Study of Internal Finishing of Austenitic Stainless Steel Capillary Tubes by Magnetic Abrasive Finishing

[+] Author and Article Information
Hitomi Yamaguchi1

Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan,hitomiy@cc.utsunomiya-u.ac.jp

Takeo Shinmura, Ryota Ikeda

Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan


Corresponding author.

J. Manuf. Sci. Eng 129(5), 885-892 (Dec 04, 2006) (8 pages) doi:10.1115/1.2738957 History: Received October 05, 2006; Revised December 04, 2006

This paper studies the internal finishing of capillary tubes using a magnetic abrasive finishing process. Such tubes are used with nanoscale technologies and meet the demands of the present age in medical and chemical equipment. The finishing characteristics are influenced by the magnetic abrasive behavior against the inner surface of the capillary, which is controlled by the supplied amount of magnetic abrasive and the magnetic force acting on it. The development of the finishing unit identifies the characteristics of the magnetic field, which controls the magnetic force, required for the necessary magnetic abrasive behavior. Finishing experiments using SUS304 austenitic stainless steel capillary tube with 800μm inner diameter demonstrate the effects of the supplied amount of the magnetic abrasive on the finishing characteristics, and the results suggest a standard method to determine the amount to achieve sufficient finishing. The run-out of the capillary while rotating at high speed under the cantilever tube support method causes instability of the magnetic abrasive behavior. The effects on the finishing characteristics are discussed, and a method to diminish the run-out is applied. Accordingly, this paper presents the conditions required for the internal finishing of capillary tubes and proposes methods to realize them. The internal finishing of 400μm inner diameter capillary tubes conveys an understanding of the mechanisms involved and demonstrates the usefulness of the proposed methods.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Schematic of processing principle

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Figure 2

Photograph of finishing equipment

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Figure 3

Magnetic field analysis by FEM

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Figure 4

Pole tip geometry and changes in magnetic flux density and gradient with distance y

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Figure 5

Changes in surface roughness and material removal with finishing time

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Figure 6

SEM micrographs of unfinished surface and surfaces finished with 150μm mean diameter iron particles

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Figure 7

Changes in surface roughness with supplied amount of mixed-type magnetic abrasive

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Figure 8

Changes in surface roughness with distance X

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Figure 9

Three-dimensional surface shapes measured by optical profiler

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Figure 10

Jig for three-point support system

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Figure 11

Changes in surface roughness with distance X

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Figure 12

Three-dimensional surface shapes measured by optical profiler




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