Machine tool auxiliary function hydraulic system

Details Machine tool auxiliary function hydraulic system Machine tool auxiliary function hydraulic system

1990-02-22

1992-07-07

Terrell, William E.

Turning

Lathe

With program control

82142, 82165, B23B 1900, B23B 704

Patent

active

051272911

ABSTRACT:
An auxiliary-function hydraulic system is provided for a computerized numerical control (CNC) machine tooling unit. Hydraulic power is provided for locking collet or chuck to an open or closed position and providing an affirmative collet-open and/or collet-closed signal to communicate the collet position to the host computer. The tailstock can be brought gently forward to contact a workpiece and can be returned rapidly to the home position, with a break-away pressure feature being employed to overcome initial static friction. A pressure switch indicates that the tailstock is in position against the workpiece. A spindle brake applies braking to the spindle to stop the same from high speed either on command or in the event of system failure. In the latter case, braking occurs prior to loss of pressure to the collet closer cylinder. Also, a turret clamp locks and unlocks a tool changer turret.

REFERENCES:
patent: 3771802 (1973-11-01), Hiramatu et al.
patent: 3945275 (1976-03-01), Ovanin
patent: 4414871 (1983-11-01), Trout
patent: 4493242 (1985-01-01), Rohm
patent: 4507993 (1985-04-01), Silverman et al.

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