Grain-oriented steel sheet asymmetric groove design
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Solution Overview
Problem
Grain-oriented electrical steel sheets face challenges in maximizing iron loss reduction while minimizing the decrease in magnetic flux density, particularly when grooves are formed on the surface, which can lead to fractures during bending and increased manufacturing costs due to complex processes.
Innovation Solution
A grain-oriented electrical steel sheet with grooves that have an average depth between 10 μm and 40 μm, an asymmetric cross-sectional shape, and specific angle conditions (0°≤θ1≤50°, θ1<θ2≤75°, θ2−θ1≥10°) to balance iron loss reduction and magnetic flux density preservation, along with a crystal grain size of 5 μm or greater and controlled surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If grooves are formed on the steel sheet surface to reduce anomalous eddy current loss, then iron loss is reduced, but magnetic flux density decreases and the steel sheet becomes prone to fracture during bending
Solution Approach 1:
The invention changes the geometric parameters of the groove, specifically setting the depth between 10-40 μm and controlling the cross-sectional shape with specific angle relationships (0°≤θ1≤50°, θ1<θ2≤75°, θ2−θ1≥10°). This optimized parameter range reduces the groove depth compared to conventional grooves, maintaining magnetic domain refinement effect while minimizing stress concentration and magnetic flux density loss, thereby improving bending resistance
Solution Approach 2:
The invention employs an asymmetric cross-sectional shape for the groove where the two side surfaces have different inclination angles (θ1≠θ2). This asymmetric design creates an optimized stress distribution pattern that reduces stress concentration at the groove roots, preventing fracture during bending while still achieving effective magnetic domain refinement. The asymmetry also helps maintain magnetic flux density by optimizing the groove geometry
2Loss of energy
If groove depth is increased to enhance magnetic domain refinement effect, then anomalous eddy current loss is reduced, but magnetic flux density decreases significantly
Solution Approach 1:
The invention optimizes the groove depth parameter to a specific range of 10-40 μm, which is shallower than conventional grooves. This controlled depth parameter achieves sufficient magnetic domain refinement to reduce anomalous eddy current loss while minimizing the removal of magnetic material, thereby preserving magnetic flux density. The parameter optimization finds the optimal balance point between these two competing requirements
3Manufacturing precision
If complex processes are used to form grooves with precise dimensions, then groove formation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces complex mechanical groove forming processes with laser irradiation technology. The laser method directly forms grooves with precise dimensions (depth 10-40 μm and controlled angles) through optical energy, eliminating the need for complex mechanical tooling and multiple processing steps. This substitution achieves high manufacturing precision while simplifying the manufacturing process and reducing costs
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
The solution effectively balances iron loss reduction and magnetic flux density minimization, enhancing bending resistance and rust resistance, while simplifying the manufacturing process by stabilizing groove formation and reducing manufacturing costs.
Implementation Method 1
a demagnetizing field effect due to a magnetic pole, which occurs in a groove side wall, is used
Implementation Method 2
a method of using a shock wave or rapid heating with laser irradiation
Implementation Method 3
rapid heating with laser irradiation
Implementation Method 4
a method of using a shock wave or rapid heating with laser irradiation
Data Source
AI summary
Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. An average depth D of the groove is greater than 10 μm and equal to or less than 40 μm in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center, a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction.