Wire EDM Corner Path Correction via Endpoint Extension
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Solution Overview
Problem
Existing wire electrical discharge machining techniques fail to accurately correct machining paths in concave and convex corners, leading to shape inaccuracies, defects, and increased machining time, particularly when dealing with corners of arbitrary angles or those accompanied by arc blocks.
Innovation Solution
A method for creating a machining path that corrects the deflection of the wire electrode by extending the end point of the first block by the deflection amount and returning to the original path, allowing the wire electrode to accurately reach the corner vertex without deceleration, thereby reducing machining time and avoiding defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the wire electrode deflection is not corrected in corner portions, then the machining process is simple, but shape accuracy deteriorates due to corner droop
Solution Approach 1:
The machining path is corrected in advance by calculating and extending the first block's endpoint beyond the corner vertex by the deflection amount. This preliminary path adjustment ensures the wire electrode naturally reaches the correct position after deflection without requiring real-time correction or complex control systems during machining.
Solution Approach 2:
The path correction is applied locally only to corner portions by extending specifically the first block's endpoint in the corner area, while leaving the rest of the machining path unchanged. This localized approach improves corner accuracy without unnecessarily complicating the overall machining system.
2Manufacturing precision
If conventional path correction methods are applied to concave corners, then corner accuracy improves, but the wire electrode bites into the machined surface producing flaws
Solution Approach 1:
Instead of reducing the first block's endpoint (conventional approach), the invention extends it beyond the corner vertex by the deflection amount. This inverted approach accounts for the wire's natural deflection behavior, allowing it to reach the correct position without biting into the workpiece in concave corners.
Solution Approach 2:
The endpoint extension amount is dynamically adjusted based on the deflection amount parameter, which varies with machining conditions such as wire tension, machining speed, and corner geometry. This parameter-based correction optimizes accuracy while preventing wire biting.
3Manufacturing precision
If the wire electrode is decelerated to reach the corner vertex accurately, then shape accuracy improves, but machining time increases
Solution Approach 1:
The path correction is performed in advance by extending the programmed endpoint, allowing the wire electrode to maintain constant speed throughout machining. The wire naturally reaches the correct corner vertex position after deflection without requiring deceleration or speed adjustment, thus maintaining high productivity.
4Manufacturing precision
If the wire electrode deflection is reduced by controlling machining fluid or energy, then corner accuracy improves, but machining time increases
Solution Approach 1:
The invention replaces mechanical/process control methods (machining fluid flow control, energy control, speed reduction) with a computational approach. By calculating and extending the path endpoint based on deflection characteristics, the system achieves corner accuracy without modifying machining parameters or extending machining time.
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 effectively reduces machining time and improves shape accuracy in both concave and convex corners, including those with arc blocks, by precisely correcting the wire electrode's path and minimizing the risk of electrical discharge concentration and product damage.
Implementation Method 1
a wire electrode deflects due to a discharge repulsion force produced between wire electrode and workpiece
Implementation Method 2
a wire electrode deflects due to a discharge repulsion force produced between wire electrode and workpiece or due to turbulence of a machining fluid
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
In a corner portion formed at an intersection of a first block to be machined first and a second block to be machined second, an end point of the first block is extended. Then, after moving from the first block to the extended end point of the first block, a wire electrode of an electrical discharge machine returns to an end point of the original block (an end point of the original first block and a start point of the original second block) therefrom along the same path as before, and machines the second block therefrom.