EP2231346A2 - Procédé de flexion d'une pièce - Google Patents

Procédé de flexion d'une pièce

Info

Publication number
EP2231346A2
EP2231346A2 EP09700144A EP09700144A EP2231346A2 EP 2231346 A2 EP2231346 A2 EP 2231346A2 EP 09700144 A EP09700144 A EP 09700144A EP 09700144 A EP09700144 A EP 09700144A EP 2231346 A2 EP2231346 A2 EP 2231346A2
Authority
EP
European Patent Office
Prior art keywords
bending
workpiece
cheeks
holding
cheek
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.)
Granted
Application number
EP09700144A
Other languages
German (de)
English (en)
Other versions
EP2231346B1 (fr
Inventor
Wilhelm Schwarz
Bernd Engel
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.)
EDAG GmbH and Co KGaA
Original Assignee
EDAG GmbH and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EDAG GmbH and Co KGaA filed Critical EDAG GmbH and Co KGaA
Publication of EP2231346A2 publication Critical patent/EP2231346A2/fr
Application granted granted Critical
Publication of EP2231346B1 publication Critical patent/EP2231346B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
    • 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

Definitions

  • the invention relates to a method for bending a workpiece.
  • the method is particularly suitable for bending flat sheets and open sheet metal profiles.
  • the invention also relates to a bending tool which is suitable for carrying out the bending process.
  • the invention relates to a component bent out of the workpiece by the method and its preferred use as a structural element in a vehicle, preferably as a structural element of a body of a motor vehicle.
  • Automotive bodies are joined by a variety of structural elements. By reducing the joining operations costs can be saved. A reduction in the number of joined components also has a positive effect on the tolerance chain. With regard to the cost also plays a role that changes in the geometry of the structural elements, for example, from vehicle model to vehicle model, associated with costly adjustments of the production tools, especially when using complex forming processes such as deep drawing.
  • thermoforming forming process A cheaper compared to thermoforming forming process is the bending, but along with a limitation of the manufacturable by bending operations geometries.
  • a bending method is known for the production of tubular structural elements, which are formed into a non-circular shape by pressing straight tube pieces to an arcuate shape and thereby correspondingly bending the contour of the mold. If structural elements are to be bent in a circle, the profile pivot bending offers itself as an inexpensive bending method.
  • the profile pivot bending and bending method of US 4,712,406 are limited to bending about an axis parallel to the plane of the sheet.
  • the invention proposes a bending process for forming in which the workpiece to be formed is held in a holding engagement by means of a holding device and is clamped and bent by means of a frictional connection between bending cheeks in a bending section protruding from the holding device in the longitudinal direction.
  • the bending deformation is introduced into the workpiece by moving the bending cheeks with the clamped bending portion relative to the holding means by means of a rotational movement from a first bending cheek position to a second bending cheek position.
  • the bending force causing the bending or at least a predominant part of the bending force is introduced into the bending section by means of a frictional force acting in the frictional engagement of the bending cheeks and the bending section.
  • a frictional force acting in the frictional engagement of the bending cheeks and the bending section is introduced into the bending section by means of a frictional force acting in the frictional engagement of the bending cheeks and the bending section.
  • open profiles preferably sheet-metal profiles
  • the method is particularly suitable for bending angle profiles, such as L, T, U or double-T profiles, wherein preferably a long leg of the profile is clamped and deformed according to the invention in the plane of the respective leg by bending.
  • the invention is particularly advantageous for the transformation of flat sheets and open sheet metal profiles with at least one flat leg, it is not limited thereto, but for example also suitable for round curved, preferably flat sheets or profiles with corresponding profile legs.
  • a portion of the bending section remains free of clamping forces.
  • the workpiece has in the bending or each bending step respectively in a holding engagement with the holding device holding portion, in the bending section clamped between the bending cheeks section and between this section and the holding section on the free portion which is attributed to the bending section.
  • the bending deformation caused by the movement of the bending cheeks into the second bending cheek position takes place at least for the most part in the free part section. Theoretically, it is conceivable that the free section in the bending forming the entire forming area of the workpiece.
  • the workpiece is stretched and thus thinned out in the tensile stress region during bending transformations in which it experiences tensile stresses in the deformation region, so that in the thinned region the frictional engagement weakens and accordingly the clamping force decreases.
  • the workpiece can also be subjected to pressure on its outer bow side during bending deformation and at the same time on its inner side of the sheet to pressure, namely, if a neutral fiber extends within the workpiece.
  • the workpiece Due to the differences in tension occurring in the bending region, the workpiece can also be stretched or compressed in the clamping region of the bending cheeks and in frictionally engaged holding engagement in the clamping region of the holding device.
  • the expansion of the deformation region into the clamping region can be counteracted, for example, by an increase in the clamping force in the respective clamping region or by an increased flexibility of the clamping surfaces of the bending cheeks or of the holding device.
  • the word "or” is understood here as everywhere else in the usual logical sense, thus encompassing both the meaning of "either ... or” as well as the meaning of "and”, as far as nothing else can only result from the context ,
  • the bending cheeks are rotationally in the bending deformation from the first bending cheek position, for example, only rotated or moved along a curved path in the second bending position.
  • the curved path may in principle have an arbitrarily curved course, preferably the curved path is a circular arc.
  • the curved path can, for example,
  • the bending cheeks are preferably arranged rotatable or pivotable, that is rotatable about a real and not only virtual axis of rotation rotatably, expediently with a single degree of freedom of the rotational movement.
  • the axis of rotation about which the bending portion of the workpiece is formed is preferably a stationary tool axis, but in principle can also be changed in the course of the bending deformation of the place.
  • the bending method according to the invention is assigned to the class of the swivel bending method, but with respect to the alignment of the frictionally acting frictional force and the resulting Kempermkraft on the one hand and the orientation of the curved path of the bending cheeks, in preferred simple embodiments of the orientation of the axis of rotation, on the other hand.
  • the workpiece is preferably a metal sheet and may in particular be a steel sheet or else a metal sheet of another metal alloy, for example a light metal sheet. It has a thickness of preferably at most 5 mm and preferably at least 0.5 mm, wherein the thickness can vary over the width of the workpiece in adaptation to the tensile or compressive forces occurring during the bending deformation.
  • the width measured transversely to the thickness and the tensile or compressive forces occurring during the bending deformation is preferably not more than 20 cm, but in principle is not limited. Widths between 5 and 15 cm are particularly preferred.
  • the length of the workpiece to be formed is arbitrary, as long as a holding by the holding device and a clamping is ensured by the bending cheeks.
  • the holding device holds the workpiece in a holding section with sufficient holding force so that the Umforrn alloy work in the workpiece depending on the location of the axis of rotation as tensile forces or compressive forces, the workpiece is thus stretched or compressed. If the axis of rotation extends through the workpiece, the workpiece is subject to tensile stress on one side of the neutral fiber and on the other side of a load on the other side during bending deformation across its width.
  • the holding device holds the holding portion of the workpiece preferably by friction only by clamping.
  • the holding device can advantageously also form a side guide for the workpiece.
  • the bending method according to the invention is particularly suitable for the incremental bending of workpieces, in which the workpiece is bent stepwise to further bend it after performing a first bending step in at least one further bending step, preferably in several other small bending steps.
  • the arc created by the bending deformation is thus composed of several arc increments, which are generated one after the other.
  • the frictional engagement of the bending cheeks and the holding engagement of the holding device can also be achieved simultaneously.
  • the workpiece is moved forward to a new workpiece position relative to the holding device in the direction in which the bending section protrudes from the holding device. In the new workpiece position of the holding engagement is restored, and the workpiece is clamped in its now further protruding from the holding device bending section of the bending cheeks again in frictional engagement. Then the next bending step is carried out.
  • the successive executed bending steps can be identical to each other.
  • the bending cheeks with the clamped bending section cover a longer or a shorter path than in the case of a previously performed bending step or the axis of rotation of the bending deformation is changed in place.
  • the method according to the invention provides such flexibility, at least in principle, since it is possible to dispense with an edge to be bent or another type of installation to which the workpiece is applied during bending deformation.
  • the movement of the bending cheeks is a simple turning or pivoting movement about a rotational axis fixed for the bending tool.
  • the turning or swiveling angle may be the same at each bending step or may be changed, for example, in adaptation to a varying thickness or material strength or a varying width in the longitudinal direction of the workpiece, which also includes the case of a variation in several of these parameters.
  • a bending tool suitable for carrying out the bending process has the holding device and the bending cheeks, namely a first bending cheek and at least one further, second bending cheek, between which the workpiece can be clamped in the bending section with a clamping force.
  • the bending cheeks are rotationally movable relative to the holding device about the said axis of rotation for the bending deformation.
  • the rotational axis may be variable in an incremental bending between successive bending steps, for example, be displaced parallel, but in preferred simple embodiments, it is stationary with respect to the bending tool.
  • the axis of rotation relative to the clamping force exerted on the workpiece by the bending cheeks is parallel or at least substantially parallel, whereby a rotation axis which has an inclination of at most 30 ° to the clamping plate is also considered substantially parallel.
  • the bending cheeks have mutually facing clamping surfaces, which are pressed for clamping against the bending portion of the workpiece in order to clamp this frictionally.
  • the clamping engagement with the workpiece may be purely frictional, but may alternatively include a positive connection. It may be one of the bending cheeks or it may have both bending cheeks raised in their respective clamping surface upstanding embossing surfaces to stamp the workpiece in clamping engagement.
  • the workpiece has in cross-section an open profile with a first leg to be clamped between the bending cheeks and a second leg, preferably a shorter leg, which has an inclination to the first leg
  • the second leg is laterally supported during the bending deformation in order to counteract a change in the inclination, preferably to prevent a change entirely.
  • the bending cheek in question forms in such embodiments a contact surface for the second leg.
  • Ceibbeanspuchung there is a tendency that the second leg in the direction of the withdrawn first thigh and the inclination is thereby reduced.
  • a lateral support and guidance in this sense is advantageous not only for a bending with respect to the outer second leg, but also for a bending in the inner edge of the clamped first leg extending second leg.
  • a bending for example, a U-shaped or double-T profile in which two or four second legs extend along the middle first leg, lateral support of each of the second legs is advantageous.
  • a stamp of a bending cheek serving as a side guide is made in one piece, the length of the punch measured along the bending line of the workpiece and accordingly the length of the side guide is limited.
  • segmentation of the punch is advantageous in order to extend the lateral support in the bending section.
  • the clamping surface can be lengthened and thereby increased for bending open profiles by segmenting the bending cheeks.
  • the individual segments are movably connected to each other so that together they form a clamping surface following the bending contour of the workpiece.
  • all segments can form clamping surfaces for clamping the workpiece.
  • a further, third segment may have an open position on its side facing the workpiece and accordingly form no clamping surface for the workpiece, but merely serve as a lateral support.
  • one or more of the segments can also serve only as clamping segments, but not at the same time as a lateral support.
  • one, preferably the segment arranged nearer to the holding device can serve as a clamping and support segment and the other segment only as a support segment or only as a clamping segment or, preferably, also as a clamping and support segment Clamping surface to the workpiece and extends during the bending deformation at any time up to the second leg of the workpiece.
  • a drive means by means of which the rotational movement of the bending cheeks can be effected, is preferably part of the bending tool, by being supported on a base of the tool and coupled to the bending cheeks. In this way, the power flow for driving the bending cheeks is closed within the bending tool.
  • the base on which the drive device is supported for example, be a base plate of the bending tool, via which the tool is supported on a press.
  • the press advantageously provides a delivery device by means of which the bending cheeks for generating the clamping force are movable toward one another and can be pressed against the bending section of the workpiece. The press can also get the parking.
  • the bending tool as such can be equipped with a stop device, so that a supply and Abstellin therapies is realized either from the press or from the press in combination with the bending tool.
  • the supply and Abstell drove preferably also concerned the manufacture and release of the retaining engagement of the holding device.
  • a feed device may be provided, which moves the workpiece between the individual bending steps in each case a bit forward, preferably pushes forward on a lower part of the holding device forward.
  • the feed device can also be supported within the bending tool or on a superordinate frame supporting the bending tool, for example the press mentioned.
  • a control device is provided which controls the drive means of the bending cheeks, the feed device and the supply and Abstellinraum so that the movements are coordinated with each other by the respective institutions.
  • the invention also relates to a component which has been shaped from the workpiece by the bending deformation according to the invention.
  • the component can be or contain an open sheet-metal profile which has been formed according to the invention, if it is an assembled component.
  • the component is preferably used as a structural element of a vehicle, preferably in or for a motor vehicle, trucks as well as passenger cars. Instead, it can also form a structural element of a rail vehicle or an aircraft or watercraft, preferably a frame structure, or be provided for installation in such a vehicle. It may in particular be provided or installed as a body structure of a motor vehicle, for example as a longitudinal member in a motor vehicle body.
  • Side members of motor vehicle bodies are often not only bent around one or more axes parallel to the width direction of the side member, but may also have a curved course with one or more arc portions extending around one or more axes extend, which is or are parallel to the direction in which the material thickness of the structural element is measured in each case.
  • the bend forming according to the invention is particularly suitable for shaping such sheets.
  • FIG. 1 shows a plan view of a workpiece which is deformed by bending
  • FIG. 2 shows a bending tool for bending deformation with the clamped workpiece in a side view
  • FIG. 3 shows the bending tool with the workpiece positioned for the bending deformation in a plan view of a lower part of the bending tool
  • FIG. 4 shows the bending tool in a perspective view
  • FIG. 5 shows the bending tool in a longitudinal section
  • Figure 6 shows a first modification of the bending tool
  • FIG. 7 shows a second modification of the bending tool.
  • Figure 1 shows a bending deformation, by means of which a workpiece 1 is bent by pivoting bending in several bending about a vertical axis Z of the workpiece 1 and thus to a "high edge".
  • the workpiece 1 may in particular be a flat sheet or an open sheet metal profile, for example a U or double T profile. For simplification purposes, it is assumed that it is a simply flat sheet.
  • the workpiece 1 is an elongated strip in the X direction, preferably a straight strip of any length, with a smaller width, on the other hand, which is measured perpendicular to the longitudinal direction X in the Y direction, and a significantly smaller thickness compared to the width shown in FIG the direction perpendicular to the longitudinal direction X and the transverse direction Y Z-direction, parallel to the vertical axis, is measured.
  • the workpiece 1 is bent about a rotation axis R parallel to the vertical axis Z.
  • An arc to be formed in the workpiece 1 is produced by incrementally bending in a sequence of successively executed bending steps.
  • the workpiece 1 is moved forward in each case by an incremental length 1 in a feed direction V between the bending steps.
  • FIG. 2 shows a bending tool in a side view with the tensioned workpiece 1.
  • the bending tool has a base plate 6, a cover plate 9 and between the plates 6 and 9, a holding device with a lower part 7 and an upper part 8 and further a rotary member 10, in the embodiment a Swivel part, with a first bending beam 11 and a second bending beam 12 on.
  • the tool is arranged in a press, of which a press table 5 is shown and which exerts on the cover plate 9 a directed towards the base plate 6 pressing force P to the workpiece 1 both in the holding device 7, 8 and in the rotary member 10 respectively to clamp in a frictional connection.
  • an inhibiting force K is generated by the pressing force P, with which the bending cheeks 11 and 12 clamp the workpiece 1.
  • This clamping engagement is purely frictional or based at least for the most part on frictional engagement.
  • the frictionally engaging frictional force is orthogonal to the clamping force K.
  • the rotary member 10 is in the tensioned state relative to the base and the cover plate 6 and 9 and in particular to the holding device 7, 8 about the rotation axis R pivotable.
  • the axis of rotation R is stationary with respect to the tool, in particular the holding device 7, 8.
  • the rotary member 10 is shown in two bending bending end positions, namely a first bending beam position occupied by the rotary member 10 before bending deformation and a second bending beam position in which the rotary member is designated 10 'and into which it moves during bending forming becomes.
  • the workpiece 1 is tensioned for the bending deformation in a holding section 2 by means of the holding device 7, 8.
  • a bending section of the workpiece 1 projects beyond the holding device 7, 8 in the direction of the bending cheeks 11 and 12 located in the first bending cheek position and is clamped between the bending cheeks 11 and 12 in frictional engagement.
  • the axis of rotation R is located within the inner radius of the clamped portion 4, so that the workpiece 1 in the forming area, which primarily forms the free portion 3, is claimed only on train over the entire width.
  • the tensile stresses to be absorbed by the holding device 7, 8 and the rotary part 10 are denoted by F in FIG.
  • the workpiece 1 After releasing the holding engagement, the workpiece 1 is moved by means of a feed device in the feed direction V to a new workpiece position.
  • the feed corresponds to the length 1 of the free section 3.
  • the holding device 7, 8 forms during the feed a side guide for the workpiece 1.
  • the workpiece 1 occupies the new workpiece position it is by means of the holding device 7, 8 in the on the lower part. 7
  • the rotary member 10 is pivoted again from the first bending cheek position to the second bending cheek position 10 '. The sequence is repeated until the desired sheet has been formed in the workpiece 1.
  • flat sheets and open sheet-metal profiles can be formed into structural elements with an arcuate course in the plane of the flat sheet or of a main limb of the profile, which hitherto consisted of several parts. had to be added.
  • the main leg preferably forms a main carrying belt in the structural element to be molded.
  • the method can flexibly different radii are formed, since the position of the rotation axis R in the X, Y plane relative to the workpiece 1 can be offset with little effort.
  • the axis of rotation R can still be arranged within the inner edge of the bending section 3, 4, so that only tensile stresses occur everywhere in the forming region.
  • the axis of rotation R can also run through the forming region so that a neutral fiber is obtained in the forming region or bending section 3, 4, outside of which primarily tensile stresses act during forming and, on the workpiece 1, within the primary compressive stresses.
  • the axis of rotation R can also be displaced further outwards, so that primarily only compressive stresses occur in the forming area and the workpiece 1 is compressed over a predominant part of the width or over the entire width.
  • a practically reasonable limit for the tensile stress case is the uniform elongation which is advantageously not exceeded in the fiber of the workpiece 1 subjected to the greatest stress. Buckling is critical for the compressive stress case.
  • the bending deformation is preferably carried out so that these limits are not achieved and in the case of an incremental bending deformation in any of the bending steps. In most applications, it will be beneficial if the axis of rotation intersects a line representing the turning radius in a section extending in the width direction Y from the center of the workpiece 1 to the short inner edge of the bending section 3, 4 or as in FIG extending a little way inward beyond the short inner edge.
  • the flexibility of the method is not least in the variability of the position of the axis of rotation R, so the variability of the location of the axis of rotation R both in the Y direction and transverse thereto, in the X direction, justified.
  • a change in the location of the axis of rotation R can be realized by replacing the rotary member 10 with relatively little effort to other bending methods.
  • the holding device 7, 8 must be repositioned in an adapted manner. In the geometric limits, which are predetermined by the clamping surfaces of the holding device 7, 8 and the rotary member 10, a variation can also be made by a corresponding positioning of the workpiece 1 relative to the bending tool. If the holding device 7, 8 preferably forms a lateral guide, this is adjusted accordingly.
  • bending cheeks 11 and 12 forms one of the bending cheeks 11 and 12 or form both bending cheeks 11 and 12 a side guide or on both sides of the workpiece
  • this side guide or side guides adjustable in an adapted manner.
  • Other tool parameters that can be varied are the swivel angle ⁇ and the gap length 1.
  • FIG. 3 shows the workpiece 1 lying on the lower part 7 of the holding device 7, 8 and the first bending cheek 11.
  • the pivoting movement about the axis of rotation R is indicated by a double arrow.
  • the bending cheek 11 has on its the holding device 7, 8 side facing an exemption, so that they despite the only small gap length 1 by a pivot angle ⁇ of several angular degrees, preferably at least 5 ° and preferably at most 20 °, can be pivoted.
  • the bending cheek 12 also has such an exemption.
  • the axis of rotation R in the holding device 7, 8 facing rear portion of the rotary member 10 in the embodiment exactly on the rear edge. With such an arrangement, the rotation axis R can be moved towards the inner edge of the workpiece 1 while avoiding shear stresses occurring in the forming region of the workpiece 1 towards the workpiece 1.
  • FIG. 4 shows the bending tool in a perspective view and a greater degree of detail compared with FIG.
  • the cover plate 9 is along a plurality of guide columns 20 together with the upper part 8 arranged thereon and also arranged thereon second bending beam 12 in the direction of the base plate 6 back and forth movably.
  • Shown is also a drive device 22, by means of which the rotational movement of the rotary member 10 is effected about the rotation axis R.
  • the Antriebseim ⁇ chtung 22 is formed in the embodiment as a fluidic piston / cylinder unit.
  • a cylinder of the drive means 22 is hingedly supported by a hinge member 23 on the base plate 6, and the piston is pivotally connected via a hinge member 24 with the rotary member 10 so that retraction and extension movements of the drive means 22 in the reciprocating rotational movement of the rotary member 10 are converted. It is advantageous that the drive means 22 on the tool, supported in the embodiment of the base plate 6 and therefore the power flow is closed within the tool.
  • the hinge element 23 is absolutely firmly connected to the grand plate 6, while the connection of the hinge member 24 is designed with the rotary member 10 so that the bending cheeks 11 and 12 relative to the hinge member 24 each other and are offset from each other to the Clamping engagement with the bending section 3, 4 of the workpiece 1 to produce and be able to solve. Apart from this mobility, the bending cheeks 11 and 12 are fixedly connected to the joint member 24.
  • Figure 5 shows the bending tool in the drawn in Figure 4 section A-A.
  • the first bending cheek 11 comprises a pressing plate 11a and a lower plate 11b.
  • the pressing plate I Ia forms the clamping surface of the bending beam 11 and is supported on the lower plate IIb on a sliding plate 14 from.
  • the second bending beam 12 also has a pressing plate 12 a, which forms the clamping surface of the bending beam 12.
  • the pressing plate 12a is disposed on a top plate 12b which is supported by springs 13 on another top plate 12c.
  • the top plate 12c is in sliding contact with an upper slide plate 15.
  • the slide plate 14 is fixed to the base plate 6 and the slide plate 15 is fixedly connected to the cover plate 9.
  • the division of the movable with the cover plate 9 bending beam 12 and the coupling of the two parts by means of the springs 13 provides for a homogenization of the introduced via the cover plate 9 pressing force P and in consequence also the frictional engagement and the distribution of the clamping force K in the rotary member 10 (FIG 2).
  • the conditions in the holding device 7, 8 are comparable, but it eliminates the sliding plates, since the lower part 7 fixed to the base plate 6 and the likewise split upper part 8 apart from the given also between the two structural parts of the upper part 8 spring mobility with the cover plate. 9 connected is.
  • the rotational mobility of the bending cheeks 11 and 12 is provided with joints that extend at most to the clamping surface of the bending cheek 11 or 12, which is supported by the respective articulation, the clamping surfaces So not be broken by a joint element of the joints.
  • the bending cheek 11 is connected to the base plate 6 by means of its own pivot joint with joint elements 16 and 17, and the bending cheek 12 is rotatably connected to the cover plate 9 so as to be rotationally movable by means of its own pivot joint with joint elements 18 and 19.
  • the hinge elements 11 are a pivot pin 16 supported on the base plate 6 and a rotary bushing 17 connected to the bending beam 11
  • the hinge elements 18 and 19 are a pivot pin 18 and 15 supported on the cover plate 9 a rotary beam connected to the bending beam 12
  • the press plates 1 Ia and 12a extend over the respective hinge connection 16, 17 and 18, 19 of time.
  • Figures 6 and 7 show two modified embodiments of the rotary member 10. Shown is a modified bending cheek 12.
  • the modification consists in that in the embodiment of Figures 4 and 5 simple plane pressing plate 12a is replaced by a segmented punch.
  • the segmentation is advantageous for the bending deformation of a profiled workpiece 1.
  • the profiled workpiece 1 has a wide first leg Ia and a comparatively narrower second leg Ib, which projects at right angles along the outer edge of the workpiece 1 from the first punch Ia.
  • the workpiece 1 is shown in Figure 8 in profile.
  • the second leg Ib can be laterally supported inwardly in the bending deformation and thus a reduction in the inclination due to the tensile stress occurring during the bending deformation can be prevented.
  • FIG. 6 schematically shows a plan view of a second bending beam 12 with a stamp composed of sliding segments 25a-25d.
  • the sliding segments 25a-25d are connected to each other so as to be movable relative to each other following the bending contour of the bending section 4.
  • the holding device 7, 8 next arranged punch segment 25 a is fixedly connected to the upper part 12 b, 12 c of the bending beam 12.
  • the further segments 25b-d are movably connected to the upper part 12b, 12c via the segment 25a.
  • the segments 25a-d are shown schematically as rectangles in FIG. 6, but in the real tool they are shaped adapted to the bending contour in the bending section 3, 4, so that a planar contact and lateral guidance is obtained for the second leg 1b. If the workpiece 1 is a U-shaped or double-T profile and accordingly has a further second leg at its inner edge, this also applies correspondingly to the inner sides of the segments 25a-d.
  • the second bending beam 12 has a segmented punch with punch segments 26a-f, each of which is pivotally connected to one another.
  • the holding member 7, 8 next adjacent punch segment 26a is again firmly connected to the upper part 12b, 12c of the bending beam 12, and the other punch segments 26b-f are connected via the punch segment 26a movable with the upper part 12b, 12c.

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

Abstract

L'invention concerne un procédé de flexion d'une pièce selon lequel (a) la pièce (1) est maintenue fixement au moyen d'un dispositif de maintien (7, 8); (b) la pièce est coincée par friction entre des mâchoires de flexion (11, 12) dans une section de flexion (3, 4) faisant saillie dans la direction longitudinale à partir du dispositif de maintien (7, 8); (c) la pièce est déformée par flexion par déplacement des mâchoires de flexion (11, 12) et de la section de flexion coincée (3, 4), relativement par rapport au dispositif de maintien (7, 8), par mouvement rotatif, d'une première position des mâchoires vers une deuxième; et (d) au moins la majeure partie de la force de flexion est appliquée à la section de flexion (3, 4) au moyen d'une force de friction agissant par friction.
EP09700144.0A 2008-01-03 2009-01-02 Procédé de flexion d'une pièce Not-in-force EP2231346B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810003067 DE102008003067B4 (de) 2008-01-03 2008-01-03 Verfahren und Biegewerkzeug zum Biegen eines Werkstücks
PCT/EP2009/050013 WO2009083609A2 (fr) 2008-01-03 2009-01-02 Procédé de flexion d'une pièce

Publications (2)

Publication Number Publication Date
EP2231346A2 true EP2231346A2 (fr) 2010-09-29
EP2231346B1 EP2231346B1 (fr) 2013-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09700144.0A Not-in-force EP2231346B1 (fr) 2008-01-03 2009-01-02 Procédé de flexion d'une pièce

Country Status (3)

Country Link
EP (1) EP2231346B1 (fr)
DE (1) DE102008003067B4 (fr)
WO (1) WO2009083609A2 (fr)

Families Citing this family (81)

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WO2009083609A2 (fr) 2009-07-09

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