Laser Drilling Stage Control to Prevent Hollow Cavity Wall Damage
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Solution Overview
Problem
Laser processing of hollow cavities faces challenges with over-ablation and poor processing quality due to the inability to accurately control the drilling process, especially in narrow cavities, where existing methods either rely on indirect process monitoring or filling materials that may not effectively prevent damage.
Innovation Solution
A method and system combining process monitoring and control in laser drilling, which involves collecting signal evolution and motion track information, constructing prediction and identification models to determine drilling stages, and adjusting processing parameters to implement specific drilling strategies, ensuring accurate control and prevention of wall damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser processing is performed on hollow cavities without process control, then processing speed is maintained, but over-ablation occurs and processing quality deteriorates
Solution Approach 1:
The patent implements real-time feedback control by monitoring plasma radiation signals during laser drilling and using this information to dynamically adjust processing parameters. The system continuously detects drilling state through signal acquisition and processing, then feeds this information back to control the laser processing, preventing over-ablation while maintaining high processing speed.
Solution Approach 2:
The system enables the processing system to monitor and control itself automatically. By integrating signal acquisition, processing state judgment, and parameter adjustment within a single automated control loop, the system performs self-monitoring and self-regulation without external intervention, ensuring consistent processing quality throughout the drilling operation.
2Manufacturing precision
If process monitoring is implemented to prevent over-ablation, then processing quality is improved, but the link between monitoring signal and processing control is indirect and control accuracy is reduced
Solution Approach 1:
The patent uses plasma radiation signals as an intermediary between the drilling process and control system. These signals directly reflect the drilling state and are processed through a dedicated signal processing module that extracts meaningful information, creating a direct and accurate link between process monitoring and control decisions.
Solution Approach 2:
The system dynamically changes processing parameters based on real-time drilling state detection. By adjusting laser power, drilling speed, and other parameters according to the detected drilling stage, the system achieves precise control with high accuracy, directly linking monitoring information to control actions through parameter optimization.
3Object-affected harmful factors
If materials are filled in the cavity to prevent over-ablation, then wall damage is reduced, but the protection state cannot be fed back and control is lost
Solution Approach 1:
The patent replaces the mechanical approach of filling cavities with protective materials with an optical-field-based monitoring and control system. By using plasma radiation detection and real-time parameter adjustment, the system prevents wall damage through intelligent control rather than physical barriers, maintaining full visibility and feedback capability throughout the process.
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 enables high-efficiency, high-accuracy, and wall-damage-free laser drilling by accurately identifying drilling stages and adjusting the laser processing parameters, enhancing the controllability and quality of the process.
Implementation Method 1
Laser processing has various characteristics such as high processing accuracy, high processing quality, ability to process almost any material, and contactless processing
Implementation Method 2
due to its contactless processing and Gaussian light transmission characteristics, a processing depth cannot be controlled by axial feed
Implementation Method 3
light transmission of a laser processing process is prone to the interference of structural evolution, plasma eruption and other phenomena of the processing process
Data Source
AI summary
The present disclosure provides a protective method and system combining process monitoring and control in laser drilling. This method includes collecting signal evolution information, a current hole depth, and motion track information in a laser drilling process; performing a feature extraction on the signal to obtain sequential eigenvalues evolving over time, and constructing a prediction model of the penetration time based on the eigenvalues; combining the hole depth and motion track information with the eigenvalues to construct a drilling stage identification model; combining a prediction result of the prediction model of penetration time and identification confidence of the identification model at different moments to construct a state identification model; and judging a current drilling stage according to the model, controlling the processing process according to a judgment result, and using different drilling strategies at different drilling stages. High-efficiency, high-accuracy, and wall-damage-free processing can be ensured.