The main performance parameters and applications of the twenty-roll rolling mill 

The twenty-roll mill is the most suitable machine for cold rolling of stainless steel, silicon steel, and high-strength metals and alloys in the form of thin strips and ultra-thin strips. It accounts for almost 96% of the stainless steel production worldwide. 

Its main features: 

Rolled raw materials: Stainless steel (300/400 series), silicon steel and high-strength metals 

(Thickness of the rolled raw material: 3 - 5 mm / Thickness of the rolled product: 0.3 - 3 mm) 

Rolled steel strip width: 1020mm (42''), 1270mm (50''), 1350mm (54'') 

Maximum rolling force: 800T 

Rolling maximum speed: max 800 m/min 

Annual production capacity: 100,000 tons per year 

The maximum outer diameter of the steel coil: φ1200mm, φ1600mm, φ2200mm 

Maximum tension of the coiler: 20t, 30t, 40t 

The maximum installed capacity of the unit: ~11000kw 

Pressing speed: 2mm/s, Pressing and opening speed: 20mm/s 

Pressing response time: 35ms 

Pressing accuracy: +/-1 micron 

Profile adjustment amount; 0.44mm 

Profile adjustment accuracy: +/-0.1um 

Rolling method: Push - Pull 

Rolling speed: 20 meters per minute, Rolling stroke: 120 millimeters 

Cooling lubricating oil flow rate: 11000 L/min 

Smoke exhaust capacity: 30,000 cubic meters per hour 

Plate shape control: < ~10I 

The main structural features of the rolling mill 

The tower-shaped roller system of the twenty-roll mill enables the rolling pressure to be distributed in a fan-shaped manner to the outer supporting rollers. The more layers of rollers in the tower structure, the more supporting rollers there will be on the outer side, and the smaller the rolling pressure borne by the supporting rollers will be, and the smaller the deflection deformation of the rollers will be. Moreover, the tower-shaped roller system structure can effectively ensure that the small-diameter working rollers have greater stiffness and stability in the vertical plane and horizontal plane, thereby ensuring the stability of the rolling process and reducing the deflection deformation of the rollers. This feature is particularly important when rolling stainless steel, silicon steel, and high-strength metal and alloy thin strips. 

2. The overall cast steel frame has high rigidity, and the rolling force acts radially on all the sections of the frame. 

3. The diameter of the working rolls is small, and the reduction rate per pass is high. With fewer rolling passes, some materials can be rolled into very thin strips without the need for intermediate annealing. 

4. It features axial and radial roller shape adjustment, roller diameter size compensation, and rolling line adjustment mechanism. Moreover, it adopts hydraulic press-down and hydraulic AGC adjustment mechanisms. As a result, the product has excellent plate shape and high dimensional accuracy. 

5. The equipment is lightweight and the size of the rolling mill is compact. 

Description of the main mechanical properties of the rolling mill 

The rolling mill is equipped with multiple adjustment mechanisms. During the rolling process, through manual and automatic control systems, various necessary adjustments can be carried out flexibly, thereby obtaining high-precision and well-formed finished strip materials. 

1. Hydraulic AGC Press Down Adjustment Mechanism 

The pressing-down mechanism is achieved through hydraulic pressing-down, and the eccentric adjustment mechanism for the upper supporting roller group B/C supporting rollers is utilized. In case the rolling force suddenly increases or decreases, the AGC thickness control system can automatically adjust and correct it. 

2. Press the alignment mechanism of the rolling line 

The pressing and alignment mechanism, also known as the rolling line elevation adjustment mechanism, is realized by a hydraulic pressing mechanism through the eccentric shaft of the lower supporting roller group F/G. As the working rolls, intermediate rolls and supporting rolls wear and are re-ground, the rolling line elevation must be adjusted at any time. 

3. Radial roller profile adjustment mechanism (bulge adjustment) 

The radial roller profile adjustment mechanism is achieved by the hydraulic cylinder driving the outer eccentric ring of the B/C supporting rollers to rotate, causing the supporting rollers to deform at different positions along the length of the roller body, thereby achieving the purpose of adjusting the roller profile. Moreover, the hydraulic system has a fast response speed, short alignment time, and high sensitivity. 

4. Axial roller profile adjustment mechanism (first intermediate roller swivel roller) 

The axial roll shape adjustment is achieved through the axial movement of the first intermediate roll. This mechanism can ensure the uniformity of the strip material in the transverse dimension and can also be used to eliminate the edge waves of the strip material caused by the bending deformation of the working rolls during the rolling process. 

The axial movement of the first intermediate roll can be carried out during the rolling process. 

5. Compensation adjustment mechanism for roller diameter 

When the diameter of the rolling mill rolls becomes smaller due to repeated grinding, and the adjustment of the lowering and raising mechanisms cannot meet the required gap of the rolls, the compensation mechanism for adjusting the roll diameter is used to solve this problem. 

6. Filter cartridge reverse flushing filtration system. 

The process lubrication system is an essential component of the rolling mill. Its performance directly affects the stable operation of the rolling mill and the quality of the product surface. 

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