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Necessary characteristics of mold accessories

Views:5     Author:Site Editor     Publish Time: 2021-05-12      Origin:Site

With the emergence of the emerging mold industry, mold accessories stand at the top of hardware accessories due to their high precision requirements and high-quality requirements and are a hot emerging industry. Like every product, mold accessories also have their necessary characteristics. Today, Pofi precision instrument manufacturers analyze the essential elements of mold accessories for everyone.


1. Wear resistance

When the blank is plastically deformed in the mold cavity, it flows and slides along the surface of the hole, 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 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 wear resistance 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

The working conditions of the molds are mostly very bad, and some are often subjected to relatively large impact loads, resulting in brittle fractures. To prevent the mold parts from suddenly breaking 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.


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 high, the hardness and strength will decrease, leading to early wear of the mold or plastic deformation and failure. Therefore, the mold material should have high anti-tempering stability to ensure that the mold has 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, causing the surface of the cavity to be subjected to tension, pressure, and variable stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation and reducing dimensional accuracy. Cause mold failure. Heat and cold fatigue are one of the main forms of mold failure. This type of mold should have high resistance to cold and heat fatigue.


6. Corrosion resistance

When some molds such as plastic molds are in operation, due to the presence of chlorine and fluorine in the plastics, corrosive solid gases such as HCI and HF will be resolved after being heated, which will erode the surface of the mold cavity, increase its surface roughness, and aggravate wear failure.

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