The Electrochemical grinding (ECG) and
Electro-chemical machining (ECM) are similar
instead of tool used in Electro-chemical
grinding is an abrasive grinding wheel in place
of tool. The metal is removed both by
Electro-chemical decomposition (90%) and
abrasion of the metal (10%). A non corrosive
salt solution is used as an electrolyte. It also
acts as cutting fluid or coolant.
The grinding wheel is made cathode (-ve charge) and work piece is made
anode (+ve charge). Both the work piece and grinding wheel are
electrically conductive. Grinding wheel rotates and is mounted on a
spindle. Workpiece is held in a fixture and can be moved in forward and
backward direction. Electrolyte is pumped in gap between grinding wheel
and workpiece. Current flows from cathode to anode through the
electrolyte. This results in chemical oxidation of workpiece. The oxide
film formed on work piece is removed by the grinding wheel. It produces
an accurate and fine surface. The material removed from work piece is
decomposed into electrolyte solution.
In this process metal removal rate is very low and power consumption is
It has increased tool life and there is negligible wear of tool so
dressing of wheel is not required frequently.
The grinding wheel is a metallic disc embedded with abrasive material.
The most commonly used materials are copper, brass and bronze. Aluminum
oxide and diamond particles are used as abrasive material.
The grinding wheel and work piece are insulated from rest of the
It is used for precise grinding of hard material like tungsten carbide