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1. 发明专利

JPH05287464A 失效
公开(公告)号：JPH05287464A
公开(公告)日：1993-11-02
申请号：JP11317992
申请日：1992-04-07
申请人： NIPPON KOKAN KK , TOSHIBA ENG & CONSTR
发明人： TAKAMURA TOSHIHIRO , NISHINO YUKIO , TERAOKA KOZO , OYAMA MOTOAKI , AKIYAMA KOJI , ARIMA TAKEO
IPC分类号： B23K9/23 , C22C38/00 , C22C38/22
摘要： PURPOSE:To omit preheating treatment and postheating treatment at the time of welding to a steel tube of the same kind and a joint by producing a steel tube by means of TIG welding by using a steel plate of specific thickness prepared by controlling respective contents of C, Mn, P, S, etc., in a Cr-Mo steel. CONSTITUTION:A steel plate of

2. 发明专利

JPS61202721A MANUFACTURE OF BILLET FOR CLAD PIPE 失效
公开(公告)号：JPS61202721A
公开(公告)日：1986-09-08
申请号：JP4284985
申请日：1985-03-06
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , TOYAMA AKIRA , FURUKAWA HIDETOSHI , ARAI SEIICHI , TERAOKA KOZO
IPC分类号： B21C23/22 , B21B17/00 , B21B19/04
摘要： PURPOSE:To manufacture a clad pipe having a well adhered mating surface of inner and outer pipes by extracting air in the clearance between inner and outer piper stocks through a groove formed in the peripheral direction between both pipe stocks and a vent hole communicated to the groove. CONSTITUTION:An outer pipe stock 1 is provided with a vent hole 3 communicated to its inside space, and an inner pipe stock 2 is provided with a groove 4 in the peripheral direction of a position opposite to the vent hole 3. The outer pipe stock 1 is put in a vessel 5 in a state of inserting the inner pipe stock 2 into its inside space, and the inside of vessel 5 is evacuated into vacuum to extract air in the clearance between both pipe stocks 1, 2. After completing the air extraction, both ends of pipe stocks 1, 2 are sealed by welding 6 and the vent hole 3 is blocked 7, in the inside of vessel 5 kept in vacuum, to manufacture a billet for double-ply pipe.

3. 发明专利

JPS61192417A MANUFACTURE OF BILLET FOR DOUBLE PIPE 失效
公开(公告)号：JPS61192417A
公开(公告)日：1986-08-27
申请号：JP3276285
申请日：1985-02-22
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , ARAI SEIICHI , FURUKAWA HIDETOSHI , TERAOKA KOZO , BANBA TOSHIJI
IPC分类号： B23P11/02 , B21C23/22
摘要： PURPOSE:To secure the superior close adhesiveness between the fitting surfaces of the outer and inner pipe members by purging the air in the inside space of the outer pipe member by the N2 gas which is not harmful for the close adhesiveness, in the manufacture of a double pipe billet through the shrink fitting of a cylindrical inner pipe member into a cylindrical outer pipe member. CONSTITUTION:An outer pipe member 1 is fixedly supported in erection form onto a supporting board 6 in a cylindrical body 5, and N2 gas is supplied into the inside space S of the outer pipe member 1 from the lower edge side through a feeding hole 8 inside the supporting board, and an inner pipe member 2 is fitted from the upper edge side and shrink-fitted. A heating apparatus 7 is installed in the peripheral direction in the upper part of the cylindrical body 5, and heats the outer pipe member 1. N2 gas is supplied not only into the inside space of the outer pipe member but into the part between the cylindrical body 5 and the outer pipe member 1 from the lower part, and the N2 gas purging effect in the inside space S is improved. Though the N2 gas is charged in substitution for air into the fitting surface between the inner and outer pipe members 2 and 1, the superior close adhesiveness between the fitting surfaces of the both pipes can be secured, since N2 gas solid-solved into metal structure.

4. 发明专利

JPS61199946A BILLET FOR DOUBLE PIPE 失效
公开(公告)号：JPS61199946A
公开(公告)日：1986-09-04
申请号：JP4100885
申请日：1985-03-04
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , TOYAMA AKIRA , ARAI SEIICHI , FURUKAWA HIDETOSHI , TERAOKA KOZO
IPC分类号： B32B1/08 , B32B15/01

5. 发明专利

JPS6341649B2 失效
公开(公告)号：JPS6341649B2
公开(公告)日：1988-08-18
申请号：JP4195985
申请日：1985-03-05
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , FURUKAWA HIDETOSHI , ARAI SEIICHI , TERAOKA KOZO
IPC分类号： B21C23/22 , B21B17/00 , B21B19/04 , B23K20/00

6. 发明专利

JPS61202720A BILLET FOR CLAD PIPE 失效
公开(公告)号：JPS61202720A
公开(公告)日：1986-09-08
申请号：JP4195985
申请日：1985-03-05
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , FURUKAWA HIDETOSHI , ARAI SEIICHI , TERAOKA KOZO
IPC分类号： B21C23/22 , B21B17/00 , B21B19/04 , B23K20/00
摘要： PURPOSE:To secure sealing ability in hot working, by shrinkage fitting together outer and inner pipe stocks, having different linear thermal coefficients of expansion respectively, to seal their top parts by welding, and projecting the pipe stock, having the smaller coefficient of expansion, at their bottom parts to bulge it in the edge direction of the other pipe end. CONSTITUTION:A cylindrical inner pipe stock 2 having a large linear thermal coefficient of expansion is inserted into the inside space of a cylindrical outer pipe stock 1, having a small linear thermal coefficient of expansion, by shrinkage fitting. The T side, the top of this billet at the time of hot working, is sealed 4 by welding. On the other hand, at the B side, the bottom of this billet, the end of outer pipe 1 is projected from the end of inner piper 2, and the inner peripheral surface 3 of its projected part (e) is bulged from the end-edge contact position P of pipe 2 to the direction of inner pipe stock 2. In this way, the invasion of air into between the outer and inner pipe stocks is properly prevented at the time of hot working, and moreover its manufacturing process is simplified.

7. 发明专利

JPS61199504A MANUFACTURE OF DOUBLE PIPE 失效
公开(公告)号：JPS61199504A
公开(公告)日：1986-09-04
申请号：JP3865985
申请日：1985-03-01
申请人： NIPPON KOKAN KK
发明人： TATSUMI TADAKUNI , ARAI SEIICHI , FURUKAWA HIDETOSHI , TERAOKA KOZO
IPC分类号： B21B23/00 , B21B17/00 , B21B19/04 , B21C23/00
摘要： PURPOSE:To prevent an invasion of air to a fitting part by a simple technique and to improve the productivity of the titled pipe, by providing a glass material to a groove formed at the lapping part of both ends of inner and outer pipe- stock billets, fitted together by hot working, and melt sealing the groove by heating the billets. CONSTITUTION:A groove 4 is formed at an annular lapped part 3 at both ends of an outer pipe stock 1 and a cylindrical or columnar inner pipe stock 2 inserted to the stock 1 in a fitted state. Glass materials of low and high viscosities are provided to the deep part and surface of the groove 4 respectively to melt them by heating 5 the billet A in order to perfectly seal the fitted part without causing the effluence of glass. In this way, the invasion of air is prevented by a simple technique, and the productivity of a tightly contacting double pipe is enhanced.

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