Cutting Chemically Toughened Glass via Stress Relaxation Paste
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chemically toughened glass is difficult to cut due to compressive stress, leading to low process efficiency and productivity in manufacturing various sizes and shapes, as existing methods either break the glass or are inefficient.
Innovation Solution
A method involving applying a paste with smaller alkali ions on the glass to be cut, heating it to relax compressive stress, and then cutting using a laser or scriber, which allows for precise cutting without breaking the glass by reversing ion exchange and reducing surface stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical toughening is performed to increase glass strength and hardness, then the glass becomes harder to cut and more prone to breaking, but the glass achieves the required mechanical properties
Solution Approach 1:
The patent applies a preliminary action by creating a tensile stress area on the glass surface before cutting. This is achieved by etching or mechanically treating the surface to introduce tensile stress that counteracts the compressive stress from chemical toughening, making the glass suitable for cutting while maintaining its overall strength
Solution Approach 2:
The patent changes the stress parameter on the glass surface by transforming the stress state from purely compressive (after chemical toughening) to a state with tensile stress components. This parameter change enables cutting operations to proceed without causing the glass to break, while the glass maintains its enhanced mechanical properties
2Adaptability or versatility
If chemical toughening is performed on thin glass sheets with complicated shapes, then the glass achieves desired physical properties, but secondary machining becomes substantially impossible
Solution Approach 1:
The patent performs preliminary stress modification by creating a tensile stress area on the glass surface before attempting secondary machining. This preliminary action prepares the glass to withstand the mechanical stresses of cutting or grinding operations while maintaining the complex shape and chemical toughening benefits
3Ease of manufacture
If conventional cutting methods are used on chemically toughened glass, then the cutting process is simple, but the glass breaks into irregular fragments instead of intended shapes
Solution Approach 1:
The patent changes the stress parameter on the glass surface by introducing tensile stress through etching or mechanical treatment. This parameter change allows conventional cutting methods to proceed simply while achieving precise cuts, as the modified stress state prevents the glass from breaking into irregular fragments
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
Enables efficient and reliable cutting of chemically toughened glass by removing compressive stress, improving productivity and preventing glass deformation or breakage during the cutting process.
Implementation Method 1
The chemical toughening method exchanges alkali ions having a small ion radius (generally Na ions) that are present inside a piece of glass with alkali ions having a large ion radius (generally K ions) under predetermined conditions. A great amount of compressive stress is created in the surface of the chemically toughened glass due to the ion exchange
Implementation Method 2
heating the paste; and cutting the chemically toughened glass along the portion on which the paste is applied
Data Source
AI summary
A method of cutting chemically toughened glass which is chemically toughened in a chemical toughening process of creating compressive stress in the surface of glass by exchanging first alkali ions in the glass with second alkali ions. The method includes the steps of applying a paste on a portion of the chemically toughened glass that is to be cut, heating the paste, and cutting the chemically toughened glass along the portion on which the paste is applied. The paste contains alkali ions. The ion radius of the alkali ions in the paste is smaller than an ion radius of the second alkali ions which substitute the first ions in the chemical toughening process.