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High Precision Reversing Cold Rolling Mill for Steel Strips - China Suppliers & Factory Equipment

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MAIN FUNCTION OF THE EQUIPMENT
This high-precision equipment is designed for reverse rolling of high-quality normal carbon steel, stainless steel strips, and low alloy steel. It is an essential solution for suppliers and factories looking to enhance their metal processing capabilities in China.

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FEATURES AND COMPONENTS OF THE EQUIPMENT
The system includes an uncoiler, hydraulic coil car, unloading car, a 5-roll pinch flattener, entrance and exit platforms, rolling mill, left and right recoilers, joint gear box, hydraulic AGC, and bending roll system. The driving motor, electric control system, as well as lubrication systems for both equipment and process, ensure optimal performance and reliability for steel manufacturers in China.

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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.

    🎯 High Precision Rolling accuracy up to ±0.02 mm
    High Speed 360 – 1000 m/min rolling speed
    🔧 Multi-Material Stainless steel, carbon steel, aluminum & copper
    📐 Wide Thickness Range 1.5–4.5 mm input → 0.15–2.0 mm finished

    📊 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

    Q What is the main advantage of a six-high rolling mill over a four-high rolling mill?
    The six-high rolling mill adds an intermediate roll pair that can move axially, eliminating harmful contact between the working rolls and backup rolls. This enables precise control of pressure distribution across the strip width, achieving superior plate shape control and convexity management that a four-high mill cannot provide.
    Q What materials can the six-high reversing cold rolling mill process?
    The equipment supports a wide range of 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 can reduce them to finished thicknesses between 0.15 and 2.0 mm.
    Q What rolling accuracy does this equipment achieve?
    The six-high reversing cold rolling mill achieves a rolling accuracy of ±0.02 mm. This is made possible by the Hydraulic AGC pressing system, Siemens PLC electric control, and Siemens 6RA70 DC speed regulators working together in a closed-loop automation system.
    Q Which industries commonly use six-high cold rolling mills?
    Six-high cold rolling mills are widely used in the automotive industry (body panels and structural parts), home appliance manufacturing (casing materials), and the energy sector (precision strips for transformers and generators). Any industry requiring high-precision thin-gauge metal strip benefits from this equipment.
    Q Can the mill specifications be customized for specific production needs?
    Yes. The standard models (950, 1150, and 1380) are for reference only. Roll dimensions, pressing force, motor power, rolling speed, and other parameters can all be tailor-made to meet specific user requirements.
    Q How does the reversible rolling function improve production efficiency?
    The reversible rolling function allows the strip to pass back and forth through the mill for multiple reduction passes without physically transferring the coil. This enables multi-pass thickness reduction in a single compact line, reducing floor space and equipment investment while ensuring consistent thickness uniformity across the entire strip length.