The rear of the auto chassis structure is primarily composed of CTBA and trailing-arm. When the car rolls into a corner, the trailing arm reacts to roll in the same degree as the car body. This paper covers finite element simulations to evaluate the pipe bending process of auto chassis component i.e. Trailing-arm product. During the bending process of trailing arm the tube undergoes significant deformation. So that forming defects such as thinning and flattening will be generated in the tension side of the pipe. In this process we analyzed the pipe bending process by using FEM and analyses and optimize several parameters which are displacement distance of pressure die, boosting force, and mandrel positions in regarding to the thinning and flattening of the tube.
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