Stretch-bending formability of profile

Stretch-wrap bending is the essential forming processing for profile. Cross section distortion is the common defect during the stretch-wrap bending of profile, and it brings cross-effect with thinning of thickness and springback. The stretch-wrap bending formability for profile is much more difficult to analyze and to evaluate than that for sheet forming. The concept of stretch-wrap bending formability for profile was presented and an analytic model for profile with rectangular section was established. The effect of the geometric parameters such as section configuration, relative height and wall-thickness distribution of profile on stretch-wrap bending formability was studied based on finit element method (FEM) numerical simulation. The principle for optimization design of cross section was proposed in order to improve the stretch-wrap bending formability of profile.