REPLACEMENT DETERMINATION DEVICE FOR ELECTRICAL DISCHARGE MACHINING ELECTRODE AND REPLACEMENT DETERMINATION METHOD

摘要

A replacement determination method: detects the remaining length of the electrode; detects the electrical discharge commencement position, being the position of the electrode when electrical discharge starts; detects the throughole position, being the position of the electrode when the workpiece is pierced; sets the required length for the electrode as required for machining the next throughhole, on the basis of the difference between the detected electrical discharge commencement position and the detected throughole position; compares the detected remaining length and the set required length; and determines whether or not electrode replacement is required.

主权项

1. A replacement judgment apparatus for an electrode for electrodischarge machining which judges a need for replacement of an electrode which successively forms through holes in a workpiece by electrodischarge machining, comprising:
an electrode length detecting part for detecting a residual length of the electrode; an electrodischarge start position detecting part for detecting a position of the electrode at the time of start of electrodischarge as an electrodischarge start position; a penetration position detecting part for detecting a position of the electrode at the time of penetration through the workpiece as a penetration position; a required length setting part for using a difference between the electrodischarge start position which is detected by the electrodischarge start position detecting part and the penetration position which is detected by the penetration position detecting part as the basis to set a required length of the electrode which is required for machining the next through hole; and a judging part for comparing the residual length which is detected by the electrode length detecting part and the required length which is set by the required length setting part to judge the need for electrode replacement.