Power source controller of electrical discharge machine
First Claim
1. A power source controller of an electrical discharge machine for controlling a discharge pulse width and a quiescent period of a pulse discharge produced in a machining gap of the electrical discharge machine, comprising:
- a high-frequency component detecting unit that detects a high-frequency component superimposed on a discharge voltage at time of electrical discharge occurring in the machining gap;
a voltage level detecting unit that detects a voltage level of the discharge voltage;
a high-frequency component comparator that compares a magnitude relation between the high-frequency component detected by the high-frequency component detecting unit and a high-frequency component reference value;
a voltage level comparator that compares a magnitude relation between the voltage level detected by the voltage level detecting unit and a voltage level reference value;
a quiescent period control unit that, when abnormal electrical discharge is detected, outputs, based on a comparison result of the high-frequency component comparator and a comparison result of the voltage level comparator, a quiescent pulse that indicates an appropriate change in length of the quiescent period according to mode of occurrence of the abnormal electrical discharge, anda discharge pulse control unit that, when a comparison result of the voltage level comparator indicates the abnormal electrical discharge, reduces the discharge pulse width by cutting off application of voltage to the machining gap and subsequently performs change control of the quiescent period, which lasts until application of voltage to the machining gap, according to a quiescent period indicated by the quiescent pulse.
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Accused Products
Abstract
A discharge pulse control device cuts off a pulse width of the a discharge pulse being produced in a machining gap when a comparison result of a voltage level comparator indicates abnormal electrical discharge. Upon detection of abnormal electrical discharge based on comparison results of a high-frequency component comparator and the voltage level comparator, a quiescent period control unit constructed from a discharge pulse diagnosis device, a first pulse counter, a second pulse counter, and a quiescent pulse control device performs change setting of the quiescent period at the time of occurrence of abnormal electrical discharge and sends that information to the discharge pulse control device. Subsequently, the discharge pulse control device performs change control of the quiescent period at the time of occurrence of abnormal electrical discharge so that the discharge pulse and the quiescent time are optimally controlled.
14 Citations
12 Claims
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1. A power source controller of an electrical discharge machine for controlling a discharge pulse width and a quiescent period of a pulse discharge produced in a machining gap of the electrical discharge machine, comprising:
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a high-frequency component detecting unit that detects a high-frequency component superimposed on a discharge voltage at time of electrical discharge occurring in the machining gap; a voltage level detecting unit that detects a voltage level of the discharge voltage; a high-frequency component comparator that compares a magnitude relation between the high-frequency component detected by the high-frequency component detecting unit and a high-frequency component reference value; a voltage level comparator that compares a magnitude relation between the voltage level detected by the voltage level detecting unit and a voltage level reference value; a quiescent period control unit that, when abnormal electrical discharge is detected, outputs, based on a comparison result of the high-frequency component comparator and a comparison result of the voltage level comparator, a quiescent pulse that indicates an appropriate change in length of the quiescent period according to mode of occurrence of the abnormal electrical discharge, and a discharge pulse control unit that, when a comparison result of the voltage level comparator indicates the abnormal electrical discharge, reduces the discharge pulse width by cutting off application of voltage to the machining gap and subsequently performs change control of the quiescent period, which lasts until application of voltage to the machining gap, according to a quiescent period indicated by the quiescent pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power source controller of an electrical discharge machine for controlling a discharge pulse width and a quiescent period of a pulse discharge produced in a machining gap of the electrical discharge machine, comprising:
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a high-frequency component detecting unit that detects a high-frequency component superimposed on a discharge voltage at time of electrical discharge occurring in the machining gap; a voltage level detecting unit that detects a voltage level of the discharge voltage; a high-frequency component comparator that compares a magnitude relation between the high-frequency component detected by the high-frequency component detecting unit and a high-frequency component reference value; a voltage level comparator that compares a magnitude relation between the voltage level detected by the voltage level detecting unit and a voltage level reference value; and a thin-out number control unit that, when abnormal electrical discharge is detected, indicates, based on a comparison result of the high-frequency component comparator and a comparison result of the voltage level comparator, an appropriate change in number of discharge pulses to be thinned-out produced in the machining gap according to mode of occurrence of the abnormal electrical discharge, and is charge pulse control unit ha when a comparison result of the voltage level comparator indicates the abnormal electrical discharge, reduces the discharge pulse width by cutting off application of voltage to the machining gap and subsequently performs change control of the number of discharge pulses generated in the machining gap according to the thin-out number indicated by the thin-out number control unit. - View Dependent Claims (10, 11, 12)
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Specification