I. Operating conditions:
Material: SS201, SS304, SS430
Material thickness: =3.0mm Material width: ≤1250㎜
Product thickness: =0.25mm Product width: ≤1250㎜
Rolling speed: V≤300m/min
Rolling pressure: P≤1500T
Ф160/Ф145/Ф1020/Ф1020×1450 Offset Eight-roll Cold Mill Unit, one set
(1) Screw-down regulator: hydraulic AGC
1) Description of hydraulic automatic gage control system (AGC)
Hydraulic AGC is a necessary device to improve the rolling precision and guarantees manufacturers to gain the advantage in the severe market competition in the future. To maintain the gage control precision and the good pattern of strip steel, it has many functions such as hydraulic roll gap control (AGC), constant rolling pressure control (AFC), thickness gauge pre-control and monitoring.It works reliably and operates conveniently. Furthermore, it is equipped with the complete self-protection functions and the rolling recipe database. To make strip steel of various specifications, access the corresponding setting recipe before each rolling. With it, the thickness control precision of strip steel will become 0.25±0.005mm (vertical thickness deviation)
2) Main components
① Hydraulic pump station
A hydraulic pump station mainly consists of main hydraulic pump, accumulator, oil tank, servo valve bank, pressure reducing/maintaining valve bank, circulating filter and others. For hydraulic pump, the maximum design pressure is 31Mpa and the operating pressure is between 20Mpa and 23Mpa. The hydraulic station provides the flow at the rate of 42L/min and the capacity of 1.0m3 and covers an area about 4 to 6㎡.
② Screw-down oil cylinder
The screw-down oil cylinder is made of high-grade casting alloy steel and passes three NDT cycles to prove the quality of cylinder block. Adopt the unique structure design and the imported oil seal. The use of high-resolution displacement sensor, SONY Magnescale can detect the displacement of oil cylinder and provide the measurement as accurate as 0.001mm. The cylinder block is also equipped with the high-precision pressure sensor to detect the rolling pressure and provide the measurement as accurate as 0.2% to 0.3%. The cylinder block operates 15 to 20 cycles per second.
③ Control System
It is equipped with the high-performance and reliable PLC control that is particularly applicable for severe working conditions.
④ Thickness gauge
Adopt the isotopic ray thickness gauge.
Measurement accuracy: 0.3%; Response time: 30ms
⑤ Servo valve
Adopt the best Chinese servo valves that are made by Nanjing No. 609 Institute. These valves are regularly used in China F-7 and F-8 aircrafts.
3. Technical parameters and requirements
① Hydraulic AGC system
② The designed rolling pressure is 1500t and the output of one cylinder is 750t.
③ Stroke of hydraulic cylinder: 80mm; screw-down speed: 3mm/s
④ Use the screw-down hydraulic cylinder. Its installation is illustrated in the attached figure.
⑤Adopt the medium/high-end configuration for driving system. Otherwise, it may affect the performance of AGC.
⑥ Adopt SONY Magnescale as displacement sensor.
⑦ Use SIEMENS S7-400 to control the AGC and SIMENES S7-200 to control the hydraulic station.
⑧ Rolling speed: 300m/s
4. Main functions of automatic gage control system
① The PLC controls the start, running, stop and other safe operations of hydraulic pump station.
② Functions of hydraulic AGC:
(A) Thickness gage AGC
(B) Monitoring AGC
(C) Pre-control AGC
③ It can realize the quick lifting of roll and automatic calibration of rolling mill.
④ It permits the manual setting of roll gap and displays the rolling pressure, the roll gap and other information.
⑤ It is equipped with various overload protections against over-pressure, over-differential pressure, out-of-tolerance roll gap and other errors and sends alarms.
⑥ It can display rolling parameters.
⑦ It is equipped with rolling recipe database.
⑧Tension AGC and flow AGC are optional upon your request. Nevertheless, you must make sure that the electrical, speed, tension and other systems are accurate and reliable.
(2) Frame assembling:
1. Two closed gantries (sectional dimension of column: 480x580mm)
2. A pair of back-up rolls: hydraulically balanced.
3. A pair of intermediate rolls: positive bending roll
4. Working roll: positive bending roll
5. 4. It is equipped with the front and the rear thickness gauges, the tension testing table and the carrier roll.(thickness gauge provided by user separately)
6. There is a hydraulic tightening device in front of rolling mill.
7. There are hydraulic degreasing units in front and rear of rolling mill.
8. Roller-type aligner
9. Maintenance platform and set of anchor bolts
1. Working roll: diameter x width: Ф160×1435㎜ Material: 9Cr2Mo
2. Back-up roll: diameter x width: Ф1020×1380㎜ Material: 9Cr2Mo
3. Working roll: diameter x width: Ф145×1367㎜ Material: 9Cr2Mo
(asymmetric motion: 0-200mm), dynamic motion
4. Side roll: Ф1020×1380, FC bearing, Material: 9Cr2Mo
5. Two speed detectors
6. Electrically-controlled roll-gap detector
7. Two 600T load cells
8. Two thickness gauges (provided by user separately)
9. Two tension meters
10. Method of lubrication: dry oil lubrication
11. Roll replacement: hydraulic replacement (with rail and bench)
(4) Main drive:
1. Driving method: through intermediate rolls
2. Main motor: Z710-4A N＝1237kW×2 sets n=360/800r/min
3. Main reduction drive: center distance at 1350mm (with lubricant pipe)
4. Herringbone gearbox: A=500mm (hard tooth surface and lubricant pipe)
5. Universal coupling (with bracket)
III. Two sets of solid winder
1. Size of winding drum: Ф550×1450mm
2. Main motor: Z710-4A N＝1237kW n=360/800r/min
3. Reduction drive: ZLY710 (with lubricant pipe)
4. Max. coil weight: 15t; Max. coil diameter: φ1500㎜; Max. tension: 15t
IV. One set of hydraulic pyramid unwinder
1. Size of winding drum: Ф490-Ф510×1450mm
2. Motor: Z4-315-42 N＝315kW n=750/1600r/min
3. Reduction drive: center distance at 850
4. Max. coil weight: 20t; Max. coil diameter: φ1800mm
V. One set of five-roll straightener
Size of roll: Ф150×1450mm
VI. Hydraulic station: 16MPa medium-pressure type, 25MPa
1. Motor: 15KW
2. Condenser, accumulator, pressure gauge, 3-stage filter, unloading device, overflow valve and segment control of system pressure
(for lubricating tooth surfaces in reduction boxes of rolling mill and winder and Herringbone gear box and bearings)
1500T-AGC Hydraulic System Technical Protocol
This hydraulic system is the dedicated device designed by Wuxi Jingcheng Co., Ltd. according to technical requirements. Technical specifications and performance parameters of this equipment are stipulated in this technical protocol.
I Equipment Composition and Technical Parameters
1.Main Engine (AGC) Hydraulic System