Φ50/Φ200×200 4 Hi Cold Rolling Mill

The Φ50/Φ200×200 4 hi cold rolling mill is a high-precision, industrial-grade metal processing machine engineered for the production of ultra-thin metal foils such as gold, silver, and copper. Designed with advanced metallurgical principles and decades of rolling technology expertise, this 4 hi cold rolling mill delivers exceptional thickness control, surface finish quality, and mechanical consistency—critical for applications in electronics, aerospace, jewelry, and specialty manufacturing.

Manufactured by industry leaders like HANI and trusted by global fabricators, the Φ50/Φ200×200 configuration represents the optimal balance between compact footprint and powerful performance. With a maximum rolling force of 60 tons and precision-ground work rolls as small as 50 mm in diameter, this 4 hi cold rolling mill enables reduction ratios exceeding 98%, transforming feedstock as thick as 0.8 mm into finished foils down to 0.006 mm—without compromising structural integrity or surface smoothness.

Technical Advantages of the Φ50/Φ200×200 4 Hi Cold Rolling Mill

Unlike conventional two-high mills, the 4 hi cold rolling mill architecture employs two small-diameter work rolls supported by two larger backup rolls. This design dramatically reduces roll deflection under load, ensuring uniform pressure distribution across the entire strip width. For delicate materials like precious metal foils—which are prone to edge cracking, thickness variation, and surface defects—this rigidity is non-negotiable.

HANI’s implementation of this system integrates several key innovations:

• Precision hydraulic gap control for real-time roll gap adjustment during operation.
• Magnetic particle brake-equipped turret-type coiler for tension-controlled winding, preventing telescoping or wrinkling.
• Dual drive options: either work roll or backup roll transmission, selected based on material hardness and reduction requirements.
• Modular electrical control systems, including DC drives or AC inverters paired with PLCs for programmable pass schedules.

These features make the Φ50/Φ200×200 4 hi cold rolling mill not just a machine, but a complete foil production solution—capable of consistent, repeatable output even in high-mix, low-volume environments.

Technical Specifications

Note: Motor power may be adjusted according to material type, width, and desired throughput. HANI engineers recommend consultation for custom configurations involving harder alloys or wider strips.

Why Choose a 4 Hi Design for Foil Rolling?

In cold rolling, achieving sub-0.1 mm thickness demands extreme mechanical stability. A traditional two-high mill lacks the stiffness to prevent roll bending under high pressure, leading to center-thick profiles (“crown”) or edge thinning. The 4 hi cold rolling mill solves this by transferring load from the small, flexible work rolls to rigid backup rolls—effectively decoupling deformation resistance from roll geometry.

This principle, first formalized by Sims in the 1950s and refined through finite element analysis (FEA) in modern times, allows for:

• Higher reduction per pass (up to 50% in soft metals)
• Better flatness control without intermediate annealing
• Extended roll life due to reduced contact stress
• Lower energy consumption per ton of output

For producers of conductive foils used in flexible circuits or RF shielding, these advantages translate directly into yield improvement and cost savings. The Φ50/Φ200×200 4 hi cold rolling mill is thus not merely a capital asset—it’s a strategic tool for competitive differentiation.

Applications Across Industries

The versatility of this 4 hi cold rolling mill spans multiple high-value sectors:

• Electronics: Copper and silver foils for printed circuit boards (PCBs), electromagnetic interference (EMI) gaskets, and battery current collectors.
• Jewelry & Decor: Gold leaf production for art restoration, luxury packaging, and architectural finishes.
• Aerospace: Thin copper layers for thermal management in satellite components.
• Research & Development: Prototype foil batches for new alloy development or nanomaterial studies.

Each application benefits from the machine’s ability to maintain micron-level tolerances over long production runs—a capability validated by ISO 9001-certified manufacturers like HANI.

Integration and Support

HANI provides full lifecycle support for the Φ50/Φ200×200 4 hi cold rolling mill, including:

• On-site installation and operator training
• Custom roll grinding and profiling services
• Remote diagnostics via IoT-enabled control panels (optional)
• Spare parts inventory with global logistics

Moreover, the machine’s modular design allows future upgrades—such as adding automatic thickness gauges (ATG), edge position control (EPC), or even tandem stands for continuous processing.

Conclusion

The Φ50/Φ200×200 4 hi cold rolling mill stands as a benchmark in precision foil rolling technology. Combining robust mechanical design, intelligent controls, and application-specific engineering, it empowers manufacturers to meet the stringent demands of modern micro-engineering. Whether you’re producing conductive layers for next-gen wearables or decorative gold leaf for heritage conservation, this 4 hi cold rolling mill delivers reliability, repeatability, and return on investment.

Backed by HANI’s global service network and deep metallurgical expertise, it’s more than equipment—it’s your partner in precision metal forming.

For detailed quotations, layout drawings, or process simulation data, contact HANI’s technical sales team today.