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| Number | Title | Issue Date |
| 8104316 | Piercing mill A piercing mill includes a plurality of inclined rolls, a plug, a pusher, and an undriven guide roll. The pusher pushes a round billet from the rear end at least until the round billet advances for a prescribed distance after contacting the inclined rolls. The guide... | 01/31/2012 |
| 8082768 | Piercing and rolling plug, method of regenerating such piercing and rolling plug, and equipment line for regenerating such piercing and rolling plug A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a pl... | 12/27/2011 |
| 8079243 | Plug, method of expanding inside diameter of metal pipe or tube using such plug, method of manufacturing metal pipe or tube, and metal pipe or tube The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases... | 12/20/2011 |
| 8065900 | Method of manufacturing plug used to pierce and roll metal material, method of manufacturing metal pipe and plug used to pierce and roll metal material A plug material having a prescribed shape is prepared, the prepared plug material is thermally treated in a heat treatment atmosphere that contains at least 1.0 vol. % oxygen at a heat treatment temperature of at least 950° C. and less than 1050° C. and thus a plu... | 11/29/2011 |
| 8020421 | Pusher device for piercing and rolling and method of manufacturing seamless pipe or tube using the same A pusher device 4 includes a cylinder device 30 and a pusher mandrel 34. The cylinder device 30 includes a cylinder shaft 32. The pusher mandrel 34 is attached to the tip end of the cylinder shaft 32. The tip end of t... | 09/20/2011 |
| 7788957 | Apparatus for pipe end sizing and method for pipe end sizing An apparatus for sizing a pipe end comprising: a plug 3 for sizing the pipe end; a chuck 2 for clamping the pipe; and shifting means for shifting the position of the plug 3 and/the chuck 2, which are placed successively from the end of th... | 09/07/2010 |
| 7757528 | Method of manufacturing seamless pipe or tube A billet is provided on a pass line between a pusher and a plug, and the billet is advanced and caught between a plurality of inclined rolls. At least between when said caught billet contacts said plug and when the piercing and rolling reaches a steady state, the ad... | 07/20/2010 |
| 7739892 | Method of manufacturing seamless pipes Seamless pipes excellent in quality features with high productivity is made by a by carrying out piercing-rolling using a piercer provided with a pair of inclined rolls. The piercing-rolling is carried out under conditions such that the plug tip draft (TDFT) or the ... | 06/22/2010 |
| 7578157 | Piercing-rolling method and piercing-rolling apparatus for seamless tubes To provide a method and apparatus for seamless tubes in which the occurrence of material peeling can be prevented even when the skew angle δ and tube expansion ratio are increased. A piercing-rolling method for seamless tubes using a piercer, which is provid... | 08/25/2009 |
| 7536888 | Process for manufacturing a seamless tube A high quality hollow shell in which the occurrence of internal surface flaws caused by the rotary forging effect and/or shear deformation is prevented by suppressing the rotary forging frequency and shear deformation in a transient region at the stage of billet gri... | 05/26/2009 |
| 7530248 | Plug for use in piercing mill A plug has a tip end portion, a taper portion, and a middle portion. The surface of the tip end portion is a spherical surface whose radius of curvature is R1 and length is L1 that is shorter than R1. The outer diameter of the taper portion on t... | 05/12/2009 |
| 7506526 | Seamless tube piercing/rolling plug, and seamless tube producing method using same The present invention provides a seamless tube piercing/rolling plug and a seamless tube producing method in which piercing/rolling is performed with an inclined rotary piercing mill while the seamless tube piercing/rolling plug is used as a piercing tool. The seaml... | 03/24/2009 |
| 7469565 | Manufacturing method and cleaning equipment for seamless tube A seamless tube is manufactured while effectively suppressing the occurrence of carburization in the seamless tube without interfering with operations. A seamless tube is manufactured by a step of washing at least a portion of a conveyor installed in a convey... | 12/30/2008 |
| 7434434 | Method and apparatus for producing a cylindrical hollow body from a blank A method is described for producing a cylindrical hollow body from a blank, with the workpiece being opened in the core region by successive swaging which is angularly offset against each other about the axis of the workpiece and being simultaneously pushed onto a p... | 10/14/2008 |
| 7383710 | Seamless tube piercing/rolling apparatus, and seamless tube producing therewith A seamless tube producing method uses a piercing/rolling plug wherein piercing/rolling is performed with an inclined rotary piercing mill while the seamless tube piercing/rolling plug is used as a piercing tool. In one mode, a front part and a rear part of the split... | 06/10/2008 |
| 7325429 | Method for manufacturing seamless steel pipe or tube A round billet containing, by mass %, 10.50 to 14.00% of Cr with a value represented by the equation of “Cr+4Si−(22C+0.5Mn+1.5Ni+30N)” of not more than 9.0%, wherein the symbols of the elements represent the contents, by mass %, of the elements in the steel, i... | 02/05/2008 |
| 7316143 | Seamless steel tubes and method for producing the same A seamless steel tube comprising, in mass %, C: 0.30 to 0.50%, Si: 0.5% or less, Mn: 0.3 to 2.0%, P: 0.025% or less, S: 0.005% or less, Cr: 0.15 to 1.0%, Al: 0.001 to 0.05%, Ti: 0.005 to 0.05%, N: 0.02% or less, B: 0.0005 to 0.01% and O (oxygen): 0.0050% or less, wh... | 01/08/2008 |
| 7308812 | Process for producing seamless steel pipe A process for producing a seamless steel pipe, in which the occurrence of inner surface flaws in the pipe can be reduced through the lowering of the friction coefficient during the elongation rolling by means of a mandrel mill is provided. The reduction of inner sur... | 12/18/2007 |
| 7293443 | Method for manufacturing seamless pipes or tubes A method for manufacturing a seamless pipe, capable of preventing the carburization phenomenon that occurs in a manufacturing process of pipe and simplifying an elongation rolling process, is provided. In this method, after piercing in the piercing rolling process, ... | 11/13/2007 |
| 7260966 | Tube shell for manufacturing a seamless steel pipe and a method for its manufacture A pierced shell of an austenitic stainless steel having a good inner surface condition is provided, and a means is established which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainless steel. An austenitic stainless ... | 08/28/2007 |
| 7216522 | Extruding and pipe press A metal extrusion press has a pair of fixed crossheads spaced along a press axis from each other and a plurality of elongated upper and lower members extending axially between and rigidly connected to the crossheads. Each member includes a rod axially tensioned betw... | 05/15/2007 |
| 7146836 | Piercing method for manufacturing of seamless pipe A piercing method for manufacturing a seamless pipe capable of suppressing the rotary forging effects and suppressing the redundant shear strain without excessive narrowing of the roll diameter is provided. This method is characterized by holding a feed angle β and... | 12/12/2006 |
| 7100410 | Method of manufacturing seamless tube A method of manufacturing a seamless tube by the invention can duly control the rotary forging effect without miss-rolling such as defective onset engagement with rolls by satisfying either of (1)–(3) formulas below, dependent on a given range of roll diameter rat... | 09/05/2006 |
| 6988387 | Making method for seamless metallic tube The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumfere... | 01/24/2006 |
| 6976377 | Method of and apparatus for producing tubes of metal In the planetary skew rolling blooms to form seamless metal tubing or pipe the internal tool is retracted at the leading and/or trailing end of the tubular bloom to allow the rolls to seal the end or ends and prevent coolant from entering the rolled tubing or bloom.... | 12/20/2005 |
| 6920773 | Method and apparatus for manufacturing tubes by rolling A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, by rolling, in which method, in the first working step the tube billet is worked by rolling with conical rolls, so that mainly owing to the deformation resis... | 07/26/2005 |
| 6904779 | Method of manufacturing a heat exchanger tube with parallel fins A method of forming a finned tube in which the fins are planar, paralleled and extend radially to the tube longitudinal axis, including the steps of positioning at least one rotating forming roll against the tube exterior surface, the forming roll being spaced from ... | 06/14/2005 |
| 6260396 | 2-Roll piercing mill and method of producing hollow blocks from high alloy steels A 2-roll piercing mill for producing hollow blocks from a rolled material comprising high alloy steels has guide tools for the rolled material. The guide tools are arranged for closing a reforming zone of the piercing mill transversely with respect to the... | 07/17/2001 |
| 6253593 | Piercer roll exchanging apparatus for vertical piercing mill and piercer roll exchanging method A piercer roll exchanging apparatus for use in a vertical piercing mill, as well as a piercer roll exchange method for use with the apparatus, which can automate the exchange of piercer rolls and which are suitable for flexible manufacture of small quanti... | 07/03/2001 |
| 6227024 | Flow forming method and device A flow-forming device includes a forming device having a cage in which a plurality of rolling members are rotatably arranged in ring-like manner about a rotation axis. A spinning chuck is configured to hold a blank so as to be axially displaceable relativ... | 05/08/2001 |
| 6202463 | Plug and mandrel bar for seamless steel pipe rolling operation for manufacturing seamless steel pipe This invention provide a plug and a mandrel bar for use in rolling a seamless steel pipe of which life can be substantially improved more than that of the prior art under a severe condition of use always exposed to a high temperature and high load. The en... | 03/20/2001 |
| 6142001 | Cylindrical shell for use in gas cylinder fabrication A method of producing a cylindrical shell in which a billet of circular, transverse cross-section is provided with of first and second sections formed of steel and a liner insert material, respectively. The first section has an end portion and a recess de... | 11/07/2000 |
| 6089066 | Process for the production of seamless tubes A process for producing a hollow billet for producing tubing for antifriction bearings includes massively reducing a bloom in a three-roll rotary piercing mill and subsequently piercing the reduced bloom in a three-roll rotary piercing mill. The reducing ... | 07/18/2000 |
| 6073331 | Method for manufacturing seamless pipe A method for manufacturing a seamless pipe, comprises: preparing a billet made of an alloy steel or an alloy; joining a steel plate to an end surface at which piercing of the billet is commenced; preparing a piercing plug made of Mo, a Mo alloy or a heat-resisting ... | 06/13/2000 |
| 6006570 | Method and device for producing a hollow body from solid round steel A method and a device for producing a hollow body from solid round steel that has been heated to shaping temperature by piercing in an inclined rolling mill using pass-closing guide elements. For this purpose, prior to the commencement of piercing, the cl... | 12/28/1999 |
| 5983689 | Lubricant for use in hot work A lubricant is provided for use in hot working such as cross-roll rolling of a seamless steel pipe. It effectively reduces the friction coefficient between the working tools and the material under the hot work, thus extending the lives of the tools. The l... | 11/16/1999 |
| 5816087 | Method for producing a seamless steel tubular product A seamless steel tubular product is produced by hot-piercing an alloy-steel billet with a piercing plug to produce a hollow shell and then rolling the hollow shell. Prior to the hot-piercing, a steel sheet is joined to an end surface of the billet into wh... | 10/06/1998 |
| 5778714 | Method for manufacturing seamless pipe A method for manufacturing a seamless pipe, comprises: preparing a billet made of an alloy steel or an alloy; joining a steel plate to an end surface at which piercing of the billet is commenced; preparing a piercing plug made of Mo, a Mo alloy or a heat-resisting ... | 07/14/1998 |
| 5713234 | Piercing-rolling method and piercing-rolling apparatus for seamless tubes A piercing and rolling method involves the use of a piercer provided with cone-shaped main rolls and disk rolls. When a piercing and rolling operation is performed at an expansion ratio of 1.15 or more, the following relations (1), (2), (3), (4), and (5) ... | 02/03/1998 |
| 5706689 | Single-piece self-guiding high mill plug A single-piece self-guiding, high integrity high mill plug for producing seamless tubular steel products in rolling mills is provided. The high mill plug is produced from a single a casting having a substantially bullet shape with an opening at each end a... | 01/13/1998 |
