Wire electrical discharge machine with deterioration detection function for feeder

A wire electrical discharge machine which performs removal machining of a workpiece by applying a voltage to a machining gap between a wire electrode and the workpiece through a feeder to generate electrical discharge, the wire electrical discharge machine comprising:

• a feeder deterioration detection unit configured to detect deterioration of the feeder, wherein,
• the feeder deterioration detection unit configured to detect deterioration of the feeder comprises:
• a resistance voltage detector configured to detect an inclination of a voltage applied to a resistor connected in series with the machining gap and the feeder, and
• a storage unit in which a data table preloaded with a reference value for the inclination of the voltage applied to the resistor is stored, the reference value being the inclination of the voltage applied to the resistor when the machining gap is short-circuited with the feeder in a normal state,
• wherein the deterioration of the feeder is detected if the inclination of the voltage currently applied to the resistor with the machining gap short-circuited is smaller than the reference value loaded in the data table.

A wire electrical discharge machine for performing removal machining of a workpiece by applying a voltage to a machining gap between a wire electrode and the workpiece through a feeder to generate electrical discharge, the wire electrical discharge machine comprising:

• a machining current detector configured to detect a machining current value during the machining;
• a discharge frequency detector configured to detect a number of electrical discharges during the machining;
• and
• a numerical controller configured to
• store a data table loaded with a reference current value for each electrical discharge, and
• detect deterioration of the feeder based on a result of comparison between (1) the machining current value detected by the machining current detector and (2) the product of (a) the number of electrical discharges detected by the discharge frequency detector and (b) the reference current value for each electrical discharge loaded in the stored data table.