WIRE ELECTRIC DISCHARGE MACHINE INCLUDING CONTROL MEANS FOR HOLDING WIRE ELECTRODE AT DESIRED ANGLE

摘要

A relationship between a weight of a reel supported by a column of a wire electric discharge machine when a wire electrode is wound around the reel, and an amount of slanting of the wire electrode when the wire electrode extended between an upper wire guide and a lower wire guide becomes slanted as a result of the column being deformed by the weight of the reel is stored. The weight of the reel is determined during electric discharge machining, and the amount of slanting of the extended wire electrode is determined from the weight of the reel. A compensation amount for the slanting of the wire electrode is determined from the amount of slanting, and the slanting of the wire electrode is compensated by the compensation amount.

主权项

1. A wire electric discharge machine including a reel which is supported by a column and around which a wire electrode is wound, and an upper wire guide and a lower wire guide which support the wire electrode that is drawn out from the reel, and carrying out electric discharge machining of a workpiece fixed on a table by relatively moving the wire electrode extended between the upper wire guide and the lower wire guide with respect to the workpiece according to a command of a machining program, the wire electric discharge machine comprising:
wire electrode slanting amount storage means for storing a relationship between a weight of the reel and a slanting amount of the extended wire electrode; reel weight acquiring means for determining the weight of the reel during electric discharge machining; compensation amount calculating means for determining the slanting amount of the wire electrode corresponding to the weight of the reel determined by the reel weight acquiring means by referring to the wire electrode slanting amount storage means, and determining a compensation amount for the slanting of the wire electrode from the determined slanting amount; and control means for relatively moving the wire electrode with respect to the workpiece so as to compensate the slanting of the wire electrode by the compensation amount for the slanting of the wire electrode determined by the compensation amount calculating means.