| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 072208000 | With tool inside hollow work | 26 |
| 20090038360 | Method for producing ultra thin wall metallic tube with cold working process - An exemplary embodiment of the invention provides a method for producing an ultra thin wall metallic tube by cold working method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill according to the invention, cold rolling is performed while tube diameters are being expanded using rolls having tapered groove dies whose calibers increase from an engaging entry side toward a finishing exit side. In a method for producing the metallic tube with a drawing machine according to the invention, cold drawing is performed while the tube diameters are being expanded using a solid die whose calibers increase from an engaging entry side toward a finishing exit side and a plug of a tapered mandrel bar whose diameters increase from an entry side of the die toward an exit side. In the metallic tube producing method, a maximum diameter of the plug or tapered mandrel bar may be larger than an outside diameter of the mother tube. | 02-12-2009 |
| 20090064749 | PROCESS FOR PRODUCING STAINLESS STEEL PIPE - A process for stainless-steel pipe production which comprises piercing rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together with a graphite-free lubricant, to give a finishing rolling blank pipe and heating the blank pipe in a reheating furnace and subjecting the same to finishing rolling by sizing rolling to produce a hot-finished pipe, and then subjecting this pipe as a mother pipe to cold working to produce a stainless-steel pipe. In the reheating furnace, the finishing rolling blank pipe is heated to 1000° C. or more and subjected to heating in which an oxidizing gas is blown into the pipe inside, whereby a stainless-steel pipe which is inhibited from forming a carburized layer in the pipe inner surface can be produced. When the finishing rolling by sizing rolling to give a cold working mother pipe is carried out by stretch reducer rolling at 860-1050° C., an annealing heat treatment of the mother pipe for cold working can be omitted. Thus, a stainless-steel pipe having excellent surface quality can be efficiently produced. | 03-12-2009 |
| 20090145193 | METHOD FOR PRODUCING ULTRA THIN WALL METALLIC TUBE BY COLD ROLLING METHOD - An aspect of the present invention provides a method for producing an ultra thin wall metallic tube by a cold rolling method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill, a wall thickness is reduced to perform elongation while a wall thickness center diameter is expanded using a pair of rolls, which has a tapered groove die whose diameter is gradually expanded or reduced from an engaging inlet side of the roll toward a finishing outlet side thereof, and a tapered mandrel bar, whose diameter is gradually expanded from an engaging inlet side of the tapered mandrel bar toward a finishing outlet side thereof. | 06-11-2009 |
| 20100064753 | MANDREL MILL, OPERATING METHOD OF THE SAME AND PRODUCTION METHOD OF SEAMLESS PIPE - The object of the present invention is to provide a mandrel mill capable of producing a seamless pipe without flaws such as necking. The mandrel mill of the present invention includes a plurality of consecutively provided grooved-roll stands and a mandrel bar | 03-18-2010 |
| 20100132425 | MANDREL MILL, OPERATING METHOD OF THE SAME AND PRODUCTION METHOD OF SEAMLESS PIPE - The object of the present invention is to provide a mandrel mill capable of producing a seamless pipe without flaws such as necking. The mandrel mill of the present invention includes a plurality of consecutively provided grooved-roll stands and a mandrel bar | 06-03-2010 |
| 20110079066 | METHOD FOR PRODUCING AN INTERNALLY OR EXTERNALLY TOOTHED CUP-SHAPED SHEET MATERIAL COMPONENT AND CORRESPONDING DEVICE - A method and a device for producing an internally or externally toothed cup-shaped sheet material component with teeth that run in parallel to the center axis of the cup, especially of a clutch plate carrier. The method and device allow the production of profile rollers, the rollers controlling the true running, dimensional accuracy and the surface of the cup-shaped sheet material component having an internally and externally profiled wall in the shape of teeth, in such a manner that they guarantee a specifically variable position during production. The method is characterized in that an untoothed cup-shaped sheet material component is slid onto a pick-up mandrel which has an external toothing corresponding to the internal toothing of the sheet material component to be produced and the external profile is then rolled onto the cup-shaped sheet material component by pressing the cup-shaped sheet material component together with the pick-up mandrel by means of a set of profile rollers rolling off in parallel to the center axis on the sheet material component while exerting a radial pressure. This results in pressing the material into the grooves of the pick-up mandrel, and a displacement of every profile roller of the set of profile rollers toward the pick-up mandrel taking place in the region of the open end of the cup-shaped sheet material component to be formed. This process thereby forms the desired profile of the internally and externally toothed region at the open end of the sheet material component due to a pressure relief, and removal of the sheet material component so treated. | 04-07-2011 |
| 20110219839 | Tubular member having multiple sized splines - A driveshaft assembly includes a tubular slip member having a first spline member having a plurality of splines formed thereon having a first tolerance and a second spline member having a plurality of spline sections. The plurality of spline sections includes a plurality of splines formed thereon having a second tolerance. The second spline member cooperates with the first spline member. A zone is disposed on the second spline member and has a first profile. The zone is disposed adjacent to at least one of the plurality of spline sections of the second spline member, and the first profile defines a clearance relative to the first spline member. | 09-15-2011 |
| 20110277526 | Mandrel Holder Head With Release Device - A mandrel holder head with release/fastening device of the mandrel for rolling metallic tubes comprises a mandrel holder ( | 11-17-2011 |
| 20120079864 | PILGER DIE AND PILGER MANDREL FOR MANUFACTURING DASHPOT TUBE FOR NUCLEAR FUEL ASSEMBLY, METHOD OF MANUFACTURING THE PILGER DIE AND THE PILGER MANDREL, AND DASHPOT TUBE FOR NUCLEAR FUEL ASSEMBLY - A pilger die and a pilger mandrel which are used to produce a dashpot tube which can be used in a nuclear fuel assembly having an outer diameter of 31.75 mm or less and an inner diameter 25.654 mm or less, by processing a reduced expression zirconium alloy tube in two pilgering processes (a first step pass and a second step pass) using a single pilgering apparatus. Furthermore, provided are methods of manufacturing the pilger die and the pilger mandrel, and the dashpot tube for the nuclear fuel assembly. The dashpot tube can be manufactured by the single pilgering apparatus provided with the pilger die and the pilger mandrel. | 04-05-2012 |
| 20120174646 | RETRACT MANDREL MILL AND METHOD FOR ROLLING TUBE BLANK - A retract mandrel mill, comprising a mandrel mill and an extractor, the mandrel mill including a mandrel bar and being configured to roll a tube blank into which the mandrel bar is inserted, the extractor being configured to extract the mandrel bar from the tube blank that has been rolled in the mandrel mill, wherein the distance between the mandrel mill and the extractor is adjustable, and a method for rolling a tube blank by using the retract mandrel mill. As the result of the adjustable distance, even when a tube blank which is shorter than usual is rolled, there is no need to add an extra extension to the length of the tube blank to be elongation-rolled, and the wear of the mandrel bar can be suppressed so that the tube blank can be rolled efficiently and with high yields. | 07-12-2012 |
| 20120285215 | DEVICE AND METHOD TO SHAPE WORKED PIECES - A device to process a blank ( | 11-15-2012 |
| 20120312062 | DEVICE AND METHOD FOR ROLLING OF PIPE BLANKS - A device for rolling of pipe blanks has a planetary cross-rolling mill, an advancing bed, a pipe blank feed, a pipe blank advancing unit that pushes the pipe blanks through the planetary cross-rolling mill, proceeding from the advancing bed, the unit having at least one advancing apparatus, and having a mandrel rod and a mandrel rod holder. The pipe blank feed has an axial pipe blank conveying unit that conveys a pipe blank axially into a readiness position, which is provided axially behind the mandrel rod holder. The advancing apparatus is disposed between the planetary cross-rolling mill and the mandrel rod holder, and has a slide. | 12-13-2012 |
| 20130008219 | MANDREL CONVEYING DEVICE FOR A TUBE ROLLING MILL - A rolling plant (R) for rolling tubes having a multi-stand rolling mill ( | 01-10-2013 |
| 20130255342 | METHOD FOR PRODUCING SEAMLESS TUBE/PIPE - By using a piercing mill that includes a pusher on the entrance side, a plug on the exit side along a pass line, and a plurality of angled rolls as being provided around the plug so as face to each other, in the case where the maximum diameter of an unsound region consisting of center segregation and porosity in a cross section of a billet is d [mm], piercing-rolling is performed under the condition that the plug nose rolling reduction ratio (TDF) expressed by Formula (1) satisfies Formula (2). | 10-03-2013 |
| 20140096580 | ROLLING STAND WITH THREE WORKING ROLLS - A rolling stand ( | 04-10-2014 |
| 20150027190 | METHOD AND DEVICE FOR ROLL-FORMING WORKPIECES - A method for producing workpieces wherein a substantially rotationally symmetrical workpiece ( | 01-29-2015 |
| 20150121982 | MANUFACTURING METHOD OF SEAMLESS METAL PIPE, MANDREL MILL, AND AUXILIARY TOOL - A manufacturing method of a seamless metal pipe includes: preparing a plurality of mandrel bars in which lengths of work portions which come into contact with a hollow shell during elongating are different from one another; selecting a mandrel bar including a work portion having a length corresponding to the number of stands used in thickness reduction, among the plurality of mandrel bars; inserting the mandrel bar selected in the selecting into the hollow shell; and performing the elongating on the hollow shell into which the mandrel bar is inserted. Moreover, in the elongating, outer diameter reduction is performed by one of a preceding-stage stand group and a succeeding-stage stand group and the thickness reduction is performed by the other of the preceding-stage stand group and the succeeding-stage stand group, or the thickness reduction is performed by both of the preceding-stage stand group and the succeeding-stage stand group. | 05-07-2015 |
| 20160059284 | MANDREL CONVEYING DEVICE FOR A TUBE ROLLING MILL - A rolling plant (R) for rolling tubes having a multi-stand rolling mill ( | 03-03-2016 |
| 20160199893 | COLD PILGER ROLLING MILL AND METHOD FOR FORMING A TUBE SHELL TO A TUBE | 07-14-2016 |
| 072209000 | Comprising plug acting on longitudinally moving work | 7 |
| 20090090153 | RETAINED MANDREL ROLLING MILL FOR SEAMLESS TUBES - A rolling mill ( | 04-09-2009 |
| 20100212387 | METHOD FOR PRODUCING A SEAMLESS STEEL PIPE AND ROLLING MILL FOR PERFORMING THE METHOD - The invention relates to a method and a rolling mill for producing a seamless steel pipe in a continuous rolling process, where semi-finished material is first formed into a hollow block ( | 08-26-2010 |
| 20110271731 | METHOD FOR PRODUCING SEAMLESS METALLIC TUBE BY COLD ROLLING - In cold rolling of a seamless metallic tube with a cold pilger mill, when a reduction ratio of an outside diameter becomes excessive in comparison to a reduction ratio of a wall thickness, strain in a circumferential direction on flange regions becomes excessive. As a result, compressive stress in a circumferential direction becomes excessive, so that wrinkle imperfections are generated inside a tube and folded on groove bottom regions to become folded defects. This process is repeated to be developed into inside defects. When a hollow shell is produced by the Mannesmann-mandrel process instead of the extrusion process, inside wrinkle imperfections are generated with a sizing mill (a stretch reducer or a sizer) at a stage of hollow shell. Since the inside wrinkle imperfections further grow in cold rolling, it is necessary to pay attention thereto. In consideration of these, (a reduction ratio of an outside diameter/a reduction ratio of a wall thickness both in a cold pilger mill) is set to not more than 1/2. It is, thereby, possible to obtain a high-quality seamless metallic tube, inside defects thereof being suppressed, produced by cold rolling. | 11-10-2011 |
| 20120036911 | METHOD FOR PRODUCING ULTRATHIN-WALL SEAMLESS METAL TUBE BY COLD ROLLING METHOD - A method for producing an ultrathin-wall seamless metal tube, which employs a cold pilger mill of mechatronics drive type including a mechanism to give a feed and a turn angle to a tube material, utilizes a roll having a tapered groove whose diameter gradually increases or gradually decreases from an engaging entry side to a finishing exit side of a pair of rolls, and a tapered mandrel whose diameter similarly gradually increases from the engaging entry side to the finishing exit side to elongate the tube material by reducing a wall thickness while expanding a mid-wall diameter of the tube material. By giving amounts of a turn angle and/or a feed equivalent or nearly equivalent to the forward stroke to the tube material immediately before the start of a backward stroke, it is possible to achieve a further increase in the reduction-rate of rolling, a further reduction of wall thickness, and improvement of dimensional accuracy of the product. | 02-16-2012 |
| 20120125068 | METHOD FOR PRODUCING SEAMLESS TUBES BY MEANS OF A THREE-ROLL BAR ROLLING MILL - 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. | 05-24-2012 |
| 20130061646 | PROCESS FOR ROLLING TUBES IN A CONTINUOUS MULTI-STAND ROLLING MILL - A tube rolling plant (R) with multi-stand rolling mill having two or more rollers, for implementing a mandrel rolling process with controlled speed has a mandrel ( | 03-14-2013 |
| 20150314346 | INNER SURFACE REGULATION TOOL, PLUG, MANDREL, HOT ROLLING MILL, PRESS PIERCING MACHINE, AND DRAWING MACHINE - An inner surface regulation tool includes a mandrel, a plug which is detachably connected to the mandrel, and a connection member which connects the plug and the mandrel by a magnetic force. One of the plug and the mandrel includes a column-shaped portion which extends in an axial direction of the one, and the other of the plug and the mandrel includes a joining hole which extends in an axial direction of the other and into which the column-shaped portion is inserted. In addition, the connection member is a permanent magnet which is attached to at least one of the column-shaped portion and the joining hole. | 11-05-2015 |
