Mon May 22 15:32:05 CST 2023
In general, mold parts are usually made of tungsten steel, high speed steel, bearing steel, stainless steel, brass, metal alloy, spring steel, carbonized steel, etc.
What are the characteristics of mold parts?
1. Wear resistance
The first is good wear resistance, because in the mold cavity, the blank flows along the surface of the cavity when shaping, it will make the surface of the cavity and the blank violent friction between the two, too much wear will lead to mold failure. Therefore, having good wear resistance is one of the most basic and important properties of the material. As we all know, the amount of wear is generally affected by the hardness of the mold part, the higher the hardness, the less the wear and the better the anti-friction performance. In addition, to have good wear resistance, the number, form, quantity, size and distribution of carbides in the material should be considered.
Toughness is also an important influence factor. We all know that the use of the mold environment is mostly harsh, need to withstand a large impact load, if there is no good toughness, there will be brittle fracture situation. Avoid this situation, the mold itself should have good strength and toughness. In addition, the toughness of the mold is determined by the carbon content, grain size and tissue state of the material.
3. Fatigue fracture performance
In addition to the above two characteristics, the use of the mold, due to the long-term role of cyclic stress, easy to appear fatigue fracture situation. Generally manifested as 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.
4. High temperature performance
The temperature during use will also make the hardness and strength of the mold drop, when the ambient temperature is too high, it will make the hardness and strength drop, appearing mold early wear or plastic deformation and failure. Therefore, the mold material also needs to have good tempering resistance stability.
5. Corrosion resistance
Corrosion resistance is also worth mentioning, for example, plastic mold in the use of the process will be volatile HCI, HF and other corrosive gases, corrosion of the mold cavity surface, thus making its surface smoothness decline.
6. Hot and cold fatigue resistance
Finally, part of the mold in the use of the process will always be in the heating and cooling alternate state, which will make the cavity surface by the role of tensile, pressure variable stress, causing surface cracks and spalling, friction resistance increases, affecting the plastic deformation of the material, reducing precision. Therefore, with good resistance to cold and heat is also mold parts need to have.