Surface treatment technology using fine bubbles and ultrasound.

The Ultrasonic System Research Institute has released a technology that applies measurement, analysis, and control techniques related to the propagation state of ultrasound to alleviate the surface residual stress of ultrasonic transducers using an ultrasonic and microbubble generation liquid circulation system. This technology for alleviating surface residual stress enables improvements in fatigue strength against metal fatigue. In particular, by considering the guided waves (surface elastic waves) of the target object in the propagation state of ultrasound, we have developed a method to realize effective ultrasonic irradiation conditions through settings, tooling, and control. We have confirmed a wide range of effects on various types of metal parts, resin parts, and powder materials. Ultrasonic Probe: Overview Specifications - Measurement Range: 0.01 Hz to 200 MHz - Oscillation Range: 1.0 kHz to 25 MHz - Propagation Range: 0.5 kHz to over 900 MHz (analysis confirmation of sound pressure data) - Materials: Stainless steel, LCP resin, silicon, Teflon, glass, etc. - Oscillation Equipment: Example - Function Generator - Measurement Equipment: Example - Oscilloscope

The Ultrasonic System Research Institute utilizes a <degasification and microbubble generation liquid circulation system> to achieve effective ultrasonic control tailored to specific purposes. Explanation of Ultrasonic Liquid Circulation Technology 1) We use a dedicated ultrasonic tank (original manufacturing method). 2) The installation of the tank involves: 1: Using specialized materials. 2: Optimizing the natural vibration, ultrasonic frequency, and output. 3) The ultrasonic transducer is installed using specialized materials. (These materials can limit the utilization states of standing waves, cavitation, and acoustic flow.) 4) We use a degasification and microbubble generation device. (The standard dissolved oxygen concentration is 5-6 mg/l.) 5) The tank and ultrasonic transducer undergo surface modification. With the above settings and the diffusibility of microbubbles, a uniform cleaning liquid state is achieved. Ultrasonic waves propagate through the uniform liquid, generating a stable ultrasonic state. From this state, liquid circulation control is performed to realize the desired ultrasonic effects (propagation state). The operation control of the ultrasonic device, degasification device, liquid circulation pump, etc., is our expertise.

The Ultrasonic System Research Institute has developed a new component inspection technology using megahertz ultrasonic oscillation based on its track record of analyzing ultrasonic data propagating on the surface of objects. This method applies the measurement and analysis technology of "sound pressure and vibration" through the control of original ultrasonic probe oscillation. We provide consulting and explanations of ultrasonic evaluation technology through the development of ultrasonic probes tailored to the purpose (vibration modes propagating on the surface of objects). This is an application of new ultrasonic oscillation control technology. By utilizing nonlinear phenomena related to megahertz ultrasonic propagation states that match the acoustic characteristics of the target object, it is possible to detect new features regarding the surface condition of the object. In particular, this fundamental technology serves as a new evaluation parameter for ultrasonic vibrations, utilized in surface inspection of substrate components and pre-evaluation of precision cleaning parts, leveraging the response characteristics derived from combinations of oscillation and reception. By measuring, analyzing, and evaluating the dynamic characteristics of ultrasonic waves related to the propagation phenomena of surface elastic waves, we have enabled effective use tailored to the purpose (evaluation) through the construction and modification of logical models.

Technology for stably utilizing fine bubbles with a spherical size of 20μm or less—nano-level cleaning method that controls acoustic flow of ultrasound— 1-1. Basics of Ultrasound 1-2. Propagation Phenomena of Ultrasonic Vibration 1-3. Fine Bubbles (Microbubbles) *Properties of Microbubbles* 1) Bubbles of about 10μm rise slowly over approximately 3 hours to a height of 1m. 2) The generated bubbles exist independently without coalescing, resulting in excellent dispersion. 3) They have the property of slowly rising in water and adsorbing tiny debris to bring it to the surface. ... 13) The negative potential depends on the pH of the water. 14) Microbubbles have excellent scattering characteristics for ultrasound. 15) Microbubbles collapse as a resonance phenomenon when exposed to ultrasonic irradiation. These properties are expected to be further elucidated in the future, but currently contain many unknown aspects. Propagation Characteristics of Ultrasound 1) Detection of Vibration Modes (Changes in Self-Correlation) 2) Detection of Nonlinear Phenomena (Changes in Bicoherence) 3) Detection of Response Characteristics (Analysis of Impulse Response) 4) Detection of Interactions (Analysis of Power Contribution Rate)