EP3119539B1 - Shaping tool for a workpiece, and device for deforming a workpiece using such a tool - Google Patents

Description

The present invention relates to a device for deforming a workpiece with a forming assembly which can be actuated by the pressure of a fluid and with a clamping assembly which is arranged on a common longitudinal axis and can be actuated by the pressure of the fluid.
A forming tool for a workpiece, in particular for the plastic forming of a pipe end, is used therein, with a clamping device for the workpiece comprising a plurality of clamping segments and with an upsetting head, which in particular has a recess on one side for forming a contour of the workpiece and on the opposite Side has a fastener for connection to a forming piston of a device for deforming the workpiece.
A forming tool and a device of the type mentioned are from the EP 1 494 827 B1 known. This document describes a device for shaping workpieces, in particular for plastically shaping pipe ends, with a shaping assembly actuated by the pressure of a fluid - referred to there as the shaping unit - and with a clamping assembly arranged on a common longitudinal axis and actuated by the pressure of a fluid - there referred to as a biasing unit - wherein conical clamping elements are provided for the workpiece. A tool set is used for the reshaping, which consists of a swaging head as swaging tool and of a clamping device to which the clamping elements belong. The upsetting head contains one on one side Well, which forms a counter contour of the pipe contour to be shaped, and on the opposite side a fastening means, which at a corresponding connection point of a piston of the forming assembly, for. B. can be attached in a T-slot. The clamping device is formed in particular from a plurality, preferably four, ring-shaped segments which function as clamping jaws. These are usually guided over cylindrical pins and held in an open position in the unloaded state by means of compression springs arranged between them. They cooperate with a conical surface in an opening of a yoke plate of the forming assembly of the forming device and also have conical outer surfaces for this purpose. With their mostly slightly roughened or toothed inside, the clamping jaws press on the tube when clamping.

For the technologically important step of the tool change is mentioned in the EP 1 494 827 B1 explained that advantageously it is not necessary to disassemble device components for tool change and that in a tool change position the tools - compression head and clamping device - can be inserted from above into corresponding receptacles of the forming device, with good access to the tool space.

In detail, when changing tools - which is not described in the document mentioned, but is known from a device for deforming a workpiece that is on the market - the process of tool changeover can be characterized in a structurally simple design by the following steps: her cylindrical, the upsetting head and the clamping jaws in their working position surrounding the housing of the forming device by pulling by hand, inserting or changing the clamping device, inserting or changing the upsetting tool, z. B. by inserting into the T-slot, closing the tool change slide valve by pushing it shut by hand.

The process represents an already optimized variant of a comparatively more complex known process of tool retrofitting, for example in a device according to the EP 1 311 358 B1 is practical and, in particular to ensure a high level of assembly security, comprises the following steps: screwing on a housing of the forming device for the forming head and the clamping jaws, which is of truncated cone shape, inserting or changing the clamping device, screwing in or changing the upsetting tool using a special key, resealing and screwing the housing. There is a risk that the jaw segments will fall apart since they are usually held together only by a rubber ring during assembly. In addition, the change is time-consuming due to the required use of tools.

A disadvantage of both variants is that due to the space required for the tool change, the forming area is relatively large, which leads to restrictions on the possible bending geometries of a pipe to be formed, and that there is a risk of confusion between pairs of upsetting heads and clamping devices that are assigned to one another.

The DE 100 40 595 A1 describes a generic device and a method for reshaping an end region of a workpiece, in particular for cold press-reshaping a tube end region, wherein a first hydrodynamically actuatable force transmission element for clamping the workpiece and a second hydrodynamically actuated force transmission element, by the force action of which the reshaping is achieved, are provided. The shaping device in its specific embodiment has a two-part housing which is formed from a base housing and from a receiving housing. The base housing has a central cylindrical bore in which an outer piston and an inner piston are guided. A compression tool can thus be connected via a rotary lock. The receiving housing forms a receiving space for clamping jaws, which can be actuated by actuating the outer piston. The assembly of the forming tool is not described in detail, but appears to be complex from an assembly point of view when analyzing the drawing figures.

Also the US 5,134,872 A describes a generic hydraulic tensioning device for expanding a pipe end. The device has a pipe receiving end into which the pipe to be expanded is inserted. A chuck contains a main piston which can be moved back and forth under the action of the fluid in the direction of the pipe receiving end. At one end of the main piston there is a ball attached by a screw to expand the pipe. The collets are located within a housing and are driven by an actuator, which in turn is screwed to a hollow actuating piston, in the interior of which the main piston slides. For this device too, the assembly and disassembly effort appears disadvantageously large due to the large number of individual parts to be connected to one another.

The British patent application GB 2 352 665 A relates to a compression tool, in particular for providing a compression end on a pipe in order to provide a connection for an extension piece. In order to attach such an extension piece to a pipe on site, a portable tool must first be brought to the pipe. In the case of such portable tools, a point load was used prior to the registration of the property right in order to secure the pipe against movement during the upsetting, the point load frequently damaging the pipe itself. The task associated with the subject of GB 2 352 665 A was to avoid this disadvantage. To achieve this object, a construction is described which has a housing with a bore at one end of the housing, which leads to a cavity which extends to the opposite end of the housing, and a cap. Furthermore, a clamping device is provided at the end of the housing in its cavity, which is suitable for holding a pipe or a line in one position in order to produce a compressed end thereon. In addition, a recess is provided in the clamping device, which cooperates with the pipe or line end when it is inserted through the clamping device, and which enables the formation of the compressed end. Finally, the tool comprises an upsetting element which interacts with the cap and with the end of the pipe or the line engages, whereby the compressed end is made at the end of the pipe or the line.

The present invention has for its object to provide a device of the type mentioned, which are characterized by a low assembly effort for a tool change while ensuring a high level of assembly security and avoid the disadvantages of the prior art described above.

According to the invention, this is achieved by a device according to claim 1.

Overall, therefore, according to the invention, it is a device for deforming a workpiece with a forming assembly which can be actuated by the pressure of a fluid and with a clamping assembly which is arranged on a common longitudinal axis and can be actuated by the pressure of the fluid, the device being characterized by an exchangeable tool unit and by a cylinder unit which is designed as a preassembled unit which can be handled separately from the interchangeable tool unit, the interchangeable tool unit being a shaping tool for the workpiece, which is arranged on the common longitudinal axis of the shaping assembly and the clamping assembly, and a clamping device with a plurality of clamping segments for the workpiece and comprises an upsetting head, which on one side has a recess for forming a contour of the workpiece to be formed and on the opposite side a fastening means for connection to a forming piston of the U mform assembly, wherein the upsetting head and the clamping device in the forming tool forming the tool unit are axially movable relative to each other in a constructive manner and the cylinder unit is formed with a housing or at least with a housing part and comprises the forming piston which is axially movably guided in a piston space is.

It is thus provided as an important feature that the upsetting head and the clamping device of the forming tool are axially movable relative to one another in one single tool unit are structurally connected to each other. Furthermore, in the device according to the invention, the forming tool is arranged on the common longitudinal axis of the forming assembly and clamping assembly.

The assembly or a tool change in the deformation device according to the invention is very simple, in that the tool unit comprising the upsetting head and the clamping device is assembled or replaced as a whole in or on a complementary cylinder unit. The cylinder unit is preferably designed as a preassembled unit with a housing or at least with a housing part that can be handled separately from the forming tool and comprises at least one forming piston which is guided in an axially movable manner in a piston chamber. For connection to the tool unit comprising the upsetting head and the clamping device, the cylinder unit has a tool holder, which in turn is connected to the forming piston via suitable connecting means, for example via one or more screws.

The advantage of the invention is, in addition to a simplified process of the tool change, the avoidance of a risk of confusion of parts that belong to one another in pairings, in particular in terms of size relative to the pipe geometry, such as the outside and inside diameter of the pipe, selectable associated clamping segments and upsetting heads. Another advantage is the possibility of designing the forming tool unit according to the invention in an extremely compact design, which makes it possible to realize a larger number of possible geometries in the case of tube forming.

As far as the axial mobility of the upsetting head and clamping device is concerned, this can be done e.g. B. consist in that both parts are axially movable, but in particular also in that only the upsetting head is axially movable, the clamping device, in particular its clamping segments, at least in each case to have a radial mobility to perform its function.

Further advantageous design details and shapes of the forming tool unit according to the invention, formed from the upsetting head and the clamping unit structurally connected to it, and the forming device according to the invention with this forming tool unit are contained in the dependent claims and the following description.

Fig. 1

eine perspektivische Darstellung einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung vor der Montage eines erfindungsgemäßen Umformwerkzeugs,

Fig. 2

in einer Fig. 1 entsprechenden perspektivischen Darstellung, eine erste Ausführungsform des erfindungsgemäßen Umformwerkzeugs vor der Montage an der erfindungsgemäßen Vorrichtung in ihrer ersten Ausführung nach Fig. 1,

Fig. 3

eine weitere perspektivische Darstellung der in Fig. 2 dargestellten, ersten Ausführungsform des erfindungsgemäßen Umformwerkzeugs, jedoch aus anderem Blickwinkel,

Fig. 4

einen Längsschnitt durch die erste Ausführungsform einer erfindungsgemäßen Vorrichtung in ihrer Montageposition für das Umformwerkzeug,

Fig. 5

einen Längsschnitt durch die erste Ausführungsform einer erfindungsgemäßen Vorrichtung in ihrer Arbeitsposition,

Fig. 6

in einer ähnlichen perspektivischen Darstellung wie in Fig. 2, eine zweite Ausführungsform des erfindungsgemäßen Umformwerkzeugs vor der Montage an der erfindungsgemäßen Vorrichtung in ihrer zweiten Ausführung nach Fig. 7,

Fig. 7

in einer perspektivischen Darstellung, die zweite Ausführungsform des erfindungsgemäßen Umformwerkzeugs nach Fig. 6 bei der Montage in der erfindungsgemäßen Vorrichtung in der zweiten Ausführung,

Fig. 8

in der Vorderansicht, einen Längsschnitt durch die zweite Ausführungsform einer erfindungsgemäßen Vorrichtung bei Vorliegen der Montageposition des erfindungsgemäßen Umformwerkzeugs,

Fig. 9

in einer Fig. 8 entsprechenden Draufsicht, einen weiteren Längsschnitt durch die zweite Ausführungsform einer erfindungsgemäßen Vorrichtung bei Vorliegen der Montageposition des erfindungsgemäßen Umformwerkzeugs,

Fig. 10

in einer Darstellung wie in Fig. 9 einen Längsschnitt durch die zweite Ausführungsform einer erfindungsgemäßen Vorrichtung bei Vorliegen der Arbeitsposition des erfindungsgemäßen Umformwerkzeugs.

The invention will be explained in more detail below with the aid of two preferred exemplary embodiments. Show:

Fig. 1

2 shows a perspective illustration of a first embodiment of a device according to the invention before the assembly of a forming tool according to the invention,

Fig. 2

in a Fig. 1 corresponding perspective view, a first embodiment of the forming tool according to the invention before assembly on the device according to the invention in its first embodiment Fig. 1 ,

Fig. 3

another perspective view of the in Fig. 2 illustrated first embodiment of the forming tool according to the invention, but from a different perspective,

Fig. 4

2 shows a longitudinal section through the first embodiment of a device according to the invention in its assembly position for the forming tool,

Fig. 5

2 shows a longitudinal section through the first embodiment of a device according to the invention in its working position,

Fig. 6

in a perspective view similar to that in Fig. 2 , a second embodiment of the forming tool according to the invention before mounting on the device according to the invention in its second embodiment Fig. 7 ,

Fig. 7

in a perspective view, the second embodiment of the forming tool according to the invention Fig. 6 when installed in the device according to the invention in the second embodiment,

Fig. 8

in the front view, a longitudinal section through the second embodiment of a device according to the invention when the assembly position of the forming tool according to the invention is present,

Fig. 9

in a Fig. 8 corresponding top view, a further longitudinal section through the second embodiment of a device according to the invention when the assembly position of the forming tool according to the invention is present,

Fig. 10

in a representation like in Fig. 9 a longitudinal section through the second embodiment of a device according to the invention when the working position of the forming tool according to the invention is present.

In the following description, it is expressly emphasized that the invention is not limited to the exemplary embodiments and also not to all or more features of the combinations of features described.

In the various figures of the drawing, the same parts are always provided with the same reference symbols and are therefore generally only described once below in the following.

As at first Fig. 1 , but then also in particular Fig. 4 and 5 for a first embodiment of the invention, a device 1 according to the invention for deforming a workpiece 2, which - as in FIG Fig. 5 shown - can preferably be a tube, a forming assembly actuated by the pressure of a fluid F and a clamping assembly arranged on a common longitudinal axis XX and actuated by the pressure of the fluid F.

Different components are assigned to the two modules according to their function, which are described in more detail below. Some of these components are located in a forming tool 3 designed according to the invention as a single tool unit ( 2, 3 ) and partially in a cylinder unit 4 ( Fig. 1 ), which receives the forming tool 3 according to the invention after its assembly and forms the forming device 1 according to the invention together with it.

With reference to Fig. 4 and 5 the following components can be assigned to each of the two assemblies.

The forming assembly comprises, as the main component, a forming piston 5 arranged in the cylinder unit 4, which is longitudinally displaceable under the pressure of a fluid F in a forming piston space 6 along the longitudinal axis X-X. The forming piston 5, as can be seen from the drawing, is designed as a stepped solid cylinder.

Furthermore, the forming assembly comprises a tool holder 7, likewise arranged in the cylinder unit 4, which is connected to the forming piston 5, in particular via a cylinder head screw 8.

Finally, the forming assembly comprises a compression head 9 belonging to the forming tool 3 according to the invention. This compression head 9 has, in particular on one end face, a depression 10 for forming a contour of the workpiece 2 to be shaped and on the opposite side a fastening means 11 for in the case shown, indirect connection to the forming piston 5 via the tool holder 7. The basic shape of the upsetting head 9 is preferably also fully cylindrical. The fastening means 11 is formed in that the upsetting head 9 has a circumferential groove 12, so that its contour is T-shaped in the region of its end face, as seen in longitudinal section. With this T-shaped fastening means 11, the upsetting head 9 can engage in a corresponding — ie, shape-adapted — T groove 13 of the tool holder 7. The groove 13, which is open towards the top and is axially delimited by a web 13a, extends - as best of all Fig. 1 can be seen - circumferentially over such an angular range of the tool holder 7 over 180 ° that on the one hand an insertion of the fastening means 11 into the groove 13 is possible without any problems, but on the other hand it is positively held in the groove 13 after its insertion.

When the shaping piston 5 executes an axial movement serving the purpose of shaping the workpiece 2 under the pressure action of the fluid F, all moving parts of the shaping assembly move axially towards the workpiece 2, i.e. with the piston 5 via the cylinder head screw 8 thereon attached tool holder 7 and finally the upsetting head 9.

The main component of the tensioning assembly is a tensioning piston 15 which is arranged in the cylinder unit 4 and which is longitudinally displaceable under the pressure of the fluid F in a tensioning piston space 16 along the longitudinal axis X-X. The tensioning piston 15 is - as can be seen from the drawing - designed as a radially stepped ring cylinder on the outside and inside. The clamping piston 15 circumferentially surrounds the end of the shaping piston 5 which is arranged concentrically with the workpiece 2 and also the tool holder 7 connected to it and is relatively movable with respect to these parts 5, 7.

The tensioning piston chamber 16 can be acted upon by the fluid F separately from the shaping piston chamber 6 via a fluid inlet 16a, in contrast to which the shaping piston chamber 6 has two fluid entry points 6a, 6b has - a first fluid entry point 6a for initiating the forming movement and a second fluid entry point 6b for initiating the return movement of the forming piston 5.

The tensioning piston 15 does not need to be acted upon by the fluid F to drive its return movement, since it is carried along via a radially inner step 15a when the shaping piston 5 moves back with the tool holder 7 attached to it, and this step 15a axially on a radial projection 7a the tool holder 7 comes to a stop in relation to the forming piston 5.

Furthermore, the clamping assembly comprises a clamping device 17 belonging to the forming tool 3 according to the invention, which comprises a plurality of clamping segments 18 arranged in a ring. The clamping device 17 can preferably have four annularly arranged segments 18, which function as clamping jaws which, as is known per se, can preferably be held in an open position in the unloaded state by means of pressure springs arranged between them and not shown in the drawing.

Finally, the clamping assembly comprises a retaining ring 19, which is also associated with the forming tool 3 according to the invention, at one axial end of which the clamping device 17 rests on its end face, while at its other axial end the upsetting head 9 is axially displaceable, but cannot be lost in the ring interior by this movement being limited on both sides is held. The stops are formed on one side of the upsetting head 9 on the one hand by a radially inner circumferential edge web 19a of the retaining ring 19 and on the other hand by a complementary outer circumferential edge web 9a of the upsetting head 9, and on the other side of the upsetting head 9 on the one hand by a Bottom surface 18a of the clamping segments 18 and, on the other hand, through an annular surface 9b of the upsetting head 9 surrounding the recess 10 to form the workpiece contour.

When the clamping piston 15 executes an axial movement serving the purpose of clamping the tool 2 under the pressure action of the fluid F, all moving parts of the clamping assembly move towards the workpiece 2, i.e. with the piston 15 of the retaining ring 19 and finally the clamping device 17th

The parts of the forming assembly and the parts of the clamping assembly of the device 1 according to the invention are surrounded by a housing 20 which, in the first embodiment, is of multi-part design and interacts with the parts of the forming assembly as well as the parts of the clamping assembly.

Thus, the housing 20 in the cylinder unit 4 forms the wall for the forming piston space 6, in which the two fluid entry points 6a, 6b are located, by means of a first hollow-cylindrical housing part 20a. In addition, the housing 20 in the cylinder unit 4 forms the wall for the tensioning piston chamber 16 by means of the first housing part 20a, the fluid inlet 16a of the tensioning piston chamber 16 being located therein.

In the tool unit 3, the housing 20 forms the wall of the tool unit 3 by means of a second housing part 20b, which is hollow-cylindrical in a first axial section and a hollow truncated cone in a second, adjoining the first tip section. The frustoconical section tapers conically. both inside and outside - pointing the way from the cylinder unit 4. The clamping segments 18 of the clamping device 17 each have a corresponding conical surface 18b on the outside, which bears against the inner conical surface 21 of the second housing part 20b and interacts with it. With an axial pressure on the bottom surfaces 18a of the clamping segments 18, these move on the one hand in the axial direction XX, on the other hand, they are pressed radially inwards by the wedge action of the two surfaces 18b, 21, whereby they are roughened or toothed inside 18c when clamping as Clamping jaws on workpiece 2, like that in Fig. 5 shown pipe end, press.

It is clear from this that the housing 20 is preferably also important for the fulfillment of the tensioning function of the tensioning assembly.

In addition, the second housing part 20b of the housing 20 advantageously fulfills a function with regard to the fact that the upsetting head 9 and the clamping device 17 are structurally connected to one another in a single tool unit 3. From this point of view, it has already been stated in the description of the clamping assembly that the upsetting head 9 is axially displaceable in the interior of the retaining ring 19, but is captive with a stop limitation on both sides. This assembly of upsetting head 9 and retaining ring 19, together with the tensioning device 17, which is preferably not firmly connected to the retaining ring 19, is initially held in a form-fitting manner in the second housing part 20b. The retaining ring 19 is also by a fastening element 22, in particular by an in Fig. 4 and 5 Grub screw shown, which engages with its tip in an outer groove 23 of the retaining ring 19, held longitudinally displaceably in the housing part 20b. The axial length of the outer groove 23 is dimensioned such that the retaining ring 19 can carry out the axial movement necessary for tensioning or relaxing, the fastening element 22 being guided in the outer groove 23 in a manner limited by stops. In this way, the structural cohesion of the forming tool 3 is given, on the one hand, but on the other hand, it also ensures its reliable function.

Finally, in the first embodiment of the device 1 according to the invention, the housing 20 has a third housing part 20c which serves to connect the tool unit 3 and the cylinder unit 4 to one another. The housing part 20c is designed in the manner of a union nut, it having an internal thread 24 through which a screw connection 24, 25 can be produced with a circumferential external thread 25 of the cylinder unit 4, as shown in FIG Fig. 5 is shown. Corresponding collars 26, 27, which come into contact with one another during assembly, press the tool unit 3 and the cylinder unit 4 axially against one another and are thus connected to one another.

A tool change is thus very simple, in that only one tool unit 3 is unscrewed from the cylinder unit 4 and removed from the T-slot 13. Another tool unit 3 can then be reinserted into the T-slot 13 in the next step and screwed onto the cylinder unit 4. How 2 and 3 show, special engagement points 28 for a screwing tool can be provided for this purpose on the third housing part 20c.

Even with the in 6 to 10 The illustrated second embodiment of the invention comprises a device 1 according to the invention for deforming a workpiece 2, a forming assembly actuated by the pressure of a fluid F and a clamping assembly arranged on a common longitudinal axis XX and actuated by the pressure of the fluid F, as described above for the first embodiment has been.

In the second embodiment of the invention, the shaping tool 3 according to the invention also has a clamping device 17 for the workpiece 2 with a plurality of clamping segments 18 and an upsetting head 9, which is used to form the contour of the workpiece 2 to be shaped. The upsetting head 9 and the clamping device 17 are structurally connected to one another in a single tool unit 3 so that they can move axially relative to one another.

The first difference is in the design of the housing 20, which in the second embodiment is initially shown in simplified form, as the uniform cross-hatching shows. Specifically, however, this housing 20 must consist of at least two components (in Fig. 5 two separating points T1, T2 are provided in the housing 20, that is to say three housing parts), these parts of the housing 20 being screwed together (dash-dotted, axially parallel lines in FIG Fig. 5 ) and cannot be separated from each other when changing tools. It therefore does not - as in the first embodiment - consist of parts 20a, 20b, 20c which can be connected to one another and can be detached for tool change, one of which is assigned to the tool unit 3 and another to the cylinder unit 4. Instead, the housing 20, which here can be completely assigned to the cylinder unit 4, has at least one window 30, which allows a tool change remove one tool unit 3 from the cylinder unit 4 and reinsert the other. How special Fig. 7 can be seen very clearly, two diametrically opposite windows 30 are provided in the case shown. Each window 30 is formed by a recess in the jacket of the hollow cylindrical housing 20. The tool change can thus advantageously be implemented without the need to use additional tools.

Since, in the second embodiment, the tool unit 3 of the forming tool 3 according to the invention is not held together by means of a housing part 20b - in particular not the unit comprising the upsetting head 9 and retaining ring 19 with the segments 18 of the clamping device 17 loosely inserted into the housing part 20b - a connection is instead made between them the retaining ring 19 and the segments 18 are provided, in particular as a non-positive and positive connection 8 to 10 becomes clear. For this purpose, the retaining ring 19 has an inner circumferential groove 19b in the region of its axial end facing away from the upsetting head 9, in which the segments 18 are held in a form-fitting manner with a complementary flange shoulder 18d. By means of the compression springs, not shown, arranged between the segments 18, the segments 18 are pressed centrifugally into the circumferential groove 19b. To insert or remove the clamping device 17, the segments 18 can be pressed radially inward against the spring force, so that the outside diameter of the clamping device 17 is reduced and this can be inserted into the retaining ring 19b or removed therefrom. However, this is only necessary when producing the pre-assembled forming tool unit 3 or in the event of wear of the segments 18 after a long period of use, not when changing the tool in an inventive device 1 for shaping. This connection is structurally simpler than the cohesion through the housing part 20b in the first embodiment, in which an additional screw connection is provided with the grub screw. Compression head 9 and retaining ring 19 are connected to one another in the same way as in the first embodiment.

Due to the possibility of inserting the tool unit 3 into the cylinder unit 4, the tool change in the second embodiment is easier than in the first embodiment. However, since the conical tip section of the housing 20, which is involved in the clamping of the workpiece 2, is not to be grasped by the window 30, but rather the window 30 only begins directly behind the conical section in the axial direction, this results in a somewhat greater axial overall length of the device according to the invention 1 in its second version. After inserting the tool unit 3 into the cylinder unit 4 ( Fig. 8 , 9 ) the device 1 according to the invention is first brought into a position in which the inclined surfaces 18b, 21 of the clamping segments 18 and the housing 20 abut one another by an axial movement of the forming cylinder 5. The workpiece 2 is then inserted and pretensioned by an axial movement of the clamping cylinder 15, the segments 18 moving radially inwards and holding the workpiece. This state is in Fig. 10 shown. Only then can the actual forming process of the workpiece 2 begin, which - since it represents the main function of the device 1 according to the invention - was described above before the clamping process.

The invention is not limited to the exemplary embodiments shown, but the person skilled in the art can, if necessary, modify and / or supplement them by further expedient technical measures without departing from the scope of the invention. For example, the upsetting head 9 does not necessarily have to have an indentation 10 on its one end face for forming a contour of the workpiece 2 to be shaped. There may also be a different contour there. If, however, there is a depression 10, it can be, for example, how Fig. 4 and 5 and 8 to 10 emerges - it should be provided that the bottom surface 10a of the recess 10 is conical. As a result, an automatic adaptation to different pipe diameters and pipe wall thicknesses is advantageously achieved when the workpiece 2 is clamped and formed. For this purpose, a tip angle μ specially matched to the tube geometry can also be provided.

Reference numerals

1

Forming device

2nd

workpiece

3rd

Forming tool (tool unit)

4th

Cylinder unit

5

Forming pistons from 4, in 6

6

Forming piston chamber of 4, with 5

6a

first fluid entry point in FIG. 6

6b

second fluid entry point in FIG. 6

7

Tool holder from 4

7a

radial protrusion of 7 versus 5

8th

Fasteners for 7 on 5 (cylinder head screw)

9

Compression head of 4

9a

all-round edge web of 9

9b

Ring area from 9 to 10

10th

Deepening in 9 for 2

10a

Floor area of 10

11

Fasteners for 9 on 7

12th

Circumferential groove of 10

13

T-slot from 7

13a

Footbridge next to 13

15

Tensioning piston of 4, in 16

15a

Level at 15

16

Clamping piston chamber of 4, with 15

16a

Fluid entry in 16

17th

Clamping device for 2

18th

Segment of 17 (jaw)

18a

Floor area of 18

18b

Cone area from 18 to 21

18c

Inside of 18th

18d

Flange shoulder on 18 in 19b (second version

19th

Retaining ring for 9 (and 17, second version)

19a

inner rim from 19

19b

inner circumferential groove in 19 for 18d (second version)

20

casing

20a

first housing part of 20 for 4 with 6a, 6b, 16a (first version)

20b

second housing part of 20 for 3 (first version)

20c

third housing part of 20 for connecting 3 and 4 (first version)

21

conical inner surface of 20 to rest on 18b

22

Fastening element for connecting 20b and 19

23

External groove in 19 for engagement of 22

24th

Internal thread of 20c for screwing with 25

25th

Male thread of 4 for screwing to 24

26

Bund of 20b for investment on 27

27

Bundle of 20c for investment on 26th

28

Tool engagement point of 20c

30th

Window in 20 (second version)

F

Fluid

T1, T2

Separation points of 20 ( Fig. 5 )

X-X

Longitudinal axis of 1, 3, 4

µ

Tip angle of 10a

Claims (14)

1. Device (1) for deforming a workpiece (2), having a shaping assembly (5, 6, 7, 8, 9), which can be actuated by the pressure of a fluid (F), and having a clamping assembly (15, 16, 17, 19), which is arranged on a common longitudinal axis (X-X) and which can be actuated by the pressure of the fluid (F),
   characterized by an interchangeable tool unit (3) and by a cylinder unit (4), which is designed as a preassembled unit (4) which can be handled separately from the interchangeable tool unit (3), wherein the interchangeable tool unit (3) is a shaping tool (3) for the workpiece (2), which is arranged on the common longitudinal axis (X-X) of the shaping assembly (5, 6, 7, 8, 9) and of the clamping assembly (15, 16, 17, 19), and comprises a clamping device (17) having a plurality of clamping segments (18) for the workpiece (2), and a compressing head (9), which has, on one side, a depression (10) for forming a contour, which is to be shaped, of the workpiece (2), and, on the opposite side, a fastening means (11) for connection to a shaping piston (5) of the shaping assembly (5, 6, 7, 8, 9), wherein the compressing head (9) and the clamping device (17) are circumferentially structurally connected to one another in the shaping tool (3) forming the tool unit (3) so as to be axially movable relative to one another, and wherein the cylinder unit (4) is designed with a housing (20) or at least with a housing part (20a) and comprises the shaping piston (5), which is guided so as to be axially movable in a piston space.
2. Device (1) according to Claim 1,
   characterized in that the compressing head (9) is fastened in a holding ring (19) so as to be axially movable with stop-limitation on both sides.
3. Device (1) according to Claim 2,
   characterized in that the stop-limitation of the compressing head (9) for its axial movement in the holding ring (19) is formed, on the one side of the compressing head (9), by a radially inner peripheral edge web (19a) of the holding ring (19) on the one hand and by a complementary, outer peripheral edge web (9a) of the compressing head (9) on the other hand, and, on the other side of the compressing head (9), by a bottom surface (18a) of the clamping segments (18) on the one hand and by an annular surface (9b) of the compressing head (9) on the other hand, which annular surface surrounds a depression (10) for forming the workpiece contour.
4. Device (1) according to one of Claims 1 to 3,
   characterized in that the tool unit (3) comprises, in addition to the compressing head (9) and the clamping device (17), at least one housing part (20b) .
5. Device (1) according to Claim 4,
   characterized in that the compressing head (9) fastened in the holding ring (19) is inserted, together with the clamping device (17), into the housing part (20b), and in that the holding ring (19) is fastened in the housing part (20b) so as to be axially movable.
6. Device (1) according to Claim 4 or 5,
   characterized in that the holding ring (19) is held so as to be axially longitudinally displaceable in the housing part (20b) by means of a fastening element (22), in particular by means of a grub screw which engages by its tip in an outer groove (23) of the holding ring (19).
7. Device (1) according to Claim 2,
   characterized in that, in addition to the compressing head (9), the clamping device (17) is also fastened in the holding ring (19).
8. Device (1) according to Claim 7,
   characterized in that, in the region of its axial end facing away from the compressing head (9), the holding ring (19) has an inner circumferential groove (19b) in which in each case the clamping segments (18) of the clamping device (17) are fixed in a form-fitting manner in the axial direction by a flange attachment (18d) complementary with the circumferential groove (19b), but are held in a radially movable manner.
9. Device (1) according to one of Claims 1 to 8,
   characterized in that a bottom surface (10a) of the depression (10) of the compressing head (9) is conical in form.
10. Device (1) according to one of Claims 1 to 9,
    characterized in that the fastening means (11) is formed by a - as seen in longitudinal section - T-shaped contour of the compressing head (9) in the region of its end face for engaging in a shape-adapted T-groove (13) of a tool receptacle (7) situated on the shaping piston (5).
11. Device (1) according to one of Claims 1 to 10,
    characterized in that, for connection to the tool unit (3), the cylinder unit (4) has a/the tool receptacle (7), which is connected, in particular via a screw (8), to a/the shaping piston (5) of the shaping assembly (5, 6, 7, 8, 9), and in that, on an end side facing the cylinder unit (4), in particular on its compressing head (9), the tool unit (3) has a/the fastening means (11) for connection to the tool receptacle (7).
12. Device (1) according to one of Claims 1 to 11,
    characterized in that, for mounting or for interchanging on the cylinder unit (4), the tool unit (3) can be screwed to the cylinder unit (4), in particular by means of a/the housing part (20c), or can be unscrewed from the cylinder unit (4).
13. Device (1) according to one of Claims 1 to 12,
    characterized in that the housing (20) comprises, in the cylinder unit (4), a/the first housing part (20a) and, in the tool unit (3), a/the second housing part (20b) and a/the third housing part (20c), which can be releasably connected to one another.
14. Device (1) according to one of Claims 1 to 13,
    characterized in that, for mounting or for interchanging on the cylinder unit (4), the tool unit (3) can be inserted into the cylinder unit (4) or can be removed therefrom through a window (30) in a housing (20) for the shaping assembly (5, 6, 7, 8, 9) and the clamping assembly (15, 16, 17, 19).

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