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JP3021664B2 |
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JP3017593B2 |
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JP3006486B2 |
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JP3006942B2 |
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JP3004875B2 |
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JP3003553B2 |
To provide a high expansion ratio piercing method without generating inside grazing caused by a plug. After setting setup so that the inner peripheral length of a hollow tube stock is larger than the outer peripheral length in the max. d...
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JP2000024705A |
To provide a manufacturing method of a seamless steel tube by a plug mill tube-making line by which the generation of a carburized layer on the inside surface is suppressible and seamless alloy steel tube excellent in corrosion resistanc...
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JP2000024704A |
To prevent the generation of flaws on an outer peripheral surface of a tube body even in cold-rolling the tube body made of not limited to ordinary steel but high alloy steel by replacing lower shoes of guide shoes for a reeler in the pr...
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JP2000024703A |
To prevent the generation of flaws on outer peripheral surface of a tube body even in case of cold-rolling the tube body made of not limited to ordinary steel but high alloy steel by executing the grinding of the tube body and shape corr...
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JP2000024706A |
To provide a manufacturing method of a seamless steel tube by a mandrel mill tube-making line by which the generation of carburized layer on the inside surface is prevented even when a mandrel bar to which graphite is stuck is used and s...
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JP2998605B2 |
To obtain a piercing device in which the tip of a plug is prevented from eroding by using an analysis model in a piercing method of a seamless metallic tube. In a piercing device, the temp., which is measured with a temp. measuring devic...
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JP2998395B2 |
PURPOSE: To prevent the bottom of a tube from being cut off without generating inside scratches and blocking the bottom, improve the rolling efficiency and carry out high quality of rolling. CONSTITUTION: The terminal of a tube material ...
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JP2000000605A |
To manufacture a pipe without causing cost increase even for a hardly workable material or the like and without remaining a flaw on the pipe inner face by obliquely piercing and rolling a round cast metal as casting by using a plug and p...
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JP2996124B2 |
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JP2994159B2 |
PURPOSE: To improve the roundness without changing rolls at an arbitrary external diameter by rotating and revolving plural recessed rolls having a radius larger than a pipe radius each. CONSTITUTION: Plural inclinable recessed rolls hav...
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JP2994202B2 |
PURPOSE: To manufacture a steel tube having high roundness over the entire length by dividing sizer rolls of the final stand into four in the circumferential direction of pipe and executing drawing by changing the ratio of the base diame...
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JP2996077B2 |
A method for manufacturing seamless steel tubes by the Mannnesmann tube making process wherein a billet is passed through a piercer and the center of the billet is pierced through to obtain a hollow shell. A pair of disk rolls are dispos...
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JP2991851B2 |
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JP2991087B2 |
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JP2976831B2 |
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JP2976858B2 |
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JP2972966B2 |
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JP2973885B2 |
To obtain a method for drawing, reducing and sizing a seamless metallic tube by which defective bar stripping is not generated even when drawing, reducing and sizing are executed, by using a size capable of interstand tension imparting r...
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JPH11277110A |
To manufacture various kinds of square pipes with the same forming rolls by canceling rotational force in the circumferential direction which is the cause of twist which is liable to generate on pipe stocks by the inclination of forming ...
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JP2932958B2 |
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JP2921783B2 |
A method for manufacturing a delayed hydride cracking resistant zirconium ahoy (Zircaloy-2, Zircaloy-4, Zr-2.5% Nb, pure Zr, etc.) pressure tube includes the steps of making a seamless pressure tube having a diameter smaller than the fin...
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JPH11188408A |
To stably manufacture electric-resistance-welded steel pipes with superior roundness without reducing the manufacturing efficiency with necessary minimum rolls by reducing the weld zone with horizontal rolls immediately after heating/sof...
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JPH11169914A |
To prevent the generation of internal carbunization and also to improve the quality of the inside surface by regulating the temp. of the inside of a material to be pierced just before rolling with the 2nd piercer (elongator) within a ran...
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JP2913115B2 |
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JP2900795B2 |
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JP2898775B2 |
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JP2900804B2 |
A seamless steel tubular product is produced by hot-piercing an alloy-steel billet with a piercing plug to produce a hollow shell and then rolling the hollow shell. Prior to the hot-piercing, a steel sheet is joined to an end surface of ...
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JP2884321B2 |
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JP2880991B1 |
[wrap up] [Task] Provided is a drilling device capable of improving the plug life and the inner surface quality of the material to be drilled in the drilling process of a metal long column. The plug has a truncated cone that shares an ax...
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JP2880385B2 |
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JP2864397B2 |
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JPH1157842A |
To obtain a method of manufacturing a steel pipe; wherein a special adjustment of measurements of the pipe is substantially not required for a final cold finishing working, and compressive strength in the direction of the pipe's length i...
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JPH1150148A |
To obtain a steel pipe with high strength and high corrosion resistance by subjecting a steel having a specified componental compsn. to steel pipe forming and direct quenching under specified conditions and refining it to required streng...
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JP2857312B2 |
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JP2844924B2 |
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JP2831865B2 |
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JP2827129B2 |
An improved method of making a cross joint between different size pipes is provided. A punch, die and a pressing machine are prepared. The punch includes a center rest for receiving a small pipe, a curved slot and a curved surface for tr...
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JP2815749B2 |
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JPH10249409A |
To manufacture plural kinds of metallic tube with spiral projections having different wall-thickness without changing rolling rolls. In this manufacturing method, a solid metallic bar or metallic tube of hot pierced or stretched with a s...
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JP2580519Y2 |
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JPH10235413A |
To provide a method and device for manufacturing a seamless steel tube by which the life of a plug used for piercing is drastically prolonged. In the manufacturing method of the seamless steel tube including hot piercing stage, at the ti...
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JPH10235422A |
To effectively improve the bar-stripping property even when the coefficient of friction between a mandrel bar and a shell is varied by changing the properties of the surface of the mandrel bar. Tension which acts on the shell A between m...
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JP2775029B2 |
To provide a device for executing skew rolling of tube-shaped or bar-shaped rolling stock. In order to feed a rolling stock, a roll 2, whose roll axis 4 is, seen in the direction of longitudinal axis 3 of the rolling stock, inclined to t...
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JPH10180315A |
To obtain a plug with much more improved life time than in the conventional are under a severe condition of being constantly exposed to high temperature and high load by changing a part of plug located at the outermost surface of plug wi...
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JPH10180314A |
To roll a hard-to-work tube stock such as a Ni-base alloy tube without generating cracks on the inside surface. This rolling method is composed so that the tube stock is drawn while imparting tensile force to the tube stock H from the fr...
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