公开(公告)号：EP3192605A4

公开(公告)日：2017-10-04

申请号：EP15840509

申请日：2015-03-24

申请人： SAKAI THREADING TOOL CO LTD

发明人： HACHIUMA YOSHIO ,  YAMAGUCHI HITOSHI

IPC分类号： B23G5/06

CPC分类号： B23G5/06 ,  B23G5/20 ,  B23G2200/141 ,  B23G2200/146 ,  B23G2200/34

摘要： A cutting tap is provided which can form an internal thread with high accuracy even when a prepared hole for the internal thread has an inner periphery of which the dimensional accuracy is low. The cutting tap includes thread ridges (5), roots (8) formed between the respective axially adjacent pairs of thread ridges (5), and a plurality of deburring thread grooves (10) arranged at a constant pitch toward the axial front side of the cutting tap from the rearmost ones of the roots (8) in which the deburring thread grooves (10) are formed, and formed such that a groove bottom diameter (d 3 ) of the deburring thread grooves (10) gradually decreases toward the axial front side of the cutting tap. The respective deburring thread grooves (10) have groove bottom diameter (d 3 ) reliefs by which the groove bottom dimeter (d 3 ) gradually decreases from the front side toward the rear side of each deburring thread groove (10) in the rotation direction of the cutting tap, the groove bottom diameter (d 3 ) reliefs being set to be larger than effective diameter (d 1 ) reliefs of the thread grooves (5).

摘要翻译： 本发明提供一种即使在内螺纹的预备孔的尺寸精度低的内周部也能够高精度地形成内螺纹的切削丝锥。 切割丝锥包括螺纹脊（5），在相应的轴向相邻的一对螺纹脊（5）之间形成的根部（8），以及多个去毛刺螺纹槽（10），所述去毛刺螺纹槽以恒定间距朝向 切削丝锥从其中形成去毛刺螺纹槽（10）的根部（8）的最后面的切削丝锥形成，并且形成为使得去毛刺螺纹槽（10）的槽底直径（d 3）朝向轴向前端 切割丝锥的一侧。 各去毛刺用螺纹槽10具有槽底径（d3），该槽底径（d3）用于使槽底尺（d3）从各去毛刺用螺纹槽（10）的前侧朝向后侧沿旋转方向 切割丝锥，凹槽底部直径（d 3）浮雕设置为大于螺纹槽（5）的有效直径（d 1）浮雕。