High Precision Reversing Cold Rolling Mill - China Suppliers and Factory for Carbon and Stainless Steel Processing
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 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
The six roll rolling mill adds a pair of middle rolls that move symmetrically and axially. By adjusting the movement of the middle rolls for different strip widths, it alters the roll contact pressure distribution and bending force, eliminating harmful contact between work rolls and support rolls to precisely manage plate shape and convexity.
The mill is suitable for carbon steel, low alloy steel, stainless steel, common steel, aluminum, and copper strips.
The mill can reduce raw material thicknesses of 1.5 to 4.5 mm down to finished gauges between 0.15 and 2.0 mm, achieving a high rolling accuracy of up to ±0.02 mm.
The rolling speed ranges from 360 to 1000 m/min (800–900 m/min on standard 950–1380 models). The system integrates Hydraulic AGC, Siemens 6RA70 DC speed regulators, and Siemens PLC automated electrical controls.
It is widely utilized in strip steel cold rolling lines and deep metal processing for industries such as automotive manufacturing, home appliances, and the energy sector.
Yes, all technical parameters and models presented in the table are for reference, and the design and manufacturing can be tailor-made to meet specific customer requirements.