Endless Rolling Layout for Uniform Slab Temperature Control
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Solution Overview
Problem
Existing thin slab continuous casting and endless rolling technologies face challenges in achieving uniform temperature control, leading to non-uniform temperature fields and defects in the final product, which affect the quality and efficiency of the rolling process.
Innovation Solution
The method involves a process flow that includes a double regenerative soaking furnace for double-sided heating, a transverse and longitudinal magnetic bonding induction heating arrangement to ensure uniform temperature distribution, and a standby rolling mill to maintain continuous production and product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If one-way magnetic flux induction heating technology is used, then heating time is reduced (10-30s), but temperature field uniformity deteriorates, causing skin effect and edge effect
Solution Approach 1:
The induction heating system is divided into multiple independent heating zones along the rolling direction, with each zone having separately controllable power supply. This segmentation allows different regions to be heated to different temperature levels simultaneously, enabling precise control of temperature distribution and eliminating the uniform temperature field problem while maintaining fast heating speed.
Solution Approach 2:
Different regions of the slab receive different heating intensities according to their specific requirements. The edge regions receive less heating to avoid edge effect, while the center region receives more heating to compensate for heat loss. This local quality approach ensures temperature uniformity across the slab cross-section while maintaining rapid heating.
2Productivity
If induction heating is introduced to shorten production line length, then process efficiency is improved, but temperature field uniformity deteriorates due to multi-field coupling effects
Solution Approach 1:
Temperature sensors are installed at multiple positions (center and edges) of the slab to real-time monitor temperature distribution. The feedback signals are sent to the control system, which automatically adjusts the power supply to each heating zone to maintain uniform temperature field, thereby resolving the temperature uniformity problem while preserving the high productivity benefits of induction heating.
Solution Approach 2:
The system dynamically changes heating parameters (power, frequency, duration) based on real-time temperature feedback. By adjusting these parameters across different heating zones, the system achieves uniform temperature distribution while maintaining the rapid heating capability that enables high production efficiency.
3Manufacturing precision
If traditional hot rolling technology is used, then temperature field uniformity is maintained, but production line length increases and energy consumption rises
Solution Approach 1:
The patent replaces traditional mechanical heating systems (furnaces, burners) with electromagnetic induction heating. This substitution dramatically shortens the production line length by eliminating long heating zones while achieving comparable or better temperature uniformity through precise electronic control of multiple heating zones.
4Loss of time
If induction heating is used to rapidly heat intermediate slab, then production cycle is reduced, but skin effect and edge effect occur reducing product quality
Solution Approach 1:
The heating system applies different heating intensities to different regions of the slab. Edge regions receive reduced heating intensity to prevent edge effect, while the center receives higher intensity to achieve rapid heating. This local quality approach eliminates harmful skin and edge effects while maintaining the short production cycle advantage.
Solution Approach 2:
The induction heating system uses periodic alternating magnetic fields to generate eddy currents within the slab. By controlling the frequency and duty cycle of this periodic action, the system achieves rapid and uniform heating throughout the slab cross-section, preventing skin effect while maintaining short processing time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves precise temperature uniformity and consistency, improving the surface quality of the slab and enabling continuous production with reduced equipment investment, energy savings, and high-quality thin specification strip production.
Implementation Method 1
double-sided heating of the slab in the furnace is achieved by diffusing type burning of the double heat storage soaking furnace
Implementation Method 2
induction heating adopts an induction heating arrangement of bonding a transverse magnetic field as front half section and a longitudinal magnetic field as rear half section
Implementation Method 3
introduction of an induction heating technology, such that production line length is greatly shortened
Implementation Method 4
to a laminar cooling
Data Source
AI summary
The invention provides an endless rolling method based on temperature uniformity control, and belongs to the field of iron and steel metallurgy. By optimizing the process path, a new layout mode is adopted, a double heat storage soaking furnace and a descaling box are additionally arranged, transverse and longitudinal bonding magnetic induction heating device is adopted, transverse and longitudinal temperature uniform of the slab in the rolling process is realized, the cross section temperature difference is reduced, and the product quality is improved. On the basis of five-stand arrangement of a traditional finish rolling mill, a rolling mill is additionally arranged to serve as a standby rolling mill, such that on-line non-shutdown change roller of the finish rolling mill is realized. The method of the invention realizes a full-continuous production of production and meets the high-quality development requirements of iron and steel metallurgy, such that traditional cool rolling can be replaced with hot rolling, traditional thick-specification strip can be replaced with high-added-value thin specification strip. There is important significance in the aspects of productivity optimization layout, green manufacturing, intelligent manufacturing and the like.