K-1028 Ultra smoothing bar and wire by drawing process with protrusion die

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  • K-1028 段付きダイスによる棒線の超平滑化引抜き加工(S14-2 表面改質材の特性(2))(S14 表面改質材の特性)

Abstract

Ultra-smoothing bar and wire are required for the use of precision machine parts. In order to achieve ultra-surface roughness, protrusion die drawing was developed and evaluated. The protrusion die induces high contact pressure and shearing strain at surface of drawn bar. By this technology, grinding and polishing process are eliminated and fatigue life is improved. As a results, surface roughness under maximum height of irregularities 1μ m was achieved by a new design die. There were optimum protrusion height to prevent seizures between die and drawn bar.

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