Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
Device for clamping unstable workpieces (2) with uneven clamping surface (3) for metal-cutting processing, with - preferably three axially adjustable seating devices (7) which are fixed to the chuck, - a plurality of suction troughs (5, 6) of elastic material which are mounted to the chuck, - a device for vacuum-loading the suction troughs (5, 6), so that a workpiece (2) is fixed against the suction troughs (6), and - a plurality of axially movable bolts (13, 14) for additional support of the workpiece, which are adjustable independently from the seating devices (7), wherein the bolts (13, 14), after having secured the workpiece (2), are fixed in positive abutment against the clamping surface (3), characterised in that - a centring device for the workpiece (2) and - a fluid-operated, controllable device for axial adjustment of the bolts (13, 14) is provided, - the seating device (7) is arranged centrally in the suction troughs (5, 6), - the respective suction troughs (6) with seating devices (7) as well as the bolts (13, 14) are separately activated and - caps (15) are provided to block movement of the bolts (14) which are not covered by the workpiece (2) in the direction towards the workpiece.
Claim 2
Dependent Claim
42 words
Device according to claim 1, characterised in that a pneumatic device (31, 33) is provided as a controllable device for axial adjustment of the bolts (13, 14), and a hydraulic device (16) is provided for tightening bolts (13) abutting the workpiece (2).
Claim 3
Dependent Claim
32 words
Device according to claim 2, characterised in that the hydraulic device (16) and the vacuum device (4) remain operational during rotation of the clamping device (1) whilst the workpiece is being processed.
Claim 4
Dependent Claim
80 words
Device according to one of claims 1 to 3, characterised in that in the centre of the suction troughs (5, 6) are provided bolts (7, 10̸), the short bolts (10̸) of which press the suction troughs (5) downwards and together, thus closing vacuum channels (12), and that the long bolts (7) keep the suction troughs (6) released and the vacuum channels (12) open and serve as spot seating for the workpiece (2) by means of their bulky bolt heads (9).
Claim 5
Dependent Claim
136 words
Device according to one of claims 1 to 4, characterised in that the hydraulic device (16) comprises bushes (17), circular chambers (18) which surround the latter, a hydraulic master chamber (19), hydraulic channels (21) which connect ring and main chambers, and a device (22) for clamping and releasing the hydraulic device (16), that this device (22) comprises a hydraulic piston (23), a spring assembly (24), a spring plate (25) and a bolt (26), by means of which the spring plates (25) are supported against a stop plate (27) and the chamber pressure is set, in which respect the hydraulic device (16) is released, or in reverse tensioned, by means of a mechanical force which is applied via a quill (28) and compressed-air-channel wall (29) to the hydraulic piston (23) and which compresses the spring assembly (24).
Claim 6
Dependent Claim
20 words
Device according to claim 5, characterised in that the hydraulic pressure is at least 25 bar, preferably approximately 45 bar.
Claim 7
Dependent Claim
50 words
Device according to one of claims 1 to 6, characterised in that the compressed-air channel (31) is separable by means of a cone (30̸) and quill (28), in which respect in the event of separation the compressed-air channel (31) are sealed towards the vacuum chamber (32) by conventional magnetic valves.
Claim 8
Dependent Claim
29 words
Device according to one of claims 1 to 7, characterised in that an exchangeable guide bolt (34) with integrated centring disc (35) is provided in the clammping device (1).
Claim 9
Dependent Claim
46 words
Device according to one of claims 1 to 7, characterised in that , for the purpose of radial fixing of workpieces without central bore or central recess, bolts are screwed into the clamping device (1), and that the guide bolt (34) has no centring disc (35).