Glass Plate Scribing Method for Chip-Free Cutting
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Solution Overview
Problem
The existing scribing method for glass sheets, which involves forming auxiliary scribe lines perpendicular or inclined to the main scribe line, often results in damage during cutting due to interference with separated glass pieces and leads to defects like chips and splits at the outer peripheral contour.
Innovation Solution
A manufacturing method that includes forming a main scribe line with specific straight and curved connection portions, along with auxiliary scribe lines spaced apart from the main scribe line portions, to minimize contact and cutting interference, thereby reducing damage and defects during the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If auxiliary scribe lines are formed perpendicular or inclined to the main scribe line to divide the outer peripheral portion, then the interference between glass pieces during cutting is reduced, but the glass sheet is still liable to be damaged due to contact with separated glass pieces
Solution Approach 1:
The outer peripheral portion is divided into multiple glass pieces through auxiliary scribe lines, which prevents large-scale interference during cutting. This segmentation reduces the harmful interactions while maintaining structural integrity of the final glass sheet.
Solution Approach 2:
Instead of forming auxiliary scribe lines that intersect the main scribe line (which creates corner portions and potential damage points), the invention forms auxiliary scribe lines that are parallel to the main scribe line. This inverted approach eliminates the corner portions that cause damage while still achieving the goal of dividing the outer peripheral portion for easier removal.
2Ease of manufacture
If auxiliary scribe lines are formed perpendicular or inclined to the main scribe line, then the outer peripheral portion can be separated into multiple glass pieces, but chips and splits are formed at the outer peripheral contour of the glass sheet
Solution Approach 1:
The invention inverts the conventional approach by forming auxiliary scribe lines parallel to the main scribe line instead of perpendicular or inclined. This eliminates the formation of corner portions at intersections, thereby preventing chips and splits at the outer peripheral contour while still enabling easy separation of the outer peripheral portion.
Solution Approach 2:
The auxiliary scribe lines are positioned at specific locations (parallel to and spaced from the main scribe line) to achieve local separation of the outer peripheral portion without affecting the overall contour precision. This localized approach maintains manufacturing precision while facilitating ease of separation.
3Productivity
If the first glass piece is cut and separated while the outer peripheral portion is present in the vicinity, then the cutting process can proceed, but damage due to contact with the outer peripheral portion is more likely to occur
Solution Approach 1:
The outer peripheral portion is segmented into multiple smaller glass pieces through auxiliary scribe lines. This segmentation allows the first glass piece to be separated with minimal contact and interference from the outer peripheral portion, reducing damage risk while maintaining productive cutting process progression.
Solution Approach 2:
By forming auxiliary scribe lines parallel to the main scribe line rather than intersecting it, the invention eliminates corner portions that would otherwise cause damage during the separation of the first glass piece. This inverted approach protects the glass sheet while allowing the cutting process to proceed efficiently.
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 method effectively suppresses damage during separation and reduces the formation of chips and splits, ensuring a glass sheet with a precise outer peripheral contour conforming to the preset cutting line.
Implementation Method 1
a scribe wheel is caused to travel while being pressed against a surface of the glass original sheet
Implementation Method 2
A bending moment is caused to act on a periphery of the main scribe line to cut the glass original sheet
Implementation Method 3
A bending moment is caused to act on a periphery of the main scribe line to cut the glass original sheet along the main scribe line
Implementation Method 4
to cut the glass original sheet to obtain a glass sheet having an outer peripheral contour conforming to the preset cutting line
Data Source
AI summary
In a scribing operation, first through fourth auxiliary scribe lines are formed in a glass original sheet in addition to a main scribe line extending along a preset cutting line. A cutting operation includes a straight line portion cutting operation of cutting the glass original sheet along a first straight line portion of the main scribe line and the first and second auxiliary scribe lines, and cutting the glass original sheet along a second straight line portion of the main scribe line and the third and fourth auxiliary scribe lines, and a connection portion cutting operation of cutting the glass original sheet, which has been subjected to the straight line portion cutting operation, along a first connection portion of the main scribe line, and cutting the glass original sheet along a second connection portion of the main scribe line.