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JP2586246 |
PURPOSE: To restrain indentation flaws by inside scales of a hot seamless tube manufactured by piercing and strech-rolling. CONSTITUTION: The inside temperature of the material which is being elongated by rolling is restrained below the ...
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JP2586274 |
PURPOSE: To prevent fouling and stripe-like flaws that are generated at the time of manufacturing a seamless steel tube from a stainless steel by making the thickness of a scale layer which is stuck to the outer surface of a solid billet...
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JP08309408 |
PURPOSE: To manufacture a seamless pipe made of a high alloyed steel, etc., with high rolling efficiency. CONSTITUTION: A billet made of an alloyed steel containing Cr or Ni with at least 5wt.% or over or an alloy whose main components a...
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JP08300013 |
PURPOSE: To stably operate a mill and to improve yield by stably executing bar stripping of a mandrel mill. CONSTITUTION: The bar retained force in rolling is measured at only the final stand of the mandrel mill 4 and also 3μp(SB--SF)+F...
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JP08294712 |
PURPOSE: To provide a piercing rolling mill which can execute piercing rolling of a tube stock having large thickness/outside diameter ratio without incurring generation of tail shrink, erosion of plug tip part and deformation of a mandr...
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JP2580098 |
PURPOSE: To manufacture a high-accuracy bar by executing the skew rolling of a rolled stock by revolving rolls in accordance with a ring having tapered parts on the inside peripheral surface. CONSTITUTION: A rolling device for a bar and ...
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JP08281311 |
PURPOSE: To extend the change range of the outlet-side diameter without deteriorate thickness deviation by arranging fixed type guide shoes facing to each other across the pass line by dividing them on the inlet side and the outlet side ...
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JP2572188 |
PURPOSE: To provide a piercing rolling method for a seamless steel tube by which even hard-to-work material can be efficiently piercing rolled at a low cost. CONSTITUTION: In a method by which the seamless steel tube is piercing rolled u...
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JP08257609 |
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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JP08257610 |
To improve safety and productivity and to make constitution of device compact by closing four directions of rotors of assel mill type rolling device for executing skew rolling of tube- and bar-shaped rolling stock and supporting rotors f...
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JP2561404 |
PURPOSE: To provide a skew rolling mill for a shafting with which stable rolling can be executed even when elongating rolls are worn, the adjustment of rolling reduction can be easily executed, the difference between circumferential spee...
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JP08232018 |
PURPOSE: To obtain rolling conditions capable of preventing the occurrence of cracks and flaws by specifying strain at the time of forming a high Cr ferritic steel of specific composition into a stock for seamless steel tube under specif...
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JP08229606 |
PURPOSE: To provide a method for rolling a seamless steel tube of a high Cr ferritic steel pipe containing Mo, W and having high creep strength. CONSTITUTION: In rolling of a seamless steel tube made of high Cr ferritic steel contg. Mo, ...
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JP08215715 |
PURPOSE: To execute skew rolling of a metallic tube stably and at high efficiency. CONSTITUTION: A skew rolling device 13 has an inclined-angle imparting motor 26 for imparting an inclined angle β to forming rolls 20, roll-driving torqu...
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JP08215716 |
PURPOSE: To provide a plug material excellent in erosion resistance and crack resistance for obtaining stably and efficiently the excellent quality of a product pipe in the manufacture of a high alloy seamless steel pipe, and to provide ...
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JP08215714 |
PURPOSE: To prevent the generation of flaws on the outside of a shell due to miss roll and burning, to improve production efficiency and to extend performable range even when the thin-walled hollow shell is rolled at high expansion ratio...
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JP08206707 |
PURPOSE: To secure the internal quality of products with a mandrel mill by executing one pass of elongating/rolling in a one stand mill consisting of four rolls. CONSTITUTION: This mill consists of a pair of upper and lower rolls 1 and a...
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JP08209245 |
PURPOSE: To obtain a seamless steel pipe excellent in cold workability at a low cost by reheating a pipe stock constituted of an austenitic stainless steel in which the content of C is regulated, subjecting the same to hot rolling at a s...
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JP08206711 |
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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JP08206710 |
PURPOSE: To more effectively prolong the life of a plug by optimizing the coating quantity of a lubricant on the surface of the plug in accordance with rolling conditions. CONSTITUTION: As for the coating quantity of the lubricant on the...
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JP08197114 |
PURPOSE: To secure a state lubricated with fluid so that the scale on the surface of a plug can be protected on the surface of the plug and to prolong the life of the plug by applying a lubricant consisting of a water-glass base water so...
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JP08197113 |
PURPOSE: To prolong the life of a plug by applying a water-glass base lubricant whose viscosity is specified at a specified temp. on the surface of the plug. CONSTITUTION: When the plug 12 is situated in front of lubricant applying heade...
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JP2543283 |
PURPOSE: To provide the process for production of the thin electric resistance welded steel pipe having the excellent roundness at the end of a small steel pipe. CONSTITUTION: Rolls are divided by ≥4 and the roll diameters are equaled ...
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JP08174013 |
PURPOSE: To obtain a hollow tube stock minimized in eccentric spiral thickness deviation by specifying the relationship between the diameter of a hollow billet and the interval between inclined rolls at the time of obtaining the hollow t...
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JP08174051 |
PURPOSE: To greatly decrease the voids from a joint boundary by cold drawing a blank in the state of coupling the mouth drawing part of an outside pipe and the mouth drawing part of an inside pipe, then sufficiently soaking and heating t...
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JP08155505 |
PURPOSE: To avoid the increase in the working degree in the two roll stand rows, and to reduce the bar changing work and the cost by changing the wall thickness as large as the wall thickness change of a finished tube on the stock tube s...
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JP2526447 |
PURPOSE: To offer a planetary reeler for improving the shape of inside surface and accuracy of thickness of tube which is rolled with a rolling mill of mandrel mill. CONSTITUTION: The planetary reeler A is arranged on the downstream side...
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JP08117819 |
PURPOSE: To enable the secure improvement of the life of a plug by applying lubricant made from water glass solution after a water film on the surface of the plug vaporized. CONSTITUTION: In an inclined rolling mill, rolling rolls are ar...
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JP08117817 |
PURPOSE: To easily prolong the life of a tool for a hot working, such as a plug for rolling a seamless steel pipe to be used under a severe condition like the rolling of a high alloy steel. CONSTITUTION: In the inclined rolling method fo...
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JP08117818 |
PURPOSE: To improve the life of a plug by applying lubricant on the whole surface of a plug before a rolling stock is rolled. CONSTITUTION: In an inclined rolling mill 10, piercing is performed with upper and lower rolling rolls 11 arran...
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JP08117814 |
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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JP08117815 |
PURPOSE: To improve the durability of a piercing plug in manufacture of a seamless steel pipe and to prolong its life. CONSTITUTION: A hollow base stock is made by hot piercing a billet consisting of alloy steel with the piercing plug an...
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JP08103808 |
PURPOSE: To provide the easy, safe and precise aligning method. CONSTITUTION: In the aligning method of rolling mill which executes measurement from the reference face of a housing 1 by use of a jig 14, while the jig 14 is placed between...
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JP08090258 |
PURPOSE: To prevent the cracking of the outer shell and the generation of the defective joining by heating an outer tube immediately before achieving the incline rolling so as to be higher in temperature compared with an inner tube by an...
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JP08090013 |
PURPOSE: To simplify a roll elevating/lowering mechanism and to contrive the space-saving and improved rigidity of the main body of a forming-roll supporting machine by rotating forming rolls having high cross angles in the converging di...
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JP08066703 |
To reduce an outer diameter or a wall thickness by rolling a cylindrical hollow body, which is fed into an Assel mill from a front part, by approaching a prereducer roll to the hollow body at a specified adjusting speed to be slowly and ...
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JP08066704 |
To provide a method for diagonal piercing rolling which is capable of averting the incorrect rolling and working hindrance of thick or thin tube stocks of an about middle extent and a diagonal piecing roll stand for this purpose. This ma...
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JP08057533 |
PURPOSE: To provide a clad bar, which has a proper thin diffusion layer in its joined part, and a manufacture thereof. CONSTITUTION: First, descaling is performed on the inner surface of a titan pipe and the outer surface of a copper rou...
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JP08052555 |
PURPOSE: To provide a continuously cast billet for seamless stainless steel pipe base stock, by which an inner surface flaw of the pipe does not develop at the time of pierce-rolling, by shifting the internal gap developed at the last so...
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JP08047738 |
PURPOSE: To make it possible to apply a rolling process to semiprocessed products having a shoulder part or a stepped part which is annularly protruding as well by performing each rolling process in a transversing direction to the semipr...
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JP08039119 |
PURPOSE: To enable control so as to obtain a target pipe outside diameter by determining the set change rate of a pipe surface temp. in accordance with specific equation from the error in the outside diameter of the pipe calculated from ...
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JP08039106 |
PURPOSE: To suppress the variation of the outside diameter of tube in the logitudinal direction after rolling in high-expansion rolling with an skew rolling mill by rolling a tube lowering the rolling temp. in the tip part of a material ...
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JP08024929 |
PURPOSE: To provide a rolling control method of a reeler capable of providing a tube of uniform length after passing a sizer. CONSTITUTION: A control device 7 obtains the mean wall thickness of a hollow shell H on the outlet side of a pl...
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JP08025063 |
PURPOSE: To provide a process for producing a different material pipe joint of a large diameter having excellent joinability and joint strength. CONSTITUTION: A cylindrical intermediate layer material 12 consisting of a zirconium materia...
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JP08024911 |
PURPOSE: To improve condition of the inner surface of a tube in an expansion rolling device, by providing the tip end of a pusher with a port for jetting water for the purpose of descaling the inner surface of a hollow tube stock and/or ...
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JP08024910 |
PURPOSE: To enable miniaturization of installation area, to reduce heating tem perature for compensating temperature drop of a rolling stock and to supress generation of flaws inside and outside a tube, in an inclined rolling device in w...
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JP08024912 |
PURPOSE: To enable a high expansion rolling with a high roundness by making the radius of curvature a single value around the pass line on the shoe face of a guide shoe at each position in the direction along the pass line of the guide s...
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JP08001211 |
PURPOSE: To continuously execute uniform lubrication by gradually feeding a grease-like lubricant between the inside surface of tube stock and a plug during reeling and rolling a tube, to drastically increase the number of tubes rolled u...
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JP08001210 |
PURPOSE: To manufacture a seamless tube without the occurrence of a defect even in the case of a high expansion ratio. CONSTITUTION: A billet B is fed in the axial length direction, is rotated helically and is moved by the rotations of b...
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JP07328707 |
PURPOSE: To support the outside diameter of a hollow shell by fastening support rolls to an interval where the hollow shell is not pressed and not held after the end part of hollow shell is passed through the support rolls. CONSTITUTION:...
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