EDM Pulse Triggering for Equidistant Discharge on Curved Paths
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Solution Overview
Problem
Existing electrical discharge machining (EDM) technologies face challenges in maintaining precision and efficiency when machining high-precision molds due to uneven discharge energy distribution, especially when transitioning from linear to non-linear paths, leading to errors in geometric shape and accuracy.
Innovation Solution
An electrical discharge machining equipment with equidistantly triggering discharge, utilizing a position processing unit and controller to generate processing signals for equal distribution of discharge pulses, and a discharge circuit module to alternate first and second discharge currents, ensuring consistent discharge energy along non-linear paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode moves along a non-linear path with dual-axis movement, then the machining capability is improved, but the feed rate decreases causing uneven discharge distribution and machining precision deterioration
Solution Approach 1:
The patent applies dynamics by making the discharge triggering mechanism adaptive to the instantaneous feed rate. The position processing unit continuously calculates the electrode's position and dynamically adjusts discharge triggering based on the actual feed rate, which varies during non-linear path movement. This dynamic adjustment ensures that discharge points remain equidistant regardless of the changing feed rate, resolving the contradiction between machining capability and precision.
Solution Approach 2:
The patent implements feedback through the position processing unit that continuously monitors the electrode's position and feed rate, and uses this information to control the discharge circuit module. The system feeds back the calculated feed rate information to adjust the discharge triggering timing, ensuring that discharge points are equidistantly distributed even when the feed rate changes during non-linear path machining, thereby maintaining machining precision.
2Productivity
If the discharge energy is continuously applied for a fixed duration, then the machining efficiency is improved, but the discharge points become overly dense or sparse causing geometric shape errors
Solution Approach 1:
The patent applies periodic action by controlling the discharge circuit module to generate discharge currents at regular intervals based on the calculated feed rate. Instead of continuous discharge, the system triggers discrete discharge pulses at equidistant intervals along the machining path. This periodic discharge action ensures that discharge points are uniformly distributed, preventing both over-density and sparsity, while maintaining machining efficiency through optimized pulse timing.
3Manufacturing precision
If the feed rate is reduced during non-linear path movement, then the machining precision can be maintained, but the productivity decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the discharge triggering parameters based on the instantaneous feed rate. The position processing unit calculates the feed rate in real-time and modifies the discharge triggering timing accordingly. This allows the system to maintain equidistant discharge point distribution (precision) while operating at optimal feed rates (productivity), as the discharge timing adapts to the actual movement speed without requiring a reduction in overall feed rate.
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 equipment ensures accurate and efficient machining by preventing over-concentration or dispersion of discharge energy, improving machining accuracy and efficiency by maintaining consistent discharge points, and includes a short circuit detection function to enhance operational reliability.
Implementation Method 1
The discharge circuit module includes a first discharge circuit for generating a first discharge current and a second discharge circuit for generating a second discharge current... the controller is configured to control the discharge circuit module to alternatively provide the first discharge current and the second discharge current to the electrode
Data Source
AI summary
An electrical discharge machining equipment with equidistantly triggering discharge includes an electrode, a position processing unit, a discharge circuit module, and a controller. The electrode moves along a process path to process a work piece. The position processing unit generates a processing signal when the moving distance matches up with the discharge triggering distance, and generates a plurality of processing signals according to the process path, the discharge triggering distance and the moving distance. The discharge circuit module includes a first discharge for generating a first discharge current and a second discharge circuit for generating a second discharge current. The controller controls the discharge circuit module to alternatively provide the first discharge current and the second discharge current to the electrode during the period of the discharging signal of the processing signal.