EP0894553A2 - Apparatus for bending a hollow profile with a clamp - Google Patents

Abstract

The apparatus (1) bends a hollow profile section (2) to form an inner (or distance) frame for an insulating glass pane. It incorporates a guiding and holding unit (3), a bending tool (11), a support element (13) and a holding down unit. The holding down unit is made up of two parts (171, 172). The part (171) located in the bending region (4) is rotatable in the bending direction at least through the bending angle. The axis of rotation (18) of this part of the holding down unit is located in the neutral layer of the profile section, or it is radially offset from this layer towards the interior of the bend. The part (172) of the holding down unit is fixed and precedes the other part (171) in the feed direction.

Description

The invention relates to a device for bending a hollow profile to produce a desiccant during or after bending filled hollow spacer frame for insulating glass panes with a guide and lying approximately in the feed direction of the hollow profile Holding device for grasping the front of the bending point located profile area, with one acting as a bending tool or serving device for detecting and pivoting the bend leg of the hollow profile and with an abutment to fix the inside of the resulting bend or curve and if necessary with one on the outside of the bending point Contact pressure relative to the abutment and to the hollow profile movable and can be pressed onto the outside of the hollow profile and / or tool immersed between side webs of the hollow profile in particular in the form of at least part of the at The profile web located on the outside of the bend Pressure roller, with a support for a side bar or a Part of a side web of the hollow profile and parallel to it a hold-down for the other side bar or part of the other side web of this hollow profile are provided and the Distance between hold-down device and support approximately the width of the Hollow profile and thus the later clear distance between two Corresponding glass panes to be kept.

Such a device for bending a spacer Inner frame or spacer frame for an insulating glass pane is from DE-B-32 21 986 as part of a machine for bending known.

Such a device for bending a desiccant filled spacer frame is also from EP-B-0 121 873 and such a device for bending a desiccant filled or initially unfilled hollow profile is from EP-B-0 318 748 known and these devices have proven themselves because thus bending of hollow profiles with or without desiccant filling with a narrow bending radius is possible without the Side webs in the bending area are deformed in this way or warps receive that the glass panes to be put on it no longer in satisfactorily and with sufficient accuracy at a distance can be held and sealed.

Above all, with the known devices extruded hollow profiles with a relatively small wall thickness can be processed in a satisfactory manner, however, is one further reduction in wall thickness not possible, otherwise nevertheless an uncontrolled deformation of the side bars in the Bending area cannot be excluded. In addition, must when bending hollow profiles made of steel or stainless steel are feared that in the bending area the side webs to a Lead jamming between hold-down device and support or that Tightening and reflowing the material of the side bars around the Bending around is hindered, so the bending result above all is also unsatisfactory in the area of these side bridges.

The invention is therefore based on the object of a device to create the type mentioned, in which the advantages of previously known devices with regard to good guidance and bending especially that located on the outside of the bending point Profile web of the hollow profile as well as that on the inside existing profile web remain and the Side bars in the bending area at an exact external distance according to the distance to be maintained between two glass panes can be held even if a thin-walled extruded hollow profile for example with wall thicknesses of the order of about a tenth of a millimeter or up to about two tenths of a millimeter or a hollow profile made of steel or stainless steel is to be bent, the spacer frame despite the reduced wall thickness sufficient strength in the bending area and in particular Should have bending strength.

The solution to this seemingly contradictory task In a device of the type mentioned at the outset, that the hold-down is divided and one in the bending area part of the hold-down device at least in the bending direction is rotatable about the bending angle that the axis of rotation for this rotatable part of the hold-down approximately through the neutral fiber of the to bend hollow profile or opposite radially to the inside the bend is offset and that one in the feed direction of the hollow profile in front of this rotatable part of the hold-down device located part of the hold-down is provided fixed.

Surprisingly, it is used to fix the hollow profile hold-down devices serving during the bending are divided into one part of the part in front of the bending area and in front of the bending point Downholder is fixed, so the captured profile is practical holds stationary, while the rotatable part of the hold-down Material of the side web applied by him during the deformation through the bend and with the required and occurring Flow behavior of the material supports, but at least this Deformation and the resulting cold flow of the material not from an initially straight orientation into the curved position hindered so that a upsetting and bulging or the distance Wrinkles that enlarge the parallel side bar are avoided can be. The rotating part of the hold-down is practical on the section of the side web of the hollow profile to be bent which, in turn, is a kind of turning or Swing movement should perform a fixed or over downholder running and protruding over the entire bending area could hinder.

It is particularly useful if the axis of rotation for the rotating part of the hold-down with the swivel axis of the Bending tool matches and one with the bending movement synchronous rotary movement of the rotatable part of the hold-down device is provided. It is easy to see that in this way the Hold down the deformation of the side web captured by him one supports straight in a curved course and with the necessary transportation of the material of the side bridge contributes to support around the bending axis. Relative movements between the hold-down device and the area of the Side bars are kept as low as possible.

The support for the profile to be bent can also be used in the Bending area located rotatable part, the Axis of rotation is aligned with that of the rotatable part of the hold-down device, and the common axis of rotation of the rotatable parts of the hold-down device and the support are at right angles to the hold-down surface and the contact surface and thus at right angles to the side bars arranged of the profile. Then both side bars become practical acted upon by a rotating part and yet still kept at a distance, so that even introduction of Bending and possibly low frictional forces approximately symmetrical Way and at least largely the same size at the same time occur on both side bridges. So the danger of Squeezes and uneven bending of the parallel Sidewalls due to the largely synchronous loading moving parts as low as possible.

Through the rotatable parts of the hold-down and the support and their simultaneous twisting along with the bending movement the material of the hollow profile in the bending area of the side bars in driven and taken along in the direction in which he is Bending process should also be moved and into which it also flow should, so that it is also largely free of tension and without the gaps the side webs in the bending area adversely affecting Warps or the like is deformed. Because of this "Drive" with the help of the rotating part of the hold-down and the support forces on the bending beam can also be relative to the support be kept low because the material flows around the bend is supported by the rotatable and rotated parts.

An expedient embodiment of the invention, the tightening of material into and around the bend area also favored in the area of the side bridges, can consist in that the fixed part of the hold-down device compared to the bending hollow profile has little play or a sliding fit. On the one hand, this leads to a sufficiently good clamping of the that part of the hollow profile lying in front of the bending position holds that Hollow profile but at the same time especially in the area of Side bars not so tight that not some material in the Bending area and around this could be tightened. A Another advantage of this game occurs with desiccants filled hollow profiles, which are correspondingly strong in the bending area to be put under all-round pressure, including by the Abutment and the tool acting on the outside of the bending point, so that the desiccant experiences such an internal pressure that it stretches the profile a little in the area of the hold-down game and thus leads to a reduction in this game.

It is also expedient if the formed as a hollow profile Workpiece in the feed direction behind the bending area between Hold-down and support or in which to grasp the area to be bent Leg-serving bending tool free of play and / or clamping is held. This makes precise movement and pivoting of the leg to be bent and sliding relative to avoided the bending tool.

An important and advantageous further embodiment of the bending device of the type mentioned at the outset of its own worthy of protection Significance may be that the abutment is transverse to it Longitudinal deflection, in particular pendulum, in the way is stored that its effective area between the pad and hold-down can be moved back and forth.

This can be achieved that after the bending process and Opening the hold-down device or the entire device, the abutment can participate in ejecting the finished workpiece by it by a lifting movement opposite the support Power release curved profile releases from this support. About that there is also the possibly more important one Advantage that during the bending process with closed or in Hold-down irregularities within the profile itself or on its side bars or through a drying agent filling in the bending area caused irregularities do not lead to jamming at the abutment, because that Abutment between support and hold-down device also with one Immerse and engage in the profile to be bent or between ridges located on it automatically to such irregularities can adjust. So the abutment has a kind of "floating" bracket and is between during the bending process Support and hold-down device for the profile to be bent the best location moves, so that the inner space may become too large Tensions at this point with a jam, for example between abutment and hold down or between abutment and Bearings can be largely avoided.

Another advantage of this "floating" abutment can move between the support and the hold-down device then be exploited when facing the width of this abutment the distance between the support and hold-down is greater than two there is the webs between which the abutment engages or immersed under indentation, so that the side webs in turn opposite the hold-down to the abutment and its Hold-down side facing more space and depending on the material in the course of the bend deliberately shaped partially inward can be, but without the outer distance of the side bars in Bending area can be enlarged; so it could be this way specifically allow folds in the bending area of the side bars, without this, however, the total width of the hollow profile in the bending area enlarge and thereby render the spacer frame unusable.

For floating or moving or oscillating storage of the Abutment, which is an adjustment of its position between the support and Hold-down enables, it is favorable if the abutment on one side, especially on the side of the support or in Use position on its underside by a compression spring or the same is acted on in the sense that it is lifted Hold-down device is held spaced from the support. Especially in the case of a horizontal arrangement, said compression spring acts Gravity counteracts and raises the abutment, so that at lifted hold-down the abutment also a previously bent one Lift profile off the edition or such a lifting movement can support. If the abutment can be swiveled around an axis, it can be against the axis on the actual abutment side protrude from the opposite side and with this protrusion a stop, which limits the pendulum movement. For example the protrusion beveled, so that the pivot bearing protruding part of the abutment comes to rest when the Compression spring lifts the abutment in the bending area.

The rotatable part of the hold-down device and the abutment can connected to one another, in particular connected in one piece. This is a synchronous and even as well as simultaneous Movement of both the hold-down device and the rotatable part possible so that the inside of the bend on the one hand but also at least the inside of the side bar on the other hand during the Bend pulled from the parts acting on it to a certain extent and be carried along. Relative movements between abutment and Hold-down device that leads to corresponding constraints on the hollow profile and could lead to its bridges are avoided. However, this is also possible if the rotatable part of the hold-down device and that Abutments are not connected to each other, but these parts or they hold parts have a common drive.

The abutment can on the inner crossbar of the Hollow profile attacking abutment surface distributed transverse Grooves for the engagement of projecting on the inside of the hollow profile Have webs and the number of grooves can be chosen in particular be that several hollow profiles of different but common width can be loaded with webs projecting on the inside. The Abutment can be similar to the one that serves as an abutment Bending mandrel can be designed according to EP-B-0 582 064, at least in the area its actual abutment surface, from which the abutment to continue to mount it. It is enough if some Partial circular cross-section having abutment surface of the Abutment between the support and hold-down the mentioned spaced grooves, which is the ring grooves of the known mandrel according to EP-B-0 582 064 can correspond in terms of their function.

Thus, hollow sections of different widths, their side webs are extended via an inside crossbar with which device according to the invention can be detected and bent because the engage protruding side webs in the grooves of the abutment can, with a groove suitably aligned with the support or matches and the further grooves spaced apart in their distances from this first, which corresponds to the edition Groove are dimensioned so that profiles of different widths are detected can.

The outer wall of each can expediently be a Hollow profile with a web-engaging groove the rotatable part of the Form hold-down, that is, the spaced from the support Grooves engage with their inner wall on the inside of the Ridges, while the outer wall comes to rest on the outside and there the function of in this case in one piece with the abutment connected rotatable part of the hold-down can exercise. Consequently can have different widths of such profiles with one and the same Abutment detected and according to the invention with a rotatable part hold down and processed.

Furthermore, it may be appropriate if the abutment is detachable and is attached interchangeably. This not only allows a quick one Repair by replacing a damaged abutment, but also different sized abutments be used, which of course with a corresponding Adjustment of the distance between hold-down and Edition goes hand in hand. This can also vary in width dimensioned profiles are processed.

The fixed part of the hold-down device and its holder can the profile to be bent from the outside of the bend to be formed reach over here. This mainly results on the inside of the Bending point and the subsequent bending takes up little space, so that even angles smaller than 90 ° can be easily bent, without losing the support and storage of the fixed part of the To be hindered. The leg to be bent can so then by more than 90 °, for example by up to about 140 ° be bent what is between the two legs of the hollow profile then to a correspondingly pointed and significantly smaller Angle than 90 ° leads.

For a secure detection, especially of the leg to be bent of the hollow profile, it is advantageous if in the area of the clamping device for the supplied profile in front of the bending area Bracket is arranged, against which the hold-down in protrudes the bending area, and when the rotatable part of the Hold down on this protruding part the bending area acted upon during the bending process with the bending movement mitschwenkbaren leg that carries the bending movement of the to be bent leg of the hollow profile performing bending tool attached and in particular in the transverse direction or in the lifting direction of the hold-down device can be displaced relative to it from the profile is stored. The rotatable part of the abutment therefore settles in one leg, which also the corresponding part of the Side web of the hollow profile is detected on the leg to be bent and protects against unwanted distortions and at the exact distance to the opposite side bridge. At the same time, through this connection between the bending tool and the rotating part of the Hold-down over the pivotable hold-down leg Transfer the bending movement to the rotating part of the hold-down device and so the smooth and simultaneous movement of these parts realized.

The rotatable part of the hold-down device can thus extend in the direction of extension of the bendable leg of the hollow profile, this the Detect bending point adjacent, continue, then this Continuation forms the already mentioned hold-down leg, which has a double function, on the one hand as a hold-down and on the other hand as a coupling or transmission of the pivoting movement of the Bending tool acts on the rotatable part of the hold-down device, with which it can be connected in one piece.

It should also be mentioned that the rotatable part of the support is a radial outward sloping turntable, this waste to the outside, of course, takes place at a very small angle, so that the insertion and insertion of the workpiece or hollow profile between the support and the hold-down is as simple as possible, if the hollow profile has side webs on the inside Flange-like cross bar and on the inside of the Border cross-border a U-shaped cavity.

Overall, there is a bending device with the hollow profiles with very small wall thicknesses in the order of, for example only about 0.1 mm to about 0.2 mm or sometimes only from difficult to deform steels, the Dimensional accuracy between the side bars also precise in the bending area can be observed because the hold-down is divided and in the most deformed area of the side bars rotatable part of this hold-down is used, the Rotational movement the flow of the material around the bend supported and at least hindered as little as possible. At the same time contributes to favorable flow and deformation behavior on the side bars that in the area before the bend the profile guided and held, but not so tight that no material can be drawn from this area. Further is of great importance the floating arrangement of the abutment, which engages in the profile between the support and the holding-down device and either between webs protruding from a crossbar or by using a roughly box-shaped profile inner web adjusted to the neutral fiber and between the side bridges, partially submerging them as it is known for example from EP-B-0 318 748.

The features and measures described above will not only the necessary deformation on the crossbars, but also on the sidewalls taken into account.

Fig.1

eine Ansicht einer erfindungsgemäßen Vorrichtung zum Biegen eines Hohlprofiles, wobei sich das Hohlprofil bereits in Biegeposition befindet und sich die Führungs- und Haltevorrichtung für dieses Hohlprofil einerseits und eine als Biegewerkzeug wirkende Einrichtung zum Erfassen und Verschwenken des umzubiegenden Schenkels und ein damit zusammenwirkendes Widerlager andererseits noch in Offenstellung befinden,

Fig.2

eine der Figur 1 entsprechende Darstellung, in welcher das zu biegende Hohlprofil vor der Biegestelle von der Haltevorrichtung und hinter der Biegestelle von dem Biegewerkzeug erfaßt ist, wobei auch das beim Biegen in Biegerichtung verschwenkbare Widerlager sich in Ausgangsstellung befindet und mit einem Fortsetzungsschenkel die Innenseite des von einer Biegewange des Biegewerkzeuges an seiner Außenseite erfaßten Schenkels anliegt,

Fig.3

eine der Figur 2 entsprechende Darstellung während des Biegevorganges, nachdem das Biegewerkzeug und das Widerlager sowie ein drehbarer Teil eines Niederhalters eine Verschwenkung um etwa 45° durchgeführt haben,

Fig.4

eine der Figur 2 und 3 entsprechende Darstellung, bei welcher das Hohlprofil um 90° gebogen ist,

Fig.5

eine Stirnansicht der erfindungsgemäßen Vorrichtung mit dem Widerlager, einer Auflage für das Hohlprofil und einem außenseitig angreifenden Niederhalter, wobei gleichzeitig eine die Außenseite der Biegestelle beaufschlagende Rolle punktiert angedeutet ist,

Fig.6

einen Querschnitt der Biegevorrichtung und insbesondere des Widerlagers und der Biegewange gemäß der Schnittlinie VI-VI in Figur 5 mit einer Ansicht auf die das zu biegende Hohlprofil beaufschlagende Fläche des Niederhalters und dabei eines feststehenden Teiles des Niederhalters sowie eines schwenk- oder drehbaren Teiles dieses Niederhalters,

Fig.7

eine abgewandelte Ausführungsform der Vorrichtung zum Biegen analog der Darstellung in Figur 5, wobei sich der Niederhalter und die übrigen Teile dieser Vorrichtung in Offenstellung befinden und eine während des Biegens an der Außenseite der Biegestelle in das Hohlprofil eintauchende Rolle vorgesehen ist und wobei aufgrund der Offenstellung und der dazugehörigen Abhebung des Niederhalters das Widerlager mit seinem Fortsetzungsschenkel gegenüber der Auflage angehoben beziehungsweise von ihr etwas wegverschwenkt ist,

Fig.8

eine der Figur 7 entsprechende Darstellung zu Beginn des Biegevorganges, also eine Stirnansicht etwa der Anordnung gemäß Figur 2,

Fig.9

eine Darstellung gemäß Figur 8 am Ende des Biegevorganges, während welchem das Widerlager einerseits und die die Außenseite der Biegestelle beaufschlagende Druckrolle andererseits an der Biegestelle des Hohlprofiles in dieses eingetaucht sind,

Fig.10

eine den Figuren 7 bis 9 entsprechende Darstellung, wobei die Vorrichtung nach dem Biegevorgang wieder geöffnet ist und das Widerlager sich mit dem Profil von der Auflage abgehoben hat,

Fig.11

eine Ansicht einer abgewandelten Vorrichtung zum Biegen, bei welcher der drehbare Teil des Niederhalters mit dem Widerlager dadurch einstückig verbunden ist, daß das Widerlager quer zu seiner Widerlager verlaufende Nuten hat, wobei die jeweils vom Profil abgewandte Wandung einer solchen Nut als drehbarer Teil des Niederhalters wirkt,

Fig.12

eine der Darstellung der Figur 7 entsprechende Stirnansicht der abgewandelten Vorrichtung zum Biegen gemäß Figur 11 mit Blick auf das Widerlager und auf die dort vorgesehenen Nuten auch zur Anpassung an unterschiedlich breite Hohlprofile, wobei die Außenseite der Biegestelle durch eine Druckrolle beaufschlagbar ist, deren Breite größer als die des Hohlprofiles ist,

Fig.13

eine der Figur 12 entsprechende Darstellung bei geschlossener Vorrichtung zu Beginn des Biegevorganges,

Fig.14

eine den Figuren 12 und 13 entsprechende Darstellung der Vorrichtung analog Figur 9 am Ende des Biegevorganges,

Fig.15

eine Ansicht gemäß den Figuren 12 bis 14 und analog Figur 10 am Ende des Biegevorganges nach dem Öffnen der Vorrichtung,

Fig.16

in vergrößertem Maßstab eine den Figuren 5 und 7 bis 10 sowie 12 bis 15 entsprechende Ansicht einer abgewandelten Ausführungsform, bei welcher die Abmessung des Widerlagers gegenüber der Innenseite des Hohlprofiles beziehungsweise dort innenseitig überstehender Schenkel eine geringere Breite hat und in Ausgangsstellung ein definiertes Spiel freiläßt, welches durch die Umformung gefüllt wird, sowie

Fig.17

eine der Figur 16 entsprechende Darstellung während und nach dem Biegevorgang, nach welchem das Spiel zwischen Widerlager und Hohlprofil auch an den Oberflächen des Widerlagers durch Umformung des Hohlprofiles oder seiner abstehenden Schenkel ausgefüllt ist.

Exemplary embodiments of the invention are described in more detail below with reference to the drawing. It shows in a partially schematic representation:

Fig. 1

a view of an inventive device for bending a hollow profile, the hollow profile is already in the bending position and the guide and holding device for this hollow profile on the one hand and a device acting as a bending tool for detecting and pivoting the leg to be bent and a cooperating abutment on the other hand in Open position,

Fig. 2

a representation corresponding to Figure 1, in which the hollow profile to be bent in front of the bending point is detected by the holding device and behind the bending point by the bending tool, the abutment which is pivotable when bending in the bending direction being in the starting position and with a continuation leg the inside of a bending cheek of the bending tool rests on the outside of the leg,

Fig. 3

2 shows a representation corresponding to FIG. 2 during the bending process, after the bending tool and the abutment and a rotatable part of a hold-down device have pivoted about 45 °,

Fig. 4

3 shows a representation corresponding to FIGS. 2 and 3, in which the hollow profile is bent through 90 °,

Fig. 5

3 shows an end view of the device according to the invention with the abutment, a support for the hollow profile and a hold-down device acting on the outside, wherein at the same time a roller acting on the outside of the bending point is indicated by dotted lines,

Fig. 6

5 shows a cross-section of the bending device and in particular of the abutment and the bending cheek according to the section line VI-VI in FIG. 5 with a view of the surface of the hold-down device which acts on the hollow profile to be bent and thereby a fixed part of the hold-down device and a pivotable or rotatable part of this hold-down device,

Fig. 7

a modified embodiment of the device for bending analogous to the illustration in Figure 5, wherein the hold-down and the other parts of this device are in the open position and a roller is immersed in the hollow profile during the bending on the outside of the bending point and wherein due to the open position and the associated lifting of the hold-down device, the abutment with its extension leg is raised relative to the support or is pivoted somewhat away from it,

Fig. 8

7 shows a representation corresponding to FIG. 7 at the beginning of the bending process, that is to say an end view of the arrangement according to FIG. 2,

Fig. 9

8 at the end of the bending process, during which the abutment on the one hand and the pressure roller acting on the outside of the bending point on the other hand are immersed in this at the bending point of the hollow profile,

Fig. 10

7 shows a representation corresponding to FIGS. 7 to 9, the device being opened again after the bending process and the abutment with the profile being lifted off the support,

Fig. 11

a view of a modified device for bending, in which the rotatable part of the hold-down is integrally connected to the abutment by the fact that the abutment has grooves extending transversely to its abutment, the wall of such a groove facing away from the profile acting as a rotatable part of the hold-down ,

Fig. 12

a front view corresponding to the representation of Figure 7 of the modified device for bending according to Figure 11 with a view of the abutment and the grooves provided there also for adaptation to different widths of hollow profiles, the outside of the bending point can be acted upon by a pressure roller whose width is greater than that of the hollow profile,

Fig. 13

12 shows a representation corresponding to FIG. 12 with the device closed at the beginning of the bending process,

Fig. 14

12 shows a representation of the device corresponding to FIGS. 12 and 13 analogously to FIG. 9 at the end of the bending process,

Fig. 15

12 shows a view according to FIGS. 12 to 14 and analogously to FIG. 10 at the end of the bending process after opening the device,

Fig. 16

5 and 7 to 10 and 12 to 15 corresponding view of a modified embodiment, in which the dimension of the abutment has a smaller width compared to the inside of the hollow profile or the inside projecting leg there on a larger scale and in the starting position leaves a defined play, which leaves open is filled by the forming, as well

Fig. 17

a representation corresponding to Figure 16 during and after the bending process, after which the play between the abutment and the hollow profile is also filled on the surfaces of the abutment by reshaping the hollow profile or its protruding legs.

In the different exemplary embodiments described below receive identical parts in their function matching reference numbers, even if they differ from each other are designed.

A device designated as 1 for bending one Hollow profile 2, which for example for the production of a hollow Spacer frame for insulating glass panes should serve in The following also called "bending device 1" for short, has one lying and arranged in the feed direction of the hollow profile 2 Guide and holding device 3, with which in front of the bending point 4 located profile area 5 can be detected and according to figure 2 is detected. The feed direction of the profile is in figure 1 indicated by the arrow Pf1.

Different or possible cross-sectional shapes of the hollow profile 2 can be seen, for example, in FIG. 7, FIG. 12 and FIG. 16. Figure 7 shows an approximately box-shaped cross section, at which two parallel side webs 6 and two approximately at right angles to it extending parallel crossbars 7 and 8 are provided, the 4 internal crossbars in the bending area and at the bending point 7 connects the side webs 6 directly at right angles, while the outside cross bar with the side bars over oblique Transitions 9 is connected.

In the hollow profiles according to Figure 12 or 16, the side webs 6 seen in cross-section over the inside transverse web 7 protruding flanges 10, so that the inside crosspiece 7 of the neutral fiber of the hollow profile 2 is closer or even in the neutral fiber can be arranged. The flanges 10 are located in the bending area 4 on the inside of the bend and its cross section is directed towards the inside of the bend.

The individual parts of the bending device are on this hollow profile 2 1 appropriately adapted to fix it and bend it can. It can be seen above all in FIGS. 2 to 6 and further in FIG. 11, designated as a whole by 11, as Bending tool acting or serving device for detecting and Pivoting the leg 12 of the hollow profile 2 to be bent, therefore also called "bending tool 11" below. Heard further to the bending device 1, an abutment 13, which from the EP 0 318 478 B1 known abutment in terms of shape and Mode of action is similar. The abutment 13 has its actual abutment surface starting from a continuation leg 14, which can be seen when bending in the direction of FIG curved arrow Pf2 along with the swiveling-bending movement. With the abutment 13, the inside of the emerging Fixed bend or curvature, the one directly loaded Cross bar 7, if necessary, in the bending area towards the neutral Fiber can be moved and deformed, as shown in Figure 9 is indicated when the abutment 13 namely during the Bending movement simultaneously at the bending point 4 in the hollow profile 2 immersed between the side webs 6.

In the exemplary embodiments, there is also one on the outside the bending point 4 under contact pressure relative to the abutment 13 and movable to the hollow profile 2 and on the outside and the external crossbar 8 of the hollow profile 3 can be pressed (FIG 5 and Figures 12 to 15) or immersed between the side webs 6 Tool provided in the form of a pressure roller 15, which is from EP 0 121 873 B1 and from EP 0 318 748 B1 each in terms of shape, working and Mode of action is known.

As also from the publications already mentioned several times is known, is also a device 16 for a device 1 Side bar 6 or a portion of the side bar 6 of the Hollow profile 2 and parallel to it a total designated 17 Hold-down for the parallel other side bridge 6 or one Part of this other side web 6 of the hollow profile 2 is provided, the distance between holding-down device 17 and support 16 during of the bending process, for example according to FIG. 5 or 16, approximately Width of the hollow profile 2 and thus the subsequent clear distance two glass panes of the insulating glass pane to be kept at a distance corresponds.

For example from FIG. 8 or 16 or also from FIG. 13 clearly that in this way the hollow profile 2 at least on the Bending point 4 at the beginning and as far as possible during the bending movement embraced and enclosed on all sides, so that dimensional deviations by uncontrolled deformations, especially on the side bars 6 be avoided, which later the contact surfaces for the glass panes form and there should result in a smooth, well-sealed surface, under certain circumstances even before making the bend Sections of these side webs 6 covered with a sealant could be.

The bending process is thus on the inner crosspiece 7 supports that the abutment 13 and its continuation leg 14 also pivoted in synchronism with the bending movement according to arrow Pf2 become. Furthermore, the bending process on the outer crossbar 8 supported in the exemplary embodiments by a pressure roller 15, either this outer cross bar 8 with its width surpasses and has a rolling and stretching effect (Figure 5 and Figures 12 to 15) or those due to their lower Dimension can dip between the side webs 6 (Figure 7 to 10 and FIGS. 16 and 17, as known from EP 0 318 748 B1).

In addition, the bending movement and the necessary material deformation of the material of the Hollow profile 2 supported in that - as for example in Figure 6 clearly recognizable - the hold-down device 17 is divided and one in the bending area 4 part 171 of the hold-down, in hereinafter also called rotatable hold-down part 171, in Bending direction is rotatable at least about the bending angle, wherein the pivot or rotation axis 18 for this rotatable part 171 of the Hold-down approximately through the neutral fiber to be bent Hollow profile 3 or this opposite radially to the inside of the bend is arranged offset, as the embodiments show.

Since the hold-down device 17 is divided, there is also an in Feed direction of the hollow profile 2 in front of this rotatable part 171 and part 172 of the holding-down device located in front of the bending point 4 17, which is stationary and which is stationary during the bending process held part of the hollow profile 2 and the bending point 4 immediately adjacent.

Through this swiveling or rotating movement of the rotatable hold-down part 171 and participation in the holding of the hollow profile 2 on the holding device 3 is the deformation and movement as well the required material flow of the material of the hollow profile 2 also taken into account as best as possible on the side bridge 6, i.e. Deformation and movement not only on the inside crossbar 7 and supported on the outer crosspiece 8, but the crossbar 6 is also suitable in terms of its Deformation "around the corner" by the part 171 of the Hold down 17 carried and in the desired direction redirected.

In the exemplary embodiment, the axis of rotation 18 is correct for the rotating part 171 of the hold-down with the pivot axis of the Bending tool 11, which is why the axis of rotation 18 and this Pivot axis are provided with the common reference number 18. Here is synchronous with the bending movement according to arrow Pf2 Rotational movement of the rotatable part 171 of the hold-down device is provided.

The support 16 for the hollow profile 2 to be bent also has Bending area 4 on a rotatable part 161, the axis of rotation again with that of the rotating part 171 of the hold-down device 17 is aligned or coincides, this axis of rotation 18 of the with rotatable parts 161 and 171 perpendicular to the hold-down surface and the contact surface and thus at right angles to the side bars 6 of the hollow profile 2 is arranged. You can see this, for example clearly in FIGS. 8 and 9, 13 and 14 and 16 and 17.

Since the material of the hollow profile 2 and also that of Side bars 6 during the bending process somewhat around the "bend" has to be moved around and pulled around, so some material too can flow from the hollow profile area in front of the bending point 4 is, the fixed part 172 of the hold-down 17 opposite the hollow profile 2 to be bent a slight play or one Sliding seat, that is, its distance from the pad 18 can slightly larger than the corresponding dimension of the hollow profile 2, but it is a hardly noticeable game in Range of hundredths and tenths of a millimeter. Thereby the hollow profile 2 is sufficient from the holding device 3 fixed and still allows the desired slight Afterflow from immediately before the bending point 4 Material in the bending area. Furthermore, the holding device 3 still an open according to Figure 1, according to Figure 2 to the outer crossbar 8 press-on holding jaw 19, one good definition of the hollow profile 2 in spite of the game mentioned Area of the fixed part 172 of the hold-down device 17 allows.

The workpiece designed as a hollow profile 2 is in the feed direction behind the bending area 4 between hold-down device 17 and support 18 and in that serving to grasp the leg 12 to be bent Bending tool 11 kept free of play and / or clamping so that its Dimension is not distorted by the bending process. Doing so in this area the part 171 which can also be pivoted or rotated of the hold-down device 17 and the rotatable part 161 of the support 16 effective. The hollow profile 2 is therefore at and behind the bending point 4 firmly and securely on all sides, so that its cross section and in particular the distance between the outer sides of the side webs 6 during and remain after the bend.

An essential feature of the device 1 in its different Embodiments can be seen in Figures 7 and 10 on the one hand and 12 and 15 on the other. The peculiarity exists thereby in that in the figures mentioned still in descriptively differently designed abutments 13 across to its longitudinal extent and to the longitudinal extent of its Continuation leg 14 deflectable and swinging in the way is stored that its effective range, that is the part of the abutment 13, the inner crosspiece 7 during the bending movement acted upon and possibly also something inside the Hollow profile 2 deformed into it, between pad 16 and hold-down 17 or rotatable part 171 of the hold-down device back and forth is movable. The above figures show the largest deflection in each case with open or unused Bending device 1, in which the hold-down device 17 is still from its Position of use is removed and lifted. This biggest Deflection movement is by the delivery of the hold-down in his in Figures 8 and 9, 13 and 14 and 16 and 17 and also in Figure 5 position partially reversed, but remains a certain automatic adaptability to dimensional inaccuracies or slight material fluctuations of the hollow profile 2 and its Get side webs 6 or its flanges 10.

The abutment 13 is automatically adjusted and centered thereby by the aforementioned pendulum movement about a transverse axis 20, the extension leg 14 at a distance from the actual Abutment 13 in the transverse direction and also at right angles to the Axis of rotation 18 passes through.

Figures 10 and 15 illustrate a further advantage this oscillating arrangement of the abutment 13. After the bending process namely supports this pendulum movement in the deflected position also the lifting of the curved hollow profile 2 from the support 16, so that despite its deformation and an accompanying Squeeze also relatively easily removed from the bending device 1 can be. The oscillating arrangement of the abutment 13 supports thus also the ejection of the curved hollow profile 2. Thus this measure has a double function, because on the one hand it has a automatic adjustment to any minor irregularities the hollow profile 2 already during delivery and during Bending process allowed and on the other hand the removal of the bent Workpiece from the bending device 1 facilitated.

In the exemplary embodiment it is provided that the abutment 13 one side, in this case on the side of the support 16, by a compression spring 21, in this case by one with the compression spring 21 cooperating pin in the sense that it is when the hold-down device 17 or hold-down part 171 is lifted off Bearing 16 is held at a distance, as is shown in FIGS. 7 and 12 demonstrate. The compression spring 21 pivots the abutment 13 the transverse axis 20 in the deflected pendulum position. Here is this Deflection limited by the fact that on the transverse axis 20th protruding part of the extension leg 14 on the support 16 or a sequel to it, and another Prevents pivoting. The abutment 13 and in particular Extension leg 14 is thus designed as a seesaw. The alignment the abutment 13 in the working position is done by adjusting of the hold-down device 17 or 171 in the use position according to FIG. 8 or 13 or 16 against the force of the spring 21, which after the Bending process and then after lifting the hold-down 17 according to Figure 10 and 15 is effective again and when loosening the bent Hollow profile 2 helps from the bending device 1.

FIGS. 16 and 17 also show a modification in connection with the Bending a hollow profile 2, in which the internal crosspiece 7 is exceeded by the side webs 6 extending flanges 10. In this case, according to FIG. 16, this is between the inner sides Flanges 10 and the abutment 13 each have a defined game present, which is filled in by the deformation according to FIG. 17 can be. The rotatable part 171 of the Hold-down and the rotatable part 161 of the edition accordingly with and prevent a dimensional deviation of the side webs 6 and Flanges 10 outwards, but possibly due to the bend necessary deformations especially of the flanges 10 in the already find space mentioned above.

It can be seen that on the holding-down device 17 facing Surface of the abutment 13 or its continuation leg 14 a spacer 22, advantageously in one piece with the Abutment 13, can be provided to make room for the leg or to leave flange 10. Such a spacer 22 can, however, also in the exemplary embodiment according to FIGS 10 may be provided, especially when the abutment 13 and if necessary, the pressure roller 15 at the bending point 4 in the Immerse the hollow profile 2. Accordingly, is also in Figures 7 and 10 such abutment 22 indicated.

In the exemplary embodiments according to FIGS. 1 to 10 and 16 and 17 is the rotatable part 171 of the hold-down 17 from the abutment 13 independently and can be relative to the abutment 13 in the direction the axis of rotation 18 can be lifted.

In contrast, in the exemplary embodiment according to FIGS. 11 to 15 a modification in that this rotatable part 171 of the hold-down device 17 and the abutment 13 are connected to one another are in one piece in this embodiment. this has the advantage that the synchronous movement of the abutment 13 and rotatable or pivotable part 171 automatically and automatically he follows. In addition, an embodiment of the device 1 possible, which is also realized in this embodiment and is that the abutment 13 over its abutment surface distributes transverse grooves 23 for on the hollow profile 2 inside protruding flanges 10 or folds of the side webs 6 and that the number of grooves 23 is chosen such that several differently dimensioned hollow profiles 2 with inside already or only after the projecting webs 6 or Flanges 10 can be acted upon. In Figures 12 to 15 is included a hollow profile 2 with from the outset opposite the inside Cross bar 7 projecting flanges 10 medium size shown. It can be seen that even narrower hollow sections 2 or one wider hollow profile 2 could be processed.

The outer wall 24 each has a hollow profile 2 with a web 6 or a flange 10 engaging groove 23 forms the rotatable Part of the hold-down device 17, which is clear in the figures mentioned is, because such an outer wall 24 engages in the use position at least a portion of a flange 10 Side bridge and also synchronously follows the bending movement and the process performed pivoting of the abutment 13 and his Continuation leg 14 about the axis of rotation 18. In addition, before the Bending point 4 according to FIG. 11 is a fixed part 172 of the Hold-down device 17 is provided.

Of course, however, an abutment 13 could only be used a groove can be provided, in which case the outer wall 24 of this groove the one-piece rotatable part 171 of the hold-down 17 for form a predetermined dimension of the hollow profile cross section would.

At this point it should be mentioned that the abutment 13 is detachable and can be attached interchangeably. Because the hold-down 17 or a other closure is adjustable in the direction of the axis of rotation 18, can also adapt to different in this way dimensioned cross sections of hollow sections 2 are carried out. It can even optionally an abutment according to Figures 1 to 10 or 11 to 15 are used.

So on the inside of the bending point 4 and in the swivel range of the abutment 13 and its extension leg 14, that is Inside the bend, enough space for an overbend or for the pivoting of the bending tool 11 by more than 90 °, For example, up to about 140 °, remains free, the fixed overlaps Part 172 of the hold-down device 17 and its holder 25 to be bent Hollow profile 2 from the outside of the bend to be formed, such as you can clearly see it in Figures 1 to 4 and 11. So can the mechanism for lifting the hold-down device 17 is also good can be accommodated, of which one can be seen in the figures 1 recognizes up to 4 guide rods 26.

In the area of the clamping and holding device 3 for the supplied Hollow profile 2 in front of the bending area or the bending point 4 is there the bracket 25 already arranged on the outside, opposite which of the hold-down 17 in the actual bending area protrudes. The rotatable part 171 of the hold-down device 17 carries a directly acting on the bending area 4 during the Bending process with the bending movement with swiveling hold-down legs 173, the bending movement of the one to be bent Leg 12 of the hollow profile 2 performing bending tool 11 is fastened, that is, according to FIG. 3, is also carried in Transverse direction to this - perpendicular to the plane of the drawing 1 to 4 - but is slidably supported by the aforementioned lifting movement to allow. You can see this coupling or connection point 27 in the top views of the devices 1. Accordingly, that Bending tool 11 has a recess 28 into which a projection 29 of the hold-down leg 173 engages. In clutch area 27 is also a parallel to the axis of rotation and bending 18 and Guide rods 26 arranged guide pin 30 to recognize the the lifting movement already mentioned vertical to the drawing plane of the Figures 1 to 4 and supported relative to the bending tool 11.

The rotatable part 171 of the hold-down device 17 thus sets in Direction of extension of the bendable leg 12 of the hollow profile 2, grasping this adjacent to the bending point 4, through this Hold-down leg 173 continues. The side webs 6 respectively Flanges 10 are thus both directly at the bending point 10 as well as in the feed direction according to arrow Pf1 and held down synchronously with the bending progress.

It should also be mentioned that the rotatable part 161 of the support 16 is a radially sloping turntable can be what the insertion and inserting the hollow profile 2 between hold-down device 17 and Edition 16 can facilitate.

Overall, there is a device 1, in which during the Bending process also on the pressurized by the hold-down device 17 Side web 6 and / or flange 10 of the material of the hollow profile 2 supports with regard to its flow behavior and in any case is not disturbed, so that an unwanted emergence and a Forming that impairs the outer dimensions and the sealability is also avoided on this side surface of the profile 2. The entire bending process is harmonized and not only on the Cross bars 7 and 8, but also the side bars 10 through appropriate movements with the help of the rotating part 171 of the hold-down device 17 supports. The rotary movement of the rotatable Hold-down part 171 takes place in the exemplary embodiments by the swivel drive for the bending tool 11 and / or for the Hold-down 13, so that a synchronous movement to the whole Bending process takes place.

The device 1 is used to bend a hollow profile 2 with which a spacer frame for insulating glass panes can be manufactured should. The hollow profile 2 can already be used during the bending Desiccant filled or still empty. The bending device has in addition to a bending tool 11 and an abutment 13 a hold-down device 17 for loading a side web 13 and / or a flange continuing its cross-section on the inside 10 and a support 16 parallel to it, so that it can also be used in the bending area 4 the outer dimension of the hollow profile 2 is precisely preserved.

To thereby the bending movement and the deformation as well as the flow of the Material of the hollow profile 2 and its side webs 6 / flanges To support 10, the hold-down 17 is divided and has in Bending area 4 one with the bending movement in the bending direction with rotatable part 171, which changes the direction of the Side web 6 / flange 10 supported in the bending process.

Claims (16)

Device (1) for bending a hollow profile (2) for producing a hollow spacer frame for insulating glass panes filled with drying agent during or after bending, with a guide and holding device (3) lying approximately in the feed direction of the hollow profile (2) for detecting the front the bending point (4) located profile area (5), with a device acting or serving as a bending tool (11) for detecting and pivoting the leg to be bent (12) of the hollow profile (2) and with an abutment (13) for fixing the inside of the resulting Bending or curvature and optionally with a pressure that can be moved on the outside of the bending point (4) under contact pressure relative to the abutment (13) and to the hollow profile (2) and can be pressed on the outside of the hollow profile (2) and / or between side webs (6) of the hollow profile immersing tool, in particular in the form of at least part of the profile located on the outside of the bend or cross bar (8) acting on the pressure roller (15), a support (16) for a side bar (6) or a portion of a side bar (6) of the hollow profile (2) and parallel to this a hold-down device (17) for the other side bar (6 ) or part of the other side web (6) of this hollow profile (2) are provided and the distance between the hold-down device (17) and the support (16) is approximately the width of the hollow profile (2) and thus the subsequent clear distance between two glass panes to be kept at a distance characterized in that the hold-down device (17) is subdivided and a part (171) of the hold-down device located in the bending area (4) can be rotated in the bending direction at least approximately by the bending angle such that the axis of rotation (18) for this rotatable part (171) of the hold-down device is arranged offset, for example, by the neutral fiber of the hollow profile (3) to be bent or this is radially offset from the inside of the bend, and in that in the feed direction of the hollow profile ( 2) in front of this rotatable part (171) of the hold-down part (172) of the hold-down is provided in a fixed manner. Apparatus according to claim 1, characterized in that the Rotation axis (18) for the rotating part (171) of the hold-down device coincides with the swivel axis of the bending tool (11) and a rotational movement synchronous with the bending movement of the rotatable part (171) of the hold-down device is provided. Device according to claim 1 or 2, characterized in that that the support (16) for the hollow profile (2) to be bent rotating part (161) located in the bending area (4) has whose axis of rotation with that of the rotatable part (171) of the hold-down device (17) is aligned, and that the common Rotation axis (18) of the rotatable parts of the hold-down device and the support perpendicular to the hold-down surface and the Contact surface and thus at right angles to the side bars (6) of the hollow profile (2) is arranged. Device according to one of claims 1 to 3, characterized characterized in that the fixed part (172) of the hold-down device (170) compared to the hollow profile to be bent (2) has little play or a sliding fit. Device according to one of claims 1 to 4, characterized characterized in that the hollow profile (2) Workpiece in the feed direction behind the bending area (4) between hold-down device (17) and support (16) respectively in the serving to grasp the leg (12) to be bent Bending tool (11) is kept free of play and / or clamped. Device according to the preamble of claim 1 or in particular according to one of claims 1 to 5, characterized in that the abutment (13) can be deflected transversely to a longitudinal extent, especially swinging, is mounted in such a way that be Effective area between the support (16) and the hold-down device (17) is movable. Device according to one of claims 1 to 6, characterized characterized in that the abutment (13) on one side, in particular on the side of the support (16), by a Compression spring (21) or the like acted upon in the sense is that when the hold-down device (17) is lifted off the support (16) is kept spaced. Device according to one of claims 1 to 7, characterized characterized in that the rotatable part (171) of the hold-down device (17) and the abutment (13) connected to each other, in particular are connected in one piece. Device according to one of claims 1 to 8, characterized characterized in that the abutment (13) over its abutment surface distributes transverse grooves (23) for on the Hollow profile (2) on the inside protruding webs (6) or flanges (10) and that the number of grooves (23) in particular is chosen that several hollow profiles (2) different Width can be applied with webs (6; 10) projecting on the inside are. Device according to claim 8 or 9, characterized in that that each have a hollow profile (2) with the outer wall (24) a web (6) or a flange (10) engaging groove (23) forms the rotatable part of the hold-down device (17). Device according to one of claims 1 to 10, characterized characterized in that the abutment (13) is detachable and replaceable is attached. Device according to one of claims 1 to 11, characterized characterized in that the fixed part (172) of the hold-down device (17) and its holder the hollow profile to be bent (2) engages from the outside of the bend to be formed. Device according to one of claims 1 to 12, characterized characterized in that in the area of the holding device (3) for the supplied hollow profile (2) in front of the bending area (4) Bracket (25) is arranged, opposite which the hold-down (17) protrudes into the bending area and that the rotatable Part (171) of the hold-down on this protruding part directly impacting the bending area (4) while of the bending process with the bending movement Hold-down leg (173) carries the bending movement on one of the leg (12) of the hollow profile (2) to be bent performing bending tool (11) attached, and in particular is slidably mounted in the transverse direction. Device according to one of claims 1 to 13, characterized characterized in that the rotatable part (171) of the hold-down device (17) in the direction of extension of the bendable leg (12) of the hollow profile (2), this of the bending point (4) grasping neighboring, continues. Device according to one of the preceding claims, characterized characterized in that the rotatable part (161) of the support (16) is a turntable sloping radially outwards. Device according to one of the preceding claims, characterized characterized in that on the holding-down device (17) facing Surface of the abutment (13), a spacer (22), in particular in one piece with the abutment (13) is.

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