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JP60154811 |
PURPOSE: To make the cut off quantity of crop to be almost zero by rolling only pipe ends, having large wall thickness each, after stretch reducing a pipe stock, and finishing the pipe ends into the prescribed outer diameter and wall thi...
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JP60141315 |
PURPOSE: To make an installation small in size and to speed up a titled work by forming a pass which becomes narrower while undulating in bellows shape in the inner surface of an annular tool and working a long columnar body inserted in ...
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JP60141314 |
PURPOSE: To extend the plastically deformed part of a long columnar body into a spiral shape by pressing the working face of a caliber of eccentric ring roll against the column surface of a columnar body to plastically deform a part ther...
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JP60137516 |
PURPOSE: To prevent abnormal thickness and to reduce dispersion in length or thickness of tube stocks by learning and controlling the amount of advance of a piercing plug basing on the actual thickness or correction term when rolling the...
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JP60137509 |
PURPOSE: To reduce the twist of a pipe and to prevent the pipe from causing ruggedness, crease, and flaw, etc. by relatively moving a mandrel in the reverse direction to the relative movement of an annular tool with respect to the pipe. ...
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JP60137511 |
PURPOSE: To provide wear resistance, erosion resistance, and seizure resistance, etc. to a mandrel and to improve its service life by providing a ceramic tip part to a body part of the mandrel made of low-alloy steel. CONSTITUTION: A tip...
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JP60137507 |
PURPOSE: To obtain long columnar bodies having different finished dimensions in a wire range with the same tool by adjusting the phase difference of eccentric rotation between an eccentric ring roll and a columnar body bearing device. CO...
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JP60137508 |
PURPOSE: To form-roll long columnar bodies having different dimensions in a wide range by deciding the eccentric quantity of the center of a ring roll caliber with respect to the axial center of a gear by the combination of the key groov...
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JP60127015 |
PURPOSE: To roll a tube for which allowable limit of inner diameter is designated at high accuracy by determining objective outer diameter at the time of rolling from thickness after sizer rolling estimated from actual result of size of ...
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JP60127008 |
PURPOSE: To improve remarkably bottom-surface wearing of a plug by providing a hard facing with the use of a wear-resisting metal to the mandrel bar contacting part of the bottom surface of a plug of reeling mill. CONSTITUTION: The conta...
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JP60124405 |
PURPOSE: To prevent the generation of inner-surface flaws at the front end of a hollow blank piep and to improve the yield of a product by regulating the temperature of a plug arranged at the front side of the billet transferring directi...
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JP60124404 |
PURPOSE: To prevent the wall-thickness deviation due to eccentricity at the rear end of a hollow blank pipe and to improve the yield of a product by piercing a hole having specific dimensions and shape in the central position of the rear...
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JP60118308 |
PURPOSE: To reduce the wear of shoe and to prevent a product from flaws generating in its outer surface by deviating the position of shoe-bottom at the contacting surface contacting a shell from the center line of a cross section of shoe...
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JP60115309 |
PURPOSE: To make a final product accurate in dimensions and to improve its yield by providing a cooling device capable of controlling the flow rate, etc. of a cooling liquid to the front and back of an elongator and making the temperatur...
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JP60115310 |
PURPOSE: To improve remarkably the advancing speed of a material to be rolled by applying a tensile stress, within a range of the yielding stress of the material, in reducing the wall thickness of tube end by rolling. CONSTITUTION: A man...
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JP60106605 |
PURPOSE: To finish the inner surface of a blank pipe into an approximately round and to finish the pipe highly precisely in dimension by arranging rolls so that their axial directions have each a prescribed slanting angle with respect to...
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JP60102221 |
PURPOSE: To control thickness of a tube within allowable deviation by controlling roll opening and plug position using measured value of a thickness gauge. CONSTITUTION: Roll opening is controlled by a roll opening controlling device 4 a...
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JP60099406 |
PURPOSE: To roll a pipe under high rolling reduction by an installation of small capacity and to press-reduce the pipe in high dimensional accuracy by moving ring rolls in the direction intersecting with a mandrel axis to reduce the wall...
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JP60099407 |
PURPOSE: To improve the seizure resisting and wear resisting properties of a titled guide shoe by providing prescribed layers containing ceramics to the surface of guide shoe opposite to a material to be rolled which is liable to cause s...
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JP60068104 |
PURPOSE: To obtain a titled mill capable of stably rolling a blank pipe without damaging its surface by slantly arranging a pair of driving roll shoes, having each inlet and outlet face angles, at the adjacent positions to rolling rolls ...
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JP60064716 |
PURPOSE: To prevent a seamless steel pipe from producing wall-thickness deviation by detecting the displacement quantity of the axial center of a rolling plug with respcet to the center line in the logitudinal direction of a pass line an...
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JP60056406 |
PURPOSE: To prevent the seizure between a billet and a guide shoe and to obtain a hollow shell having excellent quality and free from surface defects by applying a hot-rolling lubricant used for rolling tools, etc. to the guide shoe in M...
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JP60054222 |
PURPOSE: To finish a steel pipe to a non-defective pipe having no uneven thickness by detecting a displacement against a pass line of a rolling plug supporting bar, changing a rotating speed of one of inclined rolls, and correcting the d...
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JP60054223 |
PURPOSE: To eliminate a displacement against a pass line of a plug, and to finish a steel pipe to a non-defective pipe having no uneven thickness by adjusting an angle of a truncated cone shape of an inclined roll, and equalizing an oppo...
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JP60054209 |
PURPOSE: To improve the quality of product by displacing the axial center line of a plug bar by a prescribed quantity from the pass line of a mill to the direction of one side of guide shoes located oppositely to each other and setting t...
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JP60054208 |
PURPOSE: To improve the quality of product by displacing the axial center line of a plug bar by a prescribed quantity from the pass line of a mill to the direction of one side of guide shoes located oppositely to each other and setting t...
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JP60033807 |
PURPOSE: To reduce the degree of wall-thickness deviation of a seamless pipe by specifying the connecting conditions between a plug and a connecting member provided to the tip of a mandrel bar in the manufacture of a seamless pipe by a M...
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JP60024203 |
PURPOSE: To obtain a titled disk capable of preventing the flaw generating in the outer surface of a product pipe and improving operating efficiency by forming a nonmetallic film on the surface of a disk used for manufacturing a pipe for...
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JP60021111 |
PURPOSE: To produce a seamless steel pipe having high quality with high efficiency by performing piercing while supplying a liquid paint mixture composed of metallic oxide powder and granules and a binder to the circumferential surface o...
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JP60009504 |
PURPOSE: To prevent the generation of seizing defect, etc. in the pipe surface by providing balls to the space between the slidingly contacting surfaces of disks and an opposing material, in disher disks used for pipe manufacturing toget...
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JP60006208 |
PURPOSE: To prevent generation of the flaw caused by the scale on the inside surface of a steel pipe in a rolling method of a hollow blank pipe by a roll piercing method by feeding fluid through the inside of a mandrel supporting a plug ...
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JP60006216 |
PURPOSE: To improve the resistance of a guide shoe to seizure and to improve the durability and productivity thereof by providing a recess of a specific depth on the guiding surface of the guide shoe and spraying thermally and depositing...
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JP59212106 |
PURPOSE: To prevent the generation of outer surface flaws of a finished pipe by gradually reducing the outer diameter, at the outlet side of the end part to be rolled of a blank pipe, in a circular arcuate shape along the axial direction...
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JP59206105 |
PURPOSE: To prevent the generation of an eccentric wall-thickness deviation and to obtain a high-quality seamless pipe by connecting swingably a plug to a mandrel bar and aligning the axial center line of the plug with that of a material...
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JP59197305 |
PURPOSE: To manufacture easily a hollow bar material excellent in dimensional accuracy without using a mandrel by elongation-rolling a hollow blank material by a skew rolling mill equipped with plural cone-type rolls forming specific int...
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JP59174203 |
PURPOSE: To reduce remarkably the generation of specks such as pits or eruption by forming a center hole which satisfies a prescribed condition at the center of the rear-end surface of a billet before piercing, in a Mannesmann pipe manuf...
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JP59169607 |
PURPOSE: To provide a titled piercer capable of efficiently mending and exchanging disks without moving work rolls vertically by horizontally turning the guide disks used for supporting a material between upper and lower rolls around the...
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JP59159218 |
PURPOSE: To grasp accurately a condition of the wall thickness deviation of a pipe and the causes of its generation by continuously measuring a vibrating condition in the longitudinal direction of a blank pipe in rolling and monitoring t...
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JP59153506 |
PURPOSE: To improve the seizure-and-peel-resistant properties of a guide shoe and to extend its service life by using a guide shoe, for manufacturing a seamless pipe, having the surface provided with an undercut part on which ceramics ar...
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JP59150613 |
PURPOSE: To improve the quality of a round billet to be rolled by providing a tension detector to a holding device of a mandrel bar and making the gap between barrl-type rolls changeable in accordnace with the vairation of the tension of...
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JP59141307 |
PURPOSE: To remove easily the seizure of caliber end and to prevent edge mark by pressing a grinding wheel,having circular-arcuate surface corresponding to a groove of semicircular caliber-end of a finishing mill, against said caliber en...
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JP59133930 |
PURPOSE: To reduce considerably the sectional area of a pipe by pressure with a relatively small-sized installation by making small the contact area of ring roll calibers and the pipe to deform locally the pipe and making the pipe deform...
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JP59133929 |
PURPOSE: To decrease uniformly the sectional area of a long columnar body by supporting said body with supporting devices adjacent to an eccentric ring roll, pressing the caliber surface of the eccentric ring roll to the surface of the l...
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JP59118206 |
PURPOSE: To detect easily the generation of thickness deviation due to the off- center of a plug by detecting a thrust load acting on the rolling plug of mill during rolling, and judging the generating condition of the thickness deviatio...
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JP59110414 |
PURPOSE: To make the wall thickness of a final product uniform in its longitudinal direction, by controlling the position of a rolling plug while a rolling is operated in an elongator so that a rolling load is kept constant at the time o...
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JP59094515 |
PURPOSE: To improve the outer diam. controlling accuracy of a product steel pipe, by setting respectively the extents of control with respect to the reference set values of respective distances between the bottoms of roll grooves of at l...
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JP59094514 |
PURPOSE: To improve the outer diameter controlling accuracy of a product steel pipe, by including the apparent increasing portion of a shrinkage coefficient of outer diam. due to a wear of roll into a shrinkage corfficient of outer diam....
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JP59092108 |
PURPOSE: To make the wall thickness of a finish pipe obtd. in reduction uniform by providing the clearance as much as the predicted amt. of the expansion in the outside diameter at the end of a hollow blank pipe with reduced thickness ro...
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JP59092109 |
PURPOSE: To provide a titled reduced thickness rolling device which suppresses flaring with the thickness reduction in the outside peripheral part at the end of a hollow blank pipe by disposing guide shoes which restrain the outside peri...
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JP59092107 |
PURPOSE: To obtain a seamless steel pipe which is smoothly reduced in thickness at the end of a hollow blank pipe by adjusting relatively the revolving speed and rotating speed of rolling rolls to prevent the roling rolls from exterting ...
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