High Precision Reversing Cold Rolling Mill for Stainless and Carbon Steel - China Factory Suppliers
Four roll rolling mill system is composed of two pcs of support rolls and two pcs working rolls. During mill, through pressing cylinder or mechanical pressing device, the pressing force will transmit to support roll bearing stand, support roll, working roll, and finally act on rolled piece. The work piece height will be reduced (become thinner), length extended (become longer), then to meet the expected specifications.
Due to the impact of pressing force, rollers will become bending, the workpiece edges will become thinner, rollers need grinding its convexity according to practical situation.
The four-high reversing cold rolling mill is an important metal pressure processing equipment, widely used in metallurgy, mechanical manufacturing, non-ferrous metal processing and other industries. It performs cold rolling on metal materials through the coordinated action of four rolls, achieving material thinning, surface quality improvement and mechanical property enhancement.
From a technical perspective, the four-high reversing cold rolling mill consists of work rolls and backup rolls. The work rolls directly contact the rolled piece to perform rolling deformation, while the backup rolls support the work rolls to reduce their deflection and ensure the stability and accuracy of the rolling process. The reversible design enables the rolling mill to roll in both forward and reverse directions without frequent adjustments to the position of the rolled piece or the rolling mill, significantly improving production efficiency.
In terms of application scenarios, the four-high reversible cold rolling mill is mainly used for rolling various metal strips and plates, such as stainless steel, carbon steel, alloy steel, copper, and aluminum. It can meet the strict requirements of different industries for material thickness, width, surface quality, and mechanical properties. For example, in the automotive manufacturing industry, the plates rolled by the four-high reversible cold rolling mill are used for body panels and require high strength, good formability, and corrosion resistance; in the electronic and electrical industry, the strips rolled are used to manufacture various precision components and require high surface finish and dimensional accuracy.
In terms of industry standards, the design, manufacture, and acceptance of four-high reversing cold rolling mills follow strict standards and regulations. These standards cover multiple aspects such as the structure, performance, safety, and environmental protection of the rolling mill, ensuring its stable and reliable operation during operation and the safety of operators. For instance, parameters such as the rolling force, rolling speed, and roll diameter of the rolling mill are clearly specified to ensure the stability of the rolling process and the consistency of rolling quality.
In addition, the operation and maintenance of the four-high reversible cold rolling mill are also very important. Operators need to undergo professional training, be familiar with the structure, performance, and operating procedures of the rolling mill, and be able to correctly adjust the parameters of the rolling mill and handle various problems that occur during the rolling process. At the same time, regular maintenance and servicing are also key to ensuring the long-term stable operation of the rolling mill. This includes aspects such as roll replacement, lubrication system inspection, and electrical system maintenance.
| Mill Model / Technical Parameter | 650 | 750 | 850 |
|---|---|---|---|
| Material | Carbon steel and low alloy steel | Carbon steel and low alloy steel | Carbon steel and low alloy steel |
| Material Thickness (mm) | 2.0~3.0 | 2.0~3.0 | 2.0~3.5 |
| Material Width (mm) | 400~550 | 500~650 | 600~750 |
| Finish Thickness (mm) | 0.5~0.15 | 0.5~0.16 | 0.5~0.18 |
| Pressing Force (KN) | 5000 | 6000 | 7500 |
| Support Roll Specification (mm) | Φ550×600 | ¢650×700 | ¢700×820 |
| Middle Roll Specification (mm) | ———— | ———— | Φ300/Φ280×820 |
| Working Roll Specification (mm) | Φ185/Φ165×650 | ¢205/Φ190×750 | Φ225/Φ205×850 |
| Driving Method | Working roll driving | Working roll driving | Working roll driving |
| Main Motor | DC motor | DC motor | DC motor |
| Speed Reducer | Joint gear box | Joint gear box | Joint gear box |
| Uncoiler (Specifications) | ¢610×650 | ¢610×750 | ¢610×850 |
| Recoiler (Specifications) | ¢508×650 | ¢508×750 | ¢508×850 |
| Rolling Speed (m/min) | 360 | 450 | 540 |
| Uncoiler Tension (KN) | 30 | 35 | 45 |
| Recoiler Tension (KN) | 10~70 | 10~80 | 10~90 |
| 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.
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Q What is the main difference between a four-high rolling mill and a two-high rolling mill?A four-high rolling mill uses two work rolls and two backup rolls. The backup rolls support the work rolls, significantly reducing roll deflection and bending under high rolling forces. This allows for higher rolling precision, thinner finished thickness, and more consistent strip flatness compared to a conventional two-high mill, which uses only two rolls and is more prone to roll bending issues.
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Q What materials can be processed by the four-high reversing cold rolling mill?The four-high reversing cold rolling mill is suitable for processing a wide range of metallic materials, including carbon steel, low alloy steel, stainless steel, alloy steel, copper, and aluminum. The specific models (650, 750, 850) listed in the technical parameter table are primarily designed for carbon steel and low alloy steel, but custom configurations can be tailored to suit other materials upon request.
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Q What does "reversing" mean in a four-high reversing cold rolling mill?"Reversing" refers to the mill's ability to roll the metal strip in both forward and reverse directions without repositioning the coil. After each pass, the rolling direction is reversed, and the strip is re-rolled in the opposite direction. This process allows multiple rolling passes to achieve the desired thickness reduction without the need to uncoil and re-thread the material, greatly improving production efficiency and flexibility.
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Q What is Hydraulic AGC and why is it important in cold rolling?Hydraulic AGC (Automatic Gauge Control) is a pressing method that uses hydraulic cylinders combined with an automatic control system to precisely regulate the roll gap during rolling. It continuously monitors and adjusts the gap between working rolls in real time, compensating for variations caused by material thickness changes or mill elasticity. This ensures highly consistent finished strip thickness, which is critical for industries requiring tight dimensional tolerances, such as automotive and electronics manufacturing.
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Q Can the technical parameters of the rolling mill be customized?Yes. The models and parameters shown in the technical parameter table are standard reference specifications. The design and manufacturing of the four-high reversing cold rolling mill can be fully customized according to the user's specific production requirements, including rolling force, roll dimensions, rolling speed, material type, strip width, and control system configuration. Users are encouraged to contact the manufacturer with their specific requirements to receive a tailored solution.
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Q How should the four-high reversing cold rolling mill be maintained?Proper maintenance is essential for the long-term, stable operation of the rolling mill. Key maintenance activities include regular roll inspections and replacement when wear limits are reached, routine lubrication system checks to ensure adequate supply and oil quality, electrical system inspections including PLC and DC speed regulator checks, hydraulic system maintenance to prevent leaks and ensure stable pressure, and verification of alignment and mechanical components. Operators must be professionally trained and follow the prescribed maintenance schedule to minimize downtime and extend equipment lifespan.