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

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MAIN FUNCTION OF THE EQUIPMENT
This advanced rolling mill is designed for the precise processing of high-quality normal carbon steel, stainless steel strips, and low alloy steel. Ideal for manufacturers seeking reliable solutions, this equipment ensures optimal performance for rolling operations, catering to various industrial needs.

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COMPONENTS AND FEATURES OF THE EQUIPMENT
Our rolling mill includes a range of essential components: an uncoiler, hydraulic coil car and unloading car, a 5-roll pinch flattener, entrance and exit platforms, rolling mill, left and right recoilers, a joint gear box, hydraulic AGC and bending roll systems, a powerful driving motor, an advanced electric control system, and a comprehensive lubrication system for both equipment and process maintenance. As a trusted China supplier and factory, we ensure excellence and durability in our manufacturing processes, making this rolling mill an essential addition for any steel processing operation.

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    The Theory of Four Roll Rolling Mill

    ⚙️ Four roll rolling mill system is composed of two support rolls and two working rolls. Pressing force transmits through the support roll bearing stand, support roll, working roll, and finally acts on the rolled piece — reducing height (thickness), extending length to meet target specifications.

    Due to the impact of pressing force, rollers will become bending, the workpiece edges will become thinner. Rollers need grinding their convexity according to practical situation to maintain rolling accuracy and product consistency.

    The Theory of Four Roll Rolling Mill

    Product Introduction

    🏭 The four-high reversing cold rolling mill is widely used in metallurgy, mechanical manufacturing, and non-ferrous metal processing. It achieves material thinning, surface quality improvement, and mechanical property enhancement through four-roll coordinated action.

    From a technical perspective, the four-high reversing cold rolling mill consists of work rolls and backup rolls. The work rolls directly contact the rolled piece to perform rolling deformation, while the backup rolls support the work rolls to reduce their deflection and ensure stability and accuracy. The reversible design enables the rolling mill to roll in both forward and reverse directions without frequent adjustments, significantly improving production efficiency.

    🔩 Application Materials: Stainless steel, carbon steel, alloy steel, copper, and aluminum — serving automotive, electronics, electrical, and other precision industries.

    In the automotive manufacturing industry, rolled plates are used for body panels requiring high strength, good formability, and corrosion resistance. In the electronic and electrical industry, rolled strips are used to manufacture precision components requiring high surface finish and dimensional accuracy.

    The design, manufacture, and acceptance of four-high reversing cold rolling mills follow strict industry standards covering structure, performance, safety, and environmental protection — ensuring stable operation and operator safety. Parameters such as rolling force, rolling speed, and roll diameter are clearly specified to ensure process stability and consistent rolling quality.

    Operation and maintenance are equally critical. Operators require professional training in the mill's structure, performance, and procedures. Regular maintenance — including roll replacement, lubrication system inspection, and electrical system servicing — is key to ensuring long-term reliable operation.

    Technical Parameter Table

    Technical Parameter / Mill Model 650 750 850
    Material Carbon steel and low alloy steel Carbon steel and low alloy steel Carbon steel and low alloy steel
    Material Thickness (mm) 2.0 ~ 3.0 2.0 ~ 3.0 2.0 ~ 3.5
    Material Width (mm) 400 ~ 550 500 ~ 650 600 ~ 750
    Finish Thickness (mm) 0.5 ~ 0.15 0.5 ~ 0.16 0.5 ~ 0.18
    Pressing Force (KN) 5,000 6,000 7,500
    Support Roll Specification (mm) Φ550×600 Φ650×700 Φ700×820
    Middle Roll Specification (mm) ———— ———— Φ300/Φ280×820
    Working Roll Specification (mm) Φ185/Φ165×650 Φ205/Φ190×750 Φ225/Φ205×850
    Driving Method Working roll driving Working roll driving Working roll driving
    Main Motor DC Motor DC Motor DC Motor
    Speed Reducer Joint gear box Joint gear box Joint gear box
    Uncoiler Specifications (mm) Φ610×650 Φ610×750 Φ610×850
    Recoiler Specifications (mm) Φ508×650 Φ508×750 Φ508×850
    Rolling Speed (m/min) 360 450 540
    Uncoiler Tension (KN) 30 35 45
    Recoiler Tension (KN) 10 ~ 70 10 ~ 80 10 ~ 90
    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. Design and production can be tailor-made according to user's requirements.

    Frequently Asked Questions (FAQ)

    Q What is the difference between a four-high reversing cold rolling mill and a conventional rolling mill?
    A four-high reversing cold rolling mill uses four rolls — two work rolls and two backup rolls — unlike conventional two-roll mills. The backup rolls support the work rolls to minimize deflection, enabling higher rolling force and greater dimensional accuracy. The reversing capability allows rolling in both forward and reverse directions, eliminating the need to reposition the material between passes and significantly increasing production efficiency.
    Q What materials can be processed by the four-high reversing cold rolling mill?
    The mill is designed to process a wide range of metal materials, including carbon steel, low alloy steel, stainless steel, alloy steel, copper, and aluminum. It is suitable for producing strips and plates used across automotive, electronics, electrical, and general metal manufacturing industries.
    Q What pressing method is used, and why is Hydraulic AGC preferred?
    All three models (650, 750, 850) use Hydraulic AGC (Automatic Gauge Control) as the pressing method. Hydraulic AGC enables precise, real-time adjustment of the roll gap during rolling, ensuring consistent strip thickness across the full length of the coil. This method offers higher accuracy, faster response, and better repeatability compared to mechanical pressing systems.
    Q Can the rolling mill parameters be customized according to specific requirements?
    Yes. The technical parameters listed in the specification table are for reference only. The rolling mill can be fully customized — including roll dimensions, rolling speed, pressing force, motor specifications, and control systems — to meet the specific production requirements of each customer. Please contact our engineering team to discuss your project needs.
    Q Why do rollers require convexity grinding, and how often should it be done?
    Under high rolling pressure, rollers naturally deflect and bend, causing the edges of the workpiece to become thinner than the center. Convexity grinding compensates for this deflection by giving the roll a slight crown profile, ensuring uniform thickness across the full width of the rolled strip. The frequency of grinding depends on production volume, material type, and rolling conditions, and should be determined through regular roll inspection and quality checks.
    Q What are the key maintenance requirements for the four-high reversing cold rolling mill?
    Regular maintenance is essential for long-term reliable operation. Key maintenance tasks include: periodic roll inspection and replacement when wear limits are reached; regular checks and oil replenishment of the lubrication system; inspection and servicing of the hydraulic AGC system for pressure integrity; routine inspection of the electrical control system including Siemens PLC and DC speed regulators; and monitoring of the uncoiler and recoiler tension systems. Operators should be professionally trained and follow scheduled maintenance protocols.