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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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JP07314014 |
PURPOSE: To provide equipment and a method for rolling a seamless tube and for drastically improving the precision of the inside surface. CONSTITUTION: In the equipment for rolling a seamless tube for obtaining a prescribed outside diame...
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JP07314015 |
PURPOSE: To drastically improve the precision of the inside surface and also to unnecessitate a plug mill and reeler or a mandrel mill to be arranged in front of a forming mill. CONSTITUTION: The forming mill 1 with which the various siz...
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JP07308703 |
PURPOSE: To reduce internal scab generated at the time of rolling martensitic stainless steel or duplex stainless steel with an elongator. CONSTITUTION: When a tube stock 4 made of martensitic stainless steel (or duplex stainless steel) ...
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JP07303906 |
PURPOSE: To enable rolling at different tube expanding rate with out changing a guide shoe and with a same-shaped shoe by inclining the shoe to the rolling direction of the tube in accordance with the target tube expanding rate. CONSTITU...
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JP07303907 |
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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JP07303905 |
PURPOSE: To execute highly expanding/rolling without hindering yield and productivity by satisfying an equation which shows that there is the optimum range in the relationship between the ratio of a roll diameter and the outside diameter...
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JP07284817 |
PURPOSE: To prevent seizure flaws or the like caused by the burning on the surface of a guide shoe and to improve the quality by rolling a material to be rolled while supplying the aq. solution of swelling mica at least one place between...
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JP07284818 |
PURPOSE: To prevent the generation of internal surface flaws by measuring the advancing speed of a material to be rolled or the axial load of plug and adjusting the supply of an antislipping agent based on the increase and decrease of th...
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JP07275912 |
PURPOSE: To prevent the generation of bad biting, bad running-out and the rupture of hollow by satisfying a specified relation by the wall thickness on the inlet side of a hollow tube stock of a material to be rolled, wall thickness of t...
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JP07275908 |
PURPOSE: To correct the thickness deviation of a tube stock after rolling by making the outside surface on the backside of a plug into a reeling part which is composed of a concave hyperboloid of revolution and making the distribution in...
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JP07275913 |
PURPOSE: To prevent the generation of bad biting, bad running-out and the rupture of hollow by satisfying a specified relation by the wall thickness on the inlet side of hollow tube stock of a material to be rolled, wall thickness on the...
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JP07275954 |
PURPOSE: To prevent the development of a linear flaw on the surface of a steel tube by making a hoop steel after bending almost the triangular steel tube constituted with three large arcs and three small arcs, in the mechanism for formin...
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JP07265910 |
PURPOSE: To suppress generation of spiral uneven thickness as well as shear deformation by reversing a rotating direction of the stock to be rolled of one or more skew rolling processes against a rotating direction of the stock to be rol...
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JP07256328 |
PURPOSE: To suppress generation of the shoe marks occurring caused by seizure of guide shoes in piercing in seamless pipe production. CONSTITUTION: This method for lubricating outside surfaces in seamless pipe production comprises pierci...
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JP07246403 |
PURPOSE: To change the outside diameter of tube into an arbitrary size in a manufacturing line without generating the torsion and bend on the metallic tube. CONSTITUTION: Planetary type stretch reducers 3a, 3b, 3c in which plural rolling...
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JP07241609 |
PURPOSE: To suppress the variation in the longitudinal direction of the outside diameter of a tube after rolling by making the rotational speed of disk guide shoes during rolling the tip of a material to be rolled faster than the rotatio...
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JP07241606 |
PURPOSE: To suppress the variation of the outside diameter of tube in the longitu dinal direction after rolling by making the lead angles of rolling rolls during rolling the tip part of a material to be rolled smaller than the lead angle...
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JP07241608 |
PURPOSE: To suppress the variation in the longitudinal direction of the outside diameter of tube after rolling by making the rotational speed of rolling rolls during rolling the tip of a material to be rolled faster than the rotational s...
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JP07241607 |
PURPOSE: To improve the accuracy of external size of tube by setting the temp. of a tube stock on the inlet side of an expansion mill, also determining the actual temp. of the tube stock on the inlet side of this expansion mill, changing...
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JP07227604 |
PURPOSE: To manufacture a high Cr seamless steel pipe of high quality by supplying a ferrous oxide setting an iron oxide as a main component on a plug surface for punch from a billet side. CONSTITUTION: A hollow base stock is adjusted by...
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JP07214112 |
PURPOSE: To prevent formation of annular or fin-like burrs at the rear end of a base pipe in production of the base pipe for production of a steel pipe by piercing of a pipe material billet by a piercing plug and piercer roll. CONSTITUTI...
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JP07214114 |
PURPOSE: To improve the dimensional accuracy of tube at the time of rolling a thin large-diameter tube having small wall-thickness to outside diameter ratio and to avoid the fin flowing due to the flaring of a stock tube. CONSTITUTION: I...
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JP07214110 |
PURPOSE: To stably execute the stripping of a mandrel bar from a base pipe. CONSTITUTION: In a retractable mandrel mill whose mandrel mill 1 and sizer 4 are arranged in tandem at a distance shorter than the length of the drawn base pipe,...
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JP07214113 |
PURPOSE: To prevent formation of burrs at the rear end of a base pipe in production of the base pipe for production of a steel pipe by piercing of a pipe material billet by a piercing plug and piercer roll. CONSTITUTION: The rear end fac...
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JP07214115 |
PURPOSE: To execute high expansion rolling of tube by avoiding that a material to be rolled is fin flowed and broken from the clearance between a rolling roll and a guide shoe by the generation of flaring, and continuation of rolling is ...
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JP07204711 |
PURPOSE: To reduce frequency of exchanging a piercer bar cap, manpower and cost by preventing wear of the abutting surface of core metal of a piercer bar cap of an assel mill. CONSTITUTION: In the piercer bar cap 1 provided with a column...
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JP07185610 |
PURPOSE: To reform an existing mandrel mill line at low cost and to produce product pipes of larger outside diameters by composing rolling equipment for seamless pipes of a Mannesmann inclined piercer, a mandrel mill, a incline type expa...
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JP07185607 |
PURPOSE: To produce product pipes of a wide range of outside diameters from a continuously cast hollow pipe stock at low cost. CONSTITUTION: This rolling equipment train for seamless pipes is provided with an expansion rolling line for f...
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JP07185609 |
PURPOSE: To reform an existing mandrel mill line at low cost and to produce product pipes of larger outside diameters by composing rolling equipment for seamless pipes of a Mannesmann inclined piercer, a mandrel mill, a reheating furnace...
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JP07185606 |
PURPOSE: To provide guide shoes with guidability equal to the guidability of stationary type guide shoes and to permit rapid replacement of guide shoes by fixing respectively one piece among the plural guide shoes on a pair of base bodie...
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JP07171606 |
PURPOSE: To evade the defective biting, defective running-out of a material to be rolled and the breakage of a hollow by flaring, to increase the degree of freedom in rolling setting and to enable highly expanding/rolling a tube without ...
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JP07164021 |
PURPOSE: To improve a peeling limit, and to reduce the generation factor of a guide shoe mark by that the projection of a piercing shell between a main roll and a guide shoe, becomes less. CONSTITUTION: When piercing a seamless steel pip...
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JP07164020 |
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast bill...
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JP07164022 |
PURPOSE: To prevent an increase in a gap caused by the deformation and the shifting of a disk roll during rolling. CONSTITUTION: Disk rolls 2U and 2D are arranged opposite to each other in the vertical direction on both sides of a pass c...
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JP07164023 |
PURPOSE: To attain a forming condition free from the generation of a roll mark by finding the generation limit line of the roll mark according to the ovalities of three roll stands, and limiting the ovalities of two roll stands and a dra...
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JP07155808 |
PURPOSE: To prevent generation of torsion in a material to be rolled and additive shearing strain in a section even at the time of rolling high alloy steel such as stainless steel and to prevent generation of failure of biting, defective...
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