final pm singh (edm) presentation
TRANSCRIPT
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EDM( Electric Discharge Machining )
Prakash Mohan Singh
Mech. Engg. 3rd year
2810440002
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EDM - Electrical Discharge Machining is a process of metal removalby means of energy release by repetitive spark discharges. theseelectrical discharges occur between an electrode (Cutting Tool) and anelectro-conductive workpiece and minute particles are eroded fromboth electrode and workpiece.
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INTRODUCTION
Electrical discharge machining die sinking has proved
valuable in the machining of super tough, electrically conductive
materials, such as the new space-age alloys. These metals would
have been difficult to machine by conventional methods. EDM has
made it relatively simple to machine intricate shapes that would be
impossible to produce with conventional cutting tools. This process
is continually finding more applications in the metal-cutting industry.
It is used extensively in the plastics industry to produce cavities of
almost any shape in the steel molds.
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Discharge gap
Metal sticks
The metal of both endsbecomes powder andprecipitate
The circuit for making metallic powder in the referencepublished in Germany in 1919 is indicated.
HISTORY OF EDM
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Transistorized circuit EDM
Servomechanism
Control circuit
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Gap controller
Electrode
Workpiece
EDMcircuit by Lazarenko (RC circuit)
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PRINCIPLE OF EDM
Electrical discharge machining is a controlled metal removaltechnique whereby an electric spark is used to cut (erode) theworkpiece, which takes a shape opposite to that of the cutting toolor electrode.The cutting tool (electrode) is made from electrically
conductive material, usually carbon. The die sinking electrode,made to the shape of the cavity required, and the workpiece areboth submerged in a dielectric fluid, (a light lubricating oil). Thisdielectric fluid should be a nonconductor (or poor conductor) ofelectricity.
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VARIOUS TYPES OF ELECTRICDISCHARGE MACHINES-
Electrode
Workpiece
a. Wire EDM
In wire EDM, the spark jumps from the wire electrode to theworkpiece and erodes metal both from the wire electrode and theworkpiece.
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b. Ram EDM
Workpiece
Electrode
generally used to produce blind cavities
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c. Small Hole EDM Drilling
Also known as fast hole EDM drilling or hole popper
Uses a hollow electrode to drill holes by means of electricaldischarge machining by eroding material from the workpiece
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Materials that can be EDMed
Inconel
Aluminum
Vasconal 300
Tool Steels: 01, A2, D2, S7 Aluminum Bronze PCD DiamondCarbide Copper Nitronic
Ferro-Tic Brass Beryllium CopperCPM 10V Cold Roll Steel Hastalloy4130 Hot Rolled Steel StelliteGraphite Stainless Steels Titanium
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SAFETY
a. Check that the workpiece has been set in a proper way.
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b. Check that the electrode has been set securely.
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c. Check that there is no abnormality in the discharge cable.
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d. flashing
EDMing with flushing alone must be avoided
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e. If a metallic injection nozzle is used, make sure that it will
not come into contact with the electrode.
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f. Make sure that the table travel will not cause any interference
with the nozzle.
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g. Check that the fluid level has been set properly.
Set the dielectric fluid level at not less than 50mm above the
top of the workpiece.
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APPLICATION
EDM product
widely used by the mould-making tool and die industries
Especially in the aerospace, automobile and electronics industries
Dies for producing jewelry and badges by the coinage (stamping)process
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ADVANTAGES
Complex shapes that would otherwise be difficult toproduce with conventional cutting tools
Extremely hard material to very close tolerances
There is no direct contact between tool and work
piece. Therefore delicate sections and weakmaterials can be machined without any distortion
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DISADVANTAGES
The slow rate of material removal.
The additional time and cost used for creatingelectrodes for ram/sinker EDM
Reproducing sharp corners on the workpiece isdifficult due to electrode wear
Specific power consumption is very high
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REFERENCES
Manufacturing technology by P.C.Sharma.
Exploring advanced manufacturing
technologies by By Stephen F. Krar, Arthur Gill.
Manufacturing Technology by B.L.Raghuvansi.
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THANK YOU