Combining the example of drawing die design for the rear side member of automobile body, studied on the drawing die structure design of saddle-shape part.

Analyzed the structure characteristics and forming process of the stiffening plate of front-carling. According to the spring-back problem, proposed the rectification method.

Safety and comfort influence the choice of suspention. A trailing-arm torsion -beam rear suspention are found to satisfy the demands of both safety and comfort.