METHOD AND DEVICE FOR PRODUCING A HOSE NIPPLE

Abstract

The invention relates to the production of profiled hose nipples. The invention was based on the object of providing a method and an apparatus which allow hose nipples of the type outlined in the introduction to be produced in a simple manner such that the formation of burrs is avoided and there is no reduction in diameter. This object is achieved in that during the forming of pipe portions (1) in the apparatus (2, 7, 9) according to the invention in the region of the subsequent ring-shaped webs (4) of the nipple profile (3), the material of the pipe portion (1), at its outwardly pointing end (4), does not come into contact with the tool in the region of the parting joints (6) of the apparatus (2, 7). This can be realized by additional cavities (14) in the tool (2, 7).

Claims

1-3. (canceled)

4. A production method for profiled hose nipples, the method comprising: providing a divisible forming tool (2) having at least two tool parts (7), wherein the tool parts (7) each have at least one cutout which forms an elongate cavity when the tool parts (7) are assembled, wherein the cutouts are each profiled in such a way that when the tool parts are assembled, the elongate cavity has a profile (11) of predetermined geometry with radially inwardly projecting ring-shaped webs (12) and radially outwardly pointing ring-shaped grooves (13); inserting a pipe portion into the elongate cavity; pressing or drawing a forming punch into the pipe portion, wherein the forming punch is designed in such a way that when it is being pressed or drawn into the pipe portion, the diameter of the pipe portion increases and the material of the pipe portion is radially outwardly displaced into the profile of the elongate cavity, and that, in the region of the tool partings (6), a distance remains between the pipe portion material that is displaced into the radially outwardly pointing ring-shaped grooves (13) of the profile and the tool wall; opening the tool; removing the pipe portion which has been formed into a hose nipple (1).

5. An apparatus for producing a hose nipple (1), the apparatus comprising at least one at least two-part forming tool (2, 7) and at least one forming punch, wherein forming tool parts (7) of the at least two-part forming tool each have at least one cutout, and when the forming tool parts (7) are assembled, the cutouts form at least one elongate cavity which is suitable for accommodating a respective end of a pipe portion (1) with a predetermined geometry; wherein the elongate cavity has a profile (11) which has radially inwardly projecting ring-shaped webs (12) and radially outwardly pointing ring-shaped grooves (13, 14); wherein the radially outwardly pointing ring-shaped grooves (13) have, at their end zone assigned to the outward direction, additional cavities at least in the region of the tool parting (6); wherein the at least one forming punch is designed in such a way that it is pressed into the pipe portion (1); wherein a diameter of the forming punch corresponds to the predetermined geometry of the pipe portion (1) in such a way that when the forming punch is being pressed or drawn in, the pipe portion (1) can be deformed to have a diameter greater than its initial diameter, whereby material of the wall of the pipe portion (1) can be pressed outward; wherein the material that is pressed outward engages in the profile (11) of the elongate cavity and can be formed into a shape (3), which corresponds to the profile (11), of the pipe portion (1) in such a way that the material comes into contact with the inwardly projecting ring-shaped webs (12), and the material which is pressed into the outwardly pointing ring-shaped grooves (13) penetrates the ring-shaped grooves (13) in such a way that a distance remains between the pressed material of the pipe portion (1) and the tool (2, 7) as a result of the additional cavities (14).

6. The apparatus as claimed in claim 5 further comprising a ring-shaped forming tool part (9) which is in the form of a non-split ring, and wherein an opening (10) of the ring (9) can be pressed in an axially flush manner onto the pipe portion (1, 8) inserted into the elongate cavity of the split forming tool.

7. An apparatus for producing a hose nipple (1), the apparatus comprising at least one at least two-part forming tool (2, 7) and at least one forming punch, wherein forming tool parts (7) of the at least two-part forming tool each have at least one cutout, and when the forming tool parts (7) are assembled, the cutouts form at least one elongate cavity which is suitable for accommodating a respective end of a pipe portion (1) with a predetermined geometry; wherein the elongate cavity has a profile (11) which has radially inwardly projecting ring-shaped webs (12) and radially outwardly pointing ring-shaped grooves (13, 14); wherein the radially outwardly pointing ring-shaped grooves (13) have, at their end zone assigned to the outward direction, additional cavities at least in the region of the tool parting (6); wherein the at least one forming punch is designed in such a way that it is drawn into the pipe portion (1); wherein a diameter of the forming punch corresponds to the predetermined geometry of the pipe portion (1) in such a way that when the forming punch is being pressed or drawn in, the pipe portion (1) can be deformed to have a diameter greater than its initial diameter, whereby material of the wall of the pipe portion (1) can be pressed outward; wherein the material that is pressed outward engages in the profile (11) of the elongate cavity and can be formed into a shape (3), which corresponds to the profile (11), of the pipe portion (1) in such a way that the material comes into contact with the inwardly projecting ring-shaped webs (12), and the material which is pressed into the outwardly pointing ring-shaped grooves (13) penetrates the ring-shaped grooves (13) in such a way that a distance remains between the pressed material of the pipe portion (1) and the tool (2, 7) as a result of the additional cavities (14).

8. The apparatus as claimed in claim 7 further comprising a ring-shaped forming tool part (9) which is in the form of a non-split ring, and wherein an opening (10) of the ring (9) can be pressed in an axially flush manner onto the pipe portion (1, 8) inserted into the elongate cavity of the split forming tool.

Description

[0026] An exemplary embodiment of the invention will be discussed in more detail below on the basis of the drawing. FIG. 1 shows, in the upper part, a finished hose nipple 1 which is arranged in an apparatus 2 according to the invention in the lower part of the FIGURE. Forming of the hose nipple 1 has already been concluded in this illustration, and so a forming punch is not shown here.

[0027] The hose nipple 1 has a profile 3 which has ring-shaped webs 4 and profile troughs 5. In the illustration, the line 6 denotes a parting plane or a parting joint of the apparatus 2, the parting plane being illustrated rotated through 90° as a partial longitudinal section of the apparatus 2 in the lower part of the FIGURE.

[0028] In the region of the parting joint 6, the profile troughs 5 have burrs (not illustrated here). By contrast, the webs 4 do not have any burrs in the region of the parting joint 6.

[0029] The apparatus 2 shown in the lower part of FIG. 1 has 2 tool halves, of which only one tool half 7 is shown here as a partial section. Arranged in the end region 8 of the apparatus 2 is a further tool part 9 which has an opening 10 of closed ring-shaped form which opens conically in the direction of the inserted hose nipple 1.

[0030] The tool halves 7 have a virtually tooth-like profile 11 in section. Inwardly projecting teeth 12 alternate with radially outwardly pointing grooves 13 in an axial direction. Arranged at the respectively radially external end of the grooves 13 is a respective cavity 14 which is present only in the region of the parting joint of the tool halves.

[0031] During the forming of the hose nipple 1, which has already been carried out in this illustration, the original diameter of the pipe-like hose nipple 1 was increased, wherein the radial extent of the hose nipple 1 is delimited by the tool halves 7 and the further tool part 9. In this case, the increase in diameter is determined in advance such that the material of the hose nipple 1 can indeed be pressed into the profile 11 of the apparatus 2 but a distance between the hose nipple 1 and the apparatus 2 remains in the region of the cavities 14. This means that, in this region of the parting joint, the ring-shaped webs 4 do not come into contact with the tool at their axial end and thus no burrs can be produced in this region either. In this way, the crucial load-bearing webs 4 remain free of burrs, with the result that a tube (not shown here) capable of being pushed on can be pushed onto the hose nipple 1 without being damaged.

[0032] This is further improved by the formation of a burr-free run-on bevel 15 by means of the tool part 9.

LIST OF REFERENCE DESIGNATIONS

Part of the Description

[0033] 1 Hose nipple [0034] 2 Apparatus [0035] 3 Profile of the hose nipple 1 [0036] 4 Ring-shaped webs of the profile 3 [0037] 5 Profile troughs of the profile 3 [0038] 6 Parting joint [0039] 7 Tool half of the apparatus 2 [0040] 8 End region of the apparatus 2 [0041] 9 Further tool part [0042] 10 Conical opening of the tool part 9 [0043] 11 Tooth-like profile of the tool half 7 [0044] 12 Teeth of the profile 11 [0045] 13 Grooves of the profile 11 [0046] 14 Cavities at the axially outer end of the grooves 13 [0047] 15 Run-on bevel