Wire electric discharge machine having peak current compensation function

摘要

A wire electric discharge machine is configured to machine a workpiece by computing an electric current at the machining time before starting a main machining and compensating a power source voltage for machining. The wire electric discharge machine measures an average electric current and an electric discharge frequency at the machining time, in a measuring section in an approach before the main machining, and computes a peak current at the machining time. Further, an electric voltage of a machining power source is compensated by comparing the computed peak current at the machining, with a reference peak current.

主权项

1. A wire electric discharge machine for applying electric voltage between a wire electrode and a workpiece while changing a relative position between the wire electrode and the workpiece, the wire electric discharge machine comprising:
a first detecting unit configured to detect an average electric current; a second detecting unit configured to detect an electric discharge frequency; a determining unit configured to determine, when starting a machining, whether or not the machining is a machining in an approach up to a machined shape required as a product; a computing unit configured to, when the determining unit determines that the machining is carried out in the approach,
set, in the approach, a measuring section for measuring the average electric current and the electric discharge frequency when the machining is carried out in the measuring section, andcompute a peak current when the machining is under way, on the basis of the average electric current and the electric discharge frequency detected when the machining is carried out in the set measuring section; a memory unit configured to store a reference peak current; a comparing unit configured to compare the peak current computed by the computing unit with the reference peak current stored in the memory unit; and a compensation voltage calculating unit configured to calculate an electric voltage of a machining power source for compensating the peak current at a portion where machining of the machined shape is carried out, on the basis of a result of comparison by the comparing unit.