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JPS58103902A |
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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JPS5897409A |
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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JPS5876303U |
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JPS5876302U |
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JPS5870905A |
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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JPS5870904A |
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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JPS5868409A |
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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JPS5857301U |
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JPS5855108A |
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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JPS5844937A |
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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JPS5816710A |
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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JPS5816712A |
PURPOSE: To manufacture a large diameter seamless pipe which is excellent in its dimension accuracy, by constituting so that both end supporting parts being in the axial direction of a rolling roller can be drawn down independently, and ...
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JPS5816711A |
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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JPS5813407A |
PURPOSE: To prevent a mandrel from an occurrence of partial abrasion, by controlling the mandrel position in the circumferential direction so that the number of rollings of the mandrel surface opposing to a rolling roll is made uniform a...
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JPS583444B2 |
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JPS57199506A |
PURPOSE: To improve the roundness of the sectional shape of products by driving a pair of rolling rolls respectively independently, and controlling the rotating speeds of the respective rolling rolls in such a way that the central axial ...
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JPS57199507A |
To avoid internal faults in the manufacture of pipes, in particular on piercing or pilgering lines, the atmosphere present in the interior of a pipe ingot, which would otherwise bring about oxidation of the internal surface of the pipe, ...
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JPS57195525A |
PURPOSE: To make thickness of tubes constant by calculating the amount of drawing position control that makes the difference between calculated thickness in the outlet side of a rolling mill and target thickness in the outlet side zero, ...
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JPS57193218A |
PURPOSE: To make a tube mean thickness value at the delivery side of a sizing mill constant, by combining and controlling a roll screw-down position of a plug mill and a motor rotational frequency ratio of a sizing mill, in a Mannesmann ...
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JPS57190708A |
PURPOSE: To roll a blank pipe to decrease its wall thickness toward its outer end-part and to reduce its cut-off length, by inserting a mandrel into the inside of the end part of pipe and, bringing rolling rolls into rolling contact with...
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JPS57188619A |
PURPOSE: To evade duplication of facilities while facilitating the distribution of an as-rolled material and a material to be heat-treated, by providing quenching facilities successively to the entracne side of cooling facilities connect...
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JPS57177812A |
PURPOSE: To prevent a product from loweing the cylinderness, by rolling a cylindrical blank material while pressing the end surfaces of the material in the axial direction by using end-surface rolling rollers, in manufacturing the titled...
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JPS57177811A |
PURPOSE: To prevent a seamless pipe product from lowering the roundness, by expanding a cylindrical blank material by using a pair of rolls which are in contact with the material at its outer and inner circumferential surfaces, and hot r...
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JPS57175008A |
PURPOSE: To inexpensively manufacture a long-sized, large dia. and thin walled seamless pipe by a small rolling reduction, by rolling a raw material in the radially outward direction with inner circumference rolling rolls while rotating ...
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JPS57175009A |
PURPOSE: To prevent a product from the deformation of its cross sectional shape and to maintain the roundness of it, by forming a raw material in forced cooling by keeping the material pinched with rolls while rotating it, immediately be...
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JPS57165106A |
PURPOSE: To prevent the guide shoe flaws produced on the surface of a round steel material or a blank pipe which is a raw material in the stage of producing a seamless steel pipe by a Mannesmann process, by interposing mill scale between...
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JPS57155325A |
PURPOSE: To eliminate the need for quenching furnace or the like conventionally used and to make pipe production efficient by a method wherein reeling of a pipe is finished at a temperature directly above the Ar3 transformation point of ...
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JPS57152304U |
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JPS57149012A |
PURPOSE: To conform the ratio between the length of a blank material and a pipe material ao a desired value, by automatically controlling a roll gap and a guide-shoe gap by operating from respective measured values of the weight and leng...
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JPS5743341B2 |
The disclosure relates to apparatus for center punching a hot metal billet preparatory to a piercing operation, in the production of seamless tubing. The apparatus provides a simple, reliable, mechanical arrangement effective to automati...
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JPS57142709A |
PURPOSE: To manufacture a hollow shell and seamless pipe both having uniform wall thickness without causing defects, by changing a roll gap in accordance with a previously determined controlling-pattern, in a skew mill. CONSTITUTION: A c...
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JPS5741549B2 |
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JPS57142704A |
PURPOSE: To prevent the generation of spiral flaws and pit flaws and to improve the characteristic of inside surfaces considerably by tilting and controlling respective rolls around their centers thereby maintaining the size between the ...
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JPS57139409A |
PURPOSE: To prevent wall thickness deviation effectively, by rolling a part of blank pipe, where a generation of thin wall thickness is predicted while the blank pipe is passed through reeler, into a part having a wall thickness thicker ...
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JPS57139420A |
PURPOSE: To always obtain a uniform rolled product, by measuring an elapsed time in case when a steel pipe is being carried, and constituting so that a load condition in case of rolling is corrected in accordance with an estimated rollin...
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JPS57130707A |
PURPOSE: To obtain a long-sized pipe having no die line flaws and having dimensional stability by inserting a bottomed blank pipe onto a thrustable and rotatable mandrel and drawing the same with skew rolling rolls while giving reducing ...
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JPS57130706A |
PURPOSE: To obtain a long-sized pipe efficiently and easily by disposing plural Assel rolls around the axial line of a blank pipe inserted with a mandrel of a tapered shape and subjecting the pipe to Assel working in the direction of nar...
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JPS57122711U |
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JPS57115907A |
PURPOSE: To improve the dimensional accuracy by measuring the outer diameter and the extended length of blank pipes to be pierced at the outlet side, by successively measuring the most suitable set value of the outer diameter and the wal...
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JPS57116301U |
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JPS57112915A |
PURPOSE: To advance a metallic pipe and to process the outer and inner surfaces of the pipe by the rotating force of a rolling roll, by revolving the rolling roll, having inclined angles to the axial line of the pipe, around the outer ci...
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JPS57109505A |
PURPOSE: To exchange cannon guides safely in a short time by mounting and dismounting the cannon guides to and from a mill housing by means of the insertion and pulling off of pusher rods which are connectable and disconnectable to and f...
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JPS57106414A |
PURPOSE: To continuously manufacture plural steel pipes having same diam. and different wall thickness from one blank pipe, by changing setting of reduction for a hollow blank pipe on the way to obtain a shell having different wall thick...
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JPS57103715A |
PURPOSE: To treat both raw materials by a single line, by providing a "Adurol" material cooling apparatus and a heat treatment apparatus for a heat treating material, to be arranged parallelly, and adjusting a confluence of said material...
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JPS57100806A |
PURPOSE: To minimize the area occupied by installations by connecting respective rolling mills and equipment installations in series by the combination of axial feed and transverse feed and connecting conveyance paths at the shortest dis...
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JPS5794410A |
PURPOSE: To judge on line the generating source of thickness deviation of a seamless steel pipe, by measuring the change of rolling conditions continuously in rolling a pipe-material to analyze a wave form obtained from the measured resu...
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JPS5781911A |
PURPOSE: To obtain a steel pipe of the outside diameter conforming exactly to the target stably by forecasting such plug position pattern of a reeler mill at which the quantity of thickness reduction in the reeler mill is the quantity of...
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JPS5781909A |
PURPOSE: To manufacture a seamless large diameter pipe with small driving power by subjecting a pipe material spirally to a process of bending part of said pipe material in its circumferential and axial directions to outer wide, and grad...
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JPS5781912A |
PURPOSE: To obtain a steel pipe of the outside diameter conforming exactly to the target stably by presuming the pattern of the wall thickness of the shell on reeler mill inlet side beforehand, determining the target wall thickness of th...
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JPS5772708A |
PURPOSE: To manufacture a highly accurate product free from the thickness deviation, etc., by arranging plural units of roller guides, respectively comprising plural rolls arranged in a uniform circumferential interval around a cylindric...
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