RADIAL PRESS

Abstract

A housing of a radial press has a casing section and an annular end-face support disc. An annular structure is movably guided in the housing along a press axis, and multiple press jaws arranged about the press axis are supported on the support disc so as to be movably guided in the radial direction. The annular structure acts on the press jaws by means of control surfaces which are inclined relative to the press axis and which lie against press jaw counter surfaces designed in the form of sliding surfaces. The end face of the ring structure facing the support disc is designed with axial protrusions. Each control surface protrudes into the radial inner surface of one such protrusion, and the support disc has recesses which are paired with the protrusions and into which the protrusions enter when the radial press is closed.

Claims

1. A radial press with a housing (1) having a jacket portion (6) and an end-face annular bracing disk (7), an annular structure (2) guided displaceably therein along a press axis (X) and several press jaws (3), which are disposed around the press axis (X) and which are braced in radially displaceably guided manner on the bracing disk (7) and on which the annular structure (2) acts by means of control faces (14), which are inclined relative to the press axis (X) and bear against mating faces of the press jaws (3) constructed as sliding faces (13), wherein: the annular structure (2) is constructed in crown-shaped manner on its end face (23) turned toward the bracing disk (7) and has a number of axial projections (24) corresponding to the number of press jaws (3), wherein each control face (14) extends into the radial inner face (25) of such a projection (24) and wherein further the bracing disk (7) has recesses (28), which are associated with the projections (24) and into which the projections (24) are inserted during closing of the radial press.

2. The radial press of claim 1, wherein the recesses (28) are constructed as through holes (29).

3. The radial press of claim 1, wherein press attachments (45) having pressing faces (47) offset relative to the axial center (M) of the mating faces (13) are mounted on the press jaws (3).

4. The radial press of claim 3, wherein the press attachments (45) are mounted on the press jaws (3) in the region of their ends turned toward the bracing disk (7).

5. The radial press of claim 4, wherein the press attachments (45) are inserted into end-face receptacles (43) of the press jaws (3).

6. The radial press of claim 1, wherein the annular structure (2) comprises an annular-structure base body (15) and exchangeable sliding plates (16), wherein the control faces (14) are constructed on the surface of the sliding plates (16).

7. The radial press of claim 6, wherein the sliding plates (16) bear with their rear side turned away from the respective control face (14) on a bracing face (19), which is constructed on the annular-structure base body (15).

8. The radial press of claim 6, wherein the annular structure (2) further comprises control bodies, which are mounted exchangeably on the annular-structure base body (15) and have bracing faces, on which the sliding plates (16) bear with their rear side turned away from the respective control face (14).

9. The radial press of claim 7, wherein the bracing faces (19) respectively comprise two support portions (20, 21), which are separated from one another by a depression (22) situated between them.

10. The radial press of claim 9, wherein the depression (22) tapers out respectively before the end face (26) of the associated projection (24).

11. The radial press of claim 1, wherein the control faces (14) bear, in planes perpendicular to the press axis (X), respectively on a polygon having corners disposed respectively between two mutually adjacent press jaws (3).

12. The radial press of claim 11, wherein the radial press is a one-stage radial press, wherein the control faces (14) are of flat construction.

13. The radial press of claim 11, wherein the radial press is a two-stage radial press, wherein the control faces (14) are of stepped construction.

14. The radial press of claim 1, wherein press-jaw guide ribs (27) constructed respectively on the annular structure (2) are provided between two press jaws (3).

15. The radial press of claim 14, wherein first guide elements, preferably guide slots (39), in which corresponding second guide elements constructed on the press jaws (3) engage, are constructed on the press-jaw guide ribs (27).

16. The radial press of claim 1, wherein the annular structure (2) comprises an annular piston (32), which is guided sealingly in a press-cylinder portion (33) constructed in the jacket portion (6) of the housing (1) and together with this bounds an annular press working chamber (35).

17. The radial press of claim 16, wherein an annular return-stroke working chamber (36) is disposed between the press working chamber (35) and the bracing disk (7), and is bounded by a cylindrical face (38) disposed on the outer circumference of the annular structure (2) and guided in a sealing shoulder (37) integral with the housing.

18. The radial press of claim 17, wherein the jacket portion (6) of the housing (1) has a debris discharge opening between the sealing shoulder (37) and the bracing disk (7).

19. The radial press of claim 16, wherein the press working chamber (35) is bounded by a housing-closure ring (8) disposed opposite the bracing disk (7) and a sleeve-like extension (34) of the annular structure (2) guided sealingly in it.

20. The radial press of claim 1, wherein the bracing disk (7) and the jacket portion (6) are part of a one-piece housing base structure (5).

21. The radial press of claim 1, wherein exchangeable guide elements (11) cooperating with the press jaws (3) are mounted on the bracing disk (7).

Description

BRIEF DESCRIPTION OF THE DRAWING

[0018] The present invention will be explained in more detail in the following on the basis of an exemplary embodiment illustrated in the drawing, wherein:

[0019] FIG. 1 shows an axial section through a one-stage radial press constructed according to the invention with completely opened die,

[0020] FIG. 2 shows an axial section through the radial press according to FIG. 1 with completely closed die, and

[0021] FIG. 3 shows a perspective view of the annular-structure base body of the radial press according to FIGS. 1 and 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The hydraulic radial press shown in the drawings comprises as main components a substantially rotationally symmetric housing 1, an annular structure 2 guided displaceably therein along axis X and a press die 4 having eight press jaws 3 disposed around press axis X. Housing 1 comprises a one-piece housing base structure 5 with a jacket portion 6 and an end-face annular bracing disk 7 as well as a housing closure ring 8 disposed opposite bracing disk 7 in the jacket structure and fixed there. Press jaws 3 are bracedin radially displaceably guided manner via guide elements 11 (sliding blocks) mounted on bracing disk 7 by means of respectively two screws 9 and cooperating with guide slots 10 provided on press jaws 3on bracing disk 7, wherein respectively one friction-reducing bearing plate 12 is disposed between the end faces of press jaws 3 and bracing disk 7. On the radial outside, press jaws 3 have sliding faces 13. These form mating faces for control faces 14, which are provided on annular structure 2 in a manner inclined relative to press axis X and which cooperate with sliding faces 13 in such a way that an axial displacement (arrow A) of annular structure 2 in the direction of bracing disk 7 induces a radially inwardly directed movement (arrow B) of press jaws 3.

[0023] To the extent explained in the foregoing, the radial press according to FIGS. 1 to 3 corresponds to the well-known prior art disclosed in the documents mentioned in the introduction and cited as reference here, so that more extensive explanations are not needed.

[0024] Annular structure 2 has an annularly closed annular-structure base body 15 and eight flat sliding plates 16 mounted exchangeably thereon. These sliding plates 16 are fixed on annular-structure base body 15 by means of a clamping ring 18 acting on end-face, bent-over edges 17 of sliding plates 16. These sliding plates 16 respectively bearwith their rear side turned away from the respective control face 13on an associated, likewise substantially flat bracing face 19 of annular-structure base body 15. These bracing faces 19 respectively comprise two support portions 20, 21, which are separated from one another by a depression 22 situated between them.

[0025] On its front end 23 turned toward bracing disk 7, annular-structure base body 15 is constructed in crown-shaped manner, in that it has eight axial projections 24 there. Bracing faces 19 functioning as bracing for the sliding plates respectively extend into the radial inner face 25 of such a projection 24; and also the sliding plates 16 bearing on bracing faces 19 extend correspondingly, so that each control face 14 also extends as a result into the radial inner face 25 of the respectively associated projection 24. In contrast to the construction shown in FIG. 3, recesses 22 may taper respectively before end face 26 of the associated projection 24. What is evident in FIG. 3 is that the press-jaw guide ribs 27 are constructedrespectively between two mutually adjacent bracing faces 19on annular-structure base body 15, with guide slots 39, which are provided on them and are designed for cooperation with corresponding guide projections provided laterally on the press jaws.

[0026] Bracing disk 7 has eight recesses 28, which correspond to projections 24 of annular structure 2 and are associated therewith, and into which projections 24 are inserted during closing of the radial press (see FIG. 2). These recesses 28 are constructed as through holes 29, which respectively lead toward the free end face 30 of bracing disk 7 into an opening 31.

[0027] A double-acting hydraulic drive is used for movement of annular structure 2. For this purpose, annular structure 2 comprises an annular piston 32, which is guided sealingly in a cylindrical portion 33 constructed in jacket portion 6 of housing 1. Cylindrical portion 33, annular piston 32, housing-closure ring 8 and a sleeve-like extension 34 of annular-structure base body 15 guided sealingly in this together bound an annular press working chamber 35. This can be pressurized via a press port 40. An annular return-stroke working chamber 36 is disposed between press working chamber and bracing disk 7. This is bounded by cylindrical portion 33 (which also bounds press working chamber 35), an annular zone constructed on annular piston 32 on its end face turned away from press working chamber 35, a sealing shoulder 37 integral with the housing and a cylindrical face 38 guided in this and disposed on the outer circumference of annular-structure base body 15. Return-stroke working chamber 36 can be pressurized via a return-stroke port 41.

[0028] The exemplary embodiment illustrated in the drawing is a so-called calibration press. For this purpose, press jaws 3 are constructed in specific manner, in that they respectively have a recess 42 on their end face turned toward bracing disk 7. This forms a receptacle 43 for a press attachment 45 inserted into it and fixed by means of screw 44. A press face 47designed for cooperation with the workpiece to be pressedis provided at the radial inside on press attachment 45 on a narrow, inwardly directed collar 46. What is readily perceptible is the arrangement of press faces 47 directly adjacent to bracing disk 7 and thus offset particularly severely relative to axial center M of mating faces 13 of press jaws 3.

[0029] However, it is also immediately obvious that a modification of the shown radial press is possible to the effect that a press attachment (with press face configured in any desired different manner depending on press task) can be mounted respectively at the radial insidein replaceable manner for change of the press diameteron the (modified) press jaws 3 in a conventional way known as such.