Pengenalan EDM

INTRODUCTION TO "ELECTRICAL DISCHARGE MACHINING" (EDM)

Have you heard about the term of "Electrical Discharge Machining" (EDM) before? Here are some explanation that might help u understand more about EDM.

Basically, Electro Discharge Machining (EDM) is an electro-thermal non-traditional machining process, where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark.

EDM is mainly used to machine difficult-to-machine materials and high strength temperature resistant alloys. EDM can be used to machine difficult geometries in small batches or even on job-shop basis. Work material to be machined by EDM has to be electrically conductive.

Electrical Discharge Machine (EDM) is now become the most important accepted technologies in manufacturing industries since many complex 3D shapes can be machined using a simple shaped tool electrode.

Electrical discharge machine (EDM) is an important ‘non-traditional manufacturing method’, developed in the late 1940s and has been accepted worldwide as a standard processing manufacture of forming tools to produce plastics moldings, die castings, forging dies and etc. New developments in the field of material science have led to new engineering metallic materials, composite materials, and high tech ceramics, having good mechanical properties and thermal characteristics as well as sufficient electrical conductivity so that they can readily be machined by spark erosion.

At the present time, Electrical discharge machine (EDM) is a widespread technique used in industry for highprecision machining of all types of conductive materials such as: metals, metallic
alloys, graphite, or even some ceramic materials, of whatsoever hardness.

Electrical discharge machine (EDM) technology is increasingly being used in tool, die and
mould making industries, for machining of heat treated tool steels and advanced
materials (super alloys, ceramics, and metal matrix composites) requiring high
precision, complex shapes and high surface finish.

Traditional machining technique is often based on the material removal using tool material harder then the work material and is unable to machine them economically. An electrical discharge machining (EDM) is based on the eroding effect of an electric spark on both the electrodes used.

Electrical discharge machining (EDM) actually is a process of utilizing the removal phenomenon of electrical-discharge in dielectric. Therefore, the electrode plays an important role, which affects the material removal rate and the tool wear rate.