Abstract
In the present study, by adding ultrasonic vibration in the longitudinal direction to assist the drill bit to drill on 0Cr17Ni4Cu4Nb stainless steel, in order to obtain high-quality deep small holes and prolong the service life of the drill bit. By establishing the movement mathematical model of the drill bit under ordinary drilling and longitudinal vibration drilling, the movement trajectory of the main cutting edge of the drill bit in two different drilling methods is compared and analyzed, and the anti-friction mechanism of longitudinal vibration drilling is analyzed. The conventional drilling and longitudinal ultrasonic drilling of 0Cr17Ni4Cu4Nb stainless steel are carried out on a longitudinal ultrasonic vibration drilling device. After drilling test, the wear morphology of the drill bit, the surface roughness of the hole wall and the chip morphology are observed and analyzed by the detection equipment. The result shows: the wear degree of the drill bit after longitudinal ultrasonic vibration drilling is lower than that of conventional drilling, which can prolong the service life of the drill bit. The surface roughness of the hole wall is reduced, and the drilling chips are more finely divided and easier to discharge.
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