WO2014082974A1 - Device for positioning a tubular workpiece, in particular an injection nozzle - Google Patents

Abstract

The invention relates to a device for positioning a tubular workpiece, in particular an injection nozzle, on a retainer of a machine tool, said machine tool having a workpiece receptacle, which can be fastened to the retainer and which retains the tubular workpiece (10) with the tubular workpiece sitting on an accommodating pin (50). According to the invention, the workpiece receptacle has a two-part design, comprising a lower part (20) that can be fastened to the retainer and an upper part (40) that can be attached to the lower part (20), and comprising a first apparatus for adjusting the height of the tubular workpiece (10), and comprising a second apparatus for adjusting the rotation of the workpiece.

Description

Device for positioning a tubular workpiece, in particular an injection nozzle

The invention relates to a device for positioning egg nes tubular workpiece, in particular a Einspritzdü ^¬ se, to a holder of a machine tool. The Werkzeugma ^¬ machine has for this purpose a workpiece holder on or on which the holder can be fastened. The tubular workpiece is held seated on a mandrel there.

Apparatus for positioning workpieces are well known. For example, DE 10 2006 054 660 B4 describes such a device, in which the holder is provided with receptacles for centering elements, which are to be fixedly connected to the tool or workpiece. The centering elements are on

Tool or tool piece used as separate parts and then held by holding means, for example. Adhesive, aligned ^¬ tet fixed. This known device is suitable for ^¬ game to accurately position electrodes on eroding machines.

A particular challenge in the positioning of tubular workpieces are injection nozzles for automotive engineering. Such injection nozzles require that a number of holes be made at their tips, which must be placed very precisely during production. For this it is necessary to provide in accordance with exact directions Positioniervor ^¬ ready nen to bring the holes in the injector at the exact right places to kön-.

This is where the present invention begins. The invention has the object to provide a device for positioning tubular workpieces, in particular injectors, this allows to process the tubular workpiece very ex ^¬ act, for example on corresponding erosion machines. It should be possible, the aufzufindende device zen aufzuset exactly on the already described holders of the machine tool.

This object is achieved by a device having the features of claim 1.

Further developments of this device are specified in the subclaims. The device according to the invention is essentially based on the fact that the workpiece holder is formed in two parts with a lower part which can be fastened on a holder and an upper part which can be placed on the lower part. In addition, a first device for height is uttierung of the tubular workpiece and a second means for concentricity ustage of the workpiece is provided.

In a further development of the invention, a third device is provided for XY alignment of the upper part on the lower part. For this purpose, the third submission has, for example, one or more reference surfaces provided on the upper part, which can be brought into alignment with corresponding reference points of the reference surfaces on the lower part. Another development provides that a fourth device is provided for adjusting the coaxiality from the upper part to the lower part. Conveniently, the tubular workpiece to be machined ^¬ piece, in particular the injection nozzle is clamped on a mandrel sitting in the upper part of the positioning. The use of a holding mandrel has the decisive advantage that not the tubular work piece itself must be hö ^¬ henjustiert, but only the receiving mandrel on which then rests the workpiece. The clamping of the tubular workpiece on the mandrel is preferably carried out via a suitable clamping sleeve, the locking elements, insbesondre comprises a plurality of detent balls.

For height adjustment, the first device preferably has an eccentric element on which a lower end of the receptacle ^¬ medorn is seated. This allows a Höhenverstel ^¬ development of the arbor made on the basis of Exzentität the eccentric ^¬ wave upon rotation of Exzentere- lements that. An eccentric shaft is, for example,.

For this purpose, the eccentric shaft can have a central eccentric section and one, preferably two, outer cylindrical ^sections . In this case, the cylindrical sections have an enlarged diameter, so that at least one stop edge is formed between the middle section and the at least one outer cylindrical section. This stop edge prevents slippage of the eccentric shaft in a corresponding radial bore of the upper part, if there is provided a corresponding counter-stop. In addition, a groove may be provided in the eccentric region of the eccentric shaft.

It has proven to be expedient to provide the cylindrical section of such an eccentric shaft with a sliding coating, so that it is in the mentioned radial bore of the top runs backlash. A rotation of the eccentric ^¬ wave is achieved in that preferably at both

End faces of the eccentric shaft two receiving bores, in particular key receptacles for a. Six or multi-key are provided.

A further embodiment of the device according to the invention for positioning tubular pieces of value provides that the upper part has a round flange and this round flange engages over the lower part at least partially, preferably in a circumference of 360 °. As a result, the fourth device for adjusting the coaxiality of upper part to lower part can be realized simply by providing a plurality of adjusting screws, which are inserted into radial bores of the mentioned round flange of the upper part and are supported on a circumferential conversion of the lower part. By a different deep screwing in these screws so very exactly a coaxiality can be used.

The upper part may have an annular wall lying orthogonally to the longitudinal axis, which has a multiplicity of axial bores located to the longitudinal axis. These axial bores are provided for receiving further adjusting screws, which can be supported on the surface of the lower part and thus enable a rotation running ustage.

The upper part of the device preferably has a cup-shaped receiving part for receiving the tubular workpiece, wherein the receiving mandrel protrudes from the receiving part. On the soil of the receiving part sit expediently one or more ^¬ re fixing elements, such as a locking pin. This fixing ^¬ element serve that the tubular workpiece, if it has corresponding Gegenfixierelemente, so for example a bore into which an intended fixing pin engages, is received in the correct position and correctly with respect to the radial position of the upper part. Another embodiment provides that the lower part is provided with centering elements from its side directed toward the tool ^holder . These may, for example, be such centering elements as proposed in the aforementioned DE 10 2006 054 660 B4. For an optimal alignment of the lower part on the corresponding holder and thus the tool holder of the machine tool is ensured.

Although it was mentioned above that the upper and the lower part of the device for positioning the workpiece are formed in two parts, it is within the scope of

Invention, that the upper part and the lower part are also designed in one piece. However, the above-mentioned X-Y assembly for aligning the upper part on the lower part is no longer necessary in such a solution.

The invention will be explained in more detail below in connection with a specific embodiment with reference to several figures. In the drawings: Fig 1 is a perspective view obliquely from above of a fuel injector to be machined with high ^¬ introduced precise holes.

2 shows the injection nozzle of Figure 1 in a perspective view position obliquely from below,

Fig. 3 shows a device for positioning an injection nozzle with a workpiece holder, designed in two parts is with a top and bottom part in perspektivi ^¬ shear representation, the upper part is shown from the lower part ^¬ set,

4 is a view similar to Figure 2, but now with a view from diagonally below the arrangement,

Fig. 5 shows the illustration of Figure 3, in contrast to

 FIG. 3, the upper part is now seated on the lower part,

6 is a view similar to Figure 5, but now in partial section, the injector is removed from the upper ^¬ part,

Fig. 7 is a detail view of the eccentric shaft shown cut in Figure 6, and

Fig. 8 is a similar view as in Figure 7, in which, however, now the injector is seated on the mandrel and thus in the upper part of the device is a ^¬ set.

In the following figures, unless otherwise indicated, like reference numerals designate like parts with the same meaning.

In Figure 1, an injection nozzle 10 is shown in a perspective view obliquely from above, as used for example in automotive electronics. In such injectors is tubular workpieces, in which at the upper end a plurality of bores 11 with high precision are introduced Müs ^¬ sen. So that these bores 11 can be placed in the desired accuracy and introduced into the injection nozzle 10. NEN, it is necessary to place the injection nozzle 10 both in terms of their concentricity and their height adjustment correctly on a corresponding workpiece holder in order to subsequently produce, for example, by suitable erosion the holes 11 can.

Figure 2 shows the injector of Figure 1, also in spectral tivi shear per ^¬ view, but now diagonal. On the annular bottom of the injection nozzle 10 Fixierbohrungen 12 may be provided to position the injector 10 in the correct position on a suitable workpiece holder in the XY direction.

In the following FIGS. 3 to 6 and FIG. 8, a workpiece receptacle suitable for this purpose is shown in different views in each case.

FIG. 3 shows such a workpiece holder, which is formed in two parts, with a lower part 20 which can be mounted on a holder of a machine tool and an upper part 40 which can be placed on the lower part 20. In addition, this workpiece holder also has a first device for adjusting the height of the device to be explained in more detail below tubular workpiece 10, in this case the injection nozzle 10, and a second device for its concentricity adjustment on. In addition, a third device may be provided for XY alignment of the upper part 40 to the lower part 20 and a fourth means for adjusting the coaxiality of upper part 40 to lower part 20. The lower part 20 is cup-shaped and has on its upper part 40 facing, at least approximately fla ^¬ chen top over four at an angle of 90 ° to each other standing holes 28, in which fastening screws 51 engage, which is 40 extend parallel to the starting Längsach se ^¬ A through the upper part 40 by a coaxially to the longitudinal axis A is arranged ^¬ annular surface 52 of the upper part. In the cup-shaped opening of the lower part 20 sit several, in the present case four, centering elements 21, 22, 23 and 24, and a centering pin 26, which can be seen particularly clearly in Figure 4. With these centering elements 21 to 24 and the associated centering pin 26, the lower part 20 can be placed with the later attached upper part 40 on a holder of a machine tool, as described in detail in DE 10 2006 054 660 B4.

The upper part 40 has two opposite, flattened reference surfaces 41, 42, which serve to be able to align the upper part 40 exactly in the X-Y direction to the lower part 20.

As best seen in the sectional view of Figure 6 and Figure 8, is located in the interior of the upper part 40 of the workpiece holder a receiving mandrel 50, on which the injection ^¬ nozzle 10 can be placed in order to process the injector 10 last ^¬ lich. This receiving mandrel 50 is seated with its lower end on an eccentric element 60 and projects with its upper end of the upper part 40 clearly out. This eccentric element 60 is shown in the sectional view of Figure 6 and enlarged as a single element in Figure 7 in per ^¬ spectrally enlarged representation. The Exzenterele ^¬ element 60 is designed as an eccentric shaft and has two central, eccentric portions 61, 62 which are separated by a groove 69, a so-called flushing groove. To the two eccentric portions 61, 62 each includes a cylindri ^¬ shear section 63, 64 at. On the two end faces of the eccentric shaft 60 are each bores 67, 68, the da- to serve, for example, a multiple key (hex wrench ^¬ key) set here to turn the eccentric shaft can. The eccentric shaft 60 sits for this purpose in a continuous Ra ^¬ dialbohrung 46 of the upper part 40 such that the receiving mandrel 50 is seated on the two eccentric portions 61, 62 of the eccentric shaft 60. By rotating the eccentric shaft 60, due to the eccentricity at the eccentric sections 61, 62, the receiving mandrel 50 can be moved back and forth in its height. A seated on the mandrel 50 injector 10 is therefore adjustable in height so far. For this purpose, only with a suitable tool, for example egg ^¬ nem hexagon key, which is inserted into the radial bore 46 and engages in the receiving opening 67 of the eccentric shaft 60, rotated accordingly. In order to avoid unintentional rotation of the eccentric shaft 60, there are each limiter screws 81, 82 on the left and right end faces of the eccentric shaft 60.

In order to fix the receiving mandrel 50 in the upper part 40 when height adjustment has taken place, a multiplicity of further radial bores 47 are incorporated into the upper section of the upper part 40. In the present embodiment, a total of two superimposed rows of four, each at an angle of 90 ° to each other, radial bores 47 are provided. In each of these radial bores 47 locking screws 75 sit, through which the receiving mandrel 50 can be clamped. The upper part 40 has a round flange 45, which engages over the Un ^¬ terteil 20 at least partially full extent. In this round flange 45 are at a distance of 90 ° to each other holes that receive adjusting screws 90. By Corresponding rotation of these adjusting screws 90, the coaxiality of the upper part 40 to the lower part 20 set who ^¬ the. The adjusting screws 90 sit for this purpose in holes, which are provided with the reference numeral 58.

The upper part 40 has the above-mentioned ring ^¬ wall 43, which are placed parallel to the longitudinal axis A running Bohrun ^¬ conditions for receiving the fixing screws 51. In addition, other starting AXI are of this annular wall 43 albohrungen 48 is provided, in which adjusting screws are inserted in turn, that of the sub ^¬ 20 can be supported on the flat wall portion. By adjusting the adjustment screws located in the axial bores 48, an adjustment for the concentricity can be made. One of these located in the axial bores 48 adjustment screws is provided with the reference numeral 53 and in the partially broken section of Figure 5 can be seen.

As can be seen from FIGS. 1 to 6 and 8, the pot-shaped receiving part 49 of the upper part 40 surrounds a clamping sleeve

70. This clamping sleeve 70 surrounds the upper cup-shaped receptacle ^¬ part 49 of the upper part 40 and sits on coil springs 72. In a circumferential, inner groove of the clamping sleeve 70 a plurality of locking elements, here locking balls 71, placed, which can engage in openings of the cup-shaped receiving part 49 of the upper part 40 when the clamping sleeve 7 can engage.

As shown particularly clearly in FIG. 8, these detent balls 71 serve to effect latching when the injection nozzle 10 is inserted, that is to say in the case of an injection nozzle 10 which is placed on the upper end of the receiving mandrel 50. For this purpose, to ^¬ nearest the clamping sleeve 70 is pressed against the spring force of the Spiralfe ^¬ countries 72 downward toward the lower part 20th by virtue of the circumferential slope of said inner groove soft the detent balls 71 to the outside, so that the injector 10 can be placed on the mandrel 50 and that lower part of the injector 10 can sit on the bottom of the cup-shaped receiving opening 49. There, at the bottom of the pot-shaped receiving part 49 can sit pins 85 which can engage in to ^¬ mentioned connexion with Figures 1 and 2 fixing holes 12 of the injection nozzle 10 into the. When an intervention has been made, it is ensured that the injection nozzle 10 is initially inserted XY-correctly into the cup-shaped receiving opening 49 of the upper part 40 of the tool ^holder . If this is the case, the clamping sleeve 70 can be released again, whereby the detent balls 71 slip into the openings of the cup-shaped receiving part 49 of the upper part 40 and even protrude there in the direction of the injection nozzle 10 and thus ensure gel locking of the injector 10.

For easy handling of the clamping sleeve 70, it is expedient ^¬ SSIG that this is hen verse- on its outer periphery with a gripping groove.

For the eccentric shaft 60 presented in detail in connection with FIG. 7, it has proven to be advantageous to use a

Adjustment path in the height direction, ie in the Z direction, to provide about ± 0.15 mm. For this purpose, for example, a distance of 1.2 mm at the circumference of the eccentric shaft 60 correspond to a height change of ± 0.01 mm in the Z direction. It has proven to be expedient to provide the two cylindrical sections 63, 64 with a coating in order to facilitate the rotation of the eccentric shaft 60. Reference sign list tubular workpiece, injector high-precision bores

 fixing bores

20 lower part

21 centering element

22 centering element

23 centering element

24 centering element

26 centering pins

28 holes 40 upper part

 41 reference area

 42 reference surface

 43 ring wall

 44 radial bores

45 round flange

 46 radial bore

 47 radial bores

 48 axial bores

 49 pot-shaped receiving part

50 mandrel

 51 fixing screws

 52 ring surface

 53 Adjusting screw

58 radial bores

60 eccentric element

61 eccentric section 62 eccentric section

63 cylindrical section

64 cylindrical section

65 stop edge

 66 stop edge

 67 receiving opening

 68 receiving opening

 69 Flush groove

70 clamping sleeve

 71 locking elements

 72 spiral springs

 75 locking screws

76 gripping groove

81 Limiter screw

 82 Limiter screw

85 fixing elements

90 adjusting screws

A longitudinal axis

X, Y, Z directions

Claims

Device for positioning a tubular workpiece (10), in particular an injection nozzle, on a holder of a machine tool, with a workpiece holder, which can be fastened on the holder, and which holds the tubular workpiece (10) seated on a receiving mandrel (50), d a d u r c h e c e n c i n e s that the workpiece holder is formed in two parts with egg ^¬ nem attachable to the holder lower part (20) and one on the lower part (20) can be placed upper part (40), and with a first means for adjusting the height of the tubular workpiece (10), and with a second device for concentricity ustage of the workpiece (10). Device according to claim 1, In addition, a third device is provided for XY alignment of the upper part (40) to the lower part (20). Apparatus according to claim 1 or 2, That is, a fourth means is provided for adjusting the coaxiality of upper part (40) to lower part (20). Device according to one of claims 1 to 3, characterized in that the tubular workpiece (10) on the receiving mandrel (50) can be clamped. Device according to claim 4, characterized in that the clamping by means of a locking elements (71) beinhal ^¬ border clamping sleeve (70) is provided. Device according to claim 2, That is, the third device has one or more reference surfaces (41, 42) provided on the upper part (40). Device according to one of claims 1 to 6, characterized in that the first means comprises an eccentric element (60) on which a lower end of the receiving mandrel (50) sits on ^¬ , so that upon rotation of the eccentric element (60) is a height adjustment of the receiving ^mandrel (50) he follows ^¬ . Device according to claim 7, characterized in that the eccentric element (60) is an eccentric shaft, which is arranged orthogonal to the longitudinal axis (A) of the receiving mandrel (50) ^¬ . Device according to claim 8, characterized in that the eccentric shaft an intermediate eccentric portion (61) and at least one, preferably two externa ^¬ ßere cylindrical portions (63, 64) which have an enlarged diameter, so that between the central eccentric portion (61, 62) and the at least one outer cylindrical portion (63, 64) at least one stop edge (65, 66) is formed. 10. Device according to one of claims 8 or 9,  That is, the eccentric shaft is seated in a radial bore (46) of the top (40). 11. The device according to claim 10,  That is, the eccentric shaft is limited at both ends by restrictor bolts (81, 82). 12. Device according to one of claims 1 to 11,  That is, the receiving mandrel (50) in the upper part (40) of a plurality of Radial screws (75) can be clamped. 13. Device according to one of claims 1 to 12, characterized in that the upper part (40) with a round flange (45) the lower ^¬ part (20) at least partially overlaps. 14. Device according to claim 13,  That is, the fourth means comprises a plurality of adjusting screws (90) inserted in radial bores (58) of the round flange (45) of the upper part (40) and supported on a peripheral wall of the lower part (20). 15. Device according to one of claims 1 to 14, characterized in that the upper part (40) has an orthogonal to the longitudinal axis (X) lie ^¬ ing annular wall (43) which a plurality of Parallel to the longitudinal axis (A) located axial bores (48) for receiving adjusting screws, which are supported on a surface of the lower part (20). Device according to one of claims 1 to 15, characterized in that the upper part (40) has a cup-shaped receiving part (49) has for receiving the rohrformigen workpiece (10), where protrudes from the receiving part (49) of the receiving mandrel (50) forth ^¬ . Device according to claim 16, characterized in that at the bottom of the receiving part (49) at least one fixing ^¬ element (85), in particular a fixing pin, sitting. Device according to one of claims 1 to 17, characterized in that the lower part (20) is provided on its ge to the tool holder ^¬ oriented face with centering elements (21, 22, 23, 24). Device according to one of the preceding claims, characterized in that the upper part (40) and the lower part (20) are integrally formed from ^¬ .