Laser Magnetic Domain Refinement for Oriented Electrical Steel
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Solution Overview
Problem
Existing methods for refining magnetic domains in grain-oriented electrical steel plates are inefficient, as they either lose refinement after annealing, are environmentally harmful, or have stability and complexity issues, and there is a need for a method that optimizes equipment and processes to enhance magnetic domain refinement efficiency while preventing optical system damage and effectively removing pollutants.
Innovation Solution
A method and device that adjust the steel plate support roll position, irradiate a laser beam to form a groove on the steel plate while controlling radiant heat and tension, and maintain an optimal operation environment, including cooling and pollutant removal, to enhance magnetic domain refinement efficiency and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam is irradiated to form a melting groove on the steel plate surface, then magnetic domain refinement is achieved and iron loss is reduced, but radiant heat from reflection may damage the optical system
Solution Approach 1:
A reflective shield is introduced as an intermediary component between the laser irradiation zone and the optical system. The shield reflects radiant heat away from the optical system while allowing the laser beam to reach the steel plate, thus protecting the optical system without interfering with the magnetic domain refinement process
Solution Approach 2:
The harmful radiant heat is extracted and separated from the useful laser beam function. By positioning the reflective shield to intercept reflected radiant heat, the harmful thermal energy is removed from the optical path while the laser beam continues to perform its intended function of melting groove formation
2Productivity
If high speed processing is used for magnetic domain refinement, then productivity is improved, but stability and reliability of the refinement effect may deteriorate
Solution Approach 1:
The system employs dynamic control of laser parameters including power, scanning speed, and focal position to maintain stable magnetic domain refinement at high processing speeds. The laser oscillation frequency and amplitude are dynamically adjusted to ensure consistent groove formation and melting depth despite high-speed movement
Solution Approach 2:
A feedback control system monitors the laser beam irradiation process in real-time and adjusts processing parameters to maintain refinement stability. Sensors detect variations in melting groove characteristics and feed this information back to the laser control system, which automatically corrects parameters to ensure consistent magnetic domain refinement quality
3Manufacturing precision
If the laser beam irradiation parameters are increased to enhance refinement efficiency, then magnetic domain refinement is improved, but pollutants such as spatter and hill up increase
Solution Approach 1:
The laser oscillation parameters including frequency, amplitude, and waveform are optimized to achieve effective magnetic domain refinement while controlling pollutant generation. By carefully selecting laser power density, scanning speed, and oscillation characteristics, the process achieves high refinement efficiency with minimized spatter and hill up formation
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 method stabilizes magnetic domain refinement at high speeds, ensuring at least 5% improvement in iron loss before and 10% after heat treatment, prevents optical system damage, and effectively removes pollutants, enhancing the quality and efficiency of the magnetic domain refinement process.
Implementation Method 1
irradiating a laser beam to a surface of the steel plate to melt the steel plate and form a groove in the surface of the steel plate
Implementation Method 2
absorbing and removing radiant heat due to reflection of the laser beam irradiated to the surface of the steel plate... through a cooling block installed below an optical system... heat-exchanging and absorbing radiant heat of a laser beam
Data Source
AI summary
To optimize equipment and processes to enhance magnetic domain refinement efficiency and to enhance workability to improve processing capability, a method of refining a magnetic domain of a grain-oriented electrical steel plate includes zigzag controlling for transferring the steel plate without being inclined in right and left directions along a production line center, steel plate support roll position adjusting for controlling a position of the steel plate in up and down directions while supporting the steel plate, laser beam irradiating for irradiating a laser beam to a surface of the steel plate to melt the steel plate to form a groove in the surface of the steel plate, and removing for absorbing and removing radiant heat due to reflection of the laser beam irradiated to the surface of the steel plate during the laser beam irradiating.