Class / Patent application number | Description | Number of patent applications / Date published |
072095000 | And longitudinal movement of work | 32 |
20100326159 | BOTTLE CAN MEMBER, BOTTLE, AND THREAD FORMING DEVICE - An effective thread number in the thread section which is disposed on the mouth section of the bottle is formed to be 2.2. That is, the thread section is formed such that the thread section | 12-30-2010 |
20150367402 | Cold Rolling Devices and Colled Rolled Rotary Shouldered Connection Threads - A method of cold rolling a thread on a tubular support member of a rotary shouldered thread connection includes obtaining an original root depth of a thread root, cold rolling the thread until a minimum increased root depth tolerance is achieved. The thread may be cold rolled with a wheel tip having an elliptical profile. | 12-24-2015 |
072096000 | Using external rotating tool and internal core | 28 |
072097000 | Including work-piercing or work-expanding plug | 28 |
20080289388 | Piercing-rolling method and piercing-rolling apparatus for seamless tubes - [Objective] 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. | 11-27-2008 |
20080314109 | 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 R | 12-25-2008 |
20090038358 | Method of manufacturing seamless pipe and tube - It is a problem of the present invention to provide a method of manufacturing the seamless pipes having better mechanical properties, by means of a pipe manufacturing method with large energy-saving effect to continuously carry out processes from pierce-rolling to heat treatment. | 02-12-2009 |
20090038359 | 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 advancing speed of the billet is not less than the advancing speed of the billet when the piercing and rolling is carried out without pushing the billet forward by the pusher in the steady state. By this manufacturing method, inner surface defects at a tip end of a hollow shell can be restrained. | 02-12-2009 |
20090064748 | 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 gripping and a worsening of thickness deviations in the top portion of the hollow shell is also prevented is reliably produced with preventing miss-rolling such as incomplete billet gripping and troubles in bottom withdrawal and an increase in the outer diameter of the hollow shell in the bottom portion. A billet is pierced while being rotated and advanced to produce a hollow shell, from which a seamless tube is finally manufactured, using a pair of skew rolls, a pair of disk rolls, and a plug under such conditions that each of the ratio (Dg/d) of the diameter Dg of the gorge portion of the skew rolls and the outer diameter d of the billet, the ratio (Dd/d) of the diameter Dd of the groove bottom of the disk rolls and the outer diameter d of the billet, the ratio (Dd/Dg) of the diameter Dg and the diameter Dd, the inlet face angle θ | 03-12-2009 |
20090084151 | PROCESS FOR PRODUCING SEAMLESS STAINLESS STEEL PIPE - A process for producing seamless pipes which comprises conducting a piercing rolling step, a elongating rolling step using a mandrel bar, and a sizing rolling step and subsequently conducting a product heat treatment. In the process, when the carbon-equivalent weight, namely the sum of the weight of graphite in the lubricant and the carbon content in the organic binder, per unit area of the lubricant adhering to the mandrel bar surface in the above-mentioned step of elongating rolling is expressed by C (g/m | 04-02-2009 |
20090113970 | Method Of Making A Seamless Hollow Body From Steel - The invention relates to an apparatus for making a seamless hollow body ( | 05-07-2009 |
20090158799 | Metal Pipe and Manufacturing Method Thereof - A metal pipe according to the invention has a plurality of ridges that have different heights, extend in the axial direction, and are arranged in the circumferential direction at its inner circumferential surface. If the Reynolds number changes and the streak structure and the scale of a hairpin vortex change, the streak and the hairpin vortex each match any one of the ridges. Therefore, the fluid friction can be reduced in a wide Reynolds number range. | 06-25-2009 |
20090301155 | 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 root of the product of the plug tip draft (TDFT) are controlled along with the number of billet revolutions (N), namely (TDFT×N) | 12-10-2009 |
20090308125 | Mandrel mill and process for manufacturing a seamless pipe - A mandrel mill is provided which can perform elongation rolling with a markedly increased working ratio and dimensional accuracy on a material which is inherently difficult to roll such as a hollow shell made of stainless steel or a thin-walled material. A mandrel mill for manufacturing a mother tube by performing elongation rolling of a hollow shell comprises a plurality of roll stands, having at least one 4-roll stand for wall thickness reduction of a hollow shell and at least one 2-roll stand including the final stand downstream of the 4-roll stand. | 12-17-2009 |
20100050723 | 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 Fe | 03-04-2010 |
20100089111 | Piercer, Plug and Method of Manufacturing Seamless Pipe or Tube | 04-15-2010 |
20100107714 | PUSHER DEVICE FOR PIERCING AND ROLLING AND METHOD OF MANUFACTURING SEAMLESS PIPE OR TUBE USING THE SAME - A pusher device | 05-06-2010 |
20100139352 | METHOD FOR CR-PLATING OF MANDREL BARS, THE MANDREL BAR, AND PROCESS FOR PRODUCING SEAMLESS TUBES USING THE METHOD AND THE MANDREL BAR - By using a plating bath containing chromic acid: 100 to 250 g/L, sulfate radical: 3.0 to 5.5 g/L, and a catalyst: 100 to 200% (a weight ratio to the chromic acid content) for conducting electroplating, a Cr-plating film which has an increased film crack density is formed on the surface of a mandrel bar base metal, whereby peeling-off of the Cr-plating film can be suppressed in mandrel mill rolling for extending the service life of the mandrel bar. | 06-10-2010 |
20100175450 | METHOD OF PRODUCING SEAMLESS METAL TUBE AND PUNCH FOR USE THEREIN | 07-15-2010 |
20100263422 | LUBRICANT FOR HOT WORKING AND METHOD FOR PRODUCING SEAMLESS STEEL PIPE - There is provided a lubricant for hot plastic working, which contains 20 to 40 mass % of iron oxide and 10 to 30 mass % of sodium silicate, wherein impurities are 3 mass % or less, and the lubricant contains 40 to 60 mass % of water. By virtue of combined action of these components, the lubricant exhibits excellent lubricity and suppliability and does not adversely affect the corrosion resistance of product. The lubricant is suitably used for lubricating a guide shoe in piercing-rolling, for example, a high-Cr steel and achieves a great effect of preventing a seizure flaw from occurring on the outer surface of product by being applied directly to the outer surface of a workpiece just before piercing rolling, preferably, within one second before starting piercing rolling. | 10-21-2010 |
20110154876 | ROLLING MILL OF ROTATING EXPANDER TYPE FOR TUBULAR BODIES WITH TIP-STABILIZING SYSTEM - A rolling mill of rotating expander type for tubular bodies, comprising: working rollers ( | 06-30-2011 |
20130239637 | PROCESS FOR MANUFACTURING SEAMLESS STEEL PIPE, HOLLOW SPRING UTILIZING SEAMLESS STEEL PIPE - There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 μm or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step. | 09-19-2013 |
20130283879 | Ni BASE ALLOY PIPE STOCK AND METHOD FOR MANUFACTURING THE SAME - A method for manufacturing an Ni base alloy pipe stock comprises piercing and rolling a billet by use of Mannesmann piercing and rolling mill. The pipe stock has controlled amounts of C, Si, Mn, P, S, Cr, Ni, Mo, W, Cu, Al, N, with the balance being Fe. With the method, the following equations are satisfied, wherein values of T | 10-31-2013 |
20130327107 | HOT WORK TOOL AND METHOD FOR PRODUCING SAME - 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 ( | 12-12-2013 |
20130333433 | METHOD FOR PRODUCING SEAMLESS HOT-ROLLED PIPES IN CONTINUOUS PIPE ROLLING MILLS - In a method for producing seamless pipes, a hot hollow block created previously in a piercing mill is stretched by means of a continuous rolling mill on a mandrel bar to form a parent pipe and the parent pipe is fed directly to a stretch reducing mill or sizing mill as a finishing mill, while forgoing an extracting mill and a reheating furnace, and is rolled there to the required final pipe diameter. The hollow block is pre-dimensioned in its length in such a manner that only a single length is produced as the required parent pipe length during the stretching in the continuous rolling mill and the parent pipe is pulled off of the mandrel rod by the finishing rolling during the subsequent finishing rolling, wherein the rolling is performed using rolling mill components that are designed in the dimensions thereof for handling single lengths. | 12-19-2013 |
20140033781 | METHOD AND DEVICE FOR PRODUCING A HOLLOW METALLIC BILLET FROM A METALLIC BILLET - The present invention is directed to a method for producing a hollow metallic billet ( | 02-06-2014 |
20140250965 | METHOD OF PRODUCING SEAMLESS METAL PIPE - A method of producing a seamless metal pipe, which can suppress the occurrence of inner surface flaws, is provided. A method of producing a seamless metal pipe according to an embodiment of the present invention includes the steps of: heating a high alloy billet BL containing, by mass %, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a heating furnace F | 09-11-2014 |
20150075243 | PLUG USED IN PIERCING MACHINE - To increase the life of a plug used in a piercing machine for piercing-rolling a billet. The plug ( | 03-19-2015 |
20150107322 | ROUND BILLET FOR SEAMLESS METAL TUBE AND METHOD FOR PRODUCING SEAMLESS METAL TUBE - Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a Mannesmann process. The round billet ( | 04-23-2015 |
20150306646 | MANUFACTURING METHOD AND MANUFACTURING APPARATUS OF SEAMLESS METAL PIPE - A manufacturing method of a seamless metal pipe includes determining whether a preceding-stage stand group is used in outer diameter reduction or in thickness reduction of a hollow shell; and performing elongating on the hollow shell, into which a mandrel bar is inserted, based on the determination. In addition, in the elongating, when the preceding-stage stand group is used in the outer diameter reduction, the hollow shell is rolled in a state where an inner surface of the hollow shell does not come into contact with the mandrel bar in the preceding-stage stand group, and the hollow shell is rolled in a state where the inner surface of the hollow shell comes into contact with the mandrel bar in the succeeding-stage stand group. | 10-29-2015 |
20160053358 | PIERCING PLUG AND MANUFACTURING METHOD OF PIERCING PLUG - A piercing plug includes a plug main body, and a sprayed coating which is formed on a surface of the plug main body and includes iron and iron oxide. A chemical composition of the sprayed coating includes, in addition to the iron and the iron oxide, by mass %, C: 0.015% to 0.6%, Si: 0.05% to 0.5%, Mn: 0.1% to 1.0%, and Cu: 0 to 0.3%. | 02-25-2016 |
20160059285 | INTEGRATED TRANSVERSE ROLLING MILL FOR SEAMLESS TUBES - An integrated transverse rolling mill for rolling seamless tubes with skewed axes comprising a piercing stand ( | 03-03-2016 |
072099000 | Using hyperboloidal roller | 1 |
20120304724 | METHOD FOR STRAIGHTENING TUBE AND STRAIGHTENING ROLL - A method for straightening a tube by using an asymmetric roll, which has different diameters D | 12-06-2012 |
072100000 | Using tool-cluster | 1 |
20090056400 | METHOD AND APPARATUS FOR PRODUCING STEPPED HOLLOW SHAFTS OR STEPPED CYLINDRICAL HOLLOW MEMBERS BY TRANSVERSE ROLLING - The invention relates to a method and a device for transversely rolling stepped hollow shafts or cylindrical hollow parts from a pipe. The invention achieves the object of rolling stepped hollow shafts of the most varied dimensions and also of greater lengths in a flexible manner from a pipe using a small number of simple tools. In accordance with the invention, the object is achieved by virtue of the fact that rolling tools which can be radially advanced and are disposed in a planet-like manner around the workpiece are used to roll the contour of the transition from a central diameter in one portion of the workpiece to the central diameter in the adjacent portion by means of co-ordinated control of the radial advance of the rolling tools and the axial feed of the workpiece, and a mandrel head having an outer diameter which is adapted to the smallest inner diameter of the two portions is disposed underneath the rolling tools. | 03-05-2009 |