公开(公告)号：EP1428597A4

公开(公告)日：2008-05-14

申请号：EP02741209

申请日：2002-06-20

申请人： NISSEI CO LTD

发明人： SHINBUTSU TOSHINAKA ,  YOSHIZAWA MINORU ,  AMANO SHUICHI ,  ITO KENJI

IPC分类号： B21H5/00 ,  F16H55/22 ,  B21H3/04

CPC分类号： B21H5/005 ,  F16H55/22 ,  Y10T29/49471

摘要： A method of forming a worm gear by rolling to reduce the number of working processes while sufficiently assuring a gear accuracy, comprising the step of positioning a work material between a first rolling die (100) and a second rolling die (101) by the rotation of the rolling dies and a servo−motor (76) for feeding the work material, wherein the lead angle of the worm gear varies to produce a step during form rolling when the lead angle is large enough to produce a large difference between a finished diameter and a material diameter, a slide table (55) is slid freely on a feed table (53) and detected by a detection sensor when the step occurs by the lead angle of the first rolling die (100), second rolling die (101), and the work since the slide plate (55) is allowed to slid freely on the feed table (53), the rotations of the first rolling die (100) and the second rolling die (101) are stopped, the reverse movement of the slide plate (55) is also started to start the rolling simultaneously when the first rolling die (100) and the second rolling die (101) are started to rotate reversely and the same steps are repeated for rolling.