英文翻译，不要在线翻译的！
By changing the direction of the steering wheel to change the direction of motor cars, multi-function steering wheel is also equipped with audio for Taiwan, the volume button, hands-free car phone, navigation screen, the Menu key and other structural facilities. Therefore, both beautiful and practical design of the steering wheel is undoubtedly a very real sense, taking into account ergonomic principles, to make it into round shape, operating with the aesthetics are superior to non-circular, and the steering wheel and often used injection molding design three-dimensional graphics software AutoCAD, CAD designers can reduce the calculation of drawing such as repetitive work, focused on the design itself, to shorten the design cycle and improve design quality, and more directly reflects the physical and interference occurred in the design. In this paper, AutoCAD software to design a car steering wheel and the injection mold, injection mold design is built on the basis of the steering wheel design. The domestic auto component injection molding excellent prospects for development. Using CAD to design the steering wheel and the injection mold of the traditional design innovation, efficiency has been greatly improved.