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Research Papers

Systematic Study of Ultrasonic Vibration Assisted Electron Beam Irradiation Process

[+] Author and Article Information
Z. G. Wang1

Department of Mechanical and Aeronautical Engineering, University of California, Davis, One Shields Avenue, Davis, CA 95616zgwang@ucdavis.edu

S. Kobayashi, I. Matsumoto

 Sodick Co. Ltd., 3-12-1 Nakamachidai, Tsuzuki-ku, Yokohama 224-8522, Japan

K. Yamazaki, X. Cheng, J.-P. Delplanque

Department of Mechanical and Aeronautical Engineering, University of California, Davis, One Shields Avenue, Davis, CA 95616

1

Corresponding author.

J. Manuf. Sci. Eng 131(4), 041006 (Jul 08, 2009) (8 pages) doi:10.1115/1.3159048 History: Received November 19, 2008; Revised May 05, 2009; Published July 08, 2009

Large area electron beams (EBs) have recently been successfully used to machine dies and tool steels. This large area EB process can greatly improve the machined surface quality as well as its corrosion resistance. However, some craters would still exist on the machined surface, which limits the further improvement of the surface quality of the machined workpieces. One possible solution is to apply external forces to workpieces by using high-frequency vibrations to smooth craters during melting and solidification in the EB process. In this study, a vibration system is designed to generate a high-frequency vibration with a certain amplitude by using sound wave’s transfer inside solids. Then, the performance of the designed vibration system is evaluated. Finally, the experiments of the vibration assisted EB process are carried out to verify the performance of assisted vibration in the EB process.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Diagram of the designed vibration system

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Figure 3

Design procedure and its optimization process

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Figure 4

Illustration of the vibration mode of the assembly vibration structure

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Figure 5

The designed vibration structure with applied boundary conditions

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Figure 6

Simulated displacement of vibration structure

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Figure 7

Assembled vibration structure after prototyping

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Figure 8

The captured plots of measured data with HP 3563A signal analyzer: (a) peak-peak output signal under input voltage of 25 V and (b) spectrum analysis of output signal from the vibrometer

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Figure 9

Surface profiles of Stavax test sample used in the experimental study

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Figure 10

Surface profiles of two test samples of Stavax after 15 irradiation shots: (a) surface profile for the test without vibration assistance and (b) surface profile for the test sample with vibration assistance

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Figure 11

SEM micrographs of Stavax workpiece surfaces: (a) before irradiation shots and (b) after 15 irradiation shots with assisted vibration

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Figure 12

Surface profiles of two test samples of SKD11 after 15 irradiation shots: (a) surface profile for the test without vibration assistance and (b) surface profile for the test sample with vibration assistance

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Figure 1

Oscillations in the longitudinal direction of wave propagation (λ is the wave length)

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Figure 13

Surface profiles of two test samples of SKD61 after 15 irradiation shots: (a) surface profile for the test without vibration assistance and (b) surface profile for the test sample with vibration assistance

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