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Hi Reversing Cold Rolling Mill - High Precision Steel Strips from China Suppliers and Factory

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MAIN FUNCTION OF THE EQUIPMENT
This advanced manufacturing solution is designed for efficiently reversing the rolling process of high precision strips made from normal carbon steel, stainless steel, and low alloy steel. Our equipment ensures superior quality and precision, making it ideal for various industrial applications.

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FEATURES AND COMPONENTS OF THE EQUIPMENT
Our system comprises essential components including an uncoiler, hydraulic coil car and unloading car, a 5 roll pinch flattener, entrance and exit platforms, a robust rolling mill, left and right recoilers, a joint gear box, along with a hydraulic AGC and bending roll system. It also features a reliable driving motor, an advanced electric control system, and an effective lubrication system for both equipment and process. As a trusted China supplier and factory, we prioritize quality and efficiency in our manufacturing processes, delivering top-tier solutions to our clients.

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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

    • ⚙️ Six-High Structure — Work rolls, intermediate rolls & backup rolls for optimal pressure distribution
    • 🔄 Reversible Rolling — Multi-pass back-and-forth rolling for superior thickness uniformity
    • 📏 High Precision — Rolling accuracy up to ±0.02 mm
    • 🚀 High Speed — Rolling speed from 360 to 1000 m/min

    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.

    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 conventional rolling mill?
    A six-high reversing cold rolling mill uses six rolls — work rolls, intermediate rolls, and backup rolls — instead of the standard four. The intermediate rolls can move axially, which eliminates harmful contact between work rolls and backup rolls. This design provides significantly better plate shape control, reduced edge drop, and improved strip flatness compared to a conventional four-high mill.
    Q What materials can be processed by the six-high reversing cold rolling mill?
    The equipment is suitable for a wide range of metal materials, including stainless steel, common carbon steel, low alloy steel, aluminum, and copper. It handles raw material thicknesses from 1.5 to 4.5 mm and produces finished products with thicknesses as low as 0.15 mm.
    Q What rolling accuracy and speed can this equipment achieve?
    The six-high reversing cold rolling mill achieves a rolling thickness accuracy of ±0.02 mm. Rolling speeds typically range from 360 to 1000 m/min depending on the model and material specification, with the 950 model achieving up to 800 m/min and the 1150 and 1380 models achieving up to 900 m/min.
    Q Which industries commonly use six-high cold rolling mills?
    Six-high cold rolling mills are widely used in the automotive industry (body panels, structural parts), home appliance manufacturing (washing machine drums, refrigerator shells), the energy sector (transformer steel, battery materials), and general metal processing industries that require high-precision thin-gauge metal strips.
    Q Can the technical parameters be customized according to specific production requirements?
    Yes. The models and parameters listed in the technical table are standard reference specifications. The design and manufacture of each machine can be fully tailor-made to suit the customer's specific production requirements, including material type, strip width, thickness range, rolling force, and automation level.
    Q What control system does the six-high reversing cold rolling mill use?
    The equipment adopts Siemens PLC for electric control and Siemens 6RA70 for DC speed regulation, ensuring reliable and precise automation. The pressing method uses Hydraulic AGC (Automatic Gauge Control) to maintain consistent thickness throughout the rolling process. The system integrates seamlessly with auxiliary equipment such as uncoilers, recoilers, and thickness gauges.