Abstract
Usage of high-strength steels with limited bendability in conventional air bending is not obvious due to the deformation limits of these materials. An attractive solution for deformation reduction is the utilization of large radius punches. The bending process for large radius tooling is dissimilar to conventional air bending, due to the presence of the multi-breakage phenomenon. This phenomenon has been observed by many researchers, but understanding of the influencing parameters is limited. Multi-breakage poses a serious obstacle, since it changes the loading scheme from the typical three-point to four-point bending. In this contribution, an extensive experimental exploration of large radius bending leads to conclusions on the influence of tool dimensions and material characteristics. Air bending experiments have been performed for five materials, four thicknesses, four punch radii, and four die openings. Based on the observed force measurements, the process can be defined as large radius bending when the ratio punch radius/die opening is larger than 1:4. Trends for the influencing parameters of the measured data can be used for further investigation of large radius air bending.
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