DE102017001359B4 - Method for fine machining a disk-shaped workpiece - Google Patents

Abstract

Method for fine machining a disk-shaped workpiece (1) on a machine tool, the workpiece (1) having an axis (a), the workpiece (1) having a central bore (2) with the axis (a), the workpiece (1 ) has at least two eccentric bores (3, 4, 5) eccentric to the axis (a) and wherein the workpiece (1) has a profiling (6) on an outer circumference, characterized in that the method comprises the steps of: a) feeding the workpiece (1) to a clamping means (7) of the machine tool, wherein the clamping means (7) has a central clamping mandrel (8) for clamping the central bore (2) and at least two eccentric clamping mandrels (9, 10, 11) for clamping the eccentric bores (3, 4, 5), the central clamping mandrel (8) and the at least two eccentric clamping mandrels (9, 10, 11) being arranged so as to be axially displaceable in the clamping device (7) b) positioning the at least two eccentric bores (3, 4, 5) on the at least two eccentric chip mandrels (9, 10, 11) and clamping the workpiece (1) via the eccentric bores (3, 4, 5) on the eccentric mandrels (9, 10, 11); c) finishing the central bore (2); Moving the central mandrel (8) into the central bore (2) and clamping the workpiece (1) via the central bore (2) on the central mandrel (8) e) releasing the tension of the eccentric mandrels (9, 10, 11) and axial Displacing the eccentric mandrels (9, 10, 11) out of the eccentric bores (3, 4, 5); f) clamping the workpiece (1) on the clamping means (7) by means of at least one retaining element (12, 13, 14); g) fine machining of the eccentric bores (3, 4, 5) h) fine machining of the profiling (6) i) release of the tension of the central mandrel (8) and removal of the finished machined workpiece (1) from the clamping device (7).

Description

The invention relates to a method for fine machining a disc-shaped workpiece on a machine tool, wherein the workpiece has an axis, wherein the workpiece has a central bore with the axis, wherein the workpiece has at least two eccentric eccentric to the axis eccentric holes and wherein the workpiece on an outer circumference Profiling. In particular, the invention relates to such a method in which two disc-shaped workpieces are processed in the package, wherein especially in aligned in the direction of the axis arrangement of the eccentric the profiles of the two workpieces are not aligned.

Workpieces of the type mentioned are needed, for example, in cycloidal transmissions and referred to here as Cycloid wheel. Such components have a toothing on their outer circumference; In addition, a central bore and eccentrically arranged holes in the substantially disc-shaped workpiece are arranged, which are required for the function.

Such disk-shaped workpieces for cycloid transmission disclosed, for example, the DE 32 06 992 C2 , Similar solutions show the DE 195 41 806 C1 , the DE 44 19 432 C2 and the DE 20 2011 001 560 U1 , An example of a machine tool on which said workpieces can be manufactured is disclosed by US Pat DE 20 2016 004 284 U1 ,

The problem is that for the positional accuracy of the individual functional surfaces (drilling and profiling) only very small tolerances in the range of a few micrometers are required, which makes the production of said parts difficult. Consequently, it is not possible to achieve the required tolerances for such components without special measures.

The invention has the object of providing a generic method in such a way that with good productivity very high precision machining can be ensured. This should already apply to the processing of individual workpieces, but in particular if such workpieces are machined as pairs which do not have aligned profiles on the outer circumference when the eccentric bores are aligned.

1. a) Zuführen des Werkstücks zu einem Spannmittel der Werkzeugmaschine, wobei das Spannmittel einen Zentralspanndom zum Spannen der Zentralbohrung und mindestens zwei Exzenter-Spanndorne zum Spannen der Exzenterbohrungen aufweist, wobei der Zentralspanndorn und die mindestens zwei Exzenter-Spanndorne axial verschieblich (in Richtung der genannten Achse) im Spannmittel angeordnet sind;
2. b) Positionieren der mindestens zwei Exzenterbohrungen auf den mindestens zwei Exzenter-Spanndornen und Spannen des Werkstücks über die Exzenterbohrungen auf den Exzenter-Spanndornen;
3. c) Feinbearbeiten der Zentralbohrung;
4. d) axiales Verschieben des Zentralspanndorns in die (feinbearbeitete) Zentralbohrung und Spannen des Werkstücks über die Zentralbohrung auf dem Zentralspanndorn;
5. e) Lösen der Spannung der Exzenter-Spanndorne und axiales Verschieben der Exzenter-Spanndorne aus den Exzenterbohrungen heraus;
6. f) Festspannen des Werkstücks auf dem Spannmittel mittels mindestens eines Halteelements;
7. g) Feinbearbeiten der Exzenterbohrungen;
8. h) Feinbearbeiten der Profilierung;
9. i) Lösen der Spannung des Zentralspanndorns und Entnahme des fertig feinbearbeiteten Werkstücks vom Spannmittel.

The solution to this problem by the invention provides for the production of a single workpiece, a method comprising the steps:

1. a) feeding the workpiece to a clamping means of the machine tool, wherein the clamping means comprises a central clamping dome for clamping the central bore and at least two eccentric mandrels for clamping the eccentric holes, wherein the central clamping mandrel and the at least two eccentric mandrels axially displaceable (in the direction of said axis ) are arranged in the clamping means;
2. b) positioning the at least two eccentric holes on the at least two eccentric mandrels and clamping the workpiece over the eccentric holes on the eccentric mandrels;
3. c) fine machining of the central bore;
4. d) axial displacement of the central mandrel in the (fine-machined) central bore and clamping of the workpiece via the central bore on the central mandrel;
5. e) releasing the tension of the eccentric mandrels and axially displacing the eccentric mandrels from the eccentric bores;
6. f) clamping the workpiece on the clamping means by means of at least one holding element;
7. g) fine machining of the eccentric holes;
8. h) finishing the profiling;
9. i) release the tension of the central mandrel and remove the finished finished workpiece from the clamping device.

1. a) Zuführen der Werkstücke zu einem Spannmittel der Werkzeugmaschine, wobei das Spannmittel einen Zentralspanndorn zum Spannen der Zentralbohrung und mindestens zwei Exzenter-Spanndorne zum Spannen der Exzenterbohrungen aufweist, wobei der Zentralspanndorn und die mindestens zwei Exzenter-Spanndorne axial verschieblich im Spannmittel angeordnet sind;
2. b) Positionieren der mindestens zwei Exzenterbohrungen beider Werkstücke auf den mindestens zwei Exzenter-Spanndornen und Spannen der Werkstücke über die Exzenterbohrungen auf den Exzenter-Spanndornen;
3. c) Feinbearbeiten der Zentralbohrungen der beiden Werkstücke;
4. d) axiales Verschieben des Zentralspanndorns in die (feinbearbeiteten) Zentralbohrungen der beiden Werkstücke und Spannen der Werkstücke über die Zentralbohrungen auf dem Zentralspanndorn;
5. e) Lösen der Spannung der Exzenter-Spanndorne und axiales Verschieben der Exzenter-Spanndorne aus den Exzenterbohrungen heraus;
6. f) Festspannen der Werkstücke auf dem Spannmittel mittels mindestens eines Halteelements;
7. g) Feinbearbeiten der Exzenterbohrungen beider Werkstücke;
8. h) Lösen des mindestens einen Halteelements;
9. i) Reduzierung oder Lösung der Spannung des Zentralspanndorns;
10. j) Verdrehung des einen Werkstücks um die Achse relativ zum anderen Werkstück, so dass die Profilierungen der beiden Werkstücke fluchten;
11. k) Erhöhung der Spannung des Zentralspanndorns;
12. l) Feinbearbeiten der beiden Profilierungen;
13. m) Lösen des Zentralspanndorns und Entnahme der fertig feinbearbeiteten Werkstücke vom Spannmittel.

In the case of preferred machining of a pair of two workpieces, the proposed method provides the steps:

1. a) feeding the workpieces to a clamping means of the machine tool, wherein the clamping means comprises a central clamping mandrel for clamping the central bore and at least two eccentric mandrels for clamping the eccentric holes, wherein the central clamping mandrel and the at least two eccentric mandrels are arranged axially displaceable in the clamping means;
2. b) positioning the at least two eccentric holes of both workpieces on the at least two eccentric mandrels and clamping the workpieces on the eccentric bores on the eccentric mandrels;
3. c) finishing the central bores of the two workpieces;
4. d) axial displacement of the central mandrel in the (finely machined) central holes of the two workpieces and clamping the Workpieces via the central bores on the central mandrel;
5. e) releasing the tension of the eccentric mandrels and axially displacing the eccentric mandrels from the eccentric bores;
6. f) clamping the workpieces on the clamping means by means of at least one retaining element;
7. g) finishing the eccentric holes of both workpieces;
8. h) releasing the at least one retaining element;
9. i) reduction or release of the tension of the central mandrel;
10. j) rotation of the one workpiece about the axis relative to the other workpiece, so that the profilings of the two workpieces are aligned;
11. k) increasing the tension of the central mandrel;
12. l) fine machining of the two profilings;
13. m) Release the central clamping mandrel and remove the finished, finished workpieces from the clamping device.

In the latter case, the machining of two workpieces as a pair is preferably provided that the clamping of the workpieces on the central mandrel and on the eccentric mandrels takes place by separate axial sections of the central mandrel and separate axial sections of the eccentric mandrels are tensioned. Accordingly, said mandrels have along their axis axially offset different separate clamping sections which can be activated independently.

In all cases, it is preferably provided that the tensioning of the central clamping mandrel and the clamping of the eccentric mandrels are carried out by introducing pressurized oil (that is, an insert of "hydraulic expansion mandrels" is provided).

The fine machining of the central bore according to the above step c) can generally be done by hard turning, by grinding, by rubbing or by honing.

The fine machining of the eccentric bores according to the above step g) can equally be done generally by hard turning, by grinding, by rubbing or by honing.

The above-mentioned fine machining of the profiling is preferably carried out by Wälzschleifen; In this case, working in particular with a grinding worm.

In order to enable a precise machining of the profiling, it is preferably conceived to clamp the workpiece or the workpieces by means of a bell-shaped holding element on the clamping means.

The method is particularly advantageous for workpieces in the form of cycloidal disks of a cycloid gear into consideration.

The proposed approach makes it possible to work with good productivity workpieces of the type mentioned with very high precision.

The machining process can be accompanied by measures as they are known per se. In particular, the implementation of measuring processes after the implementation of individual process steps is provided. This applies both to the measurement of the machined holes and the processed profiling.

The individual method steps mentioned are preferably carried out in the time sequence as stated above. However, variants are also possible here. It is particularly possible to perform the machining of the central bore on one side and the machining of the eccentric holes on the other side in reverse order. In that regard, the above sequence of the individual process steps is not necessarily provided and understood in this chronological order.

In this alternative case, therefore, initially an axial displacement of the central mandrel into the (not yet finished) central bore of the workpiece and a clamping of the workpiece on the central mandrel would take place. After clamping the workpiece on the clamping means by means of the holding elements, the fine machining of the eccentric holes would take place. Then the eccentric mandrels would be retracted and tensioned in the eccentric holes. After relaxation and retraction of the central mandrel from the central bore fine machining of the central bore would take place.

• 1 in perspektivischer Darstellung zwei Werkstücke in Form von Zykloidenrädern eines Zykloidengetriebes, wobei die beiden Werkstücke im dargestellten Paket bearbeitet werden,
• 2 in perspektivischer Darstellung ein Spannmittel einer (nicht dargestellten) Werkzeugmaschine, wobei das Einlegen der Werkstücke in das Spannmittel angedeutet ist, d. h. es ist ein erstes Verfahrensstadium dargestellt,
• 3 in perspektivischer Darstellung das geschnitten dargestellte Spannmittel, wobei die beiden Werkstücke nunmehr im Spannmittel aufgenommen sind und über drei Exzenter-Spanndorne an ihren drei Exzenterbohrungen gespannt sind, d. h. es ist ein zweites Verfahrensstadium dargestellt,
• 4 in perspektivischer Darstellung das geschnitten dargestellte Spannmittel, wobei die beiden Werkstücke nunmehr bei noch eingefahrenen Exzenter-Spanndornen über einen Zentralspanndorn an ihrer Zentralbohrung gespannt sind, d. h. es ist ein drittes Verfahrensstadium dargestellt,
• 5 in perspektivischer Darstellung das geschnitten dargestellte Spannmittel, wobei die beiden Werkstücke nunmehr über den Zentralspanndorn an ihrer Zentralbohrung gespannt sind, d. h. es ist ein viertes Verfahrensstadium dargestellt,
• 6 in perspektivischer Darstellung das Spannmittel, wobei bei eingefahrenem Zentralspanndorn die beiden Werkstücke durch Halteelemente auf dem Spannmittel fixiert sind, d. h. es ist ein fünftes Verfahrensstadium dargestellt,
• 7 in perspektivischer Darstellung das Spannmittel, wobei nunmehr durch ein Verdrehelement das obere Werkstück relativ zum unteren Werkstück um die Achse verdreht wird, d. h. es ist ein sechstes Verfahrensstadium dargestellt,
• 8 in perspektivischer Darstellung das Spannmittel, wobei nunmehr durch ein glockenförmiges Halteelement die beiden Werkstücke gehalten werden, um die Profilierung feinzubearbeiten, d. h. es ist ein siebtes Verfahrensstadium dargestellt.

In the drawings, an embodiment of the invention is shown. Show it:

• 1 in perspective view two workpieces in the form of cycloid wheels of a cycloid gear, wherein the two workpieces are processed in the illustrated package,
• 2 in perspective view a clamping means of a (not shown) machine tool, wherein the insertion of the workpieces in the clamping means is indicated, that is, it is shown a first stage of the process,
• 3 in perspective view, the clamping means shown cut, the two workpieces are now included in the clamping means and are stretched over three eccentric mandrels at their three eccentric holes, ie it is shown a second stage of the process,
• 4 in a perspective view of the clamping means shown cut, the two workpieces are now stretched at a retracted eccentric mandrels on a central mandrel at its central bore, ie it is shown a third stage of the process,
• 5 in a perspective view the clamping means shown cut, wherein the two workpieces are now stretched over the central mandrel at its central bore, ie it is a fourth stage of the process shown,
• 6 in a perspective view of the clamping means, wherein with retracted central clamping mandrel, the two workpieces are fixed by holding elements on the clamping means, ie, it is shown a fifth stage of the method,
• 7 in a perspective view of the clamping means, wherein now the upper workpiece is rotated about the axis relative to the lower workpiece by a rotating element, ie it is shown a sixth stage of the method,
• 8th in a perspective view of the clamping means, now being held by a bell-shaped holding element, the two workpieces to finish the profiling, ie, it is a seventh stage of the process shown.

In 1 are two workpieces 1 shown, the disc-shaped cycloidal wheels of a cycloid gear are. The workpieces 1 have a central hole 2 on, through which the axis a of the workpiece runs. Eccentric to the axis a are three eccentric holes 3 . 4 and 5 arranged. In addition - which is of no greater relevance to the present invention - the workpiece still has three non-circular recesses, are imaged via the assembly functions of the transmission system. Furthermore, the two workpieces 1 in each case a profiling on its cylindrical outer circumference 6 in the form of a tooth system. If the two workpieces 1 with regard to their eccentric bores 3 . 4 and 5 This does not apply to the profiling 6 ; like out 1 it can be seen, is the profiling 6 the two teeth in the circumferential direction by half a tooth, ie offset by half a pitch.

It is the central hole 2 , the eccentric holes 3 . 4 and 5 as well as the profiling 6 Precise machining, with very high demands are placed on the precision. The permissible positional deviation of said bores or profilings is in the range of a few micrometers.

How this manufacturing task is solved economically and with a good result in terms of precision requirements, results from the 2 to 8th ,

In 2 you can see how the two workpieces 1 in the package arranged a (not shown) machine tool and in particular a clamping means 7 be supplied. The clamping device 7 has a central mandrel 8th and three eccentric mandrels 9 . 10 and 11 on. All mandrels 8th . 9 . 10 . 11 are in the direction of the axis a displaceable in the clamping device 7 arranged. As it turned out 2 results, is the central mandrel 8th in a retracted position while the three eccentric mandrels 9 . 10 and 11 in an extended position. In this position, the mandrels are the two workpieces 1 in the clamping device 7 used, ie the two workpieces 1 be with their eccentric holes 3 . 4 . 5 on the three eccentric mandrels 9 . 10 and 11 postponed.

Using the example of the eccentric mandrel 9 can be seen by the attached reference numerals (the same applies to the eccentric mandrels 10 and 11 ) that have separate axial sections 9 ' and 9 " the eccentric mandrels 9 . 10 and 11 present, with which specifically the respective eccentric bores 3 . 4 . 5 of the two workpieces 1 can be stretched.

The situation in which the workpieces 1 by means of the three eccentric mandrels 9 . 10 and 11 on the clamping device 7 are curious, is in 3 illustrated. Thus results from 3 that the workpieces 1 the clamping device 7 the machine tool were supplied. The three eccentric holes 3 . 4 and 5 both workpieces 1 were on the three eccentric mandrels 9 . 10 . 11 placed and there was a clamping of the workpieces 1 about the eccentric holes 3 . 4 . 5 on the eccentric mandrels 9 . 10 . 11 ,

The two workpieces 1 are now now based on the eccentric holes 3 . 4 . 5 on the clamping device 7 aligned. Now the two central holes 2 of the two workpieces 1 precision machined. This is done, for example, by grinding; Hartdrehen has also proven itself.

After fine machining of the central holes 2 will, as it is in 4 is shown, the central mandrel 8th into the central holes 2 of the two workpieces 1 by axial displacement in the direction of the axis a retracted. Then the central mandrel becomes 8th with its two axial clamping sections 8th' and 8th" excited, so that the two workpieces 1 based on the central mandrel 8th on the clamping device 7 are fixed.

The three eccentric mandrels 9 . 10 . 11 can now be relaxed and withdrawn in the axial direction, as it is 5 shows.

So for the subsequent processing, the two workpieces 1 on the clamping device 7 are fixed, now takes place the clamping of the workpieces 1 on the clamping device 7 by means of three retaining elements 12 . 13 and 14 , This is in 6 illustrated. The two workpieces 1 are now now based on the central bore 2 precisely adjusted and by the retaining elements 12 . 13 and 14 on the clamping device 7 fixed. In this state, the fine machining of the eccentric holes takes place 3 . 4 and 5 of the two workpieces 1 ,

After performing this operation are thus both the central bore 2 as well as the three eccentric holes 3 . 4 . 5 both workpieces 1 precisely edited. Now the editing of the profiling closes 6 at.

As with aligned alignment of the eccentric holes 3 . 4 . 5 the profiles 6 of the two workpieces 1 Do not swear (see above), now, as it is in 7 is shown with a twisting element 16 the upper workpiece 1 relative to the lower workpiece 1 around the axis a twisted at such an angle that the profilings 6 now aligned in the axial direction. In 7 are two angle marks 17 and 18 entered the required angle of rotation of the upper workpiece 1 relative to the lower workpiece 1 illustrate.

Before said relative rotation of the two workpieces 1 were of course the retaining elements 12 . 13 and 14 solved again and in their in 7 retracted shown starting position. Incidentally, the clamping pressure in the central mandrel was also 8th taken back, so that the rotation is possible.

Is the aligned positioning of the profiles 6 reached, the clamping pressure in the central mandrel is increased again and in preparation for the upcoming fine machining of the two profilings 6 of the workpiece 1 a bell-shaped holding element 15 on the workpieces 1 fitted to an axially biased mounting of the two workpieces 1 on the clamping device 7 to accomplish. This is in 8th shown. Now takes place - preferably by generating grinding by means of a (not shown) worm grinding the fine machining of the profiles 6 ,

Finally, the retaining element 15 removed and the central mandrel 8th relaxed, allowing the removal of the two finished fine machined workpieces 1 from the clamping device 7 can be done.

The explained procedure can be supplemented by a number of different additional steps or additional elements, but also modified:

To facilitate the setup, the clamping device 7 an alignment groove on its outer circumference 19 exhibit. The rotational position of the alignment groove 19 to the three eccentric mandrels 9 . 10 . 11 has been measured and on the clamping device 7 either engraved or stored by means of an RFID element, a QR code or a functionally comparable data carrier. By once aligning the alignment groove 19 By means of a probe is then the rotational position of the clamping device 7 to the axis a known.

To check the alignment can be on the clamping device 7 another surface should be attached at right angles to the alignment groove 19 is arranged. This surface can be traversed after alignment by means of a dial gauge.

When feeding the workpieces 1 on the clamping device 7 the two parts must have a positional relationship to each other. The package consisting of the two workpieces 1 is therefore advantageous with respect to the eccentric holes 3 . 4 . 5 pre-aligned. Accordingly, the workpieces 1 relative to the clamping device 7 so prepositioned that the eccentric holes 3 . 4 . 5 over the eccentric mandrels 9 . 10 . 11 stand.

As explained above, it makes sense that the mandrels - this applies to both the central mandrel 8th as well as for the eccentric mandrels 9 . 10 . 11 - Have axially offset clamping sections with which the corresponding holes of the workpieces can be clamped separately and independently. When clamping the workpieces, the lower level, ie the lower workpiece, is preferred 1 , and then the upper level, so the upper workpiece 1 , curious; excited.

For clamping the workpieces 1 the axial force is usually sufficient, which acts on the weight of the workpieces. Alternatively, when clamping the workpieces on the clamping device 7 a tailstock pressure bell used for axial pressing to a clearly defined system of workpieces on the clamping device 7 sure.

The three retaining elements 12 . 13 and 14 have proven themselves in this embodiment, to ensure a good support of the workpieces on the clamping device and yet to achieve a minimum surface pressure. In the embodiment, the holding elements engage radially from the outside to the workpieces (see 6 ). Alternatively to this solution can also be provided that the holding elements by corresponding recesses (see the non-circular recesses in the workpiece 1 ) in the workpieces 1 be guided. For clamping, they then pivot radially outward.

The relaxing and axial countersinking of the three eccentric mandrels 9 . 10 . 11 preferably takes place only after the said holding elements 12 . 13 . 14 already initiated an axial clamping force.

A temporally combined machining of the central bore 8th and the eccentric holes 9 . 10 . 11 is possible if through the retaining elements 12 . 13 . 14 a reliable hold of the workpieces 1 on the clamping device 7 is ensured.

With regard to the relative rotation of the two workpieces 1 by half a division of the profiling 6 to this on the outer circumference of the workpieces 1 To be aligned, it is preferable to proceed by means of said rotating element 16 in the eccentric holes of the upper workpiece 1 intervenes and this is thus prevented from rotation. The twisting element 16 is preferably axially biased by a pressure bell after previously both segments of the hydraulic expansion mandrel were loaded. The lower workpiece 1 is then by rotation of the rotary table, which the clamping means 7 holds, accordingly twisted.

For measuring the finely machined surfaces corresponding measuring devices can be provided, which are known as such.

In connection with the removal of the finished workpieces from the machine tool, it may be necessary for structural reasons or due to otherwise given collisions, to reverse the aforementioned rotation of the two workpieces before the workpieces are removed.

LIST OF REFERENCE NUMBERS

1

workpiece

2

central bore

3

eccentric hole

4

eccentric hole

5

eccentric hole

6

profiling

7

clamping means

8th

Central mandrel

8th'

axial section of the central mandrel

8th"

axial section of the central mandrel

9

Eccentric mandrel

9 '

axial portion of the eccentric mandrel

9 "

axial portion of the eccentric mandrel

10

Eccentric mandrel

11

Eccentric mandrel

12

retaining element

13

retaining element

14

retaining element

15

bell-shaped holding element

16

twist element

17

angle mark

18

angle mark

19

alignment groove

a

axis

Claims (10)

Method for fine machining a disk-shaped workpiece (1) on a machine tool, the workpiece (1) having an axis (a), the workpiece (1) having a central bore (2) with the axis (a), the workpiece (1 ) has at least two eccentric bores (3, 4, 5) lying eccentrically to the axis (a) and wherein the workpiece (1) has a profiling (6) on an outer circumference, characterized in that the method comprises the steps of: a) feeding the Workpiece (1) to a clamping means (7) of the machine tool, wherein the clamping means (7) has a central clamping mandrel (8) for clamping the central bore (2) and at least two eccentric clamping mandrels (9, 10, 11) for clamping the eccentric bores (3 , 4, 5), wherein the central mandrel (8) and the at least two eccentric mandrels (9, 10, 11) are arranged axially displaceable in the clamping means (7); b) positioning the at least two eccentric bores (3, 4, 5) on the at least two eccentric mandrels (9, 10, 11) and clamping the workpiece (1) via the eccentric bores (3, 4, 5) on the eccentric mandrels (9, 10, 11); c) finishing the central bore (2); d) axially displacing the central clamping mandrel (8) into the central bore (2) and clamping the workpiece (1) via the central bore (2) on the central clamping mandrel (8); e) releasing the tension of the eccentric mandrels (9, 10, 11) and axially displacing the eccentric mandrels (9, 10, 11) out of the eccentric bores (3, 4, 5); f) clamping the workpiece (1) on the clamping means (7) by means of at least one holding element (12, 13, 14); g) fine machining of the eccentric bores (3, 4, 5); h) finishing the profiling (6); i) releasing the tension of the central mandrel (8) and removing the finished fine machined workpiece (1) from the clamping means (7). A method of finishing two disc-shaped workpieces (1) in a package on a machine tool, the workpieces (1) having an axis (a), the workpieces (1) having a central bore (2) with the axis (a), the workpieces (1) have at least two eccentric bores (3, 4, 5) which are eccentric to the axis (a) and wherein the workpieces (1) have a profiling (6) on an outer circumference, the arrangement being aligned in the direction of the axis (a) Eccentric bores (3, 4, 5) the profiles (6) of the two workpieces (1) are not aligned, characterized in that the method comprises the steps of: a) feeding the workpieces (1) to a clamping means (7) of the machine tool, wherein the clamping means (7) has a central clamping mandrel (8) for clamping the central bore (2) and at least two eccentric clamping mandrels (9, 10, 11) for clamping the eccentric bores (3, 4, 5), wherein the central clamping mandrel (8) and the at least two eccentric S panndorne (9, 10, 11) axially displaceable in the clamping means (7) are arranged; b) positioning the at least two eccentric bores (3, 4, 5) of both workpieces (1) on the at least two eccentric clamping mandrels (9, 10, 11) and clamping the workpieces (1) via the eccentric bores (3, 4, 5) on the eccentric mandrels (9, 10, 11); c) finishing the central bores (2) of the two workpieces (1); d) axially displacing the central clamping mandrel (8) into the central bores (2) of the two workpieces (1) and clamping the workpieces (1) via the central bores (2) on the central clamping mandrel (8); e) releasing the tension of the eccentric mandrels (9, 10, 11) and axially displacing the eccentric mandrels (9, 10, 11) out of the eccentric bores (3, 4, 5); f) clamping the workpieces (1) on the clamping means (7) by means of at least one holding element (12, 13, 14); g) fine machining of the eccentric bores (3, 4, 5) of both workpieces (1); h) releasing the at least one retaining element (12, 13, 14); i) reduction or release of the tension of the central mandrel (8); j) rotation of the one workpiece (1) about the axis (a) relative to the other workpiece (1), so that the profilings (6) of the two workpieces (1) are aligned; k) increasing the tension of the central mandrel (8); 1) fine machining of the two profilings (6); m) releasing the central mandrel (8) and removing the finished fine machined workpieces (1) from the clamping means (7). Method according to Claim 2 , characterized in that the clamping of the workpieces (1) on the central mandrel (8) and on the eccentric mandrels (9, 10, 11) by separate axial sections (8 ', 8 ") of the central mandrel (8) and separate axial sections (9 ', 9 ") of the eccentric mandrels (9, 10, 11) are tensioned. Method according to one of Claims 1 to 3 , characterized in that the clamping of the central mandrel (8) and the clamping of the eccentric mandrels (9, 10, 11) by introducing pressurized oil. Method according to one of Claims 1 to 4 , characterized in that the finishing of the central bore (2) according to step c) of Claim 1 or 2 by hard turning, by grinding, by rubbing or by honing. Method according to one of Claims 1 to 5 , characterized in that the fine machining of the eccentric bores (3, 4, 5) according to step g) of Claim 1 or 2 by hard turning, by grinding, by rubbing or by honing. Method according to one of Claims 1 to 6 , characterized in that the fine machining of the profiling (6) according to step h) of Claim 1 or according to step 1) of Claim 2 done by Wälzschleifen. Method according to Claim 7 , characterized in that the Wälzschleifen takes place by means of a grinding worm. Method according to one of Claims 1 to 8th , characterized in that before the fine machining of the profiling (6) according to step h) of Claim 1 or before the fine machining of the profilings (6) according to step 1) of Claim 2 the workpiece or the workpieces by means of a bell-shaped holding element (15) on the clamping means (7) are tensioned. Method according to one of Claims 1 to 9 , characterized in that the workpiece (1) is a cycloidal disk of a cycloid gear.

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