Electric-discharge machining device

摘要

An electric-discharge machining device including an electric-discharge-state determination unit that determines whether an electric discharging state between a machining electrode and a workpiece is either a state of normal electric discharge or of abnormal electric discharge, and a machining-condition switching unit that changes at least one machining condition, further includes a storage unit that stores therein an electric-discharge-state determination indicator, a standard-deviation calculation unit, and a boundary calculation unit that calculates a boundary to be applied to a determination in the electric-discharge-state determination unit based on the electric-discharge-state determination indicator, wherein the machining-condition switching unit changes the machining condition according to a comparison result between the standard deviation calculated by the standard-deviation calculation unit and a standard deviation reference set as a reference of the standard deviation.

主权项

1. An electric-discharge machining device comprising:
an electric-discharge-state determination unit that makes a determination as to whether an electric discharging state between a machining electrode and a workpiece is either a state of normal electric discharge or a state of abnormal electric discharge; and a machining-condition switching unit that changes at least one machining condition in machining of the workpiece according to a determination result in the electric-discharge-state determination unit, wherein the electric-discharge machining device further comprises:
a storage unit that stores therein a state amount according to the electric discharging state as an electric-discharge-state determination indicator that is an indicator for determining the electric discharging state;a standard-deviation calculation unit that calculates a standard deviation of the electric-discharge-state determination indicator read from the storage unit; anda boundary calculation unit that calculates a boundary to be applied to the determination as to whether the electric discharging state is of the normal electric discharge or of the abnormal electric discharge made by the electric-discharge-state determination unit based on the electric-discharge-state determination indicator, and whereinin a preparation machining for calculating the boundary in the boundary calculation unit, the machining-condition switching unit changes the machining condition according to a comparison result between the standard deviation calculated by the standard-deviation calculation unit and a standard deviation reference set as a reference of the standard deviation, andwhen the standard deviation calculated by the standard-deviation calculation unit is smaller than the standard deviation reference, the boundary calculation unit calculates the boundary.