材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
クロム板のロール圧縮曲げ
吉田 総仁岡田 達夫佐藤 寿明原田 泰典大森 正信
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46 巻 (1997) 8 号 p. 914-918

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The formability of sintered powder chromium plates of 99.8%-purity in roll-compression bending is investigated at various temperatures below the DBTT (Ductile-to-Brittle Transision Tempearture: 180°C for the chromium). In the roll-compression bending method for less-ductile chromium, roll-contact pressure is expected to prevent surface cracking, because high hydrostatic pressure increases ductility. However, on the first trial for monolithic chromium plates, a problem of this method was found from both the experiments and the FEM stress analysis that high tensile stress appears near the roll-contact region of the plate. To reduce the tensile stress there, steel-covered chromium plates were tested and were successfully bent at 80°C, whereas three-point bending was applicable only at the temperature above 130°C. It is thus confirmed that the roll-compression bending of steel-covered chromium plates is quite effective in decreasing the forming temperature.

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