V & M DEUTSCHLAND GMBH Patent applications |
Patent application number | Title | Published |
20140305219 | CONICAL ULTRASONIC PROBE - An array of ultrasonic transducers in a conical formation emits pulses of ultrasonic simultaneously so that an anomaly of any orientation in a test object can be detected efficiently. | 10-16-2014 |
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 |
20130158699 | METHOD FOR MONITORING THE MANUFACTURING PROCESS OF HOT-MANUFACTURED TUBES MADE FROM STEEL - A method for monitoring the manufacturing process of hot-rolled tubes in which the type and dimensional characteristics of structures produced by the rolling process on an outer surface of the tube are evaluated to assess the process state. Immediately subsequent to the rolling process in the exit side region of a rolling stand the outer surface of at least one defined portion of the tube is detected by measuring technology, linearly by means of an optical laser stripe method and in a clocked manner in the form of profile lines, and the profile lines are then combined to form an at least two-dimensional topography and the topography is evaluated to assess the process state. | 06-20-2013 |
20130125496 | CONNECTION ARRANGEMENT FROM HOLLOW STEEL SECTIONS WHICH ARE SUBJECT TO AXIAL PRESSURE - The invention relates to a connection arrangement of hollow steel sections as support elements which are interconnected using a joint connection, the connection being subject to axial pressure. According to the invention, the joint connection is designed as a detachable, form-fitting plug-in connection. | 05-23-2013 |
20130119979 | LEAKAGE FLUX PROBE FOR NON-DESTRUCTIVE LEAKAGE FLUX-TESTING OF BODIES CONSISTING OF MAGNETIZABLE MATERIAL - A leakage flux probe for non-destructive leakage flux-testing of bodies consisting of magnetizable material, in particular of pipes consisting of ferromagnetic steel, having a plurality of sensors disposed one behind the other in a straight line for detection of near-surface flaws in the body. In order to create a leakage flux probe for non-destructive leakage flux-testing of bodies consisting of magnetizable material, in particular of pipes consisting of ferromagnetic steel, which in a main testing direction has a broadened directional characteristic. At least two similar sensors are disposed and interconnected in a sensor package in a different angular orientation with respect to the main testing direction one above the other, one next to the other or one lying inside the other. The sensor packages disposed generally in a line one behind the other can be influenced individually by the generated leakage flux of an existing flaw. The individual sensors of the sensor package are spaced apart from each other by such a small spaced interval that the interconnected sensors of a sensor package are collectively influenced by the generated leakage flux of an existing flaw. | 05-16-2013 |
20120272704 | METHOD AND DEVICE FOR THE OPTIMIZED CIRCULATION OF RODS IN THE PRODUCTION OF A SEAMLESSLY HOT-FABRICATED STEEL PIPE ACCORDING TO THE CONTINUOUS PIPE METHOD - 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. | 11-01-2012 |
20120244372 | METHOD FOR PRODUCING HOT ROLLED HOLLOW SECTIONS HAVING A RECTANGULAR CROSS-SECTION AND SMALL EDGE RADII - In a method for producing hot-rolled sections of steel with a rectangular or square cross-section, a substantially round pipe blank produced seamlessly by hot rolling or cold finished and welded and having a defined nominal outside diameter is initially produced and then formed at a forming temperature into a hollow section having the required cross-section, with visible edges C | 09-27-2012 |
20120197594 | METHOD FOR FILTERING MEASUREMENT SIGNALS - The invention relates to a method for filtering measurement signals by way of wavelet filtering, wherein the signals are first transferred to the wavelet domain by way of a wavelet transform, are subjected to threshold analysis, and the threshold values can then be varied in the wavelet domain commensurate with the respective measurement situation. The measurement signals are filtered by a plurality of filters arranged in segmentation levels and a statistical parameter is calculated based on an adjustable number of already calculated wavelet coefficients of a segmentation level and is then multiplied with a value that can be adjusted. | 08-02-2012 |
20120187096 | METHOD AND DEVICE FOR CONNECTING THE ENDS OF STEEL TUBES BY MEANS OF ORBITAL WELDING USING A HYBRID TECHNIQUE - The invention relates to a method for connecting the ends of steel tubes by means of orbital welding using a hybrid laser arc technique, with the tubes preferably having wall thicknesses ≧6 mm and more particularly ≧12 mm and diameters of preferably ≧150 mm, the ends of which tubes are connected by one or more welding passes, wherein the laser and arc welding heads as tools are guided over a guide ring fixedly arranged around a tube end in the region of the weld site during the welding and are displaced around the tube diameter. The invention also relates to a device for carrying out the method, wherein the laser and the arc welding heads are positioned separately on the guide ring and are moved over the tube circumference and controlled independently of one another during the welding process. | 07-26-2012 |
20120125111 | METHOD FOR NONDESTRUCTIVE TESTING OF PIPES - The invention relates to a process for the destruction-free testing of metallic pipes, in particular seamlessly produced steel pipes, in which method the entire length of the pipe is scanned following the circumference precisely and in this case, in addition to the wall thickness (WD) and the external diameter (D | 05-24-2012 |
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 |
20120098532 | METHOD FOR AUTOMATED MEASUREMENT OF THE RESIDUAL MAGNETIC FIELD STRENGTH OF MAGNETIZED FERROMAGNETIC WORKPIECES - The invention relates to a method for the automated measurement of the residual magnetic field strength of magnetized ferromagnetic workpieces, especially steel tubes, the residual magnetic field exiting the face of the tube end being measured by means of a measuring probe. Instead of directly measuring the residual field strength on the face, the curve of at least one magnetic field component is measured on the outer surface of the tube at least in the region of the tube ends and beyond the tube ends and the residual field strength on the face is inferred on the basis of the previously determined correlations between the residual field strength measured on the face and on the tube surface. | 04-26-2012 |
20120067841 | Traction rod for bracing a crane jib - The invention relates to a traction rod for bracing a crane jib, comprising a metallic tubular body and coupling elements which are connected to both ends thereof in an articulated connection of the traction rods among each other by means of bolts. According to the invention, the tubular body and the coupling elements can be detachably connected to each other, dispensing the need for a bonded connection, wherein the region of the connection is dimensioned in such a manner and is low on notch effects that, by calculation, the entire load capacity of the tube cross-section can be exploited with respect to a highest possible fatigue strength. | 03-22-2012 |
20120037584 | Traction Rod for Bracing a Crane Jib - The invention relates to a traction rod ( | 02-16-2012 |
20110315277 | STEEL ALLOY FOR A LOW-ALLOY STEEL FOR PRODUCING HIGH-STRENGTH SEAMLESS STEEL TUBING - The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15-0.18% C; 0.20-0.40% Si; 1.40-1.60% Mn; max. 0.05% P; max. 0.01% S; >0.50-0.90% Cr; >0.50-0.80% Mo; >0.10-0.15% V; 0.60-1.00% W; 0.0130-0.0220% N; the remainder is made up of iron with production-related impurities; with the optional addition of one or more elements selected from Al, Ni, Nb, Ti, with the proviso that the relationship VIN has a value of between 4 and 12 and the Ni content of the steel is not more than 0.40%. | 12-29-2011 |
20110268343 | METHOD FOR THE NONDESTRUCTIVE TESTING OF PIPES - The invention relates to a method for the nondestructive testing of pipes made of ferromagnetic steel for flaws by means of stray flux, wherein the pipe is magnetized by a constant field and the discontinuities present in the near-surface region of the outer or inner surface of the pipe cause magnetic stray fluxes, which exit the pipe surface and are detected by probes of a test unit each for longitudinal and/or transversal flaw testing, wherein the association of the detected amplitude signals is performed on the basis of the amplitude height and/or the frequency spectrum with respect to an external or internal flaw via defined flaw thresholds respectively. To this end, prior to associating the detected amplitude signals to an external or internal flaw, the angular position of the flaw relative to the respective magnetic field direction is determined, and a correction of the signals is carried out via a previously determined correction factor for amplitudes and/or frequencies of a perpendicular angular position. | 11-03-2011 |
20110259478 | HIGH-STRENGTH, LOW-ALLOY STEEL FOR SEAMLESS PIPES WITH OUTSTANDING WELDABILITY AND CORROSION RESISTANCE - A high-strength steel and a high-strength, weldable steel pipe. The invention relates to a high-strength steel and to a high-strength, weldable steel pipe. The high-strength, low-alloy steel for seamless steel pipes with outstanding weldability and resistance to stress corrosion cracking with a minimum yield strength of 620 MPa and a tensile strength of at least 690 MPa is characterized by the composition indicated in claim | 10-27-2011 |
20110238369 | METHOD FOR CHECKING THE DRIFTABILITY OF METALLIC TUBES - The invention relates to a method for testing the driftability of metal tubes, wherein a cylindrical drift body having a defined diameter and a defined length is guided through the tube with defined force for ensuring a predetermined internal diameter and a minimum straightness. Virtual drifting is hereby performed instead of the physical drift operation. | 09-29-2011 |
20110189496 | STEEL ALLOY FOR FERRITIC STEEL HAVING EXCELLENT CREEP STRENGTH AND OXIDATION RESISTANCE AT ELEVATED USAGE TEMPERATURES - A steel alloy with excellent creep strength and corrosion resistance that is ferritic at usage temperatures above 620° C. has the following chemical composition (in wt. %): C≦1.0%; Si≦1.0%; Mn≦1.0%; P max. 0.05%; S max. 0.01%; 2≦Al≦12%; 3≦Cr≦16%; 2≦Ni≦10% and/or 2≦Co≦10%, where 2≦Ni+Co≦[% Cr]+2.07×[% Al]>=0.95×([% Ni]+[% Co]); N max. 0.0200%. The remainder is iron with steel production-related impurities. Optionally, one or more elements of V, Ti, Ta, Zr, Nb, Mo and W, as well as one or more elements of Hf, B, Se, Y, Te, Sb, La and Zr with a cumulative content of <0.1% can be added. The steel structure includes uniformly distributed coherent precipitates based on a chromium-stabilized (Ni, Co) Al-B2 intermetallic ordered phase. | 08-04-2011 |
20100326557 | METHOD FOR THE PRODUCTION OF HOT-FINISHED SEAMLESS PIPES HAVING OPTIMIZED FATIGUE PROPERTIES IN THE WELDED STATE - The invention relates to a method for the production of hot-finished, particularly hot-rolled, seamless pipes having optimized fatigue properties in the welded state, having an outside diameter of up to 711 mm and a nominal wall thickness of up to 100 mm, made of metal, in particular steel. After hot or finish rolling, a defined pipe cross-section is produced on at least one pipe end across a predetermined length, having tight tolerances for inside and outside diameters, wherein the cross-section can then be welded to the pipe end of another pipe. According to the invention, in a region a wall thickness is created in a first step at the pipe end in question, the thickness being bigger than on the remaining pipe body, wherein the outside diameter is increased and/or the inside diameter is reduced. In a second step, the required pipe cross-section is produced in said region by mechanical treatment, and the transition from the treated to the untreated region of the pipe is produced with low surface roughness and almost notch-free, and the residual wall thickness remaining in the treatment region is within the required tolerances. | 12-30-2010 |
20100251794 | FORGING MANDREL FOR HOT-FORGING TUBULAR WORKPIECES OF METAL - 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 μm. | 10-07-2010 |
20100219818 | DEVICE FOR NONDESTRUCTIVE TESTING OF PIPES - A device for nondestructive testing of a pipe made of ferromagnetic steel for detection of longitudinal, transverse or inclined flaws using magnetic or magnetic-induction test procedures is disclosed. The device includes a magnetizing yoke which transmits the magnetic flux contactless into the pipe and at least two magnetic-field-sensitive scanning probes having GMR sensors. The GMR sensors are combined into sensor groups in form of a sensor array and electrically connected in parallel. A single preamplifier connected to each sensor group in one-to-one correspondence. The device further includes an evaluation unit. | 09-02-2010 |
20100206850 | METHOD AND DEVICE FOR CONNECTING THICK-WALLED METAL WORKPIECES BY WELDING - The invention relates to a method for connecting thick-walled metal workpieces by welding. In order to create the weld joint, the cross-sections are provided with a maximum of three weld regions according to wall thickness, the welding being carried out by a combined use of welding methods: the first weld region (root) is welded by means of laser beam welding or hybrid laser-arc welding, the second weld region is welded by means of hybrid laser-arc welding, and the third weld region required occasionally depending on the thickness of the sheet metal is welded by means of hybrid laser-arc welding or simply arc welding. The invention also relates to a seam preparation corresponding to the respective welding method used. | 08-19-2010 |
20100182424 | METHOD AND DEVICE FOR OPTICALLY MEASURING EXTERNAL THREADS - The invention relates to a method and device for optically measuring external thread profiles, particularly at the ends of pipes, wherein the thread is previously synchronously produced in a production line and is continuously measured in line from start to finish of the thread prior to further processing. The aim of the invention is to allow cost-effective inspection of the thread during synchronous production of the thread. For this purpose, the profile of the previously produced thread is illuminated and/or scanned tangentially to the pipe cross section by means of a relative movement including rotation and translation, and by an optical measuring unit comprising a camera, and the scanning speed is adjusted such that the time for scanning the thread profile, considering the required local resolution of the camera, is within the cycle time for the production of the next thread, wherein the image of the thread contour is captured by the camera and the optical signals are then evaluated and compared to target specifications. | 07-22-2010 |
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 |
20090044883 | METHOD OF MAKING A SEAMLESS HOT-FINISHED STEEL PIPE, AND DEVICE FOR CARRYING OUT THE METHOD - 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. | 02-19-2009 |
20080228412 | Method for Nondestructive Testing of Pipes for Surface Flaws - A method for nondestructive testing of the pipes for detecting surface flaws using magnetic leakage flux is disclosed. With of the method, flaws can be detected and analyzed in near-real-time while the pipe is produced. The data obtained with inductive coils, Hall sensors or GMR sensors are digitized, the digital data are buffered in a first memory, and a subset of the digital data are copied into a second memory. The copied data are transformed with a wavelet transformation and the resulting wavelet coefficients are filtered and/or modified. In an alternative embodiment, the digital data can be continuously supplied to a routine for wavelet transformation, which is performed using cascaded digital signal processing routines. The evaluated variable is compared with a reference value, wherein a determined flaw-based signal can be unambiguously associated with the position of the flaw. | 09-18-2008 |