Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-06-22
1992-09-22
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
137551, 137334, 165 111, 165 14, 340593, 340596, 340679, 340680, G08B 1706
Patent
active
051501023
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an alarm device attached to an electrical discharge machine, and more particularly, to an alarm device adapted automatically to give an alarm when the temperature of a machining fluid deviates from a predetermined temperature range during electrical discharge machining.
BACKGROUND ART
If the temperature of a machining fluid fluctuates during electrical discharge machining, the specific resistance of the machining fluid and hence, the machining speed, fluctuate, and also, the dimensions of a workpiece vary. As a result, the stability of the electrical discharge machining is ruined, and the machining accuracy is lowered. Conventionally, therefore, when the machining fluid temperature detected by means of a temperature sensor, such as a thermostat, exceeds an allowable upper limit value, the operation of a cooler for cooling the machining fluid is started. When the machining fluid temperature is lower than an allowable lower limit value, the operation of the cooler is stopped. Thus, the machining fluid temperature is controlled within a predetermined range of temperature.
Even in an electrical discharge machine provided with such a machining fluid temperature control system, however, if the cooler or the temperature sensor goes wrong, or if the electrical discharge machining is executed without connecting the cooler to the power supply, for example, the machining fluid temperature deviates from the predetermined temperature range, so that the aforementioned awkward situation is entailed. Namely, the stability of the electrical discharge machining is ruined if the machining fluid temperature rises too high, or the machining fluid is frozen if it is excessively cooled, for example.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a machining fluid temperature deviation alarm device used in an electrical discharge machine and adapted automatically to give an alarm when the machining fluid temperature deviates from a predetermined temperature range during electrical discharge machining.
In order to achieve the above object, according to the present invention, there is provided a machining fluid temperature deviation alarm device attached to an electrical discharge machine, in which a machining fluid temperature adjuster is controlled so that a detected machining fluid temperature is within an allowable temperature range, in response to an output signal of a temperature sensor indicative of whether the machining fluid temperature is within said allowable temperature range.
This alarm device comprises a setter for setting a predetermined temperature range covering the allowable temperature range, a second temperature sensor provided independently of the temperature sensor, and alarm means. The second temperature sensor detects the machining fluid temperature, determines whether the detected machining fluid temperature is within the predetermined temperature range, and delivers a signal indicative of the result of the determination. The alarm means gives an alarm in response to the output signal of the second temperature sensor, indicative of a deviation of the detected machining fluid temperature from the predetermined temperature range.
Preferably, the machining fluid temperature deviation alarm device includes halt means for stopping the operation of the electrical discharge machine in response to the output signal of the second temperature sensor, indicative of the deviation of the detected machining fluid temperature from the predetermined temperature range.
According to the present invention, as described above, the alarm is given when the machining fluid temperature deviates from the predetermined temperature range which covers the allowable temperature range, due to some trouble in the machining fluid temperature sensor or the machining fluid temperature adjuster, or a failure to connect the temperature adjuster to the power supply, and preferably, the operation of the electrical discharge machine is stopped when the alarm i
REFERENCES:
patent: 3927571 (1975-12-01), Athey
Fanuc Ltd
Swann III Glen R.
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