The Advantages of Tungsten Carbide EDM Bocks

Since the traditional machining methods have reached a peak in their functionalities, the time soon came for EDM to provide an easier and convenient solution. Instead of the traditional methods, the EDM process allows for high precision and accuracy to be applied for any conductive material being manufactured, meanwhile also saving the stress of applying mechanical force on the workpiece.

What is principal of EDM?

EDM stands for Electrical Discharge Machining. It is a manufacturing process whereby a metal workpiece that is to undergo machining is clamped directly into a machining bed. This non-traditional method of machining allows materials to be removed from a workpiece by the application of thermal energy. Just like laser cutting, EDM does not depend on any form of mechanical energy to remove these materials, hence the reason it is more preferred by professional firms.

How Does EDM Work?

The EDM uses electrodes to remove the material from conductive materials. When considering the physical process, it is a little more complicated. A small gap exists between the workpiece and the electrode which is roughly as thick as a human hair. During EDM, a discharge of the material being removed occurs either by melting or vaporizing.

The electrode is closely moved to the workpiece and the electric field between the two materials also known as the “Spark Gap” will continue to increase until the breakdown volume is reached, and the discharge begins. The discharge medium is kept dielectric (material that does not explicitly conduct electricity but allows electrons to jump within it). This is because the discharge will cause strong heating of the workpiece before melting away the small amounts of materials that needed to be removed.

The dielectric fluid, therefore, removes excess material through its movement, cools the set-up during machining, and is also necessary for controlling the sparks. The basic principle behind this whole process lies in the ability of electric sparks to be harnessed for eroding materials.

Application Of Electric Discharge Machining (EDM)

The EDM process is very common in tool and mold-making because it has a lot of applicability for various materials, especially those that are hard to machine with milling. The process is most suitable for creating hardened alloy tooling that is needed for the manufacturing processes because its regardless of the hardness of the material. It is adopted to machine alloys that are difficult for the traditional machining methods to handle.

Mold tooling, extrusions, and stamping require the use of hardened alloys which are produced using EDM. Holes can also be drilled through a curved surface with precision because EDM does not use any mechanical force. There are also few cases whereby electrodes can be rotated or dragged along curved pathways during different manufacturing processes in such a way that might not be possible with other processes such as CNC Machining.