What is the principle of electric discharge machining?
What is the principle of electric discharge machining?
Working principle: The principle of working of EDM is based on the erosion of the material by repetitive sparks between the workpiece and the tool submerged in a bath of the dielectric medium. The working system is illustrated in Fig. 2.1. The workpiece and tools are two electrodes connected by D.C pulse generator.
What are the principle components of the EDM process?
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 is electrical discharge wire cutting?
Wire electrical discharge machining (EDM) is a process of metal machining in which a tool discharges thousands of sparks to a metal workpiece. Instead of cutting the material, EDM melts or vaporizes it, producing comparatively small chips and providing a very accurate cut line.
What is the principle of USM?
Ultrasonic Machining (USM) also called as ultrasonic vibration machining is a machining process in which material is removed from the surface of a part by low amplitude and high frequency vibration of a tool against surface of material in the presence of abrasive particles.
What are the applications of wire EDM?
Applications of wire EDM include:
- Prototype production.
- Automotive parts.
- Aerospace parts.
- Medical devices for implantations.
- Prototypes.
- Small hole drilling.
- Blanking punches.
- Extrusion dies.
What is EDM explain briefly the process characteristics of EDM?
Electro Discharge Machining (EDM) is an electro-thermal non-traditional machining process, where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. Work material to be machined by EDM has to be electrically conductive.
How is material removed in electro discharge machining?
In EDM, material removal is performed by applying a pulsating (ON/OFF) high-frequency current through the electrode to the workpiece. This removes (erodes) very tiny pieces of material from the workpiece at a controlled rate. The electrode and the workpiece are both immersed in a liquid called dielectric fluid.
What is wire cutting machine?
Wire EDM machine uses a metallic wire (electrode) to cut a programmed contour in a workpiece. Extrusion dies and blanking punches are very often machined by wire cutting. In the machining area, each discharge creates a crater in the workpiece (material removal) and an impact on the tool (wear of the tool/electrode).
Which is softer material in USM?
Which is softer material in USM? Explanation: Tool is softer than work piece in USM.
Which pump is used in USMM?
3. Which of the following pumps is used in USM? Explanation: In USM, A re-circulating pump forces abrasive suspended in a liquid medium between the vibrating tool face and work piece. Then the tool shaped like the cavity to be produced oscillates at amplitude of about 0.013 to 0.062 mm at 19 to 40 kilo hertz.
What do you mean by electric discharge machining?
INTRODUCTION Electric discharge machining (EDM), sometimes colloquially also referred to as spark machining, spark eroding, burning, die sinking or wire erosion, is a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks).
How does wire electrical discharge machining ( WEDM ) work?
Wire Electrical discharge machining (WEDM) is a non-traditional, thermoelectric process which erodes material from the work piece by a series of discrete sparks between a work and tool electrode immersed in a liquid dielectric medium.
What is the voltage of an electrical discharge?
The discharge voltage depends on the paired electrode materials and machining conditions. It ranges between 15 and 30 V. For proper machining conditions, electrical discharge occurs instantaneously and is independent from other electrical pulse parameters.
When do electrical discharges occur in a workpiece?
A series of electrical sparks or discharges occur rapidly in a short span of time within a constant spark gap between micro sized tool electrode and workpiece material. The nature of sparks is repetitive and discrete. The tool and the workpiece are adequately both immersed in a dielectric medium, such as,