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Patent Searching and Data


Matches 451 - 500 out of 2,130

Document Document Title
JP2002282906A
To achieve an improvement in the uniformity of pipe wall thickness and stabilization of piercing rolling in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A method comprises a process in which ...  
JP2002273505A
To provide a manufacturing method of a seamless steel tube which is excellent in quality of internal surface.This method is a method for manufacturing the seamless tube by piercing a billet by using a plug on the surface of which a scale...  
JP3319428B2  
JP2002248506A
To provide an inclined rolling machine for a seamless pipe and a rolling method thereof by which the baking of a disc roll comprising the inclined rolling machine can be suppressed, and the fault of a guide mark can be reduced.In rolling...  
JP2002239612A
To provide a method for manufacturing a seamless tube made of high-alloy steel being a heavy-load material at a low cost with a manufacturing line for seamless tubes using an inclined piercing mill.In the seamless tube manufacturing line...  
JP2002239613A
To provide a method for manufacturing a seamless tube made of high-alloy steel being a heavy-load material at a low cost with a manufacturing line for seamless tubes using an inclined piercing mill.After a base stock is machined into the...  
JP2002224711A
To provide a manufacturing method of seamless pipes excellent in properties of the inner wall and the internal body.Circular billets hot-rolled from slabs made at continuous casters whose segregation displacement ratio P(%) is 5 to 40% a...  
JP2002224712A
To provide multiple-hump rolls for Asser mills solving problems about a reduction in rolling efficiency, a variation in wall thickness, etc., due to an insufficient bulge of shells after rolling and difficulty for pulling out mandrels at...  
JP2002210508A
To provide a radius shape in the body part of a plug for reducing flaws on the inside surface of a steel tube when manufacturing a seamless steel tube by Mannesmann process and a manufacturing method for the seamless steel tube using the...  
JP2002210507A
To provide a piercing method for a seamless steel tube.In a method for piercing the seamless steel tube, in this piercing method of the seamless steel tube, by working the tip part of a billet into a taper shape and working the shape of ...  
JP3304963B2  
JP2002192229A
To accurately detect the generation of end-blocking deemed undetectable.A device for detecting a slip is provided with: a detecting means 14 for a driving torque current of the main roll of a piercer, a detecting means 18 for a driving t...  
JP3309807B2
To provide a size-free rolling method of metallic materials in which the finished cross-sectional shape in the outer peripheral part is approximately complete roundness, the uneven diameter difference is extremely small and the cross-sec...  
JP3307294B2
To provide the method and device for manufacturing a seamless steel tube made of an Fe-base alloy whose Cr content is <15 wt.%, which are immediately applicable to existing manufacturing equipment by which a product steel tube reduced in...  
JP3305604B2
To prevent generation of inside surface scratch of steel tube and to manufacture seamless tube with excellent inside surface skin by manufacturing a rolling stock for seamless tube of specified shape and then piercing rolling the rolling...  
JP3297994B2
To obtain a rolling mill to cope with the production of small quantities in many kinds of seamless steel tubes sized from a small diameter to a large diameter by providing a means of turning a cannon holder and making it travel along a p...  
JP2002113507A
To provide a plug for piercing a seamless steel tube which has a long life even in rolling of high-allow steel such as stainless steel and a Ni-base alloy and with which a tube excellent in the properties of the inside surface because of...  
JP2002102906A
To provide a method for rolling a seamless steel pipe capable of suppressing the generation of non-uniform thickness, and rolling high quality hollow pipes in the method which performs, holding a hollow pipe with a holding device, a roll...  
JP2002103002A
To provide a method for producing a cast billet having little porosity without applying rolling reduction to the cast billet after casting, and a method for producing a seamless steel tube having little internal flaw by using the round c...  
JP2002102924A
To provide a method for detecting a plug dropout which requires no more measures to protect the environment preventing fumes and dust than before without imparting physically bad influences to workers and capable of preventing damage to ...  
JP2002096105A
To manufacture a high-strength steel pipe which restrains inner flaws from being caused and which is excellent in resistance to sulfide, stress and corrosion cracking.Seemless pipes are manufactured by the direct hot rolling of billets m...  
JP3287045B2
PURPOSE: To reduce the thermal load of a rolling roll by effectively heating the ring material which is rolled between upper and lower rolling rolls. CONSTITUTION: A guide roll 9 which is brought into contact with a ring material 3 to be...  
JP2002066610A
To provide a manufacturing device for a seamless metal pipe comprising a main roll having excellent abrasion resistance without loss of slip resistance, and to provide an effective manufacturing method for the seamless metal pipe.The man...  
JP2002066611A
To provide a rolling method by use of a barrel-type skew rolling roll capable of enhancing a pipe-spreading rate of a material or a pipe material on rolling, even if a skew rolling mill comprising a barrel-type roll is employed to a manu...  
JP3282797B2
To automatically remove iron pieces stuck after burning to the outer peripheral surface of a roll without dismounting inclined rolls from the main body of the mill in the inclined roll mill provided with the inclined rolls which are arra...  
JP2002035812A
To provide a method for rolling raw tubes for seamless steel tube manufacture by which rough tubes having an equivalent or better wall thickness distribution are obtained, compared with the ease where a fixed shoe is provided even if a P...  
JP2002035817A
To efficiently manufacture a seamless steel pipe whose finishing dimension is secured thanks to the continuously manufacturing line since deflected wall thickness in the circumferential direction is less and the thickness in the end of t...  
JP2002035810A
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide the method for r...  
JP2002035809A
To provide a method for rolling seamless steel tubes by which a thin tube can be manufactured in the mandrel mill system by solving a perforation problem in the mandrel mill rolling, specifically, for example, to provide a method for rol...  
JP2002028704A
To improve the capacity of a planetary inclined rolling mill.The supply of a pipe shape 17 to be rolled to a roller nip is continuously performed in the state where its butt surface is abutted on the butt surface of the succeeding pipe s...  
JP2002001406A
To harmonize a rolling stand frame into power generated through the rolling process by simplifying fabrication, handling procedures and construction of a rolling stand frame.A module constructional rolling mill, in particular a rolling s...  
JP3239894B2  
JP3239895B2  
JP3239896B2  
JP2001340904A
To provide a piercing rolling method of a seamless steel pipe preventing seizure on disk rolls.In piercing rolling of the seamless steel pipe by means of a rolling machine having a pair of disk rolls, the piercing rolling method of the s...  
JP2001340910A
To provide a manufacturing method of a seamless steel pipe capable of restraining decrease of wall thickness of a pipe at a back end portion of the pipe more efficient than before, when expanding and reeling the pipe in a skew rolling mi...  
JP3256162B2
To provide a manufacturing method for a welded steel pipe by which yield ratio in the axial direction of the tube that is only raised in the manufacturing process in a conventional method is lowered. In the manufacturing method of the we...  
JP2001303207A
To provide a martensitic seamless stainless steel pipe whose surface is provided with scale excellent in adhesion and to provide its producing method. This martensitic seamless stainless steel pipe contains, by mass, 0.2 to 0.5% Ni and 9...  
JP2001300607A
To provide a plug for improving the service life of the plug and the quality of the inside surface of a material to be rolled in the manufacture of a steel tube. The plug which is used for manufacturing the steel tube is composed of a ce...  
JP2001293506A
To simplify the structure of a roll forming device, to reduce the manufacturing cost and to maintain the identity of the distance from each forming roller to the center of a work with high accuracy. In the roll forming device 30, the wor...  
JP3239799B2
To provide a manufacturing method of a seamless tube that is excellent in the durability of piercing plug. In this manufacturing method, a billet is arranged on the pass line of roll which are arranged obliquely to the advancing directio...  
JP3239819B2
To absorb the fluctuation of a rolling load at the time of an abnormal rolling in manufacturing a seamless steel tube, and to simply repair the equipment of the rolling mill. On the rolling down device of this rolling mill, hydraulic cyl...  
JP2001276912A
To provide a method for piercing rolling a seamless pipe by which an external diameter of a tip of a hollow material pipe can be controlled to enlarge and by which an external diameter deviation between the tip of the hollow material pip...  
JP2001269705A
To solve such a problem that the out-of-roundness of a steel tube is degraded when unfilling that noncontact part with a grooved roll in the stand before the final one is produced in a part of the outside surface of the steel tube at siz...  
JP2001259711A
To provide the inexpensive and simple manufacturing method of a seamless steel tube by which the damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like.In a Mannesmann ske...  
JP2001259712A
To provide a method capable of manufacturing a seamless steel tube excellent in quality without lowering productivity from a billet obtained by lengthwise-slitting a wide cast slab.In the method of manufacturing the seamless steel tube b...  
JP2001259710A
To provide a roller shoe for skew rolling mills with which the slip of a base stock or a tube stock during rolling is suppressed, also tailing off is smoothed and the so called flare (the expansion of the diameter of an end part) and tor...  
JP2001259713A
To provide an inexpensive and simple manufacturing method of a seamless steel tube by which damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like.In a Mannesmann skew pie...  
JP3228169B2
To obtain a piercing plug for a seamless metallic tube which restricts an adopted fault generating on the inside surface of a product tube and which does not reduce the life of the plug by making the thickness of scale skin film of a ree...  
JP2001234189A
To obtain a lubricant capable of prolonging the life of a plug for piercing rolling a seamless steel pipe and to provide a method for piercing rolling a seamless steel pipe using this lubricant.The lubricant is composed of 1-10% of a gra...  

Matches 451 - 500 out of 2,130