In this paper, in order to make the simulation of the whole process of electrochemical machining(ECM), the characteristic of electric field and flow field is made detailed analysis in the gap of ECM. Mathematical-physical models of ECM simulation is set up based on the basic theories of electrochemistry, electric field and flow field. And the method of model solution is discussed and researched. So the theoretical base is established of the full process of ECM simulation.

Parametric design based on feature is the main method in parametric modeling of involute gear. In this paper, symmetric equations of the involute and the fillet curve are established according to the coordinates of points symmetrical about a straight line. And the tooth profile or alveolar profile of involute gear is generated accurately through controlling parameter of equations quantitatively. The problem of generating tooth profile accurately can be solved. Then the correctness of gear’s parametric design is ensured. The accuracy and efficiency of the gear’s engineering design are all improved.