Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). Material is removed from the work piece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is called the workpiece-electrode, or work piece. The process depends upon the tool and work piece not making physical contact.
When the voltage between the two electrodes is increased, the intensity of the electric field in the volume between the electrodes becomes greater, causing dielectric break down of the liquid, and produces an electric arc. As a result, material is removed from the electrodes. Once the current stops (or is stopped, depending on the type of generator), new liquid dielectric is conveyed into the inter-electrode volume, enabling the solid particles (debris) to be carried away and the insulating properties of the dielectric to be restored. Adding new liquid dielectric in the inter-electrode volume is commonly referred to as flushing. After a current flow, the voltage between the electrodes is restored to what it was before the breakdown, so that a new liquid dielectric breakdown can occur to repeat the cycle
Tool damage, finishing problem, cutting oil damage
Magnetic Filtration Benefits
1-EDM machining is expected to grow to be a $6 billion industry by 2027
2-By using a magnetic filter in conjunction with the traditional spun or fleece polyester or pleated paper barrier filter, fluid benefit from the highest level of protection.
3-The low-cost Micromag EDM filter offers a rapid return on investment often within just weeks of install.
4-Improved machine cutting speed of 17-30%
5-Reduces wire breakages
6-Saves 2000 machine hours per year