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As smartphones and tablets move toward thinner and lighter technologies, glass screens made with integrated touch sensors are becoming mainstream, while traditional touch sensors are embedded between liquid crystal panels and glass covers. Technology will slowly be replaced. This new type of cover glass has been treated with chemical strengthening technology and has become thin and strong.
For the production of the traditional touch screen glass cover sheet, the glass cover sheet of the desired size is first cut from the large glass plate by a grinding wheel, and then subjected to a chemical strengthening process, followed by printing on the panel, and finally implanting the sensor electrode. In order to improve production efficiency, manufacturers began to chemically strengthen the entire glass plate, and then carry out small block cutting, panel printing, electrode implantation and other processes. 
First, considering the safety of use, the glass cover sheet should be chamfered by glass after cutting. Conventional production processes are usually chemically strengthened after chamfering, resulting in a sturdy glass edge. Due to the low cost and widespread production of electroplated diamond wheels, such grinding wheels are commonly used in the production of touch screen glass covers. However, due to the thinner layer of diamond abrasive grains, the electroplated diamond wheel has a shorter service life and lower production efficiency. 
Second, the manufacturer found that if the glass cover sheet was first chemically strengthened, and then cut and chamfered, although the production efficiency was improved, there were also certain defects. The cut section is a completely new end face that is much less strong than the strengthened area of ​​the cover glass due to the inability to perform secondary chemical strengthening. In addition, due to the abrasive particles of the electroplated diamond wheel, many cracks are caused after the glass is cut, and the cracks on the side surface which are not subjected to secondary strengthening will gradually become cracks, thereby affecting the edge strength of the glass cover sheet. And the quality of use.
The chamfered glass cover sheet is finally polished by the polishing technique, but this step is only the last overall polishing of the ultra-thin surface layer; for angled, thicker edge edges, the polishing process is left over. Cracks and cracks are powerless. 
solution:
In response to the above problems, Japan TDTM Company has developed a metal bond grinding wheel, which can effectively complete the glass chamfering process and achieve better surface roughness. At the same time, it can completely avoid the occurrence of crack cracks in the cutting process. The edge strength of the machined glass cover sheet is three times that of the electroplated diamond wheel. In this way, in the process of chemical strengthening, post-cutting and chamfering, the metal bond grinding wheel can well solve the problem that the secondary surface of the cutting surface is hardened and the edge of the glass cover sheet is not strong. 
Metal bond grinding wheel for glass chamfering: 
Comparison of the experimental test of the chamfering of the electroplated diamond wheel and the metal bond grinding wheel: 
Four-point bending strength test comparison chart: 
Selection and application of grinding wheel in the production of smart phone touch panel
Abstract Background: With the development of smart phones and tablets towards thinner and lighter technologies, screen glass covers made by integrated touch sensors have become mainstream, while traditional touch sensors are embedded in LCD panels and glass covers. The technology between the pieces will be slowly replaced. And this...
background: ITO: indium tin oxide
problem: Abrasive grain size: #800 or #600