Ultrasonic Vibration Power Research Articles

Influence of ultrasound on the basic parameters of the extrusion of polymer melts

The process of imposing ultrasound and its influence on the rheological properties of polymers, the high-elasticity properties of extrudates, the changes in the power of ultrasonic vibrations absorbed by a polymer in the course of extrusion, and also on the strength properties of extrudates are considered.

Effects of ultrasonic treatment on microstructure and mechanical properties of Mg-5Zn-2Er alloy

The effects of ultrasonic treatment on the microstructure and mechanical properties of Mg-5Zn-2Er alloy at room temperature (RT) and high temperature (HT) were investigated. The microstructure and mechanical properties of the samples were studied by OM, SEM and MTS material tester. The results show that the microstructure and mechanical properties are improved after the ultrasonic vibration. The best effects of ultrasonic vibration on microstructure and mechanical properties were obtained with the ultrasonic vibration power of 600 W and time of 100 s. The cavitation and acoustic streaming caused by ultrasonic treatment play a major role in refining the microstructure and increasing mechanical properties of the alloy.

Research on the Topography Feature of the Diamond Grinding Wheel under Elliptical Ultrasonic Assisted Dressing with Diamond Stylus

In this paper, topography feature of the diamond grinding wheel under the diamond stylus elliptical ultrasonic vibration assisted dressing was studied experimentally. The results indicate that: the increase in dressing power of elliptical ultrasonic vibration will result in the increase in amplitude, and that can increase abrasive protrusion height of the dressing grinding wheel, and also increase the depth of chip pocket. With the increase of feed rate, surface peak and valley values of elliptical ultrasonic vibration dressing grinding wheel increase, that is the average protrusion height of abrasive grain increases. With the increase of dressing depth, surface peak and valley values of elliptical ultrasonic vibration dressing grinding wheel increases, while the number of static effective abrasive grain reduces. In comparison with the ordinary dressing grinding wheel, elliptical ultrasonic assisted dressing in the same parameters can bring about more static effective abrasive grain , more uniform abrasive distribution, a higher abrasive protrusion height and more chip space.

Erosion Mechanism of Ultrasonic Vibration Abrasive Waterjet in Micro Machining

In this paper, a study on erosion mechanism of Ultrasonic Vibration Abrasive Waterjet is presented. Theoretical analysis of the total effective erosion kinetic energy of UVAWJ is performed. By using a UVAWJ machining system with an Ultrasonic Vibration Power Workbench, the comparative experiment is conducted. The erosion surfaces of the single crystal silicon substrate were measured by Optical Profiler and observed with Scanning Electron Microscope. The material removal mechanisms are discussed. It is concluded that the erosion by UVAWJ, with the aid of high-frequency ultrasonic vibration, can obtains a high material removal, less cracks and good finish surface.

Rotary ultrasonic machining of dental ceramics

Dental ceramics are used for a number of aesthetic and prostheses applications due to their high compressive strength, superior wear resistance and natural aesthetical appearance. However, their cost-effective machining still remains a challenge. This paper reports an experimental study on machining of one type of dental ceramics (macor) with rotary ultrasonic machining (RUM). Effects of process parameters (spindle speed, feed rate and ultrasonic vibration power) on the cutting force, surface roughness, and chipping size are obtained.

Effect of Ultrasonic Vibrations on the Growth of InxGa1-xSb Mixed Crystals (II)

In InxGa1-xSb mixed crystals grown by the ultrasonic-vibration-introduced Czochralski method, the facet growth was observed for the first time. The facets appeared under the influence of fairly larger output power of ultrasonic vibrations than the minimum power needed to grow single crystals of InxGa1-xSb. Both concentrations of the In matrix component and the Te impurity increased more in the facet growth region than in the normal growth one.

Effect of Ultrasonic Vibrations on the Growth of InxGa1-xSb Mixed Crystals

Effects of ultrasonic vibrations were investigated on InxGa1-xSb mixed crystals grown by the Czochralski method. During the growth, ultrasonic vibrations were introduced into the melt through the carbon crucible. InxGa1-xSb (0<x<0.07) was grown in the single crystalline state to a fair thickness with the introduction of ultrasonic vibrations, but no single crystals were obtained without vibrations. The growth thickness in the single crystalline state was increased with an increase of the output power of ultrasonic vibrations introduced.

Studies in the field of mechanochemistry — VI. A study of the disintegration of polystyrene in solutions under the influence of ultrasonic vibrations

A SUBSTANTIAL number of studies on the disintegration of polymers by ultrasonic vibrations are reported in the literature. Nonetheless it is extremely difficult to infer any general conclusions as to the mechanism and kinetics underlying the mechanochemistry associated with the changes which come about in high molecular compounds under the influence of ultrasonic vibrations, because the majority of the workers make no allowance for the power of ultrasonic vibrations under water and fail to pay sufficient attention to such important factors as the extent to which the energy of the vibrations is used up, the frequency of the vibrations, the concentration of the solution, the presence of acceptor radicals, etc. Furthermore, until recently the character of the processes that come into play when high intensity ultrasonic vibrations act on solutions had not been studied. At the same time a s tudy of disintegrating-combining processes occurring on exposure of polymer solutions over a wide range of ultrasonic vibration intensities would make it possible: (1) te deduce general characterizing criteria for the kinetics of ultrasonic disintegration, (2) to determine the mechanism of these processes, and (3) to evolve more rational methods of using ultrasonic vibrations for mechanochemical block-graft copolymerization. Although the at tempts of a number of authors [1-3] to approach the ultrasonic disintegration of polymers in terms of formal kinetics led to a specific mathematical interpretation, they threw no light on the mechanism underlying the process. The diversity of the factors that operate in the ultrasonic vibration disintegration of polymers in solution prompts the need to find a method of characterizing the process using constants of a more general nature which are not governed by the particular conditions under which the process is conducted. One of the key factors of the mechanochemical process is the energy yield (~), indicating the number of tools of product formed per unit of energy supplied.