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    4 HI REVERSING COLD ROLLING MILL

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    High Precision Reversing Cold Rolling Mill for Carbon & Stainless Steel - China Suppliers & Factory

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    MAIN FUNCTION OF THE EQUIPMENT
    This high-quality product is designed for reverse rolling of precision carbon steel, stainless steel strips, and low alloy steel. As a leading China supplier, we provide efficient solutions tailored to meet diverse manufacturing needs in steel processing.

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    COMPONENTS AND FEATURES OF THE EQUIPMENT
    The equipment includes an uncoiler, hydraulic coil car and unloading car, a 5-roll pinch flattener, entrance and exit platforms, a rolling mill, left and right recoilers, a joint gearbox, hydraulic AGC and bending roll systems, a driving motor, an electric control system, and both equipment and process lubrication systems. Our factory focuses on delivering robust machinery that enhances productivity and precision for our clients.

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      Product Details

      The Theory of Six Roll Rolling Mill

      Six roll rolling mill adds a pair of middle roller that can move symmetrically and axially, eliminating the harmful contact between working roll and support roll. During milling, for different width of steel strips will use different movement amount of middle roll, change the contact pressure distribution (flattening value distribution) between rollers and bending force, so to control the plate shape and convexity.

      The Theory of Six Roll Rolling Mill

      Product Introduction

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      The six-high reversing cold rolling mill is a high-precision metal rolling equipment, mainly used for multi-pass rolling of strip materials at room temperature to achieve thickness reduction, plate shape control and surface quality improvement.

      The core feature of this equipment lies in its six-high structure design and reversible rolling function. It consists of six rolls including work rolls, intermediate rolls and backup rolls, among which the intermediate rolls can move axially (oscillate), and the work rolls are equipped with hydraulic bending roll devices. This design can effectively adjust the pressure distribution between the rolls and improve the accuracy of plate shape control; the reversible rolling function allows the strip to be rolled back and forth in the mill, ensuring thickness uniformity.

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      High Precision & Adaptability Suitable for stainless steel, common steel, aluminum and copper. Rolling accuracy reaches ±0.02 mm, speed 360–1000 m/min.
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      Wide Thickness Range Rolls raw materials 1.5–4.5 mm thick into thin-gauge finished products 0.15–2.0 mm thick.
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      Automated Integration Integrated with hydraulic systems, automatic control systems and auxiliary devices (uncoilers, thickness gauges) for automated operation.
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      Industry Applications Widely used in automotive, home appliance and energy industries. 1400 mm model supports up to 12,000 kN rolling force.

      Technical Parameter Table

      Mill Model / Technical Parameter 950 1150 1380
      Material Carbon steel and low alloy steel Carbon steel and low alloy steel Carbon steel and low alloy steel
      Material thickness (mm) 2.0~3.5 2.0~4.0 2.0~4.0
      Material width (mm) 600~850 900~1050 1000~1250
      Finish thickness (mm) 0.5~0.15 0.5~0.16 0.5~0.18
      Pressing force (KN) 9000 13000 15000
      Support roll specification (mm) Φ800×920 Φ1050×1120 Φ1100×1350
      Middle roll specification (mm) Φ350/Φ320×900 Φ380/Φ350×1150 Φ380/Φ350×1350
      Working roll specification (mm) Φ260/Φ235×950 Φ310/Φ280×1150 Φ280/Φ255×1380
      Driving method Working roll driving Working roll driving Working roll driving
      Main motor DC 1250KW×2 DC 1000KW×4 DC 1250KW×4
      Speed reducer Joint gear box Joint gear box Joint gear box
      Uncoiler (specifications) Φ610×950 Φ610×1150 Φ610×1380
      Recoiler (specifications) Φ508×950 Φ508×1150 Φ508×1380
      Rolling speed (m/min) 800 900 900
      Uncoiler tension (KN) 45 70 70
      Recoiler tension (KN) 9~90 14~140 17~170
      Pressing method Hydraulic AGC Hydraulic AGC Hydraulic AGC
      DC speed regulator Siemens 6RA70 Siemens 6RA70 Siemens 6RA70
      Electric control Siemens PLC Siemens PLC Siemens PLC
      📌 Remark: The model and parameters shown in this table are for reference only. The design and production can be tailor-made according to user's requirements.

      Frequently Asked Questions

      QWhat is the main advantage of a six-high rolling mill over a four-high rolling mill?
      The six-high rolling mill introduces a pair of intermediate rolls that can move axially, eliminating harmful contact between the working roll and the backup roll. This allows for more precise control of contact pressure distribution and roll bending force, resulting in superior plate shape control, convexity management, and the ability to roll thinner gauges with higher accuracy compared to a conventional four-high mill.
      QWhat materials can be processed by the six-high reversing cold rolling mill?
      The six-high reversing cold rolling mill is highly adaptable and can process a wide range of materials, including carbon steel, low alloy steel, stainless steel, aluminum, and copper. This versatility makes it suitable for various industrial sectors such as automotive, home appliances, and energy manufacturing.
      QWhat thickness range can the six-high reversing cold rolling mill achieve?
      The mill can process raw material with an incoming thickness ranging from 1.5 to 4.5 mm and reduce it to a finished thin-gauge product with a thickness of 0.15 to 2.0 mm. The rolling accuracy achieved is ±0.02 mm, making it suitable for high-precision strip applications.
      QHow does the reversible rolling function work and what benefit does it provide?
      The reversible rolling function allows the strip to pass back and forth through the mill in multiple rolling passes without needing to be re-threaded. Each pass progressively reduces the strip thickness. This multi-pass capability ensures excellent thickness uniformity across the length of the coil and allows the mill to achieve very thin final gauges efficiently within a compact footprint.
      QWhat control system is used in the six-high reversing cold rolling mill?
      The mill uses a Siemens PLC for overall electric control and a Siemens 6RA70 DC speed regulator for precise speed management. The pressing method utilizes Hydraulic AGC (Automatic Gauge Control), which automatically adjusts the roll gap in real time to maintain consistent strip thickness throughout the rolling process.
      QCan the equipment specifications be customized according to specific production requirements?
      Yes. While standard models such as the 950, 1150, and 1380 specifications are offered as reference configurations, the design and production of the six-high reversing cold rolling mill can be fully tailor-made to meet specific user requirements, including custom roll dimensions, rolling force, motor power, strip width capacity, and automation level.