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1. 发明专利

JPH0446654B2 失效
公开(公告)号：JPH0446654B2
公开(公告)日：1992-07-30
申请号：JP6926483
申请日：1983-04-21
申请人： NIPPON KOKAN KK
发明人： KAWABATA SHIGEO , SAITO MORIO , FUSHIMI NAOYA , AKITA SHINJI , TANAKA MEGUMI , HATANAKA MASAYUKI , KAMATA SHOSEI , MIHARA YUTAKA , HIRAKAWA TOMOYUKI
IPC分类号： B21B17/02 , B21B37/18 , B21B37/78

2. 发明专利

JPH03138008A CONTROLLER FOR ROLLING SEAMLESS TUBE 失效
公开(公告)号：JPH03138008A
公开(公告)日：1991-06-12
申请号：JP27614089
申请日：1989-10-25
申请人： NIPPON KOKAN KK
发明人： FUSHIMI NAOYA , AKITA SHINJI , HATANAKA MASAYUKI , TAKAHASHI HIROYUKI
IPC分类号： B21B17/02 , B21B23/00 , B21B37/00 , B21B37/70 , B21B37/78
摘要： PURPOSE:To control the length or wall thickness of a tube with good accuracy to a specified value by measuring the weight of a billet from which scale is stripped and controlling the number of rotation of the roll of a mandrel mill and its gap in accordance with the weight of the billet, etc. CONSTITUTION:The billet taken out of a heating furnace 1 is pierced by a piercer 2 and the scale which is stuck at that time is stripped off. Then, the billets are rearranged on an alignment line and at this time a weighing machine 11 measures the weight of the billet from which scale is stripped. The result measured by the weighing machine 11 is inputted to an arithmetic and control unit 7. A length meter and outer diameter gage measure the length and outer diameter of the tube shaped by a sizer 6 respectively and they are inputted into the arithmetic and control unit 7. The arithmetic and control unit 7 operates the number of rotation of the roll of the mandrel mill 5 and its nip between the rolls in accordance with the inputted information and deliver them to a sequencer 8 for controlling the equipment. The sequencer 8 controls the mandrel mill 5 in accordance with the input information. The billet is rolled by the mill 5 in a tubular shape and then shaped by the sizer 6.

3. 发明专利

JPH0390205A BAR CONSTRAINING TYPE ROLLING EQUIPMENT 失效
公开(公告)号：JPH0390205A
公开(公告)日：1991-04-16
申请号：JP22467989
申请日：1989-09-01
申请人： NIPPON KOKAN KK
发明人： SAKURA HIROMOCHI , AKITA SHINJI , HATANAKA MASAYUKI , OKAMOTO YOSHIHIDE
IPC分类号： B21B25/04
摘要： PURPOSE:To surely apply a lubricating oil and to improve quality by providing a coating device of a lubricant at the inlet side of a mandrel mill and applying the lubricant on the mandrel bar which retreats by completing rolling. CONSTITUTION:When a mandrel bar 2 starts to retreat on completion of the rolling of a hollow blank pipe 12a by a mandrel mill 8, a pump 22 is actuated, a lubricant is forcibly fed to a nozzle ring 17 and injected from a nozzle and applied on the mandrel bar 2. On its coating in a specific range the pump 22 is stopped and the coating is finished. At this time, because of the mandrel bar 2 being just after being drawn from the hollow blank pipe 12a, the surface temp. is maintained at about >=100 deg.C and so, the drying after coating of the lubricant is fast and a tough film is formed.

4. 发明专利

JPH0116203B2 失效
公开(公告)号：JPH0116203B2
公开(公告)日：1989-03-23
申请号：JP7012783
申请日：1983-04-22
申请人： NIPPON KOKAN KK
发明人： KAWABATA SHIGEO , KOMINE ISAMU , YOSHIDA MASATO , FUSHIMI NAOYA , AKITA SHINJI , TANAKA MEGUMI , HATANAKA MASAYUKI
IPC分类号： B21B25/04

5. 发明专利

JPS62244505A PLUG FOR PRODUCING SEAMLESS PIPE 失效
公开(公告)号：JPS62244505A
公开(公告)日：1987-10-24
申请号：JP8702786
申请日：1986-04-17
申请人： NIPPON KOKAN KK
发明人： YAMAZAKI KAZUO , KAJIYAMA FUYUHIKO , AKITA SHINJI
IPC分类号： B21B25/00 , C23C14/06 , C23C14/08 , C23C16/34 , C23C16/40
摘要： PURPOSE:To reduce the production cost and to improve durability by attaching an end member consisting of a sintered hard material to the top end of a plug and forming a hardened surface layer on the surface thereof. CONSTITUTION:The end member 2 consisting of the sintered hard material subjected to a surface hardening treatment is attached by a screw system or adhering, etc., to the top end of a plug base body 1 made of a low alloy steel. A thermally sprayed ceramic layer 3 is then formed on the outside surface of the plug base body 1. The sintered hard materials consisting of WC, TiC, etc., are used for the end member and the surface hardening treatment is executed by a chemical vapor deposition or physical vapor deposition method. The end member 2 consisting of the sintered hard material is disposed to the top end of the plug base body 1 and the outside surface of the base body 1 is coated with the thermally sprayed ceramic layer 3 and therefore, the impact resistance and durability are higher than the impact resistance and durability of the plug constituted of a ceramic material and the cost is reduced.

6. 发明专利

JPS61266112A ROLLING METHOD FOR BLANK PIPE FOR SEAMLESS PIPE BY MANDREL MILL 失效
公开(公告)号：JPS61266112A
公开(公告)日：1986-11-25
申请号：JP10694785
申请日：1985-05-21
申请人： NIPPON KOKAN KK
发明人： FUSHIMI NAOYA , SAITO MORIO , NUMANO MASAMUTSU , AKITA SHINJI , HATANAKA MASAYUKI , KAMATA SHOSEI , MIHARA YUTAKA , HIRAKAWA TOMOYUKI
IPC分类号： B21B17/02 , B21B17/04 , B21B37/00 , B21B37/46 , B21B37/78
摘要： PURPOSE:To eliminate the fluctuation of a wall thickness and to stabilize an operation by adjusting the rotating speeds of rolls and roll gaps in accordance with the moving speed of the blank pipe determined on the inlet side and outlet side of roll stands so that the moving speed of the blank pipe is made equal to a set value. CONSTITUTION:The moving speed on the outlet side is measured by a speedometer 2 when the blank pipe 1 passes through the roll stands A1-An. The roll gaps are determined by a calculator 4 in accordance with the measured values and at the same time the respective roll gaps are adjusted by a roll gap adjuster 3. The moving speed on the inlet side of the roll stand A1 is determined by a calculator 5 for the rotating speed of the rolls so as to attain the roll rotating speed of the roll stand A1 at which the speed is made equal to the preset speed. The fluctuation of the wall thickness of the blank pipe in the axial direction thereof is thus eliminated and the operation is stabilized.

7. 发明专利

JPS60240796A LUBRICANT FOR PRODUCTION OF SEAMLESS STEEL TUBE 失效
公开(公告)号：JPS60240796A
公开(公告)日：1985-11-29
申请号：JP9561984
申请日：1984-05-15
申请人： NIPPON KOKAN KK , YUSHIRO CHEM IND
发明人： AKITA SHINJI , HATANAKA MASAYUKI , ODA TATSUHARU , KANDA NOBORU , YOKOYAMA KENZOU , AOKI KENICHI
IPC分类号： B21B25/04 , C10M111/06 , C10M173/00 , C10M173/02 , C10N20/00 , C10N20/06 , C10N40/24 , C10N50/02 , C10N50/08
摘要： PURPOSE:To obtain a lubricant for the production of seamless steel tubes, which can be fixed to the surface of a mandrel bar over a wide temp. range and has excellent lubricating performance, by dispersing a water-insoluble fine synthetic resin powder, fine gilsonite powder and graphite in water. CONSTITUTION:16-36wt% water-insoluble fine synthetic resin powder, 15-40 wt% gilsonite powder and 30-69wt% graphite are dispersed in water. Optionally, a surfactant, a high-molecular dispersion stabilizer, an alkaline substance, etc. may be used for the purpose of stably dispersing said powders in water. The reason why asphalt component is limited to fine gilsonite powder is that when other asphalt component is used, adherability during film formation is lowered and particularly, the quantity of the depositing lubricant and bond strength are greatly reduced during re-coating. The synthetic resin must be water-insoluble and must have a glass transition temp. lower than the surface temp. of a mandrel bar to be coated with the lubricant.

8. 发明专利

JPS606721B2 失效
公开(公告)号：JPS606721B2
公开(公告)日：1985-02-20
申请号：JP10809481
申请日：1981-07-13
申请人： NIPPON KOKAN KK
发明人： AKITA SHINJI , TANAKA MEGUMI
IPC分类号： B21B17/02 , B21B17/00 , B21B17/14 , B21B31/16 , B21B38/10 , B22D11/16

9. 发明专利

JPS605366B2 失效
公开(公告)号：JPS605366B2
公开(公告)日：1985-02-09
申请号：JP11753776
申请日：1976-09-30
申请人： ISHIKAWAJIMAHARIMA JUKOGYO KK , NIPPON KOKAN KK
发明人： KATO HEIJI , AKITA SHINJI , NUMANO MASAMUTSU
IPC分类号： B21B25/02 , B21B25/00 , B21B25/06

10. 发明专利

JPS60416B2 失效
公开(公告)号：JPS60416B2
公开(公告)日：1985-01-08
申请号：JP7445481
申请日：1981-05-18
申请人： NIPPON KOKAN KK
发明人： AKITA SHINJI
IPC分类号： C21D1/18 , C21D9/08

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