Electrochemical machining device for machining elongated workpieces

Abstract

The invention relates to an electrochemical machining device (12) for machining elongated workpieces (14), with at least two synchronously movable, vertical telescopic guides (26), with a base (38), which is arranged in the region of a lower end (36) of the telescopic guides (26) and has a lower holder (42) for at least one workpiece (14), and with an upper holder (58) for the at least one workpiece (14), which is vertically adjustable to allow the distance between the holders (42, 58) to be adjusted to the length of the at least one workpiece (14), and with an electrode holder (48), which is fastened to the telescopic guides (26) and can be moved relative to the upper holder (58) by the telescopic guides (26). The invention also relates to an installation (10).

Description

[0001] Electrochemical machining device for machining elongated workpieces

[0002] The invention relates to an electrochemical machining device for machining elongated workpieces.

[0003] The term "elongated workpieces" generally refers to workpieces or sections of workpieces that are relatively narrow relative to their length. These include, for example, tubes, rods, or profiles. It also includes holes and grooves.

[0004] According to the current state of the art, the machining, in particular finishing, of elongated workpieces which are to be machined along their length can be carried out by means of various electrochemical processes.

[0005] One of these is static electrochemical machining. In this method, the cathode is positioned relative to the workpiece and fixed in this position during machining, so that there is no relative movement between the cathode and the workpiece.

[0006] The disadvantage here is that the cathodes required for static electrochemical processing are typically complex to manufacture and therefore extremely expensive.

[0007] Furthermore, the current required for electrochemical machining is proportional to the size of the surface to be machined. Therefore, particularly high currents are required for static machining, as the entire area of ​​the elongated workpiece, and thus a large surface area, is machined.

[0008] For this reason, dynamic electrochemical machining is typically used for elongated components that are to be electrochemically machined along a relatively large area.

[0009] Here, the cathode with the area used to machine the long workpiece is moved along the surfaces of the elongated workpiece that are to be machined.

[0010] In this variant, it is necessary that the cathodes are attached to a holder and moved along a guide.

[0011] For example, if the inside of a pipe is to be reached using the machining area of ​​a cathode, the entire length of the cathode including its rod-like holder corresponds at least to the length of the pipe, so that machining of the inside of the pipe can be realized.

[0012] The cathode is inserted into one of the tube's openings via a processing area, usually thickened at one end of the cathode. Accordingly, the dimensions of an electrochemical processing device are determined by the workpiece itself.

[0013] The machining device with the guide for the cathode holder must therefore be slightly more than twice the length of the elongated workpiece to be machined (assuming the area to be machined extends along the entire length of the workpiece).

[0014] However, this means that the dynamic machining of elongated workpieces requires extremely large and bulky fixtures that take up a lot of space. This makes the assembly, transport, and storage of such fixtures and systems particularly difficult and increases the cost of operating them. Converting systems with corresponding dynamic machining fixtures is also extremely complex due to their size.

[0015] Furthermore, these are typically expensive special devices.

[0016] Based on this, the object of the invention is to provide a device for the dynamic, electrochemical machining of elongated workpieces, which is versatile and variable in use and also has small dimensions.

[0017] The stated object is achieved according to the invention by an electrochemical machining device for machining elongated workpieces, with at least two synchronously movable, vertical telescopic guides, a base which is arranged in the region of a lower end of the telescopic guides and has a lower holder for at least one workpiece, as well as an upper holder for the at least one workpiece, which is vertically adjustable in order to be able to adjust the distance between the holders to the length of the at least one workpiece, and an electrode holder which is fastened to the telescopic guides and can be moved relative to the upper holder by means of the telescopic guides.

[0018] The basic idea of ​​the invention is to replace the previously rigid guide of the electrode holder with a length-adjustable telescopic guide so that the dimensions of the electrochemical machining device can be significantly reduced by retracting the telescopic guide. At the same time, the electrode holder is adjusted using the telescopic guides, meaning no additional drive is required. Furthermore, an upper holder for the at least one workpiece is provided, which is vertically adjustable so that the distance between the holders can be matched to the length of the at least one workpiece. This not only allows the machining device to be quickly adjusted for different workpieces, but by adjusting the upper holder in combination with the telescopic guides, even long workpieces can be machined, yet the machining device can still be compactly collapsed vertically.

[0019] All this simplifies the handling, transport and also the assembly of the electrochemical processing device.

[0020] Furthermore, the telescopic guides allow for continuous adjustment of the overall dimensions of the electrochemical machining device, making an electrochemical machining device with appropriately designed telescopic guides extremely versatile and suitable for a variety of elongated workpieces. Furthermore, the length of the electrochemical machining device can be adjusted during machining so that it only takes up as much space as is actually necessary for machining the elongated workpieces.

[0021] The adjustment of the telescopic guides therefore results in a relative movement between the base and the electrode holder, which causes the dimensions of the entire electrochemical processing device to increase or decrease.

[0022] For example, if the telescopic guides are moved together, the size of the entire electrochemical machining device is reduced, which also makes it easier to handle.

[0023] According to one aspect of the invention, the maximum extended length of the telescopic guides can be at least 1.5 times the maximum retracted length of the telescopic guides. This allows the dimensions of the electrochemical machining device, when not in operation, to be reduced by at least 50% with respect to the telescopic guide.

[0024] Since the electrode holder has to be adjusted during machining at least by the length of the elongated workpiece or the surface to be machined that extends along the elongated workpiece, the maximum extended length of the telescopic guide can be at least twice the maximum retracted length of the telescopic guides, so that the cathodes are in the area of ​​one end of the workpiece when the telescopic guides are at their maximum extended length and in the area of ​​the other, the first opposite end when the telescopic guides are at their maximum retracted length.

[0025] For example, the telescopic guides are formed by piston-cylinder units that serve as a drive for the relative movement of the electrode holder to the base. Consequently, the drive for realizing a relative movement between the electrode holder and the base is already formed by the telescopic guides, and no additional drive is required. The telescopic guides can preferably comprise an outer tube, at least one guided central tube movable relative to the outer tube, and an end-side rod guided on the central tube. One of the group consisting of the outer tube and the rod can be provided on the base, and the other of the group can be provided on the electrode holder.

[0026] The telescopic guides can therefore be designed in three parts. This allows the maximum retracted length to be further reduced compared to a two-part design while maintaining the same maximum extended length, while still allowing the telescopic guide to remain stable even at its maximum extended length.

[0027] Advantageously, the upper mount can be mounted on the telescopic guides for longitudinal displacement. This allows the upper mount to be moved in a controlled manner along the telescopic guides while simultaneously being aligned relative to the base and the electrode mount along the direction of movement of the cathodes. The telescopic guides thus serve a dual function.

[0028] Preferably, the outer tubes are provided at the base and the upper bracket is guided slidably on the outer tube, i.e. at a point with the highest stability of the telescopic guides.

[0029] The outer tubes can thus be optimally stabilized even when extended via the connection to the base, the middle tube and the rod, which means that the telescopic guides form a rigid guide even when fully extended.

[0030] Another positive aspect is that the upper support is attached to the relatively rigid outer tube, as mentioned above, because this also stabilizes the outer tubes relative to each other. Furthermore, this ensures that the telescopic guides only have to move the weight of the electrode holder via the center tubes and the rods when adjusting.

[0031] Advantageously, the base can have a mechanical interface that serves to connect the electrochemical processing device to a system for operating the electrochemical processing device. Consequently, the electrochemical processing device is versatile and can be installed in various systems via the mechanical interface. The telescopic guide is particularly advantageous here, as transporting the electrochemical processing device and installing and removing it from a system are relatively easy due to its compact dimensions when the telescopic guide is retracted.

[0032] Advantageously, the electrode holder can have attachments for multiple electrodes, and the upper and lower holders can have attachments for multiple end pieces. This enables simultaneous machining of multiple workpieces.

[0033] Furthermore, the electrode holder and / or the upper holder can each form a bridge between the telescopic guides.

[0034] This means that both the electrode holder and the upper holder can be adjusted or guided by both telescopic guides.

[0035] In addition, the telescopic guides can be fixed relative to each other by the electrode holder designed as a bridge and / or the upper holder, thus increasing the overall rigidity of the electrochemical machining device.

[0036] Preferably, the upper holder can be movable towards and away from the base by means of a drive which is independent of a drive for the electrode holder.

[0037] Furthermore, the drive can be coupled at one end to the upper holder and at its other end to the base or to the electrode holder or to a housing structure.

[0038] If the drive is attached to the base at its other end, this represents a particularly rigid design. In addition, there is no relative movement between the base and the upper holder during processing, so that the drive only needs to be actuated again when, for example, the workpieces are removed from the electrochemical processing device or when the telescopic guides are to be reduced to the maximum retracted length.

[0039] If the drive is fixed to the electrode holder, the drive is also adjusted during machining and when the telescopic guide is adjusted, depending on the adjustment of the telescopic guides, to compensate for the movements. However, it could be realized that the drive is designed as part of the electrochemical machining device.

[0040] If the drive is connected to a housing structure, this represents a particularly rigid design, similar to that described with regard to the base.

[0041] Furthermore, the one or more electrodes attached to the electrode holder may be cathodes.

[0042] Advantageously, one or more electrolyte connections are provided on the base, which are fluidly connected to the at least one lower holder in such a way that electrolyte can be introduced into and / or discharged from a tubular workpiece to be machined.

[0043] If the electrolyte can be fed in and out, a particularly simple electrolyte circuit can be realized.

[0044] Furthermore, one or more electrolyte connections can be provided on the upper holder, each of which is fluidly connected via a tubular workpiece to be machined to the one electrolyte connection or the several electrolyte connections of the at least one lower holder in such a way that the tubular workpiece to be machined can be flowed through by electrolyte along a flow direction.

[0045] The electrolyte flows from the electrolyte connections of the upper holder through the workpiece(s) to be machined to the electrolyte connections of the lower holder. This ensures that the workpiece to be machined is always supplied with "fresh" electrolyte. This has a positive effect on the quality of the machining process and can also provide sufficient cooling capacity via the electrolyte. Preferably, at least one sealing cover is provided to seal the transition between the electrode and the workpiece or between the electrode and the upper holder.

[0046] This ensures that the electrolyte does not leak out during the machining process when the workpiece is filled with electrolyte or has electrolyte flowing through it.

[0047] Generally, the machining device can be used for internal or external machining of an elongated workpiece. For internal machining, the workpiece is hollow inside. For external machining, the workpiece must be inserted into a tube on the outside so that the electrolyte flows between the outside of the workpiece and the inside of the tube. The movable electrode is a cylinder that moves along the workpiece with a gap on the outside. The electrode holder is a tube or several rods distributed around the circumference.

[0048] In order to create a flow of electrolyte during external or internal machining of the workpiece, one or more electrolyte connections are provided on the upper holder, each of which is fluidly connected via a workpiece to be machined to the one electrolyte connection or the several electrolyte connections of the at least one lower holder in such a way that electrolyte flows along the workpiece to be machined.

[0049] During internal machining, the electrolyte flows through the interior of the workpiece; during external machining, it flows in the annular gap between the outside of the workpiece and the holder surrounding the outside of the workpiece.

[0050] For example, at least one sealing cover is provided which seals the transition between the electrode and the workpiece or between the electrode and the upper holder.

[0051] The object mentioned at the outset is also achieved by a system with a hydraulic electrolyte circuit, a pump, an interface for non-destructively fastening and detaching a base of an electrochemical machining device according to the invention, as well as an electrolyte connection for detachably coupling the hydraulic electrolyte circuit to the electrochemical machining device fastened in the system, and a controller which is designed to control the electrochemical machining device.

[0052] The interface ensures quick and easy installation and removal of the electrochemical processing device.

[0053] The invention is described below with reference to an embodiment illustrated in the accompanying drawings, in which:

[0054] - Figure 1 is a perspective view of a plant with an electrochemical machining device according to the invention;

[0055] - Figure 2 shows a section along the section plane ll-ll in Figure 1;

[0056] - Figure 3 is a front view of the electrochemical machining device according to the invention with maximum extended length;

[0057] - Figure 4 is a perspective view of the electrochemical machining device according to the invention with its maximum retracted length; and

[0058] - Figure 5 is a front view of the electrochemical machining device according to the invention with maximum extended length.

[0059] Figures 1 and 2 show a system 10 with an electrochemical machining device 12 for machining elongated workpieces 14.

[0060] The elongated workpieces 14 in the figures are tubes 16. However, these represent only one example of elongated workpieces and generally represent elongated workpieces 14 that are machined externally or internally.

[0061] Furthermore, the system 10 comprises a housing structure 17 within which the electrochemical processing device 12 is accommodated. Furthermore, a hydraulic electrolyte circuit 18 with a pump 20 is provided, which can be detachably connected to the electrochemical processing device 12 via an electrolyte connection 22, so that the electrolyte circuit 18 is closed via the electrochemical processing device 12.

[0062] The system 10 also includes a mechanical interface 24 to which the electrochemical processing device 12 can be non-destructively attached to and detached from the rest of the system 10.

[0063] In addition, a controller 25 is provided which is designed to control the electrochemical processing device.

[0064] The electrochemical machining device 12 has two synchronously movable, vertical telescopic guides 26. These are particularly clearly visible in Figures 3 to 5, in which only the electrochemical machining device 12 is shown.

[0065] In Figures 3 and 4, the maximum extended telescopic guides 26 have the length L ma x, while the maximum retracted telescopic guides 26 in Figure 5 have a length L m in have.

[0066] The telescopic guides 26 are each formed by piston-cylinder units 28.

[0067] These piston-cylinder units 28 each comprise an outer tube 30, a central tube 32 guided in the outer tube 30 so as to be movable relative to the outer tube 30, and a rod 34 guided in the central tube 32.

[0068] Alternatively, it is also conceivable that the piston-cylinder units 28 each consist of only one outer tube 30 and one rod 34, or alternatively have an outer tube 30 which is coupled to the rod 34 via any number of central tubes 32.

[0069] The rod 34 can be either a tube or a component made of solid material.

[0070] Furthermore, a base 38 is arranged in the region of a lower end 36 of the telescopic guides 26, to which the outer tubes 30 are attached. The base 38 has a plurality of electrolyte connections 40.

[0071] The base 38 also has a lower holder 42 for at least one workpiece 14. In the present case, fastenings 43 for several workpieces are provided on the lower holder 42, by which the workpieces 14 are fixed during the machining process.

[0072] The electrolyte connections 40 are designed in such a way that electrolyte can be introduced into or discharged from the workpieces to be machined, here tubular, via the fastenings 43 of the lower holder 42.

[0073] Furthermore, a mechanical interface 44 (here the underside of the base 38) is provided on the base 38 of the electrochemical processing device 12, which can be coupled to the interface 24 on the system 10 (here the top side of a table) so that the processing device 12 can be connected to the system 10 and can also be operated via it (see Figures 1 and 2).

[0074] In addition, an electrode holder 48 is arranged in the region of an upper end 46 of the telescopic guides 26.

[0075] The electrode holder 48 forms a bridge 50 between the telescopic guides 26 and has attachments 52 for a plurality of electrodes 54 in the form of cathodes 56. These cathodes 56 can be configured to form the entire rod projecting downward from the electrode holder 48, or to be merely a thickened lower end on a rod, which in turn is attached to the associated electrode holder 48.

[0076] The electrode holder 48 is connected to the rods 34 of the telescopic guides 26 and can be moved by adjusting the telescopic guides 26. The piston-cylinder units 28 thus serve as a drive for the relative movement of the electrode holder 48 to the base 38.

[0077] Furthermore, the electrochemical machining device 12 includes an upper mount 58. The upper mount 58 forms a bridge between the telescopic guides 26, here the outer tubes 30, and is vertically adjustable along the telescopic guides 26 (here the outer tubes 30). The upper mount 58 serves to hold the ends of the workpieces 14 facing away from the base 38. For this purpose, fastenings 59 for several workpieces are provided on the upper mount 58, by which the workpieces 14 are fixed during the machining process.

[0078] To adjust the distance between the lower holder 42 and the upper holder 58, the upper holder 58 is vertically adjustable. This allows the workpieces 14 to be machined to be inserted and removed after machining.

[0079] In addition, the upper holder 58 has guide bushings 62 at the ends of the bridge in each case towards the telescopic guides 26, via which the upper holder 58 is mounted so as to be longitudinally displaceable along the telescopic guide 26.

[0080] According to Figures 3 to 5, the upper holder 58 can be slidably guided on the outer tubes 30 by means of the guide bushings 62.

[0081] Alternatively or additionally, it is also conceivable that the upper bracket 58 is slidably guided on the center tube 32 via the guide bushings 62.

[0082] A drive 64 (see Figure 2) is provided for adjusting the upper holder 58. This allows the upper holder 58 to be adjusted relative to the base 38 independently of the electrode holder 48, which is adjustable via the telescopic guides 26.

[0083] The drive 64 is coupled at one end 66 to the upper bracket 58.

[0084] With its end 68 facing away from the upper bracket 58, the drive 64 is connected to the housing structure 17 of the system 10, so that the drive 64 is assigned to the system 10.

[0085] Alternatively, it is also conceivable that the drive 64 is assigned to the electrochemical processing device 12 and the end 68 is connected to the electrode holder 48 or the base 38.

[0086] In addition, electrolyte connections 70 are provided on the upper holder 58 (see Figure 3). These electrolyte connections 70 are each fluidly connected via a tubular workpiece to be machined, as shown, for example, in the figures, to the electrolyte connection 40 in the base assigned to the workpiece 14 in such a way that electrolyte can flow through the tubular workpiece 14 to be machined along one flow direction.

[0087] Alternatively, it is also conceivable that only a single electrolyte connection is provided on the base 38 and / or on the upper holder 58.

[0088] The area between workpiece 14 and base 38 is sealed by means of the lower support 42 or the fasteners 43 to prevent electrolyte from leaking out. Sealing is also provided between workpiece 14 and the upper support 58 or the fasteners 59.

[0089] In order to ensure that the transition between the electrodes 54 and the respective associated workpiece 14 is sealed, disc-like sealing covers 72 are also provided.

[0090] In the following, the operation of the electrochemical processing device 12 by means of the system 10 will be discussed.

[0091] For this purpose, the various possible drive concepts for adjusting the telescopic guides 26 are first discussed below.

[0092] According to a first option, the position of the two telescopic guides can be controlled by a common electric drive 74.

[0093] This common electric drive 74 is coupled to the telescopic guides 26, for example, by one or more gear stages 76 and shafts 78.

[0094] With this option, it is possible for the outer tubes 30 of the piston-cylinder unit 28 to be rotatably mounted on the base 38 by both telescopic guides 26 and to be rotated via the electric drive 74.

[0095] The rods 34 are twistedly connected to the electrode holder 48.

[0096] Depending on the position of the telescopic guides 26, the central tube 32 is either rotated together with the outer tubes 30 or is twisted by the rods 34. In order to realize such an adjustment, the ends of the rods 34 facing the central tubes 32 have external threads which engage in internal threads of the central tube 32.

[0097] The ends of the central tube 32 facing the outer tube in turn have external threads which engage with internal threads in the outer tubes 30.

[0098] If the telescopic guides 26 are in the maximum retracted state according to Figure 5 and are to be extended, the outer tubes 30 are rotated via the electric drive 74.

[0099] Because the rods 34 are connected to the electrode holder 48 in a twisted manner, they do not follow the rotational movement of the outer tubes 30. Thus, there is a differential speed between the outer tubes and the respective rods 34. The rotational movement of the outer tubes 30 also causes the center tube 32 to rotate, resulting in a relative rotational movement between the center tubes 32 and the respective rods 34.

[0100] Consequently, the rotating outer tubes begin to unscrew the rods 34 via the center tubes 32, causing them to move in vertical directions.

[0101] Once the maximum unscrewable length of the rods 34 is reached, a mechanical stop is provided between the rod 34 and the center tube 32. Once this stop is engaged, the center tube 32 is twistably coupled to the rod 34, so that from then on, a relative rotational speed occurs between the center tube 32 and the respective outer tube 30, and the center tubes 32 are unscrewed from the outer tubes 30 until the telescopic guides reach their maximum extended length as shown in Figures 3 and 4.

[0102] If the telescopic guides 26 are to be retracted from this state to their maximum retracted length, the telescopic guides 26 must be rotated in the opposite direction of rotation via the electric drive 74. This, in turn, results in the center tube 32 being screwed into the outer tube 30 and the rods 34 being screwed into the respective center tube 32. Alternatively, it is of course also conceivable for the telescopic guides 26 to each have their own electric drive 74. In this case, however, the electric drives would have to be operated synchronously with each other to ensure synchronous adjustment of the telescopic guides 26.

[0103] Alternatively, the electrical adjustment can also be carried out via a telescopic spindle, in which case it is conceivable that parts of the piston-cylinder unit 28 are provided with an additional housing or a cover.

[0104] According to a second option, a hydraulic adjustment of the telescopic guides 26 is also conceivable, whereby the piston-cylinder units 28 in this case are multi-stage cylinders and the electric drive 74 could be omitted. Furthermore, hydraulic connections on the piston-cylinder units 28 would be necessary to supply or discharge hydraulic fluid.

[0105] According to a third option, the piston-cylinder units 28 of the telescopic guides 26 can also be adjusted pneumatically. In this case, compressed air connections would be necessary to adjust the piston-cylinder unit 28.

[0106] If the electrochemical processing device 12 is to be operated by means of the system 10, as shown in Figures 1 and 2, it must first be installed in the system 10.

[0107] For this purpose, the electrochemical processing device 12 should be in an assembly position according to Figure 5 in order to simplify installation in the system 10.

[0108] The electrochemical processing device 12 is attached to the base 38 via the mechanical interface 44, which forms a non-destructive, detachable connection with the mechanical interface 24.

[0109] Furthermore, the electrolyte connections 40, 70 of the electrochemical processing device 12 are connected to the hydraulic electrolyte circuit 18 of the system 10 via the electrolyte connection 22. Furthermore, the drive 64 may need to be coupled to the upper bracket 58 to allow adjustment of the upper bracket 58.

[0110] If workpieces 14 are now to be machined, the piston-cylinder units 28 of the telescopic guides 26 can be extended depending on the size of the elongated workpieces 14.

[0111] The length L of the telescopic guide 26 should correspond to at least approximately twice the area of ​​the workpiece 14 to be machined.

[0112] In the next step, the upper holder 58 can be adjusted along the outer tube 30 via the drive 64 so that the workpieces 14 can be inserted into the lower holder 42 of the base 38 according to Figures 1 to 4.

[0113] The upper holder 58 can then be moved along the outer rollers 30 toward the base 38 by means of the drive 64. The distance between the upper holder 58 and the lower holder 42 is adjusted to the length of the workpieces 14.

[0114] As a result, the workpieces 14 are each fixed by the lower holder 42 and the upper holder 58.

[0115] If the workpieces 14 are to be machined, such as in this case the inside of the tubes 16, it must be ensured that the sealing covers 72 are inserted and the transition between the electrodes 54 and the respective workpieces 14 is sealed.

[0116] During the machining process, the electrodes 54 are moved along the area of ​​the workpieces 14 to be machined. This is again achieved by adjusting the telescopic guides 26, so that the electrode holder 48 moves relative to the base 38 and the upper holder 58.

[0117] Once machining is complete, the electrode holder 48 is moved upward via the telescopic guide 26. The upper holder 58 is then moved upward via the drive 64, so that the workpieces 14 can be removed from the lower holder 42.

[0118] If the electrochemical processing device 12 is to be removed from the system 10, the electrochemical processing device 12 can be reduced to the maximum retracted length, the electrolyte connections 40, 70 are separated from the electrolyte connection 22 of the system 10 and the mechanical interface 44 of the base 38 is removed from the interface 24 of the system 10.

Claims

Patent claims 1. Electrochemical machining device for machining elongated workpieces (14), with at least two synchronously movable, vertical telescopic guides (26), a base (38) which is arranged in the region of a lower end (36) of the telescopic guides (26) and has a lower holder (42) for at least one workpiece (14), as well as an upper holder (58) for the at least one workpiece (14), which is vertically adjustable in order to be able to adapt the distance between the holders (42, 58) to the length of the at least one workpiece (14), and an electrode holder (48) which is fastened to the telescopic guides (26) and can be moved by the telescopic guides (26) relative to the upper holder (58).

2. Electrochemical machining device according to claim 1, characterized in that the maximum extended length (L max) the telescopic guides (26) at least 1.5 times the maximum retracted length (L m in) of the telescopic guides (26).

3. Electrochemical machining device according to claim 1 or 2, characterized in that the telescopic guides (26) are formed by piston-cylinder units (28) which serve as a drive for the relative movement of the electrode holder (48) to the base (38).

4. Electrochemical machining device according to one of the preceding claims, characterized in that the telescopic guides (26) have an outer tube (30), at least one guided central tube (32) movable relative to the outer tube (30) and an end-side rod (34) guided on the central tube (32), wherein one of the group consisting of the outer tube (30) and the rod (34) is provided on the base (38) and the other of the group is provided on the electrode holder (48).

5. Electrochemical machining device according to claim 4, characterized in that the upper holder (58) is mounted on the telescopic guides (26) so as to be longitudinally displaceable.

6. Electrochemical machining device according to claim 5, characterized in that the outer tubes (30) are provided on the base (38) and the upper holder (58) is slidably guided on the outer tube (30).

7. Electrochemical machining device according to one of the preceding claims, characterized in that the base (38) has a mechanical interface (44) which serves for connection to a system (10) for operating the electrochemical machining device (12).

8. Electrochemical machining device according to one of the preceding claims, characterized in that the electrode holder (48) has fastenings (52) for a plurality of electrodes (54) and the upper and lower holders (42) have fastenings (59, 43) for a plurality of workpieces (14).

9. Electrochemical machining device according to one of the preceding claims, characterized in that the electrode holder (48) and / or the upper holder (58) each form a bridge (50, 60) between the telescopic guides (26).

10. Electrochemical machining device according to one of the preceding claims, characterized in that the upper holder (58) is movable towards and away from the base (38) by means of a drive (64) which is independent of a drive for the electrode holder (48).

11. Electrochemical machining device according to claim 10, characterized in that the drive (64) is coupled with its one end (66) to the upper holder (58) and is connected with its other end (68) to the base (38) or to the electrode holder (48) or to a housing structure (17).

12. Electrochemical machining device according to one of the preceding claims, characterized in that the one or more electrodes attached to the electrode holder (48) are cathodes (56).

13. Electrochemical machining device according to one of the preceding claims, characterized in that one or more electrolyte connections (40) are provided on the base (38), which are fluidically connected to the at least one lower holder (42) in such a way that electrolyte can be introduced into and / or discharged from a tubular workpiece (14) to be machined.

14. Electrochemical machining device according to claim 13, characterized in that one or more electrolyte connections (70) are provided on the upper holder (58), each of which is fluidically connected via a workpiece (14) to be machined to the one electrolyte connection (40) or the several electrolyte connections (40) of the at least one lower holder (42) in such a way that the electrolyte flows along the workpiece (14) to be machined.

15. Electrochemical machining device according to claim 13 or 14, characterized in that at least one sealing cover (72) is provided which seals the transition between the electrode (54) and the workpiece (14) or between the electrode (54) and the upper holder (58).

16. System with a hydraulic electrolyte circuit (18), a pump (20), an interface (24) for non-destructively fastening and detaching a base (38) of an electrochemical processing device (12) according to one of the preceding claims to the system and an electrolyte connection (22) for releasably coupling the hydraulic electrolyte circuit (18) to the electrochemical processing device (12) fastened in the system and a controller (25) which is designed to control the electrochemical processing device (12).

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