What is EDM machine working principle?
Electrical discharge Machining Working Principle
EDM spark erosion is the same as when an electric spark strikes a piece of metal and burns a small hole into it. This process generates heat which causes metal to be removed through erosion and evaporation.
What is wire tension in EDM?
Among all important process parameters of the WEDM the wire tension is an important parameter which affects the wire breakage during machining and the also affects the accuracy due to change in frequency of oscillation during sparking and pause.
How do you clean EDM wires?
Q: What are the best cleaners to maintain my wire EDM machine? A: We recommended a general all-purpose cleaner/degreaser (such as Simple Green). When more aggressive cleaners are required, use an acid cleaner designed for EDM, such as HYP-R2S, previously known as K200, which is a phosphoric acid-based chemical.
Why does the water in the EDM wire cut machine need to be filtered?
Wire-cut EDM creates microscopically small particles during the cutting process; removing these “chips” becomes a key factor in maximizing cutting speed and attaining part accuracy and surface finish.
Which dielectric fluid is used in EDM?
Hence, considering above mentioned properties commonly used dielectric fluids in EDM are hydrocarbon oil, e.g., transformer oil, paraffin oil, kerosene; lubricating oil, gas, air and also deionized water.
What are the basic components of EDM?
EDM system consists of four basic components tool electrode and work piece, pulsed power supply system, dielectric supply system and electrode feeding system which are shown in Fig.
What are high tension wires?
A high tension wire has a low resistance and large surface area. Instead of making a single thick wire of low resistance, it is made by twisting together a number of thin wires insulated from each other so as to provide a large surface area so that it can radiate heat more easily.
What is the meaning of wire-cut?
Definition of wire-cut
: cut or shaped by or as if by a taut wire wire-cut brick wire-cut tile — compare molded brick sense 1.
What is EDM in maintenance?
What is EDM? EDM stands for electrical discharge machining. This refers to a manufacturing process that uses electrical discharges to create the desired outcome or shape of a material. Some of these processes include spark machining, wire burning, wire erosion, spark eroding and burning, among others.
How long do EDM machines last?
The machines of today are engineered to last into the 25-year and longer range.
Why dielectric fluid is used in EDM?
Dielectric is an important parameter in EDM and plays a crucial role in determining high material removal rate (MRR) and surface finish during operation. The dielectric fluid behave as a medium which controls the electrical discharge and absorb heat during process.
Why deionized water is used in wire EDM?
Deionized water has been used as dielectric fluid for micro-electrical discharge machining (micro-EDM) because it gives higher material removal rate and lower tool wear than hydrocarbon oil. Moreover, it is a relatively low-cost and eco-friendly substance.
Which tool is used in EDM?
Aluminum, brass, ceramics, graphite, semiconductors, silver, steel, superalloys are the generally used tool material in EDM. The most commonly used dielectrics are de-ionized water, kerosene, paraffin, and transformer oil. The operating parameters of EDM are divided into two types electrical and non-electrical.
How do you calculate wire cut time?
The material removal rate (MRR) for Wire cut EDM is calculated by using the equation(1), MRR = F×Dw×H (1) Where, F is the machine feed rate (mm/min), Dwis wire diameter (mm), H is the thickness of the workpiece (mm).
What voltage is high tension?
A high-tension cable carries more than 1000 Volts between conductors and 600 Volts between conductors and ground.
How many volts are in high tension lines?
The voltage of electricity conducted by distribution powerlines may vary from 415 volts (V), which are low voltage, to 66 kV (66,000 volts), which are high voltage.
Why is EDM used?
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 thick can EDM cut?
What is the minimum/maximum thickness of metal your wire EDM machines can work with? Our wire EDM machines can work with metal thicknesses anywhere from . 001 to 16 1/8”.
Which fluid is used in EDM machine?
deionized water
The dielectric fluid, or coolant, used in the wire electrical discharge machining (EDM) process, is deionized water. It serves several purposes: It acts as a semiconductor between the energized wire and the workpiece to maintain stable and controlled conditions for ionization in the spark gap.
What is spark gap in EDM?
Electrode gap (spark gap) is the distance between the electrode and the part during the process of EDM. Electro-mechanical or hydraulic systems are used to respond to average gap voltage. To obtain good performance and gap stability a suitable gap should be maintained.
What liquid is used in an EDM?
What are the components of EDM?
How is cutting load calculated?
The formula for cutting speed (sfm) is tool diameter 5 0.26 5 spindle speed (rpm). The formula for feed per tooth (fpt) is table feed (ipm)/number of flutes/spindle speed (rpm). The formula for spindle speed (rpm) is cutting speed (sfm) 5 3.82/tool diameter.
What is unit of cutting speed?
RPM is the rotational speed of the cutter or workpiece. Speed is the recommended cutting speed of the material in meters/minute or feet/min. Diameter in millimeters or inches.
What happens if the voltage is too high?
Voltage that is too high can cause premature failure of electrical and electronic components (e.g. circuit boards) due to overheating. The damage caused by overheating is cumulative and irreversible.