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公开(公告)号：EP1595609B1
公开(公告)日：2008-01-09
申请号：EP04705922.5
申请日：2004-01-28
发明人： KURODA, Kouichi; c/o Sumitomo Metal Ind., Ltd. , OKUI, Tatsuya; c/o Sumitomo Metal Ind., Ltd. , HITOSHIO, Keisuke; c/o Sumitomo Metal Ind., Ltd.
摘要： A method of manufacturing a seamless steel tube for a drive shaft and a method of manufacturing the seamless steel tube, wherein a hollow member for the drive shaft having excellent fatigue strength and suitable for reducing the weight of a vehicle body can be manufactured by applying a facilitated inner surface cutting and the subsequent cold reduction to a steel tube hot-drawn by a Mannesmann tube manufacturing method to specify the recessed part depth (d), surface roughness (Ra), and recessed part inlet width (w) of recessed and protruded parts forming the inner surface of the steel tube or, in the same manner, to specify the recessed part depth (d), Vickers hardness (Hv) of the inner surface layer, and recessed part inlet width (w) of the recessed and protruded parts. Since the drive shaft for car can be efficiently manufactured at low production cost, the effect thereof can be industrially increased.
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公开(公告)号：EP1595609A1
公开(公告)日：2005-11-16
申请号：EP04705922.5
申请日：2004-01-28
发明人： KURODA, Kouichi; c/o Sumitomo Metal Ind., Ltd. , OKUI, Tatsuya; c/o Sumitomo Metal Ind., Ltd. , HITOSHIO, Keisuke; c/o Sumitomo Metal Ind., Ltd.
摘要： 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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