WO2022111753A1

WO2022111753A1 - Radial pressing tool

Info

Publication number: WO2022111753A1
Application number: PCT/DE2021/100886
Authority: WO
Inventors: Sabrina RÜTH; Dennis Hesse; Maximilian Gottschalk
Original assignee: Rothenberger Ag
Priority date: 2020-11-24
Filing date: 2021-11-08
Publication date: 2022-06-02
Also published as: DE112021006112A5; EP4251372A1

Abstract

According to the invention, to simplify handling of a multi-membered, movably constructed radial pressing tool, which, when closed, groups multiple matrix elements in a ring to form a drilling matrix and, when open, forms a variable passage gap for a workpiece between two matrix elements, the radial pressing tool, when open, has a number of surface features in the region of the passage gap, and said surface features allow, when the radial pressing tool is pushed onto a workpiece having a collar or bead, creation of a form fit with the collar or bead when the radial pressing tool is in the intended axial working position relative to the workpiece. The radial pressing tool can also comprise a latching device, which is designed to define a latching position which can be overcome in a number of open positions, of which one can be a partially open position in which passage of the workpiece through the passage gap is not possible.

Description

radial press tool

technical field

The present disclosure relates to a radial compression tool for making tube connections and in particular to a compression ring and compression tongs for this purpose and methods of using the same.

Conventional radial pressing tools, in particular the radial pressing tools referred to as pressing tongs, pressing rings and pressing slings are designed to convert a workpiece and in particular an assembly of a pipe end piece and a connection piece, e.g. a fitting, from an original oversize shape into to reshape a given final shape. The change in shape associated with the deformation can include a radial and/or axial deformation of the assembly or individual parts thereof. Alternately or cumulatively, the change in shape may also include a relocation of parts of the assembly relative to each other. Further details in this regard are disclosed in publications DE 10144 100 CI, DE 102008010083 A1, to which reference is made here for the purpose of supplementing the disclosure with the note that the publications cited may give identical terms a meaning that differs from the present one.

Radial pressing tools often act on more than 180° of the circumference of the workpiece and must therefore be set up to be able to form the passage gap required for attaching and removing the radial pressing tool on or from the workpiece. In some cases, this is achieved structurally by a multi-part, coherent design of the radial pressing tool. The mobility of the individual members relative to one another is dimensioned in such a way that the passage gap required for the stated purposes is present in at least one setting. In some embodiments, the radial press tools are two-part press rings with only one joint and two links connected therein. The die required for forming can be formed by several die elements that are arranged on the members. In one setting of the links, the die elements can form a more or less continuously defined die bore. In one or more other settings of the links, there is a sufficient gap for the workpiece to pass through at least between two die elements. In simple designs, only two matrix elements are provided, which in special designs are integrally formed directly in the links. These two-part press rings can be positioned on the workpiece in an open setting. In other versions, the radial pressing tools are three-part pressing pliers, in which two levers equipped with matrix elements are connected to one another via a strap. In yet other versions, the pressing tools are press chains or press slings with three or more links.

Dealing with the degrees of freedom of movement of a multi-part radial pressing tool when attaching and removing it on or from the workpiece can present difficulties for the user in some situations. In some versions, this was counteracted by a spring-loaded prestressing of the links, which can be changed by the user. Further details in this regard are disclosed in publications EP 2995426 A1 and DE 102013 112848 A1, to which reference is made here for the purpose of completeness and supplementation, with the note that the publications cited may give identical terms a meaning that deviates from the present one. Furthermore, approaches are known to support a user when aligning radial press tools on the workpiece to be machined by improving the lighting of the job. In this regard, reference is made in particular to publication DE 297 14629 U1. Against the background of the advances explained, a continuing need can be seen in further supporting the user in the correct application of a radial pressing tool to the workpiece. This is based on the expectation that more extensive support can avoid faulty work results in certain situations. In some situations, for example, further support can prevent the operator from handling errors when applying a radial pressing tool to the workpiece. As is well known, some of these handling errors can impair the quality of the forming performed with the radial pressing tool.

concepts

Fundamental improvements in handling are provided by a multi-part, movably constructed radial pressing tool that is set up to group several die elements in a ring shape into a bore die in a closed setting and to form a variable passage gap for a workpiece in open settings between two die elements, with the radial pressing tool in an open setting in the area of the passage gap has a number of surface features with which, when the radial pressing tool is pushed onto a workpiece with a collar or a bulge, a form fit with the collar or the bulge can be produced if the radial pressing tool is positioned relative to the workpiece in the intended axial direction working position is.

The form fit can be on one side or on both sides. In both cases, a user can tactilely find the axial working position via the form fit, from which the radial pressing tool can be moved by a displacement running essentially radially to the die bore into the working position in which the workpiece is formed by closing the radial pressing tool against its structural resistance .

The improved radial swage tool may further be configured such that the die bore formed by the die elements in the closed setting is axially profiled and specifically includes a circular groove for receiving a ridge on the workpiece.

The improved radial swage tool may further be configured such that the surface features are arranged such that when it is mated with the bead of the workpiece, the groove is radially aligned with the bead.

The improved radial swaging tool can further be configured such that the surface features are present on both sides of the passage gap.

The improved radial pressing tool can also be designed in such a way that the surface features are arranged in the intermediate space and/or on the end face of the passage gap.

The improved radial pressing tool can also be designed in such a way that the surface features comprise a number of grooves or slots, which in particular taper off in the radial direction towards the die bore and in particular have a depth which decreases towards the die bore.

The improved radial pressing tool can also be designed in such a way that the grooves or slits continue into one end face at the passage gap.

In principle, useful results are achieved by using a previously defined radial pressing tool to find the axial working position before the forming process via the tactile form fit in the contact between a collar or bead on the workpiece and the surface features in the area of the passage gap. Further progress has been achieved in principle or additionally by a design of a multi-part, moveable radial pressing tool that is suitable for grouping several die elements in a ring shape into a bore die in a closed setting and for forming a passage gap between two die elements in open settings, with the radial pressing tool comprising a latching device that is used for this purpose is set up to define an overcomeable detent position in a number of open settings.

The further improved radial pressing tool can also be designed in such a way that several links are movably connected in pairs with one another by joints and the parts of the locking device intended for overcoming this mobility are assigned to the respective joint and in particular are integrated into the respective joint.

The further improved radial pressing tool can also be designed such that a latching position predetermined by the latching device is in a partially open setting in which the width of the passage gap is not sufficient for pushing through a workpiece suitable for machining with the axially profiled die bore.

The further improved radial pressing tool can also be designed such that the partially open setting is determined such that the latching device can be overcome by expanding the passage gap by radially pushing the passage gap in the first open setting against the workpiece.

The further improved radial pressing tool can also be designed in such a way that a latching position predetermined by the latching device is in a fully open setting in which the width of the passage gap is sufficient for pushing through a workpiece suitable for machining with the bore die while maintaining the latching position.

The further improved radial pressing tool can also be provided with a prestressing device and in particular a closing spring, the prestressing of which is directed towards the contraction of the passage gap in at least one open position.

The further improved radial pressing tool can be a particularly two-part press ring, a particularly three-part press sling or a particularly three-part press pliers.

The further improved radial pressing tool can have a hanging or attachment point for a safety cable, particularly in the form of a two-part pressing ring. In configurations, this hanging or attachment point can be arranged in particular in the area of a joint point between the movable members. In other configurations, the hanging or attachment point can be an eyelet or a flake.

Still further advances result from adapter tongs for driving a press ring or a press sling by means of an electrohydraulic press machine, the adapter tongs further comprising devices for attaching the press ring or press sling via a safety cable or an equivalent endzugrigist connection. In configurations, the connection which is rigid at the end of tension can comprise a safety cable. In further configurations, the arresting rope can be attached in a retractor, from which a limited length of the arresting rope can be pulled out against a preset spring force.

Still further advances result in principle in a method for forming a workpiece with a bead by means of a radial pressing tool specified above and a drive device for its actuation, the method comprising steps for providing the radial pressing tool in a first setting in which the width of the passage gap is not sufficient for pushing through the workpiece intended for processing; to attach the Pass-through gap on the bead of the workpiece and alignment of the radial pressing tool on the bead by means of the surface features present on the pass-through gap on the intended machining position; for sliding the radial pressing tool over the bead of the workpiece while widening the passage gap against a closing force; and for bringing the radial pressing tool into the closed setting while deforming the workpiece picked up by the die elements by means of the drive device.

Brief description of the figures

Two exemplary embodiments of the concepts outlined above are explained in the following section with reference to the attached drawings. Show in it:

1 shows a side view of a first exemplary embodiment of a radial press tool in the configuration of a two-part press ring in the closed setting;

FIG. 2 shows a view of the two-part press ring in a first setting according to FIG. 1 from the front side;

3, 4 two sectional views through the two-part press ring according to FIG. 1 in the sectional plane shown there;

5 shows a sectional view of the detail “X” from the two-part press ring according to FIG. 1 in the plane of the sectional plane according to FIG. 3;

6 shows a sectional view of the detail “X” from the two-part press ring according to FIG. 1a in the sectional plane according to FIG. 4;

7 is a side view of the two-piece ferrule of FIGS. 1-6 in a first position in abutting contact with an assembly of a straight fitting and a tube end fitting;

8 is a side view of the two-piece ferrule of FIGS. 1-3 in a second position in abutting contact with a straight fitting and tube end assembly; and

9 is a side view of the two-piece ferrule of FIGS. 1-3 in a third position in gripping contact with a straight fitting and tube end assembly;

FIG. 10 shows a plan view of the arrangement according to FIG. 9;

FIG. 11 shows a side view of an interacting arrangement made up of an exemplary pressing tool according to FIG. 1 and a drive device for actuating it;

FIG. 12 shows a side view of a tool safety device in the arrangement according to FIG. 11;

13 shows a side view of a second exemplary embodiment of a radial pressing tool in the configuration of a three-part pressing tongs in the closed setting;

FIG. 14 shows a sectional view of detail "Y" from the three-part crimping pliers according to FIG. 13 in the closed setting shown there; and

Figure 15 is a sectional view of detail "Y" from the three-part crimping pliers of Figure 13 in a partially open position. exemplary embodiments

1 to 6 show the structure of a first exemplary embodiment of a radial press tool 1, which is generically referred to as a press ring 1 in technical circles and here.

The exemplary press ring 1 comprises two curved legs 2, 3, each of which is connected to one another at one end by a joint so that it can pivot about an axis A. The joint of the exemplary press ring 1 is formed by a bolt 4 which is inserted into aligned bores of end brackets 5, 6 interlaced like a comb on the legs 2, 3.

The exemplary press ring 1 has two connection points 7, 8 for a drive device on the free ends of the legs 2, 3 protruding from the joint. About these connection points 7, 8, the energy required for forming a workpiece can be introduced into the exemplary press ring 1 who the. In particular, the connection points 7, 8 are set up for a pincer-like attack on a special drive device and specifically designed as conical caps. A drive device compatible with these connection points 7, 8 could, for example, include spherical pressure bolts in order to compensate for the changes in the angle of attack at the connection points 7, 8 that occur when the legs 2, 3 are pivoted.

The exemplary press ring 1 has two parts in the sense that the force-conducting structure running between the two connection points 7, 8 comprises only the legs 2, 3 and the joint.

On each leg 2, 3 of the exemplary press ring 1, a flat matrix is integrally formed as a matrix element 9 or 10, respectively. The matrix elements 9, 10 are designed in such a way that, in the closed setting of the legs 2, 3, in particular according to FIG. 1, they come together to form a profiled bore matrix. The bore matrix of the exemplary press ring 1 is defined in the closed setting except for rounded edges over the entire planar circumferential angle and reveals three different profile sections in the axial direction, in particular with a view to FIGS. 3 and 4, which are explained below.

A first profile section, which is, for example, in the middle of the die bore, defines a rounded groove 11 that is essentially circular. This groove 11 is followed on both sides by second, exemplarily similar profile sections, which generally define essentially short, cylindrical bore sections 12, 13. Between these bore sections 12, 13 and the outlet openings from the die bore from the press ring 1, third profile sections are provided on both sides, which define a total of two hexagons 14, 15 of the same size and orientation in the exemplary embodiment.

According to FIG extend across the entire axial extent. For the sake of clarity, the inner closing surface 16 lying closer to the joint and the outer closing surface 17 lying further away from the joint are only shown in FIG. 4 for the lower leg 3 . The end point of the deformation is defined in a manner known per se by the contact of the outer closing surfaces. In addition, the narrow gap on both sides of the die bore, which is delimited in pairs by the closing surfaces, prevents material from flowing out shortly before the end point of the forming process.

According to FIGS. 1 to 4, the exemplary press ring 1 has a number of surface features 18, 19 adjacent to the outer closing surfaces 17, which are embodied as wedge-shaped recesses 18, 19, which are pronounced towards the end face. Between the beginning of the recesses 18, 19 and the die bore, a sufficiently wide one can be used according to the exemplary embodiment Section of the outer closing surfaces 17 remain. Due to the wedge-shaped depth of the recesses 18, 19, which increases towards the end face, these can form a positioning aid in a partially open setting of the exemplary press ring, which will be discussed in more detail in the context of the explanations for FIGS.

According to FIG. 6, a closing spring 21 is inserted in the exemplary press ring 1 in an enlarged intermediate space 20 between the comb-like end plates 4, 5, which is supported on each of the legs 2, 3 in a recess 22 or 23 suitably arranged there. The closing spring 21 is set up in the exemplary press ring 1 to spring-bias the two legs 2, 3 towards the closed setting according to FIG.

According to FIG. 5, a blind hole 24 is also introduced in the upper leg 2 of the exemplary press ring 1, which receives a ball 25, which is biased by a compression spring 26 behind it to open the blind hole 24 out. The ball 25 is supported against a surface on the lower leg 3 of parent and to the axis of the bolt 4 is substantially concentric arcuate surface 27 from. Deviating from the arcuate shape, the running surface 27 has two angularly offset depressions 28, 29 are arranged. In a relative pivoting movement of the angle's 2, 3 slides or rolls the ball 25 on the running surface 27 from. In the area of the arched shape of the running surface 27, this generates a small moment of friction which opposes the movement. On the other hand, at the locations of the recesses 28, 29, there is a pronounced cogging moment, which is directed toward the lowest position of the ball 25 in the relevant recess 28, 29, regardless of the direction of movement.

In an expedient embodiment, the force exerted by the closing spring 21 on the legs 2, 3 is dimensioned in all settings of the legs 2, 3 so that the torque generated thereby overcomes the previously mentioned frictional moment of the ball 25, but behind its detent ment in the recesses 28, 29 remains. In this configuration, the exemplary swage ring 1 will maintain each of the two detent positions in which the ball 16 resides in one of the two indentations 28,29. On the other hand, the press ring 1 will not be retained in other, non-closed settings outside of the detent positions. In particular, configurations of the closing spring 21, the compression spring 26 and the depressions 28, 29 are possible with which the exemplary press ring 1 automatically returns to the closed setting from any setting that does not correspond to a latching position. Such a design can enable a user to first bring the exemplary press ring 1 into one of the two exemplary locking positions in order to subsequently overcome them with a slight influence. In addition, such a design ensures that the exemplary die 1 will remain in or return to the closed position during storage and shipping. This can sometimes be helpful in order to avoid damaging the surfaces of the matrix elements 9, 10.

The exemplary press ring 1 can be used in a manner known per se to produce a positive connection between an assembly of a fitting 31 and a pipe end piece 32 . The exemplary press ring 1 and comparably constructed radial press tools are often attached to the workpiece separately from the drive device required to generate the actuating force. Only then is the drive device connected. This can be helpful for the user when the work situation would restrict maneuvering with the drive device for the purpose of aligning the radial pressing tool on the workpiece. In particular, the user's attention can now be fully concentrated on correctly applying the exemplary press ring 1 to the workpiece. In a typical workflow according to FIGS. 7 to 10, the user will use the pivotable connection between the two legs 2, 3 of the exemplary press ring 1 to come from a radial direction around the workpiece 30 to be machined and in particular around the assembly shown of a fitting 31 and a pipe end piece 32, to be arranged gripping around. This procedure will be considered in particular if it is not possible to slide the press ring 1 in an axial direction.

According to FIG. 7 in particular, the exemplary press ring 1 can assume the first latching position 28 according to FIG. 5 in a first partially open setting at the beginning of the application to the workpiece 30 . The user can, for example, adjust the exemplary press ring 1 to the first latching position 28 before moving it to the workpiece 30 . With a suitable design, the exemplary press ring 1 will retain this setting as long as no significant external forces act towards a relative pivoting of the legs 2, 3. In this partially open first setting, the user can bring the exemplary compression ring 1 with its front side up to the workpiece 30 until it makes contact, which is illustrated schematically in FIG. 7 . If the user has aligned the exemplary pressing tool 1 axially correctly with the workpiece 30, the bead 33 on the fitting 31 will be aligned with the recesses 18, 19. From an alignment that is slightly axially offset from this correct position, the user will be able to easily find the correct alignment by slightly laterally displacing the example press ring 1 on the bead 33 of the fitting 31 . As soon as the exemplary press ring 1 reaches the correct position, the bead 33 of the fitting 31 will noticeably dip into the prismatic depression formed by the recesses 18, 19. This process can provide a vigilant user with useful tactile feedback as to the proper alignment between the exemplary die 1 and the workpiece 30 .

As soon as the user has found the correct alignment of the exemplary press ring 1 on the workpiece, he can press the exemplary press ring 1 more firmly against the workpiece 30 in order to overcome the latching position according to FIG. 8 and open the legs 2, 3 further. The prestressing force of the closing spring 21 can contribute to the outer ends of the legs 2, 3 maintaining contact with the workpiece 30 continuously. The recesses 18, 19, which continue inwards close to the die bore, allow the user to maintain the lateral form fit of the exemplary pressing tool 1 with the bead 33 of the fitting 31 until it overflows the short section of the outer closing surfaces 17 and into the groove 11 runs into the die bore. The user can support this by slightly squeezing the legs 2, 3 together and thereby attaching the exemplary press ring 1 in the correct position on the workpiece 30. Then, according to the schematic illustration in FIGS. 9 and 10, the bead 33 of the fitting 31 will lie in the groove 11 of the die bore.

The exemplary press ring 1 can in particular be set up to provide a sufficiently large closing force through the closing spring 21, which holds the leg 3 shown below in FIGS. 7 to 10 securely in abutment against the workpiece against the weight acting on it in a real situation. In the case of small and light pressing rings in particular, it may be necessary to provide a closing force that clearly exceeds what is necessary to compensate for the weight forces. As a result, the user can be supported when attaching a drive device. In particular, a sufficiently large dimensioned closing force can counteract the unintentional stripping of the exemplary press ring 1 from the workpiece 30 when the drive device is applied.

According to FIG. 11, the exemplary press ring 1 correctly arranged on the fitting 31 can be coupled to a suitable drive device in order to produce a press connection. the The drive device is symbolized in FIG. 11 as an assembly of an exemplary electrohydraulic press machine 35 and an adapter tong 34 . The intermediate tongs 34 have two legs 36a, 36b which are pivotably suspended in a common plane and which engage in the connecting points 7 of the exemplary pressing ring 1 with front pressure pins 37 facing away from the pressing machine 35 for force transmission. This is illustrated for the upper leg 36a in the broken sectional view. The pressure pins 37 can in particular be designed to be hemispherical in order to enable the angle between the plane of the exemplary pressing tool 1 and the plane of the legs 35, 36 of the adapter tongs 34 to be freely selected within limits. Further details and possible configurations are disclosed in the publications EP 1 201371 B1, EP 1 972 394 B1 and EP 2 230049 B1, to which reference is also made here for the purpose of completeness and supplementation of the disclosure, with the note that terms that are the same there may have a different meaning interpretation is attached.

According to FIG. 12, it can be useful in certain applications to attach the press ring selected for the work to the adapter tongs or the press machine with a connection that is rigid at the end of tension, in order to prevent the press ring from falling off due to careless handling. This measure can be prescribed in particular as fall protection when working on roofs and scaffolding, in order to protect people below the work site from injury from falling objects. In a simple design, fall protection can be limited to equipping the press ring and adapter tongs with eyelets to which the ends of a short arresting rope are attached. The stop can be released on one side or on both sides. In particular, the detachable stop can be realized by snap hooks, spring hooks or folding eyelets, in particular in order to correspond to a possible mechanical compatibility of the adapter tongs with several different compression rings. In the exemplary situation, a further developed exemplary press ring 1' is equipped with a semicircular eyelet 4a on the head of the bolt 4, which allows a safety cable 38 to be attached.

In the exemplary situation, the safety cable is a thin steel or synthetic fiber cable, which carries a spring hook 38a at a free end. The other end of the safety rope 38 is in a device 39 Aufrollvorrich attached. The retractor 39 may be attached to the adapter tongs 34 as shown by way of example and may comprise a round housing in which a spool and a spring mechanism are housed in order to pull the safety cable 38 into the interior of the housing through an opening 39a with a small force.

The exemplary winding device 39 can ensure that only the required length of the safety rope 38 is made available in all work situations. This can help avoid inadvertently knotting or tangling the free portion of the tether 38 . In the exemplary connection of the arresting cable 38 to the adapter tongs 34, there is the advantage of a shortened arresting cable length in typical working methods compared to the usual attachment to the person, in particular to the wrist, or to the personal safety harness. Alternatively, the safety rope of the press ring can also be attached to the press machine, which in the scenarios in question always requires a connection by means of a safety rope.

13 to 15 show the structure of a second exemplary embodiment 40 of a radial pressing tool, which is generically referred to in technical circles and here as pressing pliers. Furthermore, FIGS. 14 and 15 symbolize a special possibility for handling the exemplary pressing tongs 40.

The force-conducting structure of the exemplary pressing tongs 40 comprises two two-armed levers 41, 42 which are connected to one another by a double-layered strap element 43. Since the tab member 43 NEN section of the force-conducting structure of the exemplary pressing tongs 40 forms, these can be viewed as a three-part radial pressing tool. However, in the exemplary pressing tongs 40 only the two levers 41, 42 and thus only two members of the force-conducting structure are equipped with matrix elements 45, 45. As in the case of the exemplary press ring 1 explained above, the die elements 44, 45 in the exemplary pressing tongs 40 are also designed integrally with the force-conducting structure. The two-armed levers 41, 42 are for pivoting the Matrizenele elements 44, 45 from the closed setting shown by two bolts 46, 47 articulated to the double-layered tab member 43 attached.

These articulated connections are inherently moveable independently of each other by their design. However, under certain circumstances it can be perceived as advantageous by a user if the exemplary pressing tongs 40 are further developed by provisions for inverse synchronization of the pivoting movements in the articulated connections. In this respect, for the purpose of completing and supplementing the present disclosure, reference is made to the official publications DE 10 2018 118 677 A1, DE 203 18345 U1 and EP 2 995426 A1 with the note that the cited publications may give identical terms a meaning that is differs from the present one.

The outer ends of the exemplary pressing tongs 40 protruding to the right have two recesses 48, 49 arranged approximately in the middle of the axial extent of the die bore, which are set up to form a positive fit with a bead in the closed setting and in some partially open settings of the exemplary pressing tongs 40 33 of a work piece 30 to be machined. Again, the workpiece 30 to be machined can be an assembly of a pipe end piece 32 and a fitting 31 .

In particular, according to FIGS. 14 and 15, the recesses 48, 49 can be formed as grooves or grooves. In particular, the recesses can be arcuate or prismatic in order to enable positive locking in two directions. According to FIG. 12, a user can bring the exemplary pressing tongs 40 in the closed setting from an approximately radial direction until they come into contact with the bead 33 of the fitting 31 and look for the tactile form fit between the bead 33 and the recesses there. As soon as the position of the exemplary pressing tongs 40 in relation to the fitting 31 corresponds to the situation in FIG. 12, the operator can slowly open the exemplary pressing tongs 40 while maintaining contact and slide the front ends over the fitting. The positive connection between the bead 33 and the recesses will help the operator not to lose the previously found axial alignment of the exemplary pressing tongs 40 in relation to the fitting 31 .

Instead of the recesses recommended here as examples, other surface features in the area of the passage gap for the workpiece can produce an equally useful effect both in the case of a pressing ring and in the case of pressing tongs or a similarly constructed radial pressing tool. In particular, in some applications, surface features applied on one side may also be sufficient to provide a sufficient tactile representation of the alignment of the radial pressing tool on the workpiece to be formed. Accordingly, projections, webs and beads can also be considered as surface features if this is otherwise compatible with the function of the radial pressing tool. In particular, protruding surface features can be provided on surfaces that maintain a sufficient spacing in all settings of the radial press tool. Such a situation exists, for example, when the outer ends of the legs of a compression ring are set back from the parting plane, as is the case in some typical designs.

Claims

Expectations

1. Radial pressing tool (1; 40) with a multi-part, movable structure, which is set up to group a plurality of die elements (9, 10; 44, 45) in a ring shape into a drilling die in a closed setting and between two die elements (9, 10 ; 44, 45) to form a variable passage gap (S) for a workpiece, the radial pressing tool (1; 40) having a number of surface features (18, 19; 48, 49) in an open setting in the area of the passage gap (S). , with which, when the radial press tool (1; 40) is pushed onto a workpiece (30) with a collar or a bead (33), a form fit with the collar or the bead (33) can be produced if the radial press tool (1; 40 ) is relative to the workpiece (30) in the intended axial working position.

2. Radial pressing tool (1; 40) according to claim 1, wherein the bore die formed by the die elements (9, 10; 44, 45) in the closed setting is axially profiled and in particular has a circular groove (11) for receiving a bead ( 33) on the workpiece (30).

3. Radial pressing tool (1; 40) according to claim 2, wherein the surface features (18, 19; 48, 49) are arranged such that when they form fit with the bead (33) of the workpiece (30), the groove (11) is radially aligned aligned with the bead (33).

4. Radial pressing tool (1; 40) according to any one of the preceding claims, wherein the surface features (18, 19) are present on both sides of the passage gap (S).

5. Radial pressing tool (1; 40) according to any one of the preceding claims, wherein the surface features (18, 19; 48, 49) in the intermediate space and / or on the end face of the passage gap (S) are arranged.

6. Radial pressing tool (1; 40) according to claim 5, wherein the surface features (18, 19) comprise a number of grooves or slots (18, 19; 48, 49) which are applied in particular tapering in the radial direction onto the die bore and entirely in particular have a depth that decreases toward the die bore.

7. Radial pressing tool (1; 40) according to claim 6, wherein the grooves or slots (18, 19; 48, 49) are continued up to an end face at the passage gap (S).

8. Multi-part movably constructed radial pressing tool (1), in particular according to one of the preceding claims, which is set up to group several matrix elements (9, 10) in a closed setting to form a bore matrix and in open settings between two matrix elements ( 9, 10) to form a passage gap (S), the radial pressing tool (1) comprising a latching device (24, 25, 26, 27, 28) which is set up to lock in a number of open settings of the radial pressing tool (1; 40 ) to define a surmountable detent position.

9. Radial pressing tool (1) according to claim 8, wherein several links (2, 3) are movably connected in pairs to one another by joints and the parts of the locking device (24, 25, 26, 27, 28) intended to fix this mobility in a way that can be overcome assigned to each joint and are in particular integrated into the respective joint.

10. Radial pressing tool (1) according to claim 8 or 9, wherein a predetermined locking position by the locking device (24, 25, 26, 27, 28) is in a partially open setting in which the width of the passage gap (S) for pushing through a for machining with the axially profiled die bore suitable workpiece (30) is not sufficient.

11. Radial pressing tool (1) according to claim 10, wherein the partially open setting is determined such that by radially pushing the passage gap (S) in the first open setting against the workpiece (30), the latching device (24, 25, 26 , 27, 28) by expanding the passage gap (S) can be overcome.

12. Radial pressing tool (1) according to one of claims 9 or 10, wherein a by the Rasteinrich device (24, 25, 26, 27, 28) predetermined latching position is in a fully open setting in which the width of the passage gap (S) for pushing through a workpiece (30) suitable for machining with the bore die while maintaining the latching position is sufficient.

13. Radial pressing tool (1) according to any one of the preceding claims with a Vorspanneinrich device (21), the bias in at least one open arrangement on the contraction of the passage gap (S) is directed.

14. Radial pressing tool (1; 40) according to any one of the preceding claims, which is in particular a two-part press ring (1) or an in particular three-part press sling.

15. Radial pressing tool (1) according to claim 14, further comprising a suspension or attachment point (4a) for a safety cable (39), the suspension or attachment point (4a) being arranged in particular in the region of a joint point between the movable members.

16. Adapter tongs (34) for driving a radial pressing tool (10) by means of an electro-hydraulic pressing machine (35), the adapter tongs (34) also comprising devices (39) for attaching a pressing ring (12) via a safety cable (38) or an equivalent connection that is rigid at the end of tension .

17. Radial pressing tool (1; 40) according to one of the preceding claims, which is in particular a three-part pressing pliers (40).

18. A method for forming a workpiece (30) with a bead (33) by means of a radial pressing tool (1; 40) according to any one of claims 1 to 17 and a drive device (34, 35) for its actuation, the method comprising steps for :

Providing the radial pressing tool (1; 40) in a first setting in which the width of the passage gap (S) is not sufficient for pushing through the workpiece (30) provided for machining;

Attaching the passage gap (S) to the bead (33) of the workpiece (30) and aligning the radial pressing tool (1; 40) on the bead (33) by means of the surface features (18, 19; 48, 49) present on the passage gap (S). ) to the intended machining position; Sliding the radial pressing tool (1; 40) over the bead (33) of the workpiece (30) while widening the passage gap (S) against a closing force;

Bringing the radial pressing tool (1; 40) into the closed setting while deforming the workpiece (30) held by the die elements (9, 10; 44, 45) by means of the drive device.