4. Conclusion
AHSS MS980 is a potential material to replace tradition steel to achieve lightweight in passenger car. To study
the performance of roll forming with MS980, the circle-to-square roll forming FE model was established based on
ABAQUS/Explicit. And the effect on material strength and roll compressive distribution scheme on roll forming
process are discussed. The main conclusions show the following:
(1) The evaluation of forming accuracy for square tubes has been put forward, including fillet radius, edge
convexity and so on.
(2) The increase of material strength will result to smaller fillet radius, larger thickening at fillet, and worse
convexity at straight edge.
(3) Equal compression distribution scheme performs better for section shape. Its mold load of each pass is more
even than Parabola distribution and decline distribution schemes.
The research provided good reference for the roll forming of advanced high strength steel.