High Precision Reversing Cold Rolling Mill for Carbon and Stainless Steel - China Suppliers and Factory
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
What is the main working principle of a Six Roll Rolling Mill?
It adds a pair of intermediate rollers that move symmetrically and axially to eliminate harmful contact between work rolls and backup rolls. By shifting the middle rolls based on strip width, it controls contact pressure distribution and bending force for optimal plate shape and convexity.
What materials can be processed by this equipment?
The mill is highly adaptable and suitable for processing various metal strip materials including carbon steel, low alloy steel, stainless steel, aluminum, and copper.
What are the input and output thickness capabilities?
It can process raw materials with incoming thicknesses ranging from 1.5 to 4.5 mm down to ultra-thin finished products between 0.15 and 2.0 mm, achieving precision up to ±0.02 mm.
What rolling speeds can the 6-High Reversing Cold Rolling Mill achieve?
Depending on the exact model and specification (such as 950, 1150, or 1380), operational rolling speeds typically range from 360 m/min up to 1000 m/min.
What automation and control systems are integrated?
The equipment utilizes modern automation including Siemens PLC electric control, Siemens 6RA70 DC speed regulators, Hydraulic AGC pressing methods, and integrated thickness gauges.
Can the technical parameters be customized for specific production requirements?
Yes, all models and specifications listed in the technical table serve as references and can be fully tailor-made to fulfill tailored engineering requirements.