Abstract: In order to solve the difficult problems of machining spatial curved surface parts in wire cut electronic discharge machining(WEDM), to get high tapered spatial complicated curved surface parts, an CAD/CAM system based on the mathematical models and numerical control(NC) models of spatial surface are developed. The NC turning and two sways table is the key part of system hardware, which can be com-posed of the spatial surface machining system with the normal WEDM with high speed (WEDM-HS). The system software can establish the 3D model by analyzing and calculating the equation of the upper and lower leads, and get the NC machin-ing code automatically according to the model, then test it by machining simulation, and machining. Machining experiment of machining typical spatial complicated curved surface parts have done and the machining samples are like the simulation ones basically. Besides, the influence of the machining error by the NC model and the clearance angle of the sway back are analyzed. All these works provide an effective approach for us to resolve the problems of cutting spatial curved surface parts by WEDM-HS.

Key words: Computer simulation, Mathematical model, Spatial curved surface, Wire cut electronic discharge machining (WEDM) CAD/CAM