Abstract
This paper presents ultrasonic burnishing as a mechanical surface treatment for improving the quality of rotating shafts. Ultrasonic burnishing is a modern method for finishing workpieces to produce a good surface quality. This process improves the surface quality and increases the surface hardness of the workpiece, and the surface roughness of the workpiece improves. As a result, wear resistance and fatigue life increase. Furthermore, these improvements are achieved without expensive equipment or long processing times. In this paper the influence of the ultraburnishing technique on the change in diameter and its effects on the out-of-roundness of rotating shafts are investigated. This paper also takes a look at the magnitudes of the improvement of the surface roughness as a result of using ultrasonic burnishing. Three different materials, aluminium, 34-CrNiMo6 tempering steel, and S355J2 structural steel, are examined. The results showed that ultrasonic burnishing is a treatment that improves the quality of components. Ultrasonic burnishing also has a reducing effect on the final diameter and out-of-roundness and increases the hardness of the workpiece. It can also be stated that the material of the workpiece does not have a significant effect on the magnitude of the reduced surface roughness values.
Highlights
The ultrasonic method investigated in this paper is mainly used for finishing metal surfaces
Numerous studies have concluded that the surface roughness and the microstructure of the material are improved by the ultrasonic burnishing process [1, 12, 13]
The influence of ultrasonic burnishing for finishing rotating different material parts was investigated in the present work
Summary
The ultrasonic method investigated in this paper is mainly used for finishing metal surfaces. The method is based on forging at an ultrasonic frequency. The ultrasonic transducers convert high-frequency electrical power into ultrasonic vibration which leads to the finishing head of the ultrasonic tool to forge the surface of the material with the desired impact rate of up to over 20,000 impacts per second. The finishing head is hard metal and is placed at a right angle to the work piece. The finishing head is attached to a spring system which provides a constant contact force. The spring can be compressed to the desired extent, leading to higher contact forces as the deflection increases [1,2,3,4]
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