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WO/2012/005287 |
Provided is a mandrel mill which has three hole-type rolls disposed at each of a plurality of rolling stands and without increase in facility costs or degradation in maintainability, is capable of sufficiently preventing a phenomenon in ...
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WO/2011/154133 |
The invention relates to a method for producing seamless pipes of heated massive metal blocks, by means of a mandrel (4), which is fastened on a rolling rod (5), in the case of which a coating material is applied onto the inner side of t...
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WO/2011/148613 |
A three-roll fixed diameter rolling machine is used, and when the external diameter processing degree (ρi) (%) of an (i)th stand is represented by formula (1) below, fixed diameter rolling is carried out under conditions such that the e...
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WO/2011/107214 |
The invention relates to a hot work tool, in particular a piercing mandrel or a rolling bar for producing seamless pipes or a forging mandrel for hot forging tubular workpieces made of metal, said tool having a main tool body (2), wherei...
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WO/2011/083101 |
The invention relates to a rolling system for producing tubes without welded joints, comprising: a drill (7) for drilling a billet and obtaining a blank (2); a continuous mill (8) for rolling the blank (2), said mill (8) comprising a plu...
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WO/2011/050783 |
The invention relates to a device for the optimized circulation of mandrels, comprising a presentation and/or cooling table for mandrels, a lubricating station for the mandrels, in some cases an additional drying station for the lubrican...
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WO/2011/050783 |
The invention relates to a device for the optimized circulation of mandrels, comprising a presentation and/or cooling table (1) for mandrels, a lubricating station (2) for the mandrels, in some cases an additional drying station for the ...
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WO/2011/039943 |
Disclosed are a retract mandrel mill and a method for rolling tubing using the mandrel mill. The retract mandrel mill is provided with a mandrel mill and an extractor. The mandrel mill includes a mandrel bar and is for rolling a tubing w...
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WO/2011/039942 |
A multi-roll mandrel mill in which "roll chock sections have been made compact" is a mandrel mill which comprises a plurality of grooved roll bodies as roll grooves which press down a pipe material, and which is provided with a plurality...
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WO/2011/039941 |
Disclosed are: a mandrel mill provided with a plurality of rolling stands, in which the rolling stands are provided with three grooved rolls, the three grooved rolls constitute a groove by the rolled surfaces, and when the diameter of th...
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WO/2011/018956 |
Provided is an apparatus for adjusting a screw-down position by which an engagement failure of a leading end of a tubular member which is rolled by a three-roll type mandrel mill, or the like can be prevented. An apparatus (100) for adju...
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WO/2010/097232 |
Disclosed is a roll stand comprising at least two rolls (1) which are designed and arranged so as to form a pass for rolling rod-shaped or tube-shaped rolling stock (2) and so that the rolling stock passes in a rolling direction W during...
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WO/2010/082584 |
Disclosed are a lightweight hollow member, which is highly strong, at e.g., 780 MPa or greater, has complex shapes applicable to automotive components, is highly rigid, and has excellent impact characteristics, and a manufacturing device...
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WO/2010/073035 |
A method of construction of a tungsten carbide/TSP insert for hard facing a wear surface comprises the steps of forming a tungsten carbide body (12) in a mould. After the moulding step, a channel section slot (24) or pocket (24') is crea...
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WO/2009/141414 |
A rolling mill stand and related rolling mill for rolling rod-shaped bodies, even large in size, which meets the requirement of stiffness uniformity of the rolling mill stands in the transversal direction, all the hydraulic capsules bein...
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WO/2009/035106 |
Provided is a roll forming device, which is equipped with a forming roll capable of manufacturing such a mechanism simply and precisely as to input a rotating drive force to the forming roll. The roll forming device inputs the rotating d...
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WO/2009/030105 |
A manufacturing technique of seamless steel pipe comprises process steps as follows, producing a hollow blank pipe(1) with annular cup bottom(2) at one end by centrifugal casting, executing machinework on the inner and outer surface of t...
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WO/2008/146493 |
[PROBLEMS] To provide a mandrel mill or the like that attains not only enhancing of pipe draw ratio but also suppression of pinhole defect occurrence. [MEANS FOR SOLVING PROBLEMS] The first means is a mandrel mill equipped with multiple ...
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WO/2008/128417 |
A seamless steel tube four-roller-type heat sizing mill includes a sizing mainframe, a roller changing vehicle (1) and locking hydraulic cylinders (7). The sizing mainframe comprises a frame, level sizing roller groups and side standing ...
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WO/2008/126633 |
A process for manufacturing a seamless pipe, in which cracking at pipe end portions can be effectively prevented in the stretch rolling step by means of a mandrel mill. The process for manufacturing a seamless pipe is characterized by in...
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WO/2008/123121 |
A method for producing a seamless pipe in which a mandrel bar of the same outside diameter can be employed even when the target thickness of the pipe is different, and partial thickness can be suppressed effectively in the circumferentia...
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WO/2008/123363 |
Provided is a cold-finished seamless steel pipe for an integrally molded drive shaft, which is obtained by cold-extracting a material pipe hot-rolled by the Mannesmann piercing method. In order to retain the maximum inner face wrinkle de...
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WO/2008/123276 |
Provided is a seamless pipe manufacturing method capable of making the longitudinal thickness distribution of a pipe more homogeneous than the prior art. The seamless pipe manufacturing method comprises a first step of measuring an exter...
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WO/2008/111670 |
A process for manufacturing a seamless pipe, in which any thermal seizure likely to occur on the external surface of the pipe in the stretch rolling step by means of a mandrel mill can be effectively prevented. The process for manufactur...
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WO/2008/096864 |
It is possible to manufacture a pipe while substantially eliminating polygonization by performing reduction using a pass roll which has a groove bottom portion containing the center in the roll axis direction and a flange portion adjacen...
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WO/2008/084630 |
Provided is a rolling stand (100) comprising hole-type rolls for rolling a tubular or bar-shaped object. Three hole-type rolls (R21 - R23) are arranged such that the angles for the individual rolls to press are 120 degrees. The rolling s...
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WO/2008/056540 |
Intended is to provide a mandrel mill capable of manufacturing a seamless pipe having no flaw such as a necking flaw. The mandrel mill has a plurality of hole type roll stands installed consecutively, and a mandrel bar (3) is arranged in...
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WO/2008/050627 |
A mandrel mill that with respect to materials whose rolling is inherently not easy, such as hollow stock pipes of stainless steel or thin material, can attain draw rolling thereof at a strikingly enhanced degree of processing and enhance...
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WO/2008/023563 |
A mandrel bar cleaning facility in which carburizing occurring on the inner surface of a pipe during elongation can be suppressed without causing any trouble to operation. The mandrel bar cleaning facility (15) cleans a mandrel bar (B) d...
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WO/2007/144905 |
A rolling mill (10) for processing seamless tubes comprises a plurality of rolling units (U) that are sequentially arranged along a rolling axis (L), each of which is provided with at least three removable working rolls (12), which are e...
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WO/2007/126005 |
A process for stainless-steel pipe production which comprises piercing and rolling a stainless steel containing 10-30 mass% chromium as a raw material to obtain a raw pipe to be finish-rolled, rolling the raw pipe by drawing rolling with...
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WO/2007/114173 |
Disclosed is a method for the surface treatment of a mandrel bar for use in the hot rolling of a high alloy steel seamless pipe, which comprises performing the scaling hot treatment of a mandrel bar and performing 50 passes or more of ro...
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WO/2007/114413 |
Disclosed is a high-strength seamless steel pipe for use in a mechanical structure, which has the following chemical composition (by mass): C: not less than 0.03 and less than 0.1%; Mn: 0.8 to 2.5%; Ti: 0.005 to 0.035%; Nb: 0.003 to 0.04...
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WO/2007/114041 |
Disclosed is a method for production of a seamless pipe, which comprises the steps of: applying a carbon-containing lubricating agent onto a mandrel bar; producing a base tube using a mandrel mill equipped with the mandrel bar on which t...
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WO/2007/111258 |
The quantity of S contained in designing steel component is reduced, a stretch reducer makes a rolling roll to have a hole type profile closer to a true circle in sizing rolling, and a pipe is made to have an appropriate profile ratio (r...
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WO/2007/051242 |
A process for forming a relatively thick-walled hollow bar by hot rolling an elongate member comprises the steps: (i) in at least one pass, rolling the elongate member so as to generally define at least two longitudinally extending porti...
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WO/2007/014911 |
The invention relates to a rolling mill for tubes, in which a series of roll-holder containers (10) is housed in an external structure (2) extended along a rolling axis (L); the containers can slide inside the structure to be extracted t...
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WO/2007/015484 |
A detection device and a detection method for automatically detecting flaws occurring on a raw tube manufactured by rolling a hollow shell by using a mandrel mill. The flaw detection device (100) comprises a wall thickness gauge (1) disp...
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WO/2006/106938 |
A drawing/rolling control method capable of manufacturing a raw tube with high dimensional accuracy and suppressing a trouble in rolling. The groove bottom wall thickness of the raw tube (P) is measured on a &num 1 stand with an ultrason...
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WO/2006/106961 |
A process which comprises: a first coating step in which a first liquid is applied to the surface of a high-temperature mandrel bar immediately after preceding stretching/rolling to thereby form a water-resistant coating film; a water-co...
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WO/2006/104146 |
A drawing rolling method by a mandrel mill by which overfill and underfill can be prevented through combination of one kind of grooved rolling rolls. Outside diameter of a hollow shell is set such that the ratio (outer circumferential le...
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WO/2006/090718 |
This invention provides a process for producing a seamless pipe while effectively suppressing carburizing which occurs in a seamless pipe without affecting the operation. The production process comprises the steps of cleaning a transfer ...
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WO/2006/088107 |
This invention provides a process for producing a seamless steel pipe that can produce a seamless steel pipe while effectively suppressing a failure of a mandrel bar to be withdrawn after stretch-rolling of a rolling material formed of a...
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WO/2006/078768 |
Continuous coil tubing (100) made from shorter lengths of flat metal strip (26) which are spliced end-to end and formed into tubular form (104) and seam welded and thereafter introduced into a forging or hot reduction process (106) . Fin...
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WO/2006/046702 |
A production method of a seamless steel pipe in which uneven thickness likely occurring in a thin-wall seamless steel pipe can be controlled effectively. A billet soaked for a predetermined time at a predetermined temperature in a heatin...
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WO/2006/008804 |
A method for the hot working of a Cr-containing steel, which comprises holding a newly formed surface of the Cr-containing steel in a steam atmosphere, to thereby form an oxidized scale containing FeO, and then carrying out a subsequent ...
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WO/2006/003975 |
A rolling control method for a mandrel mill, a rolling control device, a control program, and a seamless tube. In the method, the press-down position of a first hole type rolling roll disposed on a finish stand (&num i) is displaced outw...
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WO/2005/123289 |
A process for producing a seamless steel pipe, in which the occurrence of inner surface flaw in the pipe can be reduced through lowering of the friction coefficient at draw rolling by means of a mandrel mill. At the draw rolling of hollo...
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WO/2005/115650 |
A round billet comprising 10.50 to 14.00% by mass of Cr and satisfying a value of not more than 9.0% as determined by a formula [Cr + 4Si - (22C + 0.5Mn + 1.5Ni + 30N)] wherein the symbol of element represents the content (% by mass) of ...
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WO/2005/095013 |
A method and a device for controlling the fixed diameter rolling of a tube. The fixed diameter rolling control method for the tube controlling the rotational speed of rolling rolls (21) disposed on stands when the tube end part of the tu...
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