Rolling mill is the main machine of direct rolling metal. It uses rotating roll to roll billets to produce plastic deformation of metal according to the specified requirements. Rolling is a metal forming method with high productivity and low cost, which is suitable for rolling strip or plate material with the same cross section or periodic changes. Special rolling mills can roll machine parts or their blanks as well as certain non-metallic materials. The rolling mill mainly has two ways of hot rolling and cold rolling, usually the rolling process with the rolling temperature above the metal recrystallization temperature is called hot rolling, and the rolling process below the metal recrystallization temperature is called cold rolling. This paper mainly introduces the cold rolling process.
Cold rolling with hot-rolled steel coil as raw material, after pickling to remove the oxide, cold continuous rolling, the finished product is rolled hard coil, because of the cold hardening caused by continuous cold deformation, the strength and hardness of rolled hard coil increase, toughness and plastic index decline, so the stamping performance will deteriorate, can only be used for simple deformation parts. Rolled hard coil can be used as raw material in hot dip galvanizing plant, because hot dip galvanizing units are equipped with annealing lines. The rolled hard coil weight is generally 6~13.5 tons, and the steel coil is continuously rolled for hot rolled pickling coil at room temperature. The inner diameter is 610mm. Product features: Because it has not been annealed, its hardness is very high (HRB greater than 90), the machining performance is very poor, and only a simple directional bending process of less than 90 degrees (perpendicular to the direction of winding) can be carried out.
Cold rolling is one of the important processes of rolling mill equipment, and it is the machine needed for most metal processing. Our factory has been exporting cold rolling mill equipment to help customers in production.
