Abstract
A concentric circular groove is on the both end surfaces of aluminum alloy column to retain lubricant. The columns are compressed by appling lubricant oozed from a groove and its barreling forms are measured. Effects of diameter and depth of concentric groove on the lubricating ability are studied in the compressibility of 10 to 40%. Effective geometric conditions of a groove are obtained from these experiments. Material flow patterns in the cross section of compressed columns with a concentric groove is shown in the comparison with a compressed column without a groove.
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