Laser Surface Processing With Fast Scanning to Suppress Oxide Film
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Solution Overview
Problem
Existing surface processing methods using laser irradiation for removing rust and old paint films on metal surfaces face challenges in suppressing the formation of oxide films while maintaining removal efficiency, often requiring multiple irradiation steps with different parameters, which complicates the process and reduces efficiency.
Innovation Solution
A surface processing method involving a continuous wave laser beam with a beam spot moving at 3 m/s or more and an irradiation time of 20 μs or less per point, combined with appropriate scanning patterns and fluence settings to minimize oxide film formation and enhance removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser irradiation is performed with high energy density to ensure removal performance, then rust and old paint film removal efficiency is improved, but oxide film formation is promoted and process speed is lowered
Solution Approach 1:
The patent applies periodic action by using pulsed laser irradiation instead of continuous irradiation. The laser beam is irradiated in pulses with specific duty cycles (1% to 50%), creating periodic heating and cooling cycles that prevent continuous oxide film formation while maintaining effective removal of rust and paint films during the pulse periods.
Solution Approach 2:
The patent changes multiple parameters simultaneously: irradiation time (20 μs or less per point), relative speed (3 m/s or more), and laser pulse characteristics (duty cycle 1%-50%). These parameter changes enable high removal efficiency while suppressing oxide film formation by reducing the total heat input and preventing sustained thermal conditions that promote oxidation.
2Object-affected harmful factors
If laser irradiation is performed with low energy density to suppress oxide film formation, then oxide film formation is reduced, but removal efficiency of rust and old paint film is impaired and process speed is lowered
Solution Approach 1:
The pulsed laser irradiation with duty cycles of 1% to 50% creates periodic high-energy bursts that effectively remove rust and paint films while the off-periods allow heat dissipation that suppresses oxide film formation. This periodic action enables low average energy density while maintaining high peak power for effective removal.
Solution Approach 2:
By changing the irradiation parameters to pulsed mode with specific duty cycles (1%-50%), the patent achieves both low average energy density (suppressing oxide formation) and high peak power (ensuring removal efficiency). The parameter change from continuous to pulsed irradiation resolves the contradiction between low energy density and high removal efficiency.
3Object-affected harmful factors
If multiple irradiation steps with different parameters are performed to suppress oxide film formation, then oxide film formation is reduced, but the number of irradiation times increases and the process becomes complicated
Solution Approach 1:
The patent merges the functions of multiple separate irradiation steps into a single pulsed laser irradiation process. By combining removal and oxide suppression functions into one process with optimized pulse parameters, the need for multiple sequential steps is eliminated, simplifying the overall process while achieving both removal efficiency and oxide film suppression.
Solution Approach 2:
The patent uses parameter changes within a single irradiation process (pulsed mode with duty cycles of 1%-50%, irradiation time ≤20 μs per point, speed ≥3 m/s) to achieve what previously required multiple steps. This single-step approach with optimized parameters simultaneously accomplishes removal and oxide suppression, reducing process complexity.
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 method effectively suppresses oxide film formation while ensuring high removal performance with a simplified process, improving the quality and efficiency of surface treatment for metal surfaces.
Implementation Method 1
a surface processing method for removing a surface of a processing object by moving a beam spot with respect to the processing surface, the beam spot being formed by condensing a continuous wave laser beam on an irradiation surface
Data Source
AI summary
A surface processing method is for removing a surface of a processing object by moving a laser beam spot with respect to the processing surface, where the beam spot is formed by condensing a continuous wave laser beam on an irradiation surface of the processing object. An irradiation time length is 20 μ-second or less when the beam spot passes through one point on the irradiation surface. A relative speed of the beam spot to the irradiation surface is 3 m/s or more.