EDM by rattandeep singh

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Electrical Discharge Machining:

Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Electrical Discharge Machining

Introduction:

Introduction Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Electrical discharge machining is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. EDM typically works with materials that are electrically conductive, although methods for machining insulating ceramics with EDM have also been proposed. EDM can cut intricate contours or cavities in pre-hardened steel without the need for heat treatment to soften and re-harden them.

Electrical Discharge Machining:

Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Electrical Discharge Machining

Electrical discharge machining (EDM) :

Electrical discharge machining (EDM) Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Based on erosion of metals by spark discharges. EDM system consist of a tool (electrode) and work piece, connected to a dc power supply and placed in a dielectric fluid. when potential difference between tool and work piece is high, a transient spark discharges through the fluid, removing a small amount of metal from the work piece surface. This process is repeated with capacitor discharge rates of 50-500 kHz.

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Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com dielectric fluid – mineral oils, distilled water 1. acts as a insulator until the potential is sufficiently high. 2. acts as a flushing medium and carries away the debris. 3. also acts as a cooling medium. Electrodes – usually made of graphite. EDM can be used for die cavities, small diameter deep holes,turbine blades and various intricate shapes.

Principal of EDM:

Electrical discharge machining is a controlled metal removal technique whereby an electric spark is used to cut the WorKpiece, which takes a shape opposite to that of the cutting tool or 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 are both submerged in a dielectric fluid. This dielectric fluid should be a nonconductor (or poor conductor) of electricity. Principal of EDM Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

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SAFETY a. Check that the workpiece has been set in a proper way. Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

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b. Check that the electrode has been set securely. Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

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c. 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. Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

Advantages:

Advantages Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Complex shapes that would otherwise be difficult to produce with conventional cutting tools Extremely hard material to very close tolerances Very small work pieces where conventional cutting tools may damage the part from excess cutting tool pressure. There is no direct contact between tool and work piece. Therefore delicate sections and weak materials can be machined without any distortion. A good surface finish can be obtained. Very fine holes can be easily drilled.

Disadvantage:

Disadvantage Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com The slow rate of material removal. The additional time and cost used for creating electrodes for ram/sinker EDM. Reproducing sharp corners on the workpiece is difficult due to electrode wear. Specific power consumption is very high. Power consumption is high. "Overcut" is formed. Excessive tool wear occurs during machining.

Examples of EDM:

Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Examples of EDM

Electrode used:

Electrode used Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

Types:

Types Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com 1. Sinker EDM 2. Wire EDM

Sinker EDM:

Sinker EDM Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com Sinker EDM, also called 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. The power supply generates an electrical potential between the two parts.

Wire EDM:

Wire EDM Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com A thin single-strand metal wire, usually brass, is fed through the work piece, submerged in a tank of dielectric fluid, typically de ionized water. Wire-cut EDM is typically used to cut plates as thick as 300mm and to make punches, tools, and dies from hard metals that are difficult to machine with other methods.

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Applications:- Prototype production C oinage die making Small hole drilling Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com

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Rattandeep singh (Mechanical engg.)Email:-rsrattanvirdi@gmail.com THANK YOU!!!!!!!

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