Φ400×750 2 hi cold rolling mill
Brand name: HANI
Packing Details : Wooden box with fumigation or Wooden Fram or Steel Frame
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
HANI focuses on cold rolling mill equipment technology, safeguarding your production.
Product Details
In the dynamic world of metal processing equipment, the 2 hi cold rolling mill represents a cornerstone technology for precision metal forming. The Φ400×750 2 hi cold rolling mill stands as a testament to engineering excellence, designed to deliver exceptional performance across a wide range of industrial applications. This comprehensive guide explores the technical specifications, operational advantages, and practical applications of this sophisticated machinery.
Advanced Engineering for Precision Metal Processing
The Φ400×750 2 hi cold rolling mill embodies the perfect balance between robust construction and precision engineering. With a roll diameter of 400mm and an effective roll body length of 750mm, this machine provides exceptional stability during high-pressure rolling operations. Unlike conventional mills, this 2 hi cold rolling mill configuration features two horizontally arranged work rolls that apply uniform pressure across the entire width of the material being processed.
Manufactured with premium-grade alloy steel, the rolls undergo specialized heat treatment processes to achieve optimal surface hardness of HRC 58-62. This critical specification ensures extended service life even when processing high-strength alloys and abrasive materials. The precision-ground roll surfaces maintain tolerances within ±0.005mm, guaranteeing consistent product quality and dimensional accuracy throughout extended production runs.
Technical Innovation in Drive Systems
The power transmission system of this 2 hi cold rolling mill incorporates advanced AC vector control technology with regenerative braking capability. The main drive motor (75-90kW) delivers precise torque control across the entire speed range, while the hydraulic system provides rapid response to changing load conditions. This integration of mechanical and electronic systems creates a responsive, energy-efficient rolling platform that outperforms conventional DC drive systems in both reliability and operational cost.
Technical Specifications
| Parameter | Specification | Technical Details |
|---|---|---|
| Roll Configuration | 2-Hi (Two-high) | Horizontal arrangement with hydraulic roll gap adjustment |
| Roll Dimensions | Φ400×750mm | Work roll diameter × effective roll length |
| Rolling Force | 200 Tons | Maximum separating force with safety factor of 1.5 |
| Rolling Speed | 0-0.4 m/s | Infinitely variable with digital speed control |
| Raw Material Thickness | ≤5mm | Maximum entry thickness for single-pass reduction |
| Finished Product Thickness | ≥0.3mm | Minimum achievable thickness with standard setup |
| Material Width Range | 400-650mm | Adjustable side guides with digital positioning |
| Drive System | 75-90kW | AC vector control with regenerative braking |
| Control System | PLC + HMI | Programmable logic controller with 10.1-inch touchscreen interface |
| Roll Changing | Hydraulic | Automatic roll changing system with alignment verification |
| Coolant System | Integrated | High-pressure spray system with filtration and temperature control |
Processing Capabilities and Material Compatibility
The versatility of this 2 hi cold rolling mill extends to its exceptional material compatibility. Engineered to process a comprehensive range of metals and alloys, this machine handles everything from standard carbon steels to specialized high-performance materials.
Ferrous Metals Processing
The mill achieves reduction ratios up to 85% in a single pass when processing low-carbon steels (AISI 1008-1020). For medium carbon grades (AISI 1045-1060), the system maintains surface finish quality at Ra 0.8μm while achieving dimensional tolerances of ±0.01mm.
Non-Ferrous Applications
Copper alloys (C11000, C26000) and aluminum grades (1100, 3003, 5052) achieve exceptional surface quality with minimal edge cracking. The mill’s precise tension control system prevents slippage during thin-gauge rolling operations down to 0.3mm thickness.
Specialty Alloys
Stainless steels (304, 316), nickel alloys (Inconel 625), and titanium grades (Grade 2, Grade 5) can be processed with appropriate intermediate annealing cycles. The mill’s robust frame design minimizes deflection even at maximum rolling forces.
Scientific Principles Behind Cold Rolling Performance
The operational excellence of this 2 hi cold rolling mill stems from its adherence to fundamental metallurgical principles. During cold rolling operations, metals experience strain hardening that increases yield strength by up to 300% while reducing ductility proportionally. The Φ400×750 configuration provides optimal contact arc length for controlled strain distribution across the workpiece cross-section.
Thermal management represents another critical aspect of cold rolling technology. Friction between rolls and workpiece generates significant heat (up to 200°C at the interface), which this 2 hi cold rolling mill addresses through its integrated high-pressure coolant system. Temperature-controlled emulsions maintain consistent lubrication properties while dissipating heat to prevent metallurgical transformations during processing.
Roll Deflection Compensation Technology
The mill incorporates a proprietary crown control system that compensates for roll bending under load. Finite element analysis has determined that at maximum rolling force (200 tons), conventional rolls would deflect by approximately 0.15mm at center span. This 2 hi cold rolling mill counteracts this deflection through precision-ground roll crowns and hydraulic bending systems, maintaining flatness tolerances within 0.05mm across the entire strip width.
Advantages Over Conventional Rolling Equipment
When compared to traditional rolling solutions, the Φ400×750 2 hi cold rolling mill demonstrates significant advantages in multiple performance metrics. Its monobloc cast steel frame provides superior rigidity compared to fabricated frames, reducing vibration by up to 40% during high-speed operations.
The hydraulic roll gap adjustment system achieves positioning accuracy of ±0.01mm, significantly outperforming mechanical screw-down systems commonly found in older equipment. This precision translates directly to product quality, with thickness variation reduced to less than 0.5% across the entire coil width. HANI has recognized these performance advantages in their recent facility expansion, selecting this 2 hi cold rolling mill configuration for their high-precision strip production line.
Energy efficiency represents another significant advantage. The regenerative braking system captures kinetic energy during deceleration phases, returning up to 35% of this energy to the power grid. Combined with the high-efficiency gear drive system (98% mechanical efficiency), the mill reduces power consumption by approximately 22% compared to conventional DC-drive systems of equivalent capacity.
Practical Maintenance and Operational Guidelines
Maximizing the service life and performance of your 2 hi cold rolling mill requires adherence to established maintenance protocols. The roll bearing assemblies should be inspected every 500 operating hours, with lubricant analysis performed quarterly to detect early signs of wear or contamination. The hydraulic system requires filter changes after every 1,000 operating hours, with complete fluid replacement recommended annually.
Roll surface maintenance represents a critical aspect of mill upkeep. Work rolls should be removed and reground when surface roughness exceeds Ra 0.4μm or when visible wear patterns develop. Proper roll grinding technique maintains the original crown profile within ±0.005mm tolerance, ensuring consistent strip flatness during subsequent production runs.
The control system software includes comprehensive diagnostic capabilities that monitor over 200 operational parameters in real-time. When properly configured, these systems can predict maintenance requirements up to 30 days in advance, allowing for planned downtime rather than emergency repairs. This predictive maintenance approach has demonstrated a 65% reduction in unplanned downtime across installations of this 2 hi cold rolling mill configuration.
Frequently Asked Questions
Conclusion: Investment in Advanced Rolling Technology
The Φ400×750 2 hi cold rolling mill represents more than just equipment—it’s a strategic investment in manufacturing capability and product quality. By integrating advanced mechanical design with intelligent control systems, this machine delivers exceptional performance across diverse applications while minimizing operational costs. With proper maintenance and operation, this 2 hi cold rolling mill provides reliable service for 20+ years, continuously producing high-quality rolled products that meet the most demanding industry specifications. As manufacturing continues to evolve toward greater precision and efficiency, this 2 hi cold rolling mill stands ready to meet the challenges of tomorrow’s metal processing requirements. For facilities like HANI seeking to enhance their production capabilities while maintaining competitive advantage, this technology represents an optimal solution for precision cold rolling applications.
HANI is one of China’s leading professional cold rolling mill manufacturers, providing complete cold rolling systems to steel companies worldwide. HANI focuses on designing and manufacturing integrated cold rolling solutions that meet the industry’s highest standards of precision, efficiency, and durability. Our engineering expertise lies in providing turnkey cold rolling production lines to optimize the performance of modern steel manufacturing plants.
