Micro EDM Milling with Low Energy Discharges and Thin Microtool

Rabah Dahmani (1) , Yasmina Layouni (1) , Vincent Semet (1) , Michel Cabrera (1)

1 INL - LOCI - INL - Lab-On-Chip et Instrumentation

The aim of this paper is to report on micro EDM milling of stainless steel with ultrathin and high aspect ratio microtools and explore possibilities for machining with small discharges using a ballast resistor. Machining of channels is demonstrated with a 9 µm tungsten microtool with 29 nJ/discharge without damaging the tool. Depending on the value of the ballast resistor Rb, the channel width is about 31-36 µm with aspect ratio of 1.4-1.8. The most significant result is that the relative tool wear ratio is below 0.01% when Rb is greater than 100 Ω. It allows machining at 50 V operating voltage with 1 nF working capacitance without using the stray capacitance of the machine.

Mots clés: Tool wear; Microtool; Micro EDM milling; Micro EDM; Stainless steel

Domaines: Sciences de l'ingénieur [physics]

Rabah Dahmani, Yasmina Layouni, Vincent Semet, Michel Cabrera. Micro EDM Milling with Low Energy Discharges and Thin Microtool. 4M/ICOMM2015 Conference, Mar 2015, Milan, Italy. ⟨hal-01306795⟩