Used machine tools
Among the different machining processes, the electroerosion
technique relies on the action of an electrode on the workpiece to be machined. The electrode generates electrical discharges accompanied by sparks and the particles are thus very locally deteriorated via the implosion of vacuum ionized bubbles produced by the current flow.
There are different types of machines used to realize machining operations relevant to this category which is the electroerosion. We can cite, among them, wire electroerosion, hobbing electroerosion, and what is of concern to us hereto, fast drilling electroerosion.
The fast drilling electroerosion machines use, therefore; the same principle of deterioration of the material through a passage of current via an electrode, but this latter is tubular or bar-shaped.
Fast drilling electroerosion allows drilling very hard conductive materials. The machines designed to this effect are used to realize, with high precision, very small diameter holes on the workpieces to be machined.
On the majority of fast drilling electroerosion
machines models, the generator of the machine produces sparks and is in charge of advance control. Such equipments provide an excellent drilling quality and have the advantage of limiting the thermally disturbed layer.
Furthermore, the operations being carried out into the dielectric, the workpieces do not undergo oxidation.
Consequently, the EDM driller
machines equipped with a digital control (CNC) allow the automation of a large series of drilling.
Many copies of fast drilling electroerosion machines are available on the second-hand market. But to offer a quality level close to that of new machinery and an optimum quality of operation, these machines must be checked in every tiny detail by teams having the necessary knowledge for such checking operations, such as those who work for RDMO workshops.
Today, the major manufacturers of EDM driller are AGIE, Castek, Charmilles
, or Selga-Viollet.