The Effects of Lubrication on the Press Forming Limits of Sheet Metals
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概要
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The results of mathematical analyses or experiments of punch-stretching and deep drawing have been examined to obtain a systematic understanding of lubrication effects on the press forming limits of sheet metals. For this purpose, the relations of lubrication effects to size and shape effects in press forming have mainly been investigated. The limiting stretching depth depends strongly upon workhardenability of sheet metal, but the correlation between them is weakened by the presence of friction in the round-bottomed punch-stretching rather than in the flat-bottomed one. In non-axisymmetric punch-stretching, there is the accumulation effect which is caused by the combination of whole and local geometries of a pressed part and is also affected by lubrication. In deep drawing, the lubrication effect on the limiting drawing ratio is complicated and is generally stronger in non-axisymmetric drawing than in axisymmetric one.
- 一般社団法人日本機械学会の論文
著者
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Yoshida Kiyota
Institute Of Physical And Chemical Research
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MIYAUCHI Kunio
Institute of Physical and Chemical Research. Bunkyo-ku, Tokyo.
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KOMORIDA Hiroshi
Fuji Iron & Steel Company. Ltd.
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Miyauchi Kunio
Institute Of Physical And Chemical Research. Bunkyo-ku Tokyo.
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Komorida Hiroshi
Fuji Iron & Steel Company. Ltd.