EP3481565B1 - Streckbiegemaschine und verfahren zum verformen eines werkstückes - Google Patents

Streckbiegemaschine und verfahren zum verformen eines werkstückes Download PDF

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Publication number
EP3481565B1
EP3481565B1 EP17757664.2A EP17757664A EP3481565B1 EP 3481565 B1 EP3481565 B1 EP 3481565B1 EP 17757664 A EP17757664 A EP 17757664A EP 3481565 B1 EP3481565 B1 EP 3481565B1
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EP
European Patent Office
Prior art keywords
clamping
workpiece
stretch bending
bending machine
pressing die
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Active
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EP17757664.2A
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German (de)
English (en)
French (fr)
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EP3481565A1 (de
Inventor
Karl METZ
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Fill GmbH
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Fill GmbH
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Publication of EP3481565A1 publication Critical patent/EP3481565A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/04—Clamping arrangements

Definitions

  • the invention relates to a stretch bending machine for deforming workpieces, and a method for deforming the workpiece using the stretch bending machine.
  • the stretch bending machines known from the prior art have the disadvantage that the application of the tensile force to the workpiece and also the deformation of the workpiece by these known stretch bending machines have only insufficient accuracy.
  • the object of the present invention was to overcome the disadvantages of the prior art and to provide a stretch bending machine and a method for deforming workpieces by means of which the workpiece can be deformed with high precision.
  • the two clamping receptacles are designed to be flexible with regard to the application of the pulling direction.
  • the advantage of the design of the stretch bending machine according to the invention is that the clamping receptacles can be flexibly adapted to the respective degree of deformation of the workpiece to be deformed.
  • the two clamping receptacles each include an electric motor, in particular a servomotor, for adjusting the clamping head and are thus designed to apply a tensile force to the workpiece.
  • the clamping heads are positioned with a high degree of accuracy thanks to the electric motor drive of the chuck.
  • a high tensile force can be applied to the workpiece by the electric motor drive by means of the clamping heads, this being easily adjustable and controllable.
  • a drive can be integrated into the stretch bending machine simply, inexpensively and in a space-saving manner.
  • a hydraulic unit it is not necessary for a hydraulic unit to be provided for the electric motor drive, so that the operation of the stretch bending machine can be simplified and also carried out in an environmentally friendly manner.
  • the electric motor of the clamping fixture in particular with the interposition of a reduction gear, is coupled to an adjusting thread, in particular a ball screw drive, the electric motor being held on a motor holder and the clamping head being mounted on the motor holder by means of a linear guide so that it can be adjusted relative to the motor holder is, wherein the ball screw is designed to initiate a linear adjustment and an adjustment force in the clamping head.
  • a spindle drive in particular a ball screw drive
  • the clamping head can be mounted on the motor mount so as to be displaceable in the horizontal direction by means of the linear guide.
  • the plunger is arranged adjustably on the machine frame by means of an electric motor, in particular a servo motor, the electric motor being held on a motor mount which is coupled to the machine frame and the plunger mounted on the machine frame in an adjustable manner by means of a linear guide relative to the motor mount is, wherein an adjusting thread, in particular a ball screw, is designed for introducing a linear adjustment and an adjusting force in the plunger and is coupled to the electric motor of the printing device, in particular with the interposition of a reduction gear.
  • an electric motor in particular a servo motor
  • the electric motor being held on a motor mount which is coupled to the machine frame and the plunger mounted on the machine frame in an adjustable manner by means of a linear guide relative to the motor mount is, wherein an adjusting thread, in particular a ball screw, is designed for introducing a linear adjustment and an adjusting force in the plunger and is coupled to the electric motor of the printing device, in particular with the interposition of a reduction gear.
  • the clamping receptacle has a base unit which is coupled to the machine frame and has a swivel unit which is pivotably mounted in the base unit with respect to a swivel axis, the electric motor together with the motor holder and also the clamping head being included in the swivel unit and are jointly pivotable relative to the base unit of the clamping receptacle.
  • the advantage here is that with such a design of the clamping fixture it can be achieved that the clamping head can be freely pivoted with the workpiece during the deformation of the workpiece and thus the tensile force on the workpiece can be flexibly adapted to the current deformation angle and constantly along the workpiece clamps a neutral fiber of the workpiece takes place.
  • the swivel unit of the clamping fixture is coupled to an actuator, in particular a hydraulic cylinder or a pneumatic cylinder, by means of which the swivel unit can be actively rotated relative to the base unit.
  • an actuator in particular a hydraulic cylinder or a pneumatic cylinder
  • the clamping head is designed to accommodate workpieces which are designed as a hollow profile, an inner clamping unit being designed which is used for frictional clamping of an inside of the workpieces and an outer clamping unit being designed which is designed for frictional clamping an outside of the workpieces is used.
  • the advantage here is that a hollow profile can be clamped by the inner clamping unit and by the outer clamping unit in such a way that it is not deformed or compressed in an undesirable manner.
  • the inner clamping unit has a first clamping finger and a second clamping finger, which are provided with their outwardly directed contact surface for contact with an inside of the workpiece and that a wedge element is arranged between the two clamping fingers, whereby by axial displacement of the wedge element, the distance between the two contact surfaces of the clamping fingers can be adjusted by means of an adjusting means.
  • the advantage here is that an inner clamping unit designed in this way has a simple structure and can apply the highest possible clamping force to the workpiece while utilizing the limited space.
  • the outer clamping unit has a first clamping finger and a second clamping finger, which are provided with their inwardly directed contact surface for contact with an outside of the workpiece and that a wedge element is arranged outside each of the two clamping fingers, whereby axial Displacement of the wedge elements, by means of an adjusting means, the distance between the two contact surfaces of the clamping fingers can be adjusted.
  • a spring element is arranged between the two clamping fingers of the outer clamping unit, by means of which a restoring force is exerted on both clamping fingers.
  • both the first clamping head and the second clamping head have a compression spring, by means of which the workpiece can be arranged centrally between the two clamping heads before the clamping heads are closed.
  • This measure means that the workpiece is not exactly to be picked up must be placed centrally in the stretch bending machine, but that when the two clamping heads move towards each other, the workpiece can first come to rest on one of the two clamping heads and then the workpiece is centered by the same pressure distribution in the compression springs of the two clamping heads by further infeed movement of the two clamping heads.
  • a first support pad is formed on the machine frame, on which the undeformed workpiece can be placed, the first support pad being displaceable in the vertical direction and that a second support pad is formed on the machine frame on which the deformed workpiece can be placed is, wherein the second support pad is displaceable in the vertical direction. It can thereby be achieved that the workpiece to be machined can be inserted into the support and does not have to be held by the machine operator for the clamping process.
  • the plunger has an upper plunger part and a lower plunger part, the two plunger parts forming an insert groove with a groove base and two mutually aligned groove walls, which are each formed on a pressure stamp part, and wherein the workpiece can be received in the insert groove and wherein the distance between the two plunger parts can be adjusted relative to one another by means of an adjusting means, so that the two groove walls can be moved towards one another.
  • the advantage here is that the formed profile can be squeezed by means of the two pressure ram parts that can be moved relative to one another after the forming process has ended, so that any bulges can be pressed out of the profile.
  • the two clamping receptacles have a rough adjustment by means of which the distance between the clamping receptacles can be roughly adjusted to the workpiece length.
  • the advantage here is that this measure enables the stretch bending machine to be used for workpieces of different lengths.
  • the clamping head of the clamping receptacle is adjustable between 50mm and 1,000mm, in particular between 100mm and 500mm, preferably between 150mm and 250mm, relative to the motor mount.
  • the advantage here is that the clamping head can be adjusted in a sufficiently large area and can be built as small as possible.
  • the pressure stamp of the printing device is adjustable between 50mm and 2000mm, in particular between 100mm and 1000mm, preferably between 200mm and 300mm relative to the motor mount.
  • the advantage here is that the pressure ram can be adjusted in a sufficiently large area and can be built as small as possible.
  • the advantage of the method according to the invention is that the workpiece can be manufactured with a high degree of accuracy and the deformation parameters can also be precisely adhered to during the deformation process of the workpiece.
  • the tensile force applied to the workpiece by means of the two clamping heads is selected such that the workpiece is between 5% and 100%, in particular between 20% and 95%, preferably between 70% and 80% of the yield point of the workpiece is stressed.
  • the advantage here is that a tensile force in the specified range of the yield point of the workpiece means that the workpiece can be easily deformed and the internal stresses in the workpiece can be kept as low as possible after the deformation process.
  • the necessary tensile force is calculated by storing the workpiece geometry and the strength properties of the workpiece.
  • the advantage here is that by means of this measure, the necessary tensile force can be determined mathematically and can thus have an exact value.
  • the tensile force actually applied to the workpiece is determined by measuring the motor current and thus determining the torque of the electric motors of the clamping fixture.
  • the advantage here is that this measure enables the actually applied tensile force to be determined simply and with sufficient accuracy.
  • external measuring sensors can be provided to determine the tensile force actually applied to the workpiece.
  • the two clamping heads it is possible for the two clamping heads to be moved synchronously during the deformation process, with the center of the workpiece being held in the center of the plunger by means of active path control.
  • the advantage here is that the center of the workpiece is held in the center of the plunger during the deformation process and thus a uniform deformation of the workpiece can be achieved.
  • the swivel unit of the clamping receptacle can be freely swiveled relative to the base unit of the clamping receptacle and is swiveled by the workpiece.
  • the advantage here is that through this measure the clamping head exerts a pure tensile force on the workpiece and no bending moment is introduced into it.
  • the swivel unit of the clamping receptacle is pivoted back into a receiving position by means of the actuator of the clamping receptacle.
  • the first support pad is moved vertically upwards in order to insert the workpiece into the stretch bending machine and the first support pad is moved downwards after the workpiece is clamped in the clamping heads.
  • the second support pad is displaced upwards in the vertical direction and is used to hold the workpiece.
  • An embodiment is also advantageous, according to which it can be provided that the upper pressure stamp part and the lower pressure stamp part are moved towards one another after the end of the deformation process in order to be able to impress any bulges in the workpiece. In this way, any bulges in the workpiece resulting from the deformation process can be smoothed.
  • the upper plunger part and the lower plunger part are in a clamping position that is moved towards one another during the deformation process are held and after the end of the deformation process are spaced from each other to release the workpiece.
  • the advantage of this embodiment variant is that the workpiece is already held in shape or position several times during the deformation process and that after the deformation process has been carried out, the workpiece can be removed from the plunger easily and with little effort.
  • linear guides described in this document are designed in the illustrated embodiments in the form of recirculating ball bearings. However, it is also conceivable that the linear guides are designed, for example, in the form of form-fitting sliding guides, for example dovetail guides.
  • spindle drives described in this document are in the form of ball screws in the illustrated embodiments. However, it is also conceivable that the spindle drives are designed, for example, as normal adjusting threads, such as trapezoidal threads.
  • the electric motors described in this document are preferably designed in the form of servomotors. However, all other types of electric motors which have a corresponding control can also be used.
  • Forces occurring in electric motors due to the deformation of the workpiece can be detected, for example, by monitoring the motor current and thus the motor torque of the individual electric motors.
  • force sensors or torque sensors for example, directly detect the forces that occur.
  • the electric motors can have internal position sensors which can be used to calculate the position of the components to be driven using the angle of rotation of the electric motor.
  • the position of the components to be driven is recorded directly by means of displacement sensors.
  • the electric motors are coupled to a gear.
  • the clamping heads are designed to be rotatable with respect to a horizontally lying axis. In this way, it can be achieved that in addition to the bending caused by the pressure stamp, a torsion can also be generated in the workpiece.
  • the clamping heads can be driven by means of a rotary drive and the rotation can be actively set.
  • the pressure stamp has a variable width. This can be achieved, for example, in that the pressure stamp is designed to be divided with respect to its width and that the two side halves of the pressure stamp can be displaced relative to one another. As a result, the bending position on the workpiece can be varied or different design variants of the workpiece can be produced.
  • the inner clamping unit is designed to seal the hollow profile and that a medium can be introduced into the hollow profile by means of the stretch bending machine in order to be able to apply overpressure in the hollow profile, for example.
  • the medium can for example be a gas or a liquid, such as hydraulic oil. This measure makes it possible to avoid any indentations occurring in the workpiece during the deformation process.
  • the medium can be preheated or cooled so that a certain temperature can be applied to the workpiece.
  • heat or cold can be applied locally to the workpiece by means of a heating or cooling device arranged on the stretch bending machine.
  • a heating or cooling device arranged on the stretch bending machine.
  • This can be achieved, for example, by means of a gas burner which is aimed at the workpiece in the area of the bending point of the workpiece.
  • a heating or cooling device is formed in the pressure stamp.
  • the heating or cooling device can for example also be designed in the form of a coil for induction heating.
  • the structure in the workpiece can be influenced locally by the heating or cooling device. This can be necessary in particular in the area of the forming point.
  • a detection means in particular an optical detection means, such as a camera or a laser for position and position detection of the Workpiece is provided.
  • This position detection enables the workpiece to be picked up in the correct position in the clamping heads of the stretch bending machine.
  • the current deformation of the workpiece can be checked by the detection means during the deformation process.
  • a core is inserted into the cavity of a workpiece, in particular designed as a hollow profile, before the start of the deformation process.
  • the advantage here is that the workpiece is supported from the inside when the core is used, which is inserted into the cavity. Thus, deformations of the wall thickness of the workpiece are prevented.
  • FIGS. 1 and 2 each show a perspective view from different angles of an exemplary embodiment of a stretch bending machine 1 for deforming workpieces 2, the same reference symbols or component names being used for the same parts. The following description is based on an overview of the Figures 1 and 2 created.
  • the stretch bending machine 1 comprises a machine frame 3 on which a first clamping fixture 4 with a first clamping head 5 and a second clamping fixture 6 with a second clamping head 7 are arranged.
  • the first clamping head 5 is used to pick up and clamping a first side 8 of the workpiece 2 and the second clamping head 7 is used to pick up and clamp a second side 9 of the workpiece 2.
  • the clamping receptacles 4, 6 are arranged at a distance 10 from one another, the distance 10 corresponds approximately to a length of the workpiece 2.
  • workpieces 2 are deformed on the stretch bending machine 1 according to the invention, which have an elongate extension and are designed, for example, in the form of rods, flat iron, tubes, hollow profiles and the like.
  • the workpiece 2 is designed in the form of a hollow profile, which is therefore a Has inner side 11 and an outer side 12, which define a wall thickness of the hollow profile.
  • the first clamping head 5 and the second clamping head 7 serve not only to clamp and hold the workpiece 2, but can also be displaced in a pulling direction 13, whereby a tensile stress can be applied to the workpiece 2.
  • the direction of pull 13 lies parallel to the longitudinal direction of the workpiece 2.
  • the first clamping head 5 and the second clamping head 7 can be accommodated in the clamping receptacles 4, 6 such that differently designed clamping heads 5, 7 can be accommodated in the clamping receptacles 4, 6 for differently designed workpieces 2.
  • a printing device 14 with a pressure stamp 15 is provided, which is also arranged on the machine frame 3.
  • first clamping receptacle 4, the second clamping receptacle 6 and the pressure device 14 are mounted directly on a hall floor and thus the machine frame 3 can be dispensed with and replaced by the hall floor or another receptacle.
  • the direction of pull 13 lies parallel to the longitudinal direction of the workpiece 2.
  • the pressure ram 15 can be displaced in a pressure direction 16 lying transversely to the pulling direction 13. It can preferably be provided that the individual components, in particular the first clamping fixture, the second clamping fixture 6 and the pressure device 14 are arranged on the stretch bending machine 1 in such a way that both the pulling direction 13 and the pushing direction 16 lie in a horizontal plane and at right angles are arranged on top of one another.
  • the workpiece 2 is shown both in the undeformed starting position, in which it is just aligned, and in its curved shape after the end of the bending process.
  • the coarse adjustment 17 can be designed in the form of a row of holes which is arranged in the machine frame 3 and corresponds to corresponding counter-holes in the clamping receptacle 4, 6.
  • the distance 10 between the clamping receptacles 4, 6 can be varied.
  • clamping receptacles 4, 6 are arranged at the same distance from the center 18 of the pressure die 15. It can thereby be achieved that the center 19 of the workpiece 2, or the longitudinal center of the workpiece 2, can also be brought into congruence with the center 18 of the pressure stamp 15.
  • the plunger 15 of the printing device 14 is preferably coupled to a linear guide 20, by means of which it is arranged on the machine frame 3 so that it can be displaced in the printing direction 16.
  • the linear guide 20 is designed in the form of a recirculating ball bearing guide, wherein a guide rail 21 can be provided which is attached to the machine frame 3 and which interacts with a guide carriage 22.
  • a guide rail 21 can be provided which is attached to the machine frame 3 and which interacts with a guide carriage 22.
  • two of the guide rails 21 are formed which are arranged at a distance from one another on the machine frame 3 and that a plunger receptacle 23 is formed, on which two guide carriages 22 are attached per guide rail 21.
  • a total of four guide carriages 22 can therefore be attached to the plunger receptacle 23.
  • the plunger 15 can be arranged on the plunger receptacle 23 so that it can be coupled, so that different plungers 15 can be used for differently designed workpieces 2.
  • the plunger receptacle 23 is coupled to an adjusting means 24, whereby the plunger 15 can be displaced between a retracted rest position and an advanced reshaping position. If the plunger 15 is in the retracted rest position, a straight and undeformed workpiece 2 can be inserted between the first clamping receptacle 4 and the second clamping receptacle 6.
  • the adjustment means 24 of the pressure device 14 is implemented in the form of a ball screw drive 30.
  • a recirculating ball nut 31 is connected to the plunger receptacle 23 and that a recirculating ball spindle 32 is mounted in a motor mount 33 of the pressure device 14.
  • the motor mount 33 of the printing device 14 is fixedly coupled to the machine frame 3.
  • an electric motor 34 is provided for driving the recirculating ball screw 32, which can be optionally coupled to a reduction gear 35.
  • the electric motor 34 is preferably also fastened or arranged on the motor mount 33.
  • a first support pad 25 is formed on the machine frame 3, in which the workpiece 2 to be machined can be inserted and held. It is preferably provided that the first support pad 25 can be displaced in the vertical direction 27 by means of an adjustment means 26. As a result, after the workpiece 2 has been received in the clamping receptacles 4, 6, the first support pad 25 can be moved downward and thus disengaged in order to enable the workpiece to be freely deformed. As a result, the workpiece 2 is released for the forming process.
  • a second support pad 28 can be provided, which serves to hold the workpiece 2 in the deformed state.
  • the second support pad 28 can also be adjusted by means of an adjustment means 29 in the vertical direction 27 between a retracted position and a raised support position.
  • Both the first support pad 25 and the second support pad 28 can have a plurality of individual support elements which are arranged at a distance from one another.
  • Fig. 3 shows a perspective view of the plunger 15 with the plunger receptacle 23, again with the same reference numerals or component designations for the same parts as in the preceding Figures 1 and 2 be used. To avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 and 2 pointed out or referred to.
  • the pressure stamp 15 comprises an upper pressure stamp part 36 and a lower pressure stamp part 37.
  • the plunger parts 36, 37 can form an insert groove 38 in which the workpiece 2 can be received.
  • Such an insert groove 38 can, for example, also be formed in the case of a one-piece pressure stamp 15.
  • the insert groove 38 has a groove base 39 which is delimited by a groove wall 40 of the upper pressure ram 36 and by a groove wall 41 of the lower pressure ram 37.
  • the upper pressure ram 36 and the lower pressure ram 37 are displaceable relative to one another, so that a distance 42 between the two pressure ram parts 36, 37 to one another can be adjusted in a predefined adjustment range.
  • the distance 42 is preferably specified as the normal distance between the groove wall 40 of the upper pressure ram 36 and the groove wall 41 of the lower pressure ram 37. In other words, by adjusting the two plunger parts 36, 37, the distance between the two groove walls 40, 41 and thus the groove width can be varied.
  • an adjusting means 43 is formed which is used to adjust the two pressure stamp parts 36, 37 with respect to one another.
  • the actuating means 43 can be designed, for example, in the form of a hydraulic cylinder, a pneumatic cylinder or some other unit, such as an electric motor with a spindle drive or an electric motor with an eccentric shaft.
  • two adjusting means 43 are provided, which are arranged at a distance from one another and are used to adjust the pressure stamp parts 36, 37.
  • the implementation of two adjusting means 43 has the advantage that, on the one hand, the possible compressive force that can be applied can be increased and, on the other hand, the compressive force can be introduced symmetrically into the groove walls 40, 41.
  • the two plunger parts 36, 37 can be provided that either the upper plunger part 36 or the lower plunger part 37 are rigidly coupled to the plunger receptacle 23 and the respective other plunger part 36, 37 is movable relative to the rigidly coupled plunger part.
  • the pressure stamp parts 36, 37 are coupled to one another via a mechanism, the two pressure stamp parts being moved synchronously towards one another or moved away from one another. As a result, it can be achieved that the two groove walls 40, 41 are fed equally towards the workpiece 2.
  • the groove walls 40, 41 can serve during the deformation process to avoid bulges in the workpiece or provision can be made for any bulges that have arisen in the workpiece to be expressed by moving the groove walls 40, 41 towards one another.
  • the pressure stamp 36 can be divided into a left and a right pressure stamp part, so that a width 86 of the pressure stamp 36 can be variably adjusted.
  • a detection means 87 is designed to detect the workpiece before and / or during and / or after the forming process.
  • heat or cold can be applied locally to the workpiece 2 by means of a heating or cooling device 88 arranged on the stretch bending machine 1.
  • the first clamping receptacle 4 is shown in two perspective views from two different directions, again with the same reference numerals or component designations for the same parts as in the preceding Figures 1 and 2 be used. To avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 and 2 pointed out or referred to.
  • the individual components of the first clamping receptacle 4 are based on a synopsis of Figures 1 , 2 , 4th and 5 described. How particularly good in Fig. 1 As can be seen, the first clamping receptacle 4 and the second clamping receptacle 6 are constructed identically in terms of their operating principle, the second clamping receptacle 6 being only a mirrored version of the first clamping receptacle 4. For the sake of brevity, the Fig. 4 and 5 only the first clamping fixture 4 is described. It is clear to the person skilled in the art how the individual components of the first clamping receptacle 4 are to be folded over onto the second clamping receptacle 6 in a mirrored manner.
  • the clamping receptacle 4, 6 has a base unit 44, which is preferably rigidly coupled to the machine frame 3 via fastening means.
  • the base unit 44 can be made in one piece, for example in the form of a welded component with several components welded together.
  • the individual components of the base unit 44 can of course also be connected to one another by means of fastening means.
  • the base unit 44 is designed in one piece in the form of a cast part.
  • a pivot unit 45 can be accommodated in the base unit 44, which pivot unit can be pivoted relative to the base unit 44 with respect to a pivot axis 46.
  • the pivot axis 46 is preferably oriented vertically.
  • the pivot unit 45 of the clamping receptacle 4, 6 is received or mounted on an upper side 47 of the base unit 44 and on an underside 48 of the base unit 44.
  • a pivot bearing 49 is formed on the top side 47 or on the bottom side 48 of the base unit 44.
  • bolts are arranged both on the upper side 47 and on the lower side 48 of the base unit 44 and the pivot bearing 49 is formed on the pivot unit 45.
  • the pivot bearing 49 for the pivotable mounting of the pivot unit 45 relative to the base unit 44 can be implemented by means of ball bearings or, for example, by means of slide bearings.
  • the swivel unit 45 is coupled to an actuator 50, by means of which the swivel unit 45 can be actively swiveled relative to the base unit 44.
  • the actuator 50 can is coupled to the swivel unit 45 by means of a lever 51 and can thus serve to initiate a rotary movement in the swivel unit 45.
  • the actuator 50 is formed by an electric motor which is used directly or indirectly to initiate the rotary movement in the swivel unit 45.
  • the base of the swivel unit 45 is formed by a motor mount 52. All of the components built into the swivel unit 45 can be attached to the motor mount 52.
  • the motor mount 52 is pivotably arranged on the base unit 44 of the clamping receptacle 4, 6.
  • the motor mount 52 can likewise be designed in one piece or in one piece in various embodiments.
  • a linear guide 53 can be formed by means of which the clamping head 5, 7 is accommodated in the motor mount 52 in a linearly displaceable manner.
  • two guide rails 54 can be arranged on the motor mount 52, with which two guide carriages 55 each cooperate, which are arranged on the clamping head 5, 7.
  • an adjustment means 56 is provided, by means of which the clamping head 5, 7 can be actively linearly displaced relative to the motor mount 52.
  • the adjusting means 56 can, for example, a Include spindle drive.
  • a ball screw 57 is formed which is used to adjust the clamping head 5, 7.
  • the ball screw drive 57 can comprise a recirculating ball nut 58 which is rigidly connected to the clamping head 5, 7.
  • a recirculating ball screw 59 can be provided which cooperates with the recirculating ball nut 58.
  • the ball screw 59 can be mounted in a spindle bearing 60 which is rigidly coupled to the motor mount 52. Furthermore, it can be provided that an electric motor 61, 62 is used to drive the recirculating ball screw 59.
  • the electric motor 61, 62 can be coupled to the ball screw 59 via a reduction gear 63.
  • FIG. 11 shows a perspective view of a variant of the swivel unit 45 without showing the base unit 44.
  • the adjusting means 56 in particular the electric motor 61, 62 and the ball screw drive 57 for adjusting the clamping head 5, 7 are also not shown.
  • an upper axle journal 64 and a lower axle journal 65 are accommodated on the motor mount 52 and interact with the pivot bearing 49 arranged in the base unit 44.
  • the upper axle journal 64 can preferably be designed in such a way that it serves to receive the lever 51 to which the actuator 50 is coupled.
  • the two axle journals 64, 65 can preferably be coupled to the motor mount 52 by means of fastening means.
  • the clamping head 5, 7 can have an inner clamping unit 66 which is used to clamp the inside 11 of the workpiece 2. Furthermore, the clamping head 5, 7 can have an outer clamping unit 67 which is used to clamp the outer side 12 of the workpiece 2.
  • a compression spring 68 can be provided, which in Fig. 6 is shown symbolically and is arranged in the clamping head 5, 7, the compression spring 68 acting in the pulling direction 13 and serving to center the workpiece 2.
  • Fig. 7 shows a sectional view of the clamping head 5, 7 according to the section line VII-VII in Fig. 6 .
  • the inner clamping unit 66 has a first clamping finger 69 and a second clamping finger 70.
  • the first clamping finger 69 has a contact surface 71 which is directed outwards.
  • the second clamping finger 70 has a contact surface 72 which is also directed outwards.
  • the contact surfaces 71, 72 of the clamping fingers 69, 70 are used for a non-positive connection or for non-positive reception with the inside 11 of the workpiece 2.
  • a wedge element 73 is arranged, which moves in the adjustment direction 74 with respect to the clamping fingers 69, 70 is adjustable.
  • a distance 75 between the contact surfaces 71, 72 of the two clamping fingers 69, 70 of the inner clamping unit 66 can be adjusted by means of an adjusting means 76.
  • the adjustment means 76 is designed to move the wedge element 73 in the adjustment direction 74.
  • the adjustment means 76 can be designed, for example, in the form of a hydraulic cylinder or a pneumatic cylinder.
  • the distance 75 can be increased by pulling the wedge element 73 in a direction facing away from the workpiece 2.
  • the distance 75 can be reduced in that the wedge element 73 is pushed out.
  • the spring stiffness of the clamping fingers 69, 70 is used in this case to move the clamping fingers 69, 70 towards one another when the wedge element 73 is pushed out.
  • the outer clamping unit 67 can also have a first clamping finger 77 and a second clamping finger 78.
  • the two clamping fingers 77, 78 have contact surfaces 79, 78 which are aligned with one another and are used to clamp the outside 12 of the workpiece 2.
  • a distance between the two contact surfaces 79, 80 can be adjusted by means of an adjusting means 82.
  • the wedge elements 83 of the outer clamping unit 67 are coupled to the adjusting means 82 of the outer clamping unit 67.
  • a spring element 84 can be provided which presses the two clamping fingers 77, 78 of the outer clamping unit 67 apart and thus holds them in their open position or serves to reset the two clamping fingers 77, 78 during opening.
  • the wedge surfaces between the wedge elements 83 and the clamping fingers 77, 78 can be designed in such a way that when the wedge elements 83 are pushed forward in the direction of workpiece 2, the clamping fingers 77, 78 of the outer clamping unit 67 are moved towards one another and thus the workpiece 2 can be clamped . When the wedge elements 83 are withdrawn, the clamping fingers 77, 78 can move apart again due to the force exerted by the spring element 84.
  • a stop 85 which serves as a depth stop for the workpiece 2, can be formed on the inner clamping unit 66 or on the outer clamping unit 67.
  • Both the contact surfaces 71, 72 of the inner clamping unit 66 and the contact surfaces 79, 80 of the outer clamping unit 67 can have micro-toothing or something else to increase the friction and thus to increase the clamping force.
  • lubrication grooves are formed on the individual sliding surfaces of the wedge elements 73, 83, which serve to supply the sliding surfaces with lubricant in order to minimize wear.
  • several grease nipples can be provided in the inner clamping unit 66 and in the outer clamping unit 67.
  • the workpiece 2 which is straight and undeformed, is placed in the stretch bending machine 1.
  • the first support pad 25 is shifted upwards and thus serves to receive the workpiece 2.
  • the clamping heads 5, 7 can then be moved symmetrically towards one another in the pulling direction 13 in order to be able to introduce the workpiece 2 into the clamping head 5, 7.
  • the compression spring 68 arranged in the clamping heads 5, 7 can ensure that a workpiece 2 that is not 100% centrally inserted is centered when the clamping heads 5, 7 move towards one another, and the center 19 of the workpiece 2 is thus aligned with the center 18 of the plunger 15 .
  • the inner clamping unit 66 and the outer clamping unit 67 of the two clamping heads 5, 7 can then be closed in order to clamp the workpiece 2 in the clamping heads 5, 7.
  • the first support pad 25 can be moved downwards and thus disengaged in order to enable the workpiece 2 to be freely deformed by the plunger 15.
  • the two clamping heads 5, 7 can be moved symmetrically away from one another in the pulling direction 13, and a pulling force can thereby be applied to the workpiece 2.
  • the plunger 15 can be moved towards the workpiece 2 in the pressure direction 16 and deform it. During this deformation process, the total length of the workpiece 2 is shortened due to the deformation. It is therefore necessary for the clamping heads 5, 7 to yield in the direction of the center 18 of the plunger 15 in order to be able to maintain a certain tensile force.
  • clamping heads 5, 7 are displaced in such a way that the center 19 of the workpiece 2 remains in the center 18 of the plunger 15 during the bending process.
  • clamping heads 5, 7 are freely pivotable in the respective clamping receptacle 4, 6 in order not to apply any bending moment to the workpiece 2, but rather around the workpiece 2 on its first side 8 or on its second side 9 with a clean To claim tensile force.
  • the workpiece 2 can be received in the insert groove 38 of the plunger 15. It can be provided here that the groove walls 40 and 41 serve to stabilize the workpiece 2 or prevent bulges on the workpiece 2.
  • the groove walls 40, 41 are kept at a predetermined distance 42 from one another during the entire forming process or that the distance 42 between the two groove walls 40, 41 and thus the workpiece is reduced only after the forming process has ended 2 is pressed into shape.
  • the two groove walls 40, 41 are then removed from one another, and thus the distance 42 is increased, as a result of which the workpiece 2 is released.
  • the clamping units 66, 67 of the clamping heads 5, 7 can be opened and the workpiece 2 can thereby be released.
  • the second support pad 28, which serves to hold the finished, formed workpiece, can then be moved upwards.
  • the clamping heads 5, 7 can then be displaced away from the workpiece 2 so that they disengage from the workpiece 2.
  • the workpiece 2 thus rests on the second support pad 28 and can be removed from the stretch bending machine 1.
  • the second support pad 28 can then be shifted downwards and the first support pad 25 for receiving the new workpiece 2 can be shifted upwards.
  • the pressure stamp 15 are moved to its starting position.
  • the clamping heads 5, 7 can be moved back into their starting position by means of the actuator 50.
  • Fig. 8 shows a schematic representation of a first exemplary embodiment of a core 89.
  • the core 89 has several core segments 90 which are coupled to one another by means of a connection 91.
  • the segmentation of the core 89 makes it flexible in its longitudinal extension and can adapt to the curvature of the workpiece 2.
  • the connection 91 of the individual core segments 90 can be implemented, for example, by means of a leaf spring. As an alternative to this, it can also be provided that the individual core segments 90 are coupled to one another by cables.
  • the core 89 is inserted into the workpiece 2 designed as a hollow profile before the bending process. During the bending process, the core 89 then serves to ensure that the cross-section of the workpiece 2 is retained to some extent and that it does not buckle or buckle. After the end of the bending process, the core 89 can be pulled out of the workpiece 2 again.
  • FIG. 11 shows another embodiment of a core 89.
  • the core 89 is used, for example, for bending open profiles, such as a C-profile. It can be provided here that the core 89 has corresponding recesses into which the leg or legs of the workpiece 2 are inserted. During the bending process, the legs of the workpiece 2 are guided and can therefore be protected against buckling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP17757664.2A 2016-07-07 2017-07-07 Streckbiegemaschine und verfahren zum verformen eines werkstückes Active EP3481565B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50606/2016A AT518648B1 (de) 2016-07-07 2016-07-07 Streckbiegemaschine und Verfahren zum Verformen eines Werkstückes
PCT/AT2017/060169 WO2018006113A1 (de) 2016-07-07 2017-07-07 Streckbiegemaschine und verfahren zum verformen eines werkstückes

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EP3481565A1 EP3481565A1 (de) 2019-05-15
EP3481565B1 true EP3481565B1 (de) 2020-08-19

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CN (1) CN109661282B (zh)
AT (1) AT518648B1 (zh)
DE (1) DE202017007152U1 (zh)
ES (1) ES2832653T3 (zh)
WO (1) WO2018006113A1 (zh)

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CN111633080A (zh) * 2020-06-03 2020-09-08 明达铝业科技(太仓)有限公司 一种防撞梁拉弯成型工艺及其拉弯设备
CN112275863B (zh) * 2020-10-28 2024-07-02 广东高谱弯曲技术有限公司 一种型材拉弯设备
CN118492739B (zh) * 2024-07-18 2024-09-24 佛山市固特家居制品有限公司 一种室内隔断门加工设备

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Publication number Priority date Publication date Assignee Title
US2889864A (en) * 1959-06-09 Apparatus for stretch-wrap forming metal workpieces
US2459132A (en) * 1943-06-07 1949-01-11 Goodyear Aircraft Corp Metal bending and stretching apparatus
US4803878A (en) * 1987-01-20 1989-02-14 The Cyril Bath Company Method and apparatus for forming elongate tubular members into a predetermined shape while extrusion is gas pressurized and product
US5327764A (en) * 1993-04-05 1994-07-12 Aluminum Company Of America Apparatus and method for the stretch forming of elongated hollow metal sections
US5735160A (en) * 1997-04-15 1998-04-07 Aluminum Company Of America Stretch forming metal bodies with polymeric internal mandrels
EP0856367A3 (en) * 1997-01-31 2001-01-31 Aluminum Company Of America Stretch forming metal bodies with polymeric internal mandrels
JP5848535B2 (ja) * 2011-07-05 2016-01-27 川崎重工業株式会社 ストレッチフォーミング装置
JP6091148B2 (ja) * 2012-10-12 2017-03-08 Ntn株式会社 電動リニアアクチュエータ
JP5961088B2 (ja) * 2012-10-16 2016-08-02 川崎重工業株式会社 ストレッチフォーミングシステムおよびストレッチフォーミング方法
KR101465997B1 (ko) * 2012-12-13 2014-11-27 주식회사 성우하이텍 벤딩 프레스용 클램핑 장치
CN104525646A (zh) * 2014-11-26 2015-04-22 安徽科瑞科技发展有限公司 拉弯装置和拉弯机

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DE202017007152U1 (de) 2019-10-01
EP3481565A1 (de) 2019-05-15
AT518648A4 (de) 2017-12-15
CN109661282A (zh) 2019-04-19
WO2018006113A1 (de) 2018-01-11
CN109661282B (zh) 2021-03-09
ES2832653T3 (es) 2021-06-10
AT518648B1 (de) 2017-12-15

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