抄録
Dry hobbing, which is a gear processing method wihout cutting oils, is useful for cutting cost and reducing environmental pollution. However, the dry hobbing has problems, for example, increase of the cutting temperature, cutting surface damage by the chips, and so on. This study produces a new gear processing method for dry hobbing. The method, "a vibration dry hobbing", gives axial micro vibration to a rotating hob. The vibration is provided by an oscillator. This paper explains the structure of the vibration hobbing machine which we developed, and shows the effectiveness of the machine by using experimental results. The vibration dry hobbing mehod was carried out for the HRC55 materials as finish machining under the following conditions : the cutting depth is 0.34 mm, the hob frequency is 1,034 Hz, the hob total amplitude is about 5μm, the cutting speed is 40.8m/min, the feed rate of hob is 1.0mm/rev and the hob module is 1.75. As the result, the black chips were changed into the white chips by the vibration. This result shows that the vibration dry hobbing method reduces the friction between hob and work, and decreases the processing temperature.
