METHOD AND APPARATUS FOR SHAFT DIAMETER ENLARGEMENT
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United States of America Patent
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Issued Date -
Jun 25, 2020
app pub date -
Sep 7, 2018
filing date -
Sep 8, 2017
priority date (Note) -
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Abstract
To radially enlarge an intermediate portion of a shaft, the shaft is held by a pair of holders with a gap between the pair of holders in an axial direction of the shaft, compression force is applied in the axial direction to the intermediate portion arranged between the pair of holders, and alternating load is applied in a direction intersecting the axial direction to the intermediate portion to enlarge the intermediate portion. When enlarging the intermediate portion, a temperature of the intermediate portion is set to be above a blue brittleness temperature range of the shaft, and a temperature of the holders is set to be below a tempering temperature range of the holders.
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