Why Aerospace Needs EDM
Aerospace components are made from materials specifically chosen because they're difficult to machine: titanium alloys, nickel superalloys (Inconel), hardened tool steels, and tungsten carbide. These materials resist conventional cutting tools but respond well to electrical discharge machining.
EDM advantages for aerospace:
- No cutting forces (zero mechanical stress on the part)
- Machines any electrically conductive material regardless of hardness
- Achieves tight tolerances (± 0.005 mm) without distortion
- Produces complex geometries impossible with conventional machining
- No tool wear in the traditional sense
Common Aerospace EDM Applications
Wire Cut EDM
- Turbine disk slots (fir-tree profiles)
- Compressor blade profiles
- Landing gear components
- Structural brackets with complex contours
- Test specimen cutting
Sinker EDM
- Turbine blade root forms
- Impeller cavities
- Fuel system components
- Complex internal features
EDM Drill
- Turbine blade cooling holes (hundreds per blade)
- Film cooling holes
- Fuel injector nozzles
- Start holes for wire EDM
Material Considerations
| Material | EDM Suitability | Notes |
|---|---|---|
| Ti-6Al-4V | Excellent | No thermal distortion, no work hardening |
| Inconel 718 | Excellent | EDM unaffected by material hardness |
| Hardened steel (60+ HRC) | Excellent | Cuts same as soft steel |
| Tungsten carbide | Good | Slower due to high melting point |
| Aluminium alloys | Fair | Fast cutting but higher wire breakage risk |
Quality Requirements (AS9100)
Aerospace EDM operations typically require:
- Process qualification — Documented proof the process meets requirements
- Recast layer control — Maximum acceptable recast layer thickness
- Surface integrity — No micro-cracking or thermal damage
- Traceability — Full material and process documentation
- Operator certification — Trained and qualified personnel
Berlin machines are used by multiple AS9100-certified aerospace manufacturers across India. Our application engineers can guide you through the qualification process for aerospace EDM operations.
Getting Started
If you're entering the aerospace supply chain or expanding aerospace capabilities:
- Invest in machines with proven accuracy and repeatability
- Establish documented EDM procedures
- Qualify your processes to customer specifications
- Maintain strict quality records
- Partner with a machine supplier who understands aerospace requirements
Berlin Machineries supports aerospace manufacturers from machine selection through process qualification. Contact our aerospace applications team for guidance.