Manufacturing method for compound screw and manufacturing program for compound screw

A compound screw manufacturing method of manufacturing a compound screw having a first thread groove and a second thread groove with a different lead angle and/or lead direction from the first thread groove, the compound screw manufacturing method comprising:

• a first thread groove forming step of forming at least a portion of a first thread groove by a first threading path obtained by feeding a threading tool that acts on a workpiece to be machined in a first feed direction practically parallel to a rotation axis, the workpiece rotating in a first direction about a predetermined axis as the rotation axis;
• and
• a second thread groove forming step of forming at least a portion of a second thread groove by a second threading path obtained by feeding the threading tool that acts on the workpiece in the first feed direction, the workpiece rotating in a reverse direction of the first direction.

A compound screw manufacturing method of manufacturing a compound screw having a first thread groove and a second thread groove with a different lead angle and/or lead direction from the first thread groove, the compound screw manufacturing method comprising:

• a first thread groove forming step of forming at least a portion of a first thread groove by a first threading path obtained by feeding a threading tool that acts on a workpiece to be machined in a first feed direction practically parallel to a rotation axis, the workpiece rotating in a first direction about a predetermined axis as the rotation axis;
• and
• a second thread groove forming step of forming at least a portion of a second thread groove by a second threading path obtained by feeding the threading tool that acts on the workpiece in a reverse direction of the first feed direction, the workpiece rotating in the same direction as the first direction.

A compound screw manufacturing program applied to a manufacturing apparatus for manufacturing a compound screw having a first thread groove and a second thread groove with a different lead angle and/or lead direction from the first thread groove, the compound screw manufacturing program configured to cause the manufacturing apparatus to perform:

• a first thread groove forming step of forming at least a portion of a first thread groove by a first threading path obtained by feeding a threading tool that acts on a workpiece to be machined a first feed amount in a feed direction practically parallel to a rotation axis, the workpiece rotating about a predetermined axis as the rotation axis, and
• a second thread groove forming step of forming at least a portion of a second thread groove by a second threading path obtained by feeding the threading tool that acts on the workpiece a second feed amount in the feed direction practically parallel to the rotation axis, the second feed amount differing from the first feed amount.

A compound screw manufacturing program applied to a manufacturing apparatus for manufacturing a compound screw having a first thread groove and a second thread groove with a different lead angle and/or lead direction from the first thread groove, the compound screw manufacturing program configured to cause the manufacturing apparatus to perform:

• a first thread groove forming step of forming at least a portion of a first thread groove by a first threading path obtained by feeding a threading tool that acts on a workpiece to be machined in a first feed direction practically parallel to a rotation axis, the workpiece rotating in a first direction about a predetermined axis as the rotation axis, and
• a second thread groove forming step of forming at least a portion of a second thread groove by a second threading path obtained by feeding the threading tool that acts on the workpiece in the first feed direction, the workpiece rotating in a reverse direction of the first direction.

A compound screw manufacturing program applied to a manufacturing apparatus for manufacturing a compound screw having a first thread groove and a second thread groove with a different lead angle and/or lead direction from the first thread groove, the compound screw manufacturing program configured to cause the manufacturing apparatus to perform:

• a first thread groove forming step of forming at least a portion of a first thread groove by a first threading path obtained by feeding a threading tool that acts on a workpiece to be machined in a first feed direction practically parallel to a rotation axis, the workpiece rotating in a first direction about a predetermined axis as the rotation axis, and
• a second thread groove forming step of forming at least a portion of a second thread groove by a second threading path obtained by feeding the threading tool that acts on the workpiece in a reverse direction of the first feed direction, the workpiece rotating in the same direction as the first direction.