16-07-2013, 03:42 PM
Rear knuckle under-cut using EDM
Rear knuckle .docx (Size: 1,003.36 KB / Downloads: 28)
INTRODUCTION
Our main sponsorship SHIVA TOOLING SYSTEM SOLUTIONS (STS) done a very fantastic job, thanks to STS. The problem in lower mounting point of the rear upright had been resolved by making undercut on it. This was done by unconventional machining called EDM (Electric Discharge Machining).
ELECTRIC DISCHARGE MACHINING:
The process of metal removal is based on the principal of erosion of metals by an interrupted electric spark discharge between the electrode tool (cathode), and the work (anode). The discharge is usually through the electrolyte (EDM Oil). Both cathode, anode immersed in electrolyte or dielectric. The ionization of the dielectric leads to discharge.
The movement of cathode towards anode leads dielectric to ionize and more electrons from cathode creates resistance drop across the gap causing electric spark. The spark ultimately creates compression shock waves on work piece closer to tool surface. The metal is thus removed in this way from the work piece. The local temperature rise in that area is balanced by dielectric liquid.
Control system:
A small monitoring system used for EDM is shown in the picture.
The control system involves controlling of voltage between the terminals, DC current through the circuit, feed rate controls, pulse generator controls for controlling sparks, movement of worktable and tool.