WO2017140837A1

WO2017140837A1 - Thread rolling head

Info

Publication number: WO2017140837A1
Application number: PCT/EP2017/053604
Authority: WO
Inventors: Adam Beben; Christian Gutsche; Stefan Janke; Raphael Lienau
Original assignee: Lmt Fette Werkzeugtechnik Gmbh & Co. Kg
Priority date: 2016-02-19
Filing date: 2017-02-17
Publication date: 2017-08-24
Also published as: DE202016100891U1

Abstract

The invention relates to a thread rolling head, comprising at least two thread rollers (12) mounted for rotation about respective axes, wherein a processing region (24) for the thread-forming processing of a workpiece is formed between the thread rollers (12), wherein a flushing component (28) is arranged on the thread rolling head, wherein at least one fluid channel connected to a flushing fluid supply is formed within the flushing component (28), and wherein the at least one fluid channel leads to at least one fluid outlet opening of the flushing component, through which fluid outlet opening fluid exits into the processing region (24) during the operation of the thread rolling head.

Description

Thread Rolling Head

The invention relates to a thread rolling head comprising at least two threaded rollers each rotatably mounted on an axis, wherein between the thread rolls a machining area for the thread forming machining of a workpiece is formed.

For example, EP 0 811 443 B1 discloses a tangential thread rolling head. In addition, axial and radial thread rolling heads are known. Thread rolling heads are used in machine tools and are exposed to chips from machining processes. While the threading process is carried out without cutting, in such machine tools, the threading process preceded by machining operations is performed. In this course, chips can be deposited on the thread rolling head, in particular the thread rolls. If a chip is located between the thread rolls and the workpiece to be machined, overpressure can occur during the threading process, and in the worst case, a breakage of the thread roll and thus a malfunction of the thread rolling head.

Based on the explained prior art, the invention has for its object to provide a thread rolling head of the type mentioned, in which also minimizes the risk of malfunction in cutting processes, increases the service life and the processing result can be improved.

The invention achieves the object by the subject matter of the independent claim 1. Advantageous embodiments can be found in the dependent claims, the description and the figures.

For a thread rolling head of the type mentioned above, the invention solves the problem in that a flushing component is arranged on the thread rolling head, wherein at least one fluid channel connected to a flushing fluid supply is formed within the flushing component, and wherein the at least one fluid channel opens into at least one fluid outlet opening of the flushing component through which fluid exits into the machining area during operation of the thread rolling head.

The threaded rollers may be in engagement with a gear coupling the threaded rollers, in particular a synchromesh. The axes of rotation of the thread rollers can be parallel to each other. In the thread rolling head according to the invention, a flushing component is arranged on the thread rolling head. Within the flushing component, at least one fluid channel connected to a flushing fluid supply is formed. The at least one fluid channel is connected to at least one fluid outlet opening of the flushing component. During operation of the thread rolling head, fluid exits through the at least one fluid outlet opening under pressure into the processing region of the thread rolling head. The machining area is the area where the workpiece is located and threading engagement with the thread rolls of the thread rolling head. The flushing component may for example consist of a plastic or a metal material. The flushing fluid may in particular be a flushing fluid. The flushing fluid may also have a cooling effect. In particular, it may be a rinsing and cooling liquid, such as water and / or oil.

By fiction, contemporary flushing a removal of possibly collecting chips is guaranteed safe during the processing process. At the same time, a cooling of the components involved in the processing of the thread rolling head and possibly the machined workpiece can be done. The risk of tool failure is minimized. The service life is increased and the processing result improved. According to one embodiment, at least one fluid channel formed in the flushing component can change its direction once or several times within the flushing component. This configuration provides great flexibility with regard to the arrangement of the fluid channels, in particular the discharge direction of the fluid in the processing area and thus also with regard to the design of the flushing component.

According to a further embodiment, the flushing component may have a plurality of fluid outlet openings, through which fluid escapes in different directions into the processing area during operation of the thread rolling head. In this way, the flushing fluid can be brought more targeted to the required locations of the processing area by the flushing fluid is directed from different directions to the processing area.

Within the flushing component, a main fluid channel connected to the flushing fluid inlet and a plurality of distribution fluid channels branching from the main fluid channel and opening into the plurality of fluid outlet openings may be formed. Due to this embodiment, only one transfer opening to the fluid supply or the thread rolling head is required despite flexible and multiple application of the flushing fluid in the processing area. In this case, the main fluid channel and / or in particular the Verteilfluidkanäle within the Spülbauteils their direction one or more times.

According to a further embodiment, it may be provided that the flushing component has a base body attached to the thread rolling head and at least one flushing arm projecting from the base body, wherein at least one of the distributing fluid channels is formed within the at least one flushing arm, and at the end of the at least one rinsing arm at least one of the fluid outlet openings is formed. Also, the main body may have a plurality of fluid outlet openings, wherein the main fluid channel and a plurality of distributing fluid channels opening into the fluid outlet openings are formed in the base body. It is also possible to provide a plurality of rinsing arms, for example two or more than two rinsing arms. The rinse arms extend in different directions starting from a main body of the rinse component attached to the thread rolling head. The rinse arms can change direction one or more times. Correspondingly, the distribution fluid passages formed in the rinsing arms also change their direction once or several times. In this way, poorly accessible areas of the processing area can be safely supplied with flushing fluid. Also, the main body of the flushing component may have a plurality of fluid outlet openings. The main body may for example have a flat basic shape and be attached to the thread rolling head, for example by screwing.

According to a further embodiment it can be provided that in the thread rolling head a fluid supply channel is formed, the first end of which opens into a first transfer opening connected to the at least one fluid channel formed in the flushing component and the second end of which opens into a second transfer opening connected to the flushing fluid supply , The main fluid channel of the flushing component may be connected to the first transfer opening. The fluid supply channel in the thread rolling head may have been introduced by drilling, for example.

According to a further embodiment it can be provided that a roll head holder holding the thread rolling head is provided, in which a fluid supply channel is likewise formed, whose first end opens into a third transfer opening connected to the second transfer opening of the fluid supply channel formed in the thread rolling head, and whose second end opens the flushing fluid supply is connected. The roll head holder may for example be fork-shaped, wherein the thread rolling head with a holding portion between the Forks of the rolling head holder is clamped. The roll head holder may for example consist of a metal material.

The fluid supply channel formed inside the rolling head holder can change its direction once or several times. By this configuration, there is great flexibility in the arrangement of the fluid supply channel in the roll head holder. By also having great flexibility with regard to the arrangement of the fluid channels in the flushing component, the thread rolling head transfer openings can be chosen such that the fluid supply channel can be formed in the thread rolling head, for example by drilling, and thus with less flexibility with regard to the channel geometry.

According to a further embodiment, at least one of the transfer openings may be sealed by a sealing ring against a fluid outlet. In particular, all transfer openings between the flushing component and the thread rolling head as well as between the thread rolling head and the rolling head holder can be sealed by a sealing ring. The sealing ring may be an O-ring in a particularly practical manner. The sealing ring may for example consist of a rubber material or plastic.

The sealing ring can furthermore be arranged or held in an annular groove of the rolling head holder and / or the threaded rolling head and / or the flushing component. The sealing ring is then clamped between the adjacent components and thus ensures the required sealing.

In order to achieve the flexibility according to the invention with regard to the configuration of the fluid channels, it is particularly advantageous if the flushing component and / or the roll head holder have been produced in layers in an additive process. In particular, they can be produced in a 3D printing process by using a form of material applied in layers and constructed by selective melting or sintering of the discharged material of the rolling head holder and / or the Spülbauteil. In particular, a laser melting or laser sintering can be used. It is possible in this way a precise production with the greatest flexibility. Thus, substantially arbitrarily shaped internal fluid channels can be formed with one or multiple changes of direction in the flushing component or the roll head holder, which can not be produced by drilling. As a result, the transfer of the flushing fluid from the rolling head holder can be realized in a simple manner via the conventionally produced thread rolling head, for example, into the flushing component. In particular, the transfer openings in the rolling head holder and in the flushing component can be freely selected so that the supply channel can be produced by drilling, for example, in the thread rolling head which is not produced in an additive manner. The embodiments explained above with the main fluid channel and a plurality of fluid distribution channels in the flushing component as well as the formation of flushing arms on the flushing component can thus be implemented in a simple manner. The same applies, for example, to the formation of annular grooves for receiving sealing rings.

The thread rolling head according to the invention may be a tangential thread rolling head. The thread rolling head may comprise two fork-shaped rolling head arms, in each of which one of the thread rolls is received. The threaded rollers can be inserted laterally into a mounting position in the rolling head arms before installation of the axes, in which one of the axes can be inserted into a bearing bore of the thread rollers. But it may also be an axial thread rolling head or a Radialge winderollkopf. Accordingly, it is possible that the thread rolling head comprises a rolling head holder on which three thread rollers are rotatably mounted. According to a further embodiment, the rolling head arms may be pivotally mounted on the rolling head holder about a common, parallel to the roller axes axis, wherein adjusting means are provided for adjusting the pivotal position of the rolling head arms on the rolling head holder. However, it is also possible that the rolling head arms are not movable relative to each other, in particular are not pivotable.

Embodiments of the invention will be explained in more detail with reference to figures. They show schematically:

1 shows a thread rolling head according to the invention in a perspective view,

2 shows the thread rolling head of FIG. 1 in a plan view, FIG. 3 shows a sectional view along the line A-A in FIG. 2,

4 shows a flushing component of the thread rolling head shown in FIG. 1 in a perspective view, FIG.

5 shows the flushing component from FIG. 4 in a partially transparent view, FIG.

6 is a perspective view of the thread rolling head of FIG. 1 without Spülbauteil in a perspective view,

7 shows the thread rolling head from FIG. 1 without roll head holder in a perspective view, FIG. 8 shows the rolling head holder of the thread rolling head shown in FIG. 1 in a perspective view, FIG.

9 shows the roll head holder shown in FIG. 8 in a further perspective view, FIG.

10 is an enlarged view of the section A in Fig. 9,

11 shows the roll head holder from FIG. 9 in a further partially transparent representation, FIG.

FIG. 12 shows the roll head holder from FIG. 9 in a longitudinally sectioned view, and FIG

13 is an enlarged view of the detail B of FIG. 12th

Unless otherwise indicated, like reference characters designate like items throughout the figures.

The thread rolling head according to the invention shown in Figures 1 to 3 has a first forked Rollkopfarm 10 in which a first thread roller 12 is rotatably mounted. A second threaded roller 14 is rotatably mounted in a second forked rolling head arm 16. The threaded rollers 12, 14 are coupled together via a synchronous transmission. The rolling head arms 10, 16 are attached to a likewise forked roll head holder 18. The roll head holder 18 is connected to a clamping section 20 for clamping in a machine tool, as can be seen in Fig. 3 at reference numeral 22. The thread rolling head shown in FIGS. 1 to 3 is a tangential thread rolling head. Between the thread rollers 12, 14, a processing area 24 for machining a workpiece not shown in detail is formed. For processing, for example, a cylindrical workpiece is delivered to the processing area 24 and processed thread forming between the thread rollers 12, 14. The structure and function of such Tangentialrollkopfes are known per se and will not be explained in detail.

According to the invention, a flushing component 28 is fastened to a machining area 24 facing, to be recognized in Fig. 6 inner surface 26 of the thread rolling head, in this case screwed ver, as shown in Fig. 1 for one of the screw connections 30. The flushing member 28 is shown in more detail in Figures 4 and 5. It has a relatively flat base body 32 which is screwed through holes 34, 36 on the inner surface 26 of the thread rolling head. In the example shown, two flushing arms 38, 40 are integrally connected to one another. The ends 42 and 44 of the flushing arms 38, 40 are bent over the main section of the flushing arms 38, 40, upward in FIG. 4, and open into fluid outlet openings 46 , 48. As can be seen, for example, in FIG. 1, these fluid outlet openings 46, 48 in FIG. 1 are directed from below onto the processing area 24. In addition, the main body 32 of the flushing component 28 likewise comprises a plurality of fluid outlet openings 50, which are likewise directed in the processing region 24 in different directions in the mounted state. In particular, in Fig. 5 it can be seen that the base body 32 has on its rear side an inlet opening 52, with which a main fluid channel 54 is connected. From the main fluid channel 54 branch off a plurality of distribution fluid channels 56, which are each connected to one of the fluid outlet openings. During operation of the thread rolling head, in this way a flushing fluid, for example a flushing fluid, is discharged from different directions into the machining area 24 and chips produced in this way during machining are removed and, at the same time, a cooling effect generated. In the base body 32 of the flushing member 28 may further be formed cavities for weight reduction.

In addition, a fluid supply channel is formed in the thread rolling head, through which the flushing fluid is supplied to the flushing component 28, in particular the inlet opening 52, during operation. For this purpose, a first transfer opening 58 communicating with the fluid supply channel is formed on the inner surface 26 of the thread rolling head (FIG. 6), which is aligned with the inlet opening 52 of the flushing component 28 in the state of the flushing component 28 mounted on the thread rolling head. The other end of the formed in the threaded roller head fluid supply channel opens into a particular in Fig. 7 to be recognized second transfer port 60. The second transfer port 60 is adjacent to a threaded hole 62 into which a threaded bolt 64 is screwed for attaching the roll head holder 18 to the thread rolling head , In Fig. 8, the rolling head holder 18 is shown disassembled from the thread rolling head state, wherein the rolling head holder 18 is shown in Fig. 8 from the bottom. In FIG. 8, a third transfer opening 66 can be seen, which comes into coincidence with the second transfer opening 60 of the thread rolling head in the state of the rolling head holder 18 mounted on the thread rolling head. Also in the roll head holder 18, a fluid supply channel is formed, which in this case partially extends through the chucking section 20 through to a supply opening 68 to be seen in FIG. 8. This is connected in operation to a flushing fluid pressure supply.

The fluid supply channel formed in the fork-shaped roll head holder 18 is shown in dashed lines in FIG. 11 at reference numeral 70. At the reference numeral 71, a transfer opening for transferring the fluid from the chucking section 20 can be seen. Visible changes the fluid supply channel 70, as well as the channels formed in the Spülbauteil 28 once or more times its direction. On In this way, the transfer openings to the thread rolling head can be flexibly arranged such that the fluid supply channel formed in the thread rolling head can be introduced by drilling, for example.

Both the flushing component 28 shown in the figures and the rolling head holder 18 shown in the figures have been constructed in layers in an additive 3D printing process. In this way, the channels generated within these components can be flexibly formed with a wide variety of geometries. Both components can consist of a metal material. However, it is also possible that one or both of said components consist of a plastic.

In the enlarged view of FIG. 10, it can also be seen that the third transfer opening 66 formed in the rolling head holder 18 is surrounded by an annular groove 72. In particular, in the enlarged view of Fig. 13 it can be seen that in the annular groove 72, a sealing ring 74, in particular an O-ring, is arranged for sealing the transition to the thread rolling head. The sealing ring 74 may be held by an interference fit in the annular groove 72, for example. Such sealing rings, optionally including such annular grooves, may be provided at all transfer points between the different components.

LIST OF REFERENCE NUMBERS

10 First roll head arm

12 First thread roll

14 Second thread roll

16 second roll head arm

18 roll head holder

20 clamping section

22 clamping

24 processing area

26 inside surface

28 flushing component

30 screw connection

32 basic body

34 bore

36 bore

38 rinsing arm

40 rinsing arm

42 end

44 end

46 fluid outlet opening

48 fluid outlet opening

50 fluid outlet openings

52 entrance opening

54 main fluid channel

56 distribution fluid channels

58 First handover opening

60 Second handover

62 threaded hole Threaded bolt Third transfer port Supply port Fluid supply port Transfer port Ring groove

seal

Claims

claims

1. Thread rolling head comprising at least two each on an axis rotatably mounted thread rolls (12, 14), wherein between the thread rollers (12, 14) a processing area (24) for the thread forming machining of a workpiece is formed, characterized in that at the thread rolling head a flushing member (28) is arranged, wherein within the flushing component (28) at least one connected to a flushing fluid supply fluid channel is formed, and wherein the at least one fluid channel in at least one fluid outlet opening (46, 48, 50) of the flushing member (28) opens through the Operation of the thread rolling head fluid in the processing area (24) emerges.

2. Thread rolling head according to claim 1, characterized in that at least one in the flushing member (28) formed fluid channel within the flushing member (28) once or more changes its direction.

3. Thread rolling head according to one of claims 1 or 2, characterized in that the flushing member (28) has a plurality of fluid outlet openings (46, 48, 50) through which emerges during operation of the thread rolling head fluid in different directions in the processing area (24) ,

4. Thread rolling head according to claim 3, characterized in that within the Spülbauteils (28) connected to the Spülfluidversorgung a main fluid passage (54) and a plurality of the main fluid passage (54) branches off and into the plurality of fluid outlet openings (46, 48, 50). opening distribution fluid channels (56) are formed.

5. Thread rolling head according to claim 4, characterized in that the flushing component (28) has a thread rolling head attached to the base body (32) and at least one of the base body (32) outgoing, on the processing area (24) directed flushing arm (36, 38) wherein at least one of the Verteilfluidkanäle (56) is formed within the at least one rinsing arm (36, 38), and at least one of the fluid outlet openings (46, 48) is formed at the end (42, 44) of the at least one rinsing arm (36, 38) is.

6. Thread rolling head according to claim 5, characterized in that the base body (32) has a plurality of fluid outlet openings (50), and that the main fluid channel (54) and a plurality of the fluid outlet openings (50) opening Verteilfluidkanäle (56) formed in the base body (32) are.

7. Thread rolling head according to one of the preceding claims, characterized in that in the thread rolling head, a fluid supply channel is formed, the first end in a connected to the at least one in the flushing member (28) fluid passage first transfer port (58) opens and its second end in a second transfer opening (60) connected to the flushing fluid supply opens.

8. Thread rolling head according to claim 7 and one of claims 4 to 6, characterized in that the main fluid channel (54) of the flushing member (28) is connected to the first transfer opening (58).

9. Thread rolling head according to one of claims 7 or 8, characterized in that a rolling head holder (18) holding the thread rolling head is provided, in which also a fluid supply channel (70) is formed, whose first end in one with the second transfer opening (60) of in the thread rolling head formed fluid supply channel (70) connected third transfer port (66) opens, and the second end is connected to the Spülfluidvers orgung.

10. Thread rolling head according to claim 9, characterized in that within the roll head holder (18) formed fluid supply channel (70) once or more changes its direction.

11. Thread rolling head according to one of the preceding claims, characterized in that at least one of the transfer openings (58, 60, 66) by a sealing ring (74) is sealed against fluid leakage.

12. Thread rolling head according to claim 11, characterized in that the sealing ring (74) in an annular groove (72) of the rolling head holder (18) and / or the thread rolling head and / or the flushing member (28) is arranged.

13. Thread rolling head according to one of the preceding claims, characterized in that the flushing member (28) and / or the rolling head holder (18) have been produced in layers in an additive process.

14. Thread rolling head according to one of the preceding claims, characterized in that it comprises two fork-shaped rolling head arms (10, 16), in each of which one of the thread rolls (12, 14) is received.

15. Thread rolling head of claim 14, characterized in that the rolling head arms are pivotally mounted on the rolling head holder about a common, parallel to the roller axes axis, wherein adjusting means are provided for adjusting the pivotal position of the rolling head arms on the rolling head holder.