Glass Sheet Cutting via Localized Heating and Edge Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional glass substrate cutting methods face issues such as surface property deterioration, increased complexity, and decreased productivity due to microcracks and meandering crack propagation, especially when using localized heating with inadequate support structures, which hinder accurate cutting and thermal efficiency.
Innovation Solution
The method involves supporting the glass sheet from the back surface with spaced-apart support members to minimize heat absorption and maintain a sufficient temperature gradient, allowing for precise full-body cutting along a preset line without moving the support members, thus enhancing thermal efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If support members are placed close to the cutting line to support the glass sheet, then the glass sheet is well-supported during cutting, but heat is absorbed by the support members reducing thermal efficiency
Solution Approach 1:
The support members are extracted from the cutting line area and positioned only at the edge portions of the glass sheet. This separation allows the heating unit to concentrate thermal energy on the cutting line without heat sink interference from support members, while the glass sheet remains stable on the support members at the edges.
2Productivity
If conventional scribing and snapping method is used, then the glass sheet can be cut, but microcracks are generated on the cut surface deteriorating surface quality
Solution Approach 1:
The mechanical scribing and snapping process is replaced with a thermal field-based cutting process. The heating unit creates localized thermal stress that propagates a clean crack through the glass sheet along the cutting line, eliminating the mechanical contact that causes microcracks and surface deterioration.
3Manufacturing precision
If multiple cutting steps are used as in conventional methods, then the glass sheet can be cut, but the process becomes complex and productivity decreases
Solution Approach 1:
Multiple cutting steps (scribing, cooling, snapping) are merged into a single continuous heating process. The heating unit moves along the cutting line and completes the entire cutting operation in one pass, eliminating the need for separate cooling and snapping steps while maintaining cutting accuracy.
4Productivity
If the glass sheet is continuously delivered for high-speed cutting, then productivity increases, but it becomes extremely difficult to perform accurate cutting
Solution Approach 1:
The system transitions from static cutting to dynamic cutting where the heating unit moves synchronously with the continuously delivered glass sheet. The support members remain stationary at the edges while the heating unit travels along the cutting line, maintaining precise thermal stress application despite the glass sheet's continuous motion.
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-speed, accurate cutting with improved surface quality and reduced complexity, allowing for continuous cutting of thin glass sheets and flexible handling, while avoiding heat wastage and microcrack formation.
Implementation Method 1
performing at least localized heating along a preset cutting line of the glass sheet
Implementation Method 2
a temperature distribution is formed by combining the heating through laser beam irradiation and the cooling through thermal conduction
Implementation Method 3
support members for supporting, from a back surface side of the glass sheet, portions of the glass sheet that are situated apart from the preset cutting line toward both sides thereof are arranged apart from each other so as to form a space on the back surface side of the preset cutting line
Implementation Method 4
a temperature distribution is formed by combining the heating through laser beam irradiation and the cooling through thermal conduction
Data Source
AI summary
Provided is a method of cutting a glass sheet (G) by performing at least localized heating along a preset cutting line (5) of the glass sheet (G), the method comprising cutting a full body of the glass sheet (G) by performing at least the localized heating along the preset cutting line (5) of the glass sheet (G) under a state in which support members (2 (8)) for supporting, from a back surface side of the glass sheet (G), portions of the glass sheet (G) that are situated apart from the preset cutting line (5) toward both sides thereof are arranged apart from each other so as to form a space (S) on the back surface side of the preset cutting line (8).