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    4 HI REVERSING COLD ROLLING MILL

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    6 Hi Reversing Cold Rolling Mill
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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 reversing rolling mill is designed for high precision processing of normal carbon steel, stainless steel strips, and low alloy steel. It ensures top-notch quality and efficiency, making it an ideal choice for manufacturers in need of reliable solutions.

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    COMPONENTS AND FEATURES OF THE EQUIPMENT
    Our rolling mill system includes an Uncoiler, Hydraulic coil car, and unloading car, a 5 Roll pinch flattener, Entrance and exit platforms, along with a robust Rolling mill. It features left and right recoilers, a Joint gear box, a Hydraulic AGC and bending roll system, a powerful driving motor, and an advanced Electric control system. The equipment is complemented by a comprehensive lubrication system designed for both equipment and process lubrication, emphasizing the quality and durability expected from China’s leading suppliers and factory.

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      Product Details

      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.

      ★ Core Structure & Design Feature

      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.

      • ▶ High Precision
        Rolling accuracy reaches ±0.02 mm; rolling speed 360–1000 m/min
      • ▶ Multi-Material Adaptability
        Suitable for stainless steel, common steel, aluminum and copper
      • ▶ Wide Thickness Range
        From 1.5–4.5 mm raw material down to 0.15–2.0 mm finished gauge
      • ▶ Automated Operation
        Integrated hydraulic systems, automatic control & auxiliary devices

      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

      QWhat is a six-high reversing cold rolling mill?
      A six-high reversing cold rolling mill is a high-precision metal processing machine equipped with six rolls arranged in three pairs: working rolls, intermediate rolls, and backup rolls. Its reversing capability allows strip material to pass back and forth through the mill in multiple rolling passes, delivering precise thickness reduction, plate shape control, and superior surface quality at room temperature.
      QWhat materials can the six-high cold rolling mill process?
      The six-high cold rolling mill handles a wide range of metallic materials including stainless steel, carbon steel, low alloy steel, aluminum, and copper. It accepts raw material thicknesses from 1.5 mm to 4.5 mm and produces finished thin-gauge strip products down to 0.15 mm.
      QWhat rolling accuracy and speed does this equipment offer?
      The six-high reversing cold rolling mill achieves a rolling accuracy of ±0.02 mm, enabled by the Hydraulic AGC pressing system and Siemens PLC electric control. Rolling speeds typically range from 360 to 1000 m/min, with model-specific rated speeds of 800 m/min (Model 950) and 900 m/min (Models 1150 and 1380).
      QWhat is the advantage of a six-roll structure over a conventional four-roll mill?
      The six-roll configuration adds intermediate rolls between the working rolls and backup rolls. These intermediate rolls can shift axially to eliminate harmful direct contact between working and backup rolls, and allow precise adjustment of the inter-roll contact pressure distribution. The result is better plate shape control, reduced edge drop, improved strip flatness, and the ability to roll thinner gauges compared to a conventional four-roll mill.
      QWhich industries typically use six-high cold rolling mills?
      Six-high cold rolling mills serve multiple industries. They are widely applied in automotive manufacturing (body panels, structural components), home appliance production (enclosures, inner parts), the energy sector (transformer cores, silicon steel strips), and any metal processing field requiring high-precision, thin-gauge strip materials at high production efficiency.
      QCan the technical parameters be customized for specific production requirements?
      Yes. The three standard models (950, 1150, and 1380) are reference configurations covering the most common production needs. All design and manufacturing parameters — including roll dimensions, maximum rolling force, motor power, strip width range, rolling speed, and automation system — can be tailored to the customer's specific requirements and production conditions upon request.