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China Suppliers Factory for 6 Hi Reversing Cold Rolling Mill - High Precision Steel Rolling Equipment

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MAIN FUNCTION OF THE EQUIPMENT
This advanced equipment is designed for the precise reverse rolling of high-quality normal carbon steel, stainless steel strips, and low alloy steel, ensuring optimal performance for various industrial applications.

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COMPONENTS AND FEATURES OF THE EQUIPMENT
Our rolling mill features a robust Uncoiler, a Hydraulic Coil Car, and an unloading car for enhanced efficiency. It includes a 5 Roll Pinch Flattener, entrance and exit platforms, and both left and right recoilers. A reliable joint gear box, Hydraulic AGC, and bending roll system are integrated for superior operation. Powered by a strong driving motor and controlled by an advanced electric control system, this equipment also features a comprehensive lubrication system for both equipment and process lubrication, making it an ideal choice for manufacturers in China looking for high-quality solutions. Connect with our suppliers and factory to learn more about this state-of-the-art rolling technology.

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    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

    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.

    The six-high reversible cold rolling mill is characterized by high precision, strong adaptability and high efficiency. It is suitable for various materials such as stainless steel, common steel, aluminum and copper, and can roll raw materials with thicknesses ranging from 1.5 to 4.5 mm into thin-gauge finished products with thicknesses ranging from 0.15 to 2.0 mm. The rolling accuracy can reach ±0.02 mm, and the rolling speed is usually 360 to 1000 m/min. The equipment is often integrated with hydraulic systems, automatic control systems and auxiliary devices (such as uncoilers and thickness gauges) to achieve automated operation.

    Typical application scenarios include cold rolling lines for strip steel and deep processing of metal materials. For example, a 1400 mm specification equipment has a maximum rolling force of 12000 kN, suitable for wide strip rolling, and is widely used in the automotive, home appliance, energy and other industries for the demand of high-precision metal strips.

    • ⚙️ Six-High Structure
      Work rolls, intermediate rolls & backup rolls for optimal pressure distribution
    • 🎯 ±0.02 mm Precision
      Industry-leading rolling accuracy for high-quality finished products
    • Up to 1000 m/min
      High-speed reversible rolling for maximum productivity
    • 🏭 Multi-Material Support
      Stainless steel, carbon steel, aluminum, copper & more

    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 parameter shown in this table are for reference only. The design and production can be tailor-made according to user's requirements.

    Frequently Asked Questions (FAQ)

    Q What is a six-high reversing cold rolling mill and how does it differ from a four-high mill?
    A six-high reversing cold rolling mill uses six rolls — work rolls, intermediate rolls, and backup rolls — compared to the four rolls in a conventional four-high mill. The addition of axially movable intermediate rolls allows for superior plate shape control, reduced roll deflection, and more precise thickness uniformity, making it ideal for high-precision applications.
    Q What materials can be processed by a six-high reversing cold rolling mill?
    The six-high reversing cold rolling mill is compatible with a wide range of metallic materials, including carbon steel, low alloy steel, stainless steel, aluminum, and copper. Its flexible roll configuration allows it to handle materials with varying hardness and thickness requirements.
    Q What rolling accuracy and speed can this equipment achieve?
    The six-high reversing cold rolling mill can achieve a rolling accuracy of ±0.02 mm, which meets the strictest demands for precision metal strips. Rolling speeds typically range from 360 to 1000 m/min (up to 900 m/min for models 1150 and 1380), ensuring both quality and production efficiency.
    Q How does the Hydraulic AGC system improve rolling performance?
    The Hydraulic Automatic Gauge Control (AGC) system continuously monitors and adjusts the roll gap during the rolling process. This real-time control compensates for variations in material thickness, roll wear, and thermal expansion, ensuring consistent finished product dimensions and significantly reducing scrap rates.
    Q What industries typically use six-high reversing cold rolling mills?
    These mills are widely used across industries that require high-precision thin-gauge metal strips, including the automotive industry (body panels, structural components), home appliances (casings, frames), energy sector (transformer laminations), and electronics manufacturing. The versatility of the equipment makes it a core asset in modern cold rolling production lines.
    Q Can the six-high reversing cold rolling mill be customized to meet specific production requirements?
    Yes. The technical parameters — including mill model, roll specifications, rolling force, motor configuration, and strip width capacity — can all be tailor-made according to the customer's specific production requirements. The design and manufacturing process is fully customizable to suit various application scenarios and material specifications.