China Suppliers Factory: High Precision Reversing Cold Rolling Mill for Carbon and Stainless Steel Strips
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.
Product Introduction
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The Six-High Reversing Cold Rolling Mill is a high-precision metal rolling equipment for multi-pass rolling of strip materials at room temperature — achieving thickness reduction, plate shape control and surface quality improvement.
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Six-High Structure Design
Consists of work rolls, intermediate rolls and backup rolls. Intermediate rolls move axially (oscillate); work rolls equipped with hydraulic bending roll devices for accurate plate shape control.
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Reversible Rolling Function
Strip is rolled back and forth in the mill, ensuring consistent thickness uniformity across all passes.
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High Precision & Adaptability
Suitable for stainless steel, carbon steel, aluminum and copper. Rolling accuracy reaches ±0.02 mm; rolling speed 360–1000 m/min.
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Automated Integration
Integrated with hydraulic systems, automatic control systems and auxiliary devices (uncoilers, thickness gauges) for fully automated operation.
Raw materials with thicknesses ranging from 1.5 to 4.5 mm can be rolled into thin-gauge finished products with thicknesses ranging from 0.15 to 2.0 mm. 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 12,000 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 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)
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What is the main advantage of a six-high rolling mill compared to a four-high rolling mill?
The six-high rolling mill adds an intermediate roll between the work roll and the backup roll. This intermediate roll can move axially, which eliminates the harmful contact zone between the work roll and backup roll. This design allows for more precise control of the pressure distribution across the roll width, resulting in superior plate shape control and convexity adjustment — especially when rolling thin-gauge or wide strips.
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What materials can the six-high reversing cold rolling mill process?
The six-high reversing cold rolling mill is suitable for a wide range of metallic materials, including stainless steel, carbon steel, low alloy steel, aluminum, and copper. It is designed to handle raw materials with an input thickness of 1.5 to 4.5 mm and produce finished products down to 0.15 mm in thickness.
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What rolling accuracy can the six-high reversing cold rolling mill achieve?
The equipment achieves a rolling accuracy of ±0.02 mm, which is critical for industries requiring tight dimensional tolerances such as automotive manufacturing, home appliances, and precision electronics. This is made possible through the Hydraulic AGC (Automatic Gauge Control) pressing system and Siemens PLC-based electric control.
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How does the reversible rolling function improve the production process?
The reversible rolling function allows the metal strip to pass back and forth through the mill multiple times without uncoiling and recoiling between passes. This multi-pass capability ensures highly uniform thickness distribution along the entire strip length, reducing material waste and improving overall production efficiency for small and medium batch rolling tasks.
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Can the six-high rolling mill be customized to meet specific production requirements?
Yes. The mill models and technical parameters listed in the specification table (950, 1150, 1380) are standard reference configurations. The equipment can be fully tailor-made according to each user's specific requirements, including rolling width, rolling force, motor power, roll specifications, and control system configurations.
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What control systems are integrated into the six-high reversing cold rolling mill?
The mill is equipped with a Siemens 6RA70 DC speed regulator for precise motor speed control and a Siemens PLC-based electric control system for automated process management. The pressing system uses Hydraulic AGC for real-time thickness feedback and adjustment. These systems work together to ensure stable, automated, and high-precision rolling operations.