High Precision Reversing Cold Rolling Mill for Carbon and Stainless Steel - China Suppliers Factory Equipment
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, mainly used for multi-pass rolling of strip materials at room temperature to achieve thickness reduction, plate shape control and surface quality improvement.
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The core feature 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.
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Characterized by high precision, strong adaptability and high efficiency. Suitable for various materials such as stainless steel, common steel, aluminum and copper. 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. Rolling accuracy can reach ±0.02 mm, and rolling speed is usually 360 to 1000 m/min.
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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 (FAQ)
Q
What is a six-high reversing cold rolling mill and how does it differ from a four-high mill?
A six-high reversing cold rolling mill uses six rolls — work rolls, intermediate rolls, and backup rolls — compared to the four rolls used in a conventional four-high mill. The additional pair of intermediate rolls can move axially, which eliminates harmful contact between the work rolls and backup rolls, enabling more precise plate shape control and better convexity adjustment for various strip widths.
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What materials can be processed by the six-high reversing cold rolling mill?
The equipment is suitable for a wide range of metallic materials including stainless steel, carbon steel, low alloy steel, aluminum, and copper. It is especially suited for applications requiring high-precision thin-gauge strips in industries such as automotive, home appliances, and energy.
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What thickness range can this rolling mill achieve?
The six-high reversing cold rolling mill can process raw materials with input thicknesses ranging from 1.5 to 4.5 mm and roll them down to finished product thicknesses between 0.15 and 2.0 mm, with a rolling accuracy of ±0.02 mm.
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What is the maximum rolling speed and pressing force of this equipment?
The rolling speed typically ranges from 360 to 1000 m/min (up to 900 m/min for the 1150 and 1380 models). The maximum pressing force varies by model: 9000 KN for the 950 model, 13000 KN for the 1150 model, and 15000 KN for the 1380 model.
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What control systems are used in the six-high reversing cold rolling mill?
The equipment utilizes Siemens 6RA70 DC speed regulators and Siemens PLC electric control systems, ensuring precise and reliable automated operation. The pressing method employs Hydraulic AGC (Automatic Gauge Control) for accurate thickness control throughout the rolling process.
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Can the technical parameters be customized to meet specific production requirements?
Yes. The models and parameters listed in the technical table are provided for reference only. The design and manufacturing of the six-high reversing cold rolling mill can be fully tailor-made according to the customer's specific process requirements, material types, strip widths, and output targets.