シュリーレン光学系によるプラスチックウェルダ用工具の振動姿態の観察 : 超音波プラスチックウェルダ用工具の振動解析(I)

概要

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In ultrasonic plastic welding, as is well-known, tools with about a half wavelength width or more and with proper slits are widely used for bonding wide plastic works. The vibrating surfaces of such tools vibrate uniformly like pistons. However the vibration mechanism has not been made clear yet. To make clear the vibration mechanism of the tool with slits, the radiation surfaces of the tools are kept in contact with the surface of the water and ultrasonic radiation patterns in the water, especially transient radiation patterns, are observed by a stroboscopic schlieren optics, where the tools are excited by periodical burst waves. It is proved by the observations that the tool with proper slits is a unity of the longitudinal unit vibrators with the same resonance frequency and that the shear forces between each unit vibrator make the radiation surface behave like a piston.
社団法人日本音響学会の論文
1984-11-01