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JP59080716 |
PURPOSE: To manufacture efficiently a long-sized two-phase alloy pipe having a large diameter at a low cost by properly setting the heating temp. of a two- phase alloy contg. Cr in relation to the amount of austenite, and manufacturing a...
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JP59078705 |
PURPOSE: To prevent surely the generation of a sticker phenomenon in the stage of pushing a blank material into a piercing mill for producing a seamless steel pipe by applying beforehand rotation to the blank material. CONSTITUTION: A bl...
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JP59076602 |
PURPOSE: To improve dimensional accuracy in the stage of piercing a blank material with a skew roll piercer and producing a hollow blank pipe by measuring the size and shape prior to piercing of a plug to be used for piercing at every pi...
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JP59076608 |
PURPOSE: To control highly accurately a shape of pipe rolled by a reeler, by adjusting a torque difference between motors for driving both rolls by field adjusting relatively roll driving motors for driving rolls respectively to adjust t...
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JP59076609 |
PURPOSE: To make the wall thickness and roundness of a product highly accurate, by providing a tension detector to a mandrel bar, and keeping a tension of mandrel bar constant by changing the rotating speed of barrel-shaped rolls in acco...
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JP59070424 |
PURPOSE: To obtain a sure biting detection signal of a tube material in piercing a tube material by a barrel-shaped roll and a plug at the tip of a mandrel bar by detecting compressive force acting on the mandrel bar. CONSTITUTION: A man...
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JP59056907 |
PURPOSE: To enable production of a titled pipe with good productivity by forming ruggedness on the surface of a rolling roll during rolling or no-load operation by means of a blade provided in a roll housing of a skew rolling mill and a ...
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JP59054404 |
PURPOSE: To prevent the defective biting of a blank material and the formation of the defective inside surface of a blank pipe by specifying the ratio of the distance from the position where the blank material is bit between rolls up to ...
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JP59054410 |
PURPOSE: To roll a blank pipe in a steady state, and to equalize the torques of respective motors, by controlling a field system so that the magnetic flux density of a roll driving motor at the pipe feeding side is larger than that of a ...
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JP59050906 |
PURPOSE: To prevent he generation sticker phenomenon by calculating beforehand the axial speed of a blank material when the fiting to main rolls is completed and determining the axial speed of the blank material as the upper limit of the...
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JP59039407 |
PURPOSE: To pierce the central part of a billet with the guide of a cooled outside peripheral part and to improve yield by jetting a cooling fluid to the outside circumference on the rear end of the billet which is held heated to cool th...
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JP59035813 |
PURPOSE: To perform smoothly a rolling of a material of thin wall thickness, by forming the shape of a skew roll so that the gap between a disk guide roll and the skew roll becomes zero at the over filling side. CONSTITUTION: In a skew r...
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JP59033011 |
PURPOSE: To prevent the formation of oxide scale on the inside surface of a hollow blank material in the stage of piercing a blank billet by means of inclined rolls and a plug by supplying an inert gas to the pierced hollow part. CONSTIT...
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JP59033010 |
PURPOSE: To provide a titled device which avoids the formation of surface roughening on the inside surface of a seamless steel pipe product by the constitution wherein an inert gas introduced into a plug bar from the root end part thereo...
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JP59007407 |
PURPOSE: To improve hot online the dimensional accuracy of a seamless steel pipe by determining the helix angle in the axial direction of a thickness deviation from the fluctuation in the wall thickness of a blank pipe detected during ho...
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JP59007425 |
PURPOSE: To detect an influence degree on a torsion angle and deflected thickness at a practical accuracy level when searching a factor of generation of deflected thickness, by evaluating in advance a torsion angle being a factor of gene...
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JP59004909 |
PURPOSE: To push a billet into main rolls for biting it in good conditions, by controlling the driving current of a DC motor of a pusher used for billet in accordance with the changes of length, temperature, and material of the billet, i...
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JP59004905 |
PURPOSE: To enable the production of a thick walled hollow bar material having excellent out of roundness without using any tool such as plug or mandrel by drilling the round bar steel material along the central axis thereof, and drawing...
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JP59001007 |
PURPOSE: To provide a titled conical roll made capable of preventing the generation of spiral mark of a material to be rolled, by forming the connecting part of a rolling zone and a correcting zone of a conical roll into a smoothly curve...
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JP59001008 |
PURPOSE: To provide a titled device made capable of exchanging a disk guide safely and quickly, by constructing the device to put a disk guide pulled out to the outside together with a journal box on a disk-guide bearer, and to lower it ...
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JP58221605 |
PURPOSE: To provide a titled rolling mill which decreases the rolling force on a mandrel by making the angle of inclination, diameter and offset angle of circular conical rolls respectively small, and containing the ultimate range of the...
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JP58215209 |
PURPOSE: To extend considerably the life of a mandrel by moving the mandrel inserted into a rough pipe together with the rough pipe until the rolling work is finished thereby preventing the mandrel from receiving local overheating by rol...
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JP58204163 |
PURPOSE: To obtain the titled cast alloy with superior resistance to heat, wear and thermal shock, by restricting a composition consisting of elements such as C, Cr, Ni, Co, Ti, Al, W, Mo and Fe. CONSTITUTION: This cast alloy with superi...
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JP58184004 |
PURPOSE: To enable desired adjustment of a feed angle by fitting a rotary housing and an inner housing freely rotatably into a stationary housing and rotating these housings in one body. CONSTITUTION: A cylindrical stationary housing 1 i...
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JP58181411 |
PURPOSE: To detect accurately the melting-down of a plug, by measuring a motor current at the time when a shell is separated by retreating a thrust block, and comparing the current with a motor current in a normal state. CONSTITUTION: Wh...
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JP58168414 |
PURPOSE: To reduce the thickening of wall thickness at the top part of a pipe, and to improve product yield, by feeding back the data of wall thickness at the top part of a pipe stayed in a cold state, and using the data as the roll gap ...
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JP58168405 |
PURPOSE: To improve the inside surface shape of a metallic pipe and to improve the durability of a plug in the stage of producing the metallic pipe by a Mannesmann double piercing system by injecting cooling water from the forward end of...
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JP58168404 |
PURPOSE: To prevent the generation of flaw on the inside surface of a metallic pipe owing to the friction and seizure between a mandrel and the inside surface of the metallic pipe by cooling the inside surface of the metallic pipe then c...
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JP58167004 |
PURPOSE: To produce a seamless pipe which has less surface defects such as chatter mark or the like easily by piercing, expanding or drawing a material to be rolled by using a plug which is split into plurality in the axial centerline di...
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JP58135708 |
PURPOSE: To produce a hollow bloom for steamless steel pipe continuously and efficiently with simple stage at a low cost by subjecting the continuously case bloom to bloom piercing in succession to the continuous casting while keeping th...
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JP58132310 |
PURPOSE: To improve rolling accuracy by correcting the influences of the thermal expansion and abrasion of rolling rolls and plugs. CONSTITUTION: Target wall thickness value T, target elongating length l, and target diameter value D of p...
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JP58128205 |
PURPOSE: To determine rolling reduction force easily without the need for examining the points where centrifugal forces and rolling forces act by providing detecting elements for rolling force in a roll head in such a way that the reacti...
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JP58119416 |
PURPOSE: To make easily and surely the wall thickness distribution in the longitudinal direction of a seamless pipe uniform by controlling a piercer, by obtaining the target wall thickness distribution in the longitudinal direction of a ...
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JP58116917 |
PURPOSE: To make thickness distribution in longitudinal direction of a seamless pipe after elongation surely uniform by controlling a piercer from bulge width distribution in longitudinal direction of a mandrel mill that elongates a holl...
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JP58107205 |
PURPOSE: To obtain a seamless pipe of high alloy steel having good inside surface characteristics by using a hollow blank material, packing an inert gas in the hollow part thereof, and heating the material with said gas then subjecting t...
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JP58103904 |
PURPOSE: To make work safer, quicker and more efficient by exchanging piercer rolls only by the operation of a dolly without attaching and detaching caps. CONSTITUTION: Spindles connecting upper, lower piercer rolls 6, 11 and a driving d...
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JP58103902 |
PURPOSE: To form increased metal parts of good quality in a part of a tubular body with high productivity by rolling a hollow blank material while changing the rolling gaps between the plural rolling rolls which are obliquely disposed at...
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JP58097409 |
PURPOSE: To remarkably reduce the generation of the wall thickness deviation of a seamless steel pipe, by rolling said pipe at a rolling speed kept away from the inherent frequency of a mandrel bar, in rolling a seamless pipe by a skew r...
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JP58086910 |
PURPOSE: To roll a pipe having thin wall thickness, enhancing the forwarding efficiency of a shell, preventing the generation of surface flaw, and reducing the fluctuations of dimensions, by using a belt so that it functions as a guide s...
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JP58070905 |
PURPOSE: To expand pipes at a large expanding rate in the stage of expanding rolling of metallic pipes by skew rolling mills by applying axial pushing forces to the pipe from the inlet side of the rolling mills. CONSTITUTION: A blank pip...
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JP58070904 |
PURPOSE: To upset pipes to desired outside diameters and wall hicknesses by controlling the advancing speed components of peripheral speeds of rolls, mandrel speeds and rolling reduction. CONSTITUTION: A pipe P is rolled down and rotated...
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JP58068409 |
PURPOSE: To prevent material flaws and to prolong the service life of a guide shoe, by supplying a lubricant to the space between the guide shoe and the material in piercing the radially expanding rolling, etc. of the material held by th...
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JP58055108 |
PURPOSE: To produce seamless pipes with large diameter having end faces of good shapes inexpensively in high yields by hot rolling a cylindrical blank material by using a roller contacting with the outside circumferential surface thereof...
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JP58045319 |
PURPOSE: To elevate oxidation resistance to high temperature steam in a steel pipe whose blank material is steel containing Cr, by moving a plug in its axial lengthwise direction, executing squeeze-working to the inside surface of the st...
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JP58044937 |
PURPOSE: To perform cupping simply by single process by providing a pair of left and right columns, a guide and a shifting frame and simplifying charging of material, taking out of products and recharging of material. CONSTITUTION: The d...
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JP58035005 |
PURPOSE: To prevent the formation of scale and to decrease flaws on the inside surface of a pipe by creation of a nonoxidative atmosphere in the pierced hole in the stage of piercing the pipe by injecting the inert gas conducted through ...
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JP58025809 |
PURPOSE: To prevent unequalization of the wall thickness distribution in the longitudinal direction of a hollow pipe after being rolled, by canceling a real advancing motion caused by the thermal expansion of a plug bar piercing or reduc...
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JP58016717 |
PURPOSE: To replace a roll quickly and automatically without using an overhead traveling crane, by rotating a housing of a 3-roll axle mill, so that 3 rolls can be carried out and carried in by a rail. CONSTITUTION: A spindle 22 of each ...
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JP58016711 |
PURPOSE: To prevent flaring in the trailing end part of steel pipes and the fluctuations in their wall thickness by providing roll screw-down mechanisms to the stationary housing and rotary housing of a rolling mill in the positions faci...
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JP58016710 |
PURPOSE: To facilitate centering owing to the change in the size of billets by providing a hollow cylindrical inlet guide enough to cover roughly the length of the billets on the inlet side of rolling mills and an easy down mechanism whi...
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