What is die sinking EDM?

Sinker EDM, also called ram EDM, cavity type EDM or volume EDM, consists of an electrode and workpiece submerged in an insulating liquid such as, more typically, oil or, less frequently, other dielectric fluids. The electrode and workpiece are connected to a suitable power supply.

What is the principle of EDM?

5.2 Principles of the EDM process. EDM is a thermoelectric process used to remove metal via a series of discrete sparks between the metal and workpiece. In EDM an electric spark is used as the cutting tool to cut (erode) the workpiece and produce the finished part to the required shape.

How does sinker EDM work?

Sinker EDM machines use an electrode and workpiece submerged in liquids such as oil or dielectric water. A power supply is connected to the electrode and generates electrical potential between both of the parts, producing a breakdown to form a plasma channel and spark jumps.

What are the application of EDM?

EDM is also known as spark machining, wire burning or wire erosion. It is a manufacturing process where desired shape is obtained by using electrical discharges. EDM used for machining hard material, which is electrical conductor. The work place and tool are separated by gap called spark gap.

What is the purpose of die sinking EDM?

Die sinking EDM (also called conventional EDM) employed a tool electrode having a profile matching with the intended shape. The electrode usually has a larger face. It is used to impart multifarious blind shapes and surface curvatures.

What kind of fluid is used for die sinking?

Suitable dielectric fluid (like deionized water, kerosene) is applied in both the cases to assist spark generation and debris removal. Presence of suitable potential difference between tool electrode (cathode) and workpiece (anode) is indispensably necessary for breakdown of dielectric fluid.

How did b.r.lazarenko prevent the erosion of tungsten contacts?

Two Russian scientists, B. R. Lazarenko and N. I. Lazarenko, were tasked in 1943 to investigate ways of preventing the erosion of tungsten electrical contacts due to sparking. They failed in this task but found that the erosion was more precisely controlled if the electrodes were immersed in a dielectric fluid.

When does the erosive effect of electrical discharge occur?

Also, after a current flow, the difference of potential between the electrodes is restored to what it was before the breakdown, so that a new liquid dielectric breakdown can occur. The erosive effect of electrical discharges was first noted in 1770 by English physicist Joseph Priestley.