US 12,109,605 B2
Bead forming method and structural member
Taiki Yamakawa, Kobe (JP); Toru Hashimura, Kobe (JP); and Yasuhiro Maeda, Kobe (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP)
Appl. No. 17/289,149
Filed by Kobe Steel, Ltd., Kobe (JP)
PCT Filed Oct. 10, 2019, PCT No. PCT/JP2019/040042
§ 371(c)(1), (2) Date Apr. 27, 2021,
PCT Pub. No. WO2020/100483, PCT Pub. Date May 22, 2020.
Claims priority of application No. 2018-213881 (JP), filed on Nov. 14, 2018.
Prior Publication US 2021/0379643 A1, Dec. 9, 2021
Int. Cl. B21D 39/04 (2006.01); B21D 39/20 (2006.01); B21D 41/02 (2006.01); B21D 53/88 (2006.01); B60R 19/24 (2006.01)
CPC B21D 39/044 (2013.01) [B21D 39/20 (2013.01); B21D 41/02 (2013.01); B21D 53/88 (2013.01); B60R 19/24 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A bead forming method comprising:
accessing a pipe body having outer walls and partition walls, the partition walls being arranged in parallel within the outer wall such that the partition wall divides an internal space of the pipe body into three rooms, the three rooms including a first outer room and a second outer room having a same shape and a central room that is smaller than the first and second outer rooms;
accessing elastic bodies that can be inserted into the pipe body and a pusher that presses the elastic bodies;
inserting a first pair of the elastic bodies into the first outer room of the pipe body and arranging the first pair of the elastic bodies in the first outer room of the pipe body so as not to come into contact with the partition walls;
inserting a second pair of the elastic bodies into the second outer room of the pipe body and arranging the second pair of the elastic bodies in the second outer room of the pipe body so as not to come into contact with the partition walls; and
forming a buckling bead in each of the first and second outer rooms by compressing the first and second pair of elastic bodies in a longitudinal direction of the pipe body by the pusher to expand the elastic bodies outward in a radial direction without coming into contact with the partition walls, so as to bulge a part of the outer walls of the pipe body outward in the radial direction without deforming the partition walls.