Clamping Device For Securing A Clamping Part

Abstract

A clamping device for the securing of a clamping part is provided. The clamping device includes a stop element and a radial clamping device which define an inner space to partly hold the clamping part. The radial clamping device in a clamped condition exerts a radial securing force on the clamping part. A radial spacing exists between the radial clamping device and a clamping bush radially enclosing the clamping device. The clamping bush and the radial clamping device are radially movable relative to one another, such that the radial clamping device is mounted floating in the clamping bush.

Claims

1. A clamping device for the securing of a clamping part, comprising: a stop element; a radial clamping device; and a clamping bush, wherein in an assembled state the stop element and the radial clamping device define an inner space configured to hold the clamping part, the radial clamping device is configured such that in a clamped condition the radial clamping device exerts a radial securing force on the clamping part, the radial clamping device is enclosed radially by the clamping bush, in the assembled state a radial spacing exists between the clamping bush and the radial clamping device, the clamping bush and the radial clamping device are radially movable with respect to one another, such that the radial clamping device is mounted floating in the clamping bush, and the clamping device is configured to be connected to a rotation device,

2. The clamping device as claimed in claim 1, wherein the stop element has a toothing which is a mating toothing to an end toothing of the clamping part.

3. The clamping device as claimed in claim 1, wherein the stop element has a mating toothing to a Hirth toothing.

4. The clamping device as claimed in claim 1, wherein the radial clamping device includes a collet chuck and a clamping ring radially enclosing the collet chuck, and the collet chuck has a wedge-shaped outside and the clamping ring has a wedge-shaped inside corresponding to the wedge-shaped outside of the collet chuck.

5. The clamping device as claimed in claim 4, wherein the clamping ring includes an end face formed as a shoulder configured to be engaged by an end region of the clamping bush.

6. The clamping device as claimed in claim 1, wherein the clamping bush and the radial clamping device are not secured to one another.

7. The clamping device as claimed in claim 1, wherein the clamping bush and the radial clamping device are inserted one into the other without radial interference.

8. The clamping device as claimed in claim 1, further comprising: a seal element configured to close off an end-face access to the radial spacing between the clamping bush and the radial clamping device.

9. The clamping device as claimed in claim 1, wherein the clamping bush is connected to a base body of the clamping device, and the base body of the clamping device is configured to be connected to the rotation device.

10. The clamping device as claimed in claim 9, further comprising: a connection device including a draw tube and a ball joint, the connection device being configured to be located between the base body and the rotation device.

11. The clamping device as claimed in claim 1, further comprising: a guide duct configured to guide medium into the inner space.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 a section through a clamping device with a first clamping part in the clamped condition in accordance with an embodiment of the present invention,

[0022] FIG. 2 a cutout of the clamping device of FIG. 1 without the clamping part and

[0023] FIG. 3 a section through a clamping device with a second clamping part in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows the condition in which a first clamping part 100 is clamped in a clamping device 1. Hence, a collet chuck is also described. The corresponding FIG. 2 shows the same clamping device 1, but without the clamping part 100. Therefore, both FIGS. 1 and 2 shall be discussed together.

[0025] The clamping part 100 here is, for example, a workpiece, having a Hirth toothing and undergoing machining. For the machining, the clamping part 100 is clamped and turned about an axis by a rotation devicenot shown here. The clamping here occurs in particular by way of a radial force, which is exerted on the clamping part 100 in the clamped condition and thereby holds it firmly.

[0026] The clamping device 1 has a stop element 2, against which the clamping part 100 thrusts. The stop element 2 is surrounded radially by a collet chuck 3. The stop element 2 and the collet chuck 3 are designed and arranged relative to each other in such a way that a free inner space 4 (see FIG. 2) is produced at the end face 5 of the clamping device 1. This inner space receives (as shown in FIG. 1) an end face of the clamping part 100. Further details about this will be seen in connection with FIG. 2.

[0027] The collet chuck 3 is radially surrounded by a clamping ring 6.

[0028] The collet chuck 3 has a wedge-shaped outside and the clamping ring 6 has a wedge-shaped inside. The two wedge shapes are adjusted or correspond to each other such that the best possible contact surface is produced between the two components 3, 6 and such that in the clamped state the collet chuck 3 exerts the mentioned radial force on the clamping part 100. Thus, the collet chuck 3 and the clamping ring 6 together form a radial clamping device 36 (see FIG. 2) for generating the radial securing force for the clamping part 100.

[0029] On its outside, the clamping ring 6 terminates at the end face with a shoulder 7, engaging with an end region 8 of the clamping bush 9. The clamping bush 9 therefore radially encloses the radial clamping device 36 and also in particular the outwardly situated clamping ring 6 here.

[0030] The clamping bush 9 itself is connected by a screw 10 to a base body 11 of the clamping device 1.

[0031] The longitudinal axis 12 of the clamping device 1 in the embodiment shown is also the longitudinal axis of the clamping part 100 and it is the axis about which the rotation occurs by means of the rotation devicenot shown here. As can be seen, there is a slight limiting of the clamping movement in the form of a spacing in the axial direction between the clamping ring 6 and the clamping bush 9.

[0032] There is no radial securing between the clamping bush 9 and the clamping ring 6. The clamping bush 9 and the clamping ring 6 are merely inserted one into the other and not joined together. This makes possible the radial mobility for balancing out the center offset.

[0033] There is a radial spacing 13here, for example, as an air gapbetween the clamping bush 9 and the clamping ring 6. So that no contaminants can get into this gap, at the end face a seal element 14 is provided (here in the form of an O-ring) in a recess 15 (here in the clamping bush 9, for example).

[0034] The radial spacing 13 between the clamping ring 6 and the surrounding clamping bush 9 and thus between the radial clamping device 36 and the clamping bush 9 brings about the floating mount of the radial clamping device 36. The floating mount makes it possible to balance out a center offset relative to the toothing of the respective clamping part 100.

[0035] Adjacent to the base body 11 is a connection device 16, enabling a connection to the rotation devicenot shown here. The connection device 16 in the embodiment shown comprises a draw tube 17 and a ball joint 18. The articulated connection enables balancing out of axial errors of the spindle.

[0036] It will be noticed in particular in FIG. 2 that the stop element 2 and the collet chuck 3 surround and form an inner space 4 in the end face 5 of the clamping device 1.

[0037] Furthermore, it can be seen that the stop element 2 comprises a toothing 19. This toothing 19 in particular is a mating toothing (or in general a corresponding toothing) to the toothing of the clamping part 100. The toothing 19 brings about a securing against twisting of the clamping part 100. Furthermore, in this way the toothing of the clamping part 100 is itself centered. The radial balancing of the radial clamping device 36 occurs by way of the spacing 13 and also by way of the lack of radial connection to the radially enclosing clamping bush 9.

[0038] The association of the toothing 19 with the respective clamping part 100 means that, depending on the nature of the toothing, each clamping part type requires its own stop element 2. Furthermore, the outer diameter of the clamping part 100 requires a different collet chuck 3 each time.

[0039] FIG. 3 shows the case of a second, alternative clamping part 100.

[0040] The clamping devices 1 of the embodiments of FIG. 1 and FIG. 3 differ from each other only in regard to the stop element 2 and the collet chuck 3. This also yields the advantage that, when switching between two different clamping parts 100, only two components of the clamping device 1 need to be changed. Since the collet chucks 3 each time have the same outer contour and especially the same wedge shape, they may be combined each time with the same clamping ring 6.

[0041] FIG. 3 furthermore indicates schematically the rotation device 200, which brings about the rotation of the clamping device 1 about the longitudinal axis 12.

[0042] Behind the end face of the stop element 2 with the toothing 19 runs a medium guide duct 20 in order to supply media, such as air for air control, to the inner space 4. Alternatively, a cooling medium can be brought up, in order to also clean the inner space 4 of shavings, for example.

[0043] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.