3D Glass Laser Cutting With Vertical Defect Lines
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Solution Overview
Problem
The manufacturing of 3D glass parts poses challenges due to mechanical stress accumulation and the difficulty in cutting and separating curved shapes without inducing shattering or defects, with existing methods often requiring oversized substrates and post-processing finishing steps to achieve clean and strong edges.
Innovation Solution
A method using an ultra-short pulsed laser to create vertical defect lines in glass substrates, allowing for precise cutting and separation of 3D shapes with minimal debris and subsurface damage, enabling the production of 3D glass parts with negligible defects and preserved strength, without the need for post-process finishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mechanical cutting or scribing methods are used to cut 3D glass parts, then the cutting process is simple and fast, but the edges are populated with defects and micro-cracks that weaken the part strength
Solution Approach 1:
The patent replaces mechanical cutting systems (CNC machining, scribing tools) with a laser-based optical system. The laser beam creates defect lines through optical absorption and thermal stress, eliminating mechanical contact that causes edge defects and micro-cracks while maintaining high cutting speed.
Solution Approach 2:
The laser processing utilizes phase transitions of glass material through controlled heating and cooling cycles. The laser heats the glass to create thermal stress that generates clean defect lines, and subsequent cooling solidifies the structure without mechanical impact, preserving edge strength.
2Adaptability or versatility
If abrasive water jet or laser ablation is used to cut glass, then the cutting can be done on complex 3D shapes, but the process is too abrasive and leaves many defects and micro-cracks requiring post-processing
Solution Approach 1:
The patent changes the laser processing parameters (wavelength, pulse duration, power density) to optimize for clean defect line creation rather than ablation. By adjusting these parameters, the process achieves high adaptability for 3D shapes while minimizing harmful defects and micro-cracks.
Solution Approach 2:
The patent converts the typically harmful thermal effects of laser processing into a beneficial mechanism. The controlled thermal stress from laser heating is used to create clean, precise defect lines without the abrasive damage that would otherwise occur, eliminating the need for post-processing.
3Manufacturing precision
If oversized substrates are used to account for grinding and polishing steps, then the final edges can be finished to desired dimensions, but the manufacturing complexity and costs increase
Solution Approach 1:
The patent performs the cutting action with precise precision directly during the laser processing step, creating final-quality edges without requiring subsequent grinding or polishing operations. This preliminary precise action eliminates the need for additional manufacturing steps and oversized substrates.
Solution Approach 2:
The patent merges the cutting function and the finishing function into a single laser processing operation. The same laser beam that cuts the defect lines also creates the final edge quality, consolidating multiple manufacturing steps into one 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
The method enables controllable and precise cutting of 3D glass parts with negligible debris and low subsurface damage, preserving the strength of the parts and allowing for direct separation to final size, reducing manufacturing complexity and costs.
Implementation Method 1
The method uses an ultra-short pulsed laser to create vertical defect lines in glass substrates
Implementation Method 2
A method using an ultra-short pulsed laser to create vertical defect lines in glass substrates, allowing for precise cutting and separation
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A
AI summary
Methods are provided for laser processing arbitrary shapes of molded 3D thin transparent brittle parts from substrates with particular interest in substrates formed from strengthened or non-strengthened Corning Gorilla® glass (all codes). The developed laser methods can be tailored for manual separation of the parts from the panel or full laser separation by thermal stressing the desired profile. Methods can be used to form 3D surfaces with small radii of curvature. The method involves the utilization of an ultra-short pulse laser that may be optionally followed by a CO2 laser for fully automated separation.