Chuck.

[0001] The invention relates to a chuck for clamping thin-walled workpieces, with a chuck body, a the chuck body mounted on the chuck body and at least two associated workpiece support, relative to the workpiece support adjustable chuck jaws.

[0002] Such Chuck are known from practice, from the offered under the name plan splinter fodder be [...] -MT as power-operated Applicant for for tensioning and subsequent machining of thin-walled workpieces, in other words sinkers. Normally, it is needed, the sinkers to Edit from both sides, for which purpose it is necessary, turn the workpiece. This fitting bores in the sinkers are set, in soft pins are threaded, the overdimensioned comprise a light, to ensure a sufficient precision. A loading by means of gripper is thus excluded and a Automation not possible. As particular advantage is still to be considered that the accuracy is lost during the machining.

[0003] the invention is therefore based on the task, a chuck of the type named above so as to form, on both sides in thin-walled workpieces with one common situation is that a complete processing allows.

[0004] This problem is solved according to the invention wherein a chuck of the type named above thereby that the chuck body between a first, the machining of the upper side of the workpiece serving rotational position, and a second, the machining of the underside of the workpiece serving rotational position is adjustable that has access to the underside of the workpiece as the workpiece support an opening is provided that a workpiece is supported, the serves between a first, the support of the underside of the workpiece in the first rotational position serving position, and a second, the support of the top face of the workpiece in the second rotational position serving position is adjustable, and that is arranged on the axis of the workpiece is supported at least one pinion, which for realizing a pivot coupling in the cylinder chamber by at least one cylinder chamber and adjustable by pressure means associated with the chuck body, having a row of teeth, power piston.

[0005] Through the invention is ensured that both sides of the workpiece not only accessible, but also for the tool are achievable, since it is possible by the rotation of the chuck body from the chuck, and the other surface of the workpiece relative to the tool successively the to direct a. So it is possible, both sides of the workpiece in a clamping to Edit, so that no longer required by the re-chucking losses of accuracy are safe avoided. Furthermore is connected with this embodiment of the great advantage that any flexing of the thin-walled workpiece during the machining is avoided, since the force exerted by the tool on the workpiece has no influence on the deformation of the workpiece, but is introduced in the work piece support. The Chuck is positioned perpendicular to the machine spindle, to maintain the alignment of the workpiece with respect to the previously known Chuck.

[0006] Regarding the simplicity of the construction and the low space requirements it is favorable, if the chuck by a rotation about a longitudinal axis between the first rotational position and the second rotational position can be rotated, and if the adjustment is provided in which the workpiece is supported about an axis, perpendicular to the longitudinal axis of the chuck body and is oriented parallel to the plane defined by the workpiece support. The chuck body are rotated therewith about said mutually perpendicular axes and the work piece support.

[0007] is further provided in the frame of the invention that the work piece support has two compensating elements for plane-parallel support of the workpiece. This will ensure that the work piece support always rests in a planar manner against the workpiece and even independently of the workpiece thickness.

[0008] it has proved favourable As further, when the work piece support is designed with a projecting axle bearing of a half-moon, adjacent to which the compensating elements are mounted in recesses in a floating manner. The Appendix the workpieces to the compensating elements will be improved further, and the compensating elements which can be connected to a vacuum source by the work piece support when lines to mouths on the side facing the workpiece are guided.

[0009] Preferably, it remains that the supporting elements have matching bearing surfaces through the opening of the workpiece support, and in that on the clamping jaws and the workpiece support abutment, suitably to the bearings of the compensating elements are formed. Through this design is ensured that the voltage of the workpieces is in principle not be affected and that the situation in which the workpiece is supported by the workpiece is supported by the clamping jaws or. Workpiece support is defined.

[0010] By the completion of this rotating joint is a very space saving and [...] adjustment of the work piece support possible. In this connection it is also advantageous, when the power piston is approaching the end position associated with the soft a shock absorber.

[0011] in the frame of the invention it is preferably further, when two U-shaped carrier are arranged on the chuck body, in whose bottom section the cylinder chambers with the associated actuator piston and between the free ends, the clamping jaws, are arranged. By the chuck body is provided in the base leg associated U-shaped support place, to position the cylinder chamber with the power piston, during the free legs of the U-shaped beam serve for the arrangement of the clamping jaws. The clamping jaws are designed as perpendicular to the plane of the workpiece support adjustable gripping finger.

[0012] the invention is explained in what follows, embodiment shown in the drawing at a closer;

it show:

Fig. 1 a perspective view of the chuck according to the invention in the first rotational position,

Fig. 1 2 a representation corresponding with which the workpiece is supported in the second position the Fig.,

Fig. 2 3 a front view of the chuck in the configuration according to the invention from Fig. apparent,

Fig. 4 1 3 corresponding representation in one of the one of the corresponding configuration Fig. Fig.,

V-V 3 5 the intersection from Fig. Fig.,

6 the intersection Vl-Vl from Fig. Fig. 4,

7 the intersection VII-VII from Fig. Fig. 3,

Fig. [...] -VIII from Fig. 8 the intersection 4,

Fig. 3 representation corresponding one of the 9 Fig.,

10 X-X from the cut 9 Fig. Fig., and

11 the intersection XI-XI from Fig. Fig. 9,

[0013] 1 1 in the drawing is represented a chuck in Fig., the thin-walled workpieces 2 serves for tensioning, in other words in the embodiment shown in the drawing for tensioning thin-walled plates. The Chuck 1 has a chuck body 3 on, are arranged on the two U-shaped carrier 4, 5 are arranged between the free ends of clamping jaws, the serve for clamping the work piece 2. The chuck body 3, in other words in the embodiment shown in the drawing between the free ends of the U-shaped support 4, 6 is associated with a workpiece support. The clamping jaws 6 are perpendicular to the plane of the workpiece support 5 as adjustable gripping finger designed.

[0014] 3 is between a first chuck body The, the machining of the upper side 7 of the workpiece 2 serving rotational position and a second, the machining of the underside 8 of the workpiece serving adjustable rotary position. This the workpiece is accessible for the tool 2 in both rotational positions, the workpiece support 6 has an opening 9 as access to the side facing the workpiece support 2 on the workpiece 6.

[0015] 10 3 is associated with a work piece support the chuck body, between a first, the support of the underside 8 of the workpiece 2 in the first rotational position and a second position (1 Fig.) serving, the support of the upper side 7 of the workpiece 2 in the second rotational position serving position is adjustable.

[0016] 3 is by a rotation about its longitudinal axis between the chuck body The first rotational position and the second rotational position can be rotated. The adjustment takes place 10 in which the workpiece is supported about an axis, perpendicular to the longitudinal axis of the chuck body 3 and 6 is oriented parallel to the plane defined by the workpiece support. 1 and 2 the adjustment is evident in which the workpiece is supported off the Fig., for the machining of the workpiece must be rotated in the second rotational position in the chuck body 2 still Fig.. 7 and 8 is explained with reference to the Fig., 19 of the U-shaped support that in the 4 cylinder chambers 20 are formed basic thighs. In these cylinder chambers are adjustable by pressure means 20, 21 having a row of teeth 22 arranged actuating piston, the interaction with a pinion for realizing a pivot coupling 23, the 10 is arranged on the axis of the workpiece is supported. The power piston 24 associated with a shock absorber 22 is for soft approach to the end position.

[0017] Fig. 3 1 5 shows a longitudinal section through the chuck 10 to the chuck body in the second position in the first rotational position and in which the workpiece is supported. 5 in this case is evident from this Fig. that the work piece support 11 has two compensating elements 10, are provided the, order to achieve a plane-parallel Plant 10 and thus an effective planar support of the workpiece 2 in which the workpiece is supported. Fig. 5 also shows that the work piece support 12 is designed with a projecting journal bearings 10 of a half-moon, adjacent to which the compensating elements are mounted floatingly in receptacles 11 or 13 in pendulum fashion.

[0018] 10 leaves 9 in conjunction with further recognise Fig. Fig., 10 and 11 to 14 by the work piece support that lines the compensating elements are guided on the side facing the workpiece mouths 2. This lines are connectable to a vacuum source 14, all the more to promote further the installation of the workpiece 2 to the compensating elements 11. With these lines 14 monitor this and taking into account as a parameter in the control is increasing, 2 engages or rests correctly whether a workpiece. In the Fig. 5, 6 and 10 is evident that the work piece support 16 have matching bearing surfaces through the opening 9, all the more the thickness of the workpiece support when the facing side of the workpiece to the workpiece support 6 bridge need of the support 6.

5 and 6 are opposing bearing on the clamping jaws 17 formed so as to avoid the workpiece support, 11 18 by bearings arranged on the compensation, a large force is introduced into the workpiece 2 sure to.

In the following, described briefly now the voltage and processing a thin-walled piece of tool 2, in other words printed circuit board. This the circuit board is positioned on the workpiece support 6 and through the as gripping finger

Clamping jaws 5 tensioned. For the subsequent processing of the workpiece 2 is in the first position is adjusted so that the clamping The work piece support 10, in which the bottom surface 8 of the workpiece 2 is supported. Support being provided by the compensating elements according to the 11 6 Fig., wherein the plane-parallel support is additionally, by 2 acts through the lines 14 a vacuum to the workpiece.

After the processing of the workpiece 3 from the first rotary position is adjusted the chuck body 2 into the second rotational position and the work piece support 10 from the first position to the second position. After the workpiece -10 in the second position for engagement with the workpiece 2 has come, so the correct installation of the workpiece 2 is again generates the reduced pressure controlled and ensured 11 on the compensating element, so that with previously existing voltage of the workpiece 2 also the second side can be processed.

Chuck

Workpiece

Chuck Body

U-Shaped Support

Clamping Jaws

Workpiece Support

Upper Side

Underside

Opening

Workpiece Support

Compensating Elements

Journal Bearings

Receiving

Conduit

Contact Surface

Thrust Bearing

Bearing

Bottom Section

Cylinder Chamber

Tooth serially

Power Piston

Pinion

Shock Absorber