Abstract
Shearing processes of high strength steel sheets increasingly applied to lightweight automobile parts were reviewed. With the increase in strength of the high strength steel sheets, shearing operations become hard. First, the sheared edge quality in shearing of high strength steel sheets and the effects on the formability and fatigue strength were shown. Next, ironing processes with a taper punch and a punched slug, a slight clearance punching with a punch having a small round corner and a thickening process of the sheared edge were explained as processes for improving the sheared edge quality. Finally, hydrogen-induced delayed fractures of cold-sheared ultra-high strength steel sheets and of hot-trimmed parts were evaluated.
Highlights
Lightweighting of automobiles is useful to heighten the fuel efficiency, and approaches from shape optimisation and lightweight materials
The weight of automobile parts can be reduced by optimizing the shape to increase the stiffness and crash resistance
The application of high strength steel sheets to the body-in-white tends to increase, and the use of ultra-high strength steel sheets having a tensile strength above 1 GPa for reinforcements is expanding
Summary
Lightweighting of automobiles is useful to heighten the fuel efficiency, and approaches from shape optimisation and lightweight materials. The 1 GPa ultra-high strength steel sheets have been commonly formed into automobile body components, and the use of 1.2 GPa steel sheets increases. For edge the high sheets, notlow onlyquality forming and shearing sheared is a strength fracture steel surface having andoperations accuracy [14]. The shearing load is because reduced the by of ultra-high strength in steel sheets,of the noise level issteel highsheets and the operation is dangerous asheared tool shear angle inclined sheets scraps fly and at high speeds [20]. The accuracy of calculated results of initiation out of continuum mechanics which the finite element simulation is based, criteria shearing isprocesses is not high, and on shearing processes of high strength steel and sheets are for the crack initiation are required [22,23,24]. In this paper, shearing processes of high strength steel sheets are reviewed
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