Abstract
Chip breaking during a finish boring process has previously been a problematic procedure due to a lack of suitable automatic chip breaking methods. This paper presents the novel and automatic chip breaking method that utilizes a YAG laser together with an optical fiber. Preliminary experiments with sample model chips showed that a YAG laser of a CW oscillation mode could cut the model chips for wider ranges of width and thickness than that of a Q-switched mode. Succeeding experiments on an actual turning process revealed that a focused laser beam of more than 104 W/cm2 fully covering the positional fluctuation of generating chips could cut chips satisfactorily. These experimental results were used in the design of a new tool holder with a YAG laser machining optics for finish boring. The tool holder exhibited an excellent performance under the conditions: a machining speed of 60m/min, a depth of cut of 0.05-0.1mm and a feed rate of 0.08-0.2mm/rev. The laser power used was 150 W.
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