Explanation

The processing process of hot-rolled rolled steel product into round or other simple sectional shapes with a minimum diameter of 5mm and non-ferrous metal materials such as copper and aluminum. The section shape of wire rod is mainly circular, and a few are square, hexagonal, etc., with a general diameter of 5.5-13mm. It is characterized by large total elongation, high rolling speed (high-speed wire production can reach 80-160m/s), small section of rolled piece and rapid temperature drop. The billets used for rolling wire rod include rolling billets and continuous casting billets. The section size of billets is generally (80mmX80mm) - (130mmX130mm), and the length is 3-22m. The billet size is mainly determined according to the type of dairy machine, the maximum rolling speed, the total number of stands for each rolling line and the average elongation coefficient adopted. Most of the wire rod rolling mill are two high, and there are many layout forms, mainly including four types: ① horizontal type, the number of stands is generally not more than 15, arranged in two or more rows, and rolling by shuttle and looper; The horizontal type has high labor intensity, large temperature difference between the head and tail of the rolled piece, and low product quality. But with low investment, it is suitable for multi variety and small batch production; ② Double two roll type, rough rolling is horizontal or continuous, while medium rolling and finish rolling are mostly double two roll type, using multi line (2-5 lines) rolling; The production capacity is greater than that of the horizontal type; ③ Continuous, generally in tandem arrangement, rough rolling and intermediate rolling units use flat rolls to roll four steel at the same time, while finishing rolling units use flat vertical roll single line, flat roll multi line or multi row control looper single line rolling; ④ High speed torsion free integral type, Morgan type 45 ° torsion free integral stand high-speed wire rod rolling mill is a two roll type, the roll axis center line forms a 45 ° angle with the horizontal. The adjacent roll axis forms a 90 ° angle alternately, the rolled piece is not twisted in rolling, and the rolling mill is collectively driven: a control cooling line is arranged behind the finish rolling unit; The overall stand is composed of 8-10 roll groups, and cantilever type small diameter carbonization roll is used: due to high-speed deformation, the temperature can be raised instead of being lowered during finish rolling, and the temperature difference between head and tail is small, which can not only increase the sectional size and unit weight of billet, but also improve the dimensional accuracy, surface quality and rolling mill production capacity of wire rod. It is the main way of wire rolling at present.

Classification