Method for manufacturing metal fitting, method for manufacturing spark plug, and method for manufacturing sensor
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United States of America Patent
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Feb 13, 2018
Issued Date -
N/A
app pub date -
Jun 22, 2015
filing date -
Jun 27, 2014
priority date (Note) -
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Abstract
A method of manufacturing a metal fitting having a tool engagement portion engageable with a tool. The manufacturing method includes a cold forging process, wherein the cold forging process includes: a step (a) of forming a body portion having a first maximum length and a butt portion being continuous to the body portion and having a second maximum length larger than the first maximum length; and a step (b) of drawing at least a part of the butt portion in the axis direction, thereby forming the tool engagement portion.
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