Title page for etd-0618116-105146


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URN etd-0618116-105146
Author Chih-hung Lee
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies of Electrochemical Abrasive Polishing on the Inner Surface of Hole of Die Steel Using Conductive Polymer Tool
Date of Defense 2016-07-25
Page Count 85
Keyword
  • Electrochemical abrasive polishing
  • Conductive polymer
  • Die steel
  • Abstract Abstract
    In this study, a conductive polymer (ESD 410C) was employed as a tool electrode to compositely electrolyze and abrasive polish the inner surface of workpiece made of SKD61 die steel using a polishing machine with multi-axis motions. The effects of tool electrode shape (cylindrical and square thread), alumina abrasive particle size (3, 1, and 0.3 μm), load (0.1 ~ 0.5 N), current (0 ~ 600 mA), and polishing time (0 ~ 10 min) on the inner surface roughness of workpiece were investigated.
    In the electrolytic polishing, the decreased rate of surface roughness Rmax was 0.05 μm/min under a current of 200 mA and a load of 0.3 N within 2 minutes using square thread tool electrode. The square thread is selected as the tool electrode in the following experiments because the decreased rate is better than that of cylindrical shape.
    In the abrasive polishing under a load of 0.3 N with a grit size of 1 μm in the electrolyte, the surface roughness Rmax and Ra decreased from 0.5 μm and 0.12 μm to 0.22 μm and 0.046 μm after 10 minutes, respectively. In the electrolytic polishing under a current of 200 mA and a load of 0.3 N, the surface roughness Rmax and Ra decreased to 0.35 μm and 0.069 μm after 10 minutes, respectively.
    In the composite electrolytic abrasive polishing without feeding, the two-stage process was conducted. In the first stage, the surface roughness Rmax and Ra decreased quickly to 0.18 μm and 0.042 μm under a load of 0.3 N, with a grit size of 1 μm in the electrolyte and a current of 200 mA after 4 minutes. In the second stage, Rmax and Ra decreased to 0.15 μm and 0.036 μm using a grit size of 0.3 μm after 6 minutes. The inner surface of the workpiece has achieved a bright mirror.
    In the composite electrolytic abrasive polishing with feeding, the inner surface roughness Rmax and Ra decreased quickly to 0.21 μm and 0.048 μm under a load of 0.3 N, with a grit size of 1 μm in the electrolyte and a current of 200 mA after 4 cycles or 32 minutes. The inner surface of the workpiece has also achieved a bright mirror.
    Keywords: Conductive polymer, Electrochemical abrasive polishing, Die steel
    Advisory Committee
  • Yuh-Ping Chang - chair
  • Li-Ming Chu - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0618116-105146.pdf
  • Indicate in-campus at 5 year and off-campus access at 99 year.
    Date of Submission 2016-09-08

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