The Study of Vibration-Assisted Scribing Process in Circular Path Scribing of LCD Glass Substrate
Date Issued
2011
Date
2011
Author(s)
Pao, Ting-Kuang
Abstract
Wheel scribing is considered one of the most common glass substrate separation techniques nowadays. However, there is only a few applications referring to circular scribing paths, and currently, there is no relative studies in such functions. The primary subject of this study is to reach the quality similar to the ones acquired in linear paths, and the automatic separation mechanism with vibration assistant for both thinner and thicker glasses. In this study, the effects of scribing speed on different diameters were examined, and followed by how vibration assistant effects upon circular paths. The surface conditions after scribing were examined by observing the growth of radial crack, lateral crack and chippings on the sections of the glass substrate. For thicker glass substrate, circular path constant was proposed to identify the elastic component median crack depth changes; for thinner glass substrate, a custom bending test were introduced to identify the relative bending strengths under different vibration assistant amplitudes.
The results show that the radial and lateral cracks would tend to grow more drastically with higher scribing speed due to the forces caused by turning moment. Generally, reducing the scribing speed could reach better surface conditions. The path overlapping rate increases with smaller diameters, and the overlaid residual fields will invoke the adjunct flaws or faults, those were formed by previously scribing process, grow into cracks. This outcome is especially obvious in thinner glass substrates. Lowering the magnitude of vibration assistant amplitude to reduce the energy transmits into the glass can effectively suppress the induction of these undesirable cracks and channel the energy to the growth of median cracks. The median cracks will then be more regular, and the surface conditions will become better and the possibility of automatic separation will thusly increase.
Subjects
scribing wheel
breaking process
vibration assistant
circular path
automatic separation
Type
thesis
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