| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw forming tool capable of reducing burrs produced on a mouth of a screw part and a metallic member with the screw part on it capable of easily fastening and positioning a fastening member as the burrs at the mouth are reduced. SOLUTION: This screw forming tool 10 has a prepared hole forming part 12 to drill a hole on a metallic plate W being a workpiece by rotation and pressurization and a screw forming part 16 to apply thread cutting in the hole 22 drilled by the prepared hole forming part 12. The prepared hole forming part 12 is furnished with a conical head end part 24 projected to a fore end and a burr-folding part 26 continuously provided on a base end side peripheral edge part of the conical fore end part 24 and curved and recessed toward the rear end side. COPYRIGHT: (C)2008,JPO&INPIT
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