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Patent Searching and Data


Matches 451 - 500 out of 2,092

Document Document Title
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...  
JP2001232404A
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...  
JP3224484B2
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...  
JP2001219206A
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...  
JP2001219205A
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...  
JP2001219204A
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...  
JP2001219207A
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...  
JP2001205328A
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...  
JP2001205323A
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...  
JP3214379B2
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...  
JP3214377B2
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...  
JP2001162306A
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 ...  
JP2001162307A
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 ...  
JP2001137913A
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...  
JP2001129603A
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...  
JP2001121203A
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...  
JP2001105012A
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...  
JP2001096304A
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...  
JP2001058207A
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 ...  
JP2001047101A
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...  
JP2001038407A
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...  
JP3125692B2  
JP2001009507A
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...  
JP2001009508A
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 ...  
JP2001009510A
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...  
JP2000343106A
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...  
JP2000334507A
To provide a roll slip inhibitor for hot rolling with which the improvement of biting property and prevention of choking in piercing are possible and piercing method by which stable operation is enabled and products excellent in internal...  
JP2000334505A
To suppress the cost of material by using a cast billet consisting of a hard-to-work material or an as-cast material and to prevent flaws on the inside surface of a tube even when Mannesmann piercing is executed by confining the rotation...  
JP2000334506A
To suppress the occurrence of flaws at the time of tube making when Mannesmann piercing is mainly applied to diffucult-to-work materials which is inferior in hot workability and taken as being unsuitable to the material for seamless stee...  
JP2000326002A
To allow the section shape of a seamless steel tube to be completely round and to straighten the bend thereof by using a rotary sizer whose roll shape is deformed uneven as the rotary sizer in a process for improving the roundness. The r...  
JP3129064B2
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast bill...  
JP2000312907A
To provide a steel pipe with isotropic and superior ductility and collision-impact resistance characteristics without requiring a large-scale process modification by combining stretch-rolling and skew-rolling at the rolling temperature f...  
JP3127822B2
To provide a method for manufacturing the seamless steel pipe made of a high W duplex stainless steel. After heating a billet made of a duplex stainless steel, containing W of 1.5wt.% or higher and 5wt.% or lower in a temperature range i...  
JP2000301214A
To reduce rotational acceleration and to secure the accuracy of centering of a position of a piercing plug by being provided with a core bar shifter for restraining or releasing the end part of the core bar and a driving device for rotat...  
JP2000301212A
To provide a rolling method of a tube stock for seamless tubes for not generating pleat-shaped stripping/bulging defects on the inside surface of the tube stock at the time of rolling and piercing the tube stock for seamless tubes with a...  
JP2000301213A
To secure workability and to prevent the generation of internal flaws at the time of executing Mannesmann piercing of high carbon steel. A billet which is made by continuously casting the high-carbon steel containing, by weight, 0.60 to ...  
JP3120927B2
PURPOSE: To provide a manufacture method of a seamless steel tube having grain refining organization. CONSTITUTION: This seamless steel tube having grain refining organization is manufactured as below. After a steel heated to a high temp...  
JP3119160B2
To prevent defective bite, the contraction of a tube end, and the occurrence of an uneven thickness, and to improve quality and productivity even when piercing rolling a thick tube with high expansion ratio and low ratio of piercing by s...  
JP2000280008A
To drill a hollow pipe whose thickness nonuniformity is suppressed by using specific values for the distance between an inclined roll center and a mandrel holding device adjacent to the inclined roll, distance between mutually adjacent m...  

Matches 451 - 500 out of 2,092