| 主权项 |
1. A manufacturing method of an ultrasonic generating device, the method comprising:
attaching an attachment unit to a bar portion from a second axial direction side in a bolt-shaped member, the attachment unit including a piezoelectric element configured to convert a current to an ultrasonic vibration, a head portion forming a first end of the bolt-shaped member on a first axial direction side, the first axial direction being a direction parallel to a longitudinal axis, the bar portion smaller in an outside diameter than the head portion forming a second end of the bolt-shaped member on the second axial direction side, the second axial direction being opposite to the first axial direction; fixing, as a fixed end, the second end of the bolt-shaped member to which the attachment unit is attached, by using a bolt fixing portion of a jig, while the bolt-shaped member is expandable by a movement of the first end which is a free end toward the first axial direction; applying a compressive force to the attachment unit toward the first axial direction by a force applying unit while the second end of the bolt-shaped member is fixed, and thereby generating a first elastic force in the attachment unit; and attaching a fastening member to the bar portion of the bolt-shaped member in a balanced condition in which a second elastic force of the bolt-shaped member and the first elastic force of the attachment unit are in balance, and fastening the attachment unit between the fastening member and the head portion of the bolt-shaped member to maintain the balanced condition. |
