EP0438205B1 - Procédé et dispositif de redressage des bouts de pièces allongés - Google Patents

Procédé et dispositif de redressage des bouts de pièces allongés Download PDF

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Publication number
EP0438205B1
EP0438205B1 EP91250007A EP91250007A EP0438205B1 EP 0438205 B1 EP0438205 B1 EP 0438205B1 EP 91250007 A EP91250007 A EP 91250007A EP 91250007 A EP91250007 A EP 91250007A EP 0438205 B1 EP0438205 B1 EP 0438205B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
axis
straightening
sag
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91250007A
Other languages
German (de)
English (en)
Other versions
EP0438205A2 (fr
EP0438205A3 (en
Inventor
Hermann Dr.-Ing. Schroeder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0438205A2 publication Critical patent/EP0438205A2/fr
Publication of EP0438205A3 publication Critical patent/EP0438205A3/de
Application granted granted Critical
Publication of EP0438205B1 publication Critical patent/EP0438205B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/08—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers which move in an orbit without rotating round the work

Definitions

  • the invention relates to a device according to the preamble of claim 1 and a method according to the preamble of claim 2.
  • the basis for these preambles is US-A-3869897.
  • Elongated workpieces e.g. B. rods or tubes with impermissible deviations in straightness are usually in the manufacturing flow by means of a continuously working straightener, such as. B. roller straightener.
  • a continuously working straightener such as. B. roller straightener.
  • crooked ends are only partially or not at all detected.
  • workpieces with different cross sections at the ends compared to the rest of the area such as swaged pipe ends
  • the previously known continuous process fails completely.
  • workpieces that, according to the specification or due to the requirements of further processing, may only have a limited deviation from straightness must therefore be re-aligned by hand using stamp straightening presses.
  • This process is complex and requires an appropriately trained operator with a good sense of proportion.
  • a suitable device for having the edge of the sometimes heavy individual pieces must be available for the turning of the workpiece required for straightening. be it a crane or a hoist or something comparable.
  • a disadvantage of this device is the disproportionately large design effort for changing the eccentricity of the crankshaft.
  • the device is not suitable for straightening the ends of elongated workpieces.
  • a generic device can be found in US-A-3,869,897.
  • the end of a deformed workpiece can be straightened by a circular bending process.
  • the workpiece is loaded beyond the elastic limit.
  • the deflection takes place via an oscillating disc on which four piston-cylinder units are arranged to fix the workpiece.
  • the pin engaging in the oscillating disc is rotated by means of a reversible drive motor and a gear.
  • a pivotable toothed segment By means of a pivotable toothed segment, the pin fastened thereon is continuously shifted from its initial position and thus triggers the movement of the oscillating disk.
  • the maximum amplitude for the vibrating disc is reached as soon as the toothed segment strikes the stop element.
  • the object of the invention is to provide a structurally simple device with which the ends of different workpieces can also be adjusted with a thick wall.
  • the object of the invention is to provide a structurally simple device with which the ends of elongated workpieces can also be directed effectively with a thick wall.
  • the maximum deflection resulting from the bending stress which can be predetermined depending on the material used, rotates one or more times (s) around the workpiece axis.
  • the straightening process itself can take place in various ways, depending on whether the maximum deflection is applied briefly or only gradually. In the former case, after centering the workpiece, the maximum deflection is abruptly applied to it, which then rotates once or more (s) around the workpiece axis. Then the sudden relief takes place.
  • the workpiece is subjected to a certain deflection which then rotates in the manner described, the bending stress being increased continuously and continuously during the rotation until the maximum deflection is reached. This is then held over a certain circulation distance, after which the bending stress is continuously reduced until the workpiece is completely relieved.
  • the method according to the invention can be used both for cold and for heated workpieces.
  • the device consists of at least three, preferably four, plungers arranged symmetrically about a common axis, each of which is connected to a piston-cylinder unit.
  • the piston and cylinder units can be controlled as a function of time and position, and the piston performs a sinusoidal movement over time when straightening.
  • the piston-cylinder units are linked in terms of control so that they can work out of phase with one another.
  • the advantage of the device or the method lies in the fact that the workpiece stands still during the straightening process and that no rotating tools with a complex construction are required.
  • the process can run automatically and is easy to integrate in a bypass of a production line.
  • the device can be quickly and easily adjusted without having to convert to different workpiece dimensions.
  • the desired maximum deflection can be chosen freely depending on the material used.
  • the device according to the invention is shown in a simplified form in a longitudinal section, wherein the representation of the usually associated system parts has been omitted.
  • the pipe 1 clamped in a device 3, not shown, has an upset end 2, the straightness of which does not correspond to the delivery conditions and should therefore be straightened.
  • four plungers 5, 6, 7, 8 are arranged symmetrically about the compressed end 2 of the tube 1 about a common axis 4.
  • the plungers 5 to 8 are each connected to a piston-cylinder unit which is only indicated here and which, because of the graphic representation of the straightening process in FIG. 4, is provided with the Roman characters I to IV.
  • the radial movement of the plunger 5 to 8 is indicated by the arrow 9 shown in each case.
  • the circumferential maximum deflection f is shown schematically in FIG.
  • the arrow 10 is intended to illustrate the circulation of the deflection f.
  • the position of the plunger 5 to 8 shown in broken lines shows the starting point of the tube 1 after centering.
  • the offset of the center point 11 characterizes the maximum deflection f, which, calculated from the six o'clock position, has already passed through an angle of 45 degrees.
  • This cycle 10 is generated by the straightening process shown graphically in FIG.
  • the stroke of the piston of the respective piston-cylinder unit I to IV is plotted on the ordinate, this stroke corresponding to the radial travel of the associated tappet 5 to 8.
  • the positive amount should mean a movement of the piston or the plunger toward the center 11 and the negative amount should mean the opposite direction.
  • the first phase of the straightening process, centering means a All pistons I to IV are closed in the direction of center 11.
  • the start-up phase then begins, ie the piston I moves in the direction of the center 11 and, correspondingly, the opposite piston III moves away from the center.
  • the tube 1 also has the predetermined maximum deflection f. From here on, the actual straightening begins by running the maximum passage f clockwise or counterclockwise. This is achieved in that the stroke of the piston II and the stroke of the piston IV correspondingly in the opposite direction are used out of phase with the piston I. After one or two revolutions in this example, the stroke movement drops to zero in the run-down phase and by subsequent opening of all four pistons I to IV, ie away from the center 11, the directed end 2 of the tube 1 is released.
  • FIG. 5 graphically shows two different courses of the maximum deflection f.
  • the deflection f and the circumferential angle alpha are entered, for example, for a pipe.
  • sub-picture b the variant is shown when the maximum deflection f in the shortest time, i. H. is applied with a very steep rise 12 and then the circulation already described takes place. At the end of the cycle, the steep drop 13 takes place until the pipe 1 is completely relieved.
  • the cycle begins immediately after the initial deflection f has been applied, with this cycle continuously increasing to the maximum value 14 as the cycle continues .
  • This maximum value 14, comparable to that already shown in partial image b, is maintained for at least one full revolution. This is followed by slowly controlled waste 15 until the pipe 1 is completely relieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Forging (AREA)

Claims (4)

  1. Dispositif pour dresser les extrémités (2) de pièces allongées (1), en particulier de tubes, comportant un élément de maintien (3) pour fixer la pièce (1) et des moyens pour engendrer une déviation de l'axe (11) de la pièce à l'aide d'au moins trois vérins (I-IV) agencés symétriquement autour d'un axe commun (4), dont les poussoirs (5-8) peuvent être déplacés en direction radiale vers l'axe (4),
    caractérisé en ce que chaque vérin (I-IV) présente une commande dépendant du temps et de la course et ceux-ci sont combinés les uns aux autres, de sorte qu'ils effectuent ensemble, pendant le processus de dressage, avec un décalage de phase, une course sinusoïdale.
  2. Procédé pour dresser les extrémités (2) de pièces allongées (1), en particulier de tubes, dans lequel, sans rotation de la pièce (1) autour de son propre axe (11), la pièce (1) est déviée périphériquement au-delà de sa limite élastique, en utilisant un dispositif selon la revendication 1,
    caractérisé en ce que les poussoirs (5-8), pendant le processus de dressage, avec un décalage de phase, effectuent une course sinusoïdale, et la flexion maximale prédéfinie (f) est maintenue sur au moins un tour (2 π).
  3. Procédé selon la revendication 2,
    caractérisé en ce que, après un centrage, la pièce est sollicitée brusquement jusqu'à atteindre la flexion maximale prédéfinie, et cette flexion maximale tourne une ou plusieurs fois autour de l'axe de la pièce et, ensuite, la pièce est déchargée instantanément.
  4. Procédé selon la revendication 2,
    caractérisé en ce que, après un centrage, la pièce est soumise à une sollicitation en flexion différente de zéro, et la flexion engendrée tourne autour de l'axe de la pièce et, lors de cette rotation, la flexion est augmentée continuellement, jusqu'à ce que la flexion maximale prédéfinie soit atteinte, et celle-ci est maintenue sur une étendue de rotation déterminée et, ensuite, la flexion est réduite, de façon continue, jusqu'à la décharge complète de la pièce.
EP91250007A 1990-01-19 1991-01-10 Procédé et dispositif de redressage des bouts de pièces allongés Expired - Lifetime EP0438205B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4001901 1990-01-19
DE4001901A DE4001901A1 (de) 1990-01-19 1990-01-19 Verfahren und vorrichtung zum richten der enden von langgestreckten werkstuecken

Publications (3)

Publication Number Publication Date
EP0438205A2 EP0438205A2 (fr) 1991-07-24
EP0438205A3 EP0438205A3 (en) 1991-10-16
EP0438205B1 true EP0438205B1 (fr) 1994-06-01

Family

ID=6398607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250007A Expired - Lifetime EP0438205B1 (fr) 1990-01-19 1991-01-10 Procédé et dispositif de redressage des bouts de pièces allongés

Country Status (3)

Country Link
US (1) US5103666A (fr)
EP (1) EP0438205B1 (fr)
DE (2) DE4001901A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07266837A (ja) * 1994-03-29 1995-10-17 Horikiri Bane Seisakusho:Kk 中空スタビライザの製造法
US5810054A (en) * 1996-12-06 1998-09-22 Imi Cornelius Inc. Tubing end and method for forming
ES2209001T3 (es) 1997-05-12 2004-06-16 Firma Muhr Und Bender Estabilizador.
DE102006010040B3 (de) * 2006-03-04 2007-10-11 Eisenbau Krämer mbH Richtmaschine
DE102008027807B4 (de) 2008-06-06 2011-05-12 Eisenbau Krämer mbH Verfahren zum Herstellen eines großen Stahlrohres
CN101653795B (zh) * 2009-09-04 2011-01-05 太原重工股份有限公司 立式液压矫直机
CN106363045B (zh) * 2015-07-01 2021-04-02 重庆荆江汽车半轴股份有限公司 车辆用半轴热校直机
CN110814215B (zh) * 2019-10-23 2022-05-03 佛山市南海区南尚电工材料有限公司 一种漆包线缆的浮动矫直方法及其加工工艺
CN112474888B (zh) * 2020-11-18 2023-07-21 中机试验装备股份有限公司 一种校直用弹性支撑机构

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US455905A (en) * 1891-07-14 Automatic hammer
DE39015C (de) * A. J. GUSTIN in Boston, County of Suffolk, State of Mass., V. St. A Schienenrichtmaschine
GB112661A (en) * 1917-01-18 1918-01-18 James John Guest An Improved Method and Means of Straightening Metal Rods.
US3114276A (en) * 1956-07-31 1963-12-17 Kocks Gmbh Friedrich Device for drawing billet and bar stock
DE1205797B (de) * 1961-12-12 1965-11-25 Mannesmann Meer Ag Vorrichtung zum Kaltrichten stabfoermiger Hohl- und Vollkoerper
US3518868A (en) * 1968-01-11 1970-07-07 Don A Cargill Straightening machine and method
US3717020A (en) * 1968-10-15 1973-02-20 Ind Metal Prod Corp Process for straightening elongate members
DE2133586A1 (de) * 1970-11-06 1972-05-10 Galdabini R Verfahren zum Geraderichten von Werkstücken
US3869897A (en) * 1973-12-18 1975-03-11 Manno Kogyo Kabushiki Kaisha Apparatus for correcting deformation of a slender metallic products
SU732047A1 (ru) * 1977-10-13 1980-05-05 Ленинградский Ордена Трудового Красного Знамени Инженерно-Строительный Институт Устройство дл правки металлических стержней
US4488423A (en) * 1980-12-08 1984-12-18 Bertolette Machines, Inc. Straightening machine
EP0338144B1 (fr) * 1988-04-18 1992-06-17 Nisso Sangyo Co Ltd Dispositif pour le nettoyage et le redressement d'un article tubulaire

Also Published As

Publication number Publication date
DE4001901A1 (de) 1991-07-25
DE4001901C2 (fr) 1993-02-04
EP0438205A2 (fr) 1991-07-24
DE59101736D1 (de) 1994-07-07
EP0438205A3 (en) 1991-10-16
US5103666A (en) 1992-04-14

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