Patents by Inventor Rolf Kümmerling
Rolf Kümmerling has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10695809Abstract: A method for producing hot-rolled, seamless pipes having at least one wall thickening which can be arranged at any positions over the length of the pipe, wherein by means of a multiple-stand mandrel bar rolling mill, the rolls roll a hollow shell on a mandrel bar as an inner tool to a required nominal wall thickness and produce at specified positions over the length of the pipe a required wall thickening on the outer side of the pipe by opening the rolls in the rolling stands. The thickened wall is produced and finish-rolled by two rolling stands that are consecutive as seen in the rolling direction, in which the deviations of the finished contour of the thickening from an ideal circular cross-section are minimised, wherein the rolling stands located upstream are likewise opened as to avoid any contact of the rolls of these rolling stands with the previously produced thickening.Type: GrantFiled: July 28, 2015Date of Patent: June 30, 2020Assignee: Vallourec Deutschland GmbHInventors: Rolf Kümmerling, Henrike Bröker, Thorsten Anke
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Patent number: 10239102Abstract: A rolling rod configured as an inner tool in the production of seamless hollow bodies, such as seamless pipes. The rolling rod has a nitrided surface layer and may consist of a heat-resistant steel material having a chromium equivalent calculated by a formula, as well as has a minimum hardness, yield point and tensile strength. A seamlessly hot-rolled, metallic hollow body is produced by a stretch-forming procedure in a multiple-stand rolling mill via the rolling rod which is threaded into the hollow block. Prior to threading the rolling rod into the hollow block, the rolling rod is provided with a liquid lubricant and is subsequently dried. The rolling rod is threaded in with a clearance with respect to the inner diameter of the hollow block. Prior to threading-in the rod, the hollow block may have an average temperature of at least 1000° C., with the rod having a determined speed.Type: GrantFiled: January 5, 2015Date of Patent: March 26, 2019Assignee: Vallourec Deutschland GmbHInventors: Nils Schäfer, Rolf Kümmerling, Stéphanie Demars, Hélène Dalmont
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Patent number: 10100384Abstract: A method for producing a tempered, seamlessly hot-rolled steel pipe includes heating a hollow block to forming temperature and rolling the heated block in a rolling mill to form a pipe with a finished diameter after rolling. Subsequently, the pipe is tempered with appropriate tempering parameters after rolling whereby the diameter of the pipe increases during tempering. The finished diameter of the pipe to be tempered after rolling in the rolling mill is adjusted as a function of a value of the growth in diameter of the pipe during tempering.Type: GrantFiled: August 11, 2014Date of Patent: October 16, 2018Assignee: Vallourec Deutschland GmbHInventors: Christof Delhaes, Heiko Hansen, Rolf Kuemmerling
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Patent number: 9937540Abstract: A piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, having a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar. The outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal direction towards the piercing mandrel main body in order to increase the durability of the piercing mandrel when used for piercing round blocks of metal, in particular higher-alloyed steel materials which are difficult to work, by means of skew rolling providing a qualitative improvement of the inner surface of the pierced round block and reducing tool costs.Type: GrantFiled: September 22, 2014Date of Patent: April 10, 2018Assignee: Vallourec Deutschland GmbHInventors: Winfried Braun, Christian Klempel, Rene Baadjou, Rolf Kümmerling
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Publication number: 20170216896Abstract: A method for producing hot-rolled, seamless pipes having at least one wall thickening which can be arranged at any positions over the length of the pipe, wherein by means of a multiple-stand mandrel bar rolling mill, the rolls roll a hollow shell on a mandrel bar as an inner tool to a required nominal wall thickness and produce at specified positions over the length of the pipe a required wall thickening on the outer side of the pipe by opening the rolls in the rolling stands. The thickened wall is produced and finish-rolled by two rolling stands that are consecutive as seen in the rolling direction, in which the deviations of the finished contour of the thickening from an ideal circular cross-section are minimised, wherein the rolling stands located upstream are likewise opened as to avoid any contact of the rolls of these rolling stands with the previously produced thickening.Type: ApplicationFiled: July 28, 2015Publication date: August 3, 2017Applicant: Vallourec Deutschland GmbHInventors: Rolf Kümmerling, Henrike Bröker, Thorsten Anke
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Publication number: 20160376677Abstract: A method for producing a tempered, seamlessly hot-rolled steel pipe includes heating a hollow block to forming temperature and rolling the heated block in a rolling mill to form a pipe with a finished diameter after rolling. Subsequently, the pipe is tempered with appropriate tempering parameters after rolling whereby the diameter of the pipe increases during tempering. The finished diameter of the pipe to be tempered after rolling in the rolling mill is adjusted as a function of a value of the growth in diameter of the pipe during tempering.Type: ApplicationFiled: August 11, 2014Publication date: December 29, 2016Applicant: Vallourec Deutschland GmbHInventors: Christof Delhaes, Heiko Hansen, Rolf Kuemmerling
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Publication number: 20160346820Abstract: A piercing mandrel for piercing heated round blocks of metal for the production of seamless pipes, having a piercing mandrel nose and a piercing mandrel main body which can be connected to a mandrel bar. The outer diameter of the piercing mandrel nose is formed in a conically tapering manner in the longitudinal direction towards the piercing mandrel main body in order to increase the durability of the piercing mandrel when used for piercing round blocks of metal, in particular higher-alloyed steel materials which are difficult to work, by means of skew rolling providing a qualitative improvement of the inner surface of the pierced round block and reducing tool costs.Type: ApplicationFiled: December 12, 2014Publication date: December 1, 2016Inventors: Winfried Braun, Christian Klempel, Rene Baadjou, Rolf Kümmerling
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Patent number: 9381554Abstract: 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.Type: GrantFiled: September 19, 2011Date of Patent: July 5, 2016Assignee: VALLOUREC DEUTSCHLAND GMBHInventors: Rolf Kümmerling, Christoph Prasser, Gerd Homberg, Frank Hagemann, Gabriel Pereira, Winfried Braun
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Patent number: 9248483Abstract: A device for the optimized circulation of mandrels includes a presentation and/or cooling table for mandrel rods, a lubricating station for the mandrel rods, optionally an additional drying station for the lubricant applied to the mandrels, and associated roller conveyors. An additional secondary rod circulation of is arranged upstream of the standard rod circulation and includes two redundantly operating transfer tables connected to the presentation and/or cooling table by a third roller conveyor or the first roller conveyor for the discharge of no longer needed rods from the standard rod circulation. The third roller conveyor either forms the continuation of the first roller conveyor or is arranged parallel thereto with an offset. A fourth roller conveyor for accommodating mandrel rods or passing mandrel rods intermittently into the standard circulation via an intermediate buffer is arranged on the opposite side of the transfer tables parallel to the first roller conveyor.Type: GrantFiled: October 25, 2010Date of Patent: February 2, 2016Assignee: VALLOUREC DEUTSCHLAND GMBHInventors: Rolf Kümmerling, Frank Hagemann, Gabriel Moniz Pereira, Nils Schäfer, Ken Johnson, Brad Chamberlain
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Patent number: 9056341Abstract: The invention relates to a method for producing seamless tubes from metal, particularly from steel, wherein a previously produced hot hollow block is stretched by means of a three-roll bar rolling mill on a mandrel to form a parent tube and, before running into the bar rolling mill, the hollow block is provided with a rolling step that makes the diameter more uniform by means of an upstream stand. It is in this case provided that the rolls of the upstream stand are moved apart and together to the same extent as the deforming stands of the bar rolling mill, wherein the calibrating base radius of the rolls of the upstream stand extends over 60° and this is followed by a flank radius with a tangential transition which is dimensioned such that even with the maximum setting of the rolls in the region of the flank there is virtually no diameter reduction of the largest hollow block diameter to be expected.Type: GrantFiled: November 20, 2009Date of Patent: June 16, 2015Assignee: V & M DEUTSCHLAND GmbHInventors: Rolf Kümmerling, Manfred Bellmann, Winfried Braun, Hidenori Kinugasa, Sasaki Kenichi
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Publication number: 20130333433Abstract: 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.Type: ApplicationFiled: September 19, 2011Publication date: December 19, 2013Applicant: V & M Deutschland GmbHInventors: Rolf Kümmerling, Christoph Prasser, Gerd Homberg, Frank Hagemann, Gabriel Pereira, Winfried Braun
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Patent number: 8316680Abstract: The invention relates to an apparatus for making a seamless hollow body (10) from a solid round block (7) of steel with a diameter <95% of the diameter of the solid round block by means of a two-roll cross-rolling mill with a piercing mandrel (3) held between the inclined roll (1) and including a piercer (5) and at least one smoothing part (4) using pass-closing guides, or by means of a three-roll cross rolling mill with a piercing mandrel held between the inclined rolls and including a piercer and at least one smoothing part, wherein the distance of the rolls is adjusted in a particular manner at the narrowest cross-section (2) in relation to the diameter of the used round block, and the position of the piercing mandrel is adjusted in relation to the narrowest cross-section of the rollers.Type: GrantFiled: June 15, 2006Date of Patent: November 27, 2012Assignee: V&M Deutschland GmbHInventors: Rolf Kümmerling, Gunther Manig
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Publication number: 20120272704Abstract: A device for the optimized circulation of mandrels includes a presentation and/or cooling table for mandrel rods, a lubricating station for the mandrel rods, optionally an additional drying station for the lubricant applied to the mandrels, and associated roller conveyors. An additional secondary rod circulation of is arranged upstream of the standard rod circulation and includes two redundantly operating transfer tables connected to the presentation and/or cooling table by a third roller conveyor or the first roller conveyor for the discharge of no longer needed rods from the standard rod circulation. The third roller conveyor either forms the continuation of the first roller conveyor or is arranged parallel thereto with an offset. A fourth roller conveyor for accommodating mandrel rods or passing mandrel rods intermittently into the standard circulation via an intermediate buffer is arranged on the opposite side of the transfer tables parallel to the first roller conveyor.Type: ApplicationFiled: October 25, 2010Publication date: November 1, 2012Applicant: V & M DEUTSCHLAND GMBHInventors: Rolf Kümmerling, Frank Hagemann, Gabriel Moniz Pereira, Nils Schäfer, Ken Johnson, Brad Chamberlain
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Publication number: 20120125068Abstract: The invention relates to a method for producing seamless tubes from metal, particularly from steel, wherein a previously produced hot hollow block is stretched by means of a three-roll bar rolling mill on a mandrel to form a parent tube and, before running into the bar rolling mill, the hollow block is provided with a rolling step that makes the diameter more uniform by means of an upstream stand. It is in this case provided that the rolls of the upstream stand are moved apart and together to the same extent as the deforming stands of the bar rolling mill, wherein the calibrating base radius of the rolls of the upstream stand extends over 60° and this is followed by a flank radius with a tangential transition which is dimensioned such that even with the maximum setting of the rolls in the region of the flank there is virtually no diameter reduction of the largest hollow block diameter to be expected.Type: ApplicationFiled: November 20, 2009Publication date: May 24, 2012Applicant: V & M Deutschland GmbHInventors: Rolf Kümmerling, Manfred Bellmann, Winfried Braun, Hidenori Kinugasa, Sasaki Kenichi
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Patent number: 8166792Abstract: In a method of making a seamless hot-finished steel pipe a billet heated to a shaping temperature is pierced by a first shaping to a thick-walled hollow ingot which subsequently undergoes a radial forging process using an internal tool inserted in the hollow ingot and at least two forging jaws of a forging machine. The forging jaws act on the outer surface area of the hollow ingot, wherein the hollow ingot is turned and axially advanced in a clocked manner in the idle stroke phase of the forging jaws.Type: GrantFiled: October 25, 2005Date of Patent: May 1, 2012Assignee: V & M Deutschland GmbHInventors: Christoph Prasser, Rolf Kümmerling, Stefan Wiedenmaier, Pierre Lefebvre, Rupert Wieser, Robert Koppensteiner
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Publication number: 20100251794Abstract: The invention relates to a forging mandrel for hot-forging tubular workpieces of metal, said mandrel comprising a mandrel body and a mandrel bar, in which forging mandrel the mandrel body is composed of a heat-resistant material. The forging mandrel according to the invention is embodied here in such a way that the mandrel body is provided, at least in the work zone, with a layer which reduces the dissipation of heat into the mandrel body during the forging process and adheres firmly to the mandrel body, wherein the layer has a lower thermal conductivity than the material of the mandrel body and has a thickness of at least 50 ?m.Type: ApplicationFiled: June 25, 2008Publication date: October 7, 2010Applicant: V & M DEUTSCHLAND GMBHInventors: Stefan Wiedenmaier, Rolf Kümmerling, Gerd Homberg, Pierre Lefebvre
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Publication number: 20090113970Abstract: The invention relates to an apparatus for making a seamless hollow body (10) from a solid round block (7) of steel with a diameter <95% of the diameter of the solid round block by means of a two-roll cross-rolling mill with a piercing mandrel (3) held between the inclined roll (1) and including a piercer (5) and at least one smoothing part (4) using pass-closing guides, or by means of a three-roll cross rolling mill with a piercing mandrel held between the inclined rolls and including a piercer and at least one smoothing part, wherein the distance of the rolls is adjusted in a particular manner at the narrowest cross-section (2) in relation to the diameter of the used round block, and the position of the piercing mandrel is adjusted in relation to the narrowest cross-section of the rollers.Type: ApplicationFiled: June 15, 2006Publication date: May 7, 2009Applicant: V & M DEUTSCHLAND GMBHInventors: Rolf Kümmerling, Gunther Manig
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Patent number: 4848124Abstract: Seamless tubing and pipes are made from solid rounds with a diameter not exceeding 0.8 of the diameter of the tubing or pipe to be made; the method includes the steps of piercing the solid with a mandrel such that a conical widening angle at the end of piercing has a particular value; a smoothing step is provided downstream from the piercing also with a particular cone angle; and between the piercing and the smoothing of the now pierced hollow is widened under reduction of the wall thickness at a conical angle of widening that is larger (blunter) than the widening angle of piercing and the particular cone angle.Type: GrantFiled: March 24, 1988Date of Patent: July 18, 1989Assignee: Mannesmann AGInventors: Horst Biller, Manfred Bellmann, Wilhelm Nickel, Rolf Kuemmerling
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Patent number: 4803861Abstract: A pierced hollow rolled by obliquely positioned conical or barrel-shaped rolls, is held against excessive ovality by driven guide sheaves or disks acting in combination with guide bars downstream for controlling the rate of radial widening of the hollow. Oblique positions of the axes of the disks permits them to be of larger diameter.Type: GrantFiled: January 16, 1987Date of Patent: February 14, 1989Assignee: Mannesmann AGInventors: Rolf Kuemmerling, Manfred Mueller, Klaus-Peter Schirmag, Wilhelm Nickel