EP3424606A1 - Dispositif et procédé de pliage des pièces à usiner en forme de tôle à superposition de contrainte de compression simultanée - Google Patents

Dispositif et procédé de pliage des pièces à usiner en forme de tôle à superposition de contrainte de compression simultanée Download PDF

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Publication number
EP3424606A1
EP3424606A1 EP18000560.5A EP18000560A EP3424606A1 EP 3424606 A1 EP3424606 A1 EP 3424606A1 EP 18000560 A EP18000560 A EP 18000560A EP 3424606 A1 EP3424606 A1 EP 3424606A1
Authority
EP
European Patent Office
Prior art keywords
bending
punch
workpiece
sheet
sheet metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18000560.5A
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German (de)
English (en)
Inventor
Erman A. Tekkaya
Rickmer Meya
Christian Heinrich Löbbe
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.)
Technische Universitaet Dortmund
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Technische Universitaet Dortmund
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Filing date
Publication date
Application filed by Technische Universitaet Dortmund filed Critical Technische Universitaet Dortmund
Publication of EP3424606A1 publication Critical patent/EP3424606A1/fr
Withdrawn legal-status Critical Current

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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0263—Die with two oscillating halves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • the invention relates to a device for bending sheet-like workpieces with simultaneous compressive stress superposition according to the preamble of claim 1 and a corresponding method according to the preamble of claim 14.
  • the EP 2 001 615 B1 does not aim at compressive stress overlay during the process. Only compressive stresses are superimposed in the vertical direction. The damage to the sheet-shaped workpiece in the bending zone during bending forming is unavoidable. This compressive stress superimposition takes place after completed free-form bending, in order then to change the state of tension with regard to springback. This also causes an unwanted flattening of the bending zone.
  • Object of the present invention is therefore to provide a method and an apparatus in which the bending deformation significantly improved by targeted pressure stress superposition in the bending zone and the bending result is optimized.
  • the invention in terms of the device is based on a device for bending sheet-like workpieces with simultaneous compressive stress superposition, in which at least one bending punch movably arranged relative to the bending punch plastically deforms the sheet-like workpiece.
  • a generic device is further developed in an inventive manner that single or multiple bending abutment on one side or both sides of the bending line on the sheet-like workpiece and at least individual Biegeauflager are rotatably mounted such that these Biegeauflager in the progressive bending of the sheet-like workpiece between the punch and Biegeauflagern with arranged on the bending line portions of the sheet-like workpiece synchronously with pivot, said bending abutment apply such a force in the bending line and near the bending line on the sheet-like workpiece that at least in the bending line and near the bending line normal stresses always perpendicular to along the bending line arranged portions of the bending sheet metal workpiece generated and the stresses acting there are superimposed due to the bending.
  • the mitschwenkenden Biegelager be in the device according to the invention, for example via a guide with a defined pivot point targeted compressive stresses on the sheet metal workpiece to be bent in the region of the bending zone applied.
  • the height of the compressive stress superposition is flexibly adjustable and is also possible via the process both variably and constantly.
  • the compressive stress introduction reduces the tangential stresses in the sheet metal workpiece.
  • the device according to the invention is able to extend the flexibility of especially high-strength materials.
  • the compressive stress superposition influences the failure and damage behavior of the sheet metal workpiece.
  • the strain limits can be increased by compressive stress overlays. This is especially relevant for high and ultra-hard materials.
  • the material damage is delayed by compressive stress superimpositions, so that correspondingly produced sheet metal workpieces perform better in the performance test.
  • the residual stresses and the springback behavior can be positively influenced by the compressive stress superpositions.
  • small radii inner radius in the size of the bending punch radius
  • the common free-bending methods form the bending radius freely and these bending radii are much larger.
  • the bending radius can be adjusted independently of the bending angle. Due to the guidance of the sheet and the pressure forces acting no more free bending takes place and the bending contour is specified. It can thus be defined defined bending radii. Compared to elastomer bending, the device is wear-free and controllable.
  • the non-pivotally formed bending abutment may be formed as clamping elements which clampingly support portions of the bending sheet metal workpiece. This makes it possible to perform unilateral and non-symmetrical bending operations by a first sheet metal portion of the bending line held only by clamping, but not actively bent itself, whereas an opposite sheet metal section by means of the pivoting Bending support is bent according to the invention. In this case, however, the bending abutments designed as clamping elements may possibly also perform a pivoting movement.
  • the pivotally formed Biegeauflager are mounted so that the Biegeauflager pivot due to the force of the punch with increasing bending of the sheet metal workpiece and support the bending sheet metal workpiece.
  • the bending punch pushes in its bending movement on the sheet metal workpiece and thus also on the pivotally formed Biegeillerlager, which can retreat due to their storage against this movement of the punch and thereby perform a defined pivoting movement.
  • the pivoting movement of the Biegeauflager and thus the bending of the voltage applied to the bending metal plate workpiece takes place synchronously, whereby the bending sections of the sheet metal workpiece are permanently supported and acted upon by the counterforce of the Biegeiller.
  • This counterforce of the bending abutment then generates, at least in the region of the bending zone, the normal stresses which are superimposed on the stresses prevailing in the bending zone and significantly improve the forming behavior of the sheet metal workpiece in the bending zone as described above.
  • the pivoting of the pivotally formed bending abutment about a pivot axis can take place, which runs along or near the bending line of the sheet metal workpiece to be bent.
  • the bending abutments are designed and mounted so that the pivot axis is collinear or parallel adjacent to the bending line of the sheet metal workpiece to be bent and therefore in the region of the bending zone.
  • At least individual bending abutments are designed as swivel jaws, which are arranged on one side or bilaterally symmetrically the bending line pivotable.
  • Such swivel jaws can allow a full-surface or adjacent to the actual bending zone large-scale support of the sheet metal workpiece to be bent and in the unactuated state of the device support the still flat sheet metal workpiece completely.
  • With increasing stroke the bending die back the swing jaws against the punch and pivot substantially around the bend line around such that they pivot synchronously to the increasing bending of the sheet metal workpiece and the sheet metal work continuously supported at least near the bending line and lead.
  • the support of the sheet metal workpiece during the entire bending process is achieved, on the other hand can be applied by the force of the swing jaws against the force of the punch the already described normal forces continuously on the sheet metal workpiece that these forces perpendicular to each changing position of the bent Run sections of the sheet metal workpiece and produce the normal stresses perpendicular to the bent portions of the sheet metal workpiece.
  • This continuous adaptation of the position of the swivel jaws to the respective bending state of the sheet metal workpiece can be achieved in that the swivel jaws of the bending abutments project into a guide carriage with an end region arranged close to the bend line, with swivel jaws and guide carriages having opposite and correspondingly formed guide surfaces against which move the end portions of the Biegeauflager and the guide surface of the guide carriage with the increasing bending of the sheet-like workpiece relative to each other and support each other.
  • the guide carriage forms a kind of forced sliding bearing of the end portions of the swivel jaws, on which the swivel jaws can be supported safely guided when the swivel jaws back against the lowering punch and pivot it.
  • the guide carriage itself is also mounted so that it can retreat from the sinking punch, but at the same time as described can apply a force against the direction of force of the sinking punch on the swing jaws.
  • the guide surface of the guide carriage can be formed recessed approximately semicircular and formed the guide carriage associated end portions of the pivoting jaws at least partially semicircular protruding.
  • the respective semicircular designs of guide slide and swivel jaws define the pivoting movement of the swivel jaws and at the same time allow the transmission of forces from the punch to the sheet metal workpiece and the opposing forces from the guide carriage on the swivel jaws and thus also on the sheet metal workpiece.
  • the guide carriage can be loaded with a compressive force directed essentially counter to the direction of force of the bending punch, which is perpendicular to the end areas of the swivel jaws and the pivoting bending abutments at any time via the guide surface of the guide carriage
  • a compressive force directed essentially counter to the direction of force of the bending punch which is perpendicular to the end areas of the swivel jaws and the pivoting bending abutments at any time via the guide surface of the guide carriage
  • Forming area of the bending sheet-like workpiece is transmitted and causes a normal stress superposition in the bending line and near the bending line.
  • the force directed counter to the direction of force of the bending punch can be generated mechanically and / or pneumatically and / or hydraulically and / or electromechanically.
  • the force directed against the direction of force of the bending punch is constant or dependent on the bending state of the bending sheet metal workpiece, in particular force or path-dependent, controllable.
  • the reaction force is controlled depending on the force of bending force or path-dependent on the way of the punch or dependent on other geometric or material-dependent bending sizes.
  • Another possibility for selectively influencing the bending in the region of the bending zone can be achieved by arranging recesses or shapes, in particular pockets or projections, in the region of the installation of the sheet metal workpiece to be bent on the swivel jaws, by which the force introduction of the normal stresses can be influenced influencing normal forces in the sheet metal workpiece to be bent, in particular in the area around the bending line around concentrable.
  • radius-like projections can be provided, which couple the normal forces very close to the bending line in the sheet metal workpiece and thus specifically support and burden precisely this sensitive area of the bending deformation. Further away from the bending line area of the sheet metal workpiece, however, can be specifically relieved by eg pocket-like recesses.
  • the pivot axis of the bending abutment is aligned parallel to the central axis of the punch radius of the punch, preferably collinear to the central axis of the punch radius of the punch. This makes it possible to achieve a very accurate formation of the actual bending radius.
  • the pivot axis of the Biegeauflager is aligned spaced from the central axis of the punch radius of the punch, approximately parallel to the movement of the punch above or below the actual bending line. As a result, the bending behavior in the actual bending zone can be further selectively influenced and controlled.
  • an adjustment so between bending abutment and extending along the bending line portions of the bending sheet metal workpiece are arranged so that the distance between Biegeauflager and along the bending line extending portions of the bending sheet metal workpiece is adjustable to each other, so that the Pivot axis of the bending abutment spaced from the center axis of the punch radius of the punch is aligned.
  • opposing and with the pivoting jaws of the Biegeauflager cooperating clamping elements are arranged, which support together with the pivoting jaws along the bending line extending portions of the bending sheet metal workpiece and / or clamp.
  • the sheet metal workpiece to be bent during bending is not only supported over the entire surface, but can also be supported or clamped against the swivel jaws, which can be further eliminated unwanted material displacements of the sheet metal workpiece to be bent.
  • the clamping elements are charged tangentially with thrust forces that transmit the clamping elements on the along the bending line extending portions of the bending sheet metal workpiece. This can be about Tangentialhisen are selectively introduced in the area of the sheet metal workpiece, which act in the direction of the bending zone to or from the bending zone and additionally influence the flow of the material in the bending zone.
  • the pivoting jaws of the Biegeauflager in a region below the bearing surfaces for the sheet metal workpiece to be bent recesses or shapes, in particular pockets or recesses, having a larger pivot angle of the Biegeauflager to each other and thus an increase in the bendable angle of allow to be bent sheet metal workpiece.
  • a reduction in the mutual influence of the swivel jaws of the bending abutment is to be striven for and to ensure that even with such larger bending angles the support and power transmission between guide carriage and swivel jaws is always safe possible.
  • the pivoting jaws of the Biegeillerlager are designed such that in each case diametrically comb-like portions of the bending line arranged adjacent end areas alternately interlock and the swing jaws of the Biegeauflager thereby penetrate each other.
  • the comb-like sections virtually interlock the penetrating end portions of the swivel jaws and therefore still allow a secure support and power transmission between the guide carriage and swivel jaws, when the swivel angle is greater than 90 °.
  • the bending punch is formed from at least two segments which abut along the bending line on the sheet-like workpiece and are rotatably mounted such, and the bending punch segments pivot in synchronism with the increasing bending of the sheet-like workpiece between the bending punch and Biegeauflagern with arranged along the bending line portions of the sheet-like workpiece.
  • the sheet-like workpiece is additionally supported flat surface opposite to the pivoting jaws, whereby a lifting of the sheet-like workpiece can be excluded from the pivoting jaws when performing the bending operation and concomitant material deformations.
  • the bending punch segments pivot in synchronism with the axis of the bending inner arc of the bending sheet-like workpiece, as this can be achieved during the entire bending process described additional counter-support of the sheet-like workpiece.
  • the bending punch segments pivot synchronously with the pivoting movement of the swivel jaws of the bending abutment.
  • the bending punch segments are rotatably mounted to each other in a guide surface of a punch guide, wherein the bending punch segments pivot upon bending of the bending punch guide with the bending force to each other around the bending line.
  • This arrangement corresponds essentially to the storage and management of the swivel jaws of the Biegeauflager and is structurally simple and robust executable.
  • the guide surface of the punch guide can also be formed approximately semicircular recessed and the bending punch guide associated end portions of the punch segments are at least partially also formed semicircular protruding.
  • the bending punch segments in the region of the axis of the bending inner bow to each other comb-like and with the comb-like projections are formed alternately interlocking, so that just in the area of the actual bending zone, the bending punch segments are very securely fixed to each other or formed mutually guided can.
  • the invention further relates to a method for bending sheet-like workpieces with simultaneous compressive stress superposition, wherein at least one relative to bending supports movably arranged bending punch plastically deforms the sheet-like workpiece, in which the sheet-like workpiece is supported on one side or both sides of the bending line of single or more Biegeauflager, the abut the sheet-like workpiece and rotate at least individual bending supports rotatably synchronized with the progressive bending of the sheet-like workpiece with arranged on the bending line portions of the sheet-like workpiece with these Biegeauflager apply such a force in the bending line and near the bending line on the sheet-like workpiece, that at least in the area of the bending line and near the bending line normal stresses always perpendicular to be arranged along the bending line sections of the bending sheet metal workpiece produce t and the stresses acting there due to the bending are superimposed.
  • the normal stress superposition lies in the region of the bending line and near the bending line in the plastic region of the material deformation of the bending sheet metal workpiece.
  • the yield strength is exceeded and specifically the component tapers in the bending radius or predetermined a sheet thickness profile.
  • the method further allows by the full-surface support of the sheet metal workpiece bending of soft or slippery material, preferably forming the sheet metal workpiece in the heated state of soft metals or fiber-reinforced plastics.
  • thermoelectric bending by direct heating, in particular by means of current conduction, or indirect heating, in particular by heating the device, whereby the bending of brittle and hardened metals can be improved by such a temperature-assisted bending.
  • FIG. 1 shows a schematic representation of the arrangement of the components of the device 1 according to the invention during the bending deformation of a sheet metal workpiece 2 between a bending punch 3 and a split and rotatably mounted bending support 4 in a three-dimensional view.
  • a swivel jaws 4 Biegelager 4 can pivot about a defined pivot point 9.
  • the swivel jaws 4 can be mirror-symmetrically identical components, wherein each swivel jaw 4 is substantially plate-shaped with a support area 7 for the sheet metal workpiece 2 and a protruding portion 6, which is approximately semicircular with a guide surface 13 bulges.
  • This guide surface 13 projects downward in the direction of a guide carriage 5 and is received in a recess of the guide carriage 5.
  • the here approximately quarter-circular radius of the swivel jaws 4 and the approximately semicircular recess 12 of the guide carriage 5 are chosen so that the swivel jaws 4 supported in the semicircular recess 12 of the guide carriage 5 can rotate and the pivot point 9 of the swivel jaws 4 in the center the stamp radius of the punch 3 is located. This ensures that the outer bending radius of the sheet metal workpiece 2 remains constant.
  • the guide surface 13 thus provides the contour of the bent sheet metal workpiece 2.
  • the pivoting jaws 4 In an initial position before the deformation of the sheet metal workpiece 2, the pivoting jaws 4 are flat on a Gesenka 8, while the Biegumformung they rely on the hinge bearing 8 with increasing bending of the sheet metal workpiece 2 on the Gesenkingen 8 from.
  • the punch 3 loads the sheet metal workpiece 2 and thus the swivel jaws 4. Because of the pivotable mounting of the swivel jaws 4 in the guide slide 5, the swivel jaws 4 pivot under this load and after more and more, the deeper the bending punch 3 moves.
  • the angle ⁇ between the two pivoting jaws 4 increases, as shown in more detail in the FIGS. 2a to 2c It can be seen that represent a kind of stadium plan of the bending deformation of the sheet metal workpiece 2.
  • the pivot point 9 of the pivoting movement of the swivel jaws 4 remains constant, here as shown in the center of the punch radius of the punch 3.
  • This counterforce 11 is thereby always introduced by the bearing of the swivel jaws 4 in the swivel jaws 4, that these force components F Res is directed perpendicular to the sheet plane of the deforming sheet metal workpiece 2, so as indicated by the normal force distribution 14 perpendicular to the two laterally of the bending line 28 extending support areas. 7 the swivel jaws 4 extend.
  • This normal force distribution 14 acts on the acted upon sections of the sheet metal workpiece 2 as a compressive stress, which is superimposed on the voltages acting in these sections of the sheet metal workpiece 2 due to the bending and the above detailed produces beneficial effects on the bending deformation and the formation of the curved contour of the sheet metal workpiece 2.
  • the guide carriage 5 may be connected for applying the counterforce 11, for example, with a hydraulic cylinder, not shown.
  • a hydraulic cylinder By means of such a hydraulic cylinder, it is then possible to specify exactly the desired compressive stress superposition on the basis of the normal force distribution 14 during the bending process.
  • the applied force 11 can also be applied by electrical or mechanical forces, for example by spring systems. Because the force 11 can be adjustable, the height of the normal force distribution 14 and thus the compressive stress superposition in the sheet metal workpiece 2 can also be adjusted.
  • the normal force distribution 14 and thus the compressive stress superposition should be in the elastic range of the material of the sheet metal workpiece 2, so that the Tangentialhisen be reduced in the sheet metal workpiece 2, but little to no additional thinning takes place in the region of the bending radius of the sheet metal workpiece 2.
  • almost identical component end geometries of the sheet metal workpiece 2 can be produced with different load history.
  • the additional force 11 for example from a hydraulic cylinder, always acts vertically from below, since the guide carriage 5 is guided axially.
  • a radius-shaped projection 23 can be arranged directly in the region of the bending zone, which merges chamfered in the support region of the pivoting jaws 4 in order to obtain a smaller contact surface between guide carriage 5 and pivoting jaws 4.
  • the force is guided perpendicular to the punch 3.
  • the same goal is achieved in that a pocket is introduced into the guide surface 13 of the swivel jaws 4, which limits the power transmission to the forming zone. A combination of both adjustments is possible and useful.
  • a kind of counter-holder pushes the sheet metal workpiece 2 on the receding and pivoting pivoting jaws 4 or determines the pivoting jaws 4 in any other way.
  • Such an anvil is not necessarily necessary because it does not introduce forces into the sheet metal workpiece 2 for the bending deformation, but should primarily prevent a lifting of the outer edge regions of the sheet metal workpiece 2.
  • the counter-holder could also be designed as a pocket in the swivel jaws 4 or be introduced by attached tabs.
  • Another variant may be to firmly clamp the anvil with the swivel jaws 4. Then can be achieved in the bending zone by additional external forces on the anvil and thereby on the sheet metal workpiece 2 in the tangential direction an upsetting or thinning.
  • pivot point 9 of the support radius of the pivoting jaws 4 is structurally different, ie there would be no screws 15 or intermediate layers 18 necessary, the pivot point 9 is simply given directly by the design, for example, 1 mm below the radius center of the punch 3.
  • the swivel jaws 4 themselves each form two parts, wherein the halves of the swivel jaws 4 by a gap 17 from each other spaced apart from each other. Touch the swivel jaws 4, the sheet metal workpiece as in FIG. 4 shown only in sections on projections 16 and acts on the two halves of the pivoting jaws 4 additional force acting in the direction of the bending line 28 F together , so compressive stresses in sheet width directions can be applied and thus the flow behavior of the material of the sheet metal workpiece 2 is additionally affected in the bending zone ,
  • This gap 17 is then designed according to the elastic displacements and allows a compression stress superposition in the elastic region. Due to this compressive stress superposition, the stress state can additionally be positively influenced.
  • the generation of the voltage superposition described by means of the guide carriage and the swivel jaws 4 can in the in the FIGS. 1 and 2 described as long as forces transmitted until the radius of the pivoting jaws 4 from the guide surface 12 of the guide carriage 5 rotates out.
  • the swivel jaws 4 are formed changed.
  • the projecting portions 6 of the pivoting jaws 4 are extended in the direction of the respective other pivoting jaw 4 and arranged so entangled with each other that forms a kind of toothing between the pivoting jaws 4.
  • the extended portions 6 of the pivoting jaws 4 alternately engage in corresponding groove-like recesses of the other of the swivel jaw 4, so that the swivel jaws 4 can virtually interpenetrate into each other.
  • a flat contact between the guide surfaces 13 of the pivoting jaws 4 and the guide surface 12 of the guide carriage 5 is also possible for larger rotations of the pivoting jaws 4 and bending angle significantly over 90 °, up to about 130 ° and more. As a result, even with larger bending angles ⁇ still a voltage superposition take place.
  • FIG. 7 it is also possible, instead of a one-piece bending die 3 according to FIG. 1 or 2 to work with a multi-part bending punch 3, 3 ', the segments 3, 3' to each other by a distance 22 sections separated and also guided pivotally in a punch guide 20.
  • an approximately semicircular Recess 29 may be provided in the punch guide 20, in which the segments 3, 3 'are supported with opposing surfaces and are pivoted in the advancing movement 10 of the punch 3 by the angle ⁇ . This pivoting movement about the angle ⁇ is carried out in synchronism with the increasing bending deformation of the sheet metal workpiece 2 due to the contact conditions, as can be seen from the FIG. 8 can be seen.
  • a split punch 3, 3 has the advantage that the two parts punch 3, 3' press the sheet workpiece flat on the swivel jaws 4 and thus minimize a lifting of the sheet metal workpiece 2 of the swivel jaws 4 or other inadmissible deformations of the sheet metal workpiece 2 ,
  • the multi-part design de Biegestibilvs 3, 3 'increases with appropriate shaping in the region of the bending inner arch as in FIG. 8 illustrated the bearing surface of the sheet metal workpiece 2 at the region of the bending inner bow against a one-piece bending die 3, which can be reduced in strength disadvantageous notches of the bending inner bow or completely prevented.
  • a further concentration of the bending forces on the sheet metal workpiece 2 and thus the compressive stress superposition in or near the bending zone can be achieved in a multi-part bending punch 3, 3 ', that the contact area between the swivel jaws 4 and 2 sheet metal workpiece is formed suitable.
  • the portion of the swivel jaws 4 closest to the bending zone can be formed with a projection 23, to which a pocket-shaped recess 24 extends further outwards, in the region of which there is no direct contact between the swivel jaws 4 and the sheet metal workpiece 2.
  • the normal stresses 14 concentrate on the region of the projection 23.
  • the embodiment with a split bending punch can according to FIG. 6 be used to that on the sheet metal workpiece only a one-sided bending deformation is performed.
  • a pivoting jaw 4 and a punch segment 3 is provided on the other side of the bending line 29, this section of the sheet metal workpiece 2 is merely fixed in a jaw-like clamping device 21, without being bent symmetrically to the other side of the bending line 29 as well.
  • FIGS. 10 and 11 show an embodiment with a split punch 3, 3 ', in which, as already described, the two punch segments 3, 3' by means of a punch guide 20 is pivotally actuated and move synchronously to the pivoting of the swivel jaws 4. But in addition, as in the enlarged detail of the FIG. 11 a single pivoting jaw 4 to better recognize the two segments 3, 3 'of the punch through a lateral pivot bearing 26 to each other and additionally assigned by means of matching toothing 27 each other. This makes it possible to apply axial forces to the segments 3, 3 'of the bending punch in the direction of the bending axis 29 in order to positively influence the flow behavior of the sheet metal workpiece 2 in the bending zone.
  • the invention thus ensures a defined and variable application of compressive stresses at a nearly constant bending radius and variable bending angles.
  • inventive method allows under high compressive stresses even at room temperature, the extension of process limits (martensitic steels, magnesium alloys, titanium alloys). Although the design appears structurally simple umetzbar, the pressure-voltage superposition is made possible in a previously unknown manner by the special tool design. Due to the multiple use of high-strength metal materials, the inventive method is a future-oriented method, which is particularly important for industrial applications because of the simple tool and the flexible adjustment options.
EP18000560.5A 2017-06-28 2018-06-26 Dispositif et procédé de pliage des pièces à usiner en forme de tôle à superposition de contrainte de compression simultanée Withdrawn EP3424606A1 (fr)

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DE102017006218.8A DE102017006218A1 (de) 2017-06-28 2017-06-28 Vorrichtung und Verfahren zum Biegen von blechartigen Werkstücken bei gleichzeitiger Druckspannungsüberlagerung

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* Cited by examiner, † Cited by third party
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CN116493448A (zh) * 2023-05-19 2023-07-28 广东福临门世家智能家居有限公司 一种用于门窗制造的金属件压制折弯装置
CN116493448B (zh) * 2023-05-19 2023-12-12 广东福临门世家智能家居有限公司 一种用于门窗制造的金属件压制折弯装置

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