The hot extrusion process used to extrude aluminum rods into aluminum profiles; hot extrusion is the earliest extrusion forming technology among several extrusion processes. It uses the characteristics of good plasticity of the material to process metal at hot forging temperature. Various extrusion moldings. At present, hot extrusion is mainly used to manufacture long parts, profiles, pipes, bars and various machine parts of ordinary equal cross-sections.
Hot extrusion can not only form non-ferrous metals and their alloys with good plasticity and relatively low strength, low and medium carbon steel, etc., but also can form high carbon and high alloy steel with higher strength, such as special structural steel, stainless steel, high-speed steel, etc. Tool steel and heat-resistant steel, etc. Since the blank must be heated to the hot forging temperature for extrusion, it is often accompanied by serious heating defects such as oxidation and decarburization, which affects the dimensional accuracy and surface roughness of the extruded parts. Generally, after machine parts are hot extruded, mechanical processing such as cutting is used to improve the dimensional accuracy and surface quality of the parts.
