Title page for etd-0728115-162059


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URN etd-0728115-162059
Author Yi-chen Lin
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Fabrication of multi-axis motion type Electrochemical abrasive polishing machine and polishing experiments on inner surface of stainless steel
Date of Defense 2015-07-29
Page Count 91
Keyword
  • Conductive polymer
  • Electrochemical abrasive polishing
  • reciprocating motion
  • Abstract In this study, an electrochemical abrasive polishing machine with a multi-axis motion type was fabricated, where the tool electrode could move in the reciprocating, rotating and feeding directions and the work-piece rotated. A conductive polymer (ESD 410C) was employed as a tool electrode in this machine to polish the inner surface of work-piece made of stainless steel. Effects of particle size of alumina abrasive in the sodium nitrate electrolyte, polishing time, load and current on the inner surface roughness of work-piece were investigated.
    Experimental results showed that the surface roughness Rmax and Ra decreased from 0.5 μm and 0.12 μm to 0.24 μm and 0.066 μm without electricity under the load of 0.3 N with the grit size of 3 μm in electrolyte within 10 minutes. In electrolysis condition without using the abrasives, the surface roughness Rmax and Ra decreased to 0.35 μm and 0.083 μm, respectively under the current of 250 mA and the load of 0.3 N for 10 minutes. However, when the current was greater than 250 mA, the over dissociation occurred in the inner surface of work-piece, so that the surface roughness was greater than the original surface roughness.
    A two-stage process was conducted for a tool electrode without feed. In the first stage, the surface roughness Rmax and Ra decreased quickly to 0.245 μm and 0.059 μm under the load of 0.3 N, with the grit size of 3 μm and a current of 250 mA in electrolyte for 4 minutes. In the second stage, Rmax and Ra decreased to 0.14 μm and 0.034 μm using the grit size of 1 μm for 6 minutes. The inner surface of the work-piece has achieved bright mirror.
    Finally, the same two-stage process was conducted in the tool electrode feed. In the first stage, the surface roughness Rmax and Ra decreased quickly to 0.25 μm and 0.06 μm under the load of 0.3 N, with the grit size of 3 μm and a current of 250 mA in electrolyte for 2 cycles. In the second stage, Rmax and Ra decreased to 0.135 μm and 0.031 μm using the grit size of 1 μm for 3 cycles. The inner surface of the work-piece has also achieved bright mirror.
    Advisory Committee
  • Yeau-Ren Jeng - chair
  • Jen-Fin Lin - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0728115-162059.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-08-28

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