Hot extrusion is extrusion at temperatures above the recrystallization temperature. Hot extrusion technology for steel materials The rapid development was achieved after the invention of the glass lubricant extrusion method by J. Sejournet of France in 1941. When hot-squeezing steel materials, in terms of extrusion temperature, extrusion pressure, extrusion speed, lubrication conditions and methods, compared with hot extrusion of non-ferrous metals such as aluminum and aluminum alloys, copper and copper alloys, it has the following characteristics. :
1: The extrusion temperature is high, usually between 1000 and 1250 degrees Celsius.
2: The extrusion pressure is high and the working conditions of the tool and die are bad.
3: In order to prevent the tool from excessively heating during the extrusion process and affecting its strength, rapid extrusion is usually used.
4: In order to ensure high-temperature lubrication performance, glass lubricant is generally used for hot extrusion, and the product needs to be stripped of glass after extrusion.
5: Good glass lubricants can greatly improve metal flow uniformity.
In the hot extrusion of steel materials, the working conditions of the extrusion die, the core rod, the extrusion cylinder, the extrusion gasket and the like are very bad. The material used as a tool and die requires both high strength and excellent high temperature and wear resistance. The tooling materials used in actual production mainly include H13 (USA), SKD61, SKD62, SKD6 (Japan), and 2Cr2W8V (China). Due to the above characteristics, the hot extrusion production cost of steel materials is much higher than that of aluminum alloys and copper alloys.
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Post time: Aug-19-2018