Laser Shock Peening Hidden Surface Control
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Solution Overview
Problem
Current laser shock peening methods are ineffective for processing hidden surfaces with curved geometries or large apertures, as they struggle to maintain uniform shock wave reflection, leading to compromised processing quality.
Innovation Solution
A method and device that control the shifting and rotation of a total reflecting mirror using a signal collecting system to ensure the reflected laser beam hits the hidden surface at an appropriate incident angle (0°–30°), allowing for segmental processing and continuous laser shock peening across the entire surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reflected shock wave processing method is used for hole walls, then laser shock peening can be applied to hidden surfaces, but the method is not applicable when the hidden surface is a curved surface or the aperture size is large due to difficulty in producing appropriate reflecting cone and shock wave diffusion
Solution Approach 1:
The patent divides the curved hidden surface into multiple small planar segments. By treating each segment as a separate processing zone with its own optimal incident angle, the system can maintain uniform shock wave reflection across the entire curved surface. The control system calculates and adjusts the reflecting mirror angles for each segment independently, ensuring consistent processing quality regardless of surface curvature or aperture size.
2Ease of operation
If fixed angle laser processing is used, then processing parameters are simple to control, but the incident angle cannot be adjusted for different regions of curved hidden surfaces
Solution Approach 1:
The patent employs a dynamic control system that automatically adjusts the reflecting mirror angles based on the specific geometry of the hidden surface being processed. The control system calculates the optimal incident angle for each processing position and dynamically repositions the mirrors in real-time. This dynamic adaptation maintains processing simplicity for the operator while achieving versatility for different surface geometries through automated angle adjustment.
3Manufacturing precision
If laser beam is introduced at inappropriate incident angle, then processing setup is simplified, but the shock wave reflection becomes non-uniform and processing quality deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the system continuously monitors the actual incident angle of the laser beam on the hidden surface and compares it with the optimal angle. Based on this feedback, the control system automatically adjusts the reflecting mirror positions to maintain the correct incident angle. This feedback loop ensures uniform shock wave reflection while managing device complexity through automated control algorithms.
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 expands the application of laser shock peening to complex surfaces, ensures uniformity and improves processing quality by maintaining a controlled incident angle, making it suitable for workpieces with curved or large aperture hidden surfaces.
Implementation Method 1
LSP utilizes the mechanical effect of shock wave induced by strong laser to process the material
Implementation Method 2
The residual compressive stress layer formed by LSP can effectively eliminate stress concentration in the material
Implementation Method 3
controlling the shifting and rotation of a total reflecting mirror in a workpiece by means of a control system
Data Source
AI summary
A method and device for strengthening the laser shock of a hidden surface includes establishing a continuous laser shock strengthening track and process after acquiring the information about the whole hidden surface. A control system adjusts the movement and rotation of a total reflection mirror which is arranged in a workpiece according to the signal from signal collecting cards for making a reflected laser beam act on a region to be machined of the hidden surface at an appropriate incidence angle. The method can realize the surface strengthening treatment of the hidden surface of the workpiece, significantly improve the mechanical performance of the workpiece and increase the fatigue life thereof, which is applicable to the surface strengthening of the workpiece with the hidden surface.