High Speed Reducing and Sizing Rolling Mill Wire Rod Making Machine
Reducing and sizing mill designing concept
The whole machine has fast speed, good control, high rolling precision and good interchangeability of the whole machine. Two reducers and two slurry machines are installed behind the finishing rolling mill. Through the expansion of RSM, 8 finishing rolling mill stands can be installed. The speed is greatly reduced, and the temperature increase in the high-speed wire rod area is also reduced, thereby achieving high-speed and low-temperature rolling. Ensure the mechanical properties of the final product. The RSM is located between the finishing mill and the laying head. The material is rapidly cooled in a large water tank to control the temperature of the material entering the RSM. Hot rolling technology is used to improve the internal structure of the wire rod and improve the mechanical performance and surface quality. We use the traditional oval-circular system to design the groove of the entire production line. The material surface can be flexibly adjusted, which allows a significant reduction rate in RSM, thereby significantly reducing rolls and roll storage, simplifying roll management, and reducing The number of exchanges is reduced and rolling efficiency is improved. The final product is processed by RSM with high precision, the dimensional tolerance is guaranteed to be around ±0.1 mm, and the ovality is around 60% of the overall deflection angle.
Main features of the diameter reducing sizing machine
RSM consists of 4 cantilever rolling mills, distributed in a V shape. The first 2 are reducing mills and the last 2 are sizing mills. They adopt an elliptical-round-round groove system to achieve high product accuracy. RSM is driven by an AC motor. It is driven by a gear box and has 9 clutches. When rolling different products, the clutch position can be switched to meet different process requirements. The reasonably designed roll gap can ensure the micro-tension rolling of RSM. This ensures high accuracy of the final product.
Advantage of reducing and sizing machine technique
1. Increase the machine production
The design speed of RSM is 140m/s, and the guaranteed speed can reach more than 110m/s. The exit speed of RSM is basically stable at more than 100m/s. Therefore, using RSM technology can significantly increase the processing speed of small-sized finished products, thereby improving the processing speed of small-sized products. The total machine output of the product. For example, the finishing speed of Φ5.5mm wire rod is increased from 85 m/s to 110 m/s, and the milling output can be increased to 30%. Especially for small-grained products that account for a high proportion of total output, this production line can significantly increase or decrease the annual loading rate of the mill.
2. Low-temperature high speed and Controlled rolling
The average rolling temperature of RSM is 750ºC~800ºC to meet the requirements of controlling the rolling γ + α two-phase region, which can effectively refine the grain size and improve the performance of wire rod products. The corresponding allowable rolling force has been greatly improved compared with the finished frame of the finishing rolling mill designed in the past. The pressure reducer and sizing machine are 330kn and 130kn respectively.
3. Simplifying the pass system
Due to the large reduction ratio of the reducer, the rolling section can be flexibly adjusted appropriately, greatly simplifying the tunnel system of rough rolling, intermediate rolling, pre-finishing mill and finishing mill.
4. Improving product precision
Due to the gluing machine, precision rolling can be achieved, the dimensional tolerance of wire rod products is controlled within ±0.1 mm, and the ovality dimensional deviation is 60% of the total deviation, which is extremely beneficial to downstream metal product deep processing and standard production users.
5. Improve product competitiveness
For ordinary wire rods, cold rolling can be achieved using reducing mill technology, which can achieve the same product performance as microalloying. Therefore, it can replace the microalloying process, thereby saving alloy materials and effectively reducing production costs. For special wire rods, "free sizing" products with precise dimensional tolerances and a fine-grained structure obtained through controlled rolling and cooling processes can reduce pickling when drawing cold heading steel and high-quality bearing steel. , drawing and annealing processes, saving raw materials and reducing costs. In addition, the use of reducing diameter grinding technology can also adapt to small-scale multi-standard rolling plans, ensuring high yields and flexible adaptation to market demands despite frequent specifications changes.
Reducing sizing mill technology parameters
Wire rod rolling specifications:Φ5.5~Φ16mm
Rolling speed:110 m/s
Rolling force allowed:
Reducing force :330KN, Sizing force :130KN
Roller shaft dia:
Reducing shaft dia:Φ 230mm,Sizing shaft dia:Φ150mm
Rolling temperature:≥750ºC
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