Inductive Steel Strip Heating With Transverse and Longitudinal Fields
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Solution Overview
Problem
Existing hot rolling mills face inefficiencies in heating steel strips of varying thicknesses due to limited flexibility in heating devices, which results in inadequate heating for both thin and thick strips, leading to poor temperature profiles and reduced productivity.
Innovation Solution
A hot rolling mill with a heating device comprising a combination of transverse and longitudinal field modules, along with a power supply that allows adjustable frequency and current intensity, enabling efficient heating of steel strips across a wide thickness range by optimizing the magnetic field orientation and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the heating device is adapted for heating thin steel strips with a specific operating frequency, then the temperature profile for thin strips is improved, but thick steel strips cannot be heated adequately
Solution Approach 1:
The heating device employs dynamic adjustment of operating frequency based on the thickness of the steel strip. The control unit automatically selects appropriate frequency ranges (e.g., 200-1500 Hz for thin strips, lower frequencies for thick strips) to optimize heating effectiveness across the full thickness range of 6-65 mm, resolving the contradiction between specialized optimization and general adaptability
Solution Approach 2:
The invention changes the operating parameter (frequency) of the inductive heating device according to the workpiece thickness. By adjusting frequency within specific ranges for different thickness categories, the device achieves both precise temperature control for thin strips and adequate penetration for thick strips, simultaneously improving manufacturing precision and adaptability
2Adaptability or versatility
If the operating frequency of the inductive heating device is changed significantly, then the heating effectiveness for different thickness ranges is improved, but the device requires lengthy modification
Solution Approach 1:
The heating device incorporates a dynamic frequency adjustment capability through a control unit that can switch between different frequency ranges without physical modification. This allows the device to adapt to different steel strip thicknesses (6-65 mm) by electronically adjusting the operating frequency, eliminating the need for lengthy mechanical modifications while maintaining heating effectiveness
Solution Approach 2:
The inductive heating device is designed with universal applicability across a wide thickness range through programmable frequency control. The single device can handle multiple thickness categories by changing operating parameters rather than requiring different hardware configurations, achieving multi-functionality without increasing manufacturing complexity
3Device complexity
If a single heating concept is used for all steel strip thicknesses, then the device structure is simplified, but the temperature profile becomes non-homogeneous across different thicknesses
Solution Approach 1:
Instead of using different heating concepts for different thicknesses, the invention maintains a unified heating device structure while changing the operating frequency parameter to achieve homogeneous temperature profiles. The control unit adjusts frequency based on thickness, ensuring uniform heating across the full range of 6-65 mm without complicating the device structure
Solution Approach 2:
The heating device achieves universal performance across all thickness ranges through parameter adjustment rather than structural complexity. A single inductive heating system with programmable frequency control can effectively heat both thin (6-15 mm) and thick (15-65 mm) strips with homogeneous temperature distribution, simplifying the overall device architecture
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 solution achieves homogeneous temperature profiles across the width and thickness of steel strips, improving heating efficiency and expanding the product range, with potential energy savings of up to 50% and enhanced productivity.
Implementation Method 1
the heating device in the steel strip generates a magnetic field transversely or longitudinally to the transport direction of the steel strip with a specific operating frequency
Implementation Method 2
heating device for inductive heating of a flat steel strip
Data Source
Figure 1~4
Figure 5a~5b
Figure 6a~6b
AI summary
The invention relates to a heating device (1) and a method for inductively heating a flat steel strip (2) in a hot rolling mill, wherein the heating device (1) is arranged between two rolling mills of the hot rolling mill and the flat steel strip (2) passes through the heating device (1) in a transport direction (R) at a speed, wherein the heating device (1) comprises: - a plurality of transverse field modules (3) arranged one after the other along the transport direction (R) of the flat steel strip (2), and - a plurality of longitudinal field modules (4) arranged one after the other along the transport direction (R) of the flat steel strip (2), which are arranged along the transport direction (R) before or after the transverse field modules (3).