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Matches 251 - 300 out of 1,205

Document Document Title
JP3287045
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...  
JP2002066610
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...  
JP2002066611
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...  
JP3282797
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...  
JP2002035810
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...  
JP2002035809
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...  
JP2002035812
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...  
JP2002035817
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...  
JP2002028704
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...  
JP2002001406
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...  
JP2001340904
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...  
JP2001340910
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...  
JP3256162
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...  
JP2001303207
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...  
JP2001300607
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...  
JP2001293506
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...  
JP3239799
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...  
JP3239819
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...  
JP2001276912
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...  
JP2001269705
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...  
JP2001259713
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...  
JP2001259711
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...  
JP2001259712
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...  
JP2001259710
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...  
JP3228169
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...  
JP2001234189
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...  
JP2001232404
To provide a rolling method for a metallic pipe by which biting ability is improved and also the generation of fin flaws is prevented in sizing rolling with a sizing machine such as a sizer.A slip inhibitor in which a granular body is di...  
JP3224484
PURPOSE: To execute skew rolling of a metallic tube stably and at high efficiency. CONSTITUTION: A skew rolling device 13 has an inclined-angle imparting motor 26 for imparting an inclined angle β to forming rolls 20, roll-driving torqu...  
JP2001219205
To provide a piercing method using inclined rolls by which the generation of the pieces of a broken tube at the bottom tube-end after rolling is perfectly prevented.Piercing is performed by providing a small hole in the middle part of th...  
JP2001219204
To manufacture a seamless steel tube of a high-load material by a line for mainly manufacturing medium/small-diameter size seamless steel tube using an inclined piercer.After piercing a billet 1 with the inclined piercer 2, a roll gap an...  
JP2001219206
To obtain compact and inexpensive manufacturing equipment with which seamless steel tubes of from ordinary steel to high alloy steel are manufactured by a manufacturing line for seamless steel tubes using an inclined piercer.In this equi...  
JP2001219207
To manufacture a large-diameter/thin-walled size seamless steel tube excellent in the accuracy of thickness.In a rolling line which is provided with a piercer 2, an inclined rolling mill 3 and a plug mill 4, by changing the conveying dir...  
JP2001205323
To develope a rolling method with which not only stripping property is improved but the quality of rolling with a sizing mill or a extractor mill is improved. In a rolling method with a retract mandrel mill, a shell outside diameter mete...  
JP2001205328
To provide a manufacturing method of seamless steel tubes and a jig for manufacturing seamless steel tubes by which products having good inside surface are made by removing the scale which is present on the inside surface of a tube stock...  
JP3214379
To eliminate the defect of internal quality of a cast billet, to improve the production efficiency of a seamless steel pipe and to reduce the production cost by continuously casting a steel containing a prescribed wt.% or higher of Cr wi...  
JP3214377
To provide a producing method for a round cast billet which eliminates porosity and solidified structure, improves the internal quality of the cast billet and fully prevents the inner flaw at the time of pipe-making. The producing method...  
JP2001162307
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...  
JP2001162306
To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting ...  
JP2001137913
To prevent a generation of defects on the inside surface without lowering productivity even when a seamless steel tube consisting of high carbon steel is manufactured. This method is provided for manufacturing the high carbon steel seaml...  
JP2001129603
To provide a drawing and rolling method of a pipe capable of reducing the squarioh inward of a pipe so as not to enlarge crop and flaws on the surface of the pipe, and require a complicated mechanism. In the drawing and rolling method of...  
JP2001121203
To correctly estimate and identify the causes of thickness non-uniformity, and to take an appropriate thickness non-uniformity preventive action in an early stage in manufacturing a seamless pipe. In a thickness non-uniformity monitoring...  
JP2001105012
To provide a manufacturing method of seamless steel tubes which is devised so as to preliminarily reduce surplus for a small lot of materials. This is a method for manufacturing the seamless steel tubes on a manufacturing line in which a...  
JP2001096304
To prevent generation of flows on the outer surface of a martensitic stainless steel piece containing Cr: 10.0∼16.0 wt.%, Ni: 1.0∼8.0 wt.% in rolling it. A lower layer of oxide scale produced on the surface of a martensitic stainless...  
JP2001058207
To provide a steel tube free from any inner surface flaws without preworking a difficult-to-work material, in particular, a stock material inferior in the inner quality of the as-cast stock material by providing a back pressure applying ...  
JP2001047101
To provide a method and rolling equipment for manufacturing the small quantities of wires, bars and also tubes a year by an economical method. As the method, the rolling of the wires and bars is executed on one side, the rolling of seaml...  
JP2001038407
To control diameter reduction of the rear end portion of a hollow material pipe by moving a plug in the direction opposite to the piercing rolling direction when a predetermined portion on the rear end side in the rolling direction is ro...  
JP2001009507
To perform a stable pierce rolling by adjusting a disc roll slanting angle in a way that an outer diameter of a hollow pipe coincides with a target value while installing a disc roll slantable against a pass line and movable in a pass li...  
JP2001009508
To provide a method of piercing a round cast steel which can reduce thickness nonuniformity even by using roller shoes for multiple sizes when the round cast steel is pierced with a piercer rolling mill to make it into a hollow pipe for ...  
JP2001009510
To prolong plug life and improve productivity by cooling and lubricating a piercer or elongator plug and making the OK/NG judgment.This equipment is equipped with a plug fitting unit 70 to fit a piercing plug 1 to a plug bar 10, a transp...  
JP2000343106
To provide a speed-changing rolling method of an Assel mill to minimize hindrance of productivity during seamless steel pipe elongator rolling.In this speed-changing method of an Assel mill, when the number of revolutions of rolls is con...  

Matches 251 - 300 out of 1,205