Advanced Technology of Bar Rolling Mill Production Line
1) Adopting the regenerative walking beam heating furnace with side-in and side-out hot charging and cold charging, which improves the waste heat recovery rate of exhaust gas and saves energy consumption; the hot charging process effectively uses the residual heat of billet and reduces Gas consumption. The heating furnace capacity is 160t / h (cold billet), 200t / h (hot billet).
2) The hot billet produced by the steel-making continuous casting machine is sent to the bar production line through the roller table to realize the hot feeding and hot charging of the continuous casting billet. The hot charging temperature ≥650 ℃ up to 900 ℃. The rate of hot delivery and hot charging is over 87%.
3) The equipment in the workshop adopts an elevated layout, and the rolling line equipment is arranged on the + 5.0m concrete platform in the workshop.
4) The main rolling mill of the rolling line adopts the structure of the high rigidity short stress line rolling mill without archway, and the DC motor is separately driven. The full line rolling mill is arranged alternately and vertically, without twisting rolling, and the micro rolling is used for rough rolling and intermediate rolling. The looper tension-free rolling is adopted to ensure the high precision of the product.
5) The rolling mill takes full continuous casting billet (160 * 160 * 12000) as raw material and adopts full continuous rolling. The rolling mill has high strength and large motor power. The motor power of the rough rolling unit is 618KW, the maximum unilateral rolling pressure is 2000KN, the unilateral maximum rolling torque is 120KN • m, and the rolling capacity is one to two times that of the same type of domestic rolling line. It is suitable for high-speed and low-temperature rolling and can meet the control rolling requirements of various steel types.
6) The rolling mill adopts a hydraulic traverse device to quickly change the pass type; the rolling mill adopts an overall frame quick replacement device. The assembly and adjustment of the standby machine are preset in the repair room of the rolling machine, which can greatly shorten the time of changing varieties.
7) Adopt the split rolling production process. φ10-φ16 rebar adopts three-cut production technology. The φ18-φ22 rebar adopts the two-split production process. The φ22 two-split is currently the largest two-split rolling in China.
8) The power of the main motor of the finished frame and the front frame of the finished rolling unit is 1400KW (other frames are 1000KW), which is higher than the motor power of other domestic production lines, which can ensure that the large-size products are cut and rolled.
9) After finishing rolling, a controlled cooling device is built, which can realize the controlled rolling and controlled cooling process and improve the mechanical properties and strength level of the product.
10) The DC motor is powered by a digital thyristor device to realize digital control, which has high control accuracy and good production stability. The rolling line equipment is controlled by an advanced computer system, with complete control functions and reaching the domestic advanced level.
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