MANUFACTURING METHOD FOR COMPOUND SCREW AND MANUFACTURING PROGRAM FOR COMPOUND SCREW
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United States of America Patent
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Issued Date -
Nov 8, 2018
app pub date -
Nov 7, 2016
filing date -
Nov 7, 2016
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Abstract
Provided is a manufacturing method for a compound screw having a first thread groove and a second thread groove with a different lead angle or lead direction from the first thread groove, wherein at least a portion of the first thread groove is formed by feeding a threading tool that acts on a workpiece a first feed amount toward the workpiece, the workpiece being a rotating object to be machined. Additionally, at least a portion of the second thread groove is formed by feeding the threading tool that acts on the workpiece a second feed amount that differs from the first feed amount. With these steps, a compound thread portion is formed in the workpiece. As a result, it is possible to mass produce a compound screw having two thread structures of differing lead angles and/or lead directions with a high level of quality.
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