Device for controlling wire electrical discharge machining apparatus

A controller for controlling a wire electrical discharge machining apparatus including a machining unit that performs discharge machining on a workpiece by executing a machining program, the controller comprising:

• a storage unit that stores the machining program and a plurality of corner control patterns each of which is applicable to a respective one of corner parts;
• a control unit that performs corner control for switching to a prescribed machining condition based on a corner shape when machining is to be performed on the corner part;
• a calculation unit that calculates corner control segments from a start point and an end point of the corner control;
• a selection unit that selects, from the storage unit, one of the corner control patterns to be performed in a case where the corner control segments calculated by the calculation unit overlap;
• and
• a display unit that displays a drawing result of the machining program and the corner part where the corner control segments calculated by the calculation unit overlap,
• wherein in a case where a user selects one of the corner control patterns from the storage unit based on display of the display unit, the selection unit selects the corner control pattern selected by the user.