US 12,440,880 B2
Method of determining tension pattern and method of coiling steel sheet
Ryuichi Suehiro, Tokyo (JP); Naoki Watanabe, Tokyo (JP); and Ryosuke Watanabe, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/998,807
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed May 19, 2021, PCT No. PCT/JP2021/019066
§ 371(c)(1), (2) Date Nov. 15, 2022,
PCT Pub. No. WO2021/235498, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 2020-087707 (JP), filed on May 19, 2020.
Prior Publication US 2023/0234116 A1, Jul. 27, 2023
Int. Cl. B21C 47/14 (2006.01); B21C 47/04 (2006.01); B65H 23/195 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01)
CPC B21C 47/146 (2013.01) [B21C 47/045 (2013.01); B65H 23/195 (2013.01); C21D 8/0242 (2013.01); C21D 9/46 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of coiling a steel sheet, the method comprising:
determining a tension pattern of tension applied to the steel sheet when coiling the steel sheet on a mandrel of a tension reel; and
coiling the steel sheet on the mandrel of the tension reel according to the determined tension pattern to achieve a coil, wherein
the determining the tension pattern comprises calculating a stress distribution in the coil after removal from the mandrel using an apparent elastic modulus in a radial direction of a coil comprising steel sheet layers and an air layer present therebetween, the apparent elastic modulus being obtained through actual measurement.