Clamping device for machine tools

Abstract

A clamping device has a collet or a sleeve that contains an inner coolant supply. The non-through parts of the clamping device have formed therein radial slits and/or intermediate slits that open at the machine side and/or the tool side of the shank of the device. The slits and non-through parts of the device are arranged in such a way that they form a coolant barrier.

What is claimed is:  
     
       1. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that at least one of the sleeve element and the sleeve housing have formed therein a plurality of axially extending radial slots which open onto a machine side of the device and a plurality of axially extending intermediate slots, wherein one of the intermediate slots is neither open onto the tool side of the device nor open onto a machine side of the device, and wherein the intermediate slots, the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       2. A clamping device according to claim  1 , characterized in that the sleeve element is made of a material selected from the group consisting of hardened spring steel, tool steel and beryllium bronze. 
     
     
       3. A clamping device according to claim  1 , characterized in that the sleeve element has a bore. 
     
     
       4. A clamping device according to claim  1 , characterized in that the sleeve element is mechanically fixed within the device and about the tool shank. 
     
     
       5. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that at least one of the sleeve element and the sleeve housing have formed therein a plurality of axially extending radial slots which open onto a tool side of the device and a plurality of axially extending intermediate slots, wherein one of the intermediate slots is neither open onto the tool side of the device nor open onto a machine side of the device, and wherein the intermediate slots, the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       6. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that the sleeve element has formed therein a plurality of axially extending radial slots which open onto a tool side of the device and a plurality of axially extending intermediate slots, wherein one of the intermediate slots is neither open onto the tool side of the device nor open onto a machine side of the device, and wherein the intermediate slots, the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       7. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that the sleeve element has formed therein a plurality of axially extending radial slots which open onto a machine side of the device and a plurality of axially extending intermediate slots, wherein one of the intermediate slots is neither open onto the tool side of the device nor open onto a machine side of the device, and wherein the intermediate slots, the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       8. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that at least one of the sleeve element and the sleeve housing have formed therein a plurality of axially extending radial first slots which open onto a machine side of the device and a plurality of axially extending radial second slots which open onto a tool side of the device, wherein the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       9. A clamping device for placement between a tool shank with a bore and a machine tool having an internal coolant supply, the device comprising a sleeve element extending along an axis and a sleeve housing, characterized in that the sleeve element has formed therein a plurality of axially extending first radial slots which open onto a machine side of the device and a plurality of axially extending second radial slots which open onto a tool side of the device, wherein the radial slots, the tool shank and the sleeve housing form a coolant barrier that prevents the flow of coolant from the device except through the bore. 
     
     
       10. A clamping device between a tool shank and a machine tool, especially a cutting tool with an internal coolant supply, comprising a collet chuck and a collet chuck housing or a clamping sleeve and a clamping sleeve housing, characterized in that the collet chuck or clamping sleeve has axially extending radial slots, at least some of which open on one side only of the chuck or sleeve and that the slots define non- through parts that are fixed to the tool shank and at least partially to the collet chuck housing or clamping sleeve housing in such a way as to form a coolant barrier together with the tool shank and with that housing.   
     
     
       11. A clamping device according to claim  10 , characterized in that the collet chuck or clamping sleeve has radial slots open in alternating sequence on the tool side and on the machine side. 
     
     
       12. A clamping device according to claim  10 , characterized in that the collet chuck or clamping sleeve is fixed mechanically or hydraulically to the chuck housing or sleeve housing, respectively. 
     
     
       13. A clamping device between a tool shank and a machine tool, especially a cutting tool with an internal coolant supply, comprising a collet chuck and a collet chuck housing or a clamping sleeve and a clamping sleeve housing, characterized in that the collet chuck or clamping sleeve has axially extending radial slots, at least some of which open on one side only of the chuck or sleeve and others of which are intermediate and are open at neither end, and that the slots define non- through parts that are fixed to the tool shank and at least partially to the collet chuck housing or clamping sleeve housing in such a way as to form a coolant barrier together with the tool shank and with that housing.   
     
     
       14. A clamping device according to claim  13 , characterized in that the collet chuck or clamping sleeve has radial slots open on the tool side and has radial intermediate slots, in alternating sequence.