Eqn.2.35 has been applied in many approximate calculations of manufacturing operation, for example at surface leveling. This can be clarified by considering a following case. A and B on the anode-workpiece, which are shown in Fig.2.11. As a result of decreasing material removal rate, a decrease of current density results. If the power supply is working in constant current mode, the voltage increases with machining time, and material removal rate is approximately also constant.
V f is described by and equ.
The solution of Eqn. The changing in position of the anode during ECM with constant feed rate of tool electrode by Eqn 2.43 is shown in Figure 2.13. With the increase of Z a , the term with the exponential function in Eqn. 2.43 is decreasing and curves 2 and 3 go to an asymptote line. After some time process, dissolution practically stabilizes and the metal removal rates V n becomes equal to the tool feed rate V f .