Integrative method of design and manufacture on streamlined head of train

In order to insure that the streamlined shape of train head is consistent with its structure, the characters of the shape and structure were analyzed, and a design and manufacture integrative method of the shape and structure was developed on the ARX of AutoCAD and the Open I-deas of I-deas software flat roof. The method includes three modules. The first is shape design module based on non uniform rational B spline(NURBS) theory, the second is structure design module based on the intersection theory between two NURBS surfaces and 3-D geometric modeling technique, the third is NC machining module of bend sheet-beams of head structure based on line approximation form of NURBS and programming technique. Applied result shows that the complex streamlined shape of train head can be promptly and freely designed according to human's will, the head grid structure made up of bend sheet-beams can be created automatically, and the relevant NC machining files of bend sheet-beams are made aimed at the different NC machining tools; the time-cost works, formerly cooperated among the departments of design, technique and machine, are fully finished by computer, an important revolution is realized in the design and manufacture of train head.