EDM Hole Drilling with Electrode Scanning for Depth Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical discharge drilling of holes in electroconductive materials, such as those used in aircraft turbomachines, faces challenges in accurately quantifying electrode wear and ensuring precise hole opening without risking adjacent wall impact, with existing solutions being complex and time-consuming.
Innovation Solution
A method involving the EDM electrode's dual function for drilling and scanning, where the electrode is laterally moved over a short distance to calculate the effective hole depth by measuring the difference in electrode positions during drilling and scanning, allowing for accurate determination of hole opening and optimizing drilling time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode is advanced further to ensure hole opening, then the hole opening reliability is improved, but the risk of impacting the opposite wall increases
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual hole depth during the drilling process and using this information to control the electrode advance. The system continuously monitors whether the hole has opened through by detecting electrical discharge signals, and automatically adjusts the electrode position accordingly. This closed-loop control ensures the hole opens reliably without over-advancing the electrode to the point of impacting the opposite wall.
Solution Approach 2:
The patent performs preliminary detection of hole opening status during the drilling process itself, before the electrode completes its full advance. By detecting electrical discharge signals that indicate hole opening, the system stops the electrode advance at the appropriate moment, preventing impact on the opposite wall while ensuring the hole has opened.
2Device complexity
If the electrode wear is not accurately quantified, then the drilling process is simpler, but the manufacturing precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical measurement systems for electrode wear quantification with an electrical detection method. By using electrical discharge signals during the drilling process to detect hole opening and calculate actual hole depth, the system achieves precise wear compensation without requiring separate mechanical measurement devices or complex wear sensing mechanisms.
Solution Approach 2:
The electrode itself serves the dual function of both drilling and self-measurement. The electrical discharge signals generated during normal drilling operations are used to detect hole opening and calculate the actual hole depth, allowing the electrode to provide its own wear information without requiring external measurement systems.
3Measurement precision
If complex detection methods are used to determine hole opening, then the measurement precision is improved, but the productivity deteriorates
Solution Approach 1:
The patent maintains continuous useful action by using the same electrical discharge mechanism for both material removal and hole opening detection. The detection process occurs continuously during the drilling operation without interrupting the material removal process, eliminating the need for separate detection steps and maintaining high productivity while achieving precise hole opening detection.
Solution Approach 2:
The patent merges the drilling function and the detection function into a single integrated process. The electrical discharge signals used for material removal also serve as the detection signal for hole opening. By combining these two functions into one process, the system achieves precise measurement without adding separate detection equipment or steps that would reduce productivity.
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 method enables precise determination of hole depth and opening, reducing the risk of adjacent wall impact and optimizing drilling efficiency, while avoiding complex detection methods, thus providing a simple and effective solution for electrical discharge drilling.
Implementation Method 1
The electro discharge drilling or EDM drilling (Electro Discharge Machining) is a machining method that removes material from a part using electro discharges
Implementation Method 2
The machining method consists of passing a current from an electrode to the part through a dielectric, in order to generate a 'bubble' of vapour or vacuum that ionises and reabsorbs by imploding, which destroying the material of the part
Data Source
AI summary
A method for electrical discharge drilling of a hole in a part made of electroconductive material, in particular for an aircraft turbomachine, the method using an electrical discharge machine including a head that can move relative to the part and has a consumable EDM electrode, which is of elongated shape and is translationally moved along its elongation axis, the method including the following steps: a) advancing the EDM electrode towards the part in order to drill a hole in the part; and b) retracting the EDM electrode and removing the EDM electrode from the hole, wherein it further includes the following steps: c) laterally moving the head; d) advancing the EDM electrode towards the part in order to scan for the part; e) computing the effective depth of the hole drilled in step a).