公开(公告)号：EP1990552A1

公开(公告)日：2008-11-12

申请号：EP07707395.5

申请日：2007-01-25

申请人： Mitsubishi Heavy Industries, Ltd.

发明人： TEZUKA, Norikazu c/o TAKASAGO Machinery Works ,  HIROKAWA, Kazuharu c/o TAKASAGO Machinery Works ,  IHARA, Keisuke c/o TAKASAGO Machinery Works ,  OSAWA, Kei c/o TAKASAGO Machinery Works ,  ISHIKAWA, Hiroshi c/o TAKASAGO Machinery Works ,  TORIGOE, Taiji c/o TAKASAGO Machinery Works ,  YAMAMOTO, Ryuichi c/o TAKASAGO Machinery Works ,  HASHIMOTO, Yukihiro c/o TAKASAGO Machinery Works ,  IZUTSU, Nobuyuki c/o TAKASAGO Machinery Works ,  TAKAHASHI, Koji c/o TAKASAGO Machinery Works

IPC分类号： F16B33/06 ,  B23G9/00 ,  B24C1/10

CPC分类号： B24C1/10 ,  B23G9/001 ,  B23P9/04 ,  B23P15/00 ,  C21D9/0093 ,  F01D5/066 ,  F05D2230/311 ,  F05D2230/90 ,  F05D2260/941 ,  F05D2300/211 ,  F05D2300/2112 ,  F05D2300/2261 ,  F16B33/06 ,  Y10T29/479

摘要： The present invention provides a surface hardening portion 11 that has increased surface hardness and that is applied with a compressive residual stress, at least on the surface of a male screw 10 of a bolt 1. The present invention includes the steps of cutting to form the male screw 10 of the bolt 1, and processing to provide at least on the surface of the male screw 10 of the bolt 1 the surface hardening portion 11 that has increased hardness and that is applied with a compressive residual stress. As a result, the present invention can improve the fatigue resistance of the male screw 10 and the bolt is effective as a bolt to be used in a portion where the male screw 10 is subject to a repetitive stress.

摘要翻译： 本发明提供了至少在螺栓1的外螺纹10的表面上具有增加的表面硬度并施加压缩残余应力的表面硬化部分11.本发明包括以下步骤： 螺栓1的外螺纹10，并且至少在螺栓1的外螺纹10的表面上提供具有增加的硬度并施加压缩残余应力的表面硬化部11的加工。 结果，本发明能够提高外螺纹10的耐疲劳性，螺栓作为在外螺纹10受到重复应力的部分使用的螺栓是有效的。

公开(公告)号：EP1990552B1

公开(公告)日：2013-10-02

申请号：EP07707395.5

申请日：2007-01-25

申请人： Mitsubishi Heavy Industries, Ltd.

发明人： TEZUKA, Norikazu c/o TAKASAGO Machinery Works ,  HIROKAWA, Kazuharu c/o TAKASAGO Machinery Works ,  IHARA, Keisuke c/o TAKASAGO Machinery Works ,  OSAWA, Kei c/o TAKASAGO Machinery Works ,  ISHIKAWA, Hiroshi c/o TAKASAGO Machinery Works ,  TORIGOE, Taiji c/o TAKASAGO Machinery Works ,  YAMAMOTO, Ryuichi c/o TAKASAGO Machinery Works ,  HASHIMOTO, Yukihiro c/o TAKASAGO Machinery Works ,  IZUTSU, Nobuyuki c/o TAKASAGO Machinery Works ,  TAKAHASHI, Koji c/o TAKASAGO Machinery Works

IPC分类号： F16B33/06 ,  B23G9/00 ,  B24C1/10 ,  B64C1/10 ,  B23P9/04

CPC分类号： B24C1/10 ,  B23G9/001 ,  B23P9/04 ,  B23P15/00 ,  C21D9/0093 ,  F01D5/066 ,  F05D2230/311 ,  F05D2230/90 ,  F05D2260/941 ,  F05D2300/211 ,  F05D2300/2112 ,  F05D2300/2261 ,  F16B33/06 ,  Y10T29/479