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Transverse Flux Heating (TFH) Technology
Achieving Thermal Uniformity and Hot Rolling Efficiency.
PURPOSE
TFH compensates for the natural temperature drop in a hot transfer bar before it enters the finishing mill, which typically causes uneven mechanical properties across the strip.
TECHNOLOGY
An advanced induction heating system using two face-to-face inductors.
It generates eddy currents via a transverse AC magnetic flux directly through the bar, ensuring instant and efficient heating.
EQUIPMENT OVERVIEW
- The equipment features two inductor cars, each with an inductor, moving on rails.
- A hydraulic handling mechanism provides horizontal movement from parked to operating positions and vertical movement to maintain a minimal 20 mm gap above any bar thickness.
- Powered by medium-frequency converters and controlled by PLC/PC units for precise, automated management.
- Integrated cooling circuits ensure optimal temperature levels.
PROCESS & PERFORMANCES
- Direct Internal Heating: eddy currents concentrate heat precisely within the bar’s cross-section.
- Instantaneous Response: coil current dynamically adapts to bar thickness, speed, and heating targets (ΔT), providing immediate and precise temperature control.
- Uniformity Control: independent regulation of each inductor’s power ensures head-to-tail temperature equalization, crucial for consistent rolling behavior.
KEY BENEFITS
- Enhanced Product Quality: eliminates flame-based heating defects (e.g., black spots), significantly reduces scale formation, and ensures improved elongation and uniform mechanical properties across the entire bar width and length.
- Operational Efficiency: facilitates better thickness control at thin gauges, reduces wear on working rolls, and allows for more flexible scheduling.
- Environmental Friendliness: operates with no combustion emissions, smoke, or waste heat.
- Rapid ROI: boosts yield and quality, typically leading to a return on investment in less than one year.
