EP2956254B1 - Flanging attachment for expanding cylindrical pipe ends - Google Patents

Description

The invention relates to a crimping attachment for expanding cylindrical pipe ends for an automatically operable handheld device according to the preamble of claim 1. The invention also relates to a set of such crimping attachments for different pipe diameters.

For the creation of detachable pipe connections so-called Bördelverschraubungen are often used. For this purpose, the cylindrical tubes, often copper tubes, provided with a special union nut. The pipe end is widened conically with a flaring tool adapted to the pipe diameter. With the union nut, the pipe is screwed to the flare flange without any further sealant. This connection technology is used for example in refrigeration technology. But also in the automotive sector, this technique is used among other things in the detachable connection of brake lines.

From the prior art a variety of differently shaped flanging tools are known. For example, manual crimping tools are known, which are formed like pliers. In this case, first the tube end is fixed with radially to each other movable jaws and then delivered a flaring axially to the pipe end to widen this to the desired extent. Such crimps are designed especially for smaller pipe diameters and softer pipe materials, since manual operation requires a relatively large amount of force.

There are already automatic flanging known, which are usually driven pneumatically. These flanging machines are designed as stationary machines and are not suitable for use on site.

There are also hand tools known for flaring thin copper tubes with diameters up to ¾ inches known. These handsets are each designed for a single pipe diameter. There are also hand tools available that come with a special clamping device equipped and must be retrofitted for different pipe diameters.

In the US 4,831,855 a crimping device is described which may be formed as a cap which is attachable to an electrically driven hand drill. The adapter has two plate-shaped clamping jaws, between which a tube can be clamped. For this purpose, the two plate-shaped clamping jaws are screwed together or clamped to each other via other clamping devices. The two plate-shaped clamping jaws are equipped with mutually corresponding half-shell-shaped receptacles for a tube. For the determination of tubes of different diameters each have several different sized half-shell-shaped receptacles are recessed in the plate-shaped jaws. In a threaded bore opposite a receptacle, a threaded rod is rotatably mounted, at the front end of which a flanging iron or an expander device is arranged. By turning the threaded rod the crimping iron is delivered to the pipe end to be expanded. The turning of the threaded rod, for example, by means of the spindle drive of the hand drill. The handling of this designed as an attachment crimping device is relatively cumbersome. First, the tube must be clamped between the jaws. Care must be taken to ensure a correct distance of the pipe end from the flaring iron, so that it can be widened to the correct extent. Although the advance of the crimping iron attached to the threaded rod is predetermined by the steepness of the thread of the threaded bore or the threaded rod. Nevertheless, the feed is not exactly controllable, since the drive of the threaded rod on the rotary spindle of the hand drill is only relatively inaccurate. If the crimping iron is driven in each case to stop during operation, this can lead to damage of the crimping iron or even the drive of the hand drill.

It is therefore an object of the present invention to remedy the disadvantages of prior art crimping devices. It is to be created a flare for expanding cylindrical pipe ends for an automatically operated handset, which is easy to handle and without much effort. The crimping attachment should allow an exact and reproducible expansion of a cylindrical pipe end. This pipe ends of pipes of different materials, such as copper, brass, steel, Plastic (eg PEX), with or without plastic coating, easy to expand. The crimping attachment should be operable with electric, pneumatic or hydraulic drives. Another way to operate the crimping attachment can also be done with a pair of pliers, preferably with a hydraulic pliers. A time-consuming retooling for different pipe diameters should be avoided.

The solution to these problems consists in a crimping attachment for expanding cylindrical pipe ends for an automatic handset, which has the features mentioned in the characterizing portion of claim 1. Further developments and / or advantageous embodiments of the invention are the subject of the dependent claims.

The present invention designed flare is designed for operation with an electrically, pneumatically or hydraulically operated hand-held device. The crimping attachment for expanding cylindrical tube ends has a connection interface for the hand-held device, clamping devices for a cylindrical tube and a widening device. The expansion device can be delivered axially onto a pipe end fixed by the clamping device in order to widen it to the desired extent. According to the invention, the clamping device and the expansion device are coupled together via a limited axially displaceable coupling member and sequentially activated. By the clamping device and the expansion device are coupled together, eliminates the cumbersome clamping of the tube in the clamping device before the actual expansion process can take place. The clamping of the tube and the expansion process via a single limited axial displacement of the coupling element. The clamping process and the expansion process are triggered sequentially by the axial displacement of the coupling element. The axial displacement of the coupling element takes place with the aid of the electrically, pneumatically or hydraulically operable drive unit, preferably with a hand-held unit, with which the crimping attachment is connected via its connection interface. The pipe end is thus widened by machine. This eliminates physical effort, as they are required, for example, in the operation of known crimping pliers.

In a first embodiment of a concrete implementation of the proposed inventive beading underlying general inventive concept, the clamping device is disposed within a cylindrical housing. The clamping device has a number annularly arranged clamping jaws with clamping areas, which are automatically radially deliverable upon insertion of a cylindrical tube on a jacket of the tube to set this. The expansion device is formed as a substantially conical Aufweitdorn mounted on a substantially coaxial with the annular arrangement of the jaws extending push rod and deliverable axially to a pipe end of the fixed pipe. The push rod is arranged to be axially displaceable in an axial bore of the coupling element designed as a control sleeve. On its outer surface, the control sleeve on control tracks for a radial tilting of the jaws. The control sleeve is so limited axially displaceable against the restoring force of a return spring, that the inserted tube can be fixed on the radially deliverable jaws before the mandrel is axially deliverable to the pipe end.

The control sleeve, the guided in the bore of the control sleeve push rod with the expanding mandrel and the annularly arranged jaws have within the cylindrical housing a space-saving, substantially coaxial arrangement. This arrangement makes it possible to convert the limited axial displaceability of the control sleeve on the control tracks on the outer surface of the control sleeve in a radial movement of the jaws on each other. The arrangement of the control sleeve ensures that the push rod with the expanding mandrel is only then delivered to the pipe end, after the pipe has been fixed sufficiently firmly by the jaws. The activation of the crimping attachment is essentially limited to the limited axial displacement of the control sleeve, which is done by the electrically, pneumatically or hydraulically operable handset. The fixing of the tube and the expansion of the pipe end are carried out automatically. The return spring ensures that the control sleeve is moved back to its original position at the end of the crimping process. As a result, the push rod is withdrawn with the Aufweitkonus, and the jaws release the tube with the widened pipe end to the desired extent again, so that it can be pulled out of the Bördelaufsatz.

A variant of the inventive crimping attachment can provide that the clamping jaws are tiltably mounted within the cylindrical housing. In this case, their end sections facing away from the clamping regions interact with the control tracks on the outer surface of the control sleeve. This simple design allows the transmission of clamping forces in the desired extent on the tube end inserted into the essay. These are essentially only dependent on the course and on the steepness of the control tracks on the outer surface of the control sleeve.

In a further embodiment variant of the invention, the end sections of the clamping jaws are loaded by pressure bolts whose free ends preferably form receptacles for rolling elements which are in engagement with the control tracks on the outer surface of the control sleeve, the clamping jaws can very reliably follow the course of control tracks. A function of the detrimental friction of the interacting components can be largely avoided.

In a further simplified embodiment, it is also possible to dispense with the control tracks and rolling elements, the force being transmitted via the pressure bolts directly to the clamping jaws via the outer surface of the control sleeve.

The clamping force with which the clamping jaws define the inserted tube end can be selectively controlled via the course of the control tracks on the outer surface of the control sleeve. A variant of the Bördelaufsatzes can therefore provide that the control tracks on the outer surface of the control sleeve are at least partially formed such that with increasing axial displacement of the control sleeve against the restoring force of the return spring, the clamping force of the jaws can be amplified. This is achieved, for example, by a change in the pitch of the control track, which results from a section-wise enlargement of the outside diameter of the control sleeve.

In a further embodiment variant of the crimping attachment, in addition to or as an alternative to the clamping force of the clamping jaws, the control tracks on the outer surface of the control sleeve can have one or more regions which are designed in such a way that, after a predetermined clamping force has been reached during a further axial displacement of the control sleeve the clamping force is constant. A Such embodiment of the invention may be of interest, for example in Bördelaufsätzen, which should be used primarily for the expansion of the pipe ends of plastic pipes. It can also be provided that the Aufweitkonus remains over a longer period in engagement with the pipe end, so that an elastic recovery of the expansion can be counteracted. This can be achieved, for example, by leaving the handset in the advanced position for the required longer period of time. Once the handset releases the control sleeve, that is no longer forces in the advanced position, this is moved back by the restoring force of the return spring to its original position. In this case, the Aufweitkonus be withdrawn and the jaws moved radially apart again to release the pipe end.

As an alternative to the purely mechanical actuation of the jaws on the arranged on the outer surface of the control sleeve control tracks can also be actuated by the axial displacement of the control sleeve, a trigger that activates a hydraulic Betätigungsmechnismus for the jaws. For example, then hydraulically radially displaceable push rod can cooperate with the end portions of the jaws to tilt the jaws in their clamping position.

Another embodiment of the invention may also provide that the jaws are manually slightly radially apart, for example, to facilitate the insertion of a tube in the crimping or the removal of a tube with flared pipe end. For this purpose, the cylindrical housing relative to the jaws and against the restoring force of a tension spring limited in the direction of the Anbindeschnittstelle be displaced. A projecting from an inner surface of the cylindrical housing and at least partially circumferential projection which normally presses on the jaws is thereby displaced and releases the jaws. At the insertion end of the housing cooperating with the clamping jaws forced operation is arranged, via which the jaws are pressed radially outwardly during axial displacement of the housing. The restoring force of the tension spring for the housing is greater than the restoring force of the return spring for the control sleeve. This ensures that the housing is not moved unintentionally with the axial displacement of the control sleeve.

A further embodiment of the invention can provide that the clamping jaws are arranged such that their longitudinal axes with each other enclose an angle which is greater than 0 °. Preferably, the jaws are inclined with respect to the longitudinal axis of the crimping attachment at an angle of about 1 ° to 15 ° in the opening direction, so that the jaws are always slightly V-shaped to each other. As a result, the insertion of a pipe end is facilitated in the crimping attachment.

The axial displacement of the control sleeve may also be accompanied by a rotational component. In such an embodiment of the inventive beading the control sleeve is rotatably mounted and control tracks are formed on their outer surface as curved tracks.

A simple embodiment of the invention may provide that the return spring and the tension spring are helical compression springs. Helical compression springs are available in all desired strengths and have been tried and tested. It will be understood, however, that with minor structural modifications, which are within the skill of those of ordinary skill in the art, other types of springs or spring elements may be employed in place of helical compression springs, such as e.g. Tension springs, conical springs, leaf springs etc.

A variant of the invention may provide that the clamping device of the crimping attachment comprises at least three jaws and on the outer surface of the control sleeve, a corresponding number of control tracks is formed. With at least three jaws a pipe is already reliably fixed.

In order to make the individual jaws less massive, it can be provided in a further embodiment of the crimping attachment that the clamping device comprises six jaws and on the outer surface of the control sleeve, a corresponding number of control surfaces is formed.

To ensure the limited axial displacement of the control sleeve may be provided within the cylindrical housing an end stop. The control sleeve in turn, may have a stop for the push rod connected to the mandrel.

For the processing, in particular for the expansion, of pipes with different outside diameters, a set of flare attachments is provided. The Bördelaufsätze are each formed according to one of the presented embodiments. If the user wants to machine pipes with different outside diameters, it is sufficient if he exchanges the flare attachment on the handset. The connection interfaces can be, for example, screw threads, fork connections or bayonets, which interact with corresponding interfaces on the hand-held device. The change of the Bördelaufsatzes can therefore be very simple, fast and usually done without tools. In contrast to flaring devices known from the prior art, therefore, a separate flanging device is not required for each pipe diameter. The hand-held device can also be a universal hand-held device, which, in addition to crimping attachments, also with other attachments for further processing steps, such as e.g. Cutting, pressing, connecting by sliding sleeve technology, etc. can be equipped. As a result, the use of the handheld device can be optimized.

An exemplary set of crimping heads according to the invention consists of crimping heads for pipe diameters of 4 mm to 63 mm. This means that the majority of the pipe diameters customary in installation technology can be machined.

For better identification of the different crimping attachments for different outside diameters of a set of crimping heads, the individual crimping collars for different pipe diameters can be distinguished from each other by optical markings. For example, a set of Bördelaufsätzen for each crimping tips for different pipe diameters provide different color coding, which are preferably mounted on the insertion side for a pipe on the cylindrical housing. But it can also have the entire housing of the individual flare caps, depending on their diameter from each other different colors. However, instead of or in addition to colored markings, the individual flare attachments of a set may also have embossed markings in the housing which, for example, directly indicate the outside diameter of a suitable tube, etc.

Fig. 1

eine auseinander gezogene perspektivische Darstellung eines Bördelaufsatzes;

Fig. 2

eine axial geschnittene Darstellung eines Bördelaufsatzes in der Ausgangssituation;

Fig. 3

eine axial geschnittene Darstellung des Bördelaufsatzes gemäss Fig. 2 mit einem eingesetzten Rohr und bereits aufgeweitetem Rohrende;

Fig. 4

und 5 perspektivische Ansichten zweier Ausführungsformen eines mit einem Handgerät verbundenen Bördelaufsatzes;

Fig. 6

eine Seitenansicht eines weiteren Ausführungsbeispiels eines an einem Handgerät montierten Bördelaufsatzes; und

Fig. 7

eine perspektivische Ansicht eines Sets von Bördelaufsätzen für unterschiedliche Rohrdurchmesser.

Further advantages and features of the invention will become apparent from the following description of an embodiment of a crimping attachment for expanding a pipe end. In a schematic representation:

Fig. 1

an exploded perspective view of a crimping attachment;

Fig. 2

an axially sectional view of a crimping attachment in the initial situation;

Fig. 3

an axially sectional view of the Bördelaufsatzes according to Fig. 2 with an inserted pipe and already expanded pipe end;

Fig. 4

and Figure 5 are perspective views of two embodiments of a crimping attachment associated with a handset;

Fig. 6

a side view of another embodiment of a mounted on a hand tool Bördelaufsatzes; and

Fig. 7

a perspective view of a set of Bördelaufsätzen for different pipe diameters.

An in Fig. 1 Wherein the illustration shows all components of this embodiment of a crimping attachment, the following description is limited to those components that are essential for the understanding of the invention. The crimping attachment 1 has a cylindrical housing 2, in which all components required for the function of the crimping attachment are accommodated. The cylindrical housing 2 encloses a guide member 3 with a connection interface 30 for the connection of the crimping attachment 1 to an electrically, pneumatically or hydraulically operable handset resp. Hand pliers (not shown). For example, the connection interface 30 is designed as a bayonet for a corresponding bayonet catch on the hand tool. The connection interface can for example also be designed as a screw thread. The guide member 3 has a central axial bore 4, which accommodates an expansion device comprising an expansion cone 5, which is connected via a fastening screw 61 with a push rod 6. A plurality of clamping jaws 7 of a clamping device for a pipe to be expanded are arranged in an annular manner around the guide part 3 and are supported tiltably on abutment surfaces 31 of the guide part 3. The movement of the jaws 7 of the clamping device and the push rod 6 with the expansion cone 5 of the expansion device fastened thereto are coupled to one another via a coupling element, which is designed as a control sleeve 8. The control sleeve 8 is limited axially displaceable against the restoring force of a return spring 9 in the central bore 4 of the guide member 3. The return spring 9, for example a helical compression spring, is supported in an annular extension (not visible) of the central axial bore 4 of the guide member 3 and on a circumferential flange 81 at the end remote from the guide member 3 end of the control sleeve 8. The control sleeve 8 has an axial through hole 82 which receives the push rod 6. A screw 62 prevents the push rod 6 from sliding out of the central through-hole 82 of the control sleeve 8. On its outer surface, the control sleeve 82 control tracks 83, via which the tilting of the jaws 7 is controllable. In the assembled state end portions 71 of the jaws 7 act via pressure pin 73 and rolling elements 74, which project through substantially radially extending bores 32 in the guide member 3 in the central bore 4, with the control tracks 83 on the outer surface of the control sleeve 8 together. The end portions 71 of the jaws 7 opposite ends form clamping portions 72 for a pipe to be fixed. A rocker pad 11, whose function will be explained in more detail below, cooperates with jaws 7.

The cylindrical housing 2 of the crimping attachment is axially displaceably mounted relative to the guide part 3 and the expander device received therefrom or the clamping jaws 7 of the clamping device which are annularly arranged around it. For this purpose, a stop 21 is provided within the housing 2, on which a tension spring 10, for example a helical compression spring, is supported. The opposite end of the tension spring 10 is supported on a radial extension 33 of the guide part 3. By relative displacement of the cylindrical housing 2 relative to the guide member 3 and the jaws 7, these are released by a protruding from the inner wall of the housing 2, at least partially encircling clamping ring 22, which normally presses on the jaws 7, also retracted, for example, a expanded pipe end too remove. At the insertion end of the axially displaceable housing 2 in recesses 25 mountable engaging pin 26 engage in slot guides 76 at the back of the jaws 7 and form a positive guide for the jaws 7. During axial retraction of the housing 2 slide the engaging pin 26 in the slot guides 76 in the direction Since the slot guides 76 extend obliquely into the body of the respective clamping jaw 7 from the rear side, the clamping jaws 7 are pressed radially outward during the displacement of the housing 2 and opened. The recesses 25 at the insertion end of the housing 2 are covered by a closing ring 13 in the assembled state.

In a further embodiment, it is also possible to dispense with the positive guidance of the clamping jaws 7 and to be achieved by means of pressure springs between the individual clamping jaws 7, in that the clamping jaws 7 are pressed outwards and opened.

Fig. 2 shows an axial section of the composite crimping attachment 1. The same reference numerals designate the same components as in Fig. 1 , The return spring 9 holds the control sleeve 8 and thus also the push rod 8 with the attached expansion cone 5 in its retracted position. In this case, as shown, the flange 81 and a part of the return spring 9 protrude from the connection interface 30. In this case, the flange 81 provided with the end of the control sleeve 8 projects beyond the push rod 6. The jaws 7 are in each case via the pressure pin 73 and the rolling elements 74, which project through the associated radial bore 32 in the guide part 3, in contact with the associated control track 83 In particular, they are each located at an inlet of the control track 83, which preferably has only a slight incline. Fig. 2 also shows the tension spring 10, which extends between the stop 21 on the inner surface of the cylindrical housing 2 and the radial extension 33 of the guide member 3. Also protruding from the inner wall projection 22, which loads the jaws 7, can be seen in the illustration. The jaws 7 are preferably held in the housing 2 such that they enclose an angle of approximately 1 ° to 15 ° with the longitudinal axis of the crimping attachment 1. As a result, they are inclined to each other in the opening direction in a V-shape. This facilitates the insertion of a pipe end into the crimping attachment 1.

Fig. 3 shows the crimping attachment 1 in an analogous to Fig. 2 axially cut representation at the end of the expansion process of a pipe end R. The same components are in turn provided with the same reference numerals as in Fig. 1 and 2 , The control sleeve 8 and the push rod 6 with the expansion cone 5 attached thereto are in their end positions. This is predetermined, for example, that the flange 81 is moved to the control sleeve 8 against a stop. Alternatively, the return spring 9 could be compressed to "block".

The operation of the clamping operation on the tiltably mounted clamping jaws 7 and the expansion process are coupled to each other via the axial displacement of the control sleeve 8. During axial advancement of the control sleeve 8 (in FIGS. 2 and 3 to the right) is due to the distance between the rear end of the push rod 6 and the flange 81 having the end of the control sleeve 8 ( Fig. 2 ) initially only the control sleeve 8 axially displaced. The axial feed movement takes place for example by a plunger of the drive of the handset, which is connected via the connection interface 30 with the crimping attachment 1.

In the axial displacement of the control sleeve 8, the rolling elements 74, which slide or roll along the control tracks 83, reach into an outer diameter larger area of the control sleeve 8. This increases over the pressure pin 72 of the radial expansion pressure to the outside on the end portions 71 of the jaws 7. Since the Jaws 7 are tiltably mounted, increases by the increased spreading pressure exerted by the clamping portions 72 of the jaws on the pipe end clamping force. As a result, the pipe end R is fixed. Once the flange 81 of the control sleeve 8 is flush with the end of the push rod 6 and the screw 62, the control sleeve 8 and the push rod 6 are moved together with the attached expansion cone 5 together axially. The Aufweitkonus 5 is pushed onto the pipe end R to and in the same. In this case, the expansion of the pipe end R takes place to the desired extent. It can also be provided a stop for the Aufweitkonus 5, depending on the pipe diameter to limit the expansion process. Depending on the course of the control tracks 83 on the outer surface of the control sleeve 8 while the clamping force on the pipe end R remains constant or is increased. For example, the course of the control tracks 83 may be formed such that the clamping force remains constant after reaching a maximum clamping force. In an alternative Version variant, the clamping force can increase to the end of the axial displacement operation of the control sleeve 8. The degree of increase in the clamping force depends only on the slope of the control tracks 83 at a constant feed rate. If the feed force to the control sleeve 8 and the push rod 6 ends, for example by the plunger of the drive of the hand tool is withdrawn, forces the return spring 9, the control sleeve 8 and the push rod 6 back into their in Fig. 2 illustrated starting position.

In an alternative embodiment of the crimping attachment 1, the control sleeve 8 may also be superimposed by a rotational movement during its axial advance. In this case, the control tracks 83 on the outer surface of the control sleeve 8 on a curved course. You can open into a cylindrical "freewheel" in which an unobstructed rotation of the control sleeve 8 and the push rod 6 is made possible with the Aufweitkonus attached thereto. In such a variant embodiment of the crimping attachment 1, the expander cone 5 can be rotated in addition to its axial feed. This may be advantageous, for example, for expanding the pipe ends of plastic pipes (e.g., PEX pipes) in which the expansion cone must remain in engagement with the pipe end for a period of time to make the pipe end widening permanent.

Fig. 4 shows a mounted on a handset G Bördelaufsatz 1. The handset is, for example, a battery-powered multifunction device that can be used by different essays for other tasks, such as cutting, pressing, connecting by sliding sleeve technology, etc. As the illustration shows, the crimping attachment 1 is connected via an angle adapter W with the handset G, so that it extends in the position of use, for example, substantially horizontally. For reasons of ergonomics closes in a further embodiment of the invention, in Fig. 5 is shown, the longitudinal axis A of the Bördelaufsatzes 1 with a longitudinal axis L of the handset G an angle α of 90 ° to 120 °, preferably from 100 ° to 108 °. Finally, the crimping attachment 1 can also be connected in a vertical position to a handset G, as in the example of FIG Fig. 6 is shown.

Fig. 7 shows, for example, a set of five flare tips 1a, 1b, 1c, 1d, 1e, which is designed for the machining of pipe diameters of 16 mm to 40 mm. The five crimping attachments 1a, 1b, 1c, 1d, 1e have a receiving diameter of 16 mm, 20 mm, 26 mm, 32 mm and 40 mm. In order to distinguish the flanging attachments for different pipe diameters, the individual flanging attachments 1a, 1b, 1c, 1d, 1e of a set can have optical markings. This can be, for example, embossed markings in the housing of a flanging attachment 1a, 1b, 1c, 1d, 1e, which, for example, directly indicate the outside diameter of a respective suitable tube for which the flanging attachment is provided. Alternatively or in addition to this, the flanging attachments 1a, 1b, 1c, 1d, 1e of a set can also be marked differently in color. In this case, for example, the entire outside of the housing may be colored or, as shown, be attached to the housing an annular color coding. The different annular color coding is in Fig. 7 indicated by different hatching of the end ring 13 at the insertion end of the respective Bördeaufsatzes 1a, 1b, 1c, 1d, 1e.

Claims (15)

1. flanging attachment for expanding cylindrical pipe ends (R) for an automatically operable hand tool (G), having an attachment interface (30) for the hand tool (G), having a clamping device for a cylindrical pipe, and having an expansion device, which is able to be fed in axially onto a pipe end (R) of a pipe fastened by the clamping device, in order to expand said pipe to the desired extent, characterized in that the clamping device and the expansion device are coupled together via a coupling member that is displaceable axially to a limited extent and are able to be activated sequentially.
2. Flanging attachment according to Claim 1, characterized in that the clamping device is arranged within a cylindrical housing (2) and has a number of annularly arranged clamping jaws (7) with clamping regions (72) which are able to be fed in radially onto a circumferential surface of the pipe automatically upon introduction of the cylindrical pipe end (R), and in that the expansion device is configured as a substantially conical expansion mandrel (5), which is mounted on a push rod (6) extending substantially coaxially with the annular arrangement of the clamping jaws (7) and is able to be fed in axially onto the pipe end (R) of the fixed pipe, wherein the push rod (6) is arranged in an axially displaceable manner within an axial bore (82) in the coupling member configured as a control sleeve (8), which control sleeve (8) has, on its outer surface, control tracks (83) for radially tilting the clamping jaws (7) and is displaceable to an axially limited extent counter to the restoring force of a restoring spring (9) such that the inserted pipe is fixable via the clamping jaws (7) that are able to be fed in radially, before the expansion mandrel (5) is able to be fed in axially onto the pipe end (R).
3. Flanging attachment according to Claim 2, characterized in that the clamping jaws (7) are mounted in a tiltable manner within the cylindrical housing (2), and their end portions (71) that are remote from the clamping regions (72) interact with the control tracks (83) on the outer surface of the control sleeve (8).
4. Flanging attachment according to Claim 3, characterized in that the end portions (71) of the clamping jaws (7) are loaded by pressure pins (73), the free ends of which form receptacles for rolling bodies (74) which are engaged with the control tracks (83) on the outer surface of the control sleeve (8).
5. Flanging attachment according to one of Claims 2 to 4, characterized in that the control tracks (83) are formed at least regionally on the outer surface of the control sleeve (8) such that, with increasing axial displacement of the control sleeve (8) counter to the restoring force of the restoring spring (9), the clamping force of the clamping jaws (7) is able to be enhanced.
6. Flanging attachment according to one of Claims 2 to 5, characterized in that the control tracks (83) on the outer surface of the control sleeve (8) have one or more regions which are configured such that, after a predetermined clamping force has been reached, upon further axial displacement of the control sleeve (8), the clamping force is able to be kept constant.
7. Flanging attachment according to one of Claims 2 to 6, characterized in that the clamping jaws enclose an angle of about 1° to about 15° with a longitudinal axis (A) of the flanging attachment, such that their clamping regions (72) are open in an approximately V-shaped manner with respect to one another.
8. Flanging attachment according to one of Claims 2 to 7, characterized in that the cylindrical housing (2) is displaceable with respect to the clamping jaws (7) and counter to the restoring force of a tension spring (10) to a limited extent in the direction of the attachment interface (30), wherein an at least regionally circumferential protrusion (22) that projects from an inner surface of the cylindrical housing (2) and pushes against the clamping jaws (7) is displaced and releases the clamping jaws (7), and a positive guide (25, 26, 76) that interacts with the clamping jaws is arranged at the insertion end of the housing (2), the clamping jaws being pushed radially outwards via said positive guide (25, 26, 76) during axial displacement of the housing (2).
9. Flanging attachment according to one of Claims 2 to 8, characterized in that the control sleeve (8) is mounted in a rotatable manner and the control tracks (83) are tracks that are curved on the outer surface thereof.
10. Flanging attachment according to one of Claims 2 to 9, characterized in that the restoring spring (9) and the tension spring (10) are helical compression springs.
11. Flanging attachment according to one of Claims 2 to 10, characterized in that the clamping device comprises at least three clamping jaws (7) and a corresponding number of control tracks (83) are formed on the outer surface of the control sleeve (8) .
12. Flanging attachment according to Claim 11, characterized in that the clamping device comprises six clamping jaws (7) and a corresponding number of control surfaces (83) are formed on the outer surface of the control sleeve (8).
13. Set of flanging attachments according to one of Claims 1 to 12, characterized in that the individual flanging attachments (1a, 1b, 1c, 1d, 1e) are configured in an identical manner and are configured to axially receive pipe ends (R) with different diameters.
14. Set of flanging attachments according to Claim 13, characterized in that it comprises flanging attachments (1a, 1b, 1c, 1d, 1e) for pipe diameters from 4 mm to 63 mm.
15. Set of flanging attachments according to Claim 13, characterized in that it comprises five individual, substantially identically configured flanging attachments (1a, 1b, 1c, 1d, 1e), which have receiving diameters of 16 mm, 20 mm, 26 mm, 32 mm and 40 mm.

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