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31. 发明专利

JPH03110012A COOLING METHOD FOR PIPE 失效
公开(公告)号：JPH03110012A
公开(公告)日：1991-05-10
申请号：JP24494289
申请日：1989-09-22
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , TAKARA TETSUYA , IKUI KENJI
IPC分类号： B21B45/02 , B21B23/00 , B21B37/00 , B21B37/74 , B21B43/00 , B21B45/00
摘要： PURPOSE:To shorten a cooling time by executing a forced air cooling down to a water coolable upper limit temperature on a water coolable pipe and cooling it with water thereafter. CONSTITUTION:The extraction pitch in a reheating furnace 1 is calculated by a computer 10 and the feeding speed of a cooling floor 5 is controlled in conformity with this pitch. In the case of the reheating furnace 1 being idle, the cooling floor is fed at the lowest speed to obtain the maximum cooling. In the case of the temperature just before the water cooling floor 7 of a water coolable pipe exceeding the upper limit temperature, the water cooling on the water cooling floor 7 is stopped or the feeding of the cooling floor and reheating furnace are stopped until becoming a determined temperature. The water is stopped when the material wrong to be cooled with water comes in the water cooling floor 7.

32. 发明专利

JPH02211904A ROLLING METHOD FOR SEAMLESS STEEL PIPE 失效
公开(公告)号：JPH02211904A
公开(公告)日：1990-08-23
申请号：JP3109689
申请日：1989-02-13
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , AKITA SHINJI , HATANAKA MASAYUKI
IPC分类号： B21B17/14 , B21B23/00
摘要： PURPOSE:To decrease the number of rolls and to decrease the frequencies of roll changes by applying a large rolling reduction to the steel pipe in the 1st stand array consisting of 3-roll stands to a prescribed outside diameter size, and then subjecting the pipe to finish rolling in the 2nd stand consisting of 2-roll stands. CONSTITUTION:The 1st stand array I is installed with No.1 to No.22 each of which is disposed with 3 pieces of rolls R11, R12, R13 having nearly semicircu lar calibers at 120 deg. intervals and which are deviated with the roll shafts of the adjacent stands by 60 deg. each. The 2nd stand array II is installed, in series on the outlet side of the 1st stand array I, with two units of the stands No.23 and No.24 each of which is disposed to two pieces of the rolls R1, R2 having nearly the semicircular calibers at 180 deg. interval and facing each other and which are shifted in the roll shafts of the adjacent stands by 90 deg.. The steel pipe is rolled to the prescribed outside diameter size at a large decrease rate of the outside diameter in the 1st stand array I and thereafter, the steel pipe is subjected to finish rolling by finely adjusting the outside diameter thereof to a prescribed size by the 2nd stand array II adjusted in the caliber size by screw down devices 5 to 8.

33. 发明专利

JPH0264195A SEAMLESS STEEL PIPE-PRODUCING LUBRICANT CONTAINING GILSONITE FINE POWDER 失效
公开(公告)号：JPH0264195A
公开(公告)日：1990-03-05
申请号：JP21362288
申请日：1988-08-30
申请人： NIPPON KOKAN KK , YUSHIRO CHEM IND
发明人： TANAKA MEGUMI , SAKURA HIROMOCHI , ODA TATSUHARU , HIRAKAWA TOMOYUKI , SOTANI YASUHIRO , KAJIYAMA FUYUHIKO , KANDA NOBORU , HOSONO HIROO , WAKABAYASHI TOSHITAKA , HASEGAWA JUN
IPC分类号： C10M173/00 , C10N10/02 , C10N20/00 , C10N20/06 , C10N30/06 , C10N30/08 , C10N40/24 , C10N50/02
摘要： PURPOSE:To obtain the title lubricant capable of providing water resistance, impact resistance and good lubricating properties by adding a salt of polybasic high-molecular weight acid to a composition consisting of a graphite fine powder, gilsonite fine powder and fine-particle synthetic resin insoluble in water and dispersing the blend into water. CONSTITUTION:The aimed lubricant obtained by adding one or more kind of salts of polybasic high-molecular weight acid selected from (D) humic acid, nitrohumic acid and ligninsulfonic acid to a composition consisting essentially of fine-particle synthetic resin insoluble in water consisting of (A) graphite fine powder, preferably having

34. 发明专利

JP2002035811A PLUG SHIFTING APPARATUS OF PLUG MILL 失效
公开(公告)号：JP2002035811A
公开(公告)日：2002-02-05
申请号：JP2000219924
申请日：2000-07-21
申请人： NIPPON KOKAN KK
发明人： SUGIYAMA TSUTOMU , ODA TATSUHARU , YAMAZAKI MOTOHARU
IPC分类号： B21B17/08
摘要： PROBLEM TO BE SOLVED: To improve the plug life of the plug mill. SOLUTION: A plug shifting apparatus which shifts the plug in the axial direction and a mandrel anchor which receives rolling reaction force operating a mandrel bar 1 to support the plug consists of a fixed wedge 3, and a movable wedge 5 lifting and lowering with a jack 4 and the plug shifting apparatus of the plug mill which shifts the plug in the axial direction by shifting the collar section 1a provided in the mandrel bar 1 with the movable wedge 5.

35. 发明专利

JP2001259713A METHOD OF MANUFACTURING SEAMLESS STEEL TUBE 失效
公开(公告)号：JP2001259713A
公开(公告)日：2001-09-25
申请号：JP2000081348
申请日：2000-03-23
申请人： NIPPON KOKAN KK
发明人： KATSUMURA TATSURO , AZUMA SHOZO , ARIIZUMI TAKASHI , ODA TATSUHARU , YAMAZAKI MOTOHARU
IPC分类号： B21B19/04 , B21B25/04 , C22C38/44
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive and simple manufacturing method of a seamless steel tube by which damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like. SOLUTION: In a Mannesmann skew piercing process, using a hollow billet having a through hole in the center part of a cross section, when the billet is pierced and a lubricant supply tube is inserted into the through hole from the rear end of the billet, thereby supplying a lubricant into the through hole.

36. 发明专利

JP2556094B2 失效
公开(公告)号：JP2556094B2
公开(公告)日：1996-11-20
申请号：JP12135488
申请日：1988-05-18
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , KINOSHITA HARUHIKO , TANAKA MEGUMI
IPC分类号： B21B23/00

37. 发明专利

JPH0586291B2 失效
公开(公告)号：JPH0586291B2
公开(公告)日：1993-12-10
申请号：JP8718886
申请日：1986-04-17
申请人： NIPPON KOKAN KK
发明人： FUSHIMI NAOYA , SAITO MORIO , NUMANO MASAMUTSU , HATANAKA MASAYUKI , TANAKA MEGUMI , ODA TATSUHARU
IPC分类号： B21B37/48 , B21B37/00 , B21B37/78

38. 发明专利

JPH03169409A WALL THICKNESS CONTROL METHOD OF REDUCING MILL 失效
公开(公告)号：JPH03169409A
公开(公告)日：1991-07-23
申请号：JP30865689
申请日：1989-11-28
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , IKUI KENJI , KAJIYAMA FUYUHIKO
IPC分类号： B21B17/14 , B21B37/18 , B21B37/78
摘要： PURPOSE:To form a shell as a prescribed target by comparing a measured wall thickness with a set value of the wall thickness of tube that is preliminarily stored, operating the difference of the both and changing the stretch factor of reducing mill. CONSTITUTION:The prescribed wall thickness is preliminarily set in a computer 5 and a wall thickness that is measured with a thickness measuring apparatus 2 is compared with the standard taper quantity. First, whether the measured taper quantity is smaller than the standard taper quantity is compared. And, in the case this is smaller, signals are sent to the reducing mill 4 and the stretch factor is increased. While, in the case the measured taper quantity of shell isn't smaller than the standard taper quantity, either this is larger than or the measured taper quantity of shell is equal to the standard taper quantity is decided. In the case the measured taper quantity is larger than the standard taper quantity, signals are sent to the reducing mill 4 and the stretch factor is decreased. And, in the case the measured taper quantity of shell and the standard taper quantity are equal, the stretch factor is taken as no change.

39. 发明专利

JPH03165905A MANDREL BAR 失效
公开(公告)号：JPH03165905A
公开(公告)日：1991-07-17
申请号：JP30570689
申请日：1989-11-24
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , OKAZAKI KOZO , AKUTSU KATSUO
IPC分类号： B21B25/00
摘要： PURPOSE:To improve the durability of mandrel bar by forming a mandrel bar into a tapered shape so as to reduce the cross sectional area of mandrel bar gradually toward a plug in the attaching part to the plug. CONSTITUTION:The mandrel bar 1 consists of the bar 2 and plug 3. The bar 2 is made into a tapered shape so as to reduce the cross sectional area of the attaching part 2a to the plug 3 gradually toward the plug 3. Because the attaching part 2a is made into a tapered shape, even if the diameter of the bar 2 is larger than the diameter of the plug 3, the inner surface of a pierced pipe 10 isn't scratched. Because the bar 2 with a larger diameter than the diame ter of the plug 3 can be used, the durability of the mandrel bar 1 can improved.

40. 发明专利

JPH0332409A EQUIPMENT FOR MANUFACTURING SEAMLESS STEEL TUBE 失效
公开(公告)号：JPH0332409A
公开(公告)日：1991-02-13
申请号：JP16636389
申请日：1989-06-28
申请人： NIPPON KOKAN KK
发明人： ODA TATSUHARU , AKITA SHINJI , KAJIYAMA FUYUHIKO , YAMAZAKI KAZUO , TODO KUNIO
IPC分类号： B21B17/02 , B21B17/04 , B21B23/00
摘要： PURPOSE:To obtain tube material having prescribed outer diameters and different in level from hollow stocks equal in outer diameter through a simple structure by providing a mandrel mill and a shell sizer which can assemble plural rolls right before the inlet side of the mandrel mill. CONSTITUTION:The mandrel mill and the shell sizer 22 in which three rolls are assembled right before the inlet side of the mandrel mill are provided. The shell sizer 22 is arranged right before the inlet side of the mandrel mill and positioned on the same line that the mandrel mill is. Accordingly, an intermediate tube stock into which a mandrel mill bar is inserted is reduced by the shell sizer 22 to a prescribed outer diameter. The shell sizer 22 drives all rolls 23a, 23b, 23c by one motor 24 through a bevel gear stored in a gear box 25. In this way, tube material having prescribed outer diameters and different in level is obtained from hollow tube stocks equal in outer diameter.

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