Electric Discharge Machining EDM

Because rhenium is very difficult to machine with carbide tools and other conventional methods, electrical-discharge machining (EDM), electrochemical machining (ROM), abrasive cutting, or grinding is... 

Ultrasonic machining (USM) is also of particular importance when very hard type materials are to be cut. As an assist to drilling, HDM energy can extend the drill life when producing holes in reinforced plastics. If the plastic is conductive, electrical discharge machining (EDM) or electrochemical machining (ECM) may be useful. 

Micro electrical discharge machining (EDM) is primarily used for hard metals and other electrically conductive materials. When two electrodes separated by a dielectric medium come close, the dielectrical medium breaks down and suddenly becomes conductive. Sparks generated between the electrodes release energy and remove metal by melting and evaporation [30], Murali and Yeo combined micro electro-discharge machining with ultrasound electrode vibration for improved surface quality, and achieved micro features as small as 25 pm on titanium with 20 pm diameter electrodes [30]. 

Setting up and operating machine tools (lathe, toolmaker s milling machine, surface grinder, cylindrical grinder electrical discharge machine-EDM) to make a variety of precision metal components. 

In some instances, electric discharge machining (EDM) is used. After one face is finished, it is used as the electrode to finish the matching surface. This, too, is slow, expensive, and not always possible. 

Electric discharge machining (EDM) is defined as the removal of material by electric discharges between two electrodes (workpiece and tool) in a dielectric fluid. The material removal takes place by non-stationary electric discharges (sparks) which are separated from each other both spatially and temporally (CIRP Dictionary 2004). 

The advent of the tool and die maker and the increased sophistication of the chip-making and/or Electrical Discharge Machining (EDM) equipment available for making close, closer, and closest tolerance tooling required the press manufacturer to improve the press structures and integrity of the machine itself to guide the tools to make satisfactory parts. 

With these processes, silicon nitride can be produced to near-net shape, often within 1%. If closer dimensional tolerances are required, the material can be diamond ground. If the silicon nitride is alloyed with a small amount of titanium nitride, it acquires sufficient electrical conductivity to allow electrical discharge machining (EDM). 

Electrical discharge machining. (EDM) is also commonly performed on molybdenum and its alloys. Care must be exercised when EDMing molybdenum and its alloys because the surface zone frequently contains a resohdified layer. This structure is susceptible to microcracking and should be removed by mechanical or chemical poHshing prior to using the part. 

Fins in the silicon are fabricated in a variety of ways. Argonne National Laboratory uses electrical discharge machining (EDM). MESA+ Research Institute, University of Twente, The Netherlands, uses a KOH etch of the silicon to form the channels [33]. Others use an anisotropical etch of KOH... 

Electrodes for lighting, electrical-discharge machining (EDM), and electric-arc furnaces... 

They have good corrosion resistance. Therefore, one can do without expensive surface treatments. However, it is possihie to chrome plate, nickel plate, or hard anodize aluminum plates after machining (electrical discharge machining [EDM]). 

---