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31. 发明专利

JPH1199456A FINISHING-POLISH METHOD OF METAL PIPE INNER SURFACE 失效
公开(公告)号：JPH1199456A
公开(公告)日：1999-04-13
申请号：JP26336897
申请日：1997-09-29
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , KUROBE ATSUSHI , NAKAMOTO KAZUNARI
IPC分类号： B24B5/40 , B24B21/00
摘要： PROBLEM TO BE SOLVED: To provide a metal pipe whose inner surface is polishingly finished uniformly both in an L direction and in a C direction. SOLUTION: The inner surface of a metal pipe 1 is finishingly polished by pressing polishing belts 4a, 4b on the pipe inner surface by elastic restoring force of an elastic ball 7 by molding the polishing belts 4a, 4b cylindrical by inserting the elastic ball 7 inside of the polishing belts 4a, 4b delivered from pay-off reels 2a, 2b, feeding the cylindrical polishing belts 4a, 4b in the inside of the roughly polished metal pipe 1 of inside diameter D (mm) and taking up the polishing belts 4a, 4b delivered from the other end opening of the metal pipe 1. At this time, finishing polish is divided into a plural number (n) of processes so that polishing is carried out more than three times at any point of the pipe inner surface, a rotational angle θ (degree) of the metal pipe to be rotated in each of the processes is specified by an expression of θ=360/n or θ=180/n at the time of n>=5, width W (mm) of the polishing belts used in each of the processes is specified by an expression of W=1.5 πD/n, and less than 50 of the elastic balls are supplied to the inside of the pipe in each of the processes.

32. 发明专利

JPH1094969A GRINDING WHEEL FOR POLISHING AUSTENITE STAINLESS STEEL 失效
公开(公告)号：JPH1094969A
公开(公告)日：1998-04-14
申请号：JP27306696
申请日：1996-09-24
申请人： NISSHIN STEEL CO LTD
发明人： ENOKI KOJI , OTSUKA MASAHITO , NAKAMOTO KAZUNARI
IPC分类号： B24D3/00 , B24D3/32
摘要： PROBLEM TO BE SOLVED: To remarkably improve the polishing capacity by specifying the abrasive grain rate of a resin bond grinding/wheel in which a white alundum is dispersed as the abrasive grain, the rate of binder and the porosity. SOLUTION: The polishing by the free abrasive grain is effective in the case when a member to be polished, having the ductility and high work hardening is polished, and the polishing capacity is increased by increasing the abrasive grain rate while considering the balance with the binder. The abrasive grain grasping force is stabilized corresponding to the increase of the binder, but the rate of the binder should be controlled to get the optimum and maximum polishing capacity, because the surface quality is deteriorated when the quantity of the binder is over a specific extent. Further the quantity of the chip pockets (pores) having the function of chipping, is increased. That is, the surface can be polished and finished in a good condition by a small number of times of polishing, by keeping 38-45 volume % of the grain rate, 22-35 volume % of the binder rate, and 32-45 volume % of the porosity.

33. 发明专利

JPH1043949A INTERNAL SURFACE POLISHING METHOD AND DEVICE FOR METALLIC PIPE 失效
公开(公告)号：JPH1043949A
公开(公告)日：1998-02-17
申请号：JP21656496
申请日：1996-07-30
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , ENOKI KOJI , KUROBE ATSUSHI , NAKAMOTO KAZUNARI
IPC分类号： B24B21/00 , B23H5/00 , B24B21/02
摘要： PROBLEM TO BE SOLVED: To accurately polish an internal surface of a metallic pipe with the simple equipment constitution. SOLUTION: Flat polshing belts 4a and 4b are sent out of reels 2a and 2b, and after being molded in a semicircular shape, width directional end parts are butted against each other, and are formed in a cylindrical shape. In the middle of being molded in a cylindrical shape, elastic balls 7, 7... are wrapped inside the polishing belts 4a and 4b, and next, the polishing belts 4a and 4b are sent inside a metallic pipe 1. The polishing belts 4a and 4b are slidingly moved by the elastic balls 7 while pressing them to an inside surface of the metallic pipe 1, and the polishing belts 4a and 4b sent out of the other end opening are wound round reels 3a and 3b, and the elastic balls 7, 7... are recovered. A polishing belt sent out of a single reel is molded in a cylindrical shape, and the polishing belt can be sent inside the metallic pipe being a polishing object from one end opening. After one time polishing process is finished, the metallic pipe is rotated by 90 degrees, and the polishing belt is sent inside the metallic pipe from the same direction or the inverse direction, and when polising of an internal surface is repeated, an unpolished part caused by a seam of the polishing belt can be eliminated.

34. 发明专利

JP2003117615A WELDED STEEL TUBE FOR CURLING WORK 审中-公开
公开(公告)号：JP2003117615A
公开(公告)日：2003-04-23
申请号：JP2001313103
申请日：2001-10-10
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , ISHIKAWA HANJI
IPC分类号： F16L9/02 , B21C37/15 , B21D19/12 , B21D53/84
摘要： PROBLEM TO BE SOLVED: To provide a welded steel tube for curling work without causing any depression (recessed part) when performing curling work. SOLUTION: By forcing the welded steal tube P the ground surface of the inside bead of which is made higher than the inside surface of a tube stock, also the ground surface of the outside bead of which is made higher than the outside surface of the tube stock and the thickness in the weld zone of which is made thicker than the thickness of the tube stock with a curling die 3, a curling product without the depression in the weld zone is obtained.

35. 发明专利

JP2001179368A METHOD OF EXPANDING STEEL TUBE END 失效
公开(公告)号：JP2001179368A
公开(公告)日：2001-07-03
申请号：JP36629599
申请日：1999-12-24
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , MIURA NORIMASA , NAKAMOTO KAZUNARI
IPC分类号： B21D41/02 , B29C57/02
摘要： PROBLEM TO BE SOLVED: To provide a method of expanding tubes that prevents cracks starting on the tube ends from spreading all over the expanded parts of tubes when tubes are expanded with punches. SOLUTION: When a steel tube is expanded by forcing a punch into the end of the steel tube, a punch with a preset, tapered angle ranging from 30 to 60 degrees and an outer die are used. By doing this, cracks starting on the edges of tubes caused by expanding are prevented from spreading all over the expanded parts of tubes.

36. 发明专利

JPH11254284A INNER SURFACE POLISHING METHOD OF SANITARY STAINLESS STEEL PIPE 失效
公开(公告)号：JPH11254284A
公开(公告)日：1999-09-21
申请号：JP7860898
申请日：1998-03-12
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , KUROBE ATSUSHI , NAKAMOTO KAZUNARI
IPC分类号： B24B21/00
摘要： PROBLEM TO BE SOLVED: To provide methods for rough polishing and finish polishing of an inner surface of a sanitary stainless steel pipe efficiently with the same equipment by adjusting a polishing pressure and grain size number count of a polishing belt. SOLUTION: An electric ball is inserted in the inside of polishing belts fed out from payoff reels 2a, 2b, the polishing belts 4a, 4b are molded in a cylindrical, shape, and the cylindrical polishing belts 4a, 4b are fed into the inside of a stainless steel pipe. In the case of polishing an inner surface of the pipe by winding the polishing belts 4a, 4b fed out from an opening in the other end of the pipe to a winding reel so as to press the polishing belts 4a, 4b to the inner surface of the pipe with elastic restoration force of the elastic ball, the polishing belts 4a, 4b of #60 to #240 grain size number count are used, a polishing pressure is adjusted to a range of 0.28G+183.2

37. 发明专利

JPH1199469A INNER SURFACE POLISHING METHOD FOR METAL TUBE 失效
公开(公告)号：JPH1199469A
公开(公告)日：1999-04-13
申请号：JP28118897
申请日：1997-09-30
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , KUROBE ATSUSHI , NAKAMOTO KAZUNARI
IPC分类号： B24B37/00
摘要： PROBLEM TO BE SOLVED: To improve surface gloss by pressing polishing nonwoven fabric to the inner surface of a pipe by a ferromagnetic body magnetized by a magnetic field of a magnet, supplying a nitric acid solution in the pipe, and relatively moving the magnet or the pipe. SOLUTION: An electromagnet 8 is arranged outside a pipe 1 as a material to be polished, and a block-like ferromagnetic body 4 to which a polishing non-woven fabric is stuck is inserted in the pipe 1. By the ferromagnetic body 4 magnetized by a magnetic field of the electromagnet 8, the polishing non- woven fabric is pressed to the inner surface of the pipe 1. Secondly, a solution of about 3% nitric acid is supplied into the pipe 1, and the pipe 1 is rotated to relatively move the pipe 1 to the ferromagnetic body 4. Thus, inner surface polishing is performed for the pipe 1. Scratch in the circumferential direction of the pipe is found in the polished surface, but it is a smooth surface which has favorable surface gloss and the surface roughness Ry of about 0.1 μm.

38. 发明专利

JPH1094968A GRINDING WHEEL FOR POLISHING HIGH CHROMIUM FERRITE STAINESS STEEL 失效
公开(公告)号：JPH1094968A
公开(公告)日：1998-04-14
申请号：JP27306596
申请日：1996-09-24
申请人： NISSHIN STEEL CO LTD
发明人： ENOKI KOJI , OTSUKA MASAHITO , NAKAMOTO KAZUNARI
IPC分类号： B24D3/00 , B24D3/32
摘要： PROBLEM TO BE SOLVED: To remove the surface ripple marks of a stainless steel by the almost one pass polishing, and obtain the specific surface roughness with high workability, by specifying the abrasive grain rate, the binder rate, and the porosity. SOLUTION: The abrasive grain of white alundum WA is dispersed into PVA, to increase the grain rate to improve the polishing capacity. But the abrasive grain is made to be sufficiently held by the binder, because the dropping of the abrasive grain is increased when the balance between the abrasive grain and the binder is lost, which prevents the effective polishing by the fixed abrasive grain. The binder having the high grasping force, is selected, and the binder percentage is adjusted to obtain the optimum and maximum polishing capacity. Further it is unnecessary to increase the pores, so that the loading and the lowering of the surface quality can be prevented. That is, the surface can be effectively polished and finished by the small number of times of the polishing, by keeping 25-33 volume % of the grain rate, 17-28 volume % of the binder rate, and 45-54 volume % of the porosity.

39. 发明专利

JPH1058311A MAGNETIC POLISHING JIG FOR PIPE INTERNAL SURFACE 失效
公开(公告)号：JPH1058311A
公开(公告)日：1998-03-03
申请号：JP22933896
申请日：1996-08-12
申请人： NISSHIN STEEL CO LTD
发明人： OTSUKA MASAHITO , ENOKI KOJI , KUROBE ATSUSHI , NAKAMOTO KAZUNARI
IPC分类号： B24B37/00
摘要： PROBLEM TO BE SOLVED: To provide an internal surface polishing jig capable of polishing the internal surface of a pipe at high productivity. and allowing easy insertion and pulling out in and from a pipe. SOLUTION: This magnetic polishing jig for the internal surface of a pipe is equipped with a nonmagnetic mandrel 10 of rectangular cross section, a plurality of magnetic blocks 20 of cubic shape except for the sides faced to the internal surface of a pipe as a polished material and formed as the circular arc sides 21, and buffs or abrasive nonwoven fabric 24 secured to the circular arc sides 21 of the magnetic blocks 20. Furthermore, each magnetic block 20 is formed to have a rectangular mouth part 22 wider than the rectangular cross section of the nonmagnetic mandrel 10, and a plurality of the magnetic blocks 20 are mounted on the nonmagnetic mandrel 10, so that a distance from the inner periphery of the rectangular mouth part 22 to the circular arc side 21 is longer than a distance from the inner periphery of the mouth part 22 to the other side, and the circular arc sides 21 are alternately directed in an opposite direction. Thus, polishing nonwoven fabric 24 is pressed to pipe internal surface. due to a magnetic force for attracting the magnetic blocks 20, thereby polishing the internal surface of the pipe.

40. 发明专利

JPH1049869A MANUFACTURE OF HARD DISK SUBSTRATE 失效
公开(公告)号：JPH1049869A
公开(公告)日：1998-02-20
申请号：JP21656596
申请日：1996-07-30
申请人： NISSHIN STEEL CO LTD
发明人： ENOKI KOJI , OTSUKA MASAHITO , NAKAMOTO KAZUNARI
IPC分类号： C03C8/00 , G11B5/73 , G11B5/82 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a highly reliable hard disk substrate which has superior shock resistance and can be made light in weight. SOLUTION: Countless minute hole parts are formed in a non-magnetic austenite stainless steel foil to constitute a porous core material 1. Glass layers 2, 2 are provided on the both faces of the core material 1. The glass layers 2, 2 are formed by applying a glass paste of a low melting point to surfaces of the steel foil, pressuring and baking the glass paste. Since the core material 1 is a stainless foil with countless minute hole parts, the material is rigidly bonded with the glass layers 2, 2 and never brings about a large thermal stress which would cause a malfunction.

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