Invention Application
US20050266927A1 Seamless steel tube for drive shaft and method for manufacturing the same
审中-公开
用于驱动轴的无缝钢管及其制造方法
- Patent Title: Seamless steel tube for drive shaft and method for manufacturing the same
- Patent Title (中): 用于驱动轴的无缝钢管及其制造方法
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Application No.: US11191909Application Date: 2005-07-29
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Publication No.: US20050266927A1Publication Date: 2005-12-01
- Inventor: Kouichi Kuroda , Tatsuya Okui , Keisuke Hitoshio
- Applicant: Kouichi Kuroda , Tatsuya Okui , Keisuke Hitoshio
- Priority: JP2003-024496 20030131
- Main IPC: B21B17/02
- IPC: B21B17/02 ; B21B17/14 ; B21B19/04 ; B21B23/00 ; B21B27/02 ; F16D3/16

Abstract:
A steel tube hot-finished by the Mannesmann tube-making method is subjected to a simple grinding process for the inner surface, and thereafter to a cold drawing, so that the depth d of the concave portion in the concavo-convex profile forming the inner surface of the steel tube, the surface roughness Ra and the width w of the entrance in the concave portion are specified, or similarly the depth d of the concave portion in the concavo-convex profile, the Vickers hardness Hv of the inner surface layer and the width w of the entrance in the concave portion are specified, hollow parts for a drive shaft, which have an excellent fatigue strength and which is optimal to reduce the weight of a car body, can be produced. Accordingly, the application of the manufacturing method according to the present invention allows drive shafts for automobiles to be efficiently produced in a reduced manufacturing cost, thereby providing a significant advantage in the industry.
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