EP2446979B1 - Procédé et dispositif destinés au dressage de tôles perforées - Google Patents

Procédé et dispositif destinés au dressage de tôles perforées Download PDF

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Publication number
EP2446979B1
EP2446979B1 EP20110186009 EP11186009A EP2446979B1 EP 2446979 B1 EP2446979 B1 EP 2446979B1 EP 20110186009 EP20110186009 EP 20110186009 EP 11186009 A EP11186009 A EP 11186009A EP 2446979 B1 EP2446979 B1 EP 2446979B1
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EP
European Patent Office
Prior art keywords
metal sheet
clamping
stretching
sheet
longitudinal
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.)
Active
Application number
EP20110186009
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German (de)
English (en)
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EP2446979A1 (fr
Inventor
Lutz-Stefan Dr.-Ing. Henrich
Volker Dipl.-Ing. Loth
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.)
Schnutz GmbH
Original Assignee
Maschinenfabrik - Fr W Schnutz & Co KG GmbH
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Publication of EP2446979A1 publication Critical patent/EP2446979A1/fr
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Publication of EP2446979B1 publication Critical patent/EP2446979B1/fr
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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

Definitions

  • the invention relates to a method according to the preamble of patent claim 1 and an apparatus according to the preamble of claim 5 for planarizing a rectangular sheet with a running in the longitudinal direction of the sheet left and right longitudinal edge and extending in the transverse direction of the sheet upper and lower frontal edge.
  • Such a method and such a device are eg in the DE-C-440837 disclosed.
  • the invention relates to a method and a device for planarizing perforated plates and expanded gratings.
  • hole shapes one distinguishes the round holes, Quadratlochung, hexagonal holes, oblong holes, ornamental perforation and the special perforation.
  • Expanded meshes are a special form of perforation and result from staggered cuts and stretching without loss of material.
  • the expanded metal may have, for example, diamond meshes, round-hole meshes, or square meshes for forming the holes.
  • a perforated plate usually has on the left and right longitudinal side and the lower and upper end face on a non-perforated edge. This depends on the type of perforation, the sheet thickness, the tolerances, the outer dimensions of the sheet and the manufacturing tolerances during punching. Between the left and right longitudinal edge and the upper and lower end edge of the perforated plate is the hole field in which the holes are arranged in several rows, possibly with a hole offset to each other.
  • the method according to the invention relates primarily to such perforated sheets, it can also be used in conventional sheets delivered as sheets. This also applies to expanded mesh, which usually have no hole-free longitudinal edges.
  • the straightening rollers of the straightening roller machine can be bent in such a way that the edges and / or individual areas in the perforated field are additionally subjected to additional stretching.
  • the operator for the straightening roller machine selects the parameters for the wedge-shaped adjustment of the straightening rollers from the inlet to the outlet and the positioning systems transverse to the perforated plate based on their experience. The results of the plan directing are therefore not readily reproducible. As a result, the process of leveling often has to be repeated several times.
  • a device for planarizing a rectangular sheet comprising clamping devices for clamping the upper and lower front edge of the sheet, wherein each clamping device is associated with a drive for stretching the sheet in the longitudinal direction and the device means for detecting the actual values of the extension of Has sheet in the longitudinal direction. The detection takes place in each case after the stretching to determine the tensile stress distribution in the sheet. The stretching and measuring is repeated cft until a substantially uniform tensile stress distribution is present in the sheet.
  • a device for carrying out the method is characterized in that the device has means for detecting the actual values of the extension of the sheet in the transverse and / or longitudinal direction, the device comprises at least one measuring device for detecting the waviness of the sheet, the changes in distance between a surface of the sheet metal and the measuring device, while the measuring device and the sheet metal are moved relative to one another in a plane that is plane-parallel to a virtual plane bearing surface of the sheet metal and the device has a control / computing unit which is used to determine set values for the stretching for planarizing the sheet metal is arranged in the longitudinal and / or transverse direction taking into account the previously detected waviness and the yield strength of the sheet and to terminate the stretching of the sheet upon reaching the previously determined set points for the stretching.
  • the clamping devices preferably comprise clamping jaws, which are specially adapted to the sheet to be stretched, in particular in its edge regions.
  • the waves in the longitudinal and transverse direction of the perforated sheet can be by means of an algorithm and taking into account the known yield strength of the metal used target values for the stretching for planarizing the sheet in the longitudinal and / or transverse direction calculate.
  • the perforated plate Before straightening, the perforated plate usually has longitudinal and transverse waves.
  • a measuring device for detecting the ripple of the sheet upstream For detecting the waviness of the sheet, the at least one measuring device detects changes in the distance between one of the surfaces of the sheet and the measuring device while the measuring device and the sheet are moved relative to one another in a plane that is plane-parallel to a virtual planar support surface of the sheet.
  • the at least one measuring device is moved relative to the sheet in its longitudinal direction along a plurality of parallel measuring tracks. By a sufficient number of measurements along the measuring tracks results interpolated a longitudinal profile of the sheet. By detecting several parallel longitudinal profiles results in a dreidimensicnales image of the sheet.
  • the measuring device can also detect the changes in distance along a line parallel to the transverse direction of the sheet.
  • clamping devices are provided with a drive for stretching the sheet in the transverse direction. At the end faces, it is sufficient if the clamping device has a drive for extending the sheet in the longitudinal direction at one of the two end edges.
  • drives for the clamping bar or arranged on the clamping bar jaws of the clamping devices are in particular linear actuators into consideration, which cause a translational movement of the clamping bar in the sheet metal plane. In consideration are hydraulic or pneumatic cylinders, electromechanical linear drives or threaded rod drives.
  • the displacement of a clamping bar can also be effected by means of an eccentric shaft acting on the clamping bar.
  • the clamping device may have a separate drive for closing the jaws and a separate drive for stretching the sheet in the longitudinal or transverse direction.
  • the drive to close and open the jaws can also serve to stretch the sheet in the longitudinal or transverse direction.
  • the clamping devices, the drives and the guides for the clamping devices are arranged on a frame of the device for planarizing.
  • This frame absorbs the forces required in stretching the sheet which deform the frame in proportion to the force. This deformation of the frame is preferably taken into account in the algorithm for calculating the nominal extension of the sheet.
  • the device has a arranged between the clamping devices transport device for the sheet.
  • This transport device is designed for example as a roller table.
  • the transport device serves the purpose of moving the sheet from an input to an output of the device. During stretching, the transport device serves as a support for the sheet.
  • a centering and feeding device for the metal sheet is arranged in front of the input of the device.
  • the centering and feeding device preferably has a plurality of guide rollers, each one in relation to Surface of the sheet vertical axis are rotatable, wherein the distance between the vertical axes is adjustable. As a result, the guide rollers can be adjusted centrally to the plate on the outside width.
  • the measuring device for detecting the waviness of the sheet works with electro-optical sensors.
  • other distance sensors such as ultrasonic sensors, are also contemplated to detect the distance between the measuring device and the surface of the sheet.
  • each drive preferably has a displacement sensor, which detects the translational path of the drive for stretching the sheet.
  • Absolute encoders, incremental encoders, ultrasonic sensors or electro-optical sensors can be considered as displacement sensors.
  • the actual values of the extension are needed for a desired value comparison for ending the extension in the arithmetic unit.
  • the device for leveling (10) consists essentially of a machine frame (20), the clamping devices (30) for clamping the edges of a perforated plate (40), drives (50, 60, 70) for the clamping devices (30) and a transport device ( 80). Further, on the machine frame (20) on the input side, a centering and feeding device (90) arranged for the directional perforated plates (40).
  • the device (10) has ten clamping devices (30) for clamping the left longitudinal edge (41) and ten clamping devices (30) for clamping the right longitudinal edge (42) of the perforated plate (40) (see. FIG. 2 ).
  • Each clamping device (30) is associated with a drive (60) in the form of a pressure medium cylinder for stretching the sheet in the transverse direction (46), which has a piston rod as the output member (61).
  • the pressure medium cylinder has an axle receptacle (62), which is pivotable about an axis (63) fixed to the machine frame (20).
  • the piston rod is in turn connected via a hinge joint (64) hingedly connected to the end of a lever (31) of the clamping device (30).
  • a clamping jaw (32) On the underside of the lever (31) pointing in the direction of the perforated plate (40), a clamping jaw (32) is fastened, which can be brought into abutment on the upwardly facing surface of the perforated plate (40).
  • the lever (31) is articulated at the opposite end of the hinge joint (64) to a holder (33) for a further clamping jaw (34) which bears against the opposite surface of the perforated plate (40).
  • the holders (33) are guided displaceably on guide parts (21) of the machine frame (20) exclusively in the transverse direction (46).
  • the jaws (32,34) need not necessarily be designed as a separate component, but may be an integral part of the holder (33) and the lever (31).
  • the piston rod By pressing the pressure medium cylinder of the drive (60), the piston rod is extended, so that the Lowering the clamping jaw (32) on the longitudinal edge (41, 42) of the perforated plate (40) while the longitudinal edge (41, 42) between the upper jaw (32) and the lower jaw (34) clamped.
  • the lever (31) guided by the hinge joint (64) moves in the direction of the surface and thereby pushes the holder (33) along the guide part (21) in the transverse direction (46) of the dashboard (40).
  • the perforated plate (40) is thereby stretched in the transverse direction (46), whereby any transverse waves are straightened.
  • the centering and feeding device (90) comprises two Roller holders (91), each having two guide rollers (92).
  • the roller holders (91) have a base (93) with two parallel transversal (46) passageways (94) slidingly guiding the base (93) by means of slide bushings along two guide rods (95).
  • the guide rods (95) extend between two spaced-apart frame parts (26) of the machine frame (20).
  • a motor-gear unit (96) is arranged centrally between the abutment points of the guide rods (95) on the left-hand frame part (26) and moves the pedestals (93) toward and away from each other via a spindle (97).
  • the rollers (81) By means of a drive for the rollers (81), not shown, the perforated plate (40) after straightening, as seen from FIG. 6 recognizable from the device for planing (10) pushed out and fed to further processing.
  • FIG. 1 illustrates how the non-directed perforated plate (40) in the centering and feeding device (90) between the guide rollers (92) passes.
  • the centered perforated plate (40) is further promoted to the transport device (80), as is made FIG. 2 is recognizable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Claims (10)

  1. Procédé destiné à planéifier une tôle (40) rectangulaire, avec un bord longitudinal (41, 42) gauche et droit s'étendant en direction longitudinale (45) de la tôle (40), ainsi qu'un bord (43, 44) frontal supérieur et inférieur s'étendant en direction transversale (46) de la tôle, caractérisé par les étapes
    - détection de l'ondulation de la tôle (40),
    - recherche de valeurs de consigne pour l'étirage destiné à planéifier la tôle (40) en direction longitudinale et/ou transversale (45, 46) avec un algorithme qui tient compte de l'ondulation précédemment détectée et de la limite d'étirage de la tôle (40),
    - enserrage des bords longitudinaux (41, 42) et/ou des bords frontaux (43, 44) au moyen de chaque fois au moins un dispositif de serrage (30),
    - étirage de la tôle (40) en direction longitudinale et/ou transversale (45, 46) de la tôle, à l'aide du dispositif de serrage (30),
    - détection des valeurs réelles de l'étirage de la tôle (40), ainsi que
    - achèvement de l'étirage de la tôle (40) à l'atteinte des valeurs de consigne précédemment recherchées pour l'étirage.
  2. Procédé selon la revendication 1, caractérisé en ce que pour la détection de l'ondulation de la tôle (40), au moins un dispositif de mesure détecte des variations d'écart entre une surface de la tôle (40) et le dispositif de mesure, pendant qu'on déplace l'un par rapport à l'autre le dispositif de mesure et la tôle (40) dans un plan (49) plat et parallèle par rapport à une surface d'appui (48) plane virtuelle de la tôle (40).
  3. Procédé selon la revendication 2, caractérisé en ce qu'on déplace le dispositif de mesure ou la tôle (40) le long d'une ligne parallèle à la direction longitudinale et/ou transversale (45, 46) de la tôle, dans le plan (49) plat et parallèle.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que pour l'étirage de la tôle (40), chaque dispositif de serrage (30) est maintenu de façon stationnaire sur l'un des bords et on déplace le(s) dispositif(s) de serrage au moins en partie sur le bord opposé.
  5. Dispositif destiné à planéifier (10) une tôle (40) rectangulaire, avec un bord longitudinal (41, 42) gauche et droit s'étendant en direction longitudinale (45) de la tôle (40), ainsi qu'un bord (43, 44) frontal supérieur et inférieur s'étendant en direction transversale (46) de la tôle,
    - le dispositif (10) comportant chaque fois au moins un dispositif de serrage (30) pour enserrer le bord longitudinal (41, 42) gauche et droit de la tôle (40) et/ou chaque fois au moins un dispositif de serrage (30) pour enserrer le bord frontal (43, 44) supérieur et inférieur de la tôle,
    - au moins à chaque dispositif de serrage (30) étant associé sur l'un des deux bords longitudinaux (41, 42) un entraînement (60) pour l'étirage de la tôle (40) en direction transversale (46) et/ou au moins à chaque dispositif de serrage (30) étant associé sur l'un des bords frontaux (43, 44) un entraînement (50) pour l'étirage de la tôle en direction longitudinale (45), caractérisé en ce que
    - le dispositif (10) comporte des moyens pour détecter les valeurs réelles de l'étirage de la tôle (40) en direction transversale et/ou longitudinale (45, 46),
    - le dispositif comporte au moins un dispositif de mesure pour détecter l'ondulation de la tôle qui détecte des variations d'écart entre une surface de la tôle (40) et le dispositif de mesure, pendant qu'on déplace l'un par rapport à l'autre le dispositif de mesure et la tôle (40) dans un plan (49) plat et parallèle par rapport à une surface d'appui (48) plane virtuelle de la tôle (40) et
    - le dispositif comporte une unité de commande/de calcul qui est installée pour rechercher des valeurs de consigne pour l'étirage destiné à planéifier la tôle (40) en direction longitudinale et/ou transversale (45, 46), sous considération de l'ondulation précédemment détectée et de la limite d'étirage de la tôle (40) et pour achever l'étirage de la tôle, à l'atteinte des valeurs de consigne précédemment recherchées pour l'étirage.
  6. Dispositif selon la revendication 5, caractérisé en ce que le dispositif (10) comporte un système de transport (80) pour la tôle (40) placé entre les dispositifs de serrage (30), à l'aide duquel la tôle (40) est déplaçable d'une entrée (12) vers une sortie (11) du dispositif (10) et qui sert simultanément d'appui (48) pour la tôle (40) pendant l'ajustage et en ce qu'en amont de l'entrée (12) est placé un système de centrage et d'amenage (90) pour amener la tôle (40) en bonne position vers le système de transport (80).
  7. Dispositif selon la revendication 5 ou la revendication 6, caractérisé en ce que
    - l'entraînement (60) associé au dispositif de serrage (30) pour l'étirage de la tôle (40) en direction transversale (46) comporte un entraînement linéaire avec un organe de sortie (61) se déplaçant en translation,
    - l'organe de sortie (61) se déplaçant en translation dans un plan vertical qui s'étend en direction transversale (46) de la tôle (40), ainsi qu'à la perpendiculaire de la surface de cette dernière,
    - l'entraînement linéaire (60) est logé en étant pivotant autour d'un axe (63) s'étendant à la perpendiculaire du plan vertical,
    - l'organe de sortie (61) est relié de manière articulée avec une extrémité d'un levier (31), sur lequel est placée une mâchoire de serrage (32) du dispositif de serrage (30) qui est applicable sur une surface de la tôle (40) et
    - sur l'extrémité opposée, le levier (31) est articulé sur une attache (33) exclusivement déplaçable en direction transversale (46) pour une mâchoire de serrage (34) du dispositif de serrage (30) qui est applicable sur la surface opposée de la tôle (40).
  8. Dispositif selon l'une quelconque des revendications 5 ou 6, caractérisé en ce que
    l'entraînement (50) associé au dispositif de serrage (30) pour l'étirage de la tôle (40), notamment en direction longitudinale (45) s'engage sur une première mâchoire de serrage (35) du dispositif de serrage (30) qui est applicable sur une surface de la tôle (40),
    le dispositif de serrage (30) comporte une deuxième mâchoire de serrage (36) qui est applicable sur la surface opposée de la tôle (40)
    et le dispositif comporte des moyens de contrainte, pour contraindre l'une contre l'autre les mâchoires de serrage (35, 36) opposées.
  9. Dispositif selon l'une quelconque des revendications 5 à 8, caractérisé en ce que chaque entraînement (50, 60) comporte un capteur de course en tant que moyen destiné à détecter les valeurs réelles de l'étirage de la tôle (40).
  10. Dispositif selon l'une quelconque des revendications 5 à 9, caractérisé en ce que le système de centrage et d'amenage (90) comporte plusieurs galets de guidage (92) qui sont rotatifs chacun autour d'un axe vertical par rapport à la surface de la tôle (40) et en ce que l'écart entre les axes verticaux (53) est réglable.
EP20110186009 2010-10-28 2011-10-20 Procédé et dispositif destinés au dressage de tôles perforées Active EP2446979B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010049648 DE102010049648A1 (de) 2010-10-28 2010-10-28 Verfahren und Vorrichtung zum Planrichten von Lochblechen

Publications (2)

Publication Number Publication Date
EP2446979A1 EP2446979A1 (fr) 2012-05-02
EP2446979B1 true EP2446979B1 (fr) 2015-04-22

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EP (1) EP2446979B1 (fr)
DE (1) DE102010049648A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12121951B2 (en) 2019-10-11 2024-10-22 Sms Group Gmbh Device for stretching a metal semi-finished product in the form of individual plates along a stretching section with a stretching frame, and method for stretching a metal semi-finished product using the device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019215676A1 (de) * 2019-10-11 2021-04-15 Sms Group Gmbh Einrichtung zum Strecken eines metallenen Halbzeugs in Form von einzelnen Platten entlang einer Reckstrecke mit einem Reckgestell sowie Verfahren zum Strecken eines metallenen Halbzeugs unter Verwendung der Einrichtung
CN111811412B (zh) * 2020-07-31 2024-06-25 江苏金恒信息科技股份有限公司 用于板材拉伸试样的开肩中心定位装置

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DE100647C (fr) *
DE440837C (de) * 1927-02-19 Josef Stacke Verfahren zum Ebnen und Glaetten von Blechen durch Strecken
DE473463C (de) * 1927-06-01 1929-10-10 Fritz Ungerer Dipl Ing Verfahren zum Richten von Blechen
US2194551A (en) * 1936-06-25 1940-03-26 Emi Ltd Means and method of producing flat surfaces
FR1172366A (fr) * 1957-02-15 1959-02-10 Spidem Soc Pour L Installation Dispositif de contrôle d'allongement pour machines à dresser par traction
US3073373A (en) * 1957-10-14 1963-01-15 Hufford Corp Stretch forming apparatus
DE1853619U (de) * 1958-03-26 1962-06-20 Fritz Dipl Ing Ungerer Vorrichtung zur ermittlung von messwerten fuer das richten von blechen in richtmaschinen.
US3082809A (en) * 1958-11-28 1963-03-26 Hydraulik Gmbh Method and means for stretching undulated sheet material and like workpieces
DE19653569C2 (de) * 1996-12-20 1999-07-22 Witels App Masch Albert Gmbh Verfahren zur automatisierten Führung eines Richtprozesses
DE102004041732A1 (de) * 2004-08-28 2006-03-02 Sms Demag Ag Verfahren zum Richten eines Metallbandes und Richtmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12121951B2 (en) 2019-10-11 2024-10-22 Sms Group Gmbh Device for stretching a metal semi-finished product in the form of individual plates along a stretching section with a stretching frame, and method for stretching a metal semi-finished product using the device

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DE102010049648A1 (de) 2012-05-03

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