Patents by Inventor Toshio Ohnishi
Toshio Ohnishi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20060218985Abstract: There are provided a high dimensional accuracy pipe and a manufacturing method thereof, the pipe being in response to wide requirements of sizes, being manufactured at inexpensive cost, and having a sufficient fatigue strength. The detailed structure thereof is as follows. A push-to-pass process is performed in which, while a plug 1 is being charged in a metal pipe 5, the metal pipe is pushed in a hole provided in a die 2 and is then allowed to pass therethrough. As a result, a high dimensional accuracy pipe can be obtained in which at least one of the deviation of the outer diameter, the deviation of the inner diameter, and the deviation of the thickness in the circumferential direction is 3.0% or less as processed.Type: ApplicationFiled: April 8, 2004Publication date: October 5, 2006Inventors: Kazuhito Kenmochi, Takuya Nagahama, Kei Sakata, Koji Sugano, Toshio Ohnishi, Akira Yorifuji, Takaaki Toyooka
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Patent number: 6375059Abstract: A method and apparatus for smoothing a thick walled portion of a steel pipe produced by pressure-welding two opposite longitudinal edges of an open pipe with a squeeze roll after being subjected to induction heating. Outer and inner reduction rollers pressure sandwiches the thick walled portion from the outer and inner surfaces of the pipe, a support supports the inner reduction roller to be rotatable and containing a water passage for cooling water, a connecting rod connects the support device to a coupler and contains a further water passage for feeding cooling water to the water passage, and an anchor holds the connecting rod. In the method of producing steel pipes two opposite longitudinal edges of the open pipe are preformed before being subjected to the induction heating and thereafter a thick walled portion is smoothed by the above-described.Type: GrantFiled: January 16, 2001Date of Patent: April 23, 2002Assignee: Kawasaki Steel CorporationInventors: Toshio Ohnishi, Masahiro Kagawa, Yoshnori Sugie, Koji Sugano, Nobuki Tanaka, Kingo Sawada, Masao Shoji, Takaaki Toyooka, Yuji Hashimoto, Motoaki Itadani, Akira Yorifuji, Masanori Nishimori
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Publication number: 20010013533Abstract: A method and apparatus for smoothing a thick walled portion of a steel pipe produced by pressure-welding two opposite longitudinal edges of an open pipe with a squeeze roll after being subjected to induction heating. Outer and inner reduction rollers pressure sandwiches the thick walled portion from the outer and inner surfaces of the pipe, a support supports the inner reduction roller to be rotatable and containing a water passage for cooling water, a connecting rod connects the support device to a coupler and contains a further water passage for feeding cooling water to the water passage, and an anchor holds the connecting rod. In the method of producing steel pipes two opposite longitudinal edges of the open pipe are preformed before being subjected to the induction heating and thereafter a thick walled portion is smoothed by the above-described.Type: ApplicationFiled: January 16, 2001Publication date: August 16, 2001Applicant: Kawasaki Steel CorporationInventors: Toshio Ohnishi, Masahiro Kagawa, Yoshnori Sugie, Koji Sugano, Nobuki Tanaka, Kingo Sawada, Masao Shoji, Takaaki Toyooka, Yuji Hashimoto, Motoaki Itadani, Akira Yorifuji, Masanori Nishimori
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Patent number: 6216511Abstract: A method and apparatus for smoothing a thick walled portion of a steel pipe produced by pressure-welding two opposite longitudinal edges of an open pipe with a squeeze roll after being subjected to induction heating. Outer and inner reduction rollers pressure sandwiches the thick walled portion from the outer and inner surfaces of the pipe, a support supports the inner reduction roller to be rotatable and containing a water passage for cooling water, a connecting rod connects the support device to a coupler and contains a further water passage for feeding cooling water to the water passage, and an anchor holds the connecting rod. In the a method of producing steel pipes two opposite longitudinal edges of the open pipe are preformed before being subjected to the induction heating and thereafter a thick walled portion is smoothed by the above-described apparatus.Type: GrantFiled: March 27, 1998Date of Patent: April 17, 2001Assignee: Kawasaki Steel CorporationInventors: Toshio Ohnishi, Masahiro Kagawa, Yoshnori Sugie, Koji Sugano, Nobuki Tanaka, Kingo Sawada, Masao Shoji, Takaaki Toyooka, Yuji Hashimoto, Motoaki Itadani, Akira Yorifuji, Masanori Nishimori
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Patent number: 6216940Abstract: A forming stand for continuously forming a skelp material into a pipe, by pressure of spaced-apart forming rolls supported by spaced upper and lower shafts, the forming rolls having two portions, with one portion fixedly fitted on one side of its shaft, a sleeve slidably fitted to the other end of the shaft and fixedly secured to the sleeve and slidable with respect to the shaft; a bearing box for supporting one side of the associated shaft; a bearing box supporting the other side of the associated shaft through the sleeve; upper and lower stand supporting frames for supporting both of the bearing boxes to be movable in an axial direction; and supporting columns for supporting the stand supporting frames; the pipe-forming force is continuously measured and the forming operation is adjusted such that the measured value of pipe-forming force does not exceed a predetermined pipe-forming upper limit.Type: GrantFiled: February 17, 2000Date of Patent: April 17, 2001Assignees: Kawasaki Steel Corporation, Kusakabe Electric & Machinery Co., Ltd., both ofInventors: Koji Sugano, Masahiro Kagawa, Toshio Ohnishi, Kingo Sawada, Yoshinori Sugie, Nobuki Tanaka, Takaaki Toyooka, Motoaki Itadani, Yuji Hashimoto, Ryoji Kusakabe, Kazuo Omura
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Patent number: 6041632Abstract: A forming stand for continuously forming a skelp material into a pipe, by pressure of spaced-apart forming rolls supported by spaced upper and lower shafts, the forming rolls having two portions, with one portion fixedly fitted on one side of its shaft, a sleeve slidably fitted to the other end of the shaft and fixedly secured to the sleeve and slidable with respect to the shaft; a bearing box for supporting one side of the associated shaft; a bearing box supporting the other side of the associated shaft through the sleeve; upper and lower stand supporting frames for supporting both of the bearing boxes to be movable in an axial direction; and supporting columns for supporting the stand supporting frames; the pipe-forming force is continuously measured and the forming operation is adjusted such that the measured value of pipe-forming force does not exceed a predetermined pipe-forming upper limit.Type: GrantFiled: September 8, 1998Date of Patent: March 28, 2000Assignees: Kawasaki Steel Corporation, Kusakabe Electric & Machinery Co., Ltd.Inventors: Koji Sugano, Masahiro Kagawa, Toshio Ohnishi, Kingo Sawada, Yoshinori Sugie, Nobuki Tanaka, Takaaki Toyooka, Motoaki Itadani, Yuji Hashimoto, Ryoji Kusakabe, Kazuo Omura
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Patent number: 6006789Abstract: A steel mother pipe obtained by a solid phase butt-welding pipe-making process or a welding pipe-making process is reduced by heating the pipe prior to the reduction at a temperature exceeding 100.degree. C. and lower than 800.degree. C. wherein the temperature of the steel pipe being reduced is controlled within a defined range. The temperature difference along the circumferential direction of the mother pipe at the inlet side of a reducer is within a defined range, and the temperature of the steel pipe at interstand positions of the reducer is also controlled. By virtue of this control, the reduction becomes possible at low load while suppressing work hardening without degrading surface properties. The resultant product pipe has a dimensional accuracy maintained at a high level.Type: GrantFiled: January 31, 1997Date of Patent: December 28, 1999Assignee: Kawasaki Steel CorporationInventors: Takaaki Toyooka, Akira Yorifuji, Motoaki Itadani, Toshio Ohnishi, Yuji Hashimoto, Nobuki Tanaka, Hiroyuki Matsui
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Patent number: 5942132Abstract: A method of producing steel pipes is provided which comprises the steps of providing a steel strip, processing the steel strip into a preheated open pipe, preheating the open pipe at its two opposite longitudinal edges at a temperature higher than about the Curie point, heating the open pipe at the two opposite edges at a temperature higher than about 1,300.degree. C. but lower than the melting point of the steel strip, pressure welding the resultant open pipe with a squeeze roll to thereby form a steel pipe, smoothing the steel pipe at its thick-walled portion formed on an outer surface of the welded seam, and subsequently cutting or winding the resulting steel pipe. An apparatus adapted to form the steel pipes is also provided.Type: GrantFiled: June 10, 1997Date of Patent: August 24, 1999Assignee: Kawasaki Steel CorporationInventors: Takaaki Toyooka, Motoaki Itadani, Akira Yorifuji, Yuji Hashimoto, Toshio Ohnishi, Nobuki Tanaka, Yoshinori Sugie, Koji Sugano, Toshiaki Amagasa