Collet Chuck

Abstract

Collet chuck having a plurality of jaws which are radially movable with respect to one another and which, with their clamping faces, form a common receptacle for guiding a rod that is to be machined in a lathe, characterized by a blind hole which is routed in at least one jaw from the outer face, opposite the clamping face of the jaw, in the direction of the clamping face, with a blind-hole bottom which is delimited on the one hand by the clamping face and on the other hand by the blind hole and which, through wear of the clamping face, is configured to effect the formation of a through-hole indicating the wear of the collet chuck.

Claims

1. A guide bush with a collet chuck, which is mounted axially displaceably in a collet chuck holder, having a plurality of jaws which are radially movable with respect to one another and which, with their clamping faces, form a common receptacle for guiding a rod that is to be machined in a lathe, comprising: a blind hole which is routed in at least one jaw from the outer face, opposite the clamping face of the jaw, in the direction of the clamping face, with a blind-hole bottom which is delimited on the one hand by the clamping face and on the other hand by the blind hole and which, through wear of the clamping face, is configured to effect the formation of a through-hole indicating the wear of the collet chuck and a device communicating with the bottom of the blind hole of the collet chuck, the device being designed to output an alarm signaling the wear of the collet chuck when a through-hole is formed due to wear of the bottom of the blind hole, wherein the device is designed for applying compressed air to the blind hole, for detecting the air pressure in the blind hole and, in the event of a drop in air pressure detected due to the formation of the through-hole, for outputting the alarm signalling the wear of the collet chuck.

2. The collet chuck according to claim 1, further comprising a marking arranged in the bottom of the blind hole and indicating the wear of the collet chuck when a through-hole is formed.

3. The collet chuck according to claim 2, wherein the marking is wear-resistant.

4. The collet chuck according to claim 1, further comprising a wear-prone electrical component arranged in the bottom of the blind hole, the loss of function of which indicates the wear of the collet chuck.

5. The collet chuck according to claim 4, wherein the electrical component is an electromagnetic coil, a resistor or an RFID chip.

6. The collet chuck according to claim 2, wherein the marking or the electrical component is arranged in the bottom of the blind hole, spanning the blind hole.

7. The collet chuck according to claim 1, wherein the blind hole is arranged radially.

8. (canceled)

9. (canceled)

10. The guide bush according to claim 1, wherein the device is designed for communication with the wear-prone electrical component arranged in the bottom of the blind hole, the device being designed for outputting the alarm signaling the wear of the collet chuck in the event of an interruption in communication between the device and the electrical component.

Description

[0023] The invention is explained in more detail below with reference to a particularly preferably designed embodiment shown in the accompanying drawings, wherein:

[0024] FIG. 1 shows a longitudinal section through a particularly preferably designed collet chuck according to the invention;

[0025] FIG. 2 shows a further longitudinal section through the particularly preferably designed collet chuck in a detailed view.

[0026] FIG. 1 shows a particularly preferably designed example of a collet chuck according to the invention in a longitudinal section. In the example shown, the collet chuck 10 has three jaws 20a, 20b that can move radially towards each other, of which two jaws 20a, 20b can be seen in the sectional view. The three jaws 20a, 20b formas is knownwith their clamping surfaces 30a, 30b a common holder for guiding a rod to be machined in a lathe. In addition, receptacles 60 provided for fastening spring elements arranged between the jaws 20a, 20b can be recognised in one jaw 20b.

[0027] According to the invention, a blind hole 50 extending radially from the outer surface 40a, 40b opposite the clamping surface 30a, 30b of the jaw 20a, 20b in the direction of the clamping surface 30a, 30b is provided in at least one jaw 20a, 20b, wherein the bottom of the blind hole is bounded on the one hand by the clamping surface 30a, 30b and on the other hand by the blind hole 50. The thickness of the bottom of the blind hole corresponds to the predetermined maximum permissible wear-related material removal, which causes the formation of a through-hole indicating the wear of the collet chuck 10.

[0028] To indicate wear, a particularly wear-resistant marking can preferably be provided in the bottom of the blind hole, which is exposed when a through-hole is formed and indicates the wear of the collet chuck 10.

[0029] Alternatively, an electrical component susceptible to wear can be provided in the bottom of the blind hole, the loss of function of which indicates the wear of the collet chuck. The electrical component is in particular a electromagnetic coil, a resistor or an RFID chip.

[0030] It is particularly preferable for the marking or the electrical component to be arranged in the bottom of the blind hole, spanning the blind hole 50, so that it basically remains in the area of the originally formed bottom of the blind hole when the through-hole is formed.

[0031] FIG. 2 shows a further longitudinal section through the particularly preferably designed collet chuck in a detailed view, from which it can be seen that the bottom of the blind hole has a small thickness, which corresponds to the maximum permissible wear for the use of the collet chuck 10. If the bottom of the blind hole is completely removed due to wear of the clamping surfaces 30a, 30b, this wear can be recognised by detecting a through-hole instead of a blind hole and the collet chuck 10 can be replaced.