EP3041618B1 - Machine de pliage et procédé de pliage d'une pièce en tôle - Google Patents

Machine de pliage et procédé de pliage d'une pièce en tôle Download PDF

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Publication number
EP3041618B1
EP3041618B1 EP14796392.0A EP14796392A EP3041618B1 EP 3041618 B1 EP3041618 B1 EP 3041618B1 EP 14796392 A EP14796392 A EP 14796392A EP 3041618 B1 EP3041618 B1 EP 3041618B1
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EP
European Patent Office
Prior art keywords
bending
punch
sheet metal
metal workpiece
punches
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Application number
EP14796392.0A
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German (de)
English (en)
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EP3041618A1 (fr
Inventor
Wolfgang Aigner
Bernhard Fischereder
Stefano Speziali
Thomas Weiss
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.)
Trumpf Maschinen Austria GmbH and Co KG
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Trumpf Maschinen Austria GmbH and Co KG
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Publication of EP3041618A1 publication Critical patent/EP3041618A1/fr
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209Tools therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02Stamping using rigid devices or tools
    • B21D22/06Stamping using rigid devices or tools having relatively-movable die parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02Stamping using rigid devices or tools
    • B21D22/08Stamping using rigid devices or tools with die parts on rotating carriers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/04Movable or exchangeable mountings for tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/04Movable or exchangeable mountings for tools
    • B21D37/06Pivotally-arranged tools, e.g. disengageable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/006Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends

Definitions

  • the invention relates to a bending machine comprising at least three bending punches, each having mutually parallel working edges, as set forth in claim 1, and a method for bending a sheet metal workpiece on such a bending machine, as specified in claim 11.
  • a bending machine in which an upper counter-punch relative to a frame, transverse to the sheet plane, from an upper retracted position to a lower working position and back is movable.
  • This counter-holder stamp are two arranged on the frame, lower punch opposite, the two lower bending punch are mounted pivotably about an axis extending in the region of the bend of the sheet axis in the frame and coupled together by a pivoting mechanism.
  • the fact that the two lower bending punch are coupled in the pivot mechanism it is achieved that in a deformation of the sheet through the upper counter-punch, the two legs of the sheet are bent symmetrically.
  • the upper counter-holder punch can be pivotally mounted so that sheets with protruding tabs can be bent in a larger bending angle.
  • the present invention has for its object to provide a bending machine, which ensures a variety deformability of the sheet metal workpiece to be machined Furthermore, the possibility should be opened that at least one bending leg of the sheet metal workpiece during the bending process in an initial plane which defines the initial position of the sheet metal workpiece remains. This is intended to minimize the safety risk for the machine operator, since at least on that side of the bending machine, on which the sheet metal workpiece is inserted, the bending leg should remain in a rest position during the bending process. Furthermore, in a further development of the bending machine, the force peaks of the forces acting on the bending machine should be reduced as much as possible during the bending process. Such a bending machine should also not damage the surface of the sheet metal workpiece during the bending process.
  • This object of the invention is achieved by a bending machine with the features according to claim 1 or by the special bending method with said bending machine according to claim 11.
  • a bending machine with the features according to claim 1 or by the special bending method with said bending machine according to claim 11.
  • a bending machine can be realized in which the sheet to be machined is touched at the three working edges of the three bending punch.
  • the expression that at least the second bending punch has three degrees of freedom in the reference plane or the third bending punch has at least one rotational and translational degree of freedom with respect to the reference plane it can be ensured that during the bending process the bending punches are guided flexibly along an arbitrary trajectory can, that a bending leg of the sheet metal workpiece during the bending process in a in the output plane lying position remains.
  • the arbitrary trajectory can be chosen so that the relative movement between the sheet metal workpiece and the bending leg are kept as low as possible during the bending process.
  • a bending machine for bending a sheet metal work piece comprising at least three bending punches, each having mutually parallel working edges formed.
  • the first and the second bending punch are positioned on one side, and the third bending punch is positioned on the opposite side of the output plane.
  • the working edge of the third bending punch is adjustable between the working edges of the first and second bending punch.
  • the third bending punch has at least one rotational and one translational degree of freedom in a reference plane oriented at right angles to a working edge.
  • the second punch has three degrees of freedom in the reference plane.
  • An advantage of the design according to the invention is that due to the high number of degrees of freedom, and therefore possibilities of movement of the individual bending dies, a bending process can be realized which combines the advantages of die bending and pivoting bending.
  • the high flexibility of the bending machine the sheet metal workpiece deforming punch can be performed along a trajectory that the smallest possible relative movement between the punch and sheet metal workpiece is formed, whereby the surface of the sheet metal workpiece is protected from damage.
  • the surface of the sheet metal workpiece can be protected by optimizing the trajectories of the individual bending dies, but also the necessary energy input by the bending machine during the bending process can be minimized.
  • a support body defining the output plane is designed for a sheet metal workpiece. It is advantageous in this case that this support body can be designed either as a simple support table, or as a special construction for the feed and the positioning of sheet metal workpieces. In a manual feed of the sheet metal workpieces to be processed sheet metal workpiece is placed on the support body and positioned with the aid of a stop element. It can be provided that the stop element is integrated directly into the support body.
  • the support body for example, a conveyor is integrated, which is used for Zu dinnern the workpieces to be processed.
  • the support body is movable and thus can record a workpiece to be machined from a defined transfer position and this can then perform the bending machine.
  • the support body is designed to pivot about a transverse axis, or about its vertical axis.
  • the third bending punch has three degrees of freedom.
  • the advantage here is that thereby the variety of applications of the bending machine and thus the variation of the bends of Blechwerk Swissenen be further increased.
  • the "die width" of the bending machine can be adjusted by adjusting the distance between the first and second bending punch, and the third punch can then be positioned symmetrically between these two punch punches.
  • the first bending punch has at least one translational degree of freedom in the reference plane. The advantage here is that thereby the variety of applications of the bending machine and thus the variation of the bends of Blechwerk Kohlenen can be further increased.
  • the "die width" can be adjusted.
  • the attack side of the punch can be moved to the opposite side of the output plane and therefore to the opposite side of the sheet metal. If the first punch has more than one degree of freedom, it can be moved according to the positioning capabilities of the third punch.
  • the first and the second bending punch are movable independently of each other. It is advantageous in an independent movement of the first and the second punch that during the bending process, for example, the first punch can be left in its position and only the second punch performs a kind of pivotal movement to bend the sheet metal workpiece. This ensures that one leg of the processed sheet metal workpiece can remain in a horizontal position. Furthermore, it is expedient that the three bending punches for positioning according to the number of their degrees of freedom with a drive mechanism selected from a group comprising rotary drive, rotary actuator, linear drive or combinations thereof are connected. The degree of freedom in the reference plane is a possibility of movement of the bending punch in this reference plane.
  • the possibility of movement of the punch is implemented by one of the above drives in a movement and positioning movement of the punch.
  • movement possibilities of a bending punch according to its degrees of freedom there are several different possibilities, which are mentioned here.
  • One degree of freedom in the reference plane means that the bending punch in this plane can perform a rectilinear motion in one direction. This will be realized by a linear drive which moves the bending punch.
  • a degree of freedom in the reference plane can also mean that the bending punch can perform a rotational movement, such as a rotation about its working edge. This rotational movement is implemented either by a rotary drive or by a rotary actuator.
  • Two degrees of freedom in the reference plane mean that the punch has either two translational degrees of freedom, one translational and one rotational degree of freedom, or two rotational degrees of freedom.
  • Two translatory degrees of freedom mean that the punch can be positioned at any point in the plane, but its orientation can not be changed.
  • This can be realized by a combination of two linear drives, which are arranged, for example, in a main direction and in a secondary direction normal to them.
  • these linear drives are normal to each other, but it can also be implemented a kind of parallel kinematics, in which the linear drives have a common crosspoint, whereby this point of the punch is freely movable in the reference plane.
  • a translational and a rotational degree of freedom can be implemented, for example, by a swivel arm with a linear drive connected thereto. Another possibility is a linear drive with attached rotary head.
  • the maximum freedom of movement of a punch is achieved by three degrees of freedom and a corresponding combination of the necessary drives. This can be achieved by a bending punch any point in the range of the punch with any orientation of the punch.
  • the possibilities of combinations of drives is very diverse and can be deduced from the above descriptions.
  • At least one of the bending punches is adjustable in the direction of its working edge, or is adjustable about a pivot axis parallel to the reference plane. It is advantageous in this development that after completion of the bending process, the bending tool can be swung out, for example, so that a processed sheet metal workpiece can be easily removed from the bending machine.
  • a bending punch can also be provided that the punch is extended linearly along its working edge from its working position.
  • a combination of swinging out and linear extension can also be provided. In this case, for example, the bending punch can be extended linearly in half, and then swung out about its center in order to minimize the space required for this procedure.
  • At least one of the bending punches has two working edges which are approximately opposite each other.
  • the versatility of the punch can be increased, which also bends in sections opposing orientations can be performed with this punch without the bending punch must be rotated by 180 ° with respect to its working edge.
  • the punch must be placed only on the opposite side of the sheet metal workpiece to allow an oppositely oriented bend.
  • At least one of the three bending dies is assigned a further bending punch, which is arranged on the opposite side of the starting plane, wherein the working edges of these two opposing bending dies are trimmed to one another. It is advantageous in such an embodiment of the bending machine that the versatility of the bending machine can be increased by the use of two opposing bending dies. Such an arrangement is ideal, especially for bends in orientations in opposite directions, since the bending dies do not have to be pivoted or brought to the opposite side of the starting plane in order to bend in the opposite direction of a preceding bend.
  • a force measuring element is integrated in at least one of the bending punch and / or in the drive device.
  • the sheet thickness can be determined because the force sensor returns a reading of a measured force as soon as the sheet metal workpiece touches all three bending dies, and thus clamped between them .
  • a force measuring element can detect when the sheet metal workpiece is no longer clamped at the end of a bending operation, while relieving the bending punch, and thus the sheet metal workpiece is fully spring-back and has reached its bending angle, which it is maintained due to the plastic deformation. This can be recalculated on the position of the punch, which bending angle was realized on the sheet metal workpiece.
  • At least one of the bending punches has at least one stop surface.
  • An advantage of the expression of a stop surface in one of the bending punch is that the bending punch can be used as a stop unit to correctly position a sheet metal workpiece to be bent, especially when manually inserting the workpiece. As a result, on the one hand space and on the other hand can be saved cost because no own stop unit must be performed in the bending machine. Furthermore, it is particularly expedient to provide one of the bending punch with a stop surface, since the position, or the geometry of the punch must be determined very accurately anyway for the labor of the bending machine.
  • a method in which for bending a sheet metal workpiece on a bending machine which has three bending dies with mutually parallel working edges, wherein with respect to an output plane in which a bending section to be processed of the sheet metal workpiece lies on one side of the first and the second Bending punch are positioned, and on the opposite side of the output plane of the third punch is positioned.
  • the working edge of the third bending punch is adjusted between the working edges of the first and second bending punch, and the third bending punch is moved in at least one rotational and one translational direction in a reference plane oriented at right angles to a working edge.
  • the sheet metal workpiece between the first and third working edge is held substantially in the starting plane, whereby a first bending leg is formed and the working edge of the second punch is guided along a path around the working edge of the third bending punch, whereby at the third Working edge of the bending edge and then a second bending leg is formed on this.
  • a bending machine which has three bending punches can be operated by this method.
  • the advantages of the Gesenkbiegens are, for example, that by three working edges on which the sheet metal workpiece is touched, a well-defined and very beautiful bending edge can be generated.
  • the bending force to be applied during the bending operation can be regulated very well.
  • the advantages of the pivoting bending for example, that during the bending process, one of the two bending legs of a processed sheet metal workpiece remains in a horizontal output plane.
  • the bending machine is ideal for automation tasks, since the position of the workpiece to be machined should be precisely defined here for the transfer of the sheet metal workpiece to a manipulation unit.
  • the path of the second working edge is set so that it contacts the sheet metal workpiece with the least possible relative movement during the bending process.
  • a control of the punch with attention to this aspect is particularly advantageous because the sheet metal workpiece is not damaged by largely avoiding relative movement between the punch and sheet metal workpiece. Such damage can be, for example, notches or grinding grooves in the sheet metal workpiece.
  • the necessary forming energy can also be reduced, since a certain amount of energy input is necessary for the unwanted damage of the workpiece surface in the form of damage.
  • the distance between the first and the second working edge is set and / or adjusted as a function of workpiece properties. It is particularly advantageous that the "Gesenkweite" can be adjusted by changing the distance between the first and second working edge. As a result, the force peaks of the bending forces acting on the bending machine forces can be adjusted because a greater distance between the first and second working edge has the consequence that the introduced by the punch in the sheet metal workpiece bending moment at the same effective force of the punch becomes larger. This allows the sheet metal workpiece to be bent more easily.
  • the free adjustability of the "Gesenkweite” is very advantageous because for sheet metal workpieces, which have a higher sheet thickness, simply the “Gesenkweite” can be increased. This possibility can also be used to sheet thickness fluctuations, which occur due to the manufacturing tolerances for rolled sheets.
  • the bending force regulation can be made flexible by changing the "Gesenkweite” and the bending radius, or the shape of the area of the sheet metal workpiece, which lies between the working edges of the punch.
  • the calculation programs, or the knowledge in connection with the three-point bending and variable Gesenkweite is present. It can thereby be achieved that the calculation programs on which such a bending process is based can be designed with the aid of years of know-how.
  • the distances between the third and first working edge and the third and second working edge are kept approximately the same during the bending process.
  • the advantage here is that act by adjusting an approximately equal distance between the working edges of the individual bending punch, the forces acting symmetrically on the two bending legs of the sheet metal workpiece.
  • a sheet metal workpiece can be produced, in which on the one hand, the bending radius has a uniform course, and also the two bending legs of the sheet metal workpiece are formed symmetrically in the vicinity of the bending edge.
  • the bending punches are guided oriented substantially at right angles to the workpiece surface. That a punch is oriented perpendicular to the workpiece surface means that essentially the vertical axis of the punch, on which also the working edge of the punch and the point of force application of a drive mechanism is oriented at right angles to the workpiece surface.
  • the sheet metal workpiece in sections opposing orientations before the respective bending operation of the first and / or second bending punch are required, positioned on the one or on the opposite side of the output plane.
  • the advantage here is that by the ability to position the punch on both sides of the output level to increase the variety of possible bends on the sheet metal workpiece.
  • the positioning of the bending punch is always carried out so that the first and the second bending punch are placed on one side of the output plane, and placed on the opposite side of the output plane of the third punch with its working edge between the first and second bending die lying.
  • the punch on the opposite side of the Output level are placed, so the orientation of the punch must be adjusted. This ensures that the working edge of the punch is always aligned so that it is oriented in the direction of the sheet metal workpiece to be processed.
  • the sheet thickness and / or the bending angle can be calculated by determining the position of a punch and the measurement of the force exerted on the sheet metal workpiece to be bent force. It is advantageous here that the position of the punch is known anyway, or is specified by the control unit of the bending machine. The geometry of the punch is known. By measuring the force exerted on the bending workpiece force, the sheet thickness and / or the bending angle can be calculated. Furthermore, it is possible by the measurement of the bending force during the bending process already to integrate the expected springback of the sheet metal workpiece in the calculations for the intended bending angle, creating a possible Bending can be omitted. Especially by the detection of the sheet thickness and the force to be applied in the bending process, it is possible to predict the bending behavior of the sheet metal workpiece on the basis of statistical records, whereby the final bending angle can be well precalculated.
  • Fig. 1 shows in an exemplary representation of the section through a bending machine 1 and to be processed sheet metal workpiece 2, which is oriented in an output plane 3.
  • the sheet metal workpiece 2 is essentially located on a first bending punch 4 and on a second punch 5.
  • a third bending punch 6 is positioned on the opposite side of the starting plane 3.
  • the three bending punches 4, 5, 6 touch the sheet metal workpiece 2 to be bent essentially at its working edges 7, 8, 9.
  • the bending punch 4, 5 act here similar to the die of a press brake as a lower tool, and the third punch 6 acts like an upper tool of a press brake.
  • the sheet metal workpiece 2 to be machined Upon contact of all three bending punches 4, 5, 6 with the sheet metal workpiece 2 to be machined, the largest bending moment in the sheet metal workpiece 2 is introduced at the bending edge 11. This bending edge 11 is almost coherent with the third working edge 9 of the third bending punch 6. By the bending edge 11, the sheet metal workpiece 2 within the bending portion 10 in a first Bending leg 12 and a second bending leg 13 divided. These two bending legs 12, 13 are deformed during the bending process only in their lying within the bending portion 10 part. As shown in this schematic diagram, the sheet metal workpiece 2 to be machined can also rest on a support body 14 in addition to the first bending punch 4 and the second bending punch 5.
  • the support body 14 may be formed as a simple support table, which only serves to support the sheet metal workpiece 2. This is particularly advantageous if the sheet metal workpiece is very large. It is also possible that the support body 14 comprises a conveyor 15, which is responsible for the manipulation of the sheet metal workpiece 2. Such a conveyor 15 may for example be a conveyor belt integrated in the support body 14, which is used for the transport of the sheet metal workpiece 2.
  • a further support body 16 is formed, on which the sheet metal workpiece 2 can rest.
  • a stop unit 17 is formed, which serves for positioning of the sheet metal workpiece 2.
  • This stop unit 17 can either be designed as a stand-alone element or it can also be integrated in a support body 14, 16. Of course, it is possible that the stop unit 17 not only takes over positioning tasks, but that this is also used simultaneously for the sheet metal manipulation.
  • the distance 18 between the two bending dies 4, 5, which essentially defines the bending portion 10 can be adjusted.
  • the third bending punch 6 is positioned between the first bending punch 4 and the second punch 5 in such a way that it comes to rest symmetrically between the two punching dies 4, 5.
  • Fig. 2 shows a perspective view of a punch 4, 5, 6, which is shown in a reference plane 19 cut.
  • the bending punch 4, 5, 6 shown in this view has at both ends of its high expansion a working edge 7, 8, 9. Thereby, it can be used so that it lying on both sides of the output plane 3, the sheet metal workpiece 2 with its working edge 7, 8, 9 can touch, causing him to use on the opposite Side of the output level 3 does not have to be pivoted.
  • a bending of a sheet metal workpiece 2 in the opposite direction with such a punch 4, 5, 6 realized well.
  • Fig. 2 are the possible movement possibilities, also called degrees of freedom, located in which the bending punch 4, 5, 6 can be moved in the reference plane 19.
  • the movement possibilities consist in a transverse direction 20, which corresponds to a guide direction along the output plane 3, a vertical direction 21, which corresponds to a guide along a direction normal to the output plane 3 and a direction of rotation 22, which rotation of the bending punch 4, 5, 6 in the reference plane 19 corresponds.
  • a transverse direction 20 and a vertical direction 21 which corresponds to a guide along a direction normal to the output plane 3
  • a direction of rotation 22 which rotation of the bending punch 4, 5, 6 in the reference plane 19 corresponds.
  • Fig. 3 shows a schematic structure of a combination of different drive mechanisms 23 in order to position a bending punch 4, 5, 6 in the reference plane 19 can arbitrarily.
  • This drive mechanism is responsible for the positioning of the punch 4, 5, 6 in the reference plane 19.
  • Fig. 4a and 4b such as Fig. 5a to 5e show several possible combinations of drives to a bending punch 4, 5, 6 to move in the reference plane 19.
  • Fig. 4a and 4b show the simplest embodiment of a drive combination in which a degree of freedom is given by a drive mechanism 23.
  • This can either be like in Fig. 4a represented by a linear drive 26 can be accomplished or by a in Fig. 4b shown rotary drive 24 or rotary actuator 25.
  • a bending punch 4, 5, 6 are changed in one direction, or the position of the punch 4, 5, 6 are changed in the reference plane 19.
  • Fig. 5a to Fig. 5e shows various arrangements by the bending punch 4, 5, 6 given two degrees of freedom to move, which are realized by appropriate drives.
  • two degrees of freedom are made possible by a combination of two linear actuators 26, which is not required that they are necessarily at right angles to each other.
  • the bending punch 4, 5, 6 can be brought into any position in the reference plane 19, however, its orientation is not changeable.
  • Another possibility is a combination of rotary or rotary actuator 24, 25 and linear drive 26.
  • Fig. 5b represented by a machine frame from the linear drive 26
  • FIG. 5d and 5e shown to combine two rotary or rotary actuators 24, 25, which may be installed at different positions of the drive mechanism 23. Also, a combination of these drives results in either the position or the position of the punch 4, 5, 6 are not arbitrary.
  • a combination of the drive mechanism can be realized in which three drives are used to arbitrarily position and orient the bending punch 4, 5, 6 in the reference plane 19. Due to the diversity of the embodiments, however, an exact description of the possibilities and / or graphic design is dispensed with here, since the individual execution options are in any case made up of a combination of the in 4 and 5 assembled embodiments shown.
  • Fig. 6 shows a schematic diagram of a sequence of a bending process.
  • the sheet metal workpiece 2 which was clamped between the punch punches 4, 5, 6, bent by the movement of the punch 5 along a path 27.
  • the third bending punch 6 can be tilted during the bending process in order to achieve an optimum bending result.
  • the trajectory 27 of the second punch 5, in particular the working edge 7 should be chosen so that the least possible relative movement between the punch 5 and the sheet metal workpiece 2 occurs. As a result, not only is the workpiece surface 28 protected, but also the energy required for the bending process can be minimized. Also, the third punch 6 should be moved with the sheet metal workpiece 2, that no relative movement between this and the sheet metal workpiece 2 occurs. In the bending process, as in Fig. 6 is shown, the first bending leg 12 remains horizontal and the second bending leg 13 is pressed by the second bending punch 5 upwards. The transformation of the sheet metal workpiece 2 takes place mainly in the bending edge 11.
  • Fig. 7 shows the same schematic diagram of a bending process as in Fig. 6 is shown, but here the second bending leg 13 is not bent upwards, but the second bending leg 13 is bent in the opposite direction down.
  • the bending dies 4, 5, 6 On the second side of the starting plane, the bending dies 4, 5, 6 must then each be pivoted by 180 ° so that their working edges 7, 8, 9 again face the sheet metal workpiece 2 to be machined.
  • a punch as in Fig. 2 is shown, which has two opposing working edges 7, 8, 9.
  • Fig. 8 shows a similar schematic diagram of the arrangement of bending dies 4, 5, 6, as shown in Fig. 6 is shown, but here is for a bend to be executed in the opposite direction, not provided that, as in Fig. 7 shown, the bending punch 4, 5, 6 are moved to the other side of the output level 3, but at least one further punch 29 is provided, which is not engaged in the bending operation in one side and in a bending operation in the other side than Replacement for the respective punch 4, 5, 6 is used, so that these bending punch 4, 5, 6 need not be brought to the other side of the reference plane 19 and also their orientation does not need to be changed.
  • Fig. 9 shows a possible construction of such a bending machine with three bending dies.
  • the first punch 4 and the second punch 5 are each coupled to a drive mechanism 23, which two linear actuators and a rotary actuator includes.
  • the bending punch 4, 5 in a certain work area 30 of the bending machine, which is within the reference plane 19, freely positionable.
  • the drive mechanism 23 connects the bending punches 4, 5 to the machine frame 31.
  • the third punch 6 is pivotable with respect to its working edge 9 and further zubewegbar on the sheet metal workpiece 2 or removable from this.
  • the illustrated bending machine was cut in the reference plane 19, which is located exactly in the middle of the bending machine.
  • the second half of the bending machine not shown here is a symmetrical illustration of the in Fig. 9 illustrated half of the bending machine.
  • the bending punch 4, 5, 6 can each be swung out of the working area 30 about a pivot axis 32, so that the sheet can be easily removed from the bending machine.
  • This Ausschwenkvorgang the bending punch 4, 5, 6 may also be necessary if they must be positioned for a bend in the opposite bending direction on the opposite side of the output level 3.
  • Fig. 10 will be in the Fig. 9 shown bending machine shown in a non-cut state.
  • the drive mechanisms 23 of the respective punch 4, 5, 6 are shown on both sides of the punch 4, 5, 6. At these drive mechanisms 23, the bending punch 4, 5, 6 are attached.
  • Fig. 11 shows a schematic diagram in which a force measuring element 33 is mounted on the third bending punch 6, by which force measuring element 33 and by determining the position of the bending punch 4, 5, 6, the sheet thickness 34 and the bending angle 35 can be determined.
  • the sheet thickness 34 can be determined by bringing all the bending punch 4, 5, 6 in an upright position. Thereafter, the sheet metal workpiece 2 is placed on the first punch 4 and the second punch 5. Subsequently, the third punch 6 is moved so far down until the force measuring element 33 returns a value to the machine control, thus it is registered when the third punch 6 touches the sheet metal workpiece 2.
  • the fact that the position of the individual punch 4, 5, 6 is specified by the machine control highly accurate, and is retrievable at any time, can now be recalculated to the plate thickness 34.
  • the procedure for determining the bending angle is as follows.
  • the sheet metal workpiece 2 is bent, wherein a plastic, as well as an elastic deformation occurs during the bending process. If the sheet metal workpiece 2 is now bent over by its elastic component, that is to say it is bent too much, then the sheet metal workpiece 2 will spring back by its elastic component when the bending punch 4,5,6 retracts. Now, if the force on the force measuring element 33 is zero, the bending angle 35 is reached, which is maintained by plastic deformation resistant. Due to the geometry and the position of the individual bending punch 4, 5, 6 can now be calculated back to the reached bending angle.
  • the force measuring element 33 may be, for example, a piezo element which is integrated in the bending punch 4, 5, 6. However, it can also be switched between bending punch 4,5,6 and drive mechanism 23 so as to detect the force acting on the punch 4,5,6 forces.
  • Fig. 12 shows a further embodiment of a bending punch 4, 5, 6 in the bending punch 4, 5, 6, a stop surface 36 is formed, on which the sheet metal workpiece 2 can be posted.
  • Fig. 1-12 are independent and possibly independent embodiments of the bending machine 1 shown, again with the same parts the same reference numerals or component names are used.
  • the representation and the description of the embodiments are limited to the exemplary embodiments and arrangement examples of the bending punch 4, 5, 6.

Landscapes

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

Claims (19)

  1. Machine plieuse (1) pour le pliage d'une pièce en tôle (2), comprenant au moins trois poinçons de pliage (4, 5, 6) qui présentent des arêtes de travail (7,8,9) orientées parallèlement les unes par rapport aux autres, moyennant quoi, par rapport à un plan de départ (3), dans lequel se trouve une portion à plier (10) à usiner de la pièce en tôle (2), sur un côté, le premier et le deuxième poinçons de pliage (4, 5) sont positionnés sur un côté et sur le côté opposé du plan de départ (3) est positionné le troisième poinçon de pliage (6) et l'arête de travail (9) du troisième poinçon de pliage (6) est mobile entre les arêtes de travail (7, 8) du premier et du deuxième poinçons de pliage (4, 5), le troisième poinçon de travail (6) présente au moins un degré de liberté en rotation et un degré de liberté en translation dans un plan de référence (19) orienté à angle droit vers une arête de travail (7, 8, 9), le deuxième poinçon de pliage (5) présentant trois degrés de liberté dans le plan de référence (19), caractérisée en ce que, séparé physiquement du premier poinçon de pliage (4), se trouve un corps d'appui (14) pour une pièce en tôle (2), définissant le plan de départ (3) et en ce que le premier poinçon de pliage (4) présente au moins un degré de liberté en translation dans le plan de référence (19).
  2. Machine plieuse selon la revendication 1 ou 2, caractérisée en ce que le troisième poinçon de pliage (6) présente trois degrés de liberté.
  3. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce que le premier et le deuxième poinçons de pliage (4, 5) sont mobiles indépendamment l'un de l'autre.
  4. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce que les trois poinçons de pliage (4, 5, 6) sont reliés, pour un positionnement correspondant au nombre de leurs degrés de liberté, avec un mécanisme d'entraînement (23) sélectionné dans un groupe comprenant un entraînement rotatif (24), un entraînement pivotant (25), un entraînement linéaire (26) ou des combinaisons de ceux-ci.
  5. Machine plieuse selon la revendication 4, caractérisée en ce qu'au moins un des poinçons de pliage (4, 5, 6, 29) est relié avec deux mécanismes d'entraînement (23) distants en direction de l'arête de travail (7, 8, 9), plus particulièrement identiques.
  6. Machine plieuse selon la revendication 4 ou 5, caractérisée en ce qu'au moins un des poinçons de pliage (4, 5, 6) est mobile dans la direction de son arête de travail (7,8,9) ou est mobile autour d'un axe de pivotement (32) parallèle au plan de référence (19).
  7. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce qu'au moins un des poinçons de pliage (4, 5, 6) comprend deux arêtes de travail (7, 8, 9) approximativement opposées.
  8. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce qu'à au moins un des poinçons de pliage (4, 5, 6) correspond un autre poinçon de pliage (29) qui est disposé sur le côté opposé du plan de départ (3), les arêtes de travail (7, 8, 9) de ces deux poinçons de pliage (4, 5, 6 ; 29) opposés étant orientées les unes vers les autres.
  9. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce que, dans au moins un des poinçons de pliage (4, 5, 6, 29) et/ou dans son mécanisme d'entraînement (23) est intégré un élément de mesure de force (33).
  10. Machine plieuse selon l'une des revendications précédentes, caractérisée en ce qu'au moins un des poinçons de pliage (4, 5, 6, 29) comprend une surface d'appui (36).
  11. Procédé de pliage d'une pièce en tôle (2) sur une machine plieuse qui comprend trois poinçons de pliage (4, 5, 6) avec des arêtes de travail (7,8,9) orientées parallèlement entre elles, moyennant quoi, par rapport à un plan de départ (3), dans lequel se trouve une portion de pliage (10) de la pièce en tôle (2), le premier et le deuxième poinçons de pliage (4, 5) sont positionnés sur un côté et sur le côté opposé du plan de départ (3) est positionné le troisième poinçon de pliage (6), l'arête de travail (9) du troisième poinçon de pliage (6) étant déplacé entre les arêtes de travail (7, 8) du premier et du deuxième poinçon de pliage (4, 5) et le troisième poinçon de pliage (6) est déplacé dans au moins une direction de rotation et une direction de translation, dans un plan de référence (19) orienté perpendiculairement vers une arête de travail (7, 8, 9), caractérisé en ce que, lors du processus de pliage, la pièce en tôle (2) est maintenue entre la première et la troisième arête de travail (7, 9) globalement dans le plan de départ (3), ce qui permet de former un premier montant de pliage (12) et l'arête de travail (8) du deuxième poinçon de pliage (5) est guidée le long d'une piste (27) autour de l'arête de travail (9) du troisième poinçon de pliage (6), ce qui permet de former, au niveau de la troisième arête de travail (6), l'arête de pliage (11) et, prolongeant celle-ci, un deuxième montant de pliage (13).
  12. Procédé selon la revendication 11, caractérisé en ce que la piste (27) de la deuxième arête de travail (8) est fixée de façon à ce que celle-ci, pendant le processus de pliage, entre en contact avec la pièce en tôle (2) avec un mouvement relatif le plus faible possible.
  13. Procédé selon l'une des revendications 11 ou 12, caractérisé en ce que, avant ou pendant le processus de pliage, la distance (18) entre la première et la deuxième arête de pliage (7, 8) est fixée et/ou réglée en fonction des propriétés de la pièce.
  14. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que, lors du processus de pliage, les distances (18) entre la troisième et la première arête de travail (7, 9) et la troisième et la deuxième arête de travail (8, 9) sont maintenus approximativement égales.
  15. Procédé selon l'une des revendications 11 à 14, caractérisé en ce que, lors du processus de pliage, les poinçons de pliage (4, 5, 6, 29) sont guidés de manière orientée globalement perpendiculairement vers la surface de la pièce (28).
  16. Procédé selon l'une des revendications 11 à 15, caractérisé en ce que, pour le pliage de la pièce en tôle (2) dans des orientations partiellement opposées, avant le processus de pliage proprement dit, le premier et/ou le deuxième poinçons de pliage (4, 5) sont positionnés selon les besoins sur un côté ou sur le côté opposé du plan de départ (3).
  17. Procédé selon l'une des revendications 11 à 16, caractérisé en ce que, caractérisé en ce que, pour le pliage de la pièce en tôle (2) dans des orientations partiellement opposées, un autre poinçon de pliage (29) est utilisé, qui est disposé de manière opposée à un des trois poinçons de pliage (4, 5, 6), moyennant quoi, pendant le processus de pliage, seuls trois poinçons de pliage (4, 5, 6 ; 29) sont toujours utilisés.
  18. Procédé selon l'une des revendications 11 à 17, caractérisé en ce que, caractérisé en ce que, pour l'introduction ou le retrait d'une pièce en tôle (2), au moins un des poinçons de pliage (4, 5, 6, 29) est retiré en direction de son arête e travail (7, 8, 9) ou est retiré de la zone de travail (30) autour d'un axe de pivotement (32) parallèle au plan de référence (19).
  19. Procédé selon l'une des revendications 11 à 18, caractérisé en ce que, caractérisé en ce que la détermination de la position d'un poinçon de pliage (4, 5, 6, 29) et la mesure de la force exercée sur la pièce en tôle (2) à plier permettent de calculer l'épaisseur de la tôle (34) et/ou l'angle de pliage (35).
EP14796392.0A 2013-09-02 2014-08-27 Machine de pliage et procédé de pliage d'une pièce en tôle Active EP3041618B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50538/2013A AT514769B1 (de) 2013-09-02 2013-09-02 Biegemaschine, sowie Verfahren zum Biegen eines Blechwerkstückes
PCT/AT2014/050187 WO2015027265A1 (fr) 2013-09-02 2014-08-27 Machine de pliage et procédé de pliage d'une pièce en tôle

Publications (2)

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EP3041618A1 EP3041618A1 (fr) 2016-07-13
EP3041618B1 true EP3041618B1 (fr) 2017-06-21

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EP14796392.0A Active EP3041618B1 (fr) 2013-09-02 2014-08-27 Machine de pliage et procédé de pliage d'une pièce en tôle

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US (1) US9849493B2 (fr)
EP (1) EP3041618B1 (fr)
AT (1) AT514769B1 (fr)
WO (1) WO2015027265A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108405665A (zh) * 2017-02-09 2018-08-17 上海岩灵自动化工程有限公司 一种电梯门板自动折弯生产线

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Publication number Priority date Publication date Assignee Title
DE1427344A1 (de) * 1961-11-18 1968-11-28 Harald Wirth Vorrichtung zum Abwinkeln von Flachschienen
AT393639B (de) 1990-03-15 1991-11-25 Lift Verkaufsgeraete Gmbh Blechbiegevorrichtung
US5474437A (en) 1992-04-24 1995-12-12 Anritsu Corporation Metallic die device for press machine
JPH06226354A (ja) 1993-01-29 1994-08-16 Amada Co Ltd 板材折曲げ加工装置
FR2741288B1 (fr) 1995-11-21 1997-12-26 Mas Barral Atel Const Du Outillage reglable de pliage de toles
IT1290685B1 (it) * 1997-02-18 1998-12-10 Work Corp Inc S R L Apparecchiatura per la formatura a freddo di spezzoni di lamiera per l'ottenimento di articoli allungati con sezione a profilo prefissato.
KR100527822B1 (ko) * 2000-08-11 2005-11-09 가부시키가이샤 아마다 벤딩 가공 방법 및 그 장치
US7415857B1 (en) * 2005-06-24 2008-08-26 Davor Petricio Yaksic Plate bending machines and methods
US8322176B2 (en) 2009-02-11 2012-12-04 Ford Global Technologies, Llc System and method for incrementally forming a workpiece

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP3041618A1 (fr) 2016-07-13
AT514769B1 (de) 2015-05-15
US20160236254A1 (en) 2016-08-18
WO2015027265A1 (fr) 2015-03-05
US9849493B2 (en) 2017-12-26
AT514769A1 (de) 2015-03-15

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