EP2832868B1 - Press tool and method for producing a press tool - Google Patents

Description

The invention relates to a method for producing a pressing tool. The invention also relates to a pressing tool which can be produced by such a method.

Such pressing tools are usually used to connect pipe sections by pressing the pipe sections against one another by means of the pressing tool. For this purpose, the pressing tools have at least two pressing jaws which can be moved relative to one another and between which the pipe sections to be connected can be brought. By moving the pressing jaws towards one another, a deformation force is exerted on the pipe sections to be connected and the pipe sections are pressed against one another as a result.

For reasons of wear protection, the pressing jaws are usually surface-hardened in various areas. Nitrocarburizing, for example, has previously been used as a hardening process. Due to the only small depth of hardening that can be achieved using this process, losses in service life have previously had to be accepted.

Press tools with surface-hardened areas are from the US 2003/046973 A1 , the EP 1 447 179 A2 and the DE 10 2006 050 799 A1 known.

The invention is based on the object of proposing possibilities by means of which premature signs of wear on the pressing tool, in particular its pressing jaws, are counteracted and the service life is thus extended.

This object is achieved with a method for producing a pressing tool with the features of claim 1 and with a method for producing a pressing tool with the features of claim 3. Furthermore, a pressing tool with the features of claim 11 and a pressing tool with the features of claim 12 are proposed to achieve the object. Advantageous embodiments of the invention emerge from the subclaims, the following description and the figures.

1. i) Formung eines zumindest teilweise härtbaren Rohlings auf das oder ein Fertigmaß einer Pressbacke
2. ii) Beaufschlagen wenigstens eines ausgewählten Bereiches der Oberfläche der Pressbacke mittels eines Laserstrahles zur Ausbildung wenigstens einer oberflächennahen Härteschicht.

A method according to the invention for producing a pressing tool has the following steps, which follow one another in the order given:

1. i) Forming an at least partially hardenable blank to the size or a finished size of a press jaw
2. ii) Applying a laser beam to at least one selected area of the surface of the press jaw to form at least one hard layer close to the surface.

By producing a press tool in this way, hard layers close to the surface can be produced on the press jaws, the hardness and hardening depth of which is so great that a long service life is achieved. By using a beam, namely the laser beam, In addition, local surface areas of the pressing tool specifically harden without the entire pressing tool or the respective pressing jaw having to be heated for this purpose. As a result, a sharp demarcation between hardened areas and non-hardened areas on the pressing tool or the respective pressing jaw can be achieved, so that only the areas intended for hardening are actually hardened with high dimensional accuracy. This high dimensional accuracy of the hardening is achieved because only a small area of a surface layer is heated by the action of the laser beam and the necessary very rapid cooling takes place through the dissipation of heat into the pressing tool or the pressing jaw. It is therefore neither necessary to heat the press tool or the press jaw nor to cool it with a quenching medium in order to form the hardness layer. The formation of the hard layer is therefore relatively easy to implement in terms of process technology and is therefore relatively inexpensive.

The blank used to produce the press jaw can be forged or made of cast, in particular investment casting.

According to one embodiment of the invention, it is provided that the pressing jaw has or consists of a metallic alloy, in particular has or consists of steel, in particular has or consists of highly tempered steel. This means that materials with a crystalline structure are used. Such materials can be hardened or at least promote hardening close to the surface. By using a tempered steel, in particular highly tempered steel, the at least one selected area can be used form the hardness layer close to the surface, whereas the rest of the press jaw still retains its ductile structure. In this way, it is avoided that in the event of an overload there is a brittle fracture and the associated bursting of the press jaw. Due to the ductile structure of the press jaw in the non-hardened areas, sufficient deformation of the material is ensured in the event of overload, so that a ductile fracture occurs at best.

According to a further embodiment, it is provided that the hard layer has a thickness of approximately 0.2 mm to approximately 1.5 mm, in particular 0.5 mm to 1.2 mm. This ensures a sufficient thickness of the hardening layer in order to achieve sufficient wear resistance and thus to achieve a long service life.

In particular, the thickness of the hardness layer also forms the hardening depth over which the hardness layer extends from the surface of the press jaw.

In order to achieve a constant hardness over the selected area, the thickness of the hardness layer should be essentially constant, in particular should be constant throughout.

Alternatively, it can be provided that the thickness of the hard layer is varied or can be varied between approximately 0.2 mm to approximately 1.5 mm, in particular 0.5 mm to 1.2 mm.

According to the invention it is provided that the press jaw has a die and at least one end face, which for

It is used to form a closing joint, the at least one selected area being in the transition from the die to the end face. As a result, the at least one area is affected by the hardening treatment, which area is subject to a particularly high load when the pipe sections are pressed. The transition of the die to the end face affected here scrubs along the outer circumference of the pipe section to be pressed in the course of the closing movement of the pressing jaws and is therefore subject to high mechanical stress. The formation of the hard layer in the transition prevents premature wear at the transition.

According to the invention it is further provided that the at least one selected area lies adjacent to at least one edge or at a distance from at least one adjacent edge in the transition of the die to the end face. As a result, the edge itself remains unhardened or at least largely unhardened, so that the edge still has a certain ability to absorb pressure. For example, the edge can also have a ductile structure, whereas the hardness layer is then formed in the subsequent transition. The edge can be a marginal edge, for example a longitudinal edge.

The edge is to be understood as the area of a linear extension in which two surfaces or sides of the pressing jaw that are at an angle to one another adjoin or lie on one another. The edge is thus formed by the area of the line of intersection of two surfaces or sides of the pressing jaws that are at an angle to one another. In particular, the edge forms one common edge of the two mutually angled surfaces or sides of the press jaw. In order to protect against injuries, the edge is preferably designed to be rounded or beveled.

According to a further embodiment, it is provided that in the transition from the die to the end face only the section or sections with the smallest distance from the central axis of the die is or are laser-irradiated. This saves processing time, since the entire transition from the die to the end face is not laser-irradiated. Since only the section or sections with the smallest distance to the central axis of the die are laser-irradiated, the hardness layer formed in the transition is interrupted at least once or several times. This also effectively counteracts possible crack formation, for example coming over the hardened section or sections.

Since only the section or sections with the smallest distance from the central axis of the die is or are laser-irradiated, the areas in the transition of the die to the end face are nevertheless covered by the hardness layer, which are particularly mechanically stressed during pressing.

The central axis is to be understood as the axis coinciding with the longitudinal axis of the pipe sections to be pressed or the axis which is spaced apart in parallel and which lies in the center of the die formed by the pressing jaws.

According to the invention, it is provided that the press jaw has at least one contact side with at least one contact surface against which a running or sliding element, such as a drive roller, can be brought into operative contact, the at least one selected area lying on the contact surface. This affects the at least one area for the hardening treatment, which is subject to a particularly high load when the pipe sections are pressed. An actuating device acts on this area, namely the contact side or contact surface, in order to press the pressing jaw against the pipe sections to be pressed while exerting a pressing force. For this purpose, the contact side or the contact surface is acted upon, for example, by a drive roller of the actuating device. The contact side or the contact surface is therefore subject to high mechanical stress. The formation of the hardening layer prevents premature wear.

The selected area can extend on the contact surface into or over an inlet curve for the running or sliding element. As a result, the run-in rounding is also encompassed by the hardness layer brought about by means of the laser beam.

Alternatively, it can also be provided that the selected area extends on the contact surface and ends in front of or at an inlet curve for the running or sliding element. This saves machining time, since the run-in rounding itself is excluded from hardening.

According to the invention, it is further provided that the at least one selected area lies adjacent to at least one edge on the contact surface or the at least one selected area lies at a distance from at least one adjacent edge on the contact surface. As a result, the edge itself remains unhardened or at least largely unhardened, so that the edge still has a certain ability to absorb pressure. For example, the edge can also have a ductile structure, whereas the hardness layer is then formed in the adjoining area of the contact surface. The edge can be a marginal edge, for example a longitudinal edge.

The configuration according to claim 4 saves processing time, since not the entire contact area is laser irradiated. By merely irradiating the strip or strips with a laser, the hardened layer formed is interrupted at least once or several times. This also effectively counteracts any possible crack formation, for example coming over the hardened strip or the hardened strips.

Since the strip or strips run in the direction of their longitudinal extension with a changing width, the contact surface can be set in a targeted manner with regard to the expansion of the hardness layer. For example, over length sections of the contact surface with particularly high pressure load from the running or sliding element, the strip or the strips are to be designed with increasing, in particular essentially linearly increasing, width, so that the resulting hardness layer in their Width increases. This increase in the width of the hardened layer counteracts tilting of the running or sliding element engaging it in a particularly effective manner and thus a high positional stability for the running or sliding element is achieved in a simple manner.

The configuration according to claim 5 also prevents the hard layer from breaking out at the edge. The edge can be an edge of the type described above.

The configuration according to claim 6 and also the configuration according to claim 7 are each aimed at the advantages of the configurations of claims 4 and / or 5, the configuration according to claim 6 and the configuration according to claim 7 each being a particularly expedient configuration of the hardness layer.

As a result of the configuration according to claim 7, the laser-treated strips are at a greater distance from one another at one end than at their other end. As a result of this greater distance between the ends, a tilting of the running or sliding element engaging it is particularly counteracted in this area and thus a higher positional stability for the running or sliding element is achieved.

The strips should run away from one another with their longitudinal extension in the direction of the running or sliding movement of the running or sliding element carried out during the pressing process. As a result, the positional stability for the running or sliding element generated by means of the strips increases as the load on the contact surface by the running or sliding element increases. For example, in this case the strips can run on a "V" in the direction of the running or sliding movement of the running or sliding element carried out during the pressing process.

The widths of the strips can be essentially identical to one another. The strips can also be axially symmetrical to one another with respect to the longitudinal center axis of the press jaw.

It is also conceivable that the strips become wider in the direction of the running or sliding movement of the running or sliding element carried out during the pressing process, preferably uniformly and / or equally larger in width to one another. As a result, the surface pressure on the contact surface, which increases during the pressing process as the path of the running or sliding element increases, is taken into account in order to achieve effective wear protection through the hardness layer.

Another possible embodiment of the invention is that the press jaw has a die and adjoining end faces, which each serve to form a closing joint, and has at least one contact side with a contact surface against which a running or sliding element, such as a drive roller , can be brought into operative contact, and several selected areas are laser-irradiated, of which selected areas lie in the transition from the die to one of the end faces, in the transition from the die to the other of the end faces and / or on the contact surface. In this way, the particularly wear-relevant areas of a press jaw are taken into account and are laser-treated in order to form the desired near-surface hardness layer.

1. i) Herstellen zweier Pressbacken durch zweifache Ausführung eines Verfahrens der vorstehend beschriebenen Art
2. ii) Verbinden der Pressbacken mittels eines Zwischengliedes zu einem Presswerkzeug.

The invention further comprises a method for producing a pressing tool with steps for:

1. i) Production of two press jaws by performing a method of the type described above twice
2. ii) connecting the pressing jaws by means of an intermediate link to form a pressing tool.

In addition, the invention comprises a pressing tool which can be or is produced by a method of the type described above.

Further goals, advantages, features and possible applications of the present invention emerge from the following description of several exemplary embodiments with reference to the drawing. In this case, all of the features described and / or shown in the figures, individually or in any meaningful combination, form the subject matter of the present invention, regardless of their summary in the claims or their reference.

Fig. 1

eine mögliche Ausführungsform eines Presswerkzeuges zum Verbinden von Werkstücken mittels Umformen in perspektivischer Darstellung,

Fig. 2

eine mögliche Ausführungsform einer Pressbacke für ein Presswerkzeug gemäß der Figur 1 in perspektivischer Darstellung,

Fig. 3

die Pressbacke gemäß der Figur 2 in Seitenansicht,

Fig. 4

die Pressbacke gemäß der Figur 2 in Unteransicht, wobei Bereiche einer Matrize und einer Kontaktseite nach einem ersten Muster mittels eines Laserstrahles behandelt wurden,

Fig. 5

einen Ausschnitt der Pressbacke gemäß der Figur 2 im Bereich seiner Matrize, wobei dort ausgewählte Bereiche nach einem weiteren Muster mittels eines Laserstrahls behandelt wurden,

Fig. 6, 7, 8, 9 und 10

jeweils einen Ausschnitt der Pressbacke gemäß der Figur 2 im Bereich seiner Kontaktseite, wobei ausgewählte Bereiche der Kontaktseite nach unterschiedlichen Mustern mittels eines Laserstrahles behandelt wurden.

Show it:

Fig. 1

a possible embodiment of a pressing tool for joining workpieces by means of forming in a perspective view,

Fig. 2

a possible embodiment of a press jaw for a press tool according to FIG Figure 1 in perspective view,

Fig. 3

the press jaw according to the Figure 2 in side view,

Fig. 4

the press jaw according to the Figure 2 in bottom view, with areas of a die and a contact side being treated according to a first pattern by means of a laser beam,

Fig. 5

a section of the press jaw according to FIG Figure 2 in the area of his die, where selected areas were treated according to a further pattern by means of a laser beam,

Figures 6, 7, 8, 9 and 10

each a section of the press jaw according to FIG Figure 2 in the area of its contact side, with selected areas of the contact side being treated according to different patterns by means of a laser beam.

Figure 1 shows - in a schematic representation - a possible embodiment of a pressing tool 100, which is used to connect workpieces by means of forming. The Press tool 100 has two press jaws 1 and 1 'which are pivotably mounted on an intermediate member 110 so that press jaws 1 and 1' act in the manner of pliers.

The pressing jaws 1 and 1 'are preferably designed essentially identically. The longitudinal extension of the press jaws 1 and 1 'protrude on both sides over the intermediate member 110, the press jaws 1 and 1' each having a contact side 5 on one protruding side and a die 2 each on their other protruding side.

An active surface is formed by the die 2, by means of which the pressing jaws 1 and 1 'are pressed against a seated between them (and in the Figure 1 not shown) press pipe to be pressed, for example a pipe connection. The respective die 2 is designed, for example, as a half cylinder, with the die 2 in the closed state, as it is in FIG Figure 1 is shown, by the mutually opposite end faces of the respective dies 2 closing joints 120 and 130 are formed.

The contact side 5 of the pressing jaws 1 and 1 'is designed so that a running or sliding element, such as a drive roller, can be brought into operative contact thereon. The running or sliding element can be part of a drive device for actuating the pressing tool 100. When the pressing tool 100 is actuated, the pressing jaws 1 and 1 ′ are moved in the area of their die 2 in the direction towards one another. For this purpose, the respective contact side 5 can be designed with a corresponding slope, so that to carry out the actuation of the pressing jaws 1 and 1 ', the running or sliding element can move in the direction according to arrow 200 on the contact side 5.

Figure 2 shows an example of a press jaw 1.1, which for example in the press tool 100 according to FIG Figure 1 can be used. The press jaw 1.1 according to the Figure 2 differs from the press jaws 1 and 1 'according to FIG Figure 1 for example, in that the die 2 forms a polygonal half-cylinder. However, the die 2 can also have any other geometry.

The die 2 of the pressing jaw 1.1 also has, for example, at least two circumferential sections, in particular three circumferential sections 26, 27 and 28, of which the circumferential sections 26 and 28 have a different diameter than the circumferential section 27, the diameters of the circumferential sections 26 and 28 in relation to one another Are essentially the same.

End faces 3 and 4 adjoin the die 2 on both sides with their end faces 7 and 8, which each serve to form the closing joint 120 and 130, respectively.

Figure 3 FIG. 11 shows the areas of a press jaw that are particularly stressed during pressing, as they are used in the press tool 100, using the press jaw 1.1 according to FIG Figure 2 . In the Figure 3 the sections 12, 13 and 14 which are particularly stressed are marked for this purpose by the distances 12, 13 and 14 drawn at a distance from the press jaw 1.1.

It is provided that a laser beam acts on at least one or two of these sections 12, 13 and 14 in order to to form a hard layer close to the surface. It can also be provided that the sections 12, 13 and 14 are all laser-beamed.

Figures 4 to 10 show examples of the laser treatment of sections 12, 13 and / or 14.

The Figure 4 shows the press jaw 1.1 in a view from below. The press jaw 1.1 was acted upon by a laser beam in several selected areas 12.1, 13.1 and 14.1, so that a hard layer 40 close to the surface has formed in each of the selected areas 12.1, 13.1 and 14.1. The selected area 12.1 lies in the transition from the die 2 to the end face 3, which is used to form the closing joint 120. The selected area 13.1 lies in the transition from the die 2 to the end face 4, which is used to form the closing joint 130. The end faces 3 and 4 each adjoin the die 2 at the end with respect to the outer circumference.

The transition from the die 2 to the face 3 and the transition from the die 2 to the face 4 are preferably arranged at essentially the same distance from the central axis 19 of the die 2. In the transition from the die 2 to the face 3 and in the transition from the die 2 to the face 4, the selected area 12.1 and the selected area 13.1 each extend into the opposite edges 10 and 11, which preferably form marginal edges.

Another selected area 14.1, which has been laser-treated, relates to the contact surface 6 of FIG Contact side 5. The hardness layer 40 is also formed there as a result of the laser treatment. The selected area 14.1 there also extends into the opposite edges 10 and 11. For example, the selected area 14.1 extends beyond the arched section 9 of the inlet rounding 25.

The Figure 5 shows a further embodiment of a press jaw 1.2 as a cutout in the area of the die 2.

Components of the press jaw 1.2 according to Figure 5 , which with the press jaw 1.1 according to the Figures 2 to 4 are identical are provided with the same reference numerals; in this respect, reference is made to the description of the press jaw 1.1.

The press jaw 1.2 according to the Figure 5 differs from the press jaw 1.1 according to Figure 4 Among other things, in that in the transition from the die 2 to the face 3 and also in the transition from the die 2 to the face 4, only sections 15, 16 and 17, 18 with the smallest distance to the central axis 19 of the die 2 were laser irradiated, so that the hard layer 40 has only formed there.

The Figure 6 shows a press jaw 1.3 as a cutout in the area of its contact surface 6. The press jaw 1.3 according to FIG Figure 6 differs from the press jaw 1.1 according to Figure 4 inter alia in that a selected area 14.3 has been laser-irradiated, which only extends up to or in front of the curved section 9 of the inlet rounding 25. The curved section 9 thus still has a ductile structure, for example, whereas the hardness layer 40 has formed on the remaining contact surface 6.

The Figure 7 shows another press jaw 1.4 as a cutout in the area of its contact surface 6. The press jaw 1.4 according to FIG Figure 7 differs from the press jaw 1.3 according to Figure 6 inter alia in that a selected area 14.4 has been laser-treated, which is on the contact surface 6, but already ends at a distance in front of the opposing longitudinal edges 10 and 11. The selected area 14.4 can lie, for example, in the manner of a single strip 20 on the contact surface 6, for example in that the strip 20 was generated by continuously advancing the laser beam.

The individual strip 20 preferably runs in the direction of the running or sliding movement of a running or sliding element.

The Figure 8 shows another press jaw 1.5 as a cutout in the area of its contact surface 6. The press jaw 1.5 differs from the press jaw 1.4 according to FIG Figure 7 inter alia in that a selected area 14.5 has been laser irradiated on the contact surface 6, which area extends in two strips 21 and 22. It is provided that the strips 21 and 22 are spaced apart from one another, in particular are at essentially the same distance from one another, and run with their longitudinal extent in the direction of the running or sliding movement of the running or sliding element.

At least one of the strips 21 and 22 preferably has a constant width in the direction of its longitudinal extension. The strips 21 and 22 can each have a constant width in the direction of their longitudinal extension. It is also conceivable that the strips 21 and 22 are designed to be essentially identical in width to one another.

The Figure 9 shows yet another press jaw 1.6 as a cutout in the area of its contact surface 6. The press jaw 1.6 according to FIG Figure 9 differs from the press jaw 1.5 according to Figure 8 inter alia in that there is a selected area 14.6 on the contact surface 6, which is formed by two strips 23 and 24, the strips 23 and 24 running away from one another, preferably forming a V-shape.

The strips 23 and 24 preferably run away from one another in the direction of the running or sliding movement of the running or sliding element according to arrow 200 carried out during the pressing process.

The strips 23 and 24 can extend in their longitudinal extension up to or up to the inlet rounding 25, in particular up to, up to or over its curved section 9.

The strips 23 and 24 each have a constant width in the direction of their longitudinal extension. The strips 23 and 24 are preferably designed to be essentially identical in width to one another. The strips 23 and 24 can also be axially symmetrical to one another with respect to the longitudinal center axis 29 of the press jaw 1.6.

In contrast to the press jaw 1.6 of the Figure 9 show the Figure 10 a press jaw 1.7 with a laser-treated selected area 14.7 on the contact surface 6, which is formed by two strips 23 'and 24' running away from each other is formed, the strips 23 'and 24' each having a width that changes in the direction of their longitudinal extension.

The strips 23 'and 24' preferably run away from one another in the direction of the running or sliding movement of the running or sliding element according to arrow 200 carried out during the pressing process, the strips 23 'and 24' simultaneously increasing in width in this direction, preferably uniformly and / or to each other in the same way become larger in their width.

List of reference symbols

1, 1 '

Press jaw

1.1

Press jaw

1.2

Press jaw

1.3

Press jaw

1.4

Press jaw

1.5

Press jaw

1.6

Press jaw

1.7

Press jaw

2

die

3

Front side

4th

Front side

5

Contact page

6th

Contact area

7th

Face

8th

Face

9

Arch section

10

Edge

11

Edge

12th

section

12.1

selected area

12.2

selected area

13th

section

13.1

selected area

13.2

selected area

14th

section

14.1

selected area

14.3

selected area

14.4

selected area

14.5

selected area

14.6

selected area

14.7

selected area

15th

section

16

section

17th

section

18th

section

19th

Central axis

20th

Stripes

21

Stripes

22nd

Stripes

23

Stripes

23 '

Stripes

24

Stripes

24 '

Stripes

25th

Inlet rounding

26th

Circumferential section

27

Circumferential section

28

Circumferential section

29

Longitudinal central axis

40

Hardness layer

100

Pressing tool

110

Intermediate link

120

Closing joint

130

Closing joint

200

arrow

Claims (12)

1. Method for producing a pressing tool (100), having steps which follow after one another in the stated order:

   i) an at least partially hardenable blank being formed to the finished size of a pressing jaw (1.1; 1.2),

   ii) at least one selected region (12.1; 13.1; 12.2; 13.2) of the surface of the pressing jaw (1.1; 1.2) being impinged on by means of a laser beam in order to form a hardness layer (40) which is close to the surface,

   wherein the pressing jaw (1.1; 1.2) has a die (2) and at least one end side (3; 4), which is used to form a closing join (120; 130), and the at least one selected region (12.1; 13.1; 12.2; 13.2) lies so as to adjoin at least one edge or so as to be spaced apart from at least one adjacent edge in the transition of the die (2) to the end side (3; 4), such that the edge itself remains unhardened or at least largely unhardened and the edge still has a certain pressure absorption capacity.
2. Method according to Claim 1, characterized in that, in the transition of the die (2) to the end side (3; 4), only the portion or the portions (15, 16; 17, 18) having the smallest distance from the centre axis (19) of the die (2) is or are subjected to laser irradiation.
3. Method for producing a pressing tool (100), having steps which follow after one another in the stated order:

   i) an at least partially hardenable blank being formed to the finished size of a pressing jaw (1.1; 1.3; 1.4; 1.5; 1.6; 1.7),

   ii) at least one selected region (14.1; 14.3; 14.4; 14.5; 14.6; 14.7) of the surface of the pressing jaw (1.1; 1.3; 1.4; 1.5; 1.6; 1.7) being impinged on by means of a laser beam in order to form a hardness layer (40) which is close to the surface,

   wherein the pressing jaw (1.1; 1.3; 1.4; 1.5; 1.6; 1.7) has at least one contact side (5) with at least one contact area (6), against which a running or sliding element can be brought into operative contact, and the at least one selected region (14.1; 14.3) lies so as to adjoin at least one edge (10, 11) on the contact area (6) or the at least one selected region (14.4; 14.5; 14.6; 14.7) lies so as to be spaced apart from at least one adjacent edge (10, 11) on the contact area (6), such that the edge (10; 11) itself remains unhardened or at least largely unhardened and the edge (10; 11) still has a certain pressure absorption capacity.
4. Method according to Claim 3, characterized in that, on the contact area (6), at least one strip (20), preferably at least two or more strips (21, 22; 23, 24; 23', 24'), in particular by way of continuous advancement, is/are irradiated, and preferably the strip (20) or the strips (21, 22; 23, 24; 23', 24') runs/run in each case with constant width or with varying width in the direction of their longitudinal extent.
5. Method according to Claim 4, characterized in that the strip (20) or the strips (21, 22; 23, 24; 23', 24') lies/lie at a predefined distance from at least one edge (10, 11), in particular marginal edge of the contact side (5), which runs in the direction (arrow 200) of the running or sliding movement of the running or sliding element.
6. Method according to Claim 4 or 5, characterized in that the strips (21, 22) run, in particular spaced apart from one another, with their longitudinal extent in the direction (arrow 200) of the running or sliding movement of the running or sliding element.
7. Method according to Claim 4 or 5, characterized in that the strips (23, 24; 23', 24') run away from one another, in particular run away from one another in the shape of a V, with their longitudinal extent in the direction (arrow 200) of the running or sliding movement of the running or sliding element.
8. Method according to one of the preceding claims, characterized in that the pressing jaw (1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7) comprises or is composed of a metal alloy, in particular comprises or is composed of steel, in particular comprises or is composed of high-grade steel.
9. Method according to one of the preceding claims, characterized in that the hardness layer (40) has a thickness of approximately 0.2 mm to approximately 1.5 mm, in particular 0.5 mm to 1.2 mm.
10. Method for producing a pressing tool (100), having steps for:

    i) producing two pressing jaws (1, 1') by carrying out a method according to one of the preceding claims twice,

    ii) connecting the pressing jaws (1, 1') by means of an intermediate element (110) to form a pressing tool (100).
11. Pressing tool (100) with a pressing jaw (1.1; 1.2), having a die (2), at least one end side (3; 4) for forming a closing join (120; 130) and a hardness layer (40) which is close to the surface, wherein the hardness layer (40) which is close to the surface is formed as a result of at least one selected region (12.1; 13.1; 12.2; 13.2) of the surface of the pressing jaw (1.1; 1.2) being impinged on by means of a laser beam, and the at least one selected region (12.1; 13.1; 12.2; 13.2) lies so as to adjoin at least one edge or so as to be spaced apart from at least one adjacent edge in the transition of the die (2) to the end side (3; 4), such that the edge itself remains unhardened or at least largely unhardened and the edge still has a certain pressure absorption capacity.
12. Pressing tool (100) with a pressing jaw (1.1; 1.3; 1.4; 1.5; 1.6; 1.7), having at least one contact side (5) with at least one contact area (6), against which a running or sliding element can be brought into operative contact, and having a hardness layer (40) which is close to the surface, wherein the hardness layer (40) which is close to the surface is formed as a result of at least one selected region (14.1; 14.3; 14.4; 14.5; 14.6; 14.7) of the surface of the pressing jaw (1.1; 1.3; 1.4; 1.5; 1.6; 1.7) being impinged on by means of a laser beam, and the at least one selected region (14.1; 14.3) lies so as to adjoin at least one edge (10; 11) on the contact area (6) or the at least one selected region (14.4; 14.5; 14.6; 14.7) lies so as to be spaced apart from at least one adjacent edge (10; 11) on the contact area (6), such that the edge (10; 11) itself remains unhardened or at least largely unhardened and the edge (10; 11) still has a certain pressure absorption capacity.

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