Main performance parameters and uses of twenty-high rolling mill
The twenty-high rolling mill is the most suitable rolling mill for cold rolling stainless steel, silicon steel and high-strength metal and alloy thin strips and ultra-thin strips. It is responsible for almost 96% of the world's stainless steel production.
Its main performance:
Rolling raw materials: stainless steel (300/400 series), silicon steel and high-strength metals
(Thickness of rolling raw material: 3~5mm/Thickness of rolled product: 0.3~3mm)
Rolled strip width: 1020mm (42’’), 1270mm (50’’), 1350mm (54’’)
Maximum rolling force:800T
Maximum rolling speed: max800m/min
Annual production capacity: 100,000 tonnes/year
Maximum outer diameter of steel coil: φ1200mm, φ1600mm, φ2200mm
Maximum tension of coiler: 20t, 30t, 40t
Maximum installed capacity of the unit: ~11000kw
Pressing speed: 2mm/s, pressing and opening speed: 20mm/s
Press response time: 35ms
Pressing accuracy: +/-1um
Convexity adjustment amount; 0.44mm
Convex adjustment accuracy: +/-0.1um
Roller shifting method: push----pull
Roller shifting speed: 20m/min, roller shifting stroke: 120mm
Cooling lubricating oil flow: 11000L/min,
Smoke exhaust capacity: 30000m3/h
Plate type control:＜~10I
The main structural features of the rolling mill
1, the tower-shaped roller system of the twenty-high rolling mill transmits the rolling pressure to the outer support roller in a fan-shaped manner. The more roller layers in the tower layer and the number of support rollers in the outer layer, the smaller the rolling pressure the support roller will bear, and the smaller the deflection deformation of the roller. Moreover, the tower-shaped roll system structure can well ensure that the small-diameter work roll has greater rigidity and stability in the vertical and horizontal planes, thereby ensuring the stability of rolling and reducing the deflection deformation of the roll.
This feature is especially important when rolling stainless steel, silicon steel and high-strength metal and alloy thin strips.
2, the frame of integral steel casting has high rigidity, and the rolling force acts radially on each section of the frame.
3, the work roll diameter is small, and the pass reduction rate is large. With fewer rolling passes, some materials can be rolled into very thin strips without intermediate annealing.
4 has axial and radial roll shape adjustment, roll diameter size compensation and rolling line adjustment mechanism, and adopts hydraulic pressing and hydraulic AGC adjustment mechanism, so the product has good shape and high dimensional accuracy.
5, the equipment is light in weight and the rolling mill has small dimensions.
Description of main mechanical properties of rolling mill
The rolling mill has a variety of adjustment mechanisms. During the rolling process, various necessary adjustments can be made very flexibly through manual and automatic control systems, thereby obtaining high-precision and excellent finished strips.
1, hydraulic AGC pressure adjustment mechanism
The pressing down adjustment mechanism is realized by hydraulic pressing and the eccentric adjustment mechanism in the B/C support rollers of the upper support roller group. When the rolling force suddenly increases or decreases, it can be automatically adjusted and corrected through the AGC thickness control system.
2, press the rolling line adjustment mechanism
The rolling line adjustment mechanism is also the rolling line elevation adjustment mechanism. It is realized by the hydraulic pressing mechanism through the eccentric shaft of the lower support roller group F/G. As the work rolls, intermediate rolls and backup rolls wear and are reground, the rolling line elevation must be adjusted at any time.
3, radial roller adjustment mechanism (convexity adjustment)
The radial roller shape adjustment mechanism uses a hydraulic cylinder to drive the outer eccentric ring of the B/C support roller to rotate, causing the support roller to deform at different positions along the length of the roller body to achieve the purpose of adjusting the roll shape. Moreover, the hydraulic system has fast response speed, short calibration time and high sensitivity.
4, axial roller shape adjustment mechanism (first intermediate roller shifting roller)
Axial roll shape adjustment is achieved through the axial movement of the first intermediate roll. This mechanism can promote uniform strip size along the transverse direction and can also be used to eliminate strip edge waves caused by bending deformation of the work roll during the rolling process.
The axial movement of the first intermediate roller can be carried out during the rolling process.
5, roller diameter compensation adjustment mechanism
When the roll diameter becomes smaller due to repeated grinding, and the adjustment of the pressing down and pressing up mechanisms cannot meet the required roll gap of the roll, the compensation mechanism of the roll diameter is adjusted to solve this problem.
6, filter element backwash filtration system.
The process lubrication system is the main component of the rolling mill. Its quality directly affects the stable operation of the rolling mill and the surface quality of the product.
(Source: North Axis Technology)