超音波スクリュー振動による加工法の研究(第2報) : 振動子傾斜角の影響

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In the screw vibration, vibration direction at the small end of the horn varies with the transducer inclination angle φ, in short, the ratio of torsional velocity component to vertical one changes. So, it is necessary to clear effects of φ. Vibration behavior, velocity and stress distribution were calculated and some exponential taper horns were made on the theory in the previous paper, and then effects of φ were examined by measuring the velocity or the displace-ment. In addition, glass drilling experiments were carried out by utilizing the base face of the small end of the horn, and usefulness of the ultrasonic drilling by screw vibration was examined. Following results are obtained : (1) As φ increases, the taper constant of the horn decreases, then the total length of the horn should be long. The vibration direction at the small end of the horn is equal to φ at the outside part of the horn, and gradually approaches to the vertical direction near the center of the horn. The suitable value of φ to generate perfect screw vibration is about 20-30°. (2) The machining rate shows the maximum value when the ratio of amplitude to mean diameter of abrasive grain is about 0.3,that is, the mean grain diameter is about 3-4 times amplitude. Suitable machining pressure in screw vibration is higher than that in longitudinal vibration, and surface roughness becomes somewhat finer. B_4C abrasive grain was recognized somewhat good effect on both machining rate and surface roughness.
公益社団法人精密工学会の論文
1985-11-05

超音波スクリュー振動による加工法の研究(第2報) : 振動子傾斜角の影響

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