EP1591174A1 - Bending device for bar or tube-shaped workpieces - Google Patents

Abstract

The machine has a bending head (2) with a bending mandrel (7) that is mounted on a rotational axis and rotatable by a rotary drive. A clamping device (3) presses a workpiece to be bent against a forming groove on the bending mandrel. The clamping device has a tensioning block (18) that is attached to a holding unit (20) that carries the workpiece. The holding unit is attached to a drive device on a carrier piece.

Description

The invention relates to a bending device for rod and tubular workpieces, wherein the bending device comprises a bending head with a mounted on a rotation axis, by means of a rotary drive rotatable mandrel and with a clamping device for Pressing of the workpiece to be bent against a forming groove on the mandrel comprises, wherein the Bending head further comprises a feed device for the workpiece to be machined and the Clamping device movable relative to the mandrel and 'concentric with the axis of rotation of the Bending mandrel is pivotable.

Such bending devices are used in modern bending machines for rod-like workpieces and used for prefabricated cables with mainly larger cross sections.

In this case, the bending device is composed of several units, which especially in tubular workpieces with thin wall thicknesses by their interaction a good Allow bending result.

A bending device should ideally meet a number of specific requirements be able to perform the following functions: Left and Right bending, pull and roll bending, winding, a bend without intermediate straight Create piece directly after another bend, make different bending radii, bend different pipe diameters, prevent wrinkles, bend in three dimensions and allow easy conversion.

Bending devices with bending heads are known which are suitable for changing over from left to right Legal winds z. B. must be rotated (see, EP 1 226 887 B1, EP 1 291 094 B1 and EP 1 350 578 A1) or which are constructed symmetrically (WO 03/053 606 A1). Likewise is too the possibility of changing a bending head for such a change known.

Also state of the art is the use of multi-stage tools for generating different bending radii and for machining different workpiece diameters, as well as the use of mold jaws for making successive bends without intermediate straight piece (see EP 1 350 578 A1 and WO 03/053 606 A1). Also the Use of a slide rail for supporting and tracking the material is known (see EP 1 291,094, EP 0 963 800 B1 and US 6,651,475).

WO 2004/000479 A1 describes a bending device of the type mentioned, which can be used for both left and right bending, without causing the Bending mandrel would have to be replaced. This is formed substantially circular and with two axially mutually offset from him, circular shape grooves one of which is used for left-hand bending and the other for right-hand bending. However, at each of the forming grooves, at the point where the pipe bend is bent Pipe with its free end again tangentially from the annular groove, a corresponding Attached molding, which in turn has a rectilinear form-groove portion, the tangent of the corresponding mold groove goes off, so that a straight tangential of the bend running tail of the pipe to be bent in this Formnutabschnitt lies. For bending, the delivered by a feeder tube by means of a Clamping device, which is movable relative to the mandrel, against the corresponding, of the concerned form groove tangential expiring Formnutabschnitt of the fitting created and pressed, after which the clamping device with clamped pipe together with the Bending mandrel is pivoted concentrically to the axis of rotation of the latter until behind the rectilinear Formnutabschnitt in the subsequent annular groove in the Twist the tube is bent accordingly. Thereafter, the clamping device of Bending mandrel trailed and the bent tube in its bent portion from the forming groove of the bending mandrel and in its rectilinearly expiring end portion of the Formnutabschnitt taken out of the fitting.

Should then z. B. the same tube still receive a bend in the other direction, the For example, to connect directly to the first bend, the already bent pipe section on the other side of the bending mandrel and there on the altitude of the other Formnut am Bending mandrel spent. At the same time the clamping device is about the axis of rotation of the bending mandrel and so far pivoted around it that it is placed on the other side and between her and the bending mandrel there again the pipe is present. After that, the tube becomes again between clamping device and bending mandrel (there again in one on the other Formnut appropriately attached fitting with a rectilinear, tangential from the forming groove of the bending mandrel outgoing Formnutabschnitt) braced and then by a common rotation of the clamping device and mandrel around the Rotational axis of the mandrel, this time in the opposite direction of rotation, the new bend on Tube generated.

As for the left and the right bending on the mandrel two axially staggered Forming grooves are provided, which in each case still a fitting with the rectilinear is associated with extending Formnutabschnitt, and da (due to the different Bending direction), the two fittings, albeit at different altitudes, in each other opposite direction to project straight from the mandrel, must accordingly the Clamping device, as they are in their Verschwenkstellungen for the two bending directions respectively with one of the mold grooves and the associated mold section in different Altitudes must also work together, also according to the different level arranged molding grooves for pressing the tube against the mandrel and its Have mold sections. This requires geometrically that the corresponding form of grooves also, as well as the fittings on the mandrel, must be next to each other, what to a complicated structure and leads to a relatively large width of the clamping device, but in view of the desired in such bending devices compact design unfavorable is. The same applies to the wrinkle smoother used there in the form of longer, the Clamping device, seen in the feed direction of the tube, each directly upstream Guide rails with a corresponding Formnut for conditioning the wire. Again, you have to because of the different altitude of the forming grooves on the mandrel in terms of Left and right bending two different smoothing bars are used, which in pointing opposite direction, form there each a form of groove and also to correspondingly large travels must be moved next to the sliding pin. Also This is undesirable space consuming. The pamphlet is also silent about how the Relative movement of the clamping device relative to the mandrel is realized, wherein However, the figure representations of the document recognizable a move along a the underside of the clamping device attached and overlapped by this form-fitting Guideline is made, which is obviously there but not more described linear actuator must be used.

Proceeding from this, the invention is based on the object, such a bending device to improve such that the clamping device with a particularly small footprint gets along and for the linear movement of the clamping device no separate linear adjustment motor is required.

According to the invention this is in a bending device of the type mentioned by achieved that the clamping device to two independent rotary actuators is connected, one of them to perform their pivoting movement about the axis of rotation the bending mandrel serves and over the other them with the interposition of a Implementation gear that converts a rotary motion in a linear motion, opposite the mandrel is movable, wherein the mandrel to transfer the drive of the three Rotary drives to the bending mandrel, to the transfer gear and the clamping device three comprises concentrically nested rotary shafts, each of which is connected to one of the rotary drives connected.

Preferably, the innermost rotary shaft is arranged at the very top of the bending head Bending mandrel, while, again preferred, the central rotating shaft that at the bending head below the Bending mandrel mounted transfer gear for generating the linear movement for the Clamping device drives, wherein preferably the outer rotary shaft with a below the transfer gear arranged holding plate is rotatably connected, on which the Clamping device is slidably mounted in one direction to the bending mandrel.

In the bending device according to the invention is characterized in that also the linear Adjusting movement of the clamping device of a rotary drive (with the interposition of a Transfer gear) is derived, the possibility created, the three rotary actuators over three concentric with each other to transmit rotary shafts to the desired parts and thereby achieving a particularly compact overall design for the bending head, wherein the Integration of such a transfer gear in the overall structure of the three intertwined Shafts in the context of the bending head can be easily realized. The need for Using a separate, extra outside to be arranged linear drive is avoided. The control of the motors for the three rotary actuators z. B. via a program control made, with just the implementation of a rotational movement over the Transfer gear in the linear movement of the clamping device relative to the mandrel particularly quickly and can be made exactly. The setting is a desired one Pressing force with which the clamping device the wire against the forming groove in the mandrel presses, problem-free possible.

As a conversion gear any suitable structural design can be provided for this purpose. However, particularly preferably, the transfer gear comprises a grooved disc with a in this trained, eccentric to its axis of rotation groove into which a at the Clamping device fixed, the cross-sectional shape of the groove corresponding shaped body engages, which is displaceable in the groove and its distance from the axis of rotation of the Nutenscheibe is variable by a rotation of the Nutenscheibe. This can be done as part of a Art Slotted guide by the rotational movement of the grooved disc quickly a corresponding linear Adjusting movement of the clamping device can be effected, the drive not only very is ptatzsparend, but the adjustment movements are also carried out very quickly can.

In this case, the clamping device preferably has a non-rotatable on the Nutenscheibe with this fastened mounting device and a clamping bracket, which in a on the Mounting device mounted linear guide slidably mounted and on which in the Groove in the Nutenscheibe engaging moldings is attached. This results in a very effective, yet simple design for the transfer gear.

In this case, advantageously, the clamping block with a replaceable attached to it Provided clamping jaws, in which one of the position of the forming groove in the bending head accordingly arranged, the shape of the workpiece to be clamped adapted shape groove is attached. As a result, in a simple manner only by replacing the jaw, the shape of the Form groove at a change of the workpiece to be bent whose changed Mold dimensions are adjusted.

Most preferably, the clamping block is mounted on a support member, which carries the molded body and is above this in engagement with the linear guide, wherein, again Preferably, this support member in turn sits on a support member on which it is in a Direction perpendicular to the orientation of the linear guide adjustably mounted and on the Shaped body is mounted for sliding engagement with the linear guide. Particularly preferred while the support member on the support member to adjust against this to a Drive device connected.

For a total of a very compact overall structure for the clamping device is achieved, the also associated with a relatively small footprint.

Especially recommended is in a bending device according to the invention, when the Clamping device, seen in the feed direction of the workpiece, nor a wrinkle smoother is immediately upstream, through which a wrinkling on the to be bent Workpiece just in the bend upstream workpiece area can be avoided. This prevents that to be bent z. B. Pipe material during bending folding makes or tears up. Any suitable design can be provided for the wrinkle smoother be particularly preferred, however, he can be applied against the workpiece to be bent Sliding blocks on.

For controlling the three different rotary drives and possibly further Drive devices (eg., For adjusting the support member on the support member) is advantageously provided a program control device.

Another preferred embodiment of the bending device according to the invention consists also in that a further drive means is provided, through which the bending head in two mutually perpendicular, in each case to the feed direction of the workpiece to be bent in turn vertical directions is moved, which gives the possibility of the bending head under held by a chuck and projecting from this pipe (possibly already with a bend at its one end) down to below, below the same on its other side over and then back up to the workpiece bend in the other bending direction, in which case only the Tensioning device swung 180 ° and also the bending mandrel with the on his opposite side mounted mold groove in correct orientation to him then facing tube side must be spent. Everything can be done, with the exception of the lowering and the lateral displacement movement and the startup of the bending head, otherwise with rotational movements of the bending mandrel or the clamping device (about the same axis of rotation as reach the mandrel), in which case again the linear movement of the clamping device against the bending mandrel on the third rotary drive, as before, can be generated (where then only the reversing gear are also rotated in a rotated position by 180 ° got to).

A further advantageous embodiment of the bending device according to the invention also exists in that on the side of the workpiece on which the clamping device is arranged, this instead of a Faltenglätters a stationary mounted guide roller for the workpiece upstream, which may be arranged so that they, if desired, with a can press against the corresponding side of the workpiece certain pressure.

Also, a preferred embodiment of the invention is also that the Bending mandrel as well as the clamping jaws of the clamping block each in the form of a roll with a Guide groove for abutment against the facing side of the workpiece to be bent is formed, resulting in a simplified design again the inventive bending device results in a particularly compact design. If Then, again preferably, the wrinkle smoother at least two in the feed direction of the bending Workpiece has successively arranged pressure rollers (instead of the sliders), then is thus created a bending device according to the invention, with which it is possible, even in the Wind method to produce the desired bend. Depending on the relative position of the roll of the clamping block to the mandrel, the bending radius produced on the workpiece by the Clamping device can be continuously changed, thus producing a elliptical, oval or spiral bends is possible.

In the bending device according to the invention may be any suitable form of a bending mandrel be used, such. B. in the form of a circular roller with a corresponding circumferential Shaped groove. Particularly preferably, however, the bending mandrel is designed so that it, parallel to seen from its pivot axis, a non-rotationally symmetrical, but to a vertical lying to the axis of rotation and extending through this central axis symmetrical shape having, attached to the mandrel forming groove for abutment against one side of the bending workpiece, seen relative to this longitudinal central axis, on both sides of the bending mandrel also symmetrical to each other. Such a configuration gives a special preferably usable mandrel, which is not about when changing the bending direction 180 °, but only has to be rotated by a small angle. Overall, the inventive bending device of very compact and space-saving design, can be readily used for a right as well as for a left bend, wherein always also the advantage is given that the rotary shafts for mandrel, transfer gear and Clamping the corresponding movements of these individual facilities by pure Rotary movements, in addition to an identical central axis (because of the concentric can cause transmission waves arranged to each other). This allows one especially fast and precise control of the individual movements independently from each other.

The bending device according to the invention is very compact and allows a large Bend freedom, namely both small distances between successive bends as even small distances of the bends from the ends of the prefabricated pipe workpieces, whereby a gentle material treatment can be ensured. There is also the Possibility to build up the bending tools used multi-level, in order to both different bending radii, as well as different tube diameter with a Mold to mold. The many realized in the invention degrees of freedom Device allow optimal adjustability to the particular circumstances, such. B. Pipe diameter, wall thickness, material or bending radius.

Fig. 1 eine perspektivische Schrägansicht auf eine erfindungsgemäße Biegevorrichtung;

Fig. 2 eine (teilweise prinzipielle) Schnittdarstellung gemäß einer Lage der Schnittebene senkrecht zur Zuführrichtung des zu bearbeitenden Werkstücks und durch die gemeinsame Drehachse der drei konzentrisch ineinander angeordneten Drehwellen;

Fig. 3 eine perspektivische Explosionsdarstellung des oberen Abschnitts des Biegekopfes bei einer erfindungsgemäßen Biegevorrichtung;

Fig. 4 die in Fig. 3 dargestellten Teile in zusammengebautem Zustand (teilweise geschnitten);

Fig. 5 eine (prinzipiell dargestellte) Draufsicht auf einen erfindungsgemäßen Biegekopf mit eingelegtem Rohr;

Fig. 6 die Darstellung aus Fig. 5, jedoch mit angelegter Spanneinrichtung .und angelegtem Faltenglätter;

Fig. 7 die Draufsicht gemäß Fig. 6, jedoch nach Durchführung der Biegung des Rohres um 90°;

Fig. 8 eine prinzipielle Draufsicht auf einen Biegekopf wie in den Fig. 5 bis 7, hier jedoch in der Ausgangsposition für ein Biegen in der gegenüber den Darstellungen der Fig. 5 bis 7 anderen Biegerichtung (mit oben liegendem Rohrwerkstück und nach unten gefahrenem Biegekopf);

Fig.9 die Darstellung aus Fig. 8 mit in Richtung auf die andere Seite verfahrenem Gleitbacken des Faltenglätters und verdrehten Führungsbacken desselben;

Fig. 10 die Darstellung aus Fig. 9, jedoch mit in die endgültige seitliche Lage auf der gegenüberliegenden Seite versetztem Gleitbacken des Faltenglätters und um nahezu 180° verdrehten Führungsbacken desselben;

Fig. 11 eine Draufsicht auf den Biegekopf der Fig. 8 bis 1.0 mit angefahrener Spanneinrichtung, ausgerichteten Biegedorn und herangefahrenem Faltenglätter;

Fig. 12 eine schräge Perspektivansicht einer erfindungsgemäßen Biegevorrichtung in der Stellung, die in Fig. 11 in Draufsicht gezeigt ist;

Fig. 13 eine perspektivische Schrägansicht zur prinzipiellen Darstellung einer anderen Ausführungsform eines Biegekopfes bei einer erfindungsgemäßen Biegevorrichtung, und

Fig. 14 eine Draufsicht auf eine wieder andere Ausführungsform eines Biegekopfes bei einer erfindungsgemäßen Biegevorrichtung, die zur Herstellung der Biegung des Rohrwerkstücks durch Winden geeignet ist.

The invention will be explained in more detail by way of example with reference to the drawing in principle. Show it:

1 is a perspective oblique view of a bending device according to the invention.

2 is a (partially schematic) sectional view according to a position of the cutting plane perpendicular to the feed direction of the workpiece to be machined and through the common axis of rotation of the three concentric nested rotary shafts.

Fig. 3 is an exploded perspective view of the upper portion of the bending head in a bending device according to the invention;

Fig. 4 shows the parts shown in Figure 3 in the assembled state (partially cut).

5 shows a plan view (shown in principle) of a bending head according to the invention with inserted tube;

FIG. 6 shows the illustration from FIG. 5, but with the tensioning device applied and the wrinkle smoother applied;

FIG. 7 shows the top view according to FIG. 6, but after the bending of the tube has been performed by 90 °; FIG.

8 is a schematic plan view of a bending head as in FIGS. 5 to 7, but here in the starting position for bending in the opposite direction to the illustrations of FIGS. 5 to 7 other bending direction (with overhead tube workpiece and driven down bending head) ;

9 shows the representation of FIG. 8 with the sliding jaws of the fold smoother and twisted guide jaws moved in the direction of the other side;

Figure 10 shows the illustration of Figure 9, but with the same in the final lateral position on the opposite side sliding jaws of the Faltenglätters and rotated by nearly 180 ° guide jaws.

11 shows a plan view of the bending head of FIGS. 8 to 1.0 with the clamping device, aligned bending mandrel and folded smoothing device approached;

Fig. 12 is an oblique perspective view of a bending device according to the invention in the position shown in plan view in Fig. 11;

13 is a perspective oblique view for illustrating in principle another embodiment of a bending head in a bending device according to the invention, and

Fig. 14 is a plan view of yet another embodiment of a bending head in a bending device according to the invention, which is suitable for producing the bending of the tube workpiece by winds.

In the following description of the figures, the illustrations of Figures 1 to 12 relate to a first, particularly advantageous embodiment of a bending device, while in Fig. 13 (in oblique perspective view) another embodiment for a bending head in a Such a bending device and in Fig. 14 is a basic plan view of one another Embodiment for a bending head is shown. It will be in all figures, even so far they relate to modified embodiments, the same reference numerals for the same parts used.

First, reference is made to Figures 1 to 12, which is a first embodiment of a Represent bending device.

Thus, Fig. 1 shows a perspective view (obliquely from the top front) on a bending device 1 briefly before performing a right bending, while in Fig. 12 the same perspective Oblique representation of the same bending device 1 is shown, but in the initial state before a left bend process.

As can be seen from Fig. 1, the bending device 1 comprises essentially three important Means, namely a bending head 2 (with a clamping device 3), further a Slide rail 4 (as feeder) and a fold smoother 5. These three devices serve for producing bends on pre-assembled lines or pipes 6, to a achieve good forming without wrinkling or cracking on the pipe 6.

The bending device 1 can be moved in its entirety on a horizontal trajectory a and a vertical trajectory b , by means of a suitable (but not shown in the figures) corresponding drive.

The bending head 2 initially consists of a supporting body 2A, on which a bending mandrel 7 rotatable about a central axis M is arranged on top. The side of the mandrel 7 is a tubular workpiece 6 (with relatively small wall thickness) in a bending mandrel mounted there, over three sides of the same extending groove 8, which is adapted in its groove shape of the shape of the tube 6. The tube 6 is fed in the direction c by a (not shown in the figures) transport device, from which it exits via a (also not shown in the figures) collet by means of which it can be kept fixed in position in a certain position at any time. By means of the feeder or the collet, it is also possible to rotate the tube 6 about its longitudinal axis in the direction of rotation d , in both directions of rotation.

As can be seen from the sectional view of FIG. 2 (sectional view along a Sectional plane which is perpendicular to the longitudinal direction of the supplied pipe 6 and through the axis of rotation M of the bending mandrel 7 extends), surrounds in Fig. 2 only with a solid line shown in principle support body 2A an arrangement of three concentric nested rotary shafts 9 ', 10' and 11 ', which run as a running Hollow shafts are formed. The three different hatching in Fig. 2 serve to the individual power transmission paths of the three rotary actuators 9, 10, 11 via the associated Rotary shafts 9 ', 10', 11 'to represent the parts to be rotated, each hatching to a parts belonging to a drive train.

In this case, each of the rotary shafts 9 ', 10' and 11 'by means of its own rotary drive 9, 10 and 11 driven, wherein the rotary drive 9 directly below the centrally located in the middle Rotary shaft 9 sits for the mandrel 2, which in turn at the upper end of the rotary shaft 9 'under Interposed connection of a likewise only shown in principle tool holder 7 'attached is. The rotary drive 9 drives directly the rotary shaft 9 ', the tool holder 7' and the on this sitting bending mandrel 7 at.

The central rotating shaft 10 'of the concentric rotary shaft assembly becomes at its lower End driven by a belt drive 13 by a rotary drive 10 and in turn serves for propelling a groove plate 25 via a rotary flange 10 "attached to it at its top, will be discussed in more detail below.

The outer rotary shaft 11 'of the concentric rotary shaft assembly is connected via a Belt drive 14 driven by a rotary drive 11. At her upper end is at her one rotatable mounting plate 15 is fixed on which a mounting device 16 is mounted and in the a linear guide 17 is formed, which - will be discussed below - the Guiding a linear movement in the direction of the position of the bending mandrel 7 out (or of this way) for a sliding in the linear guide 17 part allowed.

The bending mandrel 7 is laterally associated with a clamping jaws 18 (cf., Fig. 1 and 2 and in particular the enlarged views of FIGS. 3 and 4), on its the bending mandrel. 7 facing side carries an interchangeable jaws 19, in which (in particular good from Fig. 3 can be seen) facing the tube to be bent 6, a forming groove 28 of the Shape of the tube 6 corresponding size is formed.

The clamping block 18 with the clamping jaws 19 is mounted on a support member 20, z. B. not with shown screws attached.

The support member 20 sits in turn on a support member 21 and that in the from Exploded view of Fig. 3 clearly visible manner: on the bottom of the Retaining element 20 is a T-shaped, downwardly open mold groove 22, transverse to Displacement direction of the clamping jaw 18 running, trained, in the one on top of the Support member 21 mounted nut 21 'with a corresponding T-shaped cross-section is positively inserted. This makes it possible, the support member 20 transverse to Move direction of the clamping block 18 on the support member to move laterally to a be able to adjust very specific relative position of the clamping block 18 to the rotary mandrel 7.

On the underside of the support member 21 is a molded body in the form of a rotatable roller 23rd attached, which projects there and in a corresponding mold groove 27 (see Figures 1 to 4) intervenes. This roller 25 sits freely rotatable on an anchored in the support member 21 retaining bolts 26th

In addition, the support member 21 is provided with a shape such that it, in particular the Fig. 2 and there partially cut Fig. 4 show, to its two sides by the there in the support device 16 mounted linear or longitudinal guide 17 is guided and in whose longitudinal direction is displaceable.

When the Nutenscheibe 25 from the rotary drive 10 via the belt drive 13 and the rotary shaft 10 ' is rotated, it means that the eccentrically mounted on the Nutenscheibe 25 Formnut 27 by changing their rotational position, the engaging role in her 23 accordingly to the rotation axis M shifts what about the linear guide 17 to a corresponding Displacement movement of the support member 20 and mounted on this Spannbocks 18 with his jaws 19 in the direction of the rotary mandrel 7 out or from leads this way.

The mounting device 16 with the attached to her linear guides 17 in Cooperation with the support member 21, which attached to this over the retaining pin 26 rotatable roller 23 and the groove plate 25 with the attached in her, eccentric extending groove 27 in their interaction form a transfer gear 24, which serves the rotational movement of the rotary shaft 10 ', which serves for the displacement of the clamping device 3, in a linear adjustment movement of the holding part 21 (and thus of the attached thereto Holding element 20 and the clamping block 18 with clamping jaws 19) to effect. Thereby, that the support means 16 is mounted on the holding plate 15, it is ensured that the Linear guides 17 in the mounting device 16 at a rotation of the groove plate 25th does not rotate when the holding plate 15 is not in turn rotated. To this The way is the transmission of the rotational movement of the groove plate 5 in one Linear movement of the support member 21 and thus the clamping device 3 for clamping the Pipe piece 6 or guaranteed to its release. It can be ensured that the clamping device 3 with a desired or predetermined clamping force the pipe section. 6 presses against the mandrel 7. In this state can then be used to execute the Bending operation by a common rotation of the groove plate 25 and the holding plate 15th the bending process while maintaining the clamping of the tubular workpiece. 6 be made.

As can be seen particularly clearly from FIGS. 3 and 4, it sits on top of the mounting device 16 a fork-shaped cover plate 29, which consists of a front substantially circular Section with a circular inner opening for attachment to the upper end of the Turning flange 10 "and starting from this section with two in the longitudinal direction of Mounting device 16 is provided extending lateral fork legs 30, whose each rests on the top of a respective side part 33 of the support means 16 and about in this fork legs mounted holes 31, which correspond to holes 32nd are assigned on the top of the side parts 33, fixed by means of screws on this become. The lateral fork legs 30 of the cover plate 29 are slightly wider than the each underlying upper side of a side part 33 executed and form with the free Gap 30 'between them another longitudinal guide for a stepped upper mold area 21 "of the support member 21, so that the latter in its longitudinal movement in the direction of the Bending mandrel 7 back and from this back both through this gap 30 'between the Fork legs 30, as well as by the mounted in the support means 16 below Longitudinal strips of the linear guide 17 is guided. The mounting device 16 is at her from the Rotary mandrel 7 opposite end with a slightly upwards over the side parts 33 projecting Connection plate 34 is provided, which the interior 35, between the side legs 33 and the holding plate 15 is present, in the direction of the bending mandrel 7 off. At the same time, this connecting plate 34 also serves as an end stop for the supporting part 21 in FIG Meaning a maximum extended position.

As is also apparent from FIG. 3, on the underside of each side part 33 is a recess 36 mounted, which makes it possible that through them the Nutenscheibe 25 with the on her formed eccentric groove 27 between the respective side part 33 and the outer Circumference of the rotary flange 10 "25 are passed during rotation of the grooved disc can, as can be seen in detail from Figs. 3 and 4, on the representation thereof is expressly referred to.

Figures 5 to 7 show now, in a basic plan view of the bending head of the Figures 1 to 4, different processes for producing a 90 ° bend of a Pre-assembled tube 6 with thin wall thickness.

Here, Fig. 6 shows first the insertion position of the bending device 1, in which the Bending mandrel 7 with its mold groove 8 against the facing side of the supplied pipe. 6 is applied while the chuck 3 from the mandrel 7 and the tube 6 is removed. from Wrinkle smoother 4 are on the side on which the mandrel 7 is located, two guide jaws 38 with also formed on them forming grooves 41 (Fig. 12) in alignment with the mold groove 8 of the Bending mandrel 7 also applied to the workpiece 6, each guide jaw 38, as shown Fig. 1 can be seen, is attached by means of a screw 39 to an associated holder 40.

On the opposite side of the tube 6, associated with the clamping jaws 38, a Sliding jaws 37 of the Faltenglätters 4 is provided, which, as shown in FIG. 5, in the loading position as well as the clamping device 3 is moved away from the wire 6.

As shown in FIG. 1, the slide rail 4 is mounted on the bending head 2 and contains two Spindle drives 60, 61, via which a plate 62 with the sliding block 37 in a plane can be positioned. In this case, the slide rail 4 with respect to the axis of the tube 6 is always positioned on the side of the tensioner 18. A sliding block 37 is located on the pipe 6. Depending on Use case, the slide 4 during the bending process different Perform functions: it runs z. B. with the tube 8, pulls it back or pushes it, for example, to avoid cracking in the pipe material. In the illustrated Embodiment of FIG. 1, the slide rail 4 also for positioning the Support member 20 with the clamping block 18 and the clamping jaws 19 and the Pivoting the holder 40 with the guide jaws 38 of the Faltenglätters 5 used.

The holder 40 of the Faltenglätters 5 with the attached guide jaws 38 is mounted by means of linear guide pairs 63 on the slide rail 4. The linear guide pairs 63 are connected to each other via a bridge 64. The wrinkle smoother 5 can be moved or adjusted via suitable means (not shown in detail) in the direction of the arrow F (FIG. 1), whereby it can also be rotated relative to the bending mandrel 7 (likewise not shown in detail). As a result, an optimal adjustment of the Faltenglätters 5 can ensure both left and right bending.

When in the insertion position shown in Fig. 5, the tube 6 against the facing forming grooves 8 and 41 (Fig. 12) of the rotary mandrel 7 and the two guide jaws 38 of the Faltenglätters 5 is applied, then the clamping device 3 by rotation of the groove plate 25 in the direction of the arrow y _{2 brought} into abutment against the rotary mandrel 7 opposite side of the tube 6 and tightened with a desired clamping force. This situation is shown in FIG.

Subsequently, as shown in FIG. 7, a simultaneous, rectified and equal speed turning of the bending mandrel 7 (in the direction of rotation w ) and the holding plate 15 (together with the holding device 16) and the grooved disk 25 in the direction of rotation y ₂ (as in FIG indicated) by 90 °, wherein (by suitable, not shown means) of the sliding jaws 37 of the Faltenglätters 5 according to the feed rate of the tube 6 with this and in Appendix to this in the direction shown in Fig. 7 direction f is linearly moved.

In this case, in the interaction between bending mandrel 7 and clamping device 3, the tube 6 to 90 ° in the forming groove 8 in a circular end portion 46 (see Fig. 11) of the bending mandrel 7 (in whose area is bent around its axis of rotation M) and then reaches an end position, as shown in Fig. 7. In Fig. 7, a right bend is shown.

Figs. 8 to 11 now show, also in a plan view as Figs. 5 to 7, a bend in opposite direction as in Figs. 5 to 7, namely a left turn.

For this purpose, the bent tube 6 is first held in the position of a (not shown in Fig. 1) collet, which results from Fig. 7. Subsequently, 25 of the clamping jaws 19 is moved away from the mandrel 7 by rotating the Nutenscheibe; the sliding jaw 37 of the Faltenglätters 5 is also linearly moved away from the wire 6. Subsequently, the pipe section 6 is transported so much and simultaneously rotated by 90 ° upwards (in the direction of rotation d ) that the (previously already bent) pipe end has vertically upwards, as can be seen in the perspective view of FIG. 12 (there but already in the clamped state again).

When the tube 6 is released, the bending head 2 is moved away vertically downward (in the direction b ), so that the bending head 2 with the bending mandrel 7 is completely below the out of the collet protruding tube 6, after which, as shown in FIG. 8, the Bending mandrel 7 against the previous bending direction in the direction of rotation w (as indicated in Fig. 8) is pivoted. The covered by the pipe 6 parts of the underlying bending head 2 are shown in dashed lines in Figs. 8 to 10.

At the same time, the guide jaws 38 of the Faltenglätters 5 are pivoted in the direction of arrow shown in Fig. 8, wherein previously the sliding jaw 37 is moved back by a corresponding method of the slide rail 4 in the direction shown in FIG. 8 f from the end position shown in Fig. 7 , The intermediate position reached thereby is shown in FIG. 8.

In Fig. 9, another actuating step is shown, in which now, still lying with the bending head 2 below the pipe section 6, by common, equally fast and rectified rotation of the support plate 15 (with arranged thereon mounting means 16 with the clamping device 3) and Grooved disk 25 by 90 ° (in the direction of rotation y ₁ ) in one of the position of the clamping device 3 of FIG. 5 by 180 ° opposite position spent.

In addition, the guide jaws 38 of the Faltenglätters 5 are further rotated counterclockwise (in Fig. 9), likewise the sliding jaws 37 in the direction of arrow f ' also moved to the other side of the tube 6. This intermediate position can be seen in FIG. 9.

Fig. 10 shows the position which is achieved when the sliding block 37 together with the Clamping device 3 is spent in a position corresponding to the position of Fig. 5, wherein However, the elements each on the opposite side of the position in FIG Tube 6 is present.

Finally, FIG. 11 shows the starting position of tube 6, clamping device 3, bending mandrel 7 and folding smoother 5 relative to one another for left-hand bending, as corresponds in principle to the starting position for the bending process, corresponding to the position from FIG. 6 for right-hand bending. In this case, the sliding jaw 37 has been moved from the intermediate position shown in FIG. 10 a little further away from the tube 6, so that overall there is an open insertion position for the tube 6 again. Subsequently, the bending head 2 is raised again upward (in the direction of movement b (from FIG. 1)) and then with the bending mandrel 7 and the sliding jaw 37 of the Faltenglätters 5 against the one (in Fig. 11: the right) side of the pipe section 6 applied , wherein previously the bending mandrel 7 with its tube 6 facing the form of groove 8 was pivoted in alignment with the longitudinal axis of the tube 6. Subsequently, by a corresponding rotation of the Nutenscheibe 25 of the clamping block 18 of the clamping device 3 is applied with the clamping jaws 19 against the other side of the tube 6 and also brought the sliding jaws 37 with its mold groove 41 also on this side against the pipe 6 to the plant. Thus, the starting position shown in Fig. 11 (clamping position) of the tube 6 is reached, from which then by a common rotation of the mandrel 7 and clamping device 3 and the Nutenscheibe 25 by 90 ° (counterclockwise in Fig. 11) generates a corresponding left turn can be.

The initial position reached in FIG. 11 before the bending operation (to the left) is still shown in FIG. 12 once shown in a perspective plan view of the bending device.

For the shape of the bending mandrel 7, as in the embodiment of FIGS. 1 to 11 is used again, reference is made to the representation in Fig. 11:

The bending mandrel 7 is, in plan view, not rotationally symmetric, but mirror-symmetrical order one by its axis of rotation (corresponding to the axis of rotation M of the overall arrangement of the three in intersecting rotary shafts 9 ', 10' and 11 ') extending median plane X-X ( "Axis of symmetry"). The formed on the bending mandrel 7 Formnut 8 extends along the both longitudinal sides of the bending mandrel 7 shown in Fig. 11 and in the region 46, in which the Ends are connected to each other via a circular path, so that a total of three sides of the Bending mandrel 7 throughout the mold groove 8 extends, their shape formation in turn again symmetrical to the median plane X-X. This means that the inserted mandrel 7 can work with only a single Formnut 8 and it is not necessary to different Form grooves, even at different axial heights of the mandrel 7, use.

In FIGS. 13 and 14 are again schematic perspective oblique views of two further embodiments of a bending head 2 shown:

In the embodiment of FIG. 13, a particularly compact construction is achieved, wherein However, this embodiment only recommends if there is no risk of cracking or Wrinkling of the pipe to be bent and thus the slide rail 4 and the Wrinkle Smoothing 5 are unnecessary.

The sliding block 37 of the Faltenglätters 5 is in the embodiment of FIG. 13 by a Guide roller 42 replaced, which is arranged freely rotatable and the pipe to be bent before his Enema into the mold groove 8 of the mandrel 7 leads.

In the embodiment shown here, the bending mandrel 7 consists in principle of a Bending roll, which is not executed over a full circumference, but in the one part of the circumference is cut off, as shown in FIG. 13, to which reference is made.

In this embodiment, the clamping device 3 comprises a clamping jaw 43, the over a holding device 44 shown only in principle in FIG. 13 (in FIG. 13 in the form of a Pin shown), which in a radially extending slot guide 45 (in the form of a Langloches) is formed in the holding plate 15. This holding device 44 is below the Retaining plate 15, z. B. in a (not visible) eccentric guide led to the Central axis M of the rotary head 2 for moving the clamping jaw 43 relative to the pipe 6 is guided. In this case, this eccentric (in Fig. 13 not shown in detail) Formnut on the top of a rotatable about the central axis M, but below the holding plate 15th lying plate o. Ä. To be attached, which in turn z. B. on the central rotation shaft 10 'of the three rotating shafts 9 ', 10', 11 'running in one another for generating a movement of the Clamping jaw 43 is rotatable. A closer description of the special mechanism but this is not necessary because the person skilled in the design of such Rotary guide for adjusting movement of the mounting device 44 is familiar. She works in the remaining on the same principle as the Formnut-roller arrangement of the embodiment of FIG. 1.

The further embodiment of a bending head 2 shown in FIG. 14 differs from FIG the other previously described embodiments in particular in that there instead of the sliding block 37 two guide rollers 47, 48 for lateral contact against the bending pipe 6 provided and the clamping block 3 (in the transport direction c of the pipe. 6 seen) are connected upstream.

On the clamping head 3, the clamping jaws 19 are no longer provided with a guide groove, such as in the embodiments of the preceding figures, but with a bending roller 49, with the desired deformation of the tube 6 can be performed.

The mandrel is in this embodiment as a bending roller 50 with a circumferential Form groove designed to rest against the pipe section 6.

The movement of the tensioning device 3, the rotation of the bending mandrel 50 and the application or Tracking the Faltenglätters 5 happens in the same manner as in the embodiments according to FIGS. 1 to 13 by a corresponding program control of the three used Rotary drives 9, 10 and 11, which are arranged on three concentric rotating shafts 9 ', 10' and 11 'act on the parts to be moved, as shown in principle in the sectional view of Fig. 2 is already shown.

Claims (18)

Bending device (1) for rod and tubular workpieces (6) having a bending head (2) with a on a rotation axis (M) mounted by means of a rotary drive (9) rotatable bending mandrel (7) and with a clamping device (3) for pressing the workpiece to be bent (6) against a forming groove (8) on the mandrel (7) and further comprises a feed device (4) for the workpiece to be machined (6), wherein the clamping device (3) relative to the mandrel (7) movable and also concentric with the axis of rotation (M) of the bending mandrel (7) is pivotable, characterized in that the clamping device (3) is connected to two mutually independent rotary drives (10, 11), one (11) for performing its pivoting movement about the axis of rotation (M ) of the bending mandrel (7) and on the other they with the interposition of a transfer gear (24), which converts a rotary movement into a linear movement, relative to the bending mandrel (7) is movable, wherein the bending head (2) to Übert ragung of the drive of the three rotary drives (9, 10, 11) to the bending mandrel (7), to the transfer gear (24) and to the clamping device (3) comprises three concentric nested rotary shafts (9 ', 10', 11 '), each of which is connected to one of the rotary actuators (9,10,11). Bending device according to claim 1, characterized in that the innermost rotary shaft (9 ') carries the bending mandrel (7) arranged at the top of the bending head (6). Bending device according to claim 2, characterized in that the middle rotary shaft (10 ') drives the transfer gear (24) mounted on the bending head (2) below the bending mandrel (7) for the linear movement of the clamping device (3). Bending device according to claim 3, characterized in that the outer rotary shaft (11 ') with a below the transfer gear (24) arranged holding plate (15) on which the clamping device (3) in a direction perpendicular to the central axis (M) of the three concentric Rotary shafts (9 ', 10', 11 ') is slidably mounted rotatably connected. Bending device according to one of claims 1 to 4, characterized in that the transfer gear (24) is provided with a groove (25) formed therein, to its axis of rotation (M) eccentrically extending groove (27) into which a on the clamping device (3) fixed, the cross-sectional shape of the groove (27) corresponding shaped body (23) engages in the groove (27) displaceable and whose distance from the axis of rotation (M) of the grooved disc (25) by a rotation thereof is variable. Bending device according to claim 5, characterized in that the tensioning device (3) has a holding device (16) fixed to the groove plate (25) in a rotationally fixed manner and a clamping block (18) which is displaceably mounted in a linear guide (17) mounted thereon to which the molded body (23) engaging in the groove (27) in the groove disc (25) is fastened. Bending device according to claim 6, characterized in that the clamping bracket (18) is provided with a clamping jaw (19) removably attached to it, in which one of the position of the forming groove (8) in the bending head (2) correspondingly arranged the shape of the workpiece to be clamped (6) adapted form of groove (28) is mounted. Bending device according to claim 6 or 7, characterized in that the clamping bracket (18) is mounted on a support element (20) which carries the shaped body (23) and is in engagement therewith with the linear guide (17). Bending device according to claim 8, characterized in that the support element (20) in turn sits on a support member (21) on which it is adjustably mounted in a direction perpendicular to the orientation of the linear guide (17) and on which the molding (28) is slidably engaged the linear guide (17) is mounted. Bending device according to claim 9, characterized in that the support element (20) is connected to the support part (21) for adjustment to a drive device. Bending device according to one of claims 1 to 9, characterized in that the clamping device (3), seen in the feed direction (c) of the workpiece (6), a Faltenglätter (5) is immediately upstream. Bending device according to claim 11, characterized in that the fold smoothing means (5) can bear against the work piece (6) to be bent sliding jaws (37). Bending device according to one of claims 1 to 12, characterized in that a program control for controlling the various rotary drives (9, 10, 11) and drive means is provided. Device according to one of claims 1 to 13, characterized in that a further drive means is provided by which the bending head (2) in two mutually perpendicular, in each case to the feed direction (c) of the workpiece to be bent (6) in turn perpendicular directions (a, b) is movable. Bending device according to one of claims 1 to 10, characterized in that on the side of the workpiece (6) on which the clamping device (3) is arranged, this a stationary mounted guide roller (42) for the workpiece (6) is connected upstream Bending device according to one of claims 7 to 14, characterized in that the bending mandrel as well as the clamping jaws of the clamping block (18) each in the form of a roller (50; 49) with a guide groove for abutment against the facing side of the workpiece to be bent (6). is trained. Bending device according to claim 11 or one of claims 13 to 16 in conjunction with claim 11, characterized in that the fold smoother (5) has at least two in the feed direction of the workpiece to be bent (6) arranged behind one another pinch rollers (47). Bending device according to one of claims 1 to 14, characterized in that the bending mandrel (7), viewed parallel to its pivot axis (M), a non-rotationally symmetrical, but to a perpendicular to the axis of rotation (M) lying and extending through this central axis (XX ) has symmetrical shape, wherein the forming mandrel (8) mounted on the mandrel (7) for abutment against a side of the workpiece to be bent (7), relative to this longitudinal center axis (XX) seen on both sides of the mandrel (7) also runs symmetrically.

Images