Abstract: Facing cutting of multi-pipe intersection curve, a method for 3D truss structure drawing separating and pipe data extracting is presented. Firstly the whole structure with 3D surface is separated into a series of basic elements. Secondly the corresponding parameters of all pipes are obtained by analyzing and calculating of elements. Computational method of pipe intersection parameters for cutting intersection curve is presented. The method is feasible and valid proved by cutting on the 6 axis CNC pipe cutting machine.

Key words: computer application, separating of truss structure drawing, data extracting of intersection curve, NC machining