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JP3692597B2 |
To reduce the defective ratio of a hollow stock tube and to improve the yield by predicting the fusing damage of the tip part of a plug based on the measured result of a measuring means of a billet progressing velocity and a measuring me...
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JP2005211911A |
To provide a method for preventing the end crack of a seamless steel pipe in straightening the steel pipe.The method for preventing the end crack in straightening the steel pipe performs roll straightening by heating the steel pipe end b...
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JP2005211912A |
To provide a method for preventing any uneven thickness of a seamless steel tube.In the uneven thickness preventive method of a seamless steel tube, the amplitude of a mandrel during the drilling is measured in a seamless steel tube manu...
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JP2005211920A |
To lighten the load at boring time of a seamless steel pipe with skew rolling, by that linear segregation except the central part in a bloom with a continuous casting is lightened to form only the center segregation and easily perform th...
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JP2005211973A |
To provide a method for minimizing the inside surface flaws of a steel pipe obtained by regulating the relationship between the distribution form and amount of the porosities of a round steel billet which must be controlled by various fa...
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JP2005163167A |
To provide a rotary hearth equipment in a seamless steel tube manufacturing line, and a seamless steel tube manufacturing method using the same.In the rotary hearth equipment in the seamless steel tube manufacturing line, a billet is lif...
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JP3646417B2 |
To reduce the producing cost of a seamless steel tube containing Cr by using saddle type roll having a prescribed angle range of an opening angle at the caliber bottom in one pair of rolls. Rolling reduction is applied to a cast billet 1...
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JP3633434B2 |
To prevent generation of flows on the outer surface of a martensitic stainless steel piece containing Cr: 10.0∼16.0 wt.%, Ni: 1.0∼8.0 wt.% in rolling it. A lower layer of oxide scale produced on the surface of a martensitic stainless...
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JP2005046893A |
To provide a method for suppressing deviation in the wall-thickness of a seamless steel tube which can produce a seamless steel tube having a more even, that is, less deviated wall-thickness in a tubular circumferential direction than a ...
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JP3606949B2 |
The method concerns impact rolling solid or hollow cylindrical components (1) which are fed in the direction of their longitudinal axis (1'). At least one impact roll (4, 5) in an external rotating roll head (2, 3) performs a specified s...
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JP3598771B2 |
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JP2004314172A |
To improve the production efficiency and the reliability of a planetary skew rolling mill in a method for manufacturing a tube from a metallic material.An inner tool (5) is pulled back from the working position (8) by a prescribed amount...
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JP2004306037A |
To provide a control method of hot sizing for finishing the outside diameter of a seamless steel tube into a complete round.The locally incomplete roundness is prevented by controlling the motor current value I and/or the number N of rev...
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JP3578052B2 |
To provide a piercing rolling method of a seamless steel pipe preventing seizure on disk rolls. In piercing rolling of the seamless steel pipe by means of a rolling machine having a pair of disk rolls, the piercing rolling method of the ...
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JP3580197B2 |
To provide a manufacturing method of seamless steel tubes which is devised so as to preliminarily reduce surplus for a small lot of materials. This is a method for manufacturing the seamless steel tubes on a manufacturing line in which a...
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JP2004255427A |
To prevent the outer surface quality of a product from deteriorating by preventing rolling chips seized to a grooved roll edge part from damaging the outer surface of the succeeding material to be rolled in the sizing rolling by a sinkin...
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JP3564314B2 |
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JP2004223592A |
To provide a method for remachining a roll by which shortening of roll remachining time and the reduction of the cost of roll remachining tools and the cost of rolls are realized by reducing the machining allowance in the direction perpe...
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JP2004195468A |
To provide a rolling method and a rolling device by which the miniaturization of the device and the problem of noise are dissolved, not only rolling from the large diameter to the small diameter is enabled, but various rolling operations...
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JP2004122137A |
To provide a manufacturing method of seamless martensitic stainless steel tube by which roll marks are not generated on products even when Mannesmann skew rolling method is adopted.When the seamless steel tube is manufactured in a mandre...
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JP2004098101A |
To suppress the generation of deflected thickness within the range of the specification while improving productivity at the time of manufacturing seamless steel tubes.When a solid-core round billet is heated in the heating furnace, the m...
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JP2004082196A |
To provide a method of rolling a seamless bearing steel tube which has no outside surface defects and which prevents the generation of fine wrinkles equivalent to surface wrinkle defects on the outer surface of the bearing steel tube.In ...
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JP2004082174A |
To provide a method for stably manufacturing the seamless steel tube made of high-alloy steel without performing heavy investment of equipment in the manufacturing line of the seamless steel tube constituting of an inclined piercing mill...
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JP2004082147A |
To provide a rolling method for preventing an empty furnace by changing the temperature of a heating furnace when piercing bearing steel with a piercer.By slowing down the rolling speed by 25-40% in one section of the temperature zone of...
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JP3503552B2 |
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...
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JP3503559B2 |
To provide a piercing method using inclined rolls by which the generation of the pieces of a broken tube at the bottom tube-end after rolling is perfectly prevented. Piercing is performed by providing a small hole in the middle part of t...
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JP2004042047A |
To provide a manufacturing method of a seamless tube by piercing and rolling with a piercer in the of Mannesmann process in which the propulsive force is applied to a billet to prevent slippage by adjusting the angle between the billet a...
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JP2004042138A |
To provide a method and a device by which the three-dimensional variation of the eccentricity of a hollow block along the ordinate of the hollow block is detected and especially the degree of the eccentricity which is actually properly u...
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JP2004037460A |
To provide a method and a device for indicating the actually useful degree of the eccentricity by detecting the three dimensional eccentricity of a hollow block along the vertical coordinates of the hollow block at the entrance of a roll...
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JP3494131B2 |
To efficiently manufacture a seamless steel pipe whose finishing dimension is secured thanks to the continuously manufacturing line since deflected wall thickness in the circumferential direction is less and the thickness in the end of t...
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JP3470686B2 |
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide a method for rol...
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JP2003533592A |
Martensitic stainless steel with high resistance to corrosion, consisting of the following ingredients: Mn from 0.1 % to 0.3 %, P = 0.02 %, S = 0.002 % Cr from 10 % to 13 %, C = 0.02 wt%, Si from 0.1 % to = 0.3 wt%, Ni from 5 % to ...
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JP3460608B2 |
To economically produce a seamless steel tube while suppressing an inner face flaw in piercing by specifying the diameter of a billet containing a specified ratio of Cr and conducting Mannesman piercing at least at a specified temp. and ...
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JP3458485B2 |
PURPOSE: To provide a manufacturing method of a seamless steel pipe of excellent performance at high productivity with inexpensive equipment and manufacturing equipment train therefor. CONSTITUTION: A round billet is directly manufacture...
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JP3452039B2 |
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide the method for r...
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JP3444262B2 |
To solve such a problem that the out-of-roundness of a steel tube is degraded when unfilling that noncontact part with a grooved roll in the stand before the final one is produced in a part of the outside surface of the steel tube at siz...
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JP3425718B2 |
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...
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JP2003181506A |
To provide a rolling method for an Assel mill which prevents cracked flaws generated in a wall thickness cross section of a steel pipe.In Assel mill rolling to prevent internal flaws generated in the thick wall cross section of the steel...
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JP3411704B2 |
PURPOSE: To change a plug at the stage when the life of the plug is expired without monitoring the damaged state by measuring the surface temp. at the tip of the plug after rolling and before cooling and changing the plug at the point of...
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JP3407704B2 |
To prevent a generation of defects on the inside surface without lowering productivity even when a seamless steel tube consisting of high carbon steel is manufactured. This method is provided for manufacturing the high carbon steel seaml...
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JP2003136131A |
To provide a method for manufacturing a hollow member provided with a solid-core portion in an end side capable of manufacturing the hollow member with a good yield and a less deflected thickness.An inner face regulating tool 2 is insert...
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JP3405265B2 |
To secure workability and to prevent the generation of internal flaws at the time of executing Mannesmann piercing of high carbon steel. A billet which is made by continuously casting the high-carbon steel containing, by weight, 0.60 to ...
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JP3402988B2 |
To suppress incorrect follow-up of a cam follower with respect to a tubular cam while enhancing durability through a simple structure by constructing means for urging one cam follower toward the tubular cam side of a leaf spring. Under a...
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JP3402268B2 |
To perform a stable pierce rolling by adjusting a disc roll slanting angle in a way that an outer diameter of a hollow pipe coincides with a target value while installing a disc roll slantable against a pass line and movable in a pass li...
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JP3401434B2 |
To prevent the inner face of a tube to be rolled from generating a crack by making a Q value and T. Red a specific value so that tensile stress generated at a Pilger rolling time is crossed to metal fibers by using a base tube is which t...
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JP3400272B2 |
To prevent generation of defects such as crack in the end part of a tube stock and the like due to δ ferrite at the time of piercing rolling of cast billet for seamless tube with a piercer by rolling billet under satisfying specified co...
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JP3402175B2 |
To enlarge the possible manufactural length of a seamless steel tube. In the boring method of the seamless steel tube by an inclined roll, a boring plug 2 is arranged so that the maximum diameter part 2a is positioned in a gorge part 1b ...
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JP2003112208A |
To provide a device and method for rolling a steel tube which are excellent in not only tube polishing but also tube expanding capability without slowing down rolling speed than that in the conventional manner.In the rolling device for t...
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JP3367746B2 |
A two-high cross rolling mill with driven rolls situated one above the other and a pair of rotatably driven guide disks which are supported in rockers which are swivelable around vertical axles and can be adjusted transversely to the swi...
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JP3369241B2 |
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