Fluid-Jet Guided Laser Turning for Heat-Sensitive Materials
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Solution Overview
Problem
Conventional turning methods face challenges with hard, brittle, and heat-sensitive materials, limited to specific workpiece sizes, and often result in unsatisfactory surface roughness, making it difficult to integrate with other machining processes and efficiently machine high-aspect ratio workpieces.
Innovation Solution
A method and apparatus using a fluid-jet guided laser beam that allows for precise machining of various materials, including hard and brittle ones, by rotating the workpiece and moving the laser beam in different orientations, enabling full-automatic turning with improved surface quality and reduced tool consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional cutting tool is used for turning, then the workpiece can be machined by rotating and cutting, but hard materials like diamonds or superalloys cannot be easily turned due to tool limitations
Solution Approach 1:
The patent replaces the conventional mechanical cutting tool with a laser beam as the machining tool. The laser beam, being a non-contact energy source, can effectively machine hard materials like diamonds and superalloys that are difficult or impossible to machine with traditional mechanical cutting tools, thereby resolving the material compatibility limitation.
Solution Approach 2:
The patent changes the machining parameter from mechanical force to laser energy. By using laser beam parameters (power, pulse duration, wavelength) instead of mechanical cutting parameters (speed, feed, depth), the system can adapt to machine a wide variety of materials including hard, brittle, and heat-sensitive materials that cannot be processed by conventional mechanical means.
2Productivity
If a conventional cutting tool is used for turning, then the machining process can be performed, but heat-sensitive materials may be damaged by the heat produced during turning
Solution Approach 1:
The patent employs pulsed laser operation instead of continuous laser beam. By using periodic pulse sequences with controlled duty cycles, the laser delivers energy in short bursts followed by cooling intervals, allowing heat-sensitive materials to dissipate heat between pulses and avoid thermal damage while maintaining effective material removal.
Solution Approach 2:
The patent uses ultra-short pulse durations (nanosecond to picosecond range) to deliver the necessary machining energy in extremely brief intervals, rushing through the material removal process before significant heat can conduct into the workpiece, thereby minimizing heat-affected zones and preventing damage to heat-sensitive materials.
3Productivity
If conventional turning is used, then the workpiece can be machined, but the surface roughness of the machined surface is often not satisfactory and requires further processing
Solution Approach 1:
The patent utilizes controllable laser parameters including pulse duration, repetition rate, and power density to optimize the machining process. By adjusting these parameters, the system can achieve both efficient material removal and smooth surface finish in a single process, eliminating the need for separate polishing operations while maintaining high productivity.
4Adaptability or versatility
If conventional turning is used, then standard workpieces can be machined, but high aspect ratio workpieces and larger workpieces are difficult to machine
Solution Approach 1:
The patent replaces the mechanical cutting tool with a laser beam system that has no physical contact with the workpiece. This eliminates mechanical constraints such as tool access limitations and workpiece clamping requirements, enabling the machining of high aspect ratio workpieces and large-diameter workpieces that would be difficult or impossible to machine with conventional mechanical tools.
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
The fluid-jet guided laser beam method enables efficient machining of hard, brittle, and heat-sensitive materials with high precision and surface quality, reducing machining time and tool consumption, while allowing for integration with other processes and handling larger workpieces.
Implementation Method 1
providing a laser beam that is guided in a fluid jet by internal reflection
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The present disclosure relates to turning a workpiece with a laser beam coupled into a fluid jet, i.e., a fluid-jet guided laser beam. The disclosure respectively provides a method and an apparatus for machining a workpiece (30), wherein the machining comprises turning the workpiece. The method is carried out by the apparatus, which is configured to provide the fluid-jet (11) guided laser beam (12). The method comprises turning (21) the workpiece, wherein turning the workpiece (30) comprises: rotating the workpiece around an axis of rotation during the machining; and providing the fluid-jet guided laser beam to a machined surface of the workpiece.