| 摘要 |
PURPOSE:To easily accomplish engagement with a very small gap or negative gap by applying continuous ultrasonic vibration to one or both of substances engaging with each other until they reach a certain depth of engagement, and then applying intermittent ultrasonic vibration to them to be engaged with each other. CONSTITUTION:An insertion pin 42 is installed on a cross head, and inserted and engaged therewith by pressing force produced by a lowering the pin 42 to a hole part 43. In this case, ultrasonic vibration is transmitted to the pin 42 at the forward end of a honing head, so that while vibration is transmitted to the hole part 43, insertion of the pin 42 is proceeded. The pin 42 is vibrated with a frequency composed of resonance frequency of an ultrasonic vibrator and natural frequency of a vibrated body. The vibrating pin 42 has the maximum amplitude at the forward end portion, frictional force is remarkably reduced at a contacting surface between the pin and a counterpart so that the contacting surface is smooth. On the other hand, vibration for repeatedly causing the pin 42 to the expanded and indented in the radial direction is also generated, so that the pin can be easily fitted therein with small insertion hole by temporary action of expanding a clearance in the engagement state. |
