Φ85/Φ350×450 4 hi cold rolling mill

The Φ85/Φ350×450 4 hi cold rolling mill is a high-precision, high-efficiency metal processing machine designed for the cold rolling of various metallic strips including carbon steel, alloy steel, copper, aluminum, and stainless steel. As a core product in the portfolio of HANI, this four-high (4 hi) cold rolling mill combines advanced mechanical design with intelligent control systems to deliver superior surface finish, dimensional accuracy, and consistent mechanical properties across a wide range of input and output specifications.

In modern metal fabrication industries—ranging from automotive and aerospace to electronics and construction—the demand for ultra-thin, high-strength, and dimensionally stable metal strips continues to grow. The 4 hi cold rolling mill architecture addresses these challenges by employing two small-diameter work rolls supported by two larger backup rolls, which significantly reduces roll deflection and enables precise thickness control even at minimal gauges. This configuration is especially critical when processing hard-to-deform materials like stainless steel or high-strength alloys.

Technical Advantages of the Φ85/Φ350×450 4 Hi Cold Rolling Mill

The model designation “Φ85/Φ350×450” refers to the diameter of the work rolls (85 mm), the diameter of the backup rolls (350 mm), and the maximum rolling width (450 mm). This specific geometry optimizes the balance between rigidity, power transmission, and strip handling capability. Key technical strengths include:

• High Rolling Force Capacity: Equipped with a 200-ton hydraulic system, the mill ensures stable deformation under heavy loads.
• Versatile Material Compatibility: Processes a broad spectrum of metals—from soft aluminum to hardened stainless steel.
• Precision Thickness Control: Achieves final thicknesses as low as 0.02 mm with tight tolerances (±0.005 mm achievable with optional AGC systems).
• Adjustable Drive Configuration: Can be configured for either work roll or backup roll drive, allowing optimization based on material type and reduction ratio.
• Integrated Tension Control: Paired with a telescopic-type recoiler for consistent coil quality and minimal edge defects.

HANI has engineered this 4 hi cold rolling mill to meet international standards for performance, safety, and energy efficiency. Its modular design facilitates easy maintenance, while the electrical control system supports both DC motor drives and AC variable-frequency drives (VFD), offering flexibility for different plant infrastructures.

Applications Across Industries

The versatility of the Φ85/Φ350×450 4 hi cold rolling mill makes it indispensable in multiple sectors:

• Electronics: Production of thin copper and nickel strips for batteries, connectors, and flexible circuits.
• Automotive: Manufacturing of high-strength steel strips for fuel systems, sensors, and structural components.
• Construction: Cold-rolled stainless steel for architectural cladding and roofing with enhanced corrosion resistance.
• Appliances: Aluminum and coated steel strips for heat exchangers, panels, and internal components.

By enabling consistent production of narrow-width, ultra-thin strips with excellent flatness and surface quality, this 4 hi cold rolling mill helps manufacturers reduce downstream processing costs and improve product reliability.

Technical Specifications

The following table summarizes the key parameters of the Φ85/Φ350×450 4 hi cold rolling mill. Note that certain values (e.g., motor power) may be adjusted based on customer-specific requirements and material characteristics.

These specifications reflect decades of metallurgical engineering experience. The choice of 85 mm work rolls minimizes contact arc length, reducing rolling torque and enabling finer reductions—critical for achieving sub-0.1 mm thicknesses without edge cracking or center buckle.

Why Choose a 4 Hi Configuration?

Compared to 2-high mills, the 4 hi cold rolling mill offers superior stiffness and reduced elastic deformation of the rolls during operation. In a 2-high mill, large-diameter rolls are required to prevent bending under load, but this increases the contact area and rolling force, limiting the minimum achievable thickness. The 4-high design decouples support from deformation: small work rolls handle the actual strip reduction, while large backup rolls absorb the reaction forces.

This architecture is particularly effective for cold rolling because:

• It allows higher reduction ratios per pass.
• It improves strip flatness through better roll crown control.
• It extends roll life by distributing stress more evenly.
• It enables the use of harder, wear-resistant work roll materials (e.g., tungsten carbide) without compromising structural integrity.

For producers targeting high-value, precision strip markets, the investment in a 4 hi cold rolling mill like the Φ85/Φ350×450 model delivers rapid ROI through yield improvement, energy savings, and expanded product capabilities.

Integration and Automation Options

HANI offers customization options to enhance productivity and data traceability:

• Automatic Gauge Control (AGC): Real-time thickness monitoring via X-ray or beta gauges with closed-loop feedback.
• Edge Position Control (EPC): Keeps strip centered during high-speed operation.
• Remote Diagnostics: IoT-enabled monitoring for predictive maintenance.
• Energy Recovery Systems: Regenerative braking on main motors to reduce power consumption.

These upgrades transform the Φ85/Φ350×450 4 hi cold rolling mill from a standalone machine into a smart manufacturing node within Industry 4.0 environments.

Frequently Asked Questions (FAQ)

Conclusion

The Φ85/Φ350×450 4 hi cold rolling mill represents a benchmark in precision strip rolling technology. Engineered for reliability, flexibility, and performance, it empowers metal processors to meet the exacting demands of modern industrial applications. Whether you’re producing conductive copper foils for EV batteries or corrosion-resistant stainless strips for medical devices, this 4 hi cold rolling mill delivers the consistency and quality your customers expect.

Backed by HANI’s commitment to innovation and customer success, this machine is more than equipment—it’s a strategic asset for growth in the competitive global metals market. With over 200 installations worldwide, the proven design of this 4 hi cold rolling mill continues to set standards in efficiency, accuracy, and operational economy.

For technical consultation, custom configuration, or quotation, contact HANI today to explore how the Φ85/Φ350×450 4 hi cold rolling mill can transform your production capabilities.