Continuous casting is a cornerstone of modern metal production, widely used in the manufacturing of steel, aluminum, and copper. The process enables the efficient transformation of molten metal into solid strands for further processing. However, maintaining stable thermal conditions throughout casting remains a critical challenge.
One of the most severe risks in continuous casting is a breakthrough—a failure of the solidified shell that leads to molten metal leakage. These events can result in equipment damage, production downtime, and serious safety hazards.
Today, infrared (IR) technology offers a powerful solution by enabling real-time monitoring and automation of the flux feeder, significantly improving process stability and safety.
The Challenge: Temperature Fluctuations and Flux Control
During continuous casting, molten metal is poured into a water-cooled mold where a solid shell begins to form. This shell must be strong enough to contain the liquid core as the strand moves downward.
However, fluctuations in temperature or improper flux application can destabilize this process. Key challenges include:
- variations in molten metal temperature
- inconsistent flux layer thickness
- uneven thermal distribution across the mold
- insufficient insulation of the molten surface
If the shell becomes too thin or weak, it can crack under internal pressure—resulting in a breakthrough.
Such incidents lead to:
- costly equipment damage
- unplanned production stops
- safety risks for plant personnel
The Role of Flux in Continuous Casting
The flux feeder plays a critical role in maintaining stable casting conditions. It supplies a controlled amount of flux onto the surface of the molten metal, where it forms a protective slag layer.
This layer serves several essential functions:
- thermal insulation of the molten metal
- stabilization of temperature gradients
- protection against oxidation
- lubrication between the mold and strand
However, the effectiveness of flux depends heavily on precise control.
- Too little flux → insufficient insulation → risk of breakthrough
- Too much flux → process instability and defects
Maintaining the correct flux thickness is therefore essential for consistent casting quality.
Infrared Technology as a Solution
Infrared thermal imaging introduces a non-contact method to monitor the process in real time. By measuring the surface temperature of the flux layer, IR cameras provide direct insight into thermal conditions inside the mold.
The key principle is simple:
flux surface temperature correlates with its thickness and insulation performance.
Using this data, operators can:
- detect temperature deviations instantly
- identify uneven flux distribution
- monitor critical zones within the mold
- respond before defects occur
Automating the Flux Feeder with IR Monitoring
By integrating an infrared camera such as the Optris Xi 410, the flux feeding process can be fully automated.
How it works:
- The IR camera is positioned above the mold or spreading channel
- It continuously measures the temperature of the flux surface
- Temperature data is transmitted to the control system (PLC)
- The flux feeder adjusts supply automatically based on real-time data
This closed-loop control ensures:
- stable temperature conditions
- consistent flux layer thickness
- reduced operator dependency
As long as molten metal temperature remains stable, the flux surface temperature becomes a reliable indicator for process control.
System Integration and Industrial Readiness
The Optris Xi 410 is designed for harsh industrial environments and offers seamless integration into casting systems.
Key capabilities include:
- standalone operation with direct analog or alarm outputs
- integration with PLC systems for automated control
- multiple outputs via industrial process interfaces
- compatibility with Optris PIX Connect software for analysis and monitoring
For demanding environments, the system can be equipped with:
- water-cooled protective housing (up to 250 °C ambient)
- air purge systems to prevent contamination from dust and fumes
- heat-resistant cables for reliable operation
These features ensure accurate and stable measurements even under extreme conditions.
Benefits of IR-Based Flux Feeder Automation
Implementing infrared-based automation delivers measurable advantages:
Process Stability
- consistent temperature across the mold
- reduced thermal fluctuations
Quality Improvement
- fewer surface defects and cracks
- improved strand integrity
Safety Enhancement
- prevention of molten metal leakage
- reduced risk of accidents
Cost Efficiency
- minimized production downtime
- lower maintenance and repair costs
Operational Efficiency
- real-time process control
- reduced need for manual intervention
As continuous casting processes become more advanced and production demands increase, the need for precise, real-time thermal control becomes essential.
Infrared technology enables a new level of automation by linking temperature monitoring directly to flux feeder control. This approach not only prevents critical failures such as breakthroughs but also enhances product quality, operational efficiency, and plant safety.
Automating the flux feeder with IR cameras is no longer just an innovation—it is becoming a standard for modern, high-performance casting operations.
