WO2017182255A1

WO2017182255A1 - Device and method for producing a coiled tube

Info

Publication number: WO2017182255A1
Application number: PCT/EP2017/057833
Authority: WO
Inventors: Stefan Milowsky; Frank Schmitt; Rolf Bucher
Original assignee: Boa Balg- Und Kompensatoren-Technologie Gmbh
Priority date: 2016-04-19
Filing date: 2017-04-03
Publication date: 2017-10-26
Also published as: DE102016107241A1; EP3445508A1; EP3445508B1

Abstract

The invention relates to a device (2) for producing a flexible coiled tube (10) which can be flexibly elongated to a limited degree and which is made of a continuously supplied strip of a flat metal material, comprising a roll-bending and winding unit (4) to which the strip is supplied and where the strip is brought to an approximately S-shaped or Z-shaped form when viewed transversely to the strip longitudinal direction and wound in a helical manner, thereby forming an undercut that acts in an axial direction (6), wherein a coiled tube (10) is produced which can be moved out of the roll-bending and winding unit (4). The device also comprises a joining and separating unit (12) with a joining and separating station (15) which can be moved in a manner approximately corresponding to the advancing speed and where the coiled tube (10) is cut to length into longitudinal sections (38) of a specified length, and flat material regions which come to rest one over the other at opposite longitudinal end regions (40) of the longitudinal sections (38) are joined in a bonded manner. The device is characterized in that a clamping unit (16) is provided which rotationally fixes the coiled tube (10) continuously being moved out of the roll-bending and winding unit (4) and in this state can be moved away from the roll-bending and winding unit (4) in a rotationally drivable manner approximately at the same rotational speed as the coiled tube (10) moving out of the roll-bending and winding unit and at approximately the same advancing speed as the coiled tube so that the coiled tube is driven in a defined rotating and advancing manner in the region of the joining and separating unit (12), and immediately after running against an end stop (20) in the joining and separating unit (12), a defined length of the coiled tube (10) can be obtained without torsion and clearance between the end stop (20) and the joining and separating station (15).

Description

Title: Apparatus and method for making a vetch hose

Besehreibung

The invention relates to a device for producing a limited flexible elongated and flexible

Winding hose from an endlessly fed strip of metallic flat material, with a roll bending and

Winding unit to which the tape is fed and there is brought in a direction transverse to the tape longitudinal direction approximately S- or Z-shaped configuration and then forming an axially acting rear handle

is wound helically, with one in one

Hose longitudinally endlessly wound winding tube is made, consisting of the Rollbiege- and

Winding unit continuously and with a corresponding to the winding speed resulting

Feed rate in the hose length direction moved out, and with an adjoining the roll bending and winding unit joining and separating unit with an approximately corresponding to the feed speed movable joining and separation point, where the moving out of the roll bending and winding unit endlessly moving

Winding hose is cut in longitudinal sections of predetermined length and coming to lie on opposite longitudinal end portions of the longitudinal sections one above the other coming

Flat material areas are joined cohesively.

Winding hoses, often referred to as Agraffe or Inlocks are used, in particular in metal bellows, in exhaust systems of motor vehicles. Such a part is shown in FIG. By their helical structure of in axial or

Hose longitudinal direction with play engaging behind

Spiral turns are the winding tubes in the axial direction limited longitudinally and also flexible transversely to the tube longitudinal direction. They are therefore suitable for connecting components which are not completely rigidly arranged relative to one another and, moreover, are capable of exerting a vibration-decoupling function. The endless production of such winding tubes from an endless supplied band of metallic

Flat material in a roll bending and winding unit has long been known. For obtaining longitudinal sections of predetermined length can initially endless from the

Roll bending and winding unit moving out

Wickelschlauchabschnitte a contrast large

Longitudinal extension are produced. The winding process can then be interrupted and the very long strand is separated and in subsequent processes in the

separated longitudinal sections. It was also already submitted the proposal, the same from the roll bending and winding unit endlessly moving winding hose to separate into the desired longitudinal sections, so that the roll bending and winding process can be carried out without interruption; for example, according to JP 2007030025 A or EP 2 962

777 AI the roll bending and winding unit downstream of a separation unit, in which the from the roll bending and

Winding unit endlessly moving winding hose is moved in under rotation. Typically, the moves

Hose on insertion supports, in particular on in

Longitudinally extended inlet rollers to achieve the best possible guidance of the winding tube. Nevertheless, this proves to be difficult because of the combined rotation and advancing movement of the endless

Winding tube and consequently helical

Structure torsional forces and spring effects act, which lead to transverse movements of the winding tube, in particular within the separation unit, and at least undefined

Create conditions that large to the control of a particular laser-based cutting device

Make demands. Also, the axial extent of the winding tube in a section to be cut is not sufficiently defined. According to the two aforementioned

Pamphlets has already been an axial end stop for the front free end of the endless winding tube

provided by the problem but not

was satisfactorily resolved.

The present invention is based on the object, the generic device described above and a generic method for producing a

Winding hose or winding hose sections

to improve that a high dimensional accuracy in the production of endged

Winding tube longitudinal sections is achieved without this feedback on the Rollbiege- and Winding process is exercised, which in turn can prove problematic.

This object is achieved in a device of the type mentioned in the present invention, that a clamping unit is provided, which rotatably fixed the winding tube endlessly moving out of the roll bending and winding unit and in this state with approximately

the same speed of rotation as itself

herausbewegende winding tube rotatably driven and with approximately the same feed rate as the

Winding hose of the roll bending and winding unit is movable away, so that the winding hose in the joining and separating unit a defined rotation and

Feed drive learns and immediately after starting against an end stop in the joining and separating unit, a defined length of the winding tube, with the exclusion of twisting and play between the end stop and the joining and separating point is obtainable.

By inventively provided clamping unit of the winding tube between the Rollbiege- and

Wrapping unit and the separation and joint to be taken, the clamping unit drives the winding tube itself rotating and exerts a feed movement, both with approximately the same revolution and

Feed rate as that of moving out of the roll bending and winding unit

Winding hose. This opens up the possibility that the tensioning unit can move the winding tube with its free end against an axial end stop, so that the helical or helical turns of the winding tube in the axial direction substantially against each other rest against each other, so that a defined longitudinal extent of Wickeischlauchs is realized. Since the clamping unit between the roll bending and winding unit and the separation and joint is arranged, thereby no axial forces in the direction of the rolling and bending

Transfer back winding unit, which there

running roll bending and winding process could interfere.

The clamping unit could be designed in basically any way, as long as it is able to fix the winding tube rotatably driven and advanceable. In

Further development of the invention it is proposed that the clamping unit is designed as a chuck unit and has radially deliverable jaws, wherein extending from the roll bending and winding unit endlessly moving winding tube extends through the chuck unit therethrough. The clamping unit can therefore at an in

Hose longitudinal direction movable headstock be provided.

It would be conceivable that from the Rollbiege- and

Winding unit endlessly moving winding tube is only immediately before the process of cutting to a defined longitudinal section of the clamping unit is fixed. In contrast, an embodiment is preferred in which the winding tube is effectively fixed and driven by the clamping unit during the entire rotation and feed process. For this purpose, it proves to be advantageous if the clamping unit in the feed direction of the endlessly moving out of the roll bending and winding unit winding tube is movable back and forth, so that the clamping unit repeatedly from the

Loosened winding hose and can be moved back against the feed direction of the winding tube to again fix the winding tube. In this way, the Winding hose except for the interruption phases, during which the clamping unit is moved back through the

Clamping unit taken and defined to be guided.

Preferably, the end stop cooperates with an end position sensor, one with the feed movement of the

Clamping unit synchronous feed movement of the end stop initiated. So if by starting the winding tube against the end stop and after a play-free concern of the helical or spiral turns in the axial direction

against each other a defined longitudinal extent of

Winding hose is fixed, the whole arrangement of clamping unit and end stop can with the same

Feed rate to be moved. Meanwhile, at a predetermined point, the joint connection and the separation of the longitudinal section of the winding tube

be executed. If the end stop stationary

is formed, the clamping unit would have been previously moved with respect to the feed speed of the winding tube slightly larger feed rate to have built in the axial direction of a certain buffer, which then during the execution of the joining and

Is used up. This would be conceivable in principle; nevertheless, the above-described

Embodiment preferred in which the entire

Winding hose in continuous feed movement also remains within the separation unit.

According to a further embodiment of the invention, it proves to be advantageous if the end stop is spring-biased against the advancing direction of the winding tube. In this way, the defined by the clamping unit feed movement of the winding tube can be given a certain resistance, so that the Screw or helical turns of the winding tube in the axial direction are laid backlash against each other.

It also proves to be advantageous if a guide pin extends away from the end stop against the feed direction of the winding tube, so that the

As a result of its feed movement, the winding tube is pushed onto the guide mandrel, resulting in a defined inner diameter of the winding tube. Of the

Guide mandrel preferably extends over at least the entire longitudinal extent of the separated

Longitudinal section of the winding tube. He is

expediently tubular and comprises a transverse opening in the region of the separating and joining point, in order not to hinder the separation and joining process, preferably by means of laser energy.

As mentioned, the subject of the invention is also a method having the features of claim 8.

Further details, features and advantages of the invention will become apparent from the appended claims and the drawings and the following description of a preferred embodiment of the invention.

In the drawing shows:

Figure 1 is a schematic representation of a

inventive device for producing a winding tube (still without winding tube);

Figure 2 is a schematic representation of the device according to

Figure 1 at the beginning of a manufacturing process; FIG. 3 shows the device according to FIG. 2 directly at

Starting the winding hose against a

stop;

Figure 4 shows the device of Figure 3 in sprung

Condition of the end stop and beginning of joining and cutting;

Figure 5 shows the device according to claim 4 after execution of

Joining and separating process;

6 shows a component for an exhaust system with a

Winding hose; and

7 shows a cross section through the wall of the

Winding hose according to FIG. 6.

The figures show schematically an inventive

Device 2 for producing a winding tube from an endlessly fed strip of metallic

Flat material. The device comprises a per se

known and therefore only schematically indicated roll bending and winding unit 4. In the roll bending and winding unit 4, the endless supplied band of metallic

Flat material brought in cross-section S- or Z-shaped and helically wound to form an acting in the axial direction 6 rear grip, so that in a hose longitudinal direction 8 endlessly extending winding tube 10 is produced, which is continuously at a feed speed corresponding to the winding speed in the

Hose longitudinal direction 8 moved out of the roll bending and winding unit 4. The roll bending and winding unit 4 downstream in the axial direction 6 is a joining and Separating unit, which is designated by the reference numeral 12. The joining and separating unit 12 comprises a joining and

Separating device 14, which preferably operates with laser energy and disposed in the region of a separating and joining point 15 and in the axial or hose longitudinal direction 6, 8 and preferably also in the radial direction is movable. The joining and separating unit 12 further comprises a clamping unit 16, which is arranged on a tailstock 18 and also in the axial or hose longitudinal direction 6, 8 can be moved. Furthermore, the separation unit 12 comprises an end stop 20 and a gripping device 22 for removing separated longitudinal sections.

Figures 2 to 5 illustrate the preparation of a longitudinal section of a winding tube. According to Figure 2, a winding tube 10 extends endlessly from the

Roll bending and winding unit 4 out in

Hose longitudinal direction 8. A free end 24 of the

Winding hose 8 has already extended through the clamping unit 16. The clamping unit 16 is preferably as a chuck unit 26 with radially deliverable

Clamping jaws 28 formed. As soon as the free end 24 of the winding hose 10 extends through the tensioning unit 16 at the beginning of a production process, the winding hose is fixed in the tensioning unit 16. The

Clamping unit 16 is rotationally driven at variable rotational speed. In the clamped state of

Winding tube 10 is the clamping unit 16 with preferably exactly the rotational speed of the winding process driven in rotation and in the axial or

Hose longitudinal direction 6, 8 back and forth, so moved away from the roll bending and winding unit 4 and moved back again. As soon as the free end 24 of

Winding tube 10 through the chuck unit 26th has moved through, the winding tube 10 is clamped by the clamping jaws 28 and thereby fixed. The

Chuck unit 26 is then driven in rotation and in the tube longitudinal direction 8 of the rolling and

Winding unit 4 moves away, and preferably at the same feed rate of the winding process.

As a result, the winding tube is stabilized and continue with defined rotational drive and feed

transported without causing warping in the area between the roll bending and winding unit 4 and the joining and separating unit 12. After a predetermined distance, the chuck unit 26 is released by loosening the jaws 28 and moved back in the axial direction 6, again to clamp the winding tube further back and weiterzutransportieren. The tensioning unit 16 thus performs a quasi-continuous guided transport of the winding hose 10, which is interrupted only by the return movement.

With increasing feed movement of the winding tube 10 in the joining and separating unit 12, the end stop 20 in the direction of the free end 24 of the winding tube

method. The end stop comprises an axial one

Stop surface 30 from which a guide pin 32 projects in the axial or hose longitudinal direction 6, 8 in the direction of the clamping unit 16. This guide pin is inserted into the free end 24 of the winding tube 10, so that the winding tube 10 in the feed direction on the

Guide mandrel 32 is pushed. Finally, the free end 24 comes in axial abutment against the axial

Stop surface 30. The screw threads or spirals of the winding tube 10 are now pressed without play in the axial direction 6 against each other, and then the end stop 20 is pressed against a spring assembly 34. This will be a End position sensor actuated, which the end stop 20 exactly synchronous and with the same feed movement of the

Clamping unit 16 moves in the figure 4 to the right. In this way, the backlash in the axial direction 6 state of the against the axial

Stop surface 30 supporting winding tube 10th

maintained. In this state, the joining and

Separation performed by the joining and separating device 14. The joining and separating device 14 is also movable synchronously with the clamping unit 16 and the end stop 20 in the axial direction 6. It is typically initially in a position in the axial or

Hose longitudinal direction 6, 8 positioned to perform a first joint seam at the superimposed in the radial direction flat material portions of the winding tube. Thereafter, the separator is slightly moved in the axial direction 6, to form a second joint seam. Thereafter, the separation processing is carried out in the axial direction 6 between the seams. Instead of the first and the second joining seam, it would also be conceivable to carry out a continuous or quasi-continuous joining seam or other succession of joints in a sinusoidal or otherwise reciprocating manner. Since the winding tube 10 rotates meanwhile and with the feed speed of the clamping unit 16th

is transported, is also the joining and

Separator 14 with corresponding

Feed rate during the execution of the joining ^¬ or, the separation process in the figure 4 moves to the right, so that a separating cut in an orthogonal to the tube longitudinal direction 8 level can be performed.

After completion of the joining or cutting processing, the joining and separating device 14 in the radial direction 36 moved back from the winding tube 10 (Figure 5). The

Gripping device 22 is in the radial direction 36 for

Grasping the separated longitudinal portion 38 of

Wickelschlauchs 10 moved up. Then the

End stop 20 and the guide pin 32 in Figure 5 moved in the tube longitudinal direction 10 to the right from the longitudinal portion 38, so that by means of the gripping device 22 of the longitudinal portion 38 can be removed. A respective removed longitudinal section 38 thus has two in

Circumferential direction continuously or quasi-continuously or intermittently joined longitudinal end portions 40 and an exact section length.

Then, the process just described for separating the next following longitudinal section is repeated.

Meanwhile, the metallic sheet becomes

continuously, d. H. not interrupted, brought in the roll bending and winding unit 4 in the form of the winding tube 10. An interruption of this process is only when replacing a flat roll with a new

required, provided that the longitudinal ends can not be connected to each other on impact. Overall, can be made in an endless continuous process longitudinal sections of winding tubes with joined longitudinal end portions and exact dimensions in the longitudinal direction without the problems mentioned above occur or

would have to be compensated.

Figure 6 shows an initially mentioned component for a

Exhaust system of a motor vehicle with a rohrformigen bellows 42, a longitudinal portion 38 of a

Wrapping tube 10 surrounds. The components are over

Pipe fittings 44 at the longitudinal ends together

Cohesively connected. Figure 7 shows still schematically a cross section through the wall of the winding tube 10 with a positive fit in the axial or hose longitudinal direction behind

Windings of the previously S- or Z-shaped metallic flat material strip.

Claims

claims

1. Device (2) for producing a limited flexible elongated and flexible winding tube (10) from an endlessly fed band of metallic

Flat material, with a roll bending and winding unit

(4), to which the tape is fed and is brought there in a direction transverse to the tape longitudinal direction approximately S or Z-shaped configuration and then under

Forming an acting in the axial direction (6) rear handle is helically wound, wherein in a tube longitudinal direction (8) endlessly extending winding tube (10) is made, from the roll bending and winding unit (4) continuously and at a speed corresponding to the winding itself resulting feed rate in the

Hose longitudinal direction (10) moved out, and with a to the roll bending and winding unit (4)

subsequent joining and separating unit (12) with an approximately corresponding to the feed speed movable joining and separating point (15), where the from the roll bending and winding unit (4) endlessly moving out winding tube (10) in longitudinal sections

(38) of predetermined length is cut to length and on

opposite longitudinal end regions (40) of

Longitudinal sections (38) to be superimposed flat material areas are joined cohesively, characterized in that a clamping unit (16) is provided, which from the roll bending and winding unit (4) endlessly moving out

Winding hose (10) rotatably fixed and in this state with about the same Rotation speed as the winding-out winding hose (10) can be driven in rotation and with approximately the same feed rate as the winding tube of the roll bending and winding unit (4) is movable away, so that the winding tube in the joining and separating unit (12)

defined rotation and feed drive learns and immediately after starting against an end stop (20) in the joining and separating unit (12) a defined length of the winding tube (10), excluding twisting and play between the end stop (20) and the joining and Separation point (15) is obtainable.

Apparatus according to claim 1, characterized in that the clamping unit (16) as a chuck unit (26) is formed and radially deliverable clamping jaws (28), wherein the out of the roll bending and winding unit (4) endlessly moving out

Winding hose (10) through the chuck unit (26) extends therethrough.

Apparatus according to claim 1 or 2, characterized

characterized in that the clamping unit (16) in the feed direction of the out of the roll bending and

Winding unit (4) endlessly moving out

Winding hose (10) is movable back and forth, so that the clamping unit (16) repeatedly from the

Winding hose (10) solved and against the

Feed direction of the winding tube (10) can be moved back to re-fix the winding tube (10).

4. Apparatus according to claim 1, 2 or 3, characterized

characterized in that the end stop (20) cooperates with a limit sensor, which is one with the Feed movement of the clamping unit (16) synchronous

Feed movement of the end stop (20) initiated.

5. Device according to one or more of the preceding claims, characterized in that the

End stop (20) counter to the feed direction of the winding tube (10) is spring preloaded.

6. Device according to one or more of the preceding claims, characterized in that from the end stop (20) a guide pin (32) against the feed direction of the winding tube (10) away

extends, so that the winding tube is pushed due to its advancing movement on the guide pin and thereby results in a defined inner diameter of the winding tube.

7. Device according to one or more of the preceding claims, characterized in that the joining and separating unit (12) operates by means of laser energy.

8. Method of making a limited flexibility

Elongated and flexible winding tube (10) from an endlessly fed band of metallic

Flat material, using a device (2) according to one or more of the preceding claims, comprising a roll bending and winding unit (4), to which the strip is fed and is brought there approximately S- or Z-shaped in a direction transverse to the strip longitudinal direction and then under

Forming an acting in the axial direction

Be wound helically, wherein in a tube longitudinal direction (8) endlessly extending winding tube (10) is produced, consisting of the roll bending and winding unit (4) continuously and with a feed speed corresponding to the winding speed in the

Hose longitudinal direction (8) moved out, and with a to the roll bending and winding unit (4)

subsequent joining and separating unit (12) with an approximately corresponding to the feed speed movable joining and separation point (15), where the from the roll bending and winding unit (4) endlessly moving out winding tube (10) is cut into longitudinal sections (38) predetermined length and on

opposite longitudinal end regions (40) of

Longitudinal sections (38) to be superimposed flat material areas are joined cohesively, characterized in that from the

Roll bending and winding unit (4) endless

herausbewegende winding tube (10) by means of a clamping unit (12) rotatably fixed and in this

State with about the same

Turning speed like that

Winding speed is driven in rotation and at about the same feed rate as the winding tube (10) of the roll bending and

Winding unit (4) is moved away, so that the

Winding hose (10) in the area of the joining and

Separation unit (12) undergoes a defined rotation and feed drive (20) and immediately after starting against an end stop in the joining and separating unit in the axial direction (6)

pushed together backlash configuration of the

Winding tube (10) is obtained, so that a defined length of the winding tube (10) under

Exclusion of twist and play between the

End stop (20) and the joining and separating point (15) is produced and thus a longitudinal portion (38) of defined length is separated.