US 12,391,201 B2
Expanded tube for a motor vehicle crash box and manufacturing method for it
Stefan Lindner, Willich (DE)
Assigned to Outokumpu Oyj, Helsinki (FI)
Appl. No. 17/759,227
Filed by Outokumpu Oyj, Helsinki (FI)
PCT Filed Jan. 28, 2021, PCT No. PCT/EP2021/051994
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/152015, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 20154182 (EP), filed on Jan. 28, 2020.
Prior Publication US 2023/0060627 A1, Mar. 2, 2023
Int. Cl. B60R 19/34 (2006.01); B60R 19/03 (2006.01); F16F 7/12 (2006.01); B21C 37/08 (2006.01); B21C 37/16 (2006.01)
CPC B60R 19/34 (2013.01) [B60R 19/03 (2013.01); F16F 7/125 (2013.01); B21C 37/0803 (2013.01); B21C 37/16 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A motor vehicle crash box with a working direction in a vehicle's longitudinal axis, wherein the component is manufactured out of a tube which is made of an austenitic steel which has a homogeneous austenitic microstructure with a strain hardening effect even after forming, which is expanded by a forming process into an expanded tube having at least three zones, each zone having a different material strength and a different diameter;
wherein a center of the expanded tube in longitudinal direction works as a mirror axis and the zones are characterized in a way that starting from the outer-sides to the center, the diameter of each respective zone of the at least three zones decreases towards the center.