Ihi Corporation

Nobuhiko Yunoki

Mitsutoshi Watanabe

Hiroyuki Ochiai

Hiroki Yoshizawa

Yukihiro Shimoda

Masanobu Hasegawa

Satoshi Kurita

Kyouhei Nomura

Hifumi Tabata

Eiji Hosoi

A seal structure includes: first and second members defining a hollow internal area of a fluid device; and a seal member fixed to the first member for sealing a gap between the first and second members. The seal member includes a sliding contact member being in sliding contact with a surface of the second member and formed of a resin. The second member includes a resin layer and a resin layer holding structure. The resin layer is formed by sliding the second member on the sliding contact member to transfer the resin forming the sliding contact member onto a sliding contact portion of the surface of the second member at which the second member comes into contact with the sliding contact member. The resin layer holding structure is a porous film formed by electric discharge surface treatment and holds the resin layer in the sliding contact portion.

Seal structure of fluid device

A discharge surface treatment electrode used in discharge surface treatment for forming a wear-resistant film on a treatment target surface of a workpiece by use of the discharge energy of electric discharges caused between the electrode and the workpiece, the film being made of a material of an electrode or a substance obtained by a reaction of the material of the electrode with the discharge energy. The discharge surface treatment electrode is formed by: compression-molding a mixed powder into a green compact, the mixed powder being formed from a powder of a Stellite alloy with an average particle size of 3 &#x3bc;m or less prepared by use of a jet mill and a powder of a metal with an average particle size of 3 &#x3bc;m or less manufactured through an atomization process or a chemical process; and subjecting the green compact to heat treatment.

Discharge surface treatment electrode and method of manufacturing the same

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Tokyo, Japan

Nobuhiko Yunoki