting in Mold failure. Hot and cold fatigue is one of the main forms of hot die failure, to help this type of mold should have a high resistance to hot and cold fatigue properties.

Some molds such as plastic mold at work, Mould Design due to the presence of chlorine in the plastic, fluorine and other elements, heat decomposition after decomposition hci, hf and other strong corrosive gases, erosion mold cavity surface, increase its surface roughness, exacerbate wear failure.

Mold manufacturing generally have to go through forging, cutting, Mould Design heat treatment and other processes. In order to ensure the quality of mold manufacturing and reduce the production cost, the material should have good malleability, machinability, hardenability, Mould Design hardenability and grindingability. It should also have small oxidation, decarburization sensitivity and quenching Deformation Cracking tendency.

In the selection of molds, we must consider the principle of economy, as much as possible to reduce manufacturing costs. Therefore, to meet the use of performance under the premise of the first choice of lower prices, can use carbon steel without alloy steel, can use domestic materials do not have imported materials. In addition, the selection should also consider the market's production and supply situation, Mould Design the selected steel should be as small as possible and easy to buy.