Production method with low energy consumption, 24 passes and high efficiency for hot rolling of phi-8 coiled reinforced bar

Abstract

The invention discloses a production method with low energy consumption, 24 passes and high efficiency for hot rolling of a phi-8 coiled reinforced bar. The production method comprises four rolling mills for rough milling, six rolling mills for intermediate rolling, four rolling mills for finish rolling of bars and ten rolling mills for finish rolling of wires, wherein 1H to 3H racks roll by adopting a slotless form; 4V to 14V racks and No.15 to No. 24 racks roll by adopting a round/elliptical pass form; the 14V rack produces rolled pieces which are round bars of 24+/-0.5mm; the pass width of the No.15 rack is 32.1-32.3mm, and the pass height is 16.15-16.30mm. According to the production method disclosed by the invention, by meticulously designing pass parameters of all the passes prior to the wire finish rolling mills for the hot rolling of the phi-8 coiled reinforced bar, and controlling the size and the precision of incoming bars for wire finish rolling, the safety of a motor of the wire finish rolling mill is guaranteed; the elongation percentage is reasonably distributed by the wire finish rolling racks, so that the phi-8 hot-rolled coiled reinforced bars are rolled on the 24 racks. Compared with a mode of rolling by 26 racks in the prior art, the mode disclosed by the invention has the advantages that the consumption of spare parts and the production energy consumption can be greatly reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a production method for 24-pass high-efficiency hot-rolled Φ8 coils with low energy consumption and capable of greatly reducing spare parts consumption and production energy consumption and improving production efficiency. Background technique [0002] Hot-rolled steel bars are finished steel bars that have been hot-rolled and naturally cooled. They are made of low-carbon steel and ordinary alloy steel at high temperatures. They are mainly used for reinforcement of reinforced concrete and prestressed concrete structures. They are used in civil engineering One of the most widely used steel varieties. Usually Φ6-10mm steel bars are mostly rolled into wire rods, among which Φ6-12mm plain round bars (plain round bars), commonly known as smooth steel bars, are the most common; while threaded steel bars usually have two longitudinal ribs and uniform length along t...

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Problems solved by technology

[0006] In the present invention, the average elongation coefficient is obtained from the elongation calculation formula for the cross-sectional area of ​​the hot-rolled Φ8mm coil screw and the blank area, and the pass parameters of each pass before the wire finishing mill are carefully designed, especially the 1H-3H rack adopts no groove Rolling not only overcomes the surface defects of the pass rolling method, frequent roll change and pass change, excessive roll consumption, low mill output and yield, but also the 1H ~ 3H stands do not need to be adjusted due to steel types and The change of production specifications reduces the number of roll changes, and the rolls and guides are highly shared, which improves the utilization rate of the rolling mill

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