Method of machining screw
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United States of America Patent
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Jan 8, 2019
Grant Date -
Feb 22, 2018
app pub date -
Jan 28, 2016
filing date -
Jan 28, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method of machining a screw is provided that is capable of preventing formation of a protruding section at a thread tip section. A thread is formed by cutting on a cylindrical body, and a surface of the thread is plastically deformed by rolling. Because of the cutting, a width between-side surfaces of a thread tip section is in a narrowed state as compared to a normal width. This width is narrowed toward a tip of the thread while a thread body section has a width expanded as compared to a normal width. Consequently, the side surfaces are formed to bulge by an excess thickness portion as compared to normal side surfaces. The rolling plastically deforms both side surfaces to cause the excess thickness portion to plastically flow toward the side surfaces.
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