Ultra-precision temperature control system for machine tool and

Details Ultra-precision temperature control system for machine tool and Ultra-precision temperature control system for machine tool and

1994-09-06

1995-12-19

Ford, John K.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 47, 236 78B, 236 91F, 236 78D, 62DIG10, 62434, 62435, 62201, F25B 2900

Patent

active

054761379

ABSTRACT:
A control system for effecting ultra-precision temperature control for a controlled system having large load fluctuations or including a dead time component. A control unit (5) instructs a high-precision PID temperature controller (10) to renew and correct a control target value T.sub.0,NEW for the supply fluid temperature T.sub.0 only by a temperature difference .DELTA.T=T.sub.C -T.sub.2 between a set value T.sub.C for the return fluid temperature T.sub.2 of a heat transfer fluid and the actually controlled return fluid temperature T.sub.2. In response to the instruction, the high-precision PID temperature controller (10) controls the heating power of a heater (17) for heating control through a constant-power thyristor phase controller (16). The heater (17) heats the heat transfer fluid and sends it to a machining apparatus (1) through a closed damping tank (21). The heat transfer fluid exchanges heat with the machining apparatus (1) and is then returned to a precooling means.

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"Constant Power Thyristor Controller", Bob Electronic Co., Ltd., Tokyo, Japan.
Publication 1-51253, Spindle Temperature Controlling Method and Device for Machine Tool, (abstract only), Feb. 27, 1989 (Hiroyuki Fujita).
Fishbeck, James, "Writing P-I-D Control Loops Easily in BASIC", Control Engineering, vol. 25, No. 10, Oct. 1978, pp. 45-47.

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