| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
To manufacture small diameter steel pipes cheaply and simply, it was suggested that continuous shoe forming with saddle-curvature preforming. In order to form saddle-curvature surface, sheet metal warped longitudinally is required. Therefore, forming of the curved sheet by asymmetrical rolling was tried. Effects of rolling reduction of asymmetric rolling on warped curvature were investigated. The longitudinal curvature of formed sheet was periodically fluctuated with the increase in the rolling reduction. This phenomenon was explained based on the assumption that large plastic deformation which occurred at contact starting position with smaller roll propagates along slip line. When making straight the sheet which caused large longitudinal curve, a large curve occurs in width direction. This large curve in width direction is effective in continuous shoe forming.
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