31-07-2017, 10:09 PM
I am doing project on edm so I need for reference
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edm project and ppt downloding
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I am doing project on edm so I need for reference
02-08-2017, 11:55 AM
This process is also known as Electro-Discharge Machining / Electro / Electro Spark Machining Erosion Process. In this method work and the workpiece (acting as electrodes) are separated by a certain space filled with a dielectric medium. A preset pulse across the workpiece and work. Depending on the micro irregularities of the tool surfaces and workpieces and the presence of carbon and metal particles, the dielectric decomposes at several points producing ionized columns that allow a focused electron stream to flow and produce Compression shock, In local temperatures. Due to the combined effect of these two metal particles are ejected very similar to the boiling out of the water. As erosion progresses, the gap changes and that gap is continuously maintained by servomechanism. This process incorporates two unique features viz.
1. Absence of any cutting force between the tool and the workpiece.
2. Absence of any effect of hardness of the workpiece on the cutting action.
These characteristics allow this process to be used in the production of thin slots or micro drills in thin and delicate parts such as electrical and electronic equipment. The EDM process is effective in the machining of electrically conductive but extremely fragile material. In machining of super hard materials such as cemented carbide, in removing broken drills, faucets, etc. In addition to being unique in previous applications this process can replace the conventional extra laborious die cavity production methods. Since the shape of the cavity that is eroded corresponds to the shape of the tool, this process is very convenient and economical for various row sinking applications.
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