4 hi reversing 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
Our advanced 4 hi reversing cold rolling mill represents the pinnacle of metal processing technology, designed for precision cold rolling of various metal strip materials with exceptional efficiency and product quality.
The 4 hi reversing cold rolling mill stands as a cornerstone equipment in modern metal processing facilities worldwide. This sophisticated machinery enables manufacturers to achieve precise thickness reduction, exceptional surface finish, and controlled mechanical properties in a variety of metal strips through the cold rolling process. Unlike conventional rolling systems, the four-high configuration features two small-diameter work rolls supported by two larger backup rolls, creating an optimal force distribution system that minimizes roll deflection and enables processing of harder materials and thinner gauges with superior flatness control.
HANI has consistently delivered high-performance 4 hi reversing cold rolling mill systems that integrate cutting-edge automation with robust mechanical design. These systems represent the perfect balance between productivity, energy efficiency, and product quality, making them indispensable assets for manufacturers seeking competitive advantage in today’s demanding metal processing industry.
Technical Specifications and Configuration
The engineering excellence of our 4 hi reversing cold rolling mill is evident in its comprehensive technical specifications and modular design philosophy. Each component has been meticulously engineered to deliver maximum performance while maintaining operational flexibility across diverse production requirements.
| Parameter | Specification | Technical Details |
|---|---|---|
| Roll Configuration | 4-High Reversible | Two work rolls (Φ80-Φ140mm) with two backup rolls (Φ400mm) |
| Roll Barrel Length | 400mm | Maximum strip width processing capability |
| Roll Material | 9Cr2Mo | High-chromium alloy steel with excellent wear resistance and fatigue properties |
| Drive System | AC Variable Frequency | Italian Ansaldo four-quadrant drive with regenerative braking capability |
| Control System | Siemens S7-200 PLC | Programmable logic controller with HMI interface for process monitoring |
| Tension Control | Automatic Closed-loop | Analog constant tension control with real-time adjustment |
| AGC System | Hydraulic | Automatic gauge control with precision positioning accuracy ±0.005mm |
| Coiler Type | Hydraulic Four-prism Cone | Dual-side expandable mandrels with rapid change capability |
Advanced Engineering Principles
The scientific foundation underlying the 4 hi reversing cold rolling mill design incorporates several critical engineering principles that collectively enhance performance and product quality. The four-high configuration fundamentally addresses the limitations of two-high mills by significantly reducing roll deflection through proper backup roll support. This mechanical advantage translates to superior flatness control and the ability to process harder materials that would otherwise cause excessive work roll bending in conventional designs.
The backup rolls in our 4 hi reversing cold rolling mill system distribute rolling forces effectively, reducing the maximum bending moment on work rolls by approximately 60-70% compared to two-high configurations. This mechanical advantage enables processing of high-strength alloys and production of ultra-thin gauges with exceptional dimensional accuracy. The specialized 9Cr2Mo roll material selection provides optimal combination of surface hardness (approximately 60-65 HRC after heat treatment) and core toughness, ensuring extended roll life even under high-pressure rolling conditions.
The hydraulic AGC (Automatic Gauge Control) system represents another critical engineering advancement integrated into our 4 hi reversing cold rolling mill design. This system continuously monitors strip thickness through precision sensors and makes real-time adjustments to the roll gap position. The closed-loop control algorithm compensates for thermal expansion, roll wear, and material variations, maintaining consistent product thickness within tolerances as tight as ±0.005mm across the entire production run. This level of precision is essential for demanding applications in electronics, aerospace, and precision engineering industries where material consistency directly impacts downstream manufacturing processes.
Material Processing Capabilities
The versatility of our 4 hi reversing cold rolling mill extends across a comprehensive range of metallic materials, each requiring specific rolling parameters and process controls to achieve optimal results. This equipment has been engineered to accommodate the unique deformation characteristics and processing requirements of various material families.
| Material Category | Specific Alloys | Max Reduction Pass | Surface Finish Options |
|---|---|---|---|
| Carbon Steels | 1008, 1010, 1018, 1045 | 65-75% | Bright annealed, 2B, BA |
| Stainless Steels | 304, 316, 430, 410 | 50-60% | No.4 finish, mirror, hairline |
| Copper Alloys | C11000, C26000, C70600 | 75-85% | Bright, matte, embossed |
| Aluminum Alloys | 1100, 3003, 5052, 6061 | 70-80% | Mill finish, bright, brushed |
| Specialty Alloys | Inconel 625, Titanium Gr2, Nickel 200 | 35-45% | Custom finishes available |
The 4 hi reversing cold rolling mill achieves these impressive processing capabilities through precise control of multiple interrelated parameters. The rolling speed, typically ranging from 10 to 300 meters per minute depending on material type and reduction requirements, is carefully synchronized with tension control systems to prevent material slippage or stretching. The roll gap positioning accuracy of ±0.001mm ensures consistent thickness distribution across the strip width, while the automatic flatness control system continuously monitors and corrects for edge wave or center buckle conditions through differential roll bending mechanisms.
Frequently Asked Questions
Q: What is the maximum hardness material that can be processed on your 4 hi reversing cold rolling mill?
A: Our standard 4 hi reversing cold rolling mill configuration can process materials with hardness up to 450 HB (Brinell hardness). With specialized roll materials and enhanced drive systems, we can configure the mill for materials up to 550 HB. For extremely hard materials, we recommend multi-pass processing with intermediate annealing to achieve the desired final thickness while maintaining strip integrity.
Q: How does the automatic gauge control system compensate for thermal expansion during extended production runs?
A: Our advanced AGC system incorporates multiple compensation strategies for thermal effects. Temperature sensors continuously monitor roll body temperatures at critical points, and the control algorithm applies pre-calculated thermal expansion coefficients to adjust the roll gap position proactively. Additionally, the system utilizes X-ray or beta-ray thickness gauges positioned after the mill stand to provide real-time feedback for closed-loop correction. This dual approach ensures consistent strip thickness within ±0.005mm tolerance even during 12+ hour production campaigns.
Q: What is the expected roll life for stainless steel processing applications?
A: Roll life varies significantly based on material type, reduction ratio, and surface finish requirements. For standard 304 stainless steel processing with moderate reductions (40-50%), our 9Cr2Mo work rolls typically achieve 150-200 tons of throughput before requiring regrinding. For more abrasive materials like 440C stainless or high-nickel alloys, this may decrease to 80-120 tons per grinding cycle. Our backup rolls, manufactured from high-alloy forged steel with specialized heat treatment, typically last 3-5 times longer than work rolls under similar processing conditions.
Q: Can your 4 hi reversing cold rolling mill be upgraded with digital twin technology for predictive maintenance?
A: Yes, our modern 4 hi reversing cold rolling mill systems are designed with Industry 4.0 integration capabilities. We offer optional IoT sensor packages that monitor critical parameters including vibration spectra, bearing temperatures, hydraulic pressures, and electrical motor performance. This data feeds into our cloud-based analytics platform that creates a digital twin of your specific mill configuration. The system provides predictive maintenance alerts, performance optimization recommendations, and process parameter suggestions based on historical production data. This technology typically reduces unplanned downtime by 35-45% and extends component life through optimized operational practices.
Q: What is the typical installation and commissioning timeline for a complete 4 hi reversing cold rolling mill system?
A: From contract signing to production readiness, the complete implementation timeline averages 6-8 months for a standard 4 hi reversing cold rolling mill system. This includes 3-4 months for manufacturing and factory acceptance testing, 1-2 months for shipping and site preparation, and 4-6 weeks for installation, mechanical completion, and production qualification. Our experienced commissioning teams work closely with your production staff to ensure smooth technology transfer and operator proficiency. HANI provides comprehensive operator training programs and ongoing technical support to maximize your equipment utilization from day one of production.
Production Economics and ROI Analysis
The economic advantages of implementing a modern 4 hi reversing cold rolling mill extend far beyond the initial capital investment. Our comprehensive lifecycle cost analysis demonstrates significant operational savings through reduced energy consumption, minimized scrap generation, extended tool life, and decreased maintenance requirements compared to conventional rolling systems.
The energy-efficient drive system in our 4 hi reversing cold rolling mill configuration typically reduces power consumption by 18-22% compared to older DC drive technologies. This efficiency gain results from the regenerative braking capability that feeds energy back to the grid during deceleration phases, high-efficiency power conversion electronics, and optimized motor sizing based on actual load profiles rather than peak demand requirements. For a typical production facility operating two shifts daily, these energy savings can amount to $45,000-$65,000 annually depending on local electricity rates.
Material yield improvements represent another significant economic advantage of our 4 hi reversing cold rolling mill technology. The precise gauge control and edge conditioning capabilities reduce end scrap by approximately 1.5-2.0% per coil compared to conventional mills. For facilities processing 10,000 tons annually of high-value alloys such as stainless steel or specialty copper alloys, this translates to material cost savings exceeding $180,000 per year at current market rates. The superior surface quality achieved through optimized roll grinding patterns and precision lubrication systems further enhances product value by reducing or eliminating secondary finishing operations.
The modular design philosophy incorporated into our 4 hi reversing cold rolling mill systems also contributes to favorable economic performance through simplified maintenance procedures and component standardization. Critical wear items such as roll bearings, seals, and hydraulic components utilize industry-standard specifications, reducing inventory requirements and enabling rapid replacement during scheduled maintenance windows. The mean time between failures (MTBF) for our standard mill configuration exceeds 3,500 operating hours, substantially higher than the industry average of 2,200 hours for comparable equipment.
Conclusion
The 4 hi reversing cold rolling mill represents the optimal solution for manufacturers seeking to enhance product quality, operational efficiency, and production flexibility in strip metal processing operations. Through thoughtful integration of mechanical precision, advanced control systems, and material science expertise, this equipment delivers exceptional performance across a diverse range of materials and finishing requirements.
Our commitment to continuous improvement ensures that each 4 hi reversing cold rolling mill we deliver incorporates the latest technological advancements while maintaining the reliability and serviceability that our customers have come to expect. The comprehensive technical support network, availability of genuine spare parts, and ongoing engineering expertise provide customers with confidence that their investment will deliver maximum value throughout its operational lifecycle.
For metal processors seeking to elevate their production capabilities while optimizing operational economics, our 4 hi reversing cold rolling mill systems offer the perfect balance of technological sophistication and practical reliability. Contact our application engineers today to discuss your specific production requirements and discover how our customized solutions can transform your manufacturing operations.
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.
