MEC 431 Lecture Notes - Lecture 24: Plasma Channel, Dielectric, Boiling Point

• School: Ryerson University
• Department: Mechanical Engineering
• Course: MEC 431
• Professor: N/ A

Document Summary

2016-11-08: therefore, effective machining can be achieve through spark discharges of short duration and at high repetition rates. Lazeranko relaxation circuit: a simple circuit to provide the repetitive breakdown voltage, the volume of material removed is related to the discharge energy of, the discharge energy is: W =(cid:883) (cid:884) e ) t where: w = discharge energy. E = voltage at breakdown i = current t = time. Edm machining example: determine the feedrate if you wish to machine a (cid:883) (cid:886)(cid:499) x (cid:883) (cid:886)(cid:499) square hole into a block of steel (melting pt. 1538 c) if the hole is to be (cid:883). 7(cid:887)(cid:499) deep, how long will it take? (iaverage = 25a) Mechanical factors: dielectric fluid these fluids have three main functions, remain electrically non-conductive until breakdown occurs, a coolant, flushing fluid to remove workpiece metal particles applications. 20: alloys, such as copper-boron, silver-tungsten exhibit very low wear, graphite electrodes have gained much more acceptance.