Features of precision casting molds:

1. Wear resistance

When the blank is plastically deformed in the mold cavity, it will flow and slide along the surface of the cavity, causing violent friction between the surface of the cavity and the blank, causing 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. Generally speaking, 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

The working conditions of the molds are mostly very bad, 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 microstructure of the material.

3. Fatigue fracture performance

In the working process of the mold, fatigue fracture often occurs under the long-term action of cyclic stress. 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 than AG, the hardness and strength will be reduced, leading to early wear or plastic deformation of the mold and failure. Therefore, the mold material should have high tempering stability to ensure that the mold has high hardness and strength at working temperature.