Glass Cutting Wheel Vertical Vibration for Crack Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LCD panel production, the formation of vertical cracks during scribing is often disrupted by microprojections on the glass surface or intersections with existing scribe lines, leading to unstable crack formation and potential glass edge chipping, which complicates the separation of glass into multiple parts.

Innovation Solution

Applying a force to oppose the rotation of the wheel, preventing it from riding on surface irregularities or existing scribe lines, ensures continuous and stable crack formation by maintaining a consistent force application during the scribing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wheel moves on the glass surface during scribing, then the linear score is formed, but the wheel may ride on microprojections or existing scribe lines causing discontinuous crack formation

Engineering Contradiction:

Improvestability of crack formationVSAvoidsurface irregularities and scribe line intersections

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The wheel is made to vibrate in the vertical direction (up and down) during the scribing process. This vibration prevents the wheel from getting stuck on or riding over microprojections and existing scribe lines on the glass surface, ensuring continuous and stable crack formation throughout the scribing process even when encountering surface irregularities.

Inventive Principle:

Principle #18Mechanical vibration

2Manufacturing precision

If the wheel applies force to cut the glass, then the fracture layer is formed, but vertical cracks may not form continuously at scribe line intersections

Engineering Contradiction:

Improvedepth and continuity of vertical crackVSAvoidcomplexity of scribing process

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The wheel vibrates vertically during scribing, which maintains continuous contact with the glass surface and ensures uninterrupted crack formation. This vibration mechanism allows the wheel to pass through intersections with existing scribe lines without losing crack formation continuity, achieving precise and deep vertical cracks throughout the entire scribing path.

Inventive Principle:

Principle #18Mechanical vibration

3Productivity

If the wheel rotates on the glass surface, then the scribing process progresses, but crack formation may be disrupted by surface irregularities

Engineering Contradiction:

Improveefficiency of glass separationVSAvoidcontinuity of crack formation

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The vertical vibration of the wheel during rotation ensures that the wheel maintains consistent contact with the glass surface even when encountering microprojections or existing scribe lines. This prevents disruptions in crack formation and ensures continuous, reliable crack propagation throughout the scribing process, thereby maintaining high productivity without sacrificing reliability.

Inventive Principle:

Principle #18Mechanical vibration

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 enhances the yield of the scribing and breaking process by ensuring continuous crack formation, even on non-flat surfaces or at scribe line intersections, thereby improving the stability and efficiency of glass separation into multiple panels.

Implementation Method 1

The wheel has a circumferential edge and is moved on a glass surface while applying a certain pressure to the glass surface. The wheel moves on the glass surface cutting into the glass by several micrometers thereby forming a linear score

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

At the same time as the linear score is formed, a crack with a depth vertical to the glass surface of several tens of micrometers to several hundred micrometers is formed immediately below the linear score. The formation of such a vertical crack propagates, as the wheel advances, ahead of the advancing wheel position with a front angle of several degrees

Methodology Applied

Scientific EffectStress concentration and crack propagation: Fracture Mechanics

Data Source

PatentUS9458048B2Glass cutting machine, glass cutter, and glass cutting method

Publication Date: 2016.10.04 MAGNOLIA PURPLE CORP

AI summary

A glass cutter is provided which can form, using a wheel, a uniform crack in glass even when a projection or an earlier-formed scribe line is present on the glass. When the wheel is moved on the glass, a fracture layer is formed causing a rib mark to be formed below the fracture layer and a crack to be formed below the rib mark. To cut the glass, the crack is required to be formed uniformly. Applying a force to resist the rotating force of the wheel makes it possible to form a uniform crack even when a projection is present on the glass. This improves glass cutting yield.