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. 2018 Feb 27;9(3):98.
doi: 10.3390/mi9030098.

The Design of Rare-Earth Giant Magnetostrictive Ultrasonic Transducer and Experimental Study on Its Application of Ultrasonic Surface Strengthening

Shanxiang Fang  1 , Qinjian Zhang  2   3   4 , Huiling Zhao  5 , Jingzhou Yu  6 , Yongchen Chu  7
Affiliations

The Design of Rare-Earth Giant Magnetostrictive Ultrasonic Transducer and Experimental Study on Its Application of Ultrasonic Surface Strengthening

Shanxiang Fang et al. Micromachines (Basel). .

Abstract

Ultrasonic transducer based on rare-earth giant magnetostrictive materials was designed in accordance with the technical requirements of ultrasonic surface strengthening. The whole structure of the transducer was designed. Modal analysis is made to get the natural frequency of the compound oscillator. The working frequency of the transducer should be guaranteed at about 15.2 kHz and the composite oscillator should have relatively better vibration mode. The magnetic field of the transducer is well sealed and the transducer will not show obvious magnetic flux leakage phenomenon. Which shows the rationality of structural design. Based on this transducer, the ultrasonic surface strengthening experiment on 40 steel was conducted. The surface roughness and hardness of the parts were analyzed after the experiment. The results show that the surface of the parts reach the mirror surface result after the ultrasonic strengthening. When compared to the previous process, the roughness decreases by about 75%, and the surface hardness increases by more than 20%.

Keywords: hardness; rare-earth; roughness; ultrasonic surface strengthening; ultrasonic transducer.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The structure diagram of the transducer. (a) Structure diagram. 1-Sealing ring; 2-Case; 3-Permanent magnet; 4-Coil; 5-Bobbin; 6-Cooling water; 7-Sleeve; 8-Terfenol-D rod; 9-Magnetic sheets; 10-Disc spring; 11-Connectors; 12-Output rod; 13-Adjustment ring; 14-Inout port; 15-Balance weight; 16-Back cover; (b) The assembled transducer.
Figure 2
Figure 2
Terfenol-D rod after section treatment. (a) Terfenol-D rod; and, (b) Section treatment.
Figure 3
Figure 3
Simplified model of compound vibrator.
Figure 4
Figure 4
The modal diagrams in the range of 10 to 30 kHz. (a) model of compound vibrator; (b) The optimal vibratiom mode.
Figure 5
Figure 5
Finite Element Analysis of the Magnetic Field. (a) Transducer model; (b) Magnetic line of force distribution; (c) The magnetic flux density distribution; and, (d) The magnetic flux density distribution after expand.
Figure 6
Figure 6
Schematic diagram of the ultrasonic surface strengthening system. 1-Workpiece; 2-Processing head; 3-Tool holder; 4-Trasducer; 5-Ultrasonic power supply.
Figure 7
Figure 7
Appearance contrast before and after ultrasonic surface strengthening. (a) Appearance contrast before and after strengthening (20×); (b) Before strengthing (200×); (c) After strengthing (200×).
Figure 8
Figure 8
The variation tendency of surface roughness with different parameters. (a) Effect of the extrusion variable; (b) Effect of the feed rate; (c) Effect of the rotational speed.
Figure 9
Figure 9
The variation tendency of hardness with different parameters. (a) Effect of the extrusion variable; (b) Effect of the feed rate; (c) Effect of the rotational speed.
Figure 9
Figure 9
The variation tendency of hardness with different parameters. (a) Effect of the extrusion variable; (b) Effect of the feed rate; (c) Effect of the rotational speed.
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References

    1. Xiao X., Tong X., Gao G., Zhao R., Liu Y., Li Y. Estimation of peening effects of random and regular peening patterns. J. Mater. Process. Technol. 2018;254:13–24. doi: 10.1016/j.jmatprotec.2017.11.018. - DOI
    1. Altenberger I., Nalla R.K., Sano Y., Wagner L., Ritchie R.O. On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti–6Al–4V at elevated temperatures up to 550 °C. Int. J. Fatigue. 2012;44:292–302. doi: 10.1016/j.ijfatigue.2012.03.008. - DOI
    1. Fang S., Zhao H., Zhang Q. The application status and development trends of ultrasonic machining technology. J. Mech. Eng. 2017;53:22–32. doi: 10.3901/JME.2017.19.022. - DOI
    1. Clark A.E. Power Sonic and Ultrasonic Transducers Design. Springer; Berlin/Heidelberg, Germany: 1988. Magnetostrictive Rare Earth-Fe2 Compounds; pp. 43–99.
    1. Grunwald A., Olabi A.G. Design of a magnetostrictive (ms) actuator. Sens. Actuators A Phys. 2008;144:161–175. doi: 10.1016/j.sna.2007.12.034. - DOI

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