Ultrasonic machining device and ultrasonic cutting device

A female thread is provided at the tip of a rotating shaft (8) of an ultrasonic cutting device (1). On the other hand, a rod-shaped screw (6) with a hexagonal hole and a front block body (3) are made of integral metal. A piezoelectric element (3a) is placed in the rod-shaped screw (6) with a front block (3) which is integrally manufactured, a phosphor bronze plate which is not shown in the figure is placed, the piezoelectric element (3b) is placed, a hexagonal wrench is placed in a hexagonal hole of the rod-shaped screw (6) after the phosphor bronze plate is placed, and the wrench is put on a notch of a rear block (5) for fastening, so that the Langevin ultrasonic vibrator (2) with the rod-shaped screw (6) is manufactured. After a cutting tool (7) is inserted into the top end of the manufactured Langevin ultrasonic vibrator (2) with the rod-shaped screw (6), the cutting tool (7) is screwed into an inner threaded hole of a rotating shaft (8), and a wrench is lapped on a notch of a rear block body (5) for screw