EP2956254A1

EP2956254A1 - Flanging attachment for expanding cylindrical pipe ends

Info

Publication number: EP2956254A1
Application number: EP14704158.6A
Authority: EP
Inventors: Florian GOOP
Original assignee: Georg Fischer JRG AG
Current assignee: Georg Fischer JRG AG
Priority date: 2013-02-13
Filing date: 2014-02-13
Publication date: 2015-12-23
Anticipated expiration: 2034-02-13
Also published as: ES2701195T3; EP2956254B1; WO2014125025A1; DK2956254T3; CH707604A1

Abstract

The invention relates to a flanging attachment designed to operate with an electrically, pneumatically or hydraulically operable handheld device. Said flanging attachment (1) for expanding cylindrical pipe ends (R) has a connecting interface (30) for the handheld device, clamping devices (7) for a cylindrical pipe end (R) and an expanding device (5, 6). Said expanding device (5, 6) is axially adjustable towards the pipe end (R) of a pipe end (R) fixed by the clamping device (7) in order to expand it to the desired extent. According to the invention, the clamping device (7) and the expanding device (5, 6) are coupled to one another by means of a coupling element (8) which can be axially displaced in a limited manner and which can be sequentially activated. The invention also relates to a set of flanging attachments for expanding the pipe ends having different diameters.

Description

The invention relates to a crimping attachment for widening cylindrical pipe ends for an automatically operable hand tool according to the preamble of claim 1. The invention also relates to a set of such crimping attachments for different pipe diameters. For the production of detachable pipe connections, so-called flare fittings 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 state of the art, a large number 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 already known hand tools for flanging thin Kupierrohren with diameters up to% inches. These handsets are each designed for a single pipe diameter. There are also hand-held devices available which feature a special clamp. equipped and must be retrofitted for different pipe diameters.

In US Pat. No. 4,831,855 a crimping device is described which can be designed as an attachment which can be fastened to an electrically driven hand drilling device. The adapter has two plate-shaped clamping jaws, between which a tube can be clamped. For this purpose, the two plate-shaped clamping jaws can be screwed together or clamped together via other clamps. 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. The advance of the attached to the threaded rod crimp egg sens is indeed given by the steepness of the thread of the threaded bore and 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 flaring iron is driven to a stop during operation, this can damage the flaring 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 a crimping attachment for widening cylindrical tube ends for an automatically operable handset are created, 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 changeover for different pipe diameters should be avoided.

The solution to these problems consists in a crimping attachment for expanding cylindrical tube ends for an automatic hand-held device, which has the features mentioned in the characterizing portion of claim 1. Further developments and / or advantageous embodiments of the invention are 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 an opening 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 to one another via a limited axially displaceable coupling member and activated sequentially. By the clamping device and the expander are coupled together, eliminates the cumbersome clamping of the tube in the clamping device before the actual Autweitvorgang 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 is effected by means of the electrically, pneumatically or hydraulically operable drive unit, preferably with a handset, with which the crimping tower is connected via its Anbindeschnittstelle. The pipe end is thus widened by machine. This eliminates physical effort, as required for example in the operation of known crimping pliers. In a first exemplary embodiment of a concrete implementation of the general inventive idea underlying the proposed crimping attachment is the

Clamping device disposed within a cylindrical housing. The clamping device has a number of ring-shaped 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 is fixable on the radially deliverable jaws before the expanding mandrel is axially deliverable to the tube end.

The control sleeve, the pushrod guided in the bore of the control sleeve with the Aufweitdom 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 over 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 Bördel essay 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. This will also the

Push rod retracted with the expansion cone, and the jaws give that

Tube free again with the tube end widened to the desired extent, so that it can be pulled out of the crimping attachment. An embodiment 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 structural design allows the transfer of clamping forces to the desired extent on the tube end inserted into the attachment. 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 of the invention, the end portions of the jaws are loaded by pressure pins whose free ends preferably form receptacles for rolling elements engaged with the control tracks on the outer surface of the control sleeve, the jaws can very reliably control the course of control consequences. A function of the detrimental friction of the interacting components can be largely avoided.

In a further simplified embodiment variant can be dispensed with the control tracks and rolling elements, wherein the force is transmitted via the pressure pin directly on the outer surface of the control sleeve on the jaws. 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 beading attachment 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 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 sleeve may have one or more regions which are designed in such a way that after reaching a predetermined clamping force at a further axial Moving the control sleeve, the clamping force is constant durable. 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. In this case, it can also be provided that the expansion cone remains in engagement with the tube end over a relatively long period of time so that an elastic regression 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 clamping jaws via the control tracks arranged on the outer surface of the control sleeve, the axial displacement of the control sleeve can also actuate a trigger which activates a hydraulic actuating mechanism for the clamping 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 clamping jaws and against the return can be displaced in the direction of the Anbinde- interface limited force of a tension spring. A protruding from an inner surface of the cylindrical housing and at least area wise circumferential projection which normally presses on the jaws is thereby displaced and releases the jaws. At the insertion end of the housing a cooperating with the clamping jaws Zwangsluh- tion is arranged, via which the clamping jaws are pressed radially outward 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 relative to the longitudinal axis of the Bördelaufsatzes by an angle of about 1 ⁰ 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 can also be accompanied by a rotary component. In such an embodiment variant of the crimping attachment according to the invention, 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, cone springs, leaf springs etc.

An embodiment variant of the invention can provide that the clamping device of the crimping element comprises at least three clamping jaws and a corresponding number of control tracks are formed on the outer surface of the control sleeve. With at least three jaws a pipe is already reliably fixed.

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

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 Aufweitdom.

For processing, in particular for the expansion, of pipes with different outside diameters, a set of Bördelaufsätzcn is provided. The flare attachments are each designed in accordance with one of the presented variations. 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 known from the prior art flaring a separate flaring device is therefore not required for each pipe diameter. The hand-held device can also be a universal hand-held device, which apart from the beading attachment also with other attachments for further processing steps, such as. Cutting, pressing, joining 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 tips 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 flare attachments for different outer diameters of a set of flare attachments, the individual flare tips for different pipe diameters can be distinguished from one another by optical characteristics. For example, a set of crimping sets can provide different color identifiers for the individual crimping sets for different pipe diameters, which are preferably attached to 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 color Kennzei chapters, the individual crimping attachments of a set may also have embossed in the housing markings that indicate, for example, immediately the outer diameter of a suitable pipe, etc. 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 is an exploded perspective view of a crimping attachment;

FIG. 2 is an axial sectional view of a crimping attachment in the initial situation; FIG. 3 shows an axial section of the crimping attachment according to FIG. 2 with a tube inserted and already expanded tube end; FIG.

FIGS. 4 and 5 are perspective views of two embodiments of a crimping attachment connected to a hand-held device;

Fig. 6 is a side view of another A game playing game played on a hand tool Bördclaufsatzes; and

Fig. 7 is a perspective view of a set of Bördelaufsätzen for different pipe diameters.

While the illustration shows all the components of this embodiment from an anvil flare essay, the following description is limited to those components that are essential for the understanding of the invention substantially. An example shown in Fig. 1 crimping attachment for expansion of cylindrical pipe ends are. The Bördel au paragraph 1 has a cylindrical housing 2, in which all components required for the function of the Bördelaufsatzes are accommodated. The cylindrical housing 2 encloses a guide part 3 with a connection interface 30 for the connection of the crimping attachment 1 to an electrically, pneumatically or hydraulically operable handheld device, respectively. 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, for example, as a

Be formed screw thread. The guide member 3 has a central axial bore 4, which receives a widening device comprising an expansion cone 5, which is connected via a B e festi supply screw 61 with a push rod 6. A plurality of clamping jaws 7 of a clamping device for a pipe to be flared are arranged in the form of a ring around the guide part 3 and are tiltably supported 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 screw pressure spring, is supported in an annular extension (not visible) of the central axial bore 4 of the guide part 3 and on a peripheral flange 81 on the end of the control sleeve 8 facing away from the guide part 3. 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 1 1, whose function will be explained in more detail below, cooperates with jaws 7.

The cylindrical housing 2 of the crimping attachment is grouped relative to the guide part 3 and the expanding device received therefrom or annularly around it

Clamping jaws 7 of the clamping device mounted axially displaceable. 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 gegenüberl i egen de end of the tension spring 10 is supported on a radial extension 33 of the guide member 3 from. By relatively moving 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 an expanded pipe end to remove. At the insertion end of the axially displaceable housing 2 in engaging 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 engagement pin 26 in the slot guides 76th in the direction of their end portions 71. 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 can be dispensed with the positive guidance of the jaws 7 and springs by means of pressure between the individual jaws 7 can be achieved that the jaws 7 are pressed outwards and opened. FIG. 2 shows an axial section of the assembled 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 Aufkonkonus 5 in its retracted position. As shown, the flange 81 and a part of the restoring spring 9 can protrude from the connection interface 30. The end of the control sleeve 8 provided with the flange 81 projects beyond the end

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 on the outer surface of the Steuerhülsc 8. In particular, they are each at one Inlet of the control track 83, which preferably has only a slight slope. 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 part 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 about 1 ° to 15 ° with the longitudinal axis of the Bördclaufsatzes 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 in the crimping tower. 1 Fig. 3 shows the hemming 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 widening cone 5 fastened to it are in their final 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. When axially advancing the control sleeve 8 (in Fig. 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 may 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 Außenfiäche the control sleeve 8 while the clamping force remains constant on the pipe end R 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 starting position shown in FIG.

In an alternative embodiment variant 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. They can open into a cylindrical "freewheel", in which an unimpeded rotation of the control sleeve 8 and the push rod 6 is made possible with the expansion cone 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 Akku-betricbcnes multi-functional 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 schiicsst in a further embodiment of the invention, which is shown in Fig. 5, 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 ° one. Finally, the crimping attachment 1 can also be connected in a vertical position to a hand-held device G, as shown by the example of FIG. 6.

FIG. 7 shows, for example, a set of five flanging attachments 1 a, 1 b, 1 c, 1 d, 1 e, which is designed for processing pipe diameters of 16 mm to 40 mm. The five boarder Traces la, lb, lc, ld, 1 e have recording diameters of 16 mm, 20 mm, 26 mm, 32 mm and 40 mm. In order to distinguish the flare attachments for different pipe diameters, the individual flanging attachments 1 a, 1 b, 1 c, 1 d, 1 le of a set can have optical markings. This can be, for example, embossed markings in the housing of a pommel attachment 1a, 1b, 1c, 1le, which, for example, directly indicate the outer diameter of a respectively suitable tube for which the crimping attachment is provided. As an alternative or in addition to this, the flanges can also be marked in different colors according to la, lb, lc, ld, le of a set. In this case, for example, the entire outside of the housing may be colored or, as shown, an annular color coding may be attached to the housing. The different annular color coding is indicated in Fig. 7 by different hatching of the end ring 13 at the insertion end of the respective Bördeaufsatzes la, lb, lc, ld, le.

Claims

Claims 1. Flaring attachment for expanding cylindrical pipe ends (R) for an automatically operated hand-held device (G), with a connection interface (30) for the hand-held device (G), with clamping devices for a cylindrical tube and with an expanding device that is axially applied to a tube end (R) of a pipe fixed by the clamping device can be delivered in order to expand it to the desired extent, characterized in that the clamping device and the expanding device are coupled to one another via a limited axially displaceable coupling member and can be activated sequentially.

2. Flaring attachment according to claim 1, characterized in that the clamping device is arranged within a cylindrical housing (2) and has a number of circularly arranged clamping jaws (7) with clamping areas (72), which when the cylindrical pipe end (R) is inserted. can be automatically delivered radially onto a jacket of the pipe, and that the expanding device is designed as a substantially conical expanding mandrel (5), which is mounted and axially mounted on a push rod (6) which runs essentially coaxially to the annular arrangement of the clamping jaws (7). the pipe end (R) of the fixed pipe can be adjusted, the push rod (6) being arranged axially displaceably within an axial bore (82) of the coupling member designed as a control sleeve (8), which control sleeve (8) has control tracks (83) on its outer surface ) for radial tilting of the clamping jaws (7) and can be axially displaced to a limited extent against the restoring force of a restoring spring (9) in such a way that the inserted pipe can be fixed via the radially adjustable clamping jaws (7) before the expanding mandrel (5) is axially applied to the pipe end (R) can be delivered.

Flaring attachment according to claim 2, characterized in that the clamping jaws (7) are tiltably mounted within the cylindrical housing (2) and their end sections (71) facing away from the clamping areas (72) are connected to the control tracks (83) on the outer surface of the control sleeve ( 8) work together.

4. Flaring attachment according to claim 3, characterized in that the end sections (71) of the clamping jaws (7) are loaded by pressure bolts (73), the free ends of which form receptacles for rolling elements (74) which engage with the control tracks (83). the outer surface of the control sleeve (8).

5. Flaring attachment according to one of claims 2 to 4, characterized in that the control tracks (83) on the outer surface of the control sleeve (8) are at least partially designed in such a way that with increasing axial displacement of the control sleeve (8) against the return position The clamping force of the clamping jaws (7) can be increased by means of the return spring (9).

6. Flaring 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 areas which are designed such that after reaching a predetermined clamping force during further axial displacement the control sleeve (8) keeps the clamping force constant.

7. Flaring attachment according to one of claims 2 to 6, characterized in that the clamping jaws form an angle of approximately 1° to approximately 15° with a longitudinal axis (A) of the flanging attachment, so that their clamping areas (72) open to one another in an approximately V-shape stand.

8. Flaring attachment according to one of claims 2 to 7, characterized in that the cylindrical housing (2) can be displaced to a limited extent in the direction of the connection interface (30) relative to the clamping jaws (7) and against the restoring force of a tension spring (10), whereby a a projection (22) protruding from an inner surface of the cylindrical housing (2) and running around at least in some areas, which presses on the clamping jaws (7), is displaced and releases the clamping jaws (7), and at the insertion end of the housing (2) one with the clamping jaws cooperating positive guide (25, 26, 76) is arranged, via which the clamping jaws are pressed radially outwards when the housing (2) is axially displaced.

9. Flaring attachment according to one of claims 2 to 8, characterized in that the control sleeve (8) is rotatably mounted and the control tracks (83) are curved tracks on their outer surface.

10. Flaring attachment according to one of claims 2 to 9, characterized in that the return spring (9) and the tension spring (10) are helical compression springs.

11. Flaring attachment according to one of claims 2 to 10, characterized in that the K 1 em m device comprises at least three clamping jaws (7) and a corresponding number of control tracks (83) is formed on the outer surface of the control sleeve (8).

12. Flaring attachment according to claim 1 1, characterized in that the clamping device comprises six clamping jaws (7) and a corresponding number of control surfaces (83) is 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 (l a, 1 b, lc, ld, 1 e) are designed in the same way and are used to axially accommodate pipe ends (R) with different ed 1 i Chen diameters are formed.

14. Set of flaring attachments according to claim 13, characterized in that it comprises flaring attachments (la, lb, l c, l d, le) 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, essentially identically designed flanging attachments (la, l b, l c, ld, l e), the receiving diameters of 16 mm, 20 mm, 26 mm, 32 mm and 40 mm.