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| Number | Title | Issue Date |
| 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 |
| 7350386 | Method and apparatus for making tubes In a method of making a tube, a sheet metal blank is placed in a U-shaped cavity of a lower mold of a shaping tool, and pressed into the cavity by a ram to shape the blank into a U-shaped configuration. In a next process step, the U-shaped blank is formed between an... | 04/01/2008 |
| 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 |
| 7266872 | Method and device for the separation of tubes An apparatus and method for separation of tubes produced continuously on a row of mandrels, continuously coupled to one another, by the mandrels being advanced in a conveying direction (X) and by material layers being applied to the mandrels. A material difference e... | 09/11/2007 |
| 7197906 | Cold rolling process for metal tubes In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the pass schedule factors such as the Area Rd, ID Rd and the feed rate F of the workpiece material, and further by properly... | 04/03/2007 |
| 7188501 | Cold rolling process for metal tubes In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the mandrel factors like the taper θ1 in the primary deformation zone of the mandrel and the taper θ2 in th... | 03/13/2007 |
| 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 |
| 6923035 | Method and apparatus for forming a modified conduit A conduit modifier may be used to corrugate at least a portion of a conduit. The conduit modifier may include at least a first plurality of rollers arranged in a first pattern around a passageway. The first plurality of rollers may form ridges and grooves lengthwise... | 08/02/2005 |
| 6718811 | Process for producing a guide tube of a nuclear reactor fuel assembly, mandrel for forming the guide tube, and the guide tube obtained A tubular blank (22) is rolled on a mandrel (14) in a pilgrim rolling mill. In a first rolling stage, a first part of the blank (22) is rolled on a first part (18,19) of the mandrel (14), with a reduction of the outside diameter of... | 04/13/2004 |
| 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 |
| 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 |
| 6158262 | Piercing mill and cannon exchange method A piercing mill and cannon exchange method therefor which can automate exchange of a cannon and can cope with flexible production of a variety of differently-sized seamless steel tubes in small quantities. The piercing mill including means for pivoting a ... | 12/12/2000 |
| 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 |
| 5829296 | Method and device for placing plugs on a plug mill A method and device for placing plugs on plug mills, in which, after the completed rolling of a tube, the plug is freed from bearing against a plug rod and, owing to its weight, moves downward out of the rolling line, is recooled and is raised again into ... | 11/03/1998 |
| 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 |
| 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 |
| 5657659 | Mandrel mill and method of tube rolling by using the same In a mandrel mill for elongating and rolling a hollow shell, with a mandrel bar inserted, by passing the hollow shell, a four-roll stand for diameter reduction used to reduce only the outer diameter of the hollow shell is disposed as the first stand, a gr... | 08/19/1997 |
| 5584203 | Rolling mandrel changing device for a plug mill A device for changing the rolling mandrels of a plug mill. The device including the following arrangement of stations in series. An entry station for feeding the rolling mandrels into the feeding channel of the plug mill, a run-out station for the used ro... | 12/17/1996 |
| 5412974 | Method of producing seamless pipes utilizing a plug rolling procedure A method of producing seamless pipes by carrying out a plug rolling procedure includes expanding and stretching a hollow ingot into a bloom by carrying out at least two consecutive passes in a roll stand having a box-groove and by using a stationary plug ... | 05/09/1995 |
| 5357773 | Method of longitudinal rolling of seamless pipe A method of longitudinal rolling of seamless pipes in a continuous rolling procedure on an internal tool in a multiple-stand rolling train, wherein the rolls of successive rolling stands are mounted off set relative to each other. In accordance with the p... | 10/25/1994 |
| 5031434 | Plug for manufacturing seamless steel pipe A plug for manufacturing a seamless steel pipe is disclosed. The plug includes the surface layer made of molybdenum or molybdenum base alloy coming in contact with a workpiece to be drilled and the core covered with the surface layer. The surface of the c... | 07/16/1991 |
| 5022250 | Method of pilgrim step rolling A method of pilgrim step rolling of elongated stock includes reciprocating a roll stand or frame for moving the stock either by rotating it and/or advancing it; such a method is improved by providing a first component of movement at a constant speed and a... | 06/11/1991 |
| 5016456 | Process for making hollow billets into tubes Hollow billet (13) in a first operation of a piercing mill (1, 2) is advanced over a piercer (10) placed on front end (5) of a piercer rod (6) and is retracted after removal of the piercer. During the advance of hollow billet (13) a lubricant is applied t... | 05/21/1991 |
| 4866968 | High strength cemented carbide dies and mandrels for a pilgering machine Pilger tooling for use in a pilgering machine includes an elongated stationary mandrel for supporting a tube thereon in position for cold reduction, and a pair of roller dies positioned along opposing sides of the mandrel and in oppositely-facing relation... | 09/19/1989 |
| 4794776 | Load-bearing structure for a continuous rolling mill for seamless tube making A continuous rolling mill for producing seamless tubes, operating on the restrained mandrel principle, has a stand-less structure which includes a load-bearing box-type framework wherein there are formed seats for accommodating working rolls and their cho... | 01/03/1989 |
| 4727740 | Thermal and wear resistant tough nickel based alloy guide rolls This invention relates to the thermal and wear resistant, tough alloy at elevated temperatures. The alloy consists essentially of carbon, chromium, iron, titanium, aluminum, tungsten, molybdenum, silicon, manganese, cobalt and balance nickel, further the ... | 03/01/1988 |
| 4592222 | Device for the delivery and removal of the mandrel rods in skew and longitudinal rolling mills An apparatus for delivery and removal of mandrel rods for use with rolling mills. A plurality of rocking levers are arranged one behind the other in the direction of rolling and are pivotable into upper and lower positions. Free ends of the levers are pro... | 06/03/1986 |
| 4571970 | Rolling mill plant for the manufacture of seamless tubes In a rolling mill plant for the manufacture of seamless tubes, a piercing mill (2), a planetary skew rolling mill (15) and a sizing or stretch-reducing rolling mill (18) are arranged one after the other. In order to improve the output and the quality of t... | 02/25/1986 |
| 4503698 | Apparatus for supporting the piercing mandrel back-up bar of a press-piercing rolling mill Apparatus is provided for supporting the mandrel back-up bar of a press-piercing rolling mill. The apparatus comprises a plurality of constraining elements supported by a base in two lines disposed parallel to and symmetrically with respect to the rolling... | 03/12/1985 |
| 4488421 | Mandrel-carrier head for a restrained-mandrel continuous rolling mill A mandrel-carrier head for fixed-mandrel continuous rolling mill has a horizontal hook portion engageable with the tail of the mandrel. This portion has a U-section in the direction of the rolling axis. One of the limbs or a part thereof is movable toward... | 12/18/1984 |
| 4470285 | Billet centering and control guide for the entry guide of a press-piercing mill A billet centering and control guide for an entry guide for a PPM, which is of the rectilinear-tunnel type and is formed by two L-shaped portions which are hinged together about an axis parallel to the axis of the guide. The control guide can be opened es... | 09/11/1984 |
| 4466265 | Compound tool for hot-working The compound tool is made from a powder-metallurgically-prepared portion, establishing the wear-resisting zones onto which a carrier body is cast from steel.... | 08/21/1984 |
| 4455849 | Press-rolling process for producing a metal tubular product In a press-rolling process for producing a metal tubular product, which comprises a pipe-forming procedure in which a square metal billet is fed into a rolling mill which consists of a pair of pressing rolls which have semi-circular grooves forming circul... | 06/26/1984 |
| 4428222 | Cold forging mandrel with threads A mandrel for the production of internally threaded tubes or cylinders by the cold forging of a forging blank (3) around an externally threaded mandrel (2). The mandrel is formed with a conicity of 0.2-1.0% or preferably 0.4-0.7% and the flanks of the man... | 01/31/1984 |
| 4406143 | Return pass practice for the high mill of a seamless-pipe mill A pierced billet is fed to a plug rolling mill, wherein the first rolling pass is effected in conventional manner, i.e. the shell is rammed over a forming plug mounted on the front end of the mandrel and then drawn over the plug by the work-rolls. Rather ... | 09/27/1983 |
| 4404832 | Operating a rolling mill working on seamless tubing It was discovered that a rolling mandrel holding a hollow which is rolled in a multistrand mill should be advanced in a particular manner that relates to the stretching the hollow undergoes in the first and second stand, as well as to the speed of the unr... | 09/20/1983 |
| 4395897 | Rolling head support assembly for a rolling mill In a rolling mill having a perforating head supported on a bar which is rotatable and longitudinally displaceable, the bar is supported on a carriage by way of a gripper fixed to the carriage and engaging a recess in the bar with sufficient radial play to... | 08/02/1983 |
| 4393677 | Plugs for use in piercing and elongating mills A plug for use in a piercing and elongating mill characterizing in that an adherent durable surface layer consisting essentially of iron oxides, i.e. FeO, Fe3 O4, Fe2 O3 or mixtures thereof is formed on the surf... | 07/19/1983 |
| 4361023 | Mandrel-restraining assembly for a tube-rolling mill A restraining assembly for holding back and then releasing a mandrel which supports a tube being rolled in a rolling mill has a fork supported by a carriage which is driven by two endless chains. The carriage is articulated to two opposite links of the ch... | 11/30/1982 |
| 4353238 | Method for manufacture of seamless metal tubing by continuous rolling A method for hot rolling of a tubular blank over a mandrel in a mill utilizing a plurality of roll stands. The blank and mandrel are inserted into the mill and moved through the mill in a fashion such that the mandrel is present and controlled at each rol... | 10/12/1982 |
