EDM Power Supply Control for Adaptive Abnormal Pulse Detection
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Solution Overview
Problem
The existing power supply control apparatus for electric discharge machines relies on a constant reference value to determine normal or abnormal discharge pulses, which can lead to inappropriate suspension times and decreased machining speed due to incorrect identification of abnormal pulses.
Innovation Solution
A power supply control apparatus that includes a voltage level detecting unit, a voltage level comparator, and a determining unit capable of designating multiple determination modes to assess discharge pulses based on cumulative time or delay times, allowing for dynamic adjustment of reference values and reducing abnormal discharge occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant reference value is used to determine abnormal discharge pulses, then the abnormal discharge can be controlled, but the machining speed decreases due to excessive suspension time extension
Solution Approach 1:
The patent applies dynamics by making the reference value dynamic instead of constant. The reference value changes based on the cumulative time of abnormal discharge pulses, allowing the system to adapt to different machining states. This resolves the contradiction by enabling effective abnormal discharge control while avoiding excessive suspension time extension that would reduce machining speed.
Solution Approach 2:
The patent implements parameter changes by modifying the reference value parameter based on the cumulative time of abnormal discharge pulses. When the cumulative time exceeds a threshold, the reference value is adjusted, which changes the sensitivity of abnormal discharge detection. This allows the system to maintain high machining speed while still effectively controlling abnormal discharge.
2Reliability
If the suspension time is extended to reduce abnormal discharge, then the abnormal discharge is controlled, but the machining speed decreases
Solution Approach 1:
The patent makes the suspension time dynamic by linking it to the cumulative time of abnormal discharge pulses. The suspension time is extended only when the cumulative time exceeds a threshold, rather than being constantly extended. This resolves the contradiction by minimizing unnecessary time loss while maintaining effective abnormal discharge control.
Solution Approach 2:
The patent changes the suspension time parameter based on the cumulative time of abnormal discharge pulses. When the cumulative time is within an acceptable range, the suspension time remains short to maintain high machining speed. When the cumulative time exceeds the threshold, the suspension time is extended to control abnormal discharge, thus optimizing the balance between reliability and time efficiency.
3Reliability
If the reference value is set to be sensitive to detect abnormal pulses, then abnormal discharge can be controlled, but normal pulses may be incorrectly identified as abnormal
Solution Approach 1:
The patent applies dynamics by making the reference value adaptive rather than fixed. The reference value evolves based on the cumulative time of abnormal discharge pulses, allowing the system to learn the normal discharge characteristics during machining. This resolves the contradiction by reducing false identification of normal pulses while maintaining sensitivity to detect actual abnormal discharge, thereby preserving machining speed.
Solution Approach 2:
The patent implements feedback by using the cumulative time of abnormal discharge pulses to adjust the reference value. This feedback mechanism allows the system to continuously optimize its detection accuracy based on actual machining conditions. The reference value is adjusted only when necessary, preventing false identification of normal pulses while maintaining effective abnormal discharge control, thus avoiding unnecessary suspension time extension.
Data Source
AI summary
The present invention is a power supply control apparatus that controls pulse discharge occurring in a machining gap in an electric discharge machine. The power supply control apparatus includes: a voltage level detecting device that detects the voltage level of a discharge voltage generated in the machining gap; a voltage level comparator hat compares the voltage level with a voltage level reference value, and outputs a comparison result; and a determining unit that, on the basis of the comparison result, determines whether a discharge pulse is abnormal in a designated one of a plurality of determination modes. The determination method can be designated during machining.