Method for detecting malfunction in clamping and machine tool

Details Method for detecting malfunction in clamping and machine tool Method for detecting malfunction in clamping and machine tool

2007-06-28

2008-12-09

Ross, Dana (Department: 3726)

Metal working

Plural diverse manufacturing apparatus including means for...

Type of machine

C409S131000, C082S001110, C700S175000, C324S076110, C324S722000, C318S625000

Reexamination Certificate

active

07461439

ABSTRACT:
The method for detecting any clamping malfunction of the work within the machine tool which clamps both ends of the work with clamping mechanisms23, 24of a pair of headstocks19, 29,and processes the work by spinning the work through synchronous rotation of main spindles21, 22of the pair of headstocks by servomotors33, 34,wherein, after clamping the both ends of the work27with the clamping mechanisms23, 24of the respective headstocks19, 20,and while both the servomotors33, 34of the headstocks are in a servo-ON state, a command for a minute angle α rotation is given to the servomotor34of only one of the headstocks, and at this point, any malfunction in clamping is determined when a current or torque generated within the servomotor of one or the other of the headstocks is smaller than a predetermined value.

REFERENCES:
patent: 3641849 (1972-02-01), Kinney
patent: 3866212 (1975-02-01), Simon et al.
patent: 4629956 (1986-12-01), Nozawa et al.
patent: 6758640 (2004-07-01), Mizutani et al.
patent: 7056072 (2006-06-01), Mizutani et al.
patent: 7183735 (2007-02-01), Heinemann
patent: 2002-239873 (2002-08-01), None

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