公开(公告)号：WO2019102927A1

公开(公告)日：2019-05-31

申请号：PCT/JP2018/042288

申请日：2018-11-15

Applicant: NETUREN CO., LTD.

Inventor： UEMOTO Toshifumi ,  ISHIKI Nobumoto ,  YAMAWAKI Takashi

IPC: B21J5/12 ,  B21C1/24 ,  B21K1/76 ,  B62D3/12 ,  F16H55/26

CPC classification number: B21K1/768 ,  B21C1/24 ,  B21J5/12 ,  B62D3/126 ,  F16H55/26

Abstract: A manufacturing method for a hollow rack bar made of a hollow shaft material and including a toothed section which has a rack on an outer surface and a shaft section which is formed thinner than the toothed section, the manufacturing method includes drawing the hollow shaft material by using a die and a plug, and preforming regions of the hollow shaft material including a toothed section forming region configured to form the toothed section and a shaft section forming region configured to form the shaft section to have thicknesses according to the regions respectively, and forming the rack at the toothed section forming region of the hollow shaft material which is preformed.