Abstract: In NC milling surface machining,the relation curved surface formed by two two curves is often met.Such as the use of CAD software on the surface numerical control programming,the program is lengthy,the adjustment is not convenient,it can be used in the way of macro programming.Takes a part of curved surface processing as an example to introduce the idea of the preparation of the macro program and related instructions,and to process the macro program as a template.In the preparation of similar parts surface processing procedures,can be a template based program,adjust and modify the part of the program content,thus completing the new NC Macro program written to realize parametric programming.Through case programming,summed up the parameters of the program of attention.Because of machining curved surface using parametric programming macro program,improve the programming efficiency,in the production can be used to promote the use of.

Key words: double two time correlation surface, NC milling, macro program, parametric programming