Grain Oriented Steel Sheet Laser Domain Refining Juncture Control
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Solution Overview
Problem
Conventional methods for improving the iron loss property of grain-oriented electrical steel sheets through magnetic domain refining face challenges due to discontinuities caused by beam irradiation, leading to increased iron loss and reduced productivity.
Innovation Solution
The solution involves controlling the displacement between adjacent beam-irradiated regions on the steel sheet surface by setting specific ranges for the RD spacing and TD spacing at the juncture, ensuring that the nature of the juncture satisfies certain equations, thereby minimizing discontinuities and maintaining excellent iron loss properties while maintaining good productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple beam irradiation apparatuses are disposed in the widthwise direction to irradiate the full width of the steel sheet, then the full width coverage is improved, but discontinuities and displacements are caused at the juncture between beam-irradiated regions
Solution Approach 1:
The steel sheet width is divided into multiple irradiation zones, each covered by a separate beam irradiation apparatus. This segmentation allows each apparatus to focus on a specific region while maintaining overall full-width coverage, resolving the contradiction between area coverage and irradiation uniformity.
Solution Approach 2:
The patent optimizes parameters including beam spacing, scanning rate, and irradiation intensity to minimize discontinuities at junctures. By carefully controlling these parameters, the displacement between adjacent beam-irradiated regions is reduced, maintaining irradiation uniformity across the full sheet width.
2Productivity
If the scanning rate is increased to improve productivity, then the irradiation speed is improved, but the convergence restriction of beam limits the scanning rate
Solution Approach 1:
Multiple beam irradiation apparatuses operate in parallel, each scanning at optimized rates within their respective zones. This segmentation of the irradiation task allows the system to achieve high overall productivity while each individual beam maintains optimal convergence and scanning parameters.
Solution Approach 2:
Multiple beam systems are synchronized and coordinated to work together as a unified irradiation system. By merging the capabilities of multiple apparatuses with controlled synchronization, the system achieves high scanning rates and productivity while maintaining beam convergence quality.
3Loss of energy
If beam irradiation is performed to refine magnetic domains and reduce iron loss, then the iron loss property is improved, but discontinuities at junctures cause deterioration of iron loss property
Solution Approach 1:
The patent carefully controls irradiation parameters including beam intensity, scanning rate, and spacing to optimize magnetic domain refinement while minimizing discontinuities. By adjusting these parameters, the system achieves reduced iron loss while maintaining consistency across the entire sheet, preventing juncture-related deterioration.
Solution Approach 2:
The patent employs overlap irradiation at junctures between adjacent beam-irradiated regions. This beforehand cushioning approach ensures that transition zones receive adequate irradiation to prevent discontinuities, maintaining iron loss consistency across the entire sheet while achieving overall iron loss reduction.
4Area of stationary object
If the irradiated region is expanded to cover the full sheet width, then the treatment effectiveness is improved, but the displacement at juncture increases
Solution Approach 1:
The full sheet width is segmented into multiple irradiation zones, each with controlled boundaries. This segmentation allows precise control of irradiated area while managing juncture alignment through defined transition zones between segments.
Solution Approach 2:
Overlap irradiation is applied at junctures between adjacent beam-irradiated regions to compensate for potential misalignments. This beforehand cushioning ensures that even if displacement occurs, the critical transition zones receive sufficient irradiation to maintain treatment effectiveness and minimize alignment issues.
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 effectively suppresses the increase in iron loss by controlling the discontinuities within specified ranges, allowing for the production of grain-oriented electrical steel sheets with improved iron loss properties and enhanced productivity.
Implementation Method 1
JP S57-002252 B proposes a technique wherein a laser is irradiated to a final product sheet to introduce a high dislocation density region into a surface layer of the steel sheet
Implementation Method 2
JP H06-072266 B proposes a technique of controlling a magnetic domain width by electron beam irradiation
Data Source
AI summary
A magnetic domain refining treatment is performed by dividing a surface of a steel sheet into a plurality of regions in a widthwise direction, disposing a laser irradiation apparatus or an electron beam irradiation apparatus in each of the regions, and forming beam-irradiated regions through beam irradiation, wherein beams are irradiated so that a nature of a juncture between beam-irradiated regions satisfies 0≤α≤0.3×a and −1.2×a+0.02×w−0.5×α−6.5≤β≤−0.13×a−200×(1/w)+5.4 when TD spacing β at the juncture between the beam-irradiated regions is −3 to 0 mm, whereby a grain oriented electrical steel sheet having an excellent iron loss property is produced in a good productivity.