Polyurethane Grinder for Display Panel Edge Repair
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Solution Overview
Problem
Existing methods for cutting display panels often result in horizontal or vertical cracks and surface flaws, which conventional grinding techniques can only partially address, leading to reduced panel strength due to increased surface roughness.
Innovation Solution
A grinder with a grinding unit comprising polyurethane, cerium oxide, and abrasives like zirconium oxide, silicon carbide, or aluminum oxide, operating at specific angles and speeds to efficiently repair cracks and smooth the edges of cut surfaces, thereby enhancing panel strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edges of cut surface are ground by a grinding stone with large grain size and high hardness, then cracks caused by cutting are eliminated, but surface roughness is increased leading to reduction in panel strength
Solution Approach 1:
The invention changes the grain size parameter of the abrasive from large (conventional) to fine (5μm to 20μm). This parameter change allows the abrasive to effectively eliminate cracks while producing a smoother surface with lower roughness, thereby maintaining panel strength. The fine grain size enables more precise material removal without creating large surface irregularities.
Solution Approach 2:
The invention uses a composite structure where an elastic material (natural rubber or synthetic rubber) is combined with ceramic abrasives (alumina or silica). This composite material provides both the elasticity needed to conform to the panel surface and the hardness needed to eliminate cracks, while the fine grain size of the ceramic particles ensures smooth surface finish and maintains panel strength.
2Productivity
If a cutting wheel is used to form a cut groove, then display panel can be separated from mother panel, but horizontal cracks or vertical cracks occur on edges of cut surface
Solution Approach 1:
The invention applies a preliminary grinding action after cutting to address the crack problem. By immediately grinding the cut edges with fine-grained abrasive, the cracks are eliminated before they can propagate or affect panel performance. This preliminary corrective action ensures high edge quality while maintaining the productivity benefits of wheel cutting.
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 described grinding method effectively eliminates or reduces cracks and surface roughness, improving the strength and yield of display panels by uniformly grinding the edges, thus addressing the limitations of previous techniques.
Implementation Method 1
a grinding unit including a grinding surface and a shaft connected to the grinding unit for rotating the grinding unit... bringing an edge of the panel to the grinding surface of the grinder to grind the edge
Data Source
AI summary
A grinder including a grinding unit including a grinding surface and a shaft connected to the grinding unit for rotating the grinding unit. The grinding unit includes polyurethane and a mixture of a repairer and an abrasive, and an angle α between a plane perpendicular to a rotational axis of the shaft and the grinding surface satisfies 1°≦α≦7°.