EP0491071B1 - Streckformmaschine - Google Patents

Streckformmaschine Download PDF

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Publication number
EP0491071B1
EP0491071B1 EP90124540A EP90124540A EP0491071B1 EP 0491071 B1 EP0491071 B1 EP 0491071B1 EP 90124540 A EP90124540 A EP 90124540A EP 90124540 A EP90124540 A EP 90124540A EP 0491071 B1 EP0491071 B1 EP 0491071B1
Authority
EP
European Patent Office
Prior art keywords
jaw
fixed
jaws
frame
machine
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
EP90124540A
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English (en)
French (fr)
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EP0491071A1 (de
Inventor
Jean-Paul Huet
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ACB
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ACB
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Publication date
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Priority to DK90124540.7T priority Critical patent/DK0491071T3/da
Publication of EP0491071A1 publication Critical patent/EP0491071A1/de
Application granted granted Critical
Publication of EP0491071B1 publication Critical patent/EP0491071B1/de
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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die

Definitions

  • the present invention relates to a stretch forming machine according to the preamble of claim 1.
  • Such machines are used in particular for making parts for coating certain parts of aircraft: leading edges of the wings, fuselage elements, karman, cowls.
  • This template has the exact shape of the part to be obtained and it is therefore a question of wrapping the sheet metal around this template so as to make it perfectly fit this shape. This wrapping is carried out by pulling the sheet with plastic deformation in order to eliminate the spring effect.
  • French patent 1,087,985 thus describes a machine for shaping sheets by tension and winding.
  • This machine comprises a pit (11) above which a form (12) is suspended.
  • Each jaw (41) is articulated around a horizontal axis (38) at the end of three pairs of jacks (26, 49).
  • Each pair of cylinders is substantially in a vertical plane and comprises a cylinder (26) mounted on a gimbal and which oscillates about the horizontal and a control cylinder (49) which is in a vertical position or close to the vertical and which is articulated at its two ends along two perpendicular axes.
  • Such a machine is laterally unstable, moreover, the fact that the jaws are articulated around a horizontal axis (38) does not allow the sheet to be wound up over 180 °.
  • the sheet in fact remains permanently in the clamping plane of the jaws without ever forming an angle with these jaws, there is therefore no device for reacting to a torque undergone by the jaws.
  • This arrangement does not allow the formation of very narrow parts such as the leading edges of an aircraft wing. The presence of the pit is dangerous for personnel.
  • the object of the invention is to propose a safer and more efficient forming machine, making it possible to reach a winding angle of 240 ° and therefore to produce very fine parts such as leading edges. of airplane wings.
  • the invention thus relates to a machine for forming by stretching around a forming jig, comprising two jaws situated longitudinally on either side of the jig, each jaw being connected to a fixed part by motor means allowing each end of the jaw to move substantially in a plane perpendicular to the jaw in its rest position and, in this plane, in any direction, characterized in that said jig is fixed on a base linked to a table, located at the level from the ground, from a fixed frame and in that the machine comprises means for vertical guiding of the middle of the jaws, said jaws being linked to said motor means without the possibility of rotation relative to these means, about a longitudinal axis.
  • said vertical guide means comprise, for each jaw, a crutch consisting of a rod fixed in the middle of the jaw by means of an articulation with a vertical axis and sliding freely, with freedom of rotation, in a tube swiveling at its rear end, on the chassis, around a horizontal axis and the front end of which is guided in a vertical plane by a U-shaped guide piece.
  • said vertical guide means can be moved laterally in the lengthwise direction of the jaws.
  • said vertically displaceable lateral guide means comprise, for each jaw, a crutch consisting of a rod fixed to the middle of the jaw by means of an articulation with a vertical axis and sliding freely, with freedom of rotation, in a tube whose rear end is fixed to the frame by means of an articulation along two perpendicular axes and whose front end carries a guide nut provided laterally with cylinders with horizontal axes carrying pads sliding against two walls fixed vertical guides.
  • said motor means comprise for each jaw and for each end of a jaw, two means making it possible to vary the distance from a fixed point of the jaw, close to said end, at two fixed points of the frame, these two fixed points of the frame being two distinct points, situated in the plane transverse to the jaw in the rest position, passing through said fixed point of the jaw.
  • each jaw is equipped with a curved forming spout.
  • Figure 1 shows a perspective view of a stretch forming machine according to the invention.
  • Figures 2 to 4 show the drawing machine by drawing of Figure 1 in three views: front, top and side.
  • Figure 5 shows in front view a detail of a crutch for guiding the median plane of a jaw in the case of an alternative embodiment of the invention where the jaws can move in the direction of their length.
  • Figure 6 shows the stand of Figure 5 in top view.
  • Figure 7 is a section on VII-VII of Figure 5.
  • Figure 8 shows in section a detail of a jaw.
  • a stretch forming press comprising a frame 1 comprising a table 2 on which is fixed a forming jig 3.
  • the jig 3 is only shown on the FIG. 1.
  • the template 3 is linked to a base 4 which is directly fixed to the table 2.
  • two jacks 7 and 8 have one of their ends linked to a fixed point 9 near the right end of the jaw 5, the other end of the jacks 7 and 8 being fixed to two fixed points 10 and 11 of the frame 1. These two points 10 and 11 of the frame are situated in a plane perpendicular to the axis ⁇ passing through point 9 of the jaw 5. From the Similarly, the other end of the jaw 5 is moved by two jacks 12 and 13 and the jaw 6 by the jacks 14 and 16 at one of its ends and the jacks 15 and 17 at the other end. The jack 17 is not visible in the figures: it is located behind the jack 16 which hides it in FIG. 2.
  • the cylinders are articulated at their fixing points on the frame and on the jaws 5 and 6.
  • the middle of the jaw 5 is linked to a stand comprising a rod 18 which can slide freely, with freedom of rotation, in a tube 19 which swivels at its end 20 on the chassis 1.
  • the front end of the tube 19 is guided by a U-shaped guide piece 21.
  • the jaw 6 is linked in its middle to a rod 22 which slides in a tube 23, the rear end 24 of which pivots on the frame 1.
  • the tube 23 is guided vertically by a U-shaped guide piece 25.
  • the jaws 5 and 6 are connected to the crutches by the end of the rods 18 and 22, by an articulation with a vertical axis 51 and 52 respectively ( Figure 3).
  • the middle of the jaws 5 and 6 remains in a plane perpendicular to the axis ⁇ .
  • the system for connecting the jaws to the frame thus thus comprises, for each jaw, four controlled axes, the position of which during a sheet-forming forming operation is programmed so as to obtain perfect control of the trajectory.
  • each jaw moves substantially in planes perpendicular to the axis ⁇ .
  • a jaw end such as for example the end right, at its point 9, of the jaw 5 does not remain in the plane perpendicular to ⁇ passing through the points of articulation 10 and 11 of the jacks, as soon as the jaw is no longer moved parallel to the axes ⁇ .
  • the sheet to be stretched is pinched at each of its ends by the jaws 5 and 6.
  • the jaws 5 and 6 are linked to the jacks and the crutches by articulations with vertical axes and they can also pivot around the axes of the rods 18 and 22 of the crutches, but they cannot in any way pivot , relative to their attachment, around a longitudinal axis 53 for the jaw 5 or 54 for the jaw 6 ( Figure 3).
  • FIG. 8 is a detail showing in section a jaw 5 or 6 which carries a curved forming spout 55, at the outlet of the jaws 56 and 57.
  • This forming spout allows the sheet 26 to be wound against the jaws.
  • the presence of this spout and of the guide and reaction stand allows the winding, up to 240 ° of the sheet 26 on the forming tool 3, as well as the extreme approximation, almost touch-to-touch, of the two beaks which is made necessary for the formation of very narrow leading edges of aircraft wings: 20 mm for example.
  • Figures 5, 6 and 7 show a variant of the invention in which there is an additional axis of servo control by jaw allowing movement of each jaw along their longitudinal axis.
  • the guide stand 18, 19 is articulated at its rear end, by the tube 19, along two perpendicular axes 27 and 28.
  • This central guide nut 29 At the front end of the tube 19 is mounted a central guide nut 29 which can pivot by means of pins 30 and 31 about a substantially vertical axis.
  • This central guide nut 29 comprises four cylinders of jacks 32, 33, 34 and 35, the pistons 36, 37, 38 and 39 of which carry pads, 40 to 43, which slide on fixed vertical guide walls 44 and 45.
  • the stand 18, 19 may have a slight angular movement allowing a controlled movement of the jaws along their longitudinal axis.
  • This additional movement is advantageous, in particular in the case of forming on conical jigs, making it possible to avoid excessive elongations and the formation of folds.
  • This same longitudinal movement can also be obtained by cylinders articulated between the guide tubes 19 and 23 and the frame 1 of the machine; these jacks acting in a plane perpendicular to the axis of the guide tubes 19 and 23 and in a substantially horizontal direction.
  • Another solution is to articulate these jacks between the jaws 5 and 6 and the frame 1 of the machine, so as to create in space, with each of the two groups of main jacks 7, 8, 12, 13 and 14, 15 , 16, 17 and the frame 1 of the machine, a stable three-dimensional triangulation.
  • the actuator rods pass through the table 2 of the frame 1 through simple openings 58. These openings can be closed by a sliding curtain system, flush with the upper plane of the table 2. There is therefore no risk of operators falling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Polarising Elements (AREA)
  • Formation And Processing Of Food Products (AREA)

Claims (6)

  1. Streckformmaschine durch Strecken um eine Formschablone (3), mit zwei Backen (5, 6), die in Längsrichtung je auf einer Seite der Schablone (3) angeordnet sind, wobei jede Backe (5, 6) durch Antriebsmittel (7, 8, 12, 13, 14, 15, 16, 17) mit einem festen Bereich (1) verbunden ist, die es jedem Ende der Backe ermöglichen, sich im wesentlichen in einer Ebene senkrecht zur Backe in ihrer Ruhestellung zu bewegen, und zwar in dieser Ebene in beliebiger Richtung, dadurch gekennzeichnet, daß die Schablone (3) auf einem mit einem Tisch (2), der sich in Höhe des Bodens eines festen Gerüsts (1) befindet, verbundenen Sockel (4) befestigt ist und daß die Maschine Mittel (18, 19, 21) zur senkrechten Führung der Mitte der Backen (5, 6) aufweist, wobei die Backen mit den Antriebsmitteln ohne Drehmöglichkeit in Bezug auf diese Mittel um eine Längsachse (53, 54) verbunden sind.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die Führungsmittel seitlich in Richtung der Länge der Backen verschiebbar sind.
  3. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die senkrechten Führungsmittel für jede Backe eine aus einem Stab (18) bestehende Stütze enthalten, die in der Mitte der Backe mittels eines Gelenks mit senkrechter Achse befestigt ist und mit Drehfreiheit in einem an seinem hinteren Ende (20) in einem Lagerzapfen drehenden Rohr (19) auf dem Chassis um eine waagrechte Achse frei gleitet und deren vorderes Ende in einer senkrechten Ebene von einem U-förmigen Führungsteil (21) geführt wird.
  4. Maschine nach Anspruch 2, dadurch gekennzeichnet, daß die seitlich verschiebbaren senkrechten Führungsmittel für jede Backe eine aus einem Stab (18) bestehende Stütze enthalten, die in der Mitte der Backe mittels eines Gelenks mit senkrechter Achse befestigt ist und mit Drehfreiheit in einem Rohr (19) gleitet, dessen hinteres Ende auf dem Chassis mittels eines Gelenks gemäß zwei senkrechten Achsen befestigt ist und dessen vorderes Ende eine Führungsöse (29) trägt, die seitlich mit Zylindern (32 bis 35) mit waagrechten Achsen versehen ist, welche Kufen (40 bis 43) tragen, die gegen zwei feste senkrechte Führungswände (44, 45) gleiten.
  5. Maschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Antriebsmittel für jede Backe und für jedes Ende einer Backe zwei Mittel (7, 8, 12, 13, 14, 15, 16, 17) enthalten, die es ermöglichen, den Abstand eines festen Punkts (9) der Backe nahe dem Ende zu zwei festen Punkten (10, 11) des Gerüsts (1) zu verändern, wobei die beiden festen Punkte des Gehäuses zwei getrennte Punkte sind, die sich in der durch den festen Punkt der Backe verlaufende Querebene zur Backe in Ruhestellung befinden.
  6. Maschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jede Backe einen gekrümmten Formschnabel besitzt.
EP90124540A 1989-07-27 1990-12-18 Streckformmaschine Expired - Lifetime EP0491071B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK90124540.7T DK0491071T3 (da) 1989-07-27 1990-12-18 Maskine til formgivning ved strækning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8910149A FR2650205B1 (fr) 1989-07-27 1989-07-27 Machine a former par etirage

Publications (2)

Publication Number Publication Date
EP0491071A1 EP0491071A1 (de) 1992-06-24
EP0491071B1 true EP0491071B1 (de) 1994-01-19

Family

ID=9384208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124540A Expired - Lifetime EP0491071B1 (de) 1989-07-27 1990-12-18 Streckformmaschine

Country Status (7)

Country Link
US (1) US5086636A (de)
EP (1) EP0491071B1 (de)
AT (1) ATE100360T1 (de)
DE (1) DE69006217T2 (de)
DK (1) DK0491071T3 (de)
ES (1) ES2048950T3 (de)
FR (1) FR2650205B1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650205B1 (fr) * 1989-07-27 1994-12-09 Acb Machine a former par etirage
FR2745509B1 (fr) * 1996-03-01 1998-04-24 Lohr Ind Procede de fabrication d'un corps de benne a profil concave
FR2821771B1 (fr) * 2001-03-09 2003-08-29 Acb Pressure Systems Machine de formage de pieces en tole par etirage sur un outil, ou "forme"
JP4603194B2 (ja) * 2001-05-23 2010-12-22 株式会社オプトン ストレッチ成形装置
US7069761B2 (en) * 2004-05-05 2006-07-04 The Boeing Company Gripping apparatus and method
US7669452B2 (en) * 2005-11-04 2010-03-02 Cyril Bath Company Titanium stretch forming apparatus and method
US8661869B2 (en) * 2005-11-04 2014-03-04 Cyril Bath Company Stretch forming apparatus with supplemental heating and method
CN102814368A (zh) * 2012-08-23 2012-12-12 北京航空航天大学 一种型材热拉弯蠕变复合成形工装系统及其使用方法
CN102962382A (zh) * 2012-12-21 2013-03-13 杨世生 钢筋电热拉直器
RU171389U1 (ru) * 2016-05-19 2017-05-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Машина для формования вытяжкой деталей из металлического листа
CN113020388B (zh) * 2021-02-08 2023-03-10 中国重型机械研究院股份公司 一种四自由度横向蒙皮拉伸机
CN113020389B (zh) * 2021-02-08 2022-10-18 中国重型机械研究院股份公司 一种蒙皮拉伸机
CN113020387B (zh) * 2021-02-08 2023-03-10 中国重型机械研究院股份公司 一种具有三转一移特性的蒙皮拉伸机
CN114130881B (zh) * 2021-11-05 2024-03-01 上海申龙客车有限公司 蒙皮涨拉工装
CN117225969B (zh) * 2023-11-14 2024-03-15 中国重型机械研究院股份公司 一种蒙皮拉伸机用随动盖板及使用方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676639A (en) * 1950-09-02 1954-04-27 Richard Seifried Stretch-forming machine
FR1036632A (fr) * 1951-01-10 1953-09-09 Sncaso Presse à former les tôles par étirage et emboutissage simultanés
DE884784C (de) * 1952-05-10 1953-07-30 Otto Oeckl Streckziehpresse, insbesondere fuer flachverformte Streckziehteile
US2676638A (en) * 1952-07-26 1954-04-27 Richard Seifried Stretch-wrap forming machine
US2759513A (en) * 1952-08-20 1956-08-21 Lee B Green Method and apparatus for stretch bending metal members
US2943666A (en) * 1953-04-01 1960-07-05 Hawkes Thomas Blair Gripper devices
FR1106717A (fr) * 1953-05-18 1955-12-22 Joshua Bigwood And Son Ltd Perfectionnements apportés aux dispositifs de serrage ou pinces faisant partie des machines pour étirer des tôles
FR1087985A (fr) * 1953-09-14 1955-03-02 Machine à conformer les tôles par tension et enroulement
DE1235247B (de) * 1959-05-13 1967-03-02 Romeo Angel Lalli Streckziehpresse zur Blechverformung
US3302437A (en) * 1964-06-22 1967-02-07 Cyril Bath Co Tension control
US3948071A (en) * 1975-04-03 1976-04-06 Demott Electronics Company Tension control for stretch-forming machine
SU554908A1 (ru) * 1975-08-06 1977-04-25 Предприятие П/Я М-5841 Секционный обт жной пресс
US4698995A (en) * 1986-05-28 1987-10-13 Chorneau Frederick R Method for stretch forming drop hammer parts utilizing stretch wrap forming techniques
FR2650205B1 (fr) * 1989-07-27 1994-12-09 Acb Machine a former par etirage

Also Published As

Publication number Publication date
US5086636A (en) 1992-02-11
EP0491071A1 (de) 1992-06-24
FR2650205A1 (fr) 1991-02-01
ATE100360T1 (de) 1994-02-15
DE69006217D1 (de) 1994-03-03
ES2048950T3 (es) 1994-04-01
FR2650205B1 (fr) 1994-12-09
DE69006217T2 (de) 1994-05-05
DK0491071T3 (da) 1994-05-30

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