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Matches 501 - 550 out of 1,579

Document Document Title
JP3021664B2  
JP3017593B2  
JP3006486B2  
JP3006942B2  
JP3004875B2  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
JP2996124B2  
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...  
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...  
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...  
JP2991851B2  
JP2991087B2  
JP2976831B2  
JP2976858B2  
JP2972966B2  
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...  
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 ...  
JP2932958B2  
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...  
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...  
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...  
JP2913115B2  
JP2900795B2  
JP2898775B2  
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 ...  
JP2884321B2  
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...  
JP2880385B2  
JP2864397B2  
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...  
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...  
JP2857312B2  
JP2844924B2  
JP2831865B2  
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...  
JP2815749B2  
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...  
JP2580519Y2  
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...  
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...  
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...  
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...  
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...  

Matches 501 - 550 out of 1,579