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

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Main Function of the Equipment
This advanced machinery is designed for the reverse rolling of high-precision and high-quality normal carbon steel, stainless steel strips, and low alloy steel. As a leading supplier in China, our products ensure exceptional performance and durability.

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Equipment Components and Features
Our state-of-the-art equipment includes an uncoiler, hydraulic coil car, unloading car, 5-roll pinch flattener, entrance and exit platforms, a rolling mill, left and right recoilers, a joint gear box, and hydraulic AGC and bending roll systems. Additionally, the driving motor, electric control system, and comprehensive lubrication solutions contribute to the efficiency and reliability of our factory’s offerings.

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    The Theory of Four Roll Rolling Mill

    ⚡ The four roll rolling mill system is composed of two support rolls and two working rolls, working in coordinated action to achieve precise metal deformation.

    During milling, through pressing cylinder or mechanical pressing device, the pressing force will transmit to support roll bearing stand, support roll, working roll, and finally act on the rolled piece. The workpiece height will be reduced (become thinner), length extended (become longer), then to meet the expected specifications.

    Due to the impact of pressing force, rollers will become bending, the workpiece edges will become thinner. Rollers need grinding its convexity according to practical situation.

    The Theory of Four Roll Rolling Mill

    📋 Product Introduction

    The four-high reversing cold rolling mill is an important metal pressure processing equipment, widely used in metallurgy, mechanical manufacturing, non-ferrous metal processing and other industries. It performs cold rolling on metal materials through the coordinated action of four rolls, achieving material thinning, surface quality improvement and mechanical property enhancement.

    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 the stability and accuracy of the rolling process. The reversible design enables the rolling mill to roll in both forward and reverse directions without frequent adjustments to the position of the rolled piece or the rolling mill, significantly improving production efficiency.

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    Wide Industry Application Metallurgy, mechanical manufacturing, non-ferrous metal processing and more.
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    Reversible Rolling Design Supports both forward and reverse rolling directions for higher efficiency.
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    High Precision Output Strict thickness, width, surface quality and mechanical property control.
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    Reliable Structure Work rolls + backup rolls minimize deflection and ensure rolling stability.

    In terms of application scenarios, the four-high reversible cold rolling mill is mainly used for rolling various metal strips and plates, such as stainless steel, carbon steel, alloy steel, copper, and aluminum. It can meet the strict requirements of different industries for material thickness, width, surface quality, and mechanical properties. For example, in the automotive manufacturing industry, the plates rolled by the four-high reversible cold rolling mill are used for body panels and require high strength, good formability, and corrosion resistance; in the electronic and electrical industry, the strips rolled are used to manufacture various precision components and require high surface finish and dimensional accuracy.

    In terms of industry standards, the design, manufacture, and acceptance of four-high reversing cold rolling mills follow strict standards and regulations. These standards cover multiple aspects such as the structure, performance, safety, and environmental protection of the rolling mill, ensuring its stable and reliable operation during operation and the safety of operators. Parameters such as the rolling force, rolling speed, and roll diameter of the rolling mill are clearly specified to ensure the stability of the rolling process and the consistency of rolling quality.

    In addition, the operation and maintenance of the four-high reversible cold rolling mill are also very important. Operators need to undergo professional training, be familiar with the structure, performance, and operating procedures of the rolling mill, and be able to correctly adjust the parameters of the rolling mill and handle various problems that occur during the rolling process. At the same time, regular maintenance and servicing are also key to ensuring the long-term stable operation of the rolling mill. This includes aspects such as roll replacement, lubrication system inspection, and electrical system maintenance.

    📊 Technical Parameter Table

    Mill Model / Technical Parameter 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) 5000 6000 7500
    Support Roll Specification (mm) Φ550×600 ¢650×700 ¢700×820
    Middle Roll Specification (mm) ———— ———— Φ300/Φ280×820
    Working Roll Specification (mm) Φ185/Φ165×650 ¢205/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) ¢610×650 ¢610×750 ¢610×850
    Recoiler (Specifications) ¢508×650 ¢508×750 ¢508×850
    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. The design and production can be tailor-made according to user's requirements.

    Frequently Asked Questions (FAQ)

    Q1 What is a four-high reversing cold rolling mill and how does it work?
    A four-high reversing cold rolling mill consists of two work rolls and two backup rolls. The work rolls directly contact the metal strip to apply rolling deformation, while the backup rolls support the work rolls to minimize deflection. The reversing design allows rolling in both forward and reverse directions, reducing the need to reposition the material and significantly improving production efficiency. The pressing force is transmitted through a hydraulic or mechanical pressing device to progressively reduce material thickness to the desired specification.
    Q2 What materials can be processed by the four-high reversing cold rolling mill?
    The four-high reversing cold rolling mill is suitable for processing a wide range of metallic materials, including carbon steel, low alloy steel, stainless steel, alloy steel, copper, and aluminum. It can meet stringent requirements for thickness, width, surface quality, and mechanical properties across various industries including automotive, electronics, and construction.
    Q3 What are the available mill models and their key differences?
    Three standard mill models are available: 650, 750, and 850. The primary differences lie in their rolling capacity: the Model 650 supports material widths of 400–550 mm with a pressing force of 5,000 KN; the Model 750 handles 500–650 mm widths at 6,000 KN; and the Model 850 accommodates 600–750 mm widths with 7,500 KN pressing force and additionally includes a middle roll specification. Rolling speeds also increase from 360 m/min (650) to 540 m/min (850). Custom configurations are available upon request.
    Q4 What control system and electrical components are used in the rolling mill?
    All three mill models are equipped with Siemens 6RA70 DC speed regulators and Siemens PLC electric control systems. The pressing method employs Hydraulic AGC (Automatic Gauge Control) for high-precision thickness management. The main drive uses DC motors paired with a joint gear box speed reducer, ensuring reliable and efficient operation across all rolling speeds.
    Q5 Why do the rollers need convexity grinding during operation?
    Under the high pressing forces involved in cold rolling, the rollers experience elastic bending deflection. This bending causes the edges of the rolled strip to become thinner than the center, resulting in uneven thickness distribution. To compensate for this deflection, the rolls are ground with a slight convex profile (crown) before use. The degree of convexity is determined by the actual rolling conditions, including material properties, rolling force, and strip width, ensuring uniform thickness across the full width of the rolled product.
    Q6 Can the rolling mill parameters be customized for specific production requirements?
    Yes. While the standard models (650, 750, 850) cover a wide range of industrial applications, the design and production of four-high reversing cold rolling mills can be fully tailor-made to meet specific user requirements. This includes customization of rolling force, rolling speed, roll dimensions, material width capacity, coiler/uncoiler specifications, and control system configurations. Please contact us with your detailed production requirements for a customized solution.