Waterjet-Guided Laser Optics for Ceramic Depth-of-Cut Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Machining ceramic components in gas turbine engines, such as cooling holes and slots, is challenging due to the extreme hardness and brittleness of ceramic materials, requiring more precise and efficient processes for feature creation.
Innovation Solution
A waterjet-guided laser machine with inline optical feedback control, utilizing a pulsed laser beam and a light-emitting diode, where the light beam optical path is coincident with the laser optical path within the nozzle, allowing for adaptive adjustment of the cutting process based on depth-of-cut feedback from a light sensor, and additional acoustic feedback for precise process monitoring and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional machining processes are used on ceramic components, then material removal is possible, but machining precision deteriorates due to extreme hardness and brittleness
Solution Approach 1:
The patent replaces traditional mechanical machining systems with a laser-based thermal processing system. The laser beam delivers concentrated thermal energy to melt and vaporize ceramic material, bypassing the limitations of mechanical cutting tools that struggle with extreme hardness and brittleness. This substitution enables precise machining of cooling holes and slots in ceramic turbine components without tool wear or mechanical stress damage.
Solution Approach 2:
The patent employs real-time monitoring and dynamic adjustment of laser processing parameters including power, pulse duration, scan speed, and focal position. By continuously adjusting these parameters based on process feedback, the system maintains optimal machining conditions for different ceramic materials and feature geometries, achieving high precision while accommodating material variability.
2Productivity
If higher laser power is used to increase cutting speed, then productivity improves, but thermal load on the workpiece increases causing deviations from desired tolerances
Solution Approach 1:
The patent employs pulsed laser operation instead of continuous beam delivery. By delivering energy in controlled pulses with specific duty cycles and frequencies, the system achieves high material removal rates during the ON phase while allowing heat dissipation during the OFF phase. This periodic action prevents excessive thermal accumulation that would otherwise cause warping, cracking, or dimensional deviations in the ceramic workpiece.
Solution Approach 2:
The patent incorporates real-time optical feedback monitoring that detects changes in reflected or emitted light from the machining zone. This feedback is used to dynamically adjust laser power and scan parameters to maintain optimal cutting conditions, ensuring both high productivity and precision by preventing thermal overload while maximizing material removal efficiency.
3Manufacturing precision
If continuous monitoring is implemented to improve process control, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent uses the existing laser beam delivery optics and waterjet guidance system to also serve as the monitoring pathway. The same optical components that guide and focus the laser beam are used to collect process feedback signals, eliminating the need for separate monitoring hardware. This multi-functional approach reduces system complexity while maintaining high measurement precision for real-time control.
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 enhances precision, reduces thermal load, and widens the process window for machining ceramic components, enabling higher efficiency and accuracy in forming features like cooling holes and slots with reduced deviations from desired tolerances.
Implementation Method 1
A waterjet-guided laser machine may be used to machine features, such as cooling holes and slots, into the ceramic components
Implementation Method 2
A light beam optical return path along which a portion of the light beam that is reflected off of a workpiece travels from the nozzle outlet and back through the nozzle to the light sensor
Implementation Method 3
A waterjet head including an inlet for receiving water and a nozzle having an outlet for a discharging a jet of the water therefrom
Data Source
AI summary
A waterjet-guided laser machine includes a laser source, an LED, a waterjet head, and a light sensor. The waterjet head includes a water inlet and a nozzle having an outlet for a discharging a waterjet. There is a laser optical path along which a pulsed laser beam travels to the nozzle outlet. There is also a light beam optical delivery path along which the light beam travels from the LED to the nozzle outlet. The light beam optical delivery path is coincident with the laser optical path in the nozzle. There is a light beam optical return path along which the light beam that is reflected off of a workpiece travels to the light sensor. The light beam optical return path is coincident with the laser optical path inside the nozzle and coincident with the light beam optical delivery path inside the nozzle.