US 12,134,813 B2
Burring processed member
Kohei Nakada, Tokyo (JP); Ryo Tabata, Tokyo (JP); Takeshi Kawachi, Tokyo (JP); and Takeshi Toyoda, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/032,108
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Oct. 13, 2021, PCT No. PCT/JP2021/037961
§ 371(c)(1), (2) Date Apr. 14, 2023,
PCT Pub. No. WO2022/080431, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 2020-173813 (JP), filed on Oct. 15, 2020.
Prior Publication US 2023/0399729 A1, Dec. 14, 2023
Int. Cl. C22C 38/60 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01); B62D 29/00 (2006.01)
CPC C22C 38/60 (2013.01) [C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); B62D 29/007 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A burring processed member comprising a sheet-shaped part and a burring processed part, wherein
the sheet-shaped part has a first surface at one side and a second surface at an opposite side to the first surface,
the burring processed part has a burring wall part,
the burring wall part sticks out to one side from the first surface,
the burring wall part has a vertical wall part and a curved wall part,
the vertical wall part has a burring end face at one side and is connected to the curved wall part at an opposite side to the one side,
the curved wall part is connected to the vertical wall part at one side and is connected to the sheet-shaped part at an opposite side to the one side, and
the burring processed part has a structure satisfying the following relations (1) to (3):
3≤Ra≤100  (1)
3.0<h  (2)
24+r−[TS/(40+0.28×Ra)]<h  (3)
where,
“Ra” is an arithmetic mean roughness μm of the burring end face,
“h” is a height mm from the first surface to the burring end face,
“r” is a radius of curvature mm of the curved wall part, and
“TS” is the tensile strength MPa of the sheet-shaped part.