Explain the working principle, Surface finish, material removal, accuracy,advantages and application of Electrochemical Grinding(ECG).

(a) In electro chemical machining of pure iron a material removal rate of 600mm³/min is required. Estimate current required.

Atomatic weight of iron Afe = 56

Density = 7.8gm/cc 10

b) Composition of Nickel super alloy is as follows:

Ni= 70%, Cr=20% , Fe = 5% and rest titanium . Determine ratye of dissoulation if the area of the tool is 1500mm². and a current is 2000 A is being passed through the cell. Assume dissolution to take place at lowest valency of the element.

A_ni = 58.71 ρ_ni=8.9 V_Ni=2
A_cr = 51.99 ρ_cr=7.19 V_cr=2
A_fe = 55.85 ρ_fe=7.86 V_fe=2
A_ti = 47.90 ρ_ti=4.51 V_ti=3