| CPC B23H 1/022 (2013.01) [B23H 1/028 (2013.01); B23H 1/04 (2013.01)] | 5 Claims |
|
1. A control device which controls a wire electrical discharge machine having a servomotor causing a wire electrode and a workpiece to relatively move, the control device measuring a relative position of the wire electrode and the workpiece by detecting contact between the wire electrode and the workpiece which had been made to relatively move, the control device comprising a CPU, the CPU being configured to:
set a pulse cycle of a detection voltage applied to an electrode gap between the wire electrode and the workpiece;
control a power supply connected to the control device to apply the detection voltage to the electrode gap at the set cycle;
control relative movement speed by way of the servomotor; and
detect contact between the wire electrode and the workpiece, based on a change in the applied detection voltage detected by a sensor,
wherein the CPU, after executing a first detection operation of contact between the wire electrode and the workpiece at a first relative movement speed and a first pulse cycle of the detection voltage applied by the power supply, executes a second detection operation of contact between the wire electrode and the workpiece, at a second relative movement speed which is slower than the first relative movement speed, and at a second pulse cycle of the detection voltage applied by the power supply which is longer than the first pulse cycle, and
wherein the CPU, after execution of the first detection operation, and prior to execution of the second detection operation, causes the wire electrode and the workpiece to relatively move in a distancing direction.
|