Hot work molds are mainly used for hot deformation processing and pressure casting molds. They are widely used in the industry and have very high requirements. Hot work die steel includes hammer forging dies, hot extrusion dies, die casting dies and hot punching dies, etc. According to different types, the requirements for the use of functions are also different.
When the hammer forging die is operated, it is subjected to a lot of pressure and impact load, and the impact frequency is very high. The surface of the die cavity is continuously heated by high-temperature metal, which can make the die heat up to 300°C to 400°C, and some temperatures reach 500°C～600℃.
The functional requirements of the hammer forging die for the die steel are: high hardness and good resistance; good wear resistance and thermal fatigue resistance; due to the relatively large size of the die, it should have high hardenability.
The working conditions of the hot extrusion die are relatively poor, and it is subjected to compressive force and bending force at the same time. It also receives a certain tensile stress when demoulding, and is also subjected to the effect of impact load; the contact time between the die and the high-heat metal is longer, so that the heating temperature is higher than that of the hot extrusion die. Hammer forging dies are hotter.
The functional requirements of hot extrusion die for die steel are: high thermal stability, excellent thermal fatigue resistance, high high temperature resistance and sufficient resistance.
The failure modes of die casting molds include thermal fatigue cracking, thermal wear and thermal erosion.
The functional requirements of die-casting molds for die steel are: high heat resistance and excellent high temperature mechanical properties; excellent cold and heat fatigue resistance and high thermal conductivity; excellent oxidation resistance and corrosion resistance; Has high hardenability. The hardness of the die is 56 to 60HRC, but high resistance is required.
The hot punching die is composed of an edge-cutting die and a punch. During edge-cutting, the punch has no cutting edge and only has a force transmission effect. The failure modes are edge wear, chipping, curling, etc.
The functional requirements of hot punching die for die steel are: high wear resistance, high hardness and hot hardness; in order to prevent chipping, it should have a certain degree of resistance; it should have excellent craftsmanship.
In the process of production and processing, hot work molds need to be heated and cooled repeatedly. In the state of cold and hot, it is easy to cause thermal fatigue cracks on the working surface of the mold. When other hot metals are forcibly deformed, they will rub against the surface of the mold cavity and the mold It is very easy to wear and the hardness is reduced, so the operation process is also relatively strict!
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