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公开(公告)号：US10189065B2
公开(公告)日：2019-01-29
申请号：US15556368
申请日：2016-03-07
发明人： Hisakazu Tajika , Satoshi Igi
摘要： In a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. A method of manufacturing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process includes a step of forming the waveform shape such that a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively.
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公开(公告)号：US09205475B2
公开(公告)日：2015-12-08
申请号：US14389941
申请日：2013-04-02
发明人： Hisakazu Tajika , Takahiro Sakimoto , Satoshi Igi
CPC分类号： B21C37/16 , B21C37/08 , B21C37/0803 , B21C37/0815 , B21C37/30 , B21D3/14 , B21D5/015 , B23K11/0935 , B23K31/02 , B23K2101/06
摘要： A UOE steel pipe used to form a structure by performing butt circumferential welding and having an outside diameter shape in a waveform in a longitudinal direction is shaped to have no local minimum of the outside diameter shape in the waveform within a predetermined length from both longitudinal end portions.
摘要翻译： 用于通过进行对接圆周焊接并且具有沿纵向的波形的外径形状形成结构的UOE钢管被成形为在两个纵向端部的预定长度内的波形中没有局部最小的外径形状 部分。
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3.发明申请公开(公告)号：US20200080840A1
公开(公告)日：2020-03-12
申请号：US16469929
申请日：2017-12-01
发明人： Hisakazu Tajika , Satoshi Igi
摘要： A method of evaluating deformability of steel pipe with which deformability can be evaluated regardless of whether the pitch of pipe expansion is coarse or fine, and a method of manufacturing steel pipe using the method of evaluating deformability, are disclosed. A method of evaluating deformability of steel pipe according to the present invention is a method for evaluating deformability of a steel pipe manufactured through a pipe expanding step performed using a die. The method of evaluating deformability of steel pipe includes an outer shape acquiring step of measuring a shape of the steel pipe to acquire an outer shape, a power spectrum acquiring step of acquiring a power spectrum from a wavy shape of the acquired outer shape, and a determining step of integrating the acquired power spectrum for a predetermined wavelength range and determining deformability on the basis of the resulting integral.
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4.发明申请公开(公告)号：US20180104731A1
公开(公告)日：2018-04-19
申请号：US15556368
申请日：2016-03-07
发明人： Hisakazu Tajika , Satoshi Igi
CPC分类号： B21C37/16 , B21C37/0803 , B21C37/30 , B23K31/027 , B23K2101/06 , F16L9/006 , F16L9/02
摘要： In a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. A method of manufacturing a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process includes a step of forming the waveform shape such that a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively.
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