Wire EDM Non-Discharge Pulse Feedback for Breakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wire electrical discharge machines face issues with wire electrode breakage due to unclear definitions of normal and abnormal discharge states, leading to inefficient reduction of breakage.
Innovation Solution
A wire electrical discharge machine equipped with a pulse detection unit, instability calculation unit, and machining condition changing unit that detects voltage pulses, calculates the degree of instability using non-discharge pulses, and adjusts machining conditions to reduce wire electrode breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight coefficients are pre-defined for normal and abnormal discharge pulses to calculate energy evaluation data, then wire breakage can be reduced by comparing energy evaluation data with threshold, but the definitions of normal discharge state and abnormal discharge state remain unclear
Solution Approach 1:
The invention changes the parameter used for discharge state evaluation from pre-defined weight coefficients based on unclear normal/abnormal classifications to a clear quantitative parameter: the number of non-discharge pulses detected per unit time. This provides an objective, measurable criterion for determining discharge state instability that directly triggers machining condition adjustments.
Solution Approach 2:
The invention replaces the subjective classification system (normal vs. abnormal discharge states with pre-defined weight coefficients) with an objective detection system that counts non-discharge pulses. This substitution eliminates the ambiguity of discharge state definitions by using a clear, quantifiable metric that can be directly measured and acted upon.
2Reliability
If the off time of voltage pulses is increased to reduce wire breakage, then wire electrode reliability improves, but machining productivity decreases
Solution Approach 1:
The invention makes the off time dynamic rather than fixed. The off time is adjusted in real-time based on the detected number of non-discharge pulses: when instability is detected (high number of non-discharge pulses), the off time is increased to prevent breakage; when stability is confirmed (low number of non-discharge pulses), the off time returns to normal to maintain productivity. This dynamic adjustment resolves the contradiction between reliability and productivity.
Solution Approach 2:
The invention introduces a feedback mechanism where the detected number of non-discharge pulses continuously monitors discharge state stability and feeds back to adjust the off time. This closed-loop control ensures that off time increases only when necessary to prevent wire breakage, rather than being constantly increased, thereby maintaining high productivity during stable operation while protecting against breakage during unstable conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces wire electrode breakage by dynamically changing machining conditions based on the calculated instability, thereby enhancing the reliability of the electrical discharge machining process.
Implementation Method 1
a pulse detection unit configured to detect pulses of voltage repeatedly applied between the workpiece and the wire electrode
Implementation Method 2
an instability calculation unit configured to calculate the degree of instability indicating how unstable the discharge state is, by using the number of non-discharge pulses that present no voltage drop due to the electrical discharge
Implementation Method 3
a machining condition changing unit configured to change a machining condition for the workpiece, based on the calculated degree of instability
Implementation Method 4
generating electrical discharge at an electrode gap formed between the workpiece and the wire electrode
Implementation Method 5
apply a voltage between a workpiece to be machined and a wire electrode to generate electrical discharge
Data Source
AI summary
A wire electrical discharge machine includes: a pulse detection unit configured to detect voltage pulses repeatedly applied between a workpiece and a wire electrode; an instability calculation unit configured to calculate the degree of instability indicating how unstable the discharge state is, by using the number of non-discharge pulses that present no voltage drop due to electrical discharge, among the pulses detected per unit time by a pulse detection unit; and a machining condition changing unit configured to change a machining condition for the workpiece, based on the calculated degree of instability.