China High Precision Reversing Cold Rolling Mill Suppliers | Quality Steel Production 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
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 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.
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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.
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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)
Q1
What is the key advantage of a six-high rolling mill over a four-high rolling mill?
The six-high rolling mill incorporates an additional pair of intermediate rolls that can move axially, which eliminates harmful contact between the working rolls and backup rolls. This enables more precise control over plate shape and strip convexity, especially for rolling narrow-to-wide strips with varying widths — a capability that standard four-high mills cannot achieve with the same level of precision.
Q2
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 is designed to handle raw material thicknesses from 1.5 mm to 4.5 mm and produce finished products as thin as 0.15 mm, making it ideal for industries requiring high-precision thin-gauge strip.
Q3
What rolling accuracy and speed can this equipment achieve?
The six-high reversible cold rolling mill offers a rolling thickness accuracy of up to ±0.02 mm, ensuring highly consistent product quality. The rolling speed typically ranges from 360 to 1000 m/min, with specific models such as the 950 achieving 800 m/min and the 1150 and 1380 models reaching up to 900 m/min.
Q4
What does "reversible rolling" mean and what are its benefits?
Reversible rolling means the strip material can be passed back and forth through the mill multiple times without uncoiling and recoiling between passes. This allows multi-pass thickness reduction in a single compact setup, improves thickness uniformity throughout the coil length, reduces equipment footprint compared to tandem mills, and is particularly cost-effective for small-to-medium production volumes and special material grades.
Q5
Which industries commonly use six-high reversing cold rolling mills?
Six-high reversing cold rolling mills are widely used across multiple industries, including the automotive industry (body panels, structural parts), home appliance manufacturing (refrigerator and washing machine shells), the energy sector (transformer laminations, battery casing materials), and construction and electronics where precise thin-gauge metal strips are required.
Q6
Can the six-high rolling mill be customized to specific production requirements?
Yes. The mill models and technical parameters listed in the specification table are standard reference configurations. The equipment can be fully tailor-made to meet the user's specific requirements, including custom roll dimensions, rolling force, strip width, motor power, automation level, and integration with upstream or downstream processing lines. Please contact our engineering team to discuss your project needs.