Electroabrasive Mirror Finishing of the Inner Surfaces of Stainless Steel Pipes of Small Diameter.

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  • 小径ステンレス鋼管内面の電解砥粒鏡面仕上げ
  • ショウケイ ステンレス コウカンナイメン ノ デンカイ トリュウ キョウメン

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Abstract

Electroabrasive polishing is applied to the inner surfaces of SUS316L pipes of about 4 mm in diameter and 35 mm in length. The surface roughness of the drawn BA pipes is improved from about 3 μm Rmax before polishing to 0.05 μm Rmax. In the rough, intermediate and final stages of polishing, the tool electrode with #500 and #3000 nylon fabric sheets and a urethane sheet, respectivaly, was used, each with working times of 2 minutes at a current density of 0.20.3 A/ cm2. The surface roughness obtained through this process is one-tenth or less than that by the electropolishing process currently used for long stainless steel pipes of 4 meters in length. The tool electrode is not only rotated at 23 rps but also reciprocated at 7 Hz with an amplitude of 8 mm in order to obtain an abrasive grain crossing angle sufficient to avoid circular scratches. Characteristics of the electroabrasive polishing process are compared between machined pipes and drawn BA pipes. The removal rate for the former is approximately twice that of the latter at 0.3 A/cm2. The upper limit of current density for a mirror-finished surface is much higher in the former. These experimental findings can be attributed to the existence of the hardened surface layer formed by a bright annealing process. A trial electroabrasive polishing machine for long pipes 1 m in length is produced, and experiments are carried out to obtain useful data for putting the machine into practical use.

Journal

  • Shinku

    Shinku 40 (6), 523-528, 1997

    The Vacuum Society of Japan

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