4 High Two Heads Reversing Cold Mill Tandem Reversible Cold Rolling Mill Machine

4 High Two Heads Tandem Reversible Cold Rolling Mill Machine

• Reversible cold rolling mill has advantages of lower investment, less space, variable thicknesses, and disadvantages of less thickness reducing degree, less scale production, lower percentage of productivity, compared with tandem cold rolling mill. 
• Tandem cold rolling mill has the character of continuous rolling,one way from uncoiling to coiling and working without stop, customer can get big scale production and higher productivity.
• When steel strips are long and a lot, thickness reduction is 2 to 4 passes, reversible cold mill needs the steel strip to and fro for 2 or 3 times, while 2 heads tandem mill is not capable but 4 heads cold mill is not taken fully used, a two heads tandem reversible cold rolling mill is a better solution.
• The investment is one head of cold mill additional only, the performance will be two heads tandem rolling, 3 or 4 passes one reverse rolling, flexible options, higher production, less power consumption, less land occupation.
• The electric control system is high tech high precision, not only include traditional tandem cold rolling system, but also incorporate the reverse cold rolling technology. 
• The two heads reversing mill line require high precision mechanic design and production, represent the manufacturing precision level of cold mill plant.

Configuration

1. Hydraulic AGC system is controlled by two-stage computer. It not only has the functions of constant roll gap, constant rolling force, thickness pre-control/monitoring, but also has tension AGC.
2. The main rolling mill and the left and right coiler are driven by a complete set of Siemens electronically controlled direct current motor. (Mixed-mounted structure), SCR power supply
3. The rolling mill has hydraulic pressure system, hydraulic pumping regulation system, side push regulation system, positive and negative bending roll of intermediate roll, process lubrication system and equipment lubrication system
4. Left and right coilers adopt large tension solid drum, tension digital control
5. The production process interlocking and fault alarm of the unit are controlled by programmable logic controller (PLC) to realize the automation of the production process.
6. The rolling mill has full hydraulic pressure. It has the control functions of full stroke second flow control, deviation adjustment control, automatic preloading control, thickness pre-control AGC, thickness monitoring AGC, tension/speed AGC, acceleration and deceleration AGC compensation control, roll eccentricity compensation, and rolling process database, data display and operation control, product quality tracking function, high-speed rolling data automatic recording, automatic report generation, fault alarm and recording. Recording and other process management functions.
7. Detection, display and fault alarm system of process parameters and key equipment parameters
8. Emulsion cooling system and precision filtration system are used for process lubrication.
9. Safety protection systems such as overload protection, strip breakage protection and emergency parking are installed in rolling mills.
10. Hard tooth face herringbone gears (grade 5 accuracy) are used for left and right coilers and main machines. SKF, FAG, TIMKEN are used for high-speed shaft bearings and Harbin/Wafangdian/Luoyang Bearing Factory is used for low-speed shaft bearings.
11. The unit adopts two-stage computer control to realize the production process control of the unit. The unit has rolling schedule calculation, pass distribution, regulation and parameter optimization. Real-time process parameters and key detection, display and alarm
12. Quick Adjustment of Rolling Line Elevation by Inclined Wedge and Step
13. Quick roll change of work roll intermediate roll (about 8 minutes)
14. The unit adopts imported laser velocimeter to realize second flow control and improve the rate of finished product, while retaining encoder to measure speed
15. The unit tension is measured directly by imported tensiometer, closed-loop control and digital display
16. The main components of high-pressure AGC system, bending roll system and side roll system adopt imported products; the components of low-pressure hydraulic system adopt well-known products produced by domestic imported technology.
17. The unit thickness is measured by X-ray thickness gauge made in China, the encoder is P+F from Germany, and the proximity switch is made by SICK from Germany.
18. The work roll is positioned radially by the side roll support, which enhances rigidity and prevents side bending. Axis is positioned by end support door and controlled by cylinder, which is convenient for on-line roll change of finished product pass and meets the requirements of stainless steel rolling.
19. Oil-air lubrication for backing bearing of roller bearing

550 Two Heads AGC Reversing Cold rolling Mill.