Wire cut electric discharge machine with machining state discrimination function

Abstract

The invention provides a wire cut electric discharge machine with a machining state discrimination function. In a wire cut electric discharge machine, based on a voltage applied to a machining gap between a workpiece and a wire electrode, machining states are classified into at least three states of ''open'', ''discharge'', and ''short'' for each voltage application, and state discrimination signals corresponding to the respective states are respectively counted. Based on the counting results, an increase of a discharge gap, a reduction in a machining gap, retention of machining sludge, and so on are determined as machining states.

Description

technical field [0001] The invention relates to a wire-cut electric discharge machine, in particular to a wire-cut electric discharge machine with a processing state judgment function. Background technique [0002] In electrical discharge machining, an arc discharge is generated by applying a voltage to an electrode and workpiece in a machining fluid. While the workpiece is melted by the heat of the discharge, the machining fluid is rapidly heated to cause gasification and explosion, and the melted workpiece is blown away. The workpiece is processed by repeating the above operations at high frequency. In addition, the small discharge traces generated by discharge gather together to form the processed surface, so the surface roughness is determined by the size of each discharge trace. [0003] As a type of electrical discharge machining, wire-cut electrical discharge machining is known in which an AC high-frequency voltage is applied as an output voltage of a power supply b...

AI Technical Summary

Problems solved by technology

Although the number of discharges is an index that is less affected by disturbances such as the density of machining chips and the resistivity of machining fluid than the average voltage, it is difficult to detect discharges at high AC frequencies and cannot be used in the field of finishing.

[0011] As mentioned above, when machining with AC high-frequency voltage in an electric discharge machine, it is difficult to judge the machining state in detail, and there is still a lot of room for improvement in terms of machining accuracy.

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