THROUGH-HOLE DRILLING OF SODA-LIME GLASS PLATE USING ELECTROPLATED DIAMOND TOOL

摘要

This paper investigated tool geometries and drilling conditions to minimize crack size when drilling soda-lime glass plate with a thickness of 2.8mm using electroplated diamond tool. The obtained results are as follows. The chip removal in the through-hole drilling is necessary in order to minimize crack size. In step drilling, the tool with chip pockets and bowl end is effective. In helical drilling, the tool with a space in drilling is effective. In each drilling method, the crack size increases with the drilling numbers. The thrust force rises owing to the adhered chip at the tool end. The small crack size is required to control the adhesive of chip. Therefore, the washing of tool is required in order to restrain crack. It can maintain the crack size of less than 0.1mm by removing chip adhered on the tool surface.