PRESS DIE FOR A PRESSING TOOL FOR PRESSING ROUND TUBULAR WORKPIECE SECTIONS

Abstract

A press die for a pressing tool for pressing round tubular sections of at least two workpieces has a through-hole with a circumferential die surface. It includes at least two die parts. Each of the at least two die parts comprises a circumferential section of the through-hole. At least one of the die parts comprises a round target contour over at least one region of the associated circumferential section of the through-hole. At least one other die part comprises a contour deviating from the round target contour over at least one region of the associated circumferential section of the through-hole. Thus, the circumferential sections of the through-hole associated with the at least two die parts are asymmetrical relative to each other with respect to a chord formed by the associated circumferential section of the through-hole.

Claims

1.-19. (canceled)

20. A press die (1) for a pressing tool (100) for pressing round tubular sections of at least two workpieces, comprising: a front side (2); a rear side (3); and a through-hole (4) extending from the front side (2) to the rear side (3), the through-hole (4) comprising a front opening (5) on the front side (2), a rear opening (6) on the rear side (3), and a circumferential surface (7), which is formed as a die surface, wherein the press die (1) is constructed of multiple parts including at least two die parts (8, 9) and comprises two closing points (10, 11), wherein each of the closing points (10, 11) is formed by mutually associated end faces (8.1, 8.2, 9.1, 9.2) of mutually adjacent die parts (8, 9) of the at least two die parts (8, 9), and wherein each of the at least two die parts (8, 9) comprises a circumferential section of the through-hole (4), such that, in a closed position (A) of the at least two die parts (8, 9) at the closing points (10, 11), the circumferential surface (7) of the through-hole (4) is assembled on the circumference, wherein at least one of the at least two die parts (8, 9) comprises a round target contour (8.3) over at least one subsection (8.4) of an associated circumferential section of the through-hole (4) and at least one other die part (9) of the at least two die parts comprises a contour (9.3) deviating from the round target contour (8.3) over at least one other subsection (9.4) of the associated circumferential section of the through-hole (4), such that the circumferential sections of the through-hole (4) associated with the at least two die parts (8, 9) are asymmetrical relative to each other with respect to a chord (8.7, 9.7) formed by an associated circumferential section of the through-hole (4).

21. The press die according to claim 20, wherein the contour (9.3) deviating from the round target contour (8.3) is straight.

22. The press die according to claim 20, wherein the contour (9.3) deviating from the round target contour (8.3) forms at least one side of a polygon, and wherein at least one part of the polygon forms the circumferential section of the through-hole (4), which is enclosed by the at least one other die part (9).

23. The press die according to claim 22, wherein the polygon is a hexagon and the circumferential section of the through-hole (4) formed by the at least one other die part (9) at least partially comprises at least three sides of the hexagon.

24. The press die according to claim 20, wherein the round target contour (8.3) is interrupted by an area (8.5) with an additional contour (8.8) deviating from the round target contour (8.3).

25. The press die according to claim 24, wherein the additional contour (8.8) deviating from the round target contour (8.3) is straight and is arranged parallel to and spaced apart from the chord (8.7) of the associated at least one die part (8).

26. The press die according to claim 20, wherein the at least one subsection (8.4) adjoins one of the mutually associated end faces (8.1, 8.2) of the at least one die part (8), and wherein the at least one other subsection (9.4) adjoins the corresponding end face (9.1) of the at least one other die part (9).

27. The press die according to claim 20, wherein the round target contour (8.3) of the at least one die part (8) and the contour (9.3) of the at least one other die part deviating from the round target contour (8.3) are provided in an area of the front opening (5) of the press die (1) and wherein in an area of the rear opening (6) of the press die (1) a formation of the at least one die part (8) and the at least one other die part (9) is reversed with respect to a formation in the area of the front opening (5).

28. The press die according to claim 27, wherein the at least two die parts (8, 9) between the area of the front opening (5) and the area of the rear opening (6) contain a groove-shaped recess (12) in the respective circumferential section of the through-hole (4) on the circumference.

29. The press die according to claim 27, wherein the at least one die part (8) and the at least one other die part (9) are common parts.

30. A press die (1.1) for a pressing tool (100) for pressing round tubular sections of at least two workpieces, comprising: a front side (2); a rear side (3); and a through-hole (4) extending from the front side (2) to the rear side (3), the through-hole (4) comprising a front opening (5) on the front side (2), a rear opening (6) on the rear side (3), and a circumferential surface (7), which is formed as a die surface, wherein the press die (1.1) is constructed of multiple parts including at least three die parts (28, 29, 30) and comprises at least three closing points (12, 13, 14), wherein each of the at least closing points (12, 13, 14) is formed by mutually associated end faces (28.2, 29.1; 29.2, 30.1; 30.2, 28.1) of mutually adjacent die parts (28, 29; 29, 30; 30, 28) of the at least three die parts (28, 29, 30) adjacent to each other, and wherein each of the at least three die parts (28, 29, 30) comprises a circumferential section of the through-hole (4), such that, in a closed position (A) of the at least three die parts (28, 29, 30) at the at least three closing points (12, 13, 14), the circumferential surface (7) of the through-hole (4) is assembled on the circumference, wherein at least one of the die parts (28, 29, 30) comprises the round target contour (28.3) over at least one subsection (28.4) of the associated circumferential section of the through-hole (4) and at least one other of the die parts (28, 29, 30) comprises the contour (29.3) deviating from the round target contour (28.3) over at least one subsection (29.4) of the associated circumferential section of the through-hole (4), such that the circumferential sections of the through-hole (4) associated with the at least three die parts (28, 29, 30) are asymmetrical relative to each other with respect to a chord (28.7, 29.7, 30.7) formed by the associated circumferential section.

31. The press die according to claim 30, wherein the at least one die part (28) comprises the round target contour (28.3), and each of at least two other of the die parts (28, 29, 30) comprises the contour (29.3, 30.3) deviating from the round target contour (28.3).

32. A press die (1) for a pressing tool (100) for pressing round tubular sections of at least two workpieces, comprising: a front side (2); a rear side (3); and a through-hole (4) extending from the front side (2) to the rear side (3), the through-hole (4) comprising a front opening (5) on the front side (2), a rear opening (6) on the rear side (3), and a circumferential surface (7), which is formed as a die surface, wherein the press die (1) is constructed in several parts including at least two die parts (8, 9) and comprises at least two closing points (10, 11), wherein each of the at least two closing points (10, 11) is closed by mutually associated end faces (8.1, 8.2, 9.1, 9.2) of mutually adjacent die parts (8, 9) of the at least two die parts (8, 9), and wherein each of the at least two die parts (8, 9) comprises a circumferential section of the through-hole (4) over a circumferential angle (1, 2), such that, in a closed position (A) of the at least two die parts (8, 9) at the at least two closing points (10, 11), the circumferential surface (7) of the through-hole (4) is assembled on the circumference, wherein, with at least one of the die parts (8, 9) on a predominant part of the circumferential angle (1), the associated circumferential section has a contour (8.3) with an essentially uniform angle-related circumferential length and, on a remaining part of the associated circumferential angle (1), a proportionally greater circumferential length is formed.

33. The press die according to claim 32, wherein the circumferential length formed across the die parts (8, 9) is proportional to the circumferential angle (1, 2) occupied by the respective die part (8, 9).

34. The press die according to claim 32, wherein adjoining the at least one die part (8) is a die part (9), with which the angle-related circumferential length varies over the associated circumferential angle (2).

35. A pressing tool (100) for pressing round tubular sections of at least two workpieces, wherein the pressing tool (100) comprises the press die (1; 1.1; 1.2) according to claim 20.

36. A method for producing a press connection of round tubular sections of at least two workpieces, comprising the steps: i) providing the pressing tool (100) according to claim 35; ii) sliding the round tubular sections of the workpieces into each other over an axial overlap area; and iii) pressing the round tubular sections in the axial overlap area by means of the pressing tool (100).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG. 1 shows a possible embodiment of a pressing tool in perspective view.

[0049] FIG. 2 an enlarged view of the pressing tool of FIG. 1 in the area of a press die.

[0050] FIG. 3 shows a possible embodiment of a die part of a two-part press die, which can be used for example in the pressing tool of FIGS. 1 and 2, in perspective view.

[0051] FIG. 4 shows another die part of the press die corresponding to the die part in FIG. 3, in perspective view.

[0052] FIG. 5 shows the press die assembled by the die parts of FIGS. 3 and 4 in a view of the front side.

[0053] FIG. 6 shows the press die of FIG. 5 in a view of the rear side.

[0054] FIG. 7 shows a possible embodiment of a press die, comprising three die parts, in a view of the front side of the press die.

[0055] FIG. 8 shows the press die of FIG. 7 in a view of the rear side.

DETAILED DESCRIPTION

[0056] FIG. 1 showsin schematic forma possible embodiment of a pressing tool 100 in a perspective view. The pressing tool 100 has a press die 1, which is constructed in several parts. For example, press die 1 comprises two die parts 8 and 9. FIG. 2 shows the pressing tool 100 in an enlarged view in the area of the press die 1.

[0057] The pressing tool 100 is used for pressing round tubular sections of at least two workpieces. In particular, the pressing tool 100 can be used to press tubular, in particular round tubular workpieces to form an undetachable tube connection. For example, one of the workpieces is a tube or tube section, as the case may be, and another of the workpieces is a press fitting, for example a tube socket, which is pressed against the tube using the pressing tool 100.

[0058] The pressing tool 100 has two pressing jaws 110, 120, wherein one of the pressing jaws 110 and 120 is assigned to one of the die parts 8 or 9, as the case may be, respectively. The pressing jaws 110 and 120 can be swiveled against each other by means of a swivel joint 130, in order to be swiveled relative to each other from an open position, as shown in FIGS. 1 and 2, to a closed position. The open position is used, for example, to pick up the workpieces to be pressed between the die parts 8 and 9. In the closed position, for example, the die parts 8 and 9 are in a closed position relative to each other. The swivel joint 130 can comprise at least one intermediate part 140, on which one of the pressing jaws 110 and 120 is rotatably mounted via a shaft or axle 130.1 and 130.2.

[0059] The die parts 8 and 9 of the press die 1 can be detachably attached to the respective associated pressing jaws 110 or 120, as the case may be. In this respect, the die parts 8 and 9 can be formed as interchangeable inserts. For this purpose, an annular groove 15 can be provided on the outer circumference of the press die 1, which is preferably formed on each of the die parts 8 and 9, in order to be able to insert the respective die part 8 and 9 on the associated pressing jaws 110 or 120, as the case may be, respectively in a correspondingly provided projection 170. The annular groove 15 and the projection 170 secure the die components 8 and 9 in the respective associated pressing jaw 110 or 120, as the case may be, against the lateral sliding out of a fastening position on the associated pressing jaw 110 or 120, as the case may be.

[0060] Preferably, at least one additional coiled spring pin element 180 is used to clamp the respective die part 8 or 9, as the case may be, at the associated pressing jaw 110 or 120, as the case may be, in a force-fitting manner or to fix it by means of positive locking, in order to avoid loosening from the fixing position at the associated pressing jaw 110 or 120, as the case may be, in the radial direction. For this purpose, at least one fixing point 8.6 or 9.6, as the case may be, in particular a receptacle opening for the coiled spring pin element 180, can be provided on the respective die part 8 or 9, as the case may be. Alternatively, the die parts 8 and 9 can also be permanently attached to the respective pressing jaw 110 or 120, as the case may be, for example by forming the die parts 8 and 9 on the respective pressing jaw 110 or 120, as the case may be.

[0061] Preferably, the pressing tool 100 can be coupled with a drive unit (not shown in FIGS. 1 and 2), in particular mechanically coupled, to move pressing jaws 110, 120 from the open position to the closed position. The drive unit can be a manually actuated drive unit or a drive unit actuated by an electric motor or by hydraulic or pneumatic means. The actuating force generated by the actuating device moves the pressing jaws 110, 120 relative to each other. For this purpose, each the pressing jaws 110 and 120 can have a rear part 150 and 160, through which the pressing jaws 110 and 120 are extended backwards, in particular away from the area of the die parts 8 and 9, and each of which forms a lever in relation to the articulated joint 130. As such, it is preferable for at least one coupling point for the actuating device to be provided on each of the rear parts 150 and 160.

[0062] The structure and design of the press die 1 is described in more detail below on the basis of FIGS. 3 to 6. FIG. 3 shows the die part 8 in a perspective view. FIG. 4 likewise shows the die part 9 in a perspective view. FIGS. 5 and 6 show the press die 1 with the die parts 8 and 9 in a front view (FIG. 5) and a rear view (FIG. 6).

[0063] The press die 1 comprises a front side 2, a preferably opposite rear side 3 and a through-hole 4 extending from the front side 2 to the rear side 3. The through-hole 4 comprises a front opening 5 on the front side 2 and a rear opening 6 on the rear side 3 along with a circumferential surface 7, which is formed as a die surface. The designations front and back are arbitrarily chosen and could therefore be exchanged. The same applies to the indications front and rear in relation to openings 5 and 6.

[0064] In addition to the two die parts 8 and 9, which can also be designated as the first die part 8 and second die part 9, the press die 1 comprises two closing points 10 and 11. Each of the closing points 10 and 11 is formed by mutually associated end faces 8.1, 9.1 along with 8.2, 9.2 of the die parts 8, 9, wherein each of the two die parts 8, 9 comprises a circumferential section of the through-hole 4 via a circumferential angle 1, 2, such that, in the closing position A of the two die parts 8, 9 already described above, the circumferential surface 7 of the through-hole 4 is assembled at the closing points 10, 11 on the circumference.

[0065] As can be seen from the example in FIG. 5, one of the die parts 8, 9, for example the die part 8, has a round target contour 8.3 over at least one subsection 8.4 of the circumferential section of the through-hole 4, which belongs to the one of the die parts 8, 9. By contrast, the other die part, in particular the die part 9, has a contour 9.3 deviating from the round target contour 8.3 over at least one subsection 9.4 of the circumferential section of the through-hole 4, which is assigned to such other die part 9. The at least one subsection 8.4 with the round target contour 8.3 and the at least one subsection 9.4 with the deviating contour 9.3 are arranged in such a manner that the circumferential sections of the through-hole 4 associated with the two die parts 8, 9 are asymmetrical relative to each other with respect to a chord 8.7, 9.7 formed by the associated circumferential section of the through-hole 4. Preferably, the areas 8.3 and 9.3 are arranged adjacent to end faces 8.1 and 9.1 respectively.

[0066] The round target contour 8.3 can be formed to be circular or at least have a section of a circular arc. For example, contour 9.3 that deviates from the round target contour 8.3 is formed to be straight. For example, the contour 9.3, which differs from the round target contour 8.3, forms at least one side of a polygon, wherein at least part of the polygon forms the circumferential section of the through-hole 4, which is enclosed by the associated die part 9. For example, the polygon is a hexagon, in particular a rounded hexagon, and the circumferential section of the through-hole 4, which is formed by the associated die part 9, comprises three sides of the hexagon, as can be seen in particular in FIG. 5. In particular, the inside circumferential radius of the hexagon corresponds to the inside radius of the round contour 9.3 in relation to the center axis 19 of the press die 1.

[0067] The round target contour 8.3 can be interrupted by an area 8.5 with an additional contour 8.8 deviating from it. The additional contour 8.8 can likewise be a contour formed to be straight. For example, the additional contour 8.8 is arranged parallel to and spaced apart from the chord 8.7 of the corresponding die part 8. The die part 9 with the additional contour 8.8 can also be described in a generalized manner by the fact that, on a predominant part of the circumferential angle 1, the associated circumferential section of the through-hole 4 has a contour with a uniform angle-related circumferential length and, on a remaining part of the circumferential angle 1, a proportionally greater circumferential length is formed. The angle-related circumferential length refers to the arc length in relation to the circumferential angle in which the arc length of the die part 8 is spanned.

[0068] Preferably, the round target contour 8.3 and the contour 9.3 deviating from it are provided in an area 16 of the front opening 5 of the press die 1, and in an area 17 of the rear opening 6 of the press die 1, the formation of the die parts 8 and 9 is reversed compared to their formation in one area of the front opening 5. In this respect, the arrangement of the die parts 8 and 9 results in the area 17 of the rear opening 6, as shown in FIG. 6. As such, the die parts 8 and 9 are preferably formed as identical parts.

[0069] Preferably, the circumferential surface 7 of the press die 1, which serves as the die surface, has an annular recess 12, in particular an annular groove, between the area 16 of the front opening 5 and the area 17 of the rear opening 6. The recess 12 is used to press a workpiece, such as, for example, a press fitting, which contains a peripheral ribbing with a sealing ring accommodated therein. In this respect, the recess 12 is preferably adapted to the dimensions of this circumferential ribbing on the workpiece.

[0070] The circumferential surface 7 of the press die can be distributed between one area 16 of the front opening 5 and one area 17 of the rear opening 6, such that each of the area 16 and the area 17 forms a constriction, i.e. a projection extending in a radial direction inwards, with respect to the circumferential surface 7 of the press die 1; that is, the surfaces 20, 21 adjacent to the areas 16, 17 are preferably slightly set back radially.

[0071] FIG. 7 shows an additional possible embodiment of a press die 1.1. The press die 1.1 differs from press die 1 of FIGS. 3 to 6, among other things, in that press die 1.1 is constructed by three die parts 28, 29, 30. The die parts 28, 29, 30 can also be designated as the first die part 28, the second die part 29 and the third die part 30. FIG. 7 shows the press die 1.1 in a view of the front side 2. FIG. 8 shows the press die 1.1 in a view of the rear side 3. The press die 1.1 comprises three closing points 12, 13, 14, wherein each of the closing points 12, 13, 14 is formed by end faces 28.2, 29.1 or 29.2, 30.1 or 30.2, 28.1, as the case may be, which are associated relative to each other, of die parts 28, 29 or 29, 30 or 30, 28, as the case may be, of the three die parts 28, 29, 30, which are adjacent relative to each other, and each of the die parts 28, 29, 30 comprises a circumferential section of the through-hole 4, such that, in the closed position A of the die parts 28, 29, 30 at the closing points 12, 13, 14, the circumferential surface 7 of the through-hole 4 is assembled on the circumference.

[0072] As can be seen in FIG. 7, one of the die parts 28, 29, 30, in particular the die part 28, has a round target contour 28.3 over at least one subsection 28.4 of the associated circumferential section of the through-hole 4. Each of the other of the die parts 28, 29 30, in particular the die parts 29, 30, has a contour 29.3 or 30.3, as the case may be, deviating from the round target contour 28.3 over at least one subsection 29.4 or 30.4, as the case may be, of the associated circumferential section of the through-hole 4, such that the three die parts 28, 29 and 30 of associated circumferential sections of the through-hole 4 are asymmetrical relative to each other with respect to a chord 28.7, 29.7, 30.7 formed by the associated circumferential section.

[0073] The round target contour 28.3 of the press die 1.1 can also be formed to be circular. Preferably, the contour 29.3 or 30.3, as the case may be, deviating from this is formed in a straight line; for example, it is formed by a part of a polygon. Preferably, the deviating contour 29.3 or 30.3, as the case may be, is formed at least partially by three sides of a hexagon. The round target contour 8.3 can be interrupted by one area 28.5 with an additional contour 28.8 deviating from it. The additional contour 28.8 can also be a contour that is formed straight. The die parts 28, 29, 30 of the press die 1.1 are preferably formed as identical parts. This results in the arrangement with respect to the reverse side 3 of the press die 1, which is shown in FIG. 8.

LIST OF REFERENCE SIGNS

[0074] 1 Press die [0075] 1.1 Press die [0076] 2 Front side [0077] 3 Rear side [0078] 4 Through-hole [0079] 5 Front opening [0080] 6 Rear opening [0081] 7 Circumferential surface [0082] 8 Die part (first die part) [0083] 8.1 End face [0084] 8.2 End face [0085] 8.3 Round target contour [0086] 8.4 Subsection [0087] 8.5 Area [0088] 8.6 Fixing point [0089] 8.7 Chord [0090] 8.8 Additional contour [0091] 9 Die part (second die part) [0092] 9.1 End face [0093] 9.2 End face [0094] 9.3 Deviating contour [0095] 9.4 Area [0096] 9.6 Fixing point [0097] 9.7 Chord [0098] 10 Closing point [0099] 11 Closing point [0100] 12 Closing point [0101] 13 Closing point [0102] 14 Closing point [0103] 15 Ring groove [0104] 16 Area [0105] 17 Area [0106] 18 Recess [0107] 19 Center axis [0108] 20 Surface [0109] 21 Surface e [0110] 28 Die part (first die part) [0111] 28.1 End face [0112] 28.2 End face [0113] 28.3 Round target contour [0114] 28.4 Subsection [0115] 28.5 Area [0116] 28.7 Chord [0117] 28.8 Additional contour [0118] 29 Die part (second die part) [0119] 29.1 End face [0120] 29.2 End face [0121] 29.3 Deviating contour [0122] 29.4 Sub section [0123] 29.7 Chord [0124] 30 Die part (third die part) [0125] 30.1 End face [0126] 30.2 End face [0127] 30.3 Deviating contour [0128] 30.4 Subsection [0129] 30.7 Chord [0130] 100 Pressing tool [0131] 110 Pressing jaw [0132] 120 Pressing jaw [0133] 130 Articulated joint [0134] 130.1 Axis [0135] 130.2 Axis [0136] 140 Intermediate section [0137] 150 Rear part [0138] 160 Rear part [0139] 170 Projection [0140] 180 Coiled spring pin element [0141] A Closing position [0142] 1 Circumferential angle [0143] 2 Circumferential angle