High Precision Multiple Boring with Combining Ultrasonic Vibration Cutting and Superposition Superfinishing Process

概要

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The objective of this investigation is an invention of theory and technics on surface roughness≒0, roundness≒0, and cylindricity≒0 boring as small diameter and long length. In this paper it is analyzed that high precision boring can be achieved with combining the insensitive vibration cutting mechanism, microgroove selfcontrol mechanism on (40Hz30kHz) superposition superfinishing, the main spindle system with air bearing and the carriage system with the pneumatic floating system. These mechanisms which can reduce cutting resistance are especially effective for precision boring, because in this case the rigidity of the tool shank is very low. The concrete methods are as follows: In the first process, the work which is chucked on the main spindle with air bearing is machined as acting a continuously and systematically pulsating cutting force by the ultrasonic vibration cutting mechanism. In the following process, the work is finished by the newly developed (40Hz30kHz) superposition superfinishing device. After all, to actualize machining surface roughness of 0.10.5μmRz, roundness of 0.10.5μm, cylindricity of 00.5μm/60mm, is succeeded in work material of duralmin, brass, carbon steel, stainless steel, hardend steel (HRC39, HRC52) .It is found that the high precision boring can be realized by means of this new machining process and its lathe.