Laser Scribing System
LASER SCRIBING SYSTEM FOR GRAIN ORIENTED ELECTRICAL STEEL APPLICATIONS
The Laser Scribing System have been developed with the aim to modify, opportunely, the state and size of the magnetic domains in grain oriented electrical steel (GOES) sheets through the use of laser sources, in order to increase the overall material efficiency by reducing its core losses.
This effect is obtained by irradiating a specific portion of the surface of the GOES sheet with a laser beam whose energy density and whose interaction time are carefully determined and controlled in order to:
ensure the reduction of the core losses due to hysteresis cycle, when the material is subject to the action of an oscillating magnetic field with sinusoidal 50 Hz and intensity of the order of Tesla
reduce the core losses due to eddy current
avoid any damage to the surface coating.
The result is a linear treatment across the width of the magnetic steel sheet and perpendicular to the orientation of the magnetic domains.
The spacing of adjacent parallel lines is also defined and controlled in order to obtain a good compromise between productivity and process result.
FIELDS OF APPLICATION
The Laser Scribing System is designed for special application on Grain Oriented Electrical Steel.
The Laser Scribing System can be integrated:
at the end of existing thermoflattering line (on-line system)
in a stand alone system with dedicated decoiling and coiling unit (off-line system – laser scribing complex)
LASER SCRIBING SYSTEM MAIN COMPONENTS
Supporting structures in welded steel beams for optical benches
Optical benches for beam treating, scanning and focussing.
Laser beam sources, complete of chillers
Magnetic working area for metal sheet during processing
CNC and Electro-instrumental components for the supervision of the system
Safety protection enclosure and control cabin
Fume aspiration and filtration units
LASER SCRIBING SYSTEM PARAMETERS
Deposition of the specific energy necessary to ensure the steel damage for domain refinement
Continuous and parallel lines, oriented perpendicularly to the GOES sheet transport direction, with width between 40 and 60 microns
Spot dimension along the scribing direction, automatically adjustable from 10 to 40 mm, according to optimal process parameters and current line speed. These features permit to avoid coating surface damage
Possibility of changing distance between consecutive lines from 4 to 10 mm automatically
LASER SCRIBING SYSTEM MAIN ADVANTAGES
Complete control of laser spot shape and size that ensure to work always with the correct value of Interaction Time and Energy Density to reach the optimum reduction of core losses
Absence of strip surface defect after laser treatment
Fast change of the optical system
Hot Redundancy on the laser source modules
The Laser Scribing System can be integrated with Coating Integrity Monitoring System for the inspection of the GOES strip surface after scribing treatment, with automatic regulation of scribing parameters.
In order to optimize in real time the performance of the laser scribing treatment, the laser scribing system can be integrated with on-line Core Loss Measurement System for the measurement of the GOES strip magnetic property before and after the scribing treatment with automatic regulation of scribing parameters
REMOTE TECHNICAL SERVICE
The Laser Scribing System CNC numerical control is appropriately configured and arranged for a remote technical assistance service.
This service enables assistance to be provided quickly and with the possibility of replacing damaged files, downloading customer files for carrying out analyses, sending updates, etc.
The Technical Service personnel is thus able to carry out an initial analysis of possible problems, also in the perspective of programming the type of intervention with the due precision.
LASER SCRIBING SYSTEM MAIN TECHNICAL SPECIFICATIONS
Strip width: up to 1200 mm
Strip thickness: starting from 0,10 mm
Scribing optical bench: no.2
Laser source: Fiber Laser
Laser Power: no. 2 x 5000 W (one for each optical bench)
Travel speed of GOES sheet: 100 m/min