Wire EDM Gap Control Using Speed-Based Voltage Compensation
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Solution Overview
Problem
The machining accuracy of workpieces in wire electrical discharge machines decreases as the difference between the machining speed and setting speed increases, due to a weaker correlation between speed differences and side gaps.
Innovation Solution
A wire electrical discharge machine with a discharge state value acquisition unit, compensation unit, driving unit, and control unit that maintains a constant inter-electrode gap by compensating discharge state values based on machining speed using equations that relate discharge state values to machining speed, ensuring precise control of the wire electrode's movement relative to the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linear compensation of discharge state values is used based on machining speed, then control simplicity is maintained, but machining accuracy deteriorates when the difference between machining speed and setting speed becomes large
Solution Approach 1:
The patent changes the compensation parameter from linear to exponential relationship. Specifically, it uses the exponential function y=a×exp(b×x) where x is the machining speed and y is the compensated discharge state value, allowing the compensation amount to increase exponentially with speed difference rather than linearly, thus maintaining accuracy at high speed differences
Solution Approach 2:
The patent implements dynamic compensation by adjusting the discharge state value based on the actual machining speed in real-time. The compensation value is calculated dynamically using the exponential relationship between machining speed and discharge state, allowing the system to adapt to varying speed conditions rather than using fixed linear compensation
2Productivity
If the machining speed differs significantly from the setting speed, then productivity can be increased, but the correlation between speed difference and side gap weakens, causing machining accuracy to decrease
Solution Approach 1:
The patent transforms the compensation parameter from linear to exponential relationship. Specifically, it uses the exponential function y=a×exp(b×x) where x is the machining speed and y is the compensated discharge state value, allowing the compensation amount to increase exponentially with speed difference rather than linearly, thus maintaining accuracy at high speed differences
Solution Approach 2:
The patent implements feedback control by continuously monitoring the machining speed and adjusting the discharge state value compensation accordingly. The system measures the actual machining speed, calculates the exponential compensation based on the speed difference, and applies this compensation to maintain constant inter-electrode gap, creating a closed-loop control system that adapts to speed variations
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
This approach improves machining accuracy by maintaining a consistent inter-electrode gap regardless of machining speed, enhancing the precision and reliability of the machining process.
Implementation Method 1
generating an electric discharge in an inter-electrode gap between a wire electrode and a workpiece
Data Source
AI summary
This wire electric discharge machine comprises: an average interelectrode voltage calculation unit which calculates an average interelectrode voltage between electrodes; a correction unit which determines a corrected average interelectrode voltage in accordance with the speed of machining performed on a workpiece by a wire electrode; and a motor control unit which keeps constant the magnitude of the distance between electrodes during machining, by controlling an X-axis motor and a Y-axis motor on the basis of the corrected average interelectrode voltage. The correction unit determines a corrected average interelectrode voltage according to a formula in which the average interelectrode voltage is expressed as a numerator and a value, obtained by using a coefficient as a base and the machining speed as an exponent, is expressed as a denominator.