Thread forming tool use for forming female screw section in workpiece, has screw-shaped effective area provided with grooves tapering relative to axial direction of threaded piece and corresponding to guide rails

摘要

The thread forming tool includes a threaded piece (12) having a screw-shaped effective area (13). The screw-shaped effective area is provided with grooves (17b) tapering relative to the axial direction of the threaded piece and corresponding to the guide rails (16a,16b,16d).