Extrusion, especially cold extrusion, has high material utilization rate, improved material structure and mechanical properties, simple operation, high productivity, and can produce long rods, deep holes, thin walls, special-shaped profiles and other parts, which is an important The less cutting process. Extrusion is mainly used for metal forming, but also for non-metal forming of plastic, rubber, graphite and clay blanks. In the 17th century, the French used a manual screw press to squeeze lead pipes. Lead pipes were used as water pipes and the cold extrusion process began. The cold extrusion of zinc, copper and copper alloys was realized at the end of the 19th century and expanded to the cold extrusion of aluminum and aluminum alloys in the early 20th century. In the 1930s, the Germans invented the phosphating and saponification surface antifriction lubrication treatment technology, and successfully realized the cold extrusion of steel. After the Second World War, the cold extrusion of steel expanded to other countries and expanded its application range. Since the glass liquid lubrication method was adopted in the 1950s, the hot extrusion technology of steel has been applied and developed in metallurgy, machinery and other industries.
