High Precision Reversing Cold Rolling Mill for Carbon and Stainless Steel - China Suppliers & Factory Solutions
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
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.
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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Q What is the main advantage of a six-high rolling mill compared to a four-high rolling mill?The six-high rolling mill adds a pair of intermediate rolls between the work rolls and backup rolls. These intermediate rolls can move axially, which eliminates harmful contact between work rolls and backup rolls, allows more precise control of roll contact pressure distribution, and significantly improves plate shape accuracy and strip flatness — especially for thin and wide strip materials.
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Q 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 carbon steel, low alloy steel, stainless steel, aluminum, and copper. It can handle raw material thicknesses from 1.5 to 4.5 mm and produce finished products as thin as 0.15 mm.
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Q What rolling accuracy and speed can this equipment achieve?The six-high reversing cold rolling mill can achieve a rolling thickness accuracy of ±0.02 mm. The rolling speed ranges from 360 to 1000 m/min depending on the mill model and material requirements, ensuring both high precision and high productivity.
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Q What does the "reversing" function mean in this mill, and what are its benefits?The "reversing" function means the strip can be rolled back and forth through the mill in multiple passes without needing to transfer it to another machine. This ensures highly uniform thickness distribution along the entire strip length, reduces equipment footprint, and makes it especially suitable for rolling a variety of products in small to medium production volumes.
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Q Which industries commonly use the six-high reversing cold rolling mill?This equipment is widely used in industries that demand high-precision metal strips, including the automotive industry (body panels, structural parts), home appliance manufacturing (washing machine drums, refrigerator shells), the energy sector (transformer cores, battery materials), and general metal processing for electronics and construction applications.
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Q Can the technical parameters of the six-high rolling mill be customized?Yes. The mill models (950, 1150, 1380) and their parameters listed in the technical table are standard references. The design and manufacturing can be fully tailor-made according to specific user requirements, including material type, strip width, rolling force, motor power, and automation control level, ensuring the equipment meets unique production demands.