Patent ID: 8653401

Claim:
A wire electric discharge machining apparatus having a function of automatically selecting an automatic wire-connection parameter, comprising: an execution part that executes automatic wire connection according to a plurality of parameters determining a condition for performing the automatic wire connection; a wire electrode line wire-connection failure section detection part that detects a wire-connection failure section in a running path of a wire electrode when wire connection by the automatic wire connection by the execution section is unsuccessful; a count/storage part that counts and stores the number of failures of the wire connection in the wire electrode line wire-connection failure section; a parameter set storage part that stores a parameter set as a combination of the plurality of parameters in association with the wire electrode line wire-connection failure section; and a parameter set switching part that selects and adopts, based on a count value stored in the count/storage part, the parameter set as a default condition for performing an automatic wire connecting operation from among the parameter sets each associated with the wire electrode line wire-connection failure section and stored in the parameter set storage part when the wire connection is unsuccessful even in a preset wire connecting operation.