Hot extrusion mould
Hot extrusion die refers to a mold that directly extrudes hot metal into various profiles, profiles or tubes.
The working conditions of the hot extrusion die are quite harsh, subject to compressive stress and bending stress, and also subjected to a certain tensile stress during demolding. It is also affected by the impact load. The contact time between the mold and the hot metal is longer, which makes the heating temperature higher than that of the hot forging die. Especially when used for processing steel materials and refractory metals, the working temperature is as high as 600-800 ° C. The failure mode of the hot extrusion die is mainly Excessive plastic deformation, cracking, thermal fatigue and thermal wear of the cavity.
The steel for hot extrusion die is generally smaller than the hot forging die. Therefore, it is particularly required for such a mold to have high thermal stability, high high temperature strength and sufficient toughness, good heat fatigue resistance and high resistance. Grinding.
Commonly used steels for hot extrusion die are tungsten hot work die steel and chromium hot work die steel, as well as new hot work die steels such as chromium molybdenum, tungsten molybdenum and chromium molybdenum tungsten, and base steel.
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