WO2012119175A1 - Procédé de positionnement d'une pièce sur une presse plieuse - Google Patents

Procédé de positionnement d'une pièce sur une presse plieuse Download PDF

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Publication number
WO2012119175A1
WO2012119175A1 PCT/AT2012/050030 AT2012050030W WO2012119175A1 WO 2012119175 A1 WO2012119175 A1 WO 2012119175A1 AT 2012050030 W AT2012050030 W AT 2012050030W WO 2012119175 A1 WO2012119175 A1 WO 2012119175A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
stop
lower tool
bending
stop element
Prior art date
Application number
PCT/AT2012/050030
Other languages
German (de)
English (en)
Inventor
Richard Edlbauer
Gerhard GUGLER
Original Assignee
Trumpf Maschinen Austria Gmbh & Co. Kg.
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 Trumpf Maschinen Austria Gmbh & Co. Kg. filed Critical Trumpf Maschinen Austria Gmbh & Co. Kg.
Publication of WO2012119175A1 publication Critical patent/WO2012119175A1/fr

Links

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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/002—Positioning devices
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/26—Stops

Definitions

  • the invention relates to a method for positioning a workpiece on a vertically operating press brake for a bending operation according to the preamble of claim 1.
  • stop elements In order to support the exact positioning of a workpiece in relation to the bending tools effecting a bending deformation, it is known to provide press brakes with stop devices in which stop elements, in particular stop fingers, have stop surfaces with which an edge or surface of the workpiece to be bent contacts before the bending operation is brought.
  • the stop elements are preferably adapted by means of CNC-controlled movement axes in their position to the respective bending task.
  • a holding device for the workpiece in the form of an electromagnet assembly This holding device serves to reliably hold the workpiece in contact with the stop surface until the beginning of the bending deformation, thereby ensuring the bending accuracy.
  • the object of the invention is to facilitate the positioning of a workpiece for subsequent bending and to improve even for less rigid workpieces.
  • the object of the invention is achieved by a method having the characterizing features of claim 1.
  • the stop process is moved in the vicinity of the lower tool and the actual bending output position only then made by adjusting the stop element together with the fixed thereto by means of the holding workpiece.
  • Such an abutment position adjacent to the lower tool minimizes undefined and uncontrollable deflection of the workpiece edge to be abutted behind the lower tool, since only a short free bending length is available between the bearing surface on the lower tool and the workpiece edge to be abutted.
  • the workpiece edge of the resting on the lower tool workpiece is thus at least approximately at the height of the support surface of the lower tool and can also be reliably carried out on stop surfaces with small vertical dimension a stop operation and a mispositioning of the workpiece can be avoided.
  • the positioning process is divided into a supply of the workpiece by the operator or by means of a handling device and a subsequent final positioning in the inventive method by means of the stop device.
  • the abutment surface already located in Biegeausgangsosition must be taken, it is sufficient in the process according to the invention to thread the workpiece edge between the upper tool and lower tool to some extent, which requires a much lower positioning accuracy of the workpiece edge to be attached and then the workpiece on the Lower lower tool.
  • the tool edge to be abutted is located at a small distance behind the working plane on the lower tool and can undergo no appreciable deflection up to the also positioned at a small distance to the working surface stop surface and thus be struck easily on the stop element.
  • the points of application on the workpiece used by a handling device are further positioned towards the operator side and there is less risk of a collision if a workpiece is gripped on the side with laterally adjacent bending tools.
  • a set of different bending tools arranged along the pressing bars can thereby be arranged with less lateral spacing in many cases, since the handling device has a greater distance from the working plane and also no free space between adjacent ones when a workpiece is gripped on the side for the handling device Bending tools must be provided.
  • the stop movement takes place by adjusting the stop element and can be carried out a position correction of the workpiece, in which this easily by the operator or by the handling device slidably held on the lower tool.
  • the accuracy requirements for a handling device used thereby are relatively low.
  • the actual stop movement can also be effected by the workpiece to be bent, wherein also a relative displaceability of the workpiece relative to a handling device used to avoid too high contact forces in fixed stop elements can be helpful or a mobility of the stop elements at the handling device immovable held workpiece, wherein a position change caused by the stop operation of a stop element is the next start of the bending output position is corrected or eliminated.
  • a stop surface with small dimension in the vertical direction can be easily taken, but it is also possible to provide a highest positioning accuracy of the workpiece edge to be abutted according to claim 5 and a bearing surface on the stop element, whereby the position the workpiece edge is defined exactly in the horizontal direction by the stop surface and in the vertical direction by the support surface on the stop element.
  • the abutment element with the support surface is then raised in the vertical direction and thus the support surface of the lower tool is moved from the lower lying waiting position into a height position coinciding with the support surface of the lower tool.
  • the bearing surface on the stop element and the support surface on the lower tool are thus at the same height and the holding device of the stop element can be activated, whereby the workpiece is fixed to the stop element and can then be moved in the horizontal direction in the bending starting position.
  • An alternative implementation of the method according to claim 7 is to track the workpiece during the bending operation by means of the stop element with activated holding device, whereby uncontrolled and undesirable deformations of the workpiece during the bending operation is counteracted. The struck workpiece edge is thereby guided approximately on an arcuate path starting from the Biegeausgangs- position, wherein the center of the web corresponds approximately to the position of the bending edge on the punch.
  • An automation of the method can be achieved by an embodiment according to claim 8, wherein an automated feeding of less rigid workpieces by means of a programmable handling device by dropping in the stop position is significantly facilitated by the reduced workpiece deflection.
  • the handling device or the gripping device arranged thereon can be deactivated and removed from the bending zone, whereby the movement space required for the bending deformation of the workpiece is released.
  • a possible development of the method consists in the implementation according to claim 10. Especially with less rigid workpieces, the position of the workpiece edge to be abutted is predictable only with low reliability, which is why a detection of the same can facilitate the stop process. As a result, corrections can be made in the positioning of the workpiece and / or in the positioning of the stop element, as a result of which the workpiece edge can hit the stop surface more reliably.
  • the detection of the workpiece edge position is preferably carried out according to claim 11 without contact, in particular optically with a camera.
  • the setting of the workpiece on the stop element is advantageously carried out according to claim 12 by means of a vacuum suction, a pliers gripping element or an electromagnet. Since the workpiece is displaced from the stop position to the bending output position substantially in the horizontal direction, no large moving forces are required, and the holding device of the aforementioned holding members can also be formed in a small size.
  • FIG. 1 shows a view of a press brake for carrying out the method according to the invention
  • FIG. 2 shows the positioning of a workpiece immediately before striking the stop device in the stop position
  • FIG. 5 shows the positioning of a workpiece by means of a vacuum suction element on the stop element
  • FIG. Fig. 6 the positioning of a workpiece by means of an electromagnet on the stop element.
  • FIG. 1 shows a view of a bending machine in the form of a vertically operating press brake 1, on which a method according to the invention for positioning a workpiece 2 for the subsequent bending can be carried out.
  • the workpiece 2 is supplied in the illustrated embodiment by means of a handling device 3, preferably in the form of a handling robot between a lower tool 4 on the fixed lower pressing beam and an upper tool 5 on the adjustable upper clamping bar, and brought by means of a stopper 6 in a defined position for carrying out the bending operation
  • the stop device 6 comprises in the illustrated embodiment, two stop elements 7 and 8, with approximately vertically extending abutment surfaces 9 and 10 at which a workpiece to be bent 2 is hit with a workpiece edge or a workpiece surface, and temporally immediately before it is placed on the lower tool 4 ,
  • the method is of course feasible even with only one stop element or more than two stop elements.
  • the method for a stopper member 7 it may also be related to two or more simultaneously active stopper members 7, 8, etc. with corresponding
  • Fig. 1 it may come in a little rigid workpiece 2 due to the dead weight to a deflection 11, which may make it difficult or impossible to hit the stop surfaces 9, 10.
  • the feeding of the workpiece 2 can Alternatively, also be done by an operator, which also the problem of bending of the workpiece 2 may occur and the striking can be difficult.
  • Even if the workpiece 2 is placed on a support surface 12 at the top of the lower tool 4, located behind the vertical plane working part of the workpiece 2 can undergo a deflection 11, which is the greater the further the workpiece trailing edge must be spent behind the work plane.
  • Fig. 2 shows in a partial section along line II - II in Fig. 1, the positioning of a workpiece 2 on a press brake 1 immediately before placing on the lower tool 4 and the striking of the stop element 7.
  • the positioning can be carried out by an operator or also, as shown in Fig. 1 and 2, by means of a handling s device 3.
  • the workpiece 2 is thereby introduced from the front 12 of the press brake 1 between the upper tool 5 and the lower tool 4, whereby a workpiece edge 13 to be struck by a between Lower tool 4 and upper tool 5 spanned vertical working plane 14 is moved toward the back 15 of the press brake 1.
  • the stop device 6 is arranged, which has a CNC-axis-controlled adjustable stop element 7, which has the approximately vertical stop surface 9.
  • the stop surface 9 is close, preferably as close as possible, to the lower tool 4 and the working plane 14, whereby a distance 16 of the workpiece edge 13 of the working plane 14 when hitting the stop surface 9 small compared to the surface dimensions of the workpiece 2 is held. If, in the course of the positioning process, the workpiece 2 is now placed with its workpiece lower side 17 on a support surface 18 of the lower tool 4, the workpiece edge 13 can only undergo a very small or negligible deflection due to the small distance 16, and thus the position of the workpiece edge 13 within a small tolerance window, which is why due to the method according to the invention even a slightly rigid workpiece 2 can still be struck on a small stop surface 9, without the risk that this is missed by the workpiece edge 13.
  • the workpiece 2 is shown in a position in which the workpiece edge 13 does not yet contact the abutment surface 9 and the workpiece underside 17 also does not touch the bearing surface 18 on the lower tool 4.
  • the workpiece 2 can now be positioned so that either the workpiece underside 17 on the support surface first 18 is placed and then the workpiece 2 is contacted in a horizontal direction against the stop surface 9 or that first the workpiece bottom 17 is placed on the support surface 18 and then the stop surface 9 is moved against the workpiece edge 13 of the resting workpiece 2.
  • a bearing surface 19 on the stop element 7 can be brought to a height position coinciding with the bearing surface 18 of the lower tool 4 even before placing the workpiece 2 on the lower tool 4, or even after placing the workpiece 2 on the lower tool 4 on the same Level as the support surface 18 are raised.
  • a holding device 21 is activated on the stop element 7, by means of which the workpiece 2 is fixed or fixed relative to the stop element 7, thereby ensuring the exact positioning of the workpiece 2.
  • the holding device 21 itself can form the support surface 19 of the stop element 7 or even be distanced from the support surface 19 or the stop surface 9 of the stop element 7.
  • the stop element 7 After the workpiece 2 is fixed by means of the holding device 21 on the stop element 7, the stop element 7 is moved from the stop position 20 in a dashed line indicated bending exit position 22, and the workpiece 2 thereby brought into the required position for the bending operation, with the length of a is determined by the bending process resulting bending gift.
  • the abutment surface 9 of the abutment element 7 is adjusted in the horizontal direction from a small or minimum distance 16 to the working plane 14 at an increased distance 23, which defines the bending output position 22.
  • the workpiece 2 can still be guided by a gripping device 24 of the program-controlled handling device 3, at least over a part of the adjustment path, since the workpiece 2, however, is guided by means of the holding device 21 is fixed anyway on the stop element 7, the adjustment of the workpiece 2 from the stop position 20 in the bending output position 22 without the cooperation of the handling device 3 and therefore the gripping device 24 are disabled after setting the workpiece 2 by means of the holding device 21 the.
  • the gripping device 24 can thereby be removed for the bending process from the bending zone or from the working area of the press brake 1, whereby the bending process can be carried out undisturbed without the risk of collisions.
  • the gripping device 24 can be activated at a different position on the workpiece 2, whereby the workpiece 2 can be supported or also tracked during the bending process.
  • the advantage of the positioning method according to the invention consists firstly in that, even with workpieces 2 which are less resistant to bending, the workpiece edge 13 can be struck reliably against the abutment surface 9 and further that at large distances 23 of the bending output position 22 there is no danger of a collision of the handling device 3 the upper tool 5, since the workpiece 2 can be transferred to the stop device 6 already in the stop position 20 and in this workpiece position, the gripping device 24 of the handling device 3 is still a sufficient distance from the working plane 14.
  • a separate handling device on the back 15 of the bending machine or press brake 1 can be omitted and with structurally low overhead, the functionality of such a press brake 1 also with regard to the automation of bending less rigid workpieces. 2 be improved.
  • Fig. 3 shows the inventive method at a time at which the workpiece 2 is already positioned by means of the stop device 6 in the bending output position 22, that is, the workpiece edge 13 struck on the stop surface 9 is located at the increased distance 23 to the working plane 14, the position of the bending edge at the curved Workpiece 2 determined.
  • the legs of the workpiece to be bent 2 are pivoted from the horizontal starting position, wherein in the illustrated embodiment, a pivoting upwards, since the lower tool 4 is formed as a die and the upper tool 5 as a punch.
  • the pivoting of the bending legs would be down.
  • Fig. 3 shows the upper tool 5, here in the form of a punch, in a position in which the top of the workpiece 2 is just touched, ie immediately before the beginning of the bending process.
  • the holding device 21 can be deactivated and the workpiece 2 is thereby released for carrying out the bending operation, if no tracking by means of the stop element 7 takes place . Since in an upper tool 5 in the form of a bending die and a lower tool 4 in the form of a punch the bending legs of the workpiece 2 are pivoted down can of course be provided in this case tracking the workpiece movement by the stop device 6 and / or the handling device 3 down , 4, the method is shown at a time in which the stop element 7 moves the workpiece 2 from the stop position 20 in the horizontal direction in the bending output position 22, wherein the holding device 21 in the example of FIG.
  • FIG. 6 shows a partial section through a stop element 7, in which the holding device 21 comprises an electromagnet 27.
  • the holding device 21 comprises an electromagnet 27.
  • the electromagnet 27 may in particular have a yoke-like iron core 28, the ends of which represent magnetic poles and at the same time form bearing surfaces 19 for the underside of the workpiece 17.
  • a camera 29 is further shown, which is connected to a control device 30 for the press brake 1 and for the handling device 3.
  • the camera 29 is used in an embodiment of the method to detect when feeding the workpiece 2 whose workpiece edge 13 in position and based on a position correction of the handling device 3 or the stop elements 7, 8 perform, on the one hand, the feeding of the workpiece 2 between the lower tool 4 and upper tool 5 secure and / or already placed on the lower tool 4 workpiece 2, the stop surfaces 9, 10 of the stop elements 7, 8 position so that a contact with the workpiece edge 13 can be made.

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

Abstract

L'invention concerne un procédé de positionnement d'une pièce (2) sur une presse plieuse (1), comportant l'acheminement de la pièce (2) par l'avant (12) entre un outillage supérieur (5) et un outillage inférieur (4), l'approche de la pièce (2) contre un dispositif de butée (6) placé sur la face arrière (15) de la presse plieuse (1), la pose de la pièce (2) sur l'outillage inférieur (4), le positionnement et l'amenée en butée d'une arête (13) de la pièce contre une surface de butée (9, 10) d'un élément de butée (7, 8) du dispositif de butée (6), et la fixation de la pièce (2) sur l'élément de butée (7, 8) par un dispositif de maintien (21) associé à celui-ci. Selon l'invention, la surface de butée (9, 10) contre laquelle l'arête (13) de la pièce est amenée en butée, est positionnée dans une position de butée (20) à une faible distance horizontale (16) de l'outillage inférieur (4), et le dispositif de maintien (21) est activé après l'arrivée en butée. Puis, l'élément de butée (7) et la pièce (2) fixée sont déplacés dans une position de départ pour le pliage (22), à une plus grande distance (23) de l'outillage inférieur (4), nécessaire pour que le formage par pliage puisse commencer.
PCT/AT2012/050030 2011-03-07 2012-03-07 Procédé de positionnement d'une pièce sur une presse plieuse WO2012119175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA298/2011 2011-03-07
AT2982011A AT510689B1 (de) 2011-03-07 2011-03-07 Verfahren zum positionieren eines werkstücks an einer abkantpresse

Publications (1)

Publication Number Publication Date
WO2012119175A1 true WO2012119175A1 (fr) 2012-09-13

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PCT/AT2012/050030 WO2012119175A1 (fr) 2011-03-07 2012-03-07 Procédé de positionnement d'une pièce sur une presse plieuse

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AT (1) AT510689B1 (fr)
WO (1) WO2012119175A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514930A4 (de) * 2013-12-04 2015-05-15 Trumpf Maschinen Austria Gmbh Hinteranschlageinheit für Biegemaschine
CN109261757A (zh) * 2018-09-23 2019-01-25 深圳市骏昊自动化科技有限公司 自动弯刀机弯折大角度方法
WO2019213680A1 (fr) * 2018-05-07 2019-11-14 Trumpf Maschinen Austria Gmbh & Co. Kg. Procédé mettant en œuvre une installation de production permettant le formage d'une tôle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429387A (en) 1944-11-18 1947-10-21 Hercules Electric & Mfg Co Inc Metal-working machine
EP0650782A1 (fr) * 1993-10-08 1995-05-03 Trumpf GmbH & Co Press brake
DE102005026727B3 (de) * 2005-06-09 2006-10-12 Heinz Wotke Ges.M.B.H. Blechbearbeitungsmaschine
EP1772204A1 (fr) * 2005-10-07 2007-04-11 CREA S.r.l. Plieuse pour tôles avec manipulateur intégré dans un dispositif de butée arrière

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357821A (en) * 1980-08-11 1982-11-09 Fowler Joseph M Gauge and workpiece holder for a forming machine
ATE401979T1 (de) * 2002-05-13 2008-08-15 Trumpf Maschinen Austria Gmbh Verfahren zum betrieb einer fertigungseinrichtung
AT503790B1 (de) * 2006-07-25 2008-01-15 Trumpf Maschinen Austria Gmbh Anschlagvorrichtung für eine biegepresse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429387A (en) 1944-11-18 1947-10-21 Hercules Electric & Mfg Co Inc Metal-working machine
EP0650782A1 (fr) * 1993-10-08 1995-05-03 Trumpf GmbH & Co Press brake
DE102005026727B3 (de) * 2005-06-09 2006-10-12 Heinz Wotke Ges.M.B.H. Blechbearbeitungsmaschine
EP1772204A1 (fr) * 2005-10-07 2007-04-11 CREA S.r.l. Plieuse pour tôles avec manipulateur intégré dans un dispositif de butée arrière

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514930A4 (de) * 2013-12-04 2015-05-15 Trumpf Maschinen Austria Gmbh Hinteranschlageinheit für Biegemaschine
AT514930B1 (de) * 2013-12-04 2015-05-15 Trumpf Maschinen Austria Gmbh Hinteranschlageinheit für Biegemaschine
WO2019213680A1 (fr) * 2018-05-07 2019-11-14 Trumpf Maschinen Austria Gmbh & Co. Kg. Procédé mettant en œuvre une installation de production permettant le formage d'une tôle
CN112088053A (zh) * 2018-05-07 2020-12-15 特鲁普机械奥地利有限公司及两合公司 包括用于成型金属薄板的加工装置的流程
CN109261757A (zh) * 2018-09-23 2019-01-25 深圳市骏昊自动化科技有限公司 自动弯刀机弯折大角度方法
CN109261757B (zh) * 2018-09-23 2021-11-09 深圳市骏昊自动化科技有限公司 自动弯刀机弯折大角度方法

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Publication number Publication date
AT510689B1 (de) 2012-06-15
AT510689A4 (de) 2012-06-15

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