509 棒線における超平滑化引抜き加工の研究(OS 摩擦・摩耗材料)

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  • 509 Research on Ultra-Smooth Surface of Drawn Bar and Wire

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The inner surface roughness of tubes was improved by giving high contact pressure and large plastic strain. A new protrusive die on bearing portion is applied for the ultra-smooth outer surface of drawn bar and wire. This new die gives high pressure with large plastis strain ,and improves surface roughness in comparison with the normal die.

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