Wear and Adhesion Behavior of SUS304 Stainless Steel Foil<br>in Progressive Dry Micro-Deep Drawing

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  • 清水 徹英
    首都大学東京大学院理工学研究科機械工学専攻
  • 村重 雄志郎
    首都大学東京大学院工学研究科機械工学専攻　院生
  • 真鍋 健一
    首都大学東京大学院理工学研究科機械工学専攻

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  • 連続マイクロドライ円筒深絞り加工における<br>SUS304ステンレス鋼箔材の摩耗•凝着挙動
  • レンゾク マイクロドライ エントウ フカシボリ カコウ ニ オケル SUS304 ステンレス コウ ハクザイ ノ マモウ ギョウチャク キョドウ

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Abstract

Scaled progressive dry deep-drawing test is conducted up to 300 times on the micro- and milli-scales, in which cups of 0.97 and 5.82mm diameters are produced with stainless steel foils of 0.05 and 0.3mm thicknesses, respectively. The experimental results show that the transition of maximum punch force in the repetition test has a different tendency for each scale and corresponds to the transition in the surface state of the tools and drawn cups. Although the strong adhesive wear is observed on the milliscale, there is little change in the surface state of tools and drawn cups on microscale. To investigate the wear behavior of work material on each scale, finite element analysis considering surface asperities is conducted. The distribution of wear volume at the die corner radius is evaluated with a semiempirical function of normal pressure and relative velocity between the blank and the die. The results show the low wear volume in the microscale process, due to the short sliding distance during the process. The progressive wear phenomena and the advantage of tool life in microforming are demonstrated.

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