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1450mm Finishing System

1. Model and application:

1.1 Model: 1450mm finishing system

1.2 Application: material width up to 1250mm, material thickness between 0.2mm and 1.5mm

It is used to finish, stretch and straighten steel strips in order to improve the shape, mechanical properties and flatness of steel plates. Stretch steel strips to remove defects such as edge wave, central wave and warp, change the mechanical properties of material, increase the surface finish and obtain the desired shape of steel plate.

2. Process flow:

Feeder- unwinder- hydraulic shearer- seam welder- carrier roll- S-type feeding tension roll- 4-roll finishing system- Rolling surface cleaning device-bending machine- S-type discharge tension roll- carrier roll- hydraulic shearer- winder- unloading device- hydraulic system- electrical system

3. Technical parameters:

Material: SS201, SS 304; σS≤450 MPa (stainless steel)

Material specifications: 0.2-1.5mm×1250mm

Blank tolerance: according to applicable national standards

Coil specifications: max. OD: φ1800mm

Max. tension: 18t

Unwinding and winding tension: ≤8t

Straightening speed: ≤180m/min

Elongation: 0.3-3%

Winding speed: ≤180m/min

Product flatness: ≤8I

Diameter range of winding drum: max. φ508mm, min. φ480mm

Line height: 1200mm

Line direction: rightward

4. Configuration:

Stretch-straightening coiling unit. Stretch-straightening unwinder and winder are positioned at both sides of finishing system and used to bend and straighten strips with stretch-straightening unit and generate the front and the rear tension. It is able to stretch and straighten steel strips at a constant tension and track and display the working speed. Wind steel strips in the centering mode. The winder mainly consists of hydraulic expansion drum, speed reducer, DC motor, movable bearing, cantilever support, EPC aligning system and other components.

Winder: hydraulically-operated

Motor: Z4-315-32  
N=252KW  
n=680/1600r/min  

Voltage/current=440 V/401 A

Speed reducer: center distance at 1000mm, speed ratio: 23.34

Drum specifications: φ508×1450mm

Both loading and unloading carts are raised hydraulically and driven to move horizontally with motor. 

Straightening unit. Straightening unit is a core of finishing system. It works with unwinder, winder and front and rear S-type tension rolls to straighten bent strips under the action of tension. It mainly consists of rolls, frame, raising unit, pressure unit and other components.

Bending roll: 30mm-diameter
Length: 1450mm
Material: 9Cr2Mo
Hardness: HRC61-63
Straightening roll: 180mm-diameter
Length: 1450mm
Material: 9Cr2Mo
Hardness: HRC61-63
Intermediate bending roll: 40mm-diameter
Length: 1450mm
Material: 9Cr2Mo
Hardness: HRC61-63
Backup roll: backup bearing roll: 60mm-diameter
Length: 192mm
Precision: P5
Upper rolls: worm and gear, driven by cycloidal pinwheel gear reducer
Lower rolls: worm and gear, driven by cycloidal pinwheel gear reducer 

Skin pass mill. 4-roll skin pass mill is another core unit of finishing system. It works with unwinder, winder and front and rear S-type tension rolls to flatten strips under the action of tension. It mainly consists of rolls, frame, raising unit (hydraulic AGC), main drive, hydraulic roll changing device and other components.

Main drive: Z4-355-32  
N=355KW  
n=600/1600r/min  
Voltage/ current: 440 V/877 A              
Speed reducer: model ZLY500, speed ratio: 12.5
Backup roll: 1000mm-diameter
Grinding tolerance of roll diameter: 20mm
Length: 1400mm
Material: 9Cr2Mo
Working roll: 500mm-diameter
Grinding tolerance of roll diameter: 20mm
Length: 1450mm
Material: 9Cr2Mo
Hardness: HS90-92
Hydraulic pressure unit
Working pressure: 25MPa
Frame: section area of upright: 420× 500 mm2
Upper balancing cylinder: bore: Φ125mm; pressure: 6MPa

Hydraulic shearer   two

Hydraulic shearers are of downward type. They are mainly used to cut ends of steel strips and separate coils.

Shearing thickness: 0.25-1.2mm

Shearing width: 1350mm

Left and right S-type tension rolls. They are positioned at both sides of stretch-straightening unit. It is used to increase the tension between the stretch-straightening unit and the winder in order to optimize the straightening performance. It mainly consists of S-type rolls, speed reducer, DC motor, seat and other components.

Specifications of S-type roll: 900×1450 mm
Surface hardness of S-type roll: HS85-90
Model of motor I: Z4-250-31
Power: 132KW
Speed: 1000/2000rpm
Voltage/ current: 440V/227A
Speed reducer I: model NGW 102, speed ratio: 18
Model of motor II: Z4-280-21
Power: 200KW
Speed: 1000/2000 rpm
Voltage/ current: 440V/401A
Speed reducer II: model NWG112, speed ratio: 18

Hydraulic shearer. It is an upstroke hydraulic shearer and mainly used to cut ends of steel strips and separate coils.

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