Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Patent
1999-03-24
2000-06-27
Briggs, William
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
408239R, B23C 526, B23B 3110
Patent
active
060799196
ABSTRACT:
For increasing the tensile force on the draw rod (4) of a tool spindle clamping device, in addition to a first, pretensioned spring assembly (8) between the draw rod (4) and sleeve (1) is a second spring assembly (15), which is coupled in pretension with a fastener (17, 18) between the proximal end of the sleeve (1) and the proximal end of the draw rod (4). In operation, the two spring assemblies (8, 15) act in parallel and lead to a tensile force of approximately 18,000 to 20,000 N with which the cone (7) of a tool (6) fixed to the draw rod (4) is drawn into an internal cone (2) of the sleeve (1). For ejecting the tool (6), the second spring assembly (15) is uncoupled from the draw rod (4) and the draw rod is moved against the distal end of the sleeve (1). For uncoupling the second spring assembly (15) from the draw rod, a hydraulically operated piston (20) is provided at the proximal end of the clamping device. In the piston (20) is a further, hydraulically operated piston (22) with which the fastener (17, 18) is opened and the draw rod (4) is displaced counter to the spring tension of the first spring assembly (8). The clamping device which, compared with known clamping devices, exerts a much higher tensile force on the tool, and is advantageously used for high speed, high precision machining operations.
REFERENCES:
patent: 3490333 (1970-01-01), Scruton
patent: 3633457 (1972-01-01), Reeber et al.
patent: 4604009 (1986-08-01), Tenneastedt
patent: 4764064 (1988-08-01), Greinice
patent: 4836723 (1989-06-01), Flammini
patent: 5425606 (1995-06-01), Kelch
patent: 5662442 (1997-09-01), Taki et al.
Briggs William
C.R.I.D. S.A.
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