EP0227674B1 - Method and device for the helicoidal winding of sheet-like material - Google Patents

Method and device for the helicoidal winding of sheet-like material Download PDF

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Publication number
EP0227674B1
EP0227674B1 EP85904579A EP85904579A EP0227674B1 EP 0227674 B1 EP0227674 B1 EP 0227674B1 EP 85904579 A EP85904579 A EP 85904579A EP 85904579 A EP85904579 A EP 85904579A EP 0227674 B1 EP0227674 B1 EP 0227674B1
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EP
European Patent Office
Prior art keywords
bending
guide surface
strip
axis
guide
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Expired
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EP85904579A
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German (de)
French (fr)
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EP0227674A1 (en
Inventor
Walter Schwarz
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes

Definitions

  • the invention relates to a method for coreless, helical winding of material strips, in particular sheet metal strips, to tubes with essentially angular cross-sectional areas, the continuously advancing material strip being in each case after a predeterminable feed length by an inside angle of the cross-sectional area obliquely to the feed direction under the action of an inward force curved guide surface is bent, the inlet side of which lies in the feed plane, the bending guide of the material strip to form the subsequent flat material band section being released again when the exit side of the guide surface is reached, and a device for carrying it out.
  • An essentially angular cross-sectional area is to be understood as a cross-sectional area delimited by straight lines which merge into one another by means of arcs, so that the tubes have rounded edge regions.
  • a method and an apparatus of this kind are known from US-A-2 339 219.
  • a rotary cage is provided there, which has inner wall sections parallel to the tube walls. During each bending process, depending on the cross-sectional shape, at least one inner wall section bears against a pipe wall, via which the bending forces are introduced from the rotary cage. Since the curved guide surface lies in the center of the rotary cage, the force is generally applied on a side opposite the bending center.
  • an eccentrically articulated bending arm is additionally provided as a bending tool, which engages on an unsupported area on the material band section to be bent outside of the guide surface, rotated with the rotating cage and, at the end of the bending process, detached from the rotating cage and pivoted back into the starting position in order not to hinder the further feed. Since a bending guide is not provided in the bending area along the guide surface, but rather the material band is freely bent, an exact, uniform rounding of the edge areas is not possible. Furthermore, a separate rotating cage must be used for each cross-sectional shape and size.
  • DE-A-2 228 935 describes a method according to which a sheet-metal band provided with folded edges is inserted obliquely into a bending station in the cycle feed, fixed to the guide table by means of a hold-down device and bent over the table edge by means of a bending tool arranged above the guide table. After the bending tool has moved back to the starting position, the metal strip is moved by the next feed length. pushed on and then fixed again and folded.
  • Winding method for square tubes in which the material strip is wrapped around a core are known from US-A - known 2,736,286, 2,440,792 and 2,640,451.
  • the use of a core is disadvantageous insofar as a separate core and the adaptation of the bending and connecting devices pressing against it is required for each desired cross-sectional area.
  • Tubes with a round cross-section can be wound from relatively narrow strips of material of great length, which are pulled off rolls, in a continuous workflow around an imaginary core, so that the tubes can have any diameter. (AT-B-248 839 and 316 283).
  • the seam seam tubes are wound by means of pairs of rollers, which at the same time also close the seam seam.
  • the material strip is freely bent by a number of strokes or strokes of a tool in the vicinity of an abutment.
  • Non-circular tubes can also be produced if periodic changes in the criteria causing the curvature occur. This procedure can only be used with welded seam pipes, since the striking machining is impossible with folded fold edges.
  • the object of the invention is now to find a method and a device for the continuous core-free production of tubes with an essentially angular cross-sectional area, whereby an exact bending guidance is to be achieved.
  • this object is now achieved in that the bending forces are introduced radially to the bending axis during the entire bending process, the bending axis representing the axis of curvature of the guide surface.
  • the process according to the invention thus represents a continuous winding process which is independent of the seam formation. It is possible to produce angular pipes with rounded edges of any length without interrupting the tape feed and while maintaining the guidance even during the bending process, with the choice of the arc length and the length of the flat ones Sections of pipes with any convex cross-sectional area and any number of corners can be produced.
  • a device for carrying out the method according to the invention with a guide table for the incoming material strip, a rod arranged in the edge region of the tube that forms, which extends at a distance corresponding to the material strip thickness above the guide table over at least two windings of the tube and is provided with a convexly curved guide surface is, with a bending tool that is pivotable about an axis parallel to the support plane of the guide table and at the end of the bending process with release of the material feed into the starting position is moved back, characterized in that the bending tool is formed by a flat bending plate inserted into the guide table, the upper side of which the material band guides during the bending process, swivels upward from the support plane on the guide surface, the pivot axis being in the axis of curvature of the guide surface, and on End of the bending process about an axis parallel to the pivot axis from the guide surface in the support plane and finally moves back to the starting position.
  • the material strip entering the gap between the rod and the support plane of the guide table is fed into the guide table, taking into account the angle between the direction of entry and the longitudinal direction of the pipe, by the extent of the desired side length of the cross-sectional area of the pipe to be produced, minus a double arc portion, and then the bending plate the support level swung up.
  • the continuous sheet metal strip is guided centripetally on the guide surface of the rod and bent accordingly. As soon as the arc length corresponding to the desired internal angle between the two side surfaces of the resulting tube is reached, an axial locking is created between the bending plate, which rotates about the axis of curvature of the guide surface during the bending process, and the guide table.
  • the bending plate is folded down into the guide table around the table-fixed axis that is parallel to the axis of curvature.
  • This tischfes t e axis formed thereby with respect to the gap between the rod and the guide table the incoming strip of material over so that the upper surface of the bending plate in the folding movement of the guided on the guide surface material web lifts off and does not hinder the continuous further advance of the tape, wherein the side wall part of the pipe that has just been bent also moves.
  • the bending plate During the advance of the next section of the material strip corresponding to a second side of the cross-sectional area, the bending plate returns to its starting position after the axial locking has been released. The next bending process can then be initiated.
  • the top of the flat bending plate twists to achieve the centripetal guidance during the bending process, always parallel to a tangential plane of the guide surface.
  • the bending plate has at least one bearing pin which engages in a guide slot running parallel to the guide surface of the rod, and can be locked in the bending end position to form the table-fixed axis parallel to the axis of curvature, at least one controlled one on the bending plate Actuating lever is articulated.
  • a control cam, the drive of which is coordinated with the feed of the material strip, is provided in particular for the movement of the actuating lever.
  • a spring-loaded locking lever is preferably used, which locks at the end of the bending operation on the bearing pin, a release extension being provided on the locking lever, which the folding plate which folds down acts upon the end of the folding-back movement.
  • the device which is generally equipped with a pair of closing or welding rollers, for connecting the longitudinal edges of the material strip by winding the tube, can in itself be provided at any point. It is favorable to arrange them at the narrowest point of the gap between the rod having the guide surface and the guide table or the bending plate still engaging in this area, since there is no need to change the location of the pair of rollers.
  • the rod is hollow cylindrical, and in it the inner connecting roller with respect to the tube to be formed is arranged parallel to the feed direction. Since their drive is generally required, it is attached to a shaft which extends obliquely into the hollow cylindrical rod.
  • a passage slot is provided in the hollow cylindrical rod for the inner connecting roller, through which it contacts the edges of the material strip to be connected.
  • the outer counter roller is arranged in the guide table.
  • the tube that forms is swung up from the bending plate. It is particularly advantageous for pipes with a larger cross-sectional area to provide an opposite support when the unstable equilibrium position is exceeded, on which the pipe rests until the bending process is completed.
  • a support plate is formed opposite to the bending plate, which is also guided centripetal on the guide surface.
  • the support plate arranged in the guide table which is offset in relation to the bending plate in the longitudinal direction of the tube by at least the width of the incoming material strip, is also pivoted up and returns directly to the starting position after taking over the forming tube.
  • the sequence of movements is similar to that of the bending plate, it can also be controlled in a similar manner, for which purpose preferably at least one actuating lever and one control cam are provided. If cam disks are provided as control cams, these are preferably each associated with an intermediate lever articulated on the actuating lever. Another possibility provides that a radially extending arm is provided as the cam control, at the free end of which a driver pin is arranged, and that at the free end of each actuating lever there is a latching groove into which the driver pin over an angular range of its Engages rotary motion.
  • Both control cams are advantageously arranged on the same drive shaft, the rotation of which, as mentioned, is coordinated with the feed of the material strip.
  • a further support device for the pipe is recommended, each of which consists of a pair of plates that can be moved synchronously with the bending plate and the support plate and is arranged at a distance from it.
  • FIGS. 9 to 8 can be implemented, for example, with a device according to FIGS. 9 to 11.
  • a guide table 9 and a number of vertically arranged plate-shaped supports 27 are provided on a device frame.
  • a support element in the form of a hollow cylindrical rod 2 which has a length that comprises at least two, preferably three to four windings of the tube 12.
  • a swiveling bending plate 4 is arranged in the guide table 9 in the area of the incoming material strip 1, the length of which is approximately the same as that of the rod 2.
  • the top of the bending plate 4 lies in the table plane A, and two strips 29 are arranged on the underside of the bending plate 4, which extend perpendicular to the longitudinal direction of the tube 12 to be wound.
  • the bending plate extends, starting from a vertical axial plane through the hollow cylindrical rod 2, to the opposite side of the incoming material strip 1 with respect to the rod 2.
  • the downward-facing jacket half of the hollow cylindrical rod 2 forms a convexly curved guide surface 3 along which the incoming material strip 1 can be bent using the bending plate 4.
  • the entry side of the guide surface 3 for the bending of the material strip 1 lies in the vertical axial plane through the hollow cylindrical rod 2, that is to say at the narrowest point of the gap between the rod 2 and the table plane A, and the exit side corresponding to the inner angle to be bent Radians laid.
  • the bending plate 4 is guided during the pivoting movement from the table plane A upwards in circular arc-shaped guide slots 11 in the plate-shaped supports 27 through a journal 20 protruding laterally from the strips 29, with two instead of the strips 29 being used instead of the continuous journal 20 shown slightly superior bearing pins can be provided, and on the other hand moved via actuating levers 5 which are articulated on the strips 29.
  • the predominant direction of movement of the actuating levers extends approximately vertically upwards, the upper side of the bending plate 4 (naturally with the interposition of the material strip 1 to be moved) rolling on the guide surface 3, and this at all tangential planes to the guide surface 3 between those drawn out in FIG. 9 Lines shown starting position in table level A and the end bending position, which is shown in dashed lines for a 90 degree bending angle, passes through.
  • the movement of the bending plate 4 thus represents a rotation about the axis of the hollow cylindrical rod 2, wherein it is continuously pressed centripetal against the guide surface 3. Since the pivoting speed of the bending plate 4 is preferably coordinated with the feed speed of the continuously incoming material strip 1, there is only a slight relative movement between the bending material strip and the bending plate, which can only be attributed to the inclined entry angle of the material strip.
  • a support plate 21 is provided, which is offset in the longitudinal direction of the pipe relative to the bending plate 4.
  • the support plate 21, which can also be swiveled up from the table plane A, serves to take over the tube section already generated during each bending process when the unstable equilibrium position is exceeded and to correspondingly tilt it further by the bending plate 4 swiveling into the bending end position until the rest of the day on the table plane A support.
  • the support plate 21 is designed and arranged essentially symmetrically to the bending plate 4, ie it has on its underside at least one ledge 30 from which a bearing pin 22 protrudes on both sides and can be displaced in arcuate guide slots 23 of further plate-shaped supports 27.
  • this support plate 21 also rolls off on the guide surface 3 of the rod during the pivoting (of course also on the outside of finished tube windings which are guided centripetal), at least one actuating lever 25 being articulated on the strip (s) 30 of the support plate 21 .
  • the movement sequence of the bending plate 4 and the support plate 21 is controlled by a cam control.
  • a cam control According to FIGS. 1 to 9, in a first embodiment, two cam disks 7, 24 are arranged on a drive shaft 8, along the control curves of which rollers 18, 19 arranged on an intermediate lever 6, 26 each roll during rotation.
  • the intermediate lever 6 is articulated on the actuating lever 5 of the bending plate 4 and the intermediate lever 26 on the actuating lever 25 of the support plate 21.
  • the control curves of the two cam disks 7, 24 are designed differently.
  • the control of the actuating levers 5, 25 is not accomplished by cam disks.
  • arms 31, 32 protrude radially from the drive shaft 8 and have driver pins 33, 34 at the end. These are assigned locking grooves in the course of the rotation over angular ranges, which are provided at the ends of the actuating levers 5, 25.
  • the drive shaft 8 of the two diametrically opposite arms 31, 32 can be connected to the main drive, for example, via a magnetic coupling.
  • a disk is fastened to the drive shaft 8, on the circumference of which a notch 37 defining the rest position is formed.
  • a notch 37 engages with a locking lever 38 acted upon by a first compressed air cylinder 42.
  • a second compressed air cylinder 43 carries a plunger 39 for the actuation of the actuating lever 5.
  • the actuating lever 25 is assigned two further compressed air cylinders 44, 45 which move the plunger 40, 41, the plunger 41 being provided for latching on a nose 46 which is open End of the operating lever 25 protrudes outwards.
  • a return spring 47 shown only schematically, is provided between the device frame and the actuating lever 25, a stop (not shown) being located in the return path of the actuating lever 25.
  • FIGS. 1 to 8. 1 already shows at least one winding of the tube 12.
  • the material strip 1 runs, from the right in each case, on the guide table 9 into the device. 1 and 2, the already completed part of the tube 12 moves freely to the left, the bending plate 4 and the support plate 21 being sunk in the guide table 9.
  • the lower right, rounded edge region of the tube 12 in the drawing bears against the right half of the guide surface 3 of the rod 2. Since the feed of the material strip 1 is not interrupted, the part of the tube 12 which has already been completed must rotate upward (FIGS.
  • the bending plate 4 being pivoted upward via the cam control and the material strip 1 centripetal around the rod along the left half of the guide surface 3 is guided so that a deformation of the tube is prevented and an exact bending of the material strip 1 takes place.
  • the support plate 21, which, as mentioned, is offset in the longitudinal direction of the tube 12, swings up out of the guide table 9 and lies against the tube 12 (FIG. 4) .
  • the turning point of the pivoting movement of the support plate 21 is reached, which is pivoted back down into the guide table 9 in a controlled manner via the cam disk 24 and the two actuating levers 26, 25, whereby it (FIG.
  • the cam disk 7 has an approximately radially sloping end flank, so that the actuating lever 6 can drop directly downwards, the bending plate 4 rotating about the table-fixed axis 10.
  • the bending plate 4 thus lifts very quickly, namely at a speed that at least corresponds to the feed speed of the material strip, laterally from the guide surface 3 or the bent material strip, which ultimately also prevents the continuous feed of the material strip 1 due to the rounded edge region ( Fig. 8).
  • the cam disks 7, 24 still rotate back into the starting position and are only set in rotation again at the beginning of the next turning process.
  • the detent lever 13 has a release extension 14, which of the swiveling down Bending plate 4 is applied in the last part of the swivel path.
  • the locking lever 13 is thus pressed down and releases the bearing pin 20 again, whereby the table-fixed axis 10 is removed again.
  • the bending plate 4 pivoted back into the guide table can return to the starting position during the further advance of the material strip 1, for which purpose reset devices (not shown) are used.
  • a pair of plates arranged and controlled in the same way is provided at least at the end of the tube, which moves with the tube in the longitudinal direction, with a second support plate being provided here instead of the bending plate 4.
  • the actuation levers 5, 25 are controlled in the following way:
  • the bending process is triggered by an electrical pulse.
  • This actuates the aforementioned magnetic coupling of the drive shaft 8 and the two compressed air cylinders 42 and 45.
  • the drive shaft 8 is connected to the main drive via the magnetic coupling via a countershaft of a chain drive, with a selectable ratio which adjusts the rotational speed of the drive shaft 8 to the feed speed of the material strip 1.
  • the locking plunger 38 of the compressed air cylinder 42 is withdrawn from the notch 37 and gives the rotational movement of the arms 31, 32 arranged on the drive shaft 8.
  • the stop for the spring-loaded actuating lever 25 of the support plate 21 is arranged so that the latching groove of the actuating lever 25 is at the height of the drive shaft 8, so that in the intermediate position shown in FIG. 14 the driver pin 34 of the arm 32 snaps into the latching groove.
  • both operating levers 5, 25 are now positively guided by the arms 31, 32, so that the bending plate 4 pivots further up and the support plate 21, which increasingly takes up the weight of the tube being formed, into the table plane folds back.
  • the bending process is ended in the position shown in FIG. 15, the locking lever 13 locking the bearing pin 20 in the axis 10.
  • the compressed air cylinder 43 is acted on, on the one hand, whose plunger 39 laterally swings the actuating lever 5 so far that the driving pin 33 emerges from the locking groove, whereby the connection to the arm 31 is released.
  • the bending plate 4 falls or folds back about the axis 10 into the table plane, so that the further material band feed is not hindered.
  • the compressed air cylinders 44 and 45 are actuated so that the plunger 41 of the cylinder 45 is moved back into the locking position, and the actuating lever 25 is pivoted out of the plunger 40 of the cylinder 44.
  • the nose 46 is locked on the tappet 41 of the cylinder 45 and the driver pin 34 slides out of the locking groove, as a result of which the support plate 21 is held in the table plane.
  • the plungers 39 and 40 are reset during the further rotation of the arms 31, 32 (FIG. 17).
  • the latching plunger 38 engages in it while the drive shaft 8 is uncoupled. The cam control is thus ended for this bending process.
  • FIG. 16 shows an intermediate position in detail, which follows approximately at the intermediate position of the cam control shown in FIG. 17.
  • the guide slot 11 for the bearing pin 20 has a rectilinear return path 48, so that the bending plate 4 is returned to the starting position in a horizontal movement by the return device.
  • the locking lever 13 has a section 49 following its locking lug, which is aligned with the rectilinear return path 48 in the folded-back position of the bending plate 4, so that only this part of the guide slot 11 is free.
  • the connecting device which continuously connects the incoming material strip 1 to the last tube winding, is not in itself part of the invention, and can for example comprise a pair of folding closing rollers, one of which is provided inside the resulting tube 12 and the other outside.
  • the connection or fold closure takes place in a particularly simple manner at the only point which does not move relative to the guide table and which the tube passes through during the winding, namely in the vertical axial plane of the rod 2, so at the narrowest point of the passage gap.
  • the inner closing roller 15 is now arranged on an axis or driven shaft 16 projecting obliquely into the hollow cylindrical rod 2, a passage opening 17 being provided in the wall of the rod 2 within the guide surface 3 (FIGS. 10, 11). so that the closing roller 15 is in direct contact with the connection area between the material strip 1 and the winding of the tube 12.
  • the outer counter roller is arranged in the guide table 9 below the closing roller 15, but is not shown for reasons of clarity. Since, depending on the width of the material strip 1 and the size of the tube 12 to be produced, the entry angle of the material strip 1 must be changed, the closing roller 15 and the counter roller underneath it can be pivoted about an imaginary vertical axis which extends through the axis of the rod 2 and The center of the two connecting rollers extends. 10 and 11, the maximum pivot angle between the shaft 16 and the rod 2 is shown.
  • the bending plate 4 and the support plate 21 have grooves, not shown, into which the fold edges of the material strip 1 or the folds protrude between the windings, so that the Bending plate 4 and the support plate 21 rest over the entire width of each winding and an exact guidance along the guide surface is achieved.
  • welding rollers can also be provided for welding the material webs.
  • the method is suitable for the production of continuously wound pipes with any essentially square cross-sectional areas, since both the inner angle to be bent and the side lengths can be selected.

Abstract

A method and a device for the spiral winding of tapes for the continuous production of tubes without a core and having an angular cross-sectional area. A tape is guided centripetally during each bending process along a convexly curved conducting surface situated in the region of the tube being formed, the intake side of which conducting surface is located at the feed level. The centripetal guiding of the tape is suspended when the conducting surface reaches the outlet side for forming the excluding level segment of the tape.

Description

Die Erfindung betrifft ein Verfahren zum kernlosen, schraubenförmigen Wickeln von Materialbändern, insbesondere Blechbändern, zu Rohren mit im wesentlichen eckigen Querschnittsflächen, wobei das sich kontinuierlich vorschiebende Materialband jeweils nach einer vorbestimmbaren Vorschublänge um einen Innenwinkel der Querschnittsfläche schräg zur Vorschubrichtung unter nach innen gerichteter Krafteinwirkung um eine gekrümmte Leitfläche gebogen wird, deren Eintrittsseite in der Vorschubebene liegt, wobei bei Erreichen der Austrittsseite der Leitfläche die Biegeführung des Materialbandes zur Bildung des anschließenden ebenen Materialbandabschnittes wieder aufgehoben wird, sowie eine Vorrichtung zu dessen Durchführung.The invention relates to a method for coreless, helical winding of material strips, in particular sheet metal strips, to tubes with essentially angular cross-sectional areas, the continuously advancing material strip being in each case after a predeterminable feed length by an inside angle of the cross-sectional area obliquely to the feed direction under the action of an inward force curved guide surface is bent, the inlet side of which lies in the feed plane, the bending guide of the material strip to form the subsequent flat material band section being released again when the exit side of the guide surface is reached, and a device for carrying it out.

Dabei ist unter einer im wesentlichen eckigen Querschnittsfläche eine von Geraden begrenzte Querschnittsfläche zu verstehen, die mittels Bögen ineinander übergehen, sodaß die Rohre gerundete Kantenbereiche aufweisen.An essentially angular cross-sectional area is to be understood as a cross-sectional area delimited by straight lines which merge into one another by means of arcs, so that the tubes have rounded edge regions.

Ein Verfahren und eine Vorrichtung dieser Art sind aus der US-A-2 339 219 bekannt. Dort ist ein Drehkäfig vorgesehen, der zu den Rohrwänden parallele Innenwandabschnitte aufweist. Während jedes Biegevorgangs liegt je nach Querschnittsform zumindest ein Innenwandabschnitt an einer Rohrwand an, über die aus dem Drehkäfig die Biegekräfte eingeleitet werden. Da die gekrümmte Leitfläche im Zentrum des Drehkäfigs liegt, erfolgt die Krafteinleitung grundsätzlich an einer dem Biegezentrum gegenüberliegenden Seite. Zur Unterstützung des Biegevorganges ist in einer Ausführung zusätzlich ein exzentrisch angelenkter Biegearm als Biegewerkzeug vorgesehen, der an dem zu biegenden Materialbandabschnitt außerhalb der Leitfläche an einem nicht unterstützten Bereich angreift, mit dem Drehkäfig mitgedreht und am Ende des Biegevorganges vom Drehkäfig gelöst und in die Ausgangslage zurückgeschwenkt wird, um den weiteren Vorschub nicht zu behindern. Da eine Biegeführung im Biegebereich entlang der Leitfläche nicht vorgesehen ist, sondern das Materialband jeweils frei gebogen wird, ist eine exakte, gleichmäßige Rundung der Kantenbereiche nicht möglich. Weiters muß für jede Querschnittsform und -größe ein eigener Drehkäfig verwendet werden.A method and an apparatus of this kind are known from US-A-2 339 219. A rotary cage is provided there, which has inner wall sections parallel to the tube walls. During each bending process, depending on the cross-sectional shape, at least one inner wall section bears against a pipe wall, via which the bending forces are introduced from the rotary cage. Since the curved guide surface lies in the center of the rotary cage, the force is generally applied on a side opposite the bending center. To support the bending process, an eccentrically articulated bending arm is additionally provided as a bending tool, which engages on an unsupported area on the material band section to be bent outside of the guide surface, rotated with the rotating cage and, at the end of the bending process, detached from the rotating cage and pivoted back into the starting position in order not to hinder the further feed. Since a bending guide is not provided in the bending area along the guide surface, but rather the material band is freely bent, an exact, uniform rounding of the edge areas is not possible. Furthermore, a separate rotating cage must be used for each cross-sectional shape and size.

In der DE-A-2 228 935 ist ein Verfahren beschrieben, nach, dem ein mit Falzrändern versehenes Blechband im Taktvorschub schräg in eine Biegestation eingebracht, mittels eines Niederhalters am Führungstisch fixiert und über die Tischkante mittels eines über dem Führungstisch angeordneten Biegewerkzeug abgekantet wird. Nach der Rückbewegung des Biegewerkzeuges in die Ausgangsstellung wird das Blechband um die nächste Vorschublänge . weitergeschoben und anschließend wieder fixiert und abgekantet.DE-A-2 228 935 describes a method according to which a sheet-metal band provided with folded edges is inserted obliquely into a bending station in the cycle feed, fixed to the guide table by means of a hold-down device and bent over the table edge by means of a bending tool arranged above the guide table. After the bending tool has moved back to the starting position, the metal strip is moved by the next feed length. pushed on and then fixed again and folded.

Wickelverfahren für Kantrohre, bei denen das Materialband um einen Kern gewickelt wird, sind aus den US-A-2 736 286, 2 440 792 und 2 640 451 bekannt. Die Verwendung eines Kernes ist insoferne ungünstig, als für jede gewünschte Querschnittsfläche ein eigener Kern und die Anpassung der an diesen drückenden Biege- und Verbindungseinrichtungen erforderlich ist.Winding method for square tubes in which the material strip is wrapped around a core are known from US-A - known 2,736,286, 2,440,792 and 2,640,451. The use of a core is disadvantageous insofar as a separate core and the adaptation of the bending and connecting devices pressing against it is required for each desired cross-sectional area.

Rohre mit rundem Querschnitt lassen sich aus verhältnismäßig schmalen Materialbändern großer Länge, die von Rollen abgezogen werden, in einem kontinuierlichen Arbeitsablauf um einen gedachten Kern schraubenförmig wickeln, sodaß die Rohre einen beliebigen Durchmesser aufweisen können. (AT-B-248 839 und 316 283).Tubes with a round cross-section can be wound from relatively narrow strips of material of great length, which are pulled off rolls, in a continuous workflow around an imaginary core, so that the tubes can have any diameter. (AT-B-248 839 and 316 283).

Gemäß der AT-B-316 283 erfolgt die Wicklung von Falznahtrohren mittels Rollenpaaren, die gleichzeitig auch die Falznaht schließen. Nach der AT-B-248 839 wird das Materialband durch eine Vielzahl von Hüben oder Schlägen eines Werkzeuges im Nahbereich eines Widerlagers frei gebogen. Dabei können auch unrunde Rohre hergestellt werden, wenn periodische Veränderungen der die Krümmung bewirkenden Kriterien erfolgen. Dieses Verfahren ist nur bei Schweißnahtrohren anwendbar, da die schlagende Bearbeitung bei gekanteten Falzrändern unmöglich ist.According to AT-B-316 283, the seam seam tubes are wound by means of pairs of rollers, which at the same time also close the seam seam. According to AT-B-248 839, the material strip is freely bent by a number of strokes or strokes of a tool in the vicinity of an abutment. Non-circular tubes can also be produced if periodic changes in the criteria causing the curvature occur. This procedure can only be used with welded seam pipes, since the striking machining is impossible with folded fold edges.

Die Erfindung hat es sich nun zur Aufgabe gestellt, ein Verfahren und eine Vorrichtung zur kontinuierlichen kernfreien Herstellung von Rohren mit im wesentlichen eckiger Querschnittsfläche zu finden, wobei eine exakte Biegeführung erreicht werden soll.The object of the invention is now to find a method and a device for the continuous core-free production of tubes with an essentially angular cross-sectional area, whereby an exact bending guidance is to be achieved.

Erfindungsgemäß wird diese Aufgabe nun dadurch gelöst, daß während des gesamten Abbiegevorganges die Biegekräfte radial zur Biegeachse eingebracht werden, wobei die Biegeachse die Krümmungsachse der Leitfläche darstellt.According to the invention, this object is now achieved in that the bending forces are introduced radially to the bending axis during the entire bending process, the bending axis representing the axis of curvature of the guide surface.

Das erfindungsgemäße Verfahren stellt somit ein von der Nahtausbildung unabhängiges, kontinuierliches Wickelverfahren dar. Es lassen sich ohne Unterbrechung des Bandvorschubes und unter Beibehaltung der Führung auch während des Biegevorganges eckige Rohre mit abgerundeten Kanten beliebiger Länge erzeugen, wobei durch Wahl der Bogenlänge und der Länge der flachen Abschnitte Rohre mit beliebiger konvexer Querschnittsfläche und beliebiger Eckenanzahl herstellbar sind.The process according to the invention thus represents a continuous winding process which is independent of the seam formation. It is possible to produce angular pipes with rounded edges of any length without interrupting the tape feed and while maintaining the guidance even during the bending process, with the choice of the arc length and the length of the flat ones Sections of pipes with any convex cross-sectional area and any number of corners can be produced.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens mit einem Führungstisch für das einlaufende Materialband, einem im Kantenbereich des sich bildenden Rohres angeordneten Stab, der sich mit einem der Materialbanddicke entsprechenden Abstand oberhalb des Führungstisches über zumindest zwei Wicklungen des Rohres erstreckt und mit einer konvex gekrümmten Leitfläche versehen ist, mit einem Biegewerkzeug, das um eine zur Auflageebene des Führungstisches parallele Achse verschwenkbar ist und am Ende des Biegevorganges unter Freigabe des Materialbandvorschubes in die Ausgangslage zurückbewegt wird, ist dadurch gekennzeichnet, daß das Biegewerkzeug durch eine ebene in den Führungstisch eingesetzte Biegeplatte gebildet ist, deren das Materialband führende Oberseite während des Biegevorganges aus der Auflageebene hochschwenkend an der Leitfläche abrollt, wobei die Schwenkachse in der Krümmungsachse der Leitfläche liegt, und am Ende des Biegevorganges um eine zur Schwenkachse parallele Achse von der Leitfläche weg in die Auflageebene niederklappt und sich schließlich in die Ausgangslage zurückbewegt.A device for carrying out the method according to the invention with a guide table for the incoming material strip, a rod arranged in the edge region of the tube that forms, which extends at a distance corresponding to the material strip thickness above the guide table over at least two windings of the tube and is provided with a convexly curved guide surface is, with a bending tool that is pivotable about an axis parallel to the support plane of the guide table and at the end of the bending process with release of the material feed into the starting position is moved back, characterized in that the bending tool is formed by a flat bending plate inserted into the guide table, the upper side of which the material band guides during the bending process, swivels upward from the support plane on the guide surface, the pivot axis being in the axis of curvature of the guide surface, and on End of the bending process about an axis parallel to the pivot axis from the guide surface in the support plane and finally moves back to the starting position.

Das in den Spalt zwischen dem Stab und der Auflageebene des Führungstisches einlaufende Materialband wird unter Berücksichtigung des Winkels zwischen der Einlaufrichtung und der Rohrlängsrichtung um das Ausmaß der gewünschten Seitenlänge der Querschnittsfläche des herzustellenden Rohres abzüglich eines doppelten Bogenanteils auf dem Führungstisch vorgeschoben, und anschließend die Biegeplatte aus der Auflageebene hochgeschwenkt. Dabei wird das kontinuierlich weiterlaufende Blechband zentripetal an der Leitfläche des Stabes geführt und entsprechend gebogen. Sobald nun die dem gewünschten Innenwinkel zwischen den beiden Seitenflächen des entstehenden Rohres entsprechende Bogenlänge erreicht ist, wird zwischen der Biegeplatte, die während des Biegevorganges sich um die Krümmungsachse der Leitfläche dreht, und dem Führungstisch eine axiale Verriegelung geschaffen. Die Biegeplatte wird um die entstandene tischfeste, zur Krümmungsachse parallele Achse in den Führungstisch niedergeklappt. Diese tischfeste Achse entsteht dabei in bezug auf den Spalt zwischen dem Stab und dem Führungstisch dem einlaufenden Materialband gegenüber, sodaß die Oberseite der Biegeplatte bei der Klappbewegung von dem an der Leitfläche geführten Materialband abhebt und den kontinuierlichen weiteren Vorschub des Materialbandes nicht behindert, wobei der soeben hochgebogene Seitenwandteil des entstehenden Rohres sich mitverschiebt. Während des Vorschubs des nächsten, einer zweiten Seite der Querschnittsfläche entsprechenden Abschnitts des Materialbandes kehrt die Biegeplatte in ihre Ausgangsstellung zurück, nachdem die axiale Verriegelung gelöst worden ist. Damit kann der nächste Biegevorgang eingeleitet werden. Die Oberseite der ebenen Biegeplatte verdreht sich, um die zentripetale Führung zu erzielen, während des Biegevorganges ständig parallel zu einer Tangentialebene der Leitfläche. Eine bevorzugte Ausführung sieht dabei vor, daß die Biegeplatte mindestens einen Lagerzapfen aufweist, der in einen parallel zur Leitfläche des Stabes verlaufenden Führungsschlitz eingreift, und in der Biegeendstellung unter Bildung der zur Krümmungsachse parellelen, tischfesten Achse arretierbar ist, wobei an der Biegeplatte zumindest ein gesteuerter Betätigungshebel angelenkt ist. Für die Bewegung des Betätigungshebels ist insbesondere eine Steuernocke vorgesehen, deren Antrieb mit dem Vorschub des Materialbandes koordiniert ist.The material strip entering the gap between the rod and the support plane of the guide table is fed into the guide table, taking into account the angle between the direction of entry and the longitudinal direction of the pipe, by the extent of the desired side length of the cross-sectional area of the pipe to be produced, minus a double arc portion, and then the bending plate the support level swung up. The continuous sheet metal strip is guided centripetally on the guide surface of the rod and bent accordingly. As soon as the arc length corresponding to the desired internal angle between the two side surfaces of the resulting tube is reached, an axial locking is created between the bending plate, which rotates about the axis of curvature of the guide surface during the bending process, and the guide table. The bending plate is folded down into the guide table around the table-fixed axis that is parallel to the axis of curvature. This tischfes t e axis formed thereby with respect to the gap between the rod and the guide table the incoming strip of material over so that the upper surface of the bending plate in the folding movement of the guided on the guide surface material web lifts off and does not hinder the continuous further advance of the tape, wherein the side wall part of the pipe that has just been bent also moves. During the advance of the next section of the material strip corresponding to a second side of the cross-sectional area, the bending plate returns to its starting position after the axial locking has been released. The next bending process can then be initiated. The top of the flat bending plate twists to achieve the centripetal guidance during the bending process, always parallel to a tangential plane of the guide surface. A preferred embodiment provides that the bending plate has at least one bearing pin which engages in a guide slot running parallel to the guide surface of the rod, and can be locked in the bending end position to form the table-fixed axis parallel to the axis of curvature, at least one controlled one on the bending plate Actuating lever is articulated. A control cam, the drive of which is coordinated with the feed of the material strip, is provided in particular for the movement of the actuating lever.

Zur Schaffung der tischfesten Achse durch axiale Verriegelung des Lagerzapfen dient bevorzugt ein federbelasteter Rasthebel, der bei Abschluß des Biegeyorganges am Lagerzapfen verrastet, wobei ein Lösefortsatz am Rasthebel vorgesehen ist, den die nieder klappende Biegeplatte am Ende der Rückklappbewegung beaufschlagt. Sobald die Oberseite der Biegeplatte mit der Auflageebene des Führungstisches fluchtet, wird damit der Lagerzapfen freigegeben und die axiale Verriegelung gelöst, worauf vorzugsweise durch eine Rückstellfeder die Biegeplatte in die Ausgangsstellung zurückkehrt.To create the table-fixed axis by axially locking the bearing pin, a spring-loaded locking lever is preferably used, which locks at the end of the bending operation on the bearing pin, a release extension being provided on the locking lever, which the folding plate which folds down acts upon the end of the folding-back movement. As soon as the top of the bending plate is aligned with the support plane of the guide table, the bearing journal is thus released and the axial locking is released, whereupon the bending plate preferably returns to the starting position by means of a return spring.

Die im allgemeinen mit einem Schließ- oder Schweißrollenpaar ausgestattete Einrichtung zur Verbindung der Materialbandlängsränder durch Wickeln des Rohres kann an sich an jeder beliebigen Stelle vorgesehen werden. Günstig ist deren Anordnung an der engsten Stelle des Spaltes zwischen dem die Leitfläche aufweisenden Stab und dem Führungstisch bzw. der noch in diesen Bereich eingreifenden Biegeplatte, da dort keine Ortsveränderung des Rollenpaares erforderlich ist. Hiezu ist in einer Ausführung vorgesehen, daß der Stab hohlzylindrisch ist, und darin die in bezug auf das zu bildende Rohr innere Verbindungsrolle parallel zur Vorschubrichtung angeordnet ist. Da im allgemeinen deren Antrieb erforderlich ist, ist sie auf einer Welle befestigt, die sich schräg in den hohlzylindrischen Stab erstreckt. Im führungstischnächsten Bereich, also an der engsten Stelle des Spaltes, ist im hohlzylindrischen Stab ein Durchtrittsschlitz für die innere Verbindungsrolle vorgesehen, durch den sie die zu verbindenden Materialbandränder kontaktiert. Die äußere Gegenrolle ist im Führungstisch angeordnet.The device, which is generally equipped with a pair of closing or welding rollers, for connecting the longitudinal edges of the material strip by winding the tube, can in itself be provided at any point. It is favorable to arrange them at the narrowest point of the gap between the rod having the guide surface and the guide table or the bending plate still engaging in this area, since there is no need to change the location of the pair of rollers. For this purpose, it is provided in one embodiment that the rod is hollow cylindrical, and in it the inner connecting roller with respect to the tube to be formed is arranged parallel to the feed direction. Since their drive is generally required, it is attached to a shaft which extends obliquely into the hollow cylindrical rod. In the area closest to the guide table, that is to say at the narrowest point of the gap, a passage slot is provided in the hollow cylindrical rod for the inner connecting roller, through which it contacts the edges of the material strip to be connected. The outer counter roller is arranged in the guide table.

Während des Biegevorganges wird das sich bildende Rohr von der Biegeplatte hochgeschwenkt. Dabei ist es vor allem für Rohre mit größerer Querschnittsfläche günstig, ab Überschreitung der labilen Gleichgewichtslage eine gegenüberliegende Stütze vorzusehen, auf der das Rohr bis zum Abschluß des Biegevorganges aufliegt. Es ist daher in einer weiteren bevorzugten Ausführung gegengleich zur Biegeplatte eine Stützplatte ausgebildet, die ebenfalls an der Leitfläche zentripetal geführt ist. Zu Beginn des Biegevorganges wird die im Führungstisch angeordnete Stützplatte, die gegenüber der Biegeplatte in Längsrichtung des Rohres zumindest um die Breite des einlaufenden Materialbandes versetzt ist, ebenfalls hochgeschwenkt und kehrt nach Übernahme des sich bildenden Rohres wieder direkt in die Ausgangslage zurück. Da der Bewegungsablauf dem der Biegeplatte ähnlich ist, kann auch dessen Steuerung ähnlich erfolgen, wozu vorzugsweise wiederum mindestens ein Betätigungshebel und eine Steuernocke vorgesehen sind. Werden als Steuernocken Nockenscheiben vorgesehen, so sind diese vorzugsweise je einen am Betätigungshebel angelenkten Zwischenhebel zugeordnet. Eine andere Möglichkeit sieht vor, daß als Nockensteuerung jeweils ein sich radial von der Antriebswelle erstreckender Arm vorgesehen ist, an dessen freien Ende ein Mitnehmerzapfen angeordnet ist, und daß am freien Ende jedes Betätigungshebels eine Rastnut vorgesehen ist, in die der Mitnehmerzapfen über einen Winkelbereich seiner Drehbewegung eingreift.During the bending process, the tube that forms is swung up from the bending plate. It is particularly advantageous for pipes with a larger cross-sectional area to provide an opposite support when the unstable equilibrium position is exceeded, on which the pipe rests until the bending process is completed. In a further preferred embodiment, therefore, a support plate is formed opposite to the bending plate, which is also guided centripetal on the guide surface. At the beginning of the bending process, the support plate arranged in the guide table, which is offset in relation to the bending plate in the longitudinal direction of the tube by at least the width of the incoming material strip, is also pivoted up and returns directly to the starting position after taking over the forming tube. Since the sequence of movements is similar to that of the bending plate, it can also be controlled in a similar manner, for which purpose preferably at least one actuating lever and one control cam are provided. If cam disks are provided as control cams, these are preferably each associated with an intermediate lever articulated on the actuating lever. Another possibility provides that a radially extending arm is provided as the cam control, at the free end of which a driver pin is arranged, and that at the free end of each actuating lever there is a latching groove into which the driver pin over an angular range of its Engages rotary motion.

Vorteilhaft werden beide Steuernocken auf derselben Antriebswelle angeordnet, deren Drehung wie erwähnt, mit dem Vorschub des Materialbandes koordiniert ist.Both control cams are advantageously arranged on the same drive shaft, the rotation of which, as mentioned, is coordinated with the feed of the material strip.

Für die Erzeugung langer Rohrstücke empfiehlt sich eine weitere Stützeinrichtung für das Rohr, die jeweils aus einem Plattenpaar besteht, das der Biegeplatte und der Stützplatte entsprechend synchron bewegbar und mit Abstand dazu angeordnet ist.For the production of long pieces of pipe, a further support device for the pipe is recommended, each of which consists of a pair of plates that can be moved synchronously with the bending plate and the support plate and is arranged at a distance from it.

Nachstehend wird nun die Erfindung anhand der Figuren der beiliegenden Zeichnungen näher beschrieben, ohne darauf beschränkt zu sein.The invention will now be described in more detail below with reference to the figures in the accompanying drawings, without being limited thereto.

Die Fig. 1 - 8 zeigen den Bewegungsablauf während eines Biegevorganges mittels einer ersten Ausführung der Vorrichtung bei der Wicklung eines Vierkantrohres mit im wesentlichen rechteckiger Querschnittfläche,

  • Fig. 9 einen Vertikalschnitt durch die erste Ausführung der Vorrichtung nach der IX - IX der Fig. 10,
  • die Fig. 10 einen Horizontalschnitt gemäß der Linie X - X in Fig. 9,
  • Fig. 11 einen Schnitt gemäß Fig. 10 mit hochgeschwenkter Biegeplatte und
  • die Figur 12 - 17 den Bewegungsablauf während eines Biegevorganges mittels einer zweiten Ausführung der Vorrichtung.
1-8 show the sequence of movements during a bending process by means of a first embodiment of the device in the winding of a square tube with an essentially rectangular cross-sectional area,
  • 9 is a vertical section through the first embodiment of the device according to IX - IX of FIG. 10,
  • 10 is a horizontal section along the line X - X in Fig. 9,
  • FIG. 11 shows a section according to FIG. 10 with the bending plate swung up and
  • FIGS. 12-17 show the sequence of movements during a bending process by means of a second embodiment of the device.

Das im Bewegungsablauf in den Fig. 1 bis 8 dargestellte Verfahren läßt sich beispielsweise mit einer Vorrichtung gemäß den Fig. 9 bis 11 realisieren. Auf einem Vorrichtungsgestell ist ein Führungstisch 9 sowie eine Anzahl von vertikal angeordneten plattenförmigen Stützen 27 vorgesehen. Oberhalb der Tischebene A erstreckt sich unter Belassung eines der Dicke des zu verarbeitenden Materialbandes 1 entsprechenden Spaltes zur Tischebene A in Längsrichtung des zu wickelnden Rohres 12 (Fig. 1 bis 8) ein Stützelement in Form eines hohlzylindrischen Stabes 2, der eine Länge aufweist, die zumindest zwei, vorzugsweise drei bis vier Wicklungen des Rohres 12 umfaßt. Unterhalb des hohlzylindrischen Stabes 2 ist im Führungstisch 9 im Bereich des einlaufenden Materialbandes 1 eine schwenkbare Biegeplatte 4 angeordnet, deren Länge etwa der des Stabes 2 entspricht. Die Oberseite der Biegeplatte 4 liegt dabei in der Tischebene A, und an der Unterseite der Biegeplatte 4 sind zwei Leisten 29 angeordnet, die sich senkrecht zur Längsrichtung des zu wickelnden Rohres 12 erstrecken. Die Biegeplatte erstreckt sich dabei, beginnend von einer vertikalen Axialebene durch den hohlzylindrischen Stab 2, auf die in bezug auf den Stab 2 entgegengesetzte Seite des einlaufenden Materialbandes 1. Die nach unten gerichtete Mantelhälfte des hohlzylindrischen Stabes 2 bildet eine konvex gebogene Leitfläche 3, entlang der das einlaufende Materialband 1 mit Hilfe der Biegeplatte 4 gebogen werden kann. Die Eintrittsseite der Leitfläche 3 für die Biegung des Materialbandes 1 liegt dabei in der vertikalen Axialebene durch den hohlzylindrischen Stab 2, also an der engsten Stelle des Spaltes zwischen dem Stab 2 und der Tischebene A, und die Austrittsseite entsprechend dem zu biegenden Innenwinkel um das dazugehörige Bogenmaß verlegt. Die Biegeplatte 4 wird bei der Schwenkbewegung aus der Tischebene A nach oben einserseits in kreisbogenförmigen Führungsschlitzen 11 in den plattenförmigen Stützen 27 durch einen seitlich aus den Leisten 29 vorstehenden Lagerzapfen 20 geführt, wobei an Stelle des gezeigten durchgehenden Lagerzapfens 20 auch zwei jeweils nur die Leisten 29 geringfügig überragende Lagerzapfen vorgesehen sein können, und andererseits über Betätigungshebel 5 bewegt, die an den Leisten 29 angelenkt sind. Die vorherrschende Bewegungsrichtung der Betätigungshebel verläuft dabei etwa vertikal nach oben, wobei die Oberseite der Biegeplatte 4 (selbstverständlich unter Zwischenlage des zu bewegenden Materialbandes 1) an der Leitfläche 3 abrollt und das bei alle Tangentialebenen an die Leitfläche 3 zwischen der in Fig. 9 mit ausgezogenen Linien gezeigten Ausgangsstellung in der Tischebene A und der Endbiegestellung, die für einen 90- gradigen Biegewinkel strichliert gezeigt ist, durchläuft. Die Bewegung der Biegeplatte 4 stellt somit eine Drehung um die Achse des hohlzylindrischen Stabes 2 dar, wobei sie fortlaufend zentripetal an die Leitfläche 3 gedrückt wird. Da die Schwenkgeschwindigkeit der Biegeplatte 4 vorzugsweise mit der Vorschubgeschwindigkeit des kontinuierlich einlaufenden Materialbandes 1 koordiniert ist, findet nur eine geringfügige Relativbewegung zwischen dem sich biegenden Materialband und der Biegeplatte statt, die nur auf den schrägen Einlaufwinkel des Materialbandes zurückzuführen ist.1 to 8 can be implemented, for example, with a device according to FIGS. 9 to 11. A guide table 9 and a number of vertically arranged plate-shaped supports 27 are provided on a device frame. Above the table plane A, leaving a gap corresponding to the thickness of the material strip 1 to be processed, to the table plane A in the longitudinal direction of the tube 12 to be wound (FIGS. 1 to 8), a support element in the form of a hollow cylindrical rod 2, which has a length that comprises at least two, preferably three to four windings of the tube 12. Below the hollow cylindrical rod 2, a swiveling bending plate 4 is arranged in the guide table 9 in the area of the incoming material strip 1, the length of which is approximately the same as that of the rod 2. The top of the bending plate 4 lies in the table plane A, and two strips 29 are arranged on the underside of the bending plate 4, which extend perpendicular to the longitudinal direction of the tube 12 to be wound. The bending plate extends, starting from a vertical axial plane through the hollow cylindrical rod 2, to the opposite side of the incoming material strip 1 with respect to the rod 2. The downward-facing jacket half of the hollow cylindrical rod 2 forms a convexly curved guide surface 3 along which the incoming material strip 1 can be bent using the bending plate 4. The entry side of the guide surface 3 for the bending of the material strip 1 lies in the vertical axial plane through the hollow cylindrical rod 2, that is to say at the narrowest point of the gap between the rod 2 and the table plane A, and the exit side corresponding to the inner angle to be bent Radians laid. The bending plate 4 is guided during the pivoting movement from the table plane A upwards in circular arc-shaped guide slots 11 in the plate-shaped supports 27 through a journal 20 protruding laterally from the strips 29, with two instead of the strips 29 being used instead of the continuous journal 20 shown slightly superior bearing pins can be provided, and on the other hand moved via actuating levers 5 which are articulated on the strips 29. The predominant direction of movement of the actuating levers extends approximately vertically upwards, the upper side of the bending plate 4 (naturally with the interposition of the material strip 1 to be moved) rolling on the guide surface 3, and this at all tangential planes to the guide surface 3 between those drawn out in FIG. 9 Lines shown starting position in table level A and the end bending position, which is shown in dashed lines for a 90 degree bending angle, passes through. The movement of the bending plate 4 thus represents a rotation about the axis of the hollow cylindrical rod 2, wherein it is continuously pressed centripetal against the guide surface 3. Since the pivoting speed of the bending plate 4 is preferably coordinated with the feed speed of the continuously incoming material strip 1, there is only a slight relative movement between the bending material strip and the bending plate, which can only be attributed to the inclined entry angle of the material strip.

Gegengleich zur Biegeplatte, also auf der Einlaufseite des Stabes 2 ist eine Stützplatte 21 vorgesehen, die in Rohrlängsrichtung gegenüber der Biegeplatte 4 versetzt ist.Opposite to the bending plate, that is to say on the inlet side of the rod 2, a support plate 21 is provided, which is offset in the longitudinal direction of the pipe relative to the bending plate 4.

Die Stützplatte 21, die ebenfalls aus der TischebeneA hochschwenkbar ist, dient dazu, den bereits erzeugten Rohrabschnitt während jedes Biegevorganges bei Überschreiten der labilen Gleichgewichtslage zu übernehmen und ihn entsprechend der weiteren Kippung durch die in die Biegeendstellung hochschwenkende Biegeplatte 4 bis zur Wiederauf tage auf der Tischebene A zu unterstützen. Die Stützplatte 21 ist hiezu im wesentlichen symmetrisch zur Biegeplatte 4 ausgebildet und angeordnet, d. h. sie weist an ihrer Unterseite zumindest eine Leiste 30 auf, aus der beidseitig ein Lagerzapfen 22 vorsteht, der in kreisbogenförmigen Führungsschlitzen 23 weiterer plattenförmiger Stützen 27 verschiebbar ist. Die Oberseite dieser Stützplatte 21 rollt während der Verschwenkung ebenfalls an der Leitfläche 3 des Stabes ab (selbstverständlich ebenfalls an der Außenseite fertiggestellter Rohrwicklungen, die dabei zentripetal geführt werden), wobei an der bzw. den Leisten 30 der Stützplatte 21 zumindest ein Betätigungshebel 25 angelenkt ist.The support plate 21, which can also be swiveled up from the table plane A, serves to take over the tube section already generated during each bending process when the unstable equilibrium position is exceeded and to correspondingly tilt it further by the bending plate 4 swiveling into the bending end position until the rest of the day on the table plane A support. The support plate 21 is designed and arranged essentially symmetrically to the bending plate 4, ie it has on its underside at least one ledge 30 from which a bearing pin 22 protrudes on both sides and can be displaced in arcuate guide slots 23 of further plate-shaped supports 27. The top of this support plate 21 also rolls off on the guide surface 3 of the rod during the pivoting (of course also on the outside of finished tube windings which are guided centripetal), at least one actuating lever 25 being articulated on the strip (s) 30 of the support plate 21 .

Der Bewegungsablauf der Biegeplatte 4 und der Stützplatte 21 wird von einer Nockensteuerung gesteuert. Gemäß den Figuren 1 bis 9 sind in einer ersten Ausführung auf einer Antriebswelle 8 zwei Nockenscheiben 7, 24 angeordnet, entlang deren Steuerkurven an je einem Zwischenhebel 6, 26 angeordnete Rollen 18,19 bei der Drehung abrollen. Der Zwischenhebel 6 ist am Betätigungshebel 5 der Biegeplatte 4 und der Zwischenhebel 26 am Betätigungshebel 25 der Stützplatte 21 angelenkt. Die Steuerkurven der beiden Nockenscheiben 7, 24 sind unterschiedlich ausgebildet.The movement sequence of the bending plate 4 and the support plate 21 is controlled by a cam control. According to FIGS. 1 to 9, in a first embodiment, two cam disks 7, 24 are arranged on a drive shaft 8, along the control curves of which rollers 18, 19 arranged on an intermediate lever 6, 26 each roll during rotation. The intermediate lever 6 is articulated on the actuating lever 5 of the bending plate 4 and the intermediate lever 26 on the actuating lever 25 of the support plate 21. The control curves of the two cam disks 7, 24 are designed differently.

Gemäß der in den Figuren 12 bis 17 gezeigten weiteren Ausführung wird die Steuerung der Betätigungshebel 5, 25 nicht von Nockenscheiben bewerkstelligt. An deren Stelle treten radial von der Antriebswelle 8 abstehende Arme 31, 32, die endseitige Mitnehmerzapfen 33, 34 aufweisen. Diese werden im Laufe der Drehung über Winkelbereiche Rastnuten zugeordnet, die an den Enden der Betätigungshebel 5, 25 vorgesehen sind. Die Antriebswelle 8 der beiden diametral einander gegenüberliegenden Arme 31, 32 ist beispielsweise über eine Magnetkupplung mit dem Hauptantrieb verbindbar.According to the further embodiment shown in FIGS. 12 to 17, the control of the actuating levers 5, 25 is not accomplished by cam disks. In their place, arms 31, 32 protrude radially from the drive shaft 8 and have driver pins 33, 34 at the end. These are assigned locking grooves in the course of the rotation over angular ranges, which are provided at the ends of the actuating levers 5, 25. The drive shaft 8 of the two diametrically opposite arms 31, 32 can be connected to the main drive, for example, via a magnetic coupling.

An der Antriebswelle 8 ist weiters eine Scheibe befestigt an deren Umfang eine die Ruhestellung definierende Kerbe 37 ausgebildet ist. In die Kerbe 37 greift ein von einem ersten Preßluftzylinder 42 beaufschlagter Rasthebel 38 ein. Ein zweiter Preßluftzylinder 43 trägt einen Stößel 39 für die Beaufschlagung des Betätigungshebels 5. Dem Betätigungshebel 25 sind zwei weitere Preßluftzylinder 44, 45 zugeordnet, die Stößel 40, 41 bewegen, wobei der Stößel 41 zur Verrastung an einer Nase 46 vorgesehen ist, die vom freien Ende des Betätigungshebels 25 nach außen absteht. Weiters ist eine nur schematisch dargestellte Rückholfeder 47 zwischen dem Vorrichtungsgestell und dem Betätigungshebel 25 vorgesehen, wobei im Rückholweg des Betätigungshebels 25 ein nicht gezeigter Anschlag liegt.Furthermore, a disk is fastened to the drive shaft 8, on the circumference of which a notch 37 defining the rest position is formed. A notch 37 engages with a locking lever 38 acted upon by a first compressed air cylinder 42. A second compressed air cylinder 43 carries a plunger 39 for the actuation of the actuating lever 5. The actuating lever 25 is assigned two further compressed air cylinders 44, 45 which move the plunger 40, 41, the plunger 41 being provided for latching on a nose 46 which is open End of the operating lever 25 protrudes outwards. Furthermore, a return spring 47, shown only schematically, is provided between the device frame and the actuating lever 25, a stop (not shown) being located in the return path of the actuating lever 25.

Anhand der Figuren 1 bis 8 wird nunmehr das Verfahren zur Herstellung der Rohre 12 näher beschrieben. Fig. 1 zeigt dabei bereits zumindest eine Wicklung des Rohres 12. Das Materialband 1 läuft, in den Darstellungen jeweils von rechts, auf dem Führungstisch 9 in die Vorrichtung ein. Gemäß Fig. 1 und 2 verschiebt sich dabei der bereits fertiggestellte Teil des Rohres 12 ungehindert nach links, wobei die Biegeplatte 4 und die Stützplatte 21 im Führungstisch 9 versenkt sind. Nach der entsprechenden Vorschublänge legt sich der in der Zeichnung rechte untere, gerundete Kantenbereich des Rohres 12 an die rechte Hälfte der Leitfläche 3 des Stabes 2 an. Da der Vorschub des Materialbandes 1 nicht unterbrochen wird, muß sich der bereits fertiggestellte Teil des Rohres 12 hochdrehen (Fig. 3 - 6), wobei über die Nockensteuerung die Biegeplatte 4 hochgeschwenkt und das Materialband 1 zentripetal um den Stab entlang der linken Hälfte der Leitfläche 3 geführt wird, sodaß eine Verformung des Rohres verhindert wird und eine exakte Biegung des Materialbandes 1 erfolgt. Wie aus den Fig. 3 und 4 ersichtlich, schwenkt gleichzeitig mit der Biegeplatte 4 auch die Stützplatte 21, die wie erwähnt in Längsrichtung des Rohres 12 versetzt ist, aus dem Führungstisch 9 hoch und legt sich (Fig. 4) an das Rohr 12 an. Damit ist der Wendepunkt der Schwenkbewegung der Stützplatte 21 erreicht, die gesteuert über die Nockenscheibe 24 und die beiden Betätigungshebel 26, 25 wieder nach unten in den Führungstisch 9 geschwenkt, wobei sie (Fig. 5) bei Überschreiten der labilen Gleichgewichtslage des Rohres 12 dieses stützt, während die Biegeplatte 4 bis zum Abschluß des Biegevorganges (Fig. 6) weiter hochgeschwenkt wird. Die Lagerzapfen 20, 22 der Biegeplatte 4 und der Stützplatte 21 bewegen sich dabei in den Führungsschlitzen 11 und 23, wobei die Bogenlänge des Führungsschlitzes 23 für die Stützplatte 21 kürzer ist als die des Führungsschlitzes 11 für die Biegeplatte 4. Sobald nun die Biegeendstellung gemäß Fig. 6 erreicht ist, wird der Lagerzapfen 20 fixiert, wodurch sich eine tischfeste Achse 10 bildet (Fig. 7, 9). Dies wird durch einen federbeaufschlagten Rasthebel 13 (Fig. 9, 11) erreicht, der unterhalb der Biegeplatte 4 um eine Achse 28 schwenkbar ist, und eine Rastnase aufweist, die bei Erreichen der Biegeendstellung am Lagerzapfen 20 verrastet. Die Nockenscheibe 7 weist eine etwa radial abfallende Abschlußflanke auf, sodaß der Betätigungshebel 6 unmittelbar nach unten fallen kann, wobei sich die Biegeplatte 4 um die tischfeste Achse 10 dreht. Die Biegeplatte 4 hebt damit sehr rasch, nämlich mit einer Geschwindigkeit, die zumindest der Vorschubgeschwindigkeit des Materialbandes entspricht, seitlich von der Leitfläche 3 bzw. dem hochgebogenen Materialband ab, wodurch letztlich auch aufgrund des gerundeten Kantenbereiches der kontinuierliche Vorschub des Materialbandes 1 nicht behindert wird (Fig. 8). Die Nockenscheiben 7, 24 drehen noch in die Ausgangsstellung zurück, und werden erst zu Beginn des nächsten Abbiegevorganges wieder in Drehung versetzt.The method for producing the tubes 12 will now be described in more detail with reference to FIGS. 1 to 8. 1 already shows at least one winding of the tube 12. The material strip 1 runs, from the right in each case, on the guide table 9 into the device. 1 and 2, the already completed part of the tube 12 moves freely to the left, the bending plate 4 and the support plate 21 being sunk in the guide table 9. After the corresponding feed length, the lower right, rounded edge region of the tube 12 in the drawing bears against the right half of the guide surface 3 of the rod 2. Since the feed of the material strip 1 is not interrupted, the part of the tube 12 which has already been completed must rotate upward (FIGS. 3 - 6), the bending plate 4 being pivoted upward via the cam control and the material strip 1 centripetal around the rod along the left half of the guide surface 3 is guided so that a deformation of the tube is prevented and an exact bending of the material strip 1 takes place. As can be seen from FIGS. 3 and 4, at the same time as the bending plate 4, the support plate 21, which, as mentioned, is offset in the longitudinal direction of the tube 12, swings up out of the guide table 9 and lies against the tube 12 (FIG. 4) . Thus, the turning point of the pivoting movement of the support plate 21 is reached, which is pivoted back down into the guide table 9 in a controlled manner via the cam disk 24 and the two actuating levers 26, 25, whereby it (FIG. 5) supports this when the unstable equilibrium position of the tube 12 is exceeded , while the bending plate 4 is pivoted further until the end of the bending process (Fig. 6). The journals 20, 22 of the bending plate 4 and the support plate 21 move in the guide slots 11 and 23, the arc length of the guide slot 23 for the support plate 21 being shorter than that of the guide slot 11 for the bending plate 4. As soon as the bending end position according to FIG 6 is reached, the bearing pin 20 is fixed, whereby a table-fixed axis 10 is formed (Fig. 7, 9). This is achieved by a spring-loaded locking lever 13 (FIGS. 9, 11) which can be pivoted about an axis 28 below the bending plate 4 and has a locking lug which locks on the bearing pin 20 when the bending end position is reached. The cam disk 7 has an approximately radially sloping end flank, so that the actuating lever 6 can drop directly downwards, the bending plate 4 rotating about the table-fixed axis 10. The bending plate 4 thus lifts very quickly, namely at a speed that at least corresponds to the feed speed of the material strip, laterally from the guide surface 3 or the bent material strip, which ultimately also prevents the continuous feed of the material strip 1 due to the rounded edge region ( Fig. 8). The cam disks 7, 24 still rotate back into the starting position and are only set in rotation again at the beginning of the next turning process.

Der Rasthebel 13 weist einen Lösefortsatz 14 auf, der von der niederschwenkenden Biegeplatte 4 im letzten Teil des Schwenkweges beaufschlagt wird. Der Rasthebel 13 wird damit nach unten gedrückt, und gibt den Lagerzapfen 20 wieder frei, womit die tischfeste Achse 10 wieder entfernt ist. Die in den Führungstisch zurückgeschwenkte Biegeplatte 4 kann während des weiteren Vorschubs des Materialbandes 1 in die Ausgangsstellung zurückkehren, wozu nicht dargestellte Rückstelleinrichtungen dienen.The detent lever 13 has a release extension 14, which of the swiveling down Bending plate 4 is applied in the last part of the swivel path. The locking lever 13 is thus pressed down and releases the bearing pin 20 again, whereby the table-fixed axis 10 is removed again. The bending plate 4 pivoted back into the guide table can return to the starting position during the further advance of the material strip 1, for which purpose reset devices (not shown) are used.

Um auch längere Rohre 12 störungsfrei wickeln zu können, ist ein in gleicher Weise angeordnetes und gesteuertes Plattenpaar zumindest am Ende des Rohres vorgesehen, das sich mit dem Rohr in Längsrichtung mitbewegt, wobei hier anstelle der Biegeplatte 4 funktionell eine zweite Stützplatte vorgesehen ist.In order to be able to wind even longer tubes 12 without problems, a pair of plates arranged and controlled in the same way is provided at least at the end of the tube, which moves with the tube in the longitudinal direction, with a second support plate being provided here instead of the bending plate 4.

Nach der in der Figur 12 bis 17 gezeigten Vorrichtung erfolgt die Steuerung der Betätigungshebel 5, 25 in folgender Weise:According to the device shown in FIGS. 12 to 17, the actuation levers 5, 25 are controlled in the following way:

Aus der in Fig. 12 gezeigten Ruhestellung wird der Biegevorgang durch einen elektrischen Impuls ausgelöst. Dieser betätigt die erwähnte Magnetkupplung der Antriebswelle 8 und die beiden Preßluftzylinder 42 und 45. Die Antriebswelle 8 wird über die Magnetkupplung über eine Vorgelegewelle eines Kettentriebes mit dem Hauptantrieb verbunden, wobei eine wählbare Übersetzung die die Drehgeschwindigkeit der Antriebswelle 8 der Vorschubgeschwindigkeit des Materialbandes 1 anpaßt. Der Raststößel 38 des Preßluftzylinders 42 wird aus der Kerbe 37 zurückgezogen und gibt die Drehbewegung der auf der Antriebswelle 8 angeordneten Arme 31, 32 fei. Die Betätigung des Preßluftzylinders 45 zieht den an Nase 46 verrasteten Stößel 41 ein, sodaß der Betätigungshebel 25 unter der Wirkung der Feder 47 in diese in Fig. 13 gezeigte Stellung hochgezogen wird, sodaß die Stützplatte 21 um 45 Grad in die Auffangstellung schwenkt. Der Mitnehmerzapfen 33 des ersten Armes 31 greift in der Ruhestellung (Fig. 12) in die Rastnut des Betätigungshebels 5 ein. Die beginnende Drehung der Arme 31, 32 bewirkt nun die Einleitung des Drehvorganges, da über den Betätigungshebel 5 die Biegeplatte 4 hochgeschwenkt wird. In der in Fig. 14 gezeigten Zwischenstellung erstrecken sich die beiden Arme 31, 32 horizontal und die Biegeplatte 4 ist um 45 Grad hochgeschwenkt, sodaß sie mit der Stützplatte 21 einen rechten Winkel einschließt. Der Anschlag für den federbeaufschlagten Betätigungshebel 25 der Stützplatte 21 ist dabei so angeordnet, daß die Rastnut des Betätigungshebels 25 in der Höhe der Antriebswelle 8 liegt, sodaß in der Zwischenstellung nach Fig. 14 der Mitnehmerzapfen 34 des Armes 32 in die Rastnut einschnappt. Bei der Weiterdrehung in die in Fig. 15 gezeigte Position werden nun beide Betätigungshebel 5, 25 von den Armen 31, 32 zwangsgeführt, sodaß die Biegeplatte 4 weiter hochschwenkt und die Stützplatte 21, die zunehmend das Gewicht des sich formenden Rohres aufnimmt, in die Tischebene zurückklappt. Der Biegevorgang ist in der Stellung nach Fig. 15 beendet, wobei der Rasthebel 13 den Lagerzapfen 20 in der Achse 10 verriegelt. In dieser Stellung wird einerseits der Preßluftzylinder 43 beaufschlagt, dessen Stößel 39 den Betätigungshebel 5 seitlich so weit ausschwenkt, daß der Mitnehmerzapfen 33 aus der Rastnut austritt, womit die Verbindung zum Arm 31 gelöst wird. Dadurch fällt bzw. klappt die Biegeplatte 4 um die Achse 10 in die Tischebene zurück, sodaß der weitere Materialbandvorschub nicht behindert wird. Andererseits werden aber auch die Preßluftzylinder 44 und 45 betätigt sodaß der Stößel 41 des Zylinders 45 wieder in die Raststellung bewegt wird, und der Betätigungshebel 25 vom Stößel 40 des Zylinders 44 ausgeschwenkt wird. Dabei wird die Nase 46 am Stößel 41 des Zylinders 45 verrastet und der Mitnehmerzapfen 34 gleitet aus der Rastnut, wodurch die Stützplatte 21 in der Tischebene gehalten wird. Die Stößel 39 und 40 werden während der Weiterdrehung der Arme 31, 32 (Fig. 17) wieder rückgestellt. Sobald die Kerbe 37 wieder in der Ausgangs- oder Ruhestellung nach Fig. 12 angelangt ist, greift der Raststößel 38 in diese ein, während die Antriebswelle 8 abgekuppelt wird. Die Nockensteuerung ist somit für diesen Biegevorgang beendet.From the rest position shown in FIG. 12, the bending process is triggered by an electrical pulse. This actuates the aforementioned magnetic coupling of the drive shaft 8 and the two compressed air cylinders 42 and 45. The drive shaft 8 is connected to the main drive via the magnetic coupling via a countershaft of a chain drive, with a selectable ratio which adjusts the rotational speed of the drive shaft 8 to the feed speed of the material strip 1. The locking plunger 38 of the compressed air cylinder 42 is withdrawn from the notch 37 and gives the rotational movement of the arms 31, 32 arranged on the drive shaft 8. The actuation of the compressed air cylinder 45 pulls in the plunger 41, which is latched on the nose 46, so that the actuating lever 25 is pulled up under the action of the spring 47 into the position shown in FIG. 13, so that the support plate 21 pivots through 45 degrees into the catch position. The driver pin 33 of the first arm 31 engages in the rest position (FIG. 12) in the locking groove of the actuating lever 5. The beginning rotation of the arms 31, 32 now initiates the turning process, since the bending plate 4 is pivoted up via the actuating lever 5. In the intermediate position shown in FIG. 14, the two arms 31, 32 extend horizontally and the bending plate 4 is pivoted up by 45 degrees, so that it encloses a right angle with the support plate 21. The stop for the spring-loaded actuating lever 25 of the support plate 21 is arranged so that the latching groove of the actuating lever 25 is at the height of the drive shaft 8, so that in the intermediate position shown in FIG. 14 the driver pin 34 of the arm 32 snaps into the latching groove. 15, both operating levers 5, 25 are now positively guided by the arms 31, 32, so that the bending plate 4 pivots further up and the support plate 21, which increasingly takes up the weight of the tube being formed, into the table plane folds back. The bending process is ended in the position shown in FIG. 15, the locking lever 13 locking the bearing pin 20 in the axis 10. In this position, the compressed air cylinder 43 is acted on, on the one hand, whose plunger 39 laterally swings the actuating lever 5 so far that the driving pin 33 emerges from the locking groove, whereby the connection to the arm 31 is released. As a result, the bending plate 4 falls or folds back about the axis 10 into the table plane, so that the further material band feed is not hindered. On the other hand, however, the compressed air cylinders 44 and 45 are actuated so that the plunger 41 of the cylinder 45 is moved back into the locking position, and the actuating lever 25 is pivoted out of the plunger 40 of the cylinder 44. The nose 46 is locked on the tappet 41 of the cylinder 45 and the driver pin 34 slides out of the locking groove, as a result of which the support plate 21 is held in the table plane. The plungers 39 and 40 are reset during the further rotation of the arms 31, 32 (FIG. 17). As soon as the notch 37 has returned to the starting or rest position according to FIG. 12, the latching plunger 38 engages in it while the drive shaft 8 is uncoupled. The cam control is thus ended for this bending process.

Während der Restdrehung der Arme 31, 32 bis zur Ruhestellung (Fig. 15, Fig. 17, Fig. 12) erfolgt die Rückführung der wieder in die Tischebene geklappten Biegeplatte 4, wobei Fig. 16 eine Zwischenstellung im Detail zeigt, die etwa im Anschluß an die in Fig. 17 gezeigte Zwischenstellung der Nockensteuerung einzuordnen ist. Der Führungsschlitz 11 für den Lagerzapfen 20 weist eine geradlinige Rückführungsstrecke 48 auf, sodaß die Biegeplatte 4 in einer horizontalen Bewegung durch die Rückholeinrichtung in die Ausgangsstellung zurückgebracht wird. Hierzu muß der Beginn des konvexen Führungsschlitzes 11 überbrückt werden. Der Rasthebel 13 weist zu diesem Zweck im Anschluß an seine Rastnase einen Abschnitt 49 auf, der in der rückgeklappten Stellung der Biegeplatte 4 mit der geradlinigen Rückführungsstrecke 48 fluchtet, womit ausschließlich dieser Teil des Führungsschlitzes 11 frei ist. Beim Hochschwenken der Biegeplatte 4 weicht der federbelastete Rasthebel 13 nach unten aus, sodaß die Schwenkbewegung der Biegeplatte 4 nicht behindert wird.During the rest of the rotation of the arms 31, 32 up to the rest position (FIG. 15, FIG. 17, FIG. 12), the bending plate 4 folded back into the table plane is returned, FIG. 16 showing an intermediate position in detail, which follows approximately at the intermediate position of the cam control shown in FIG. 17. The guide slot 11 for the bearing pin 20 has a rectilinear return path 48, so that the bending plate 4 is returned to the starting position in a horizontal movement by the return device. For this purpose, the beginning of the convex guide slot 11 must be bridged. For this purpose, the locking lever 13 has a section 49 following its locking lug, which is aligned with the rectilinear return path 48 in the folded-back position of the bending plate 4, so that only this part of the guide slot 11 is free. When pivoting up the bending plate 4, the spring-loaded locking lever 13 deflects downward, so that the pivoting movement of the bending plate 4 is not hindered.

Die Verbindungseinrichtung, die das einlaufende Materialband 1 kontinuierlich mit der letzten Rohrwicklung verbindet, ist an sich nicht Bestandteil der Erfindung, und kann beispielsweise ein Paar von Falzschließrollen umfassen, von denen eine Schließrolle 15 im Inneren des entstehenden Rohres 12 und die andere außerhalb vorgesehen ist. Die Verbindung bzw. Falzschließung erfolgt dabei in besonders einfacher Weise an der einzigen sich relativ zum Führungstisch nicht verschiebenden Stelle, die das Rohr während der Wicklung durchläuft, nämlich in der vertikalen Axialebene des Stabes 2, also an der engsten Stelle des Durchtrittspaltes.The connecting device, which continuously connects the incoming material strip 1 to the last tube winding, is not in itself part of the invention, and can for example comprise a pair of folding closing rollers, one of which is provided inside the resulting tube 12 and the other outside. The connection or fold closure takes place in a particularly simple manner at the only point which does not move relative to the guide table and which the tube passes through during the winding, namely in the vertical axial plane of the rod 2, so at the narrowest point of the passage gap.

Die innere Schließrolle 15 ist nun an einer schräg in den hohlzylindrischen Stab 2 ragenden Achse oder angetriebenen Welle 16 angeordnet, wobei innerhalb der Leitfläche 3 eine Durchtrittsöffnung 17 in der Wand des Stabes 2 vorgesehen ist (Fig. 10, 11). sodaß die Schließrolle 15 im direkten Kontakt mit dem Verbindungsbereich zwischen dem Materialband 1 und der Wicklung des Rohres 12 steht. Die äußere Gegenrolle ist im Führungstisch 9 unterhalb der Schließrolle 15 angeordnet, jedoch aus Gründen der Übersichtlichkeit nicht dargestellt. Da in Abhängigkeit von der Breite des Materialbandes 1 und von der Größe des herzustellenden Rohres 12 der Einlaufwinkel des Materialbandes 1 geändert werden muß, ist die Schließrolle 15 und die darunterliegende Gegenrolle um eine gedachte Vertikalachse verschwenkbar, die sich durch die Achse des Stabes 2 und den Mittelpunkt der beiden Verbindungsrollen erstreckt. In den Fig. 10 und 11 ist jeweils der maximale Schwenkwinkel zwischen der Welle 16 und dem Stab 2 dargestellt.The inner closing roller 15 is now arranged on an axis or driven shaft 16 projecting obliquely into the hollow cylindrical rod 2, a passage opening 17 being provided in the wall of the rod 2 within the guide surface 3 (FIGS. 10, 11). so that the closing roller 15 is in direct contact with the connection area between the material strip 1 and the winding of the tube 12. The outer counter roller is arranged in the guide table 9 below the closing roller 15, but is not shown for reasons of clarity. Since, depending on the width of the material strip 1 and the size of the tube 12 to be produced, the entry angle of the material strip 1 must be changed, the closing roller 15 and the counter roller underneath it can be pivoted about an imaginary vertical axis which extends through the axis of the rod 2 and The center of the two connecting rollers extends. 10 and 11, the maximum pivot angle between the shaft 16 and the rod 2 is shown.

Werden die Rohrwicklungen durch einen Falz verbunden, wie es durch die gezeigte Schließrolle 15 ermöglicht wird, so weisen die Biegeplatte 4 und die Stützplatte 21 nicht gezeigte Nuten auf, in die die Falzränder des Materialbandes 1 bzw. die Falze zwischen den Wicklungen ragen, sodaß die Biegeplatte 4 und die Stützplatte 21 über die gesamte Breite jeder Wicklung anliegen und eine exakte Führung entlang der Leitfläche erzielt wird. Wie erwähnt können jedoch auch Schweißrollen zum Verschweißen der Materialbahnen vorgesehen sein.If the tube windings are connected by a fold, as is made possible by the closing roller 15 shown, the bending plate 4 and the support plate 21 have grooves, not shown, into which the fold edges of the material strip 1 or the folds protrude between the windings, so that the Bending plate 4 and the support plate 21 rest over the entire width of each winding and an exact guidance along the guide surface is achieved. As mentioned, however, welding rollers can also be provided for welding the material webs.

Das Verfahren eignet sich zur Herstellung kontinuierlich gewickelter Rohre mit beliebigen im wesentlichen eckigen Querschnittsflächen, da sowohl der zu biegende Innenwinkel als auch die Seitenlängen gewählt werden können.The method is suitable for the production of continuously wound pipes with any essentially square cross-sectional areas, since both the inner angle to be bent and the side lengths can be selected.

Claims (12)

1. A process for the coreless helical winding of strips (1) of material, in particular sheet metal strips, to form tubes (12) of substantially angular cross-sectional areas, wherein the strip (1) of material which is continuously advanced is bent around a curved guide surface (3) after a respective predeterminable length of advance movement around an internal angle of the cross-sectional area inclinedly with respect to the direction of advance movement under the effect of an inwardly directed force, the entry side of the guide surface (3) being disposed in the plane of advance movement, wherein when the exit side of the guide surface (3) is reached, the strip (1) of material ceases again to be guided in a bent configuration, to form the adjoining flat section of the strip of material, characterised in that during the entire bending-over operation the bending forces are applied radially with respect to the bending axis, the bending axis representing the axis of curvature of the guide surface (3).
2. Apparatus for carrying out the process according to claim 1 comprising a guide table (9) for the incoming strip (1) of material, a rod (2) arranged in the edge region of the tube (12) being formed and which extends at a spacing corresponding to the thickness of the strip of material above the guide table (9) over at least two windings of the tube (12) and which is provided with a convexly curved guide surface (3), a bending tool (4) which is pivotable about an axis parallel to the support plane of the guide table (9) and which at the end of the bending operation is moved back into the starting position, liberating the advance movement of the strip of material, characterised in that the bending tool is formed by a flat bending plate (4) which is fitted into the guide table (9) and whose top side, which guides the strip (1) of material, rolls against the guide surface (3), pivoting upwardly out of the support plane, during the bending operation, wherein the pivot axis is disposed in the axis of curvature of the guide surface (3), and at the end of the bending operation the bending plate (4) pivots downwardly away from the guide surface (3) into the support plane about an axis (10) parallel to the pivot axis, and finally moves back into the starting position.
3. Apparatus according to claim 2 characterised in that the bending plate (4) has at least one mounting pin (20) which engages into a guide slot (11) extending parallel to the guide surface (3) of the rod (2), and can be locked in the final bending position, forming the axis (10) which is parallel to the pivot axis, at least one controlled actuating lever (5) being pivotally connected to the bending plate (4).
4. Apparatus according to claim 3 characterised in that associated with the actuating lever (5) is a cam control, the drive of which is coordinated with the advance movement of the strip (1) of material.
5. Apparatus acconding to claim 3 characterised in that a spring-loaded latching lever (13) is associated with at least one mounting pin (20) disposed on the bending plate, - the latching lever (13) fixing with respect to the table the axis (10) which passes through the mounting pin (20) prior to the pivotal return movement of the bending plate (4) into the support plane, and having a release projection (14) which is engaged by the bending plate (4) when the pivotal return movement is terminated, releasing the mounting pin (20).
6. Apparatus according to claim 2 characterised in that the rod (2) is of a hollow cylindrical configuration in which at least one inner connecting and in particular closing roller (15) of the connecting means is disposed in parallel relationship with the direction of advance movement of the incoming strip (1) of material, on a shaft (16) extending inclinedly into the hollow-cylindrical rod (2), wherein provided in the lowermost region of the rod (2), which is most closely adjacent to the guide table, is a through slot (17) for the connecting roller (15).
7. Apparatus according to claim 2 characterised in that provided at the side of the incoming strip (1) of material, displaced in the longitudinal direction of the tube, is a support plate (21) which is guided centripetally on the guide surface (3) and which, when the bending operation is initiated, pivots upwardly out of the support plane and, when the tube moves beyond the stable position of equilibrium, forms a support which pivots back into the support plane.
8. Apparatus according to claim 7 characterised in that the support plate (21) has at least one mounting pin (22) which engages into a guide slot (23) which is parallel to the guide surface (3) of the rod (2) and pivotally connected to the support plate (21) is at least one actuating lever (25) which is controlled by a cam control and the drive of which is co-ordinated with the advance movement of the strip (1) of material.
9. Apparatus according to claim 4 or claim 8 characterised in that provided as each cam control is a respective cam disc (7, 24), the control surface of which bears against an intermediate lever (6, 26) which is pivotally connected to the actuating lever (5, 25).
10. Apparatus according to claim 4 or claim 8 characterised in that provided as each cam control is a respective arm (31, 32) which extends radially from the drive shaft (8) and at the free end of which is disposed an entrainment pin (33, 34), and that provided at the free end of each actuating lever (5, 25) is a latching groove into which the entrainment pin (33, 34) engages over an angular range of its rotary movement.
11. Apparatus according to claim 4 or claim 8 characterised in that the two cam controls of the bending plate and the support plate are arranged on a common drive shaft (8).
12. Apparatus according to claim 2 and claim 7 characterised in that for the production of longer tube portions at least one pair of plates which moves synchronously with the bending plate (4) and the support plate (21) is provided at a spacing from the guide table (9).
EP85904579A 1984-09-26 1985-09-26 Method and device for the helicoidal winding of sheet-like material Expired EP0227674B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3042/84 1984-09-26
AT0304284A AT382802B (en) 1984-09-26 1984-09-26 METHOD AND DEVICE FOR SCREW-SHAPING MATERIAL TAPES

Publications (2)

Publication Number Publication Date
EP0227674A1 EP0227674A1 (en) 1987-07-08
EP0227674B1 true EP0227674B1 (en) 1989-05-31

Family

ID=3544408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904579A Expired EP0227674B1 (en) 1984-09-26 1985-09-26 Method and device for the helicoidal winding of sheet-like material

Country Status (6)

Country Link
US (2) US4774827A (en)
EP (1) EP0227674B1 (en)
JP (1) JPS62500439A (en)
AT (2) AT382802B (en)
DE (1) DE3570612D1 (en)
WO (1) WO1986002025A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8758791A (en) * 1990-10-29 1992-05-26 Bubb, Anthony John Allen Improvements in and relating to the formation of helically wound tubing
GB9026063D0 (en) * 1990-11-30 1991-01-16 Spiro Machines Sa Improvements in and relating to the production of helically wound tubing of non-circular cross section
US6113670A (en) * 1998-04-03 2000-09-05 Thermtronix Corporation Twin chamber combustion furnace

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2339219A (en) * 1940-08-03 1944-01-11 Crowiey Edward Chase Method and machine for making tubes
DE1075529B (en) * 1955-03-07 1960-02-18 Compagnie de Pont-ä-Mousson, Nancy (Frankreich) Intermittently working device for the helical winding of metal strip into a tube
AT248839B (en) * 1962-11-13 1966-08-25 Elin Union Ag Method and device for the production of screw sutures
US3694892A (en) * 1970-10-26 1972-10-03 Spir L Ok Ind Ltd Apparatus for and the method of making spiral seamed laminated sheet metal pipe
DE2228935A1 (en) * 1972-06-14 1973-12-20 Fastenrath Fasti Werk METHOD FOR PRODUCTION OF SHEET METAL OD. DGL. EXISTING MULTI-EDGED COLLARS
JPS5728620A (en) * 1980-07-29 1982-02-16 Nippon Steel Corp Manufacture of square steel pipe

Also Published As

Publication number Publication date
EP0227674A1 (en) 1987-07-08
US4884426A (en) 1989-12-05
ATE43520T1 (en) 1989-06-15
AT382802B (en) 1987-04-10
WO1986002025A1 (en) 1986-04-10
JPS62500439A (en) 1987-02-26
DE3570612D1 (en) 1989-07-06
US4774827A (en) 1988-10-04
ATA304284A (en) 1986-09-15

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