Grinding device, grinding method, and method of manufacturing glass sheet

Abstract

A grinding device for grinding an object to be ground in such a manner that a grinding tool and the object to be ground are moved while being pressed to each other and the object to be ground is ground by the grinding tool while a grinding liquid is supplied to between the grinding tool and the object to be ground. The grinding device is provided with: an AE sensor mounted to a plate supporting the grinding tool or the object to be ground; an abnormality detecting section for detecting an abnormality during grinding, the detection being performed on the basis of an output signal from the AE sensor outputted when an elastic wave from the object to be ground is detected by the AE sensor; and an alarm means for issuing an alarm when an abnormality of the object to be ground is detected by the abnormality detecting section.

Description

technical field [0001] The present invention relates to a polishing device, a polishing method, and a method for manufacturing a glass plate that detect abnormalities such as cracks that occur in a glass plate during processing, such as a crack. Background technique [0002] In the glass plate manufacturing process, glass plates are subjected to various processes such as cutting, chamfering, drilling, grinding, thermoforming, and air-cooling strengthening. For example, a glass plate used for a flat panel display (FPD) such as an LCD or an OLED has micro unevenness or curvature on the surface that mainly affects an image, and a part or the entire surface of the glass plate is polished by a polishing device. [0003] In order to perform such grinding|polishing, there is known the grinding|polishing apparatus provided with the moving grinding head which holds and conveys a glass plate, and the some grinding|polishing table arrange|positioned under this grinding head. According...

AI Technical Summary

Problems solved by technology

[0004] However, during the grinding of the glass plate by the grinding device, the glass plate occasionally breaks

In this case, when the grinding process is continued with the broken glass plate, the grinding pad will be damaged by the broken glass plate.

Then, in the production process, when a plurality of glass plates are sequentially ground and continuous grinding is performed, there is a disadvantage that a subsequent glass plate is adversely affected.

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