US 12,168,253 B2
Method of manufacturing ring-rolled element
Kazuya Musha, Tokyo (JP); Jun Ohsone, Tokyo (JP); Yuji Ishiwari, Tokyo (JP); and Momoko Oji, Tokyo (JP)
Assigned to PROTERIAL, LTD., Tokyo (JP)
Appl. No. 17/787,865
Filed by PROTERIAL, LTD., Tokyo (JP)
PCT Filed Dec. 16, 2020, PCT No. PCT/JP2020/046953
§ 371(c)(1), (2) Date Jun. 21, 2022,
PCT Pub. No. WO2021/131963, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-234875 (JP), filed on Dec. 25, 2019.
Prior Publication US 2023/0043008 A1, Feb. 9, 2023
Int. Cl. B21H 1/06 (2006.01)
CPC B21H 1/06 (2013.01) 5 Claims
OG exemplary drawing
 
1. A method of manufacturing a ring-rolled member comprising ring-rolling a ring material with a ring-rolling device, an outer peripheral face of the ring material being at least partially inclined with respect to a central axis of the ring material, the ring-rolling device comprising a main roll and a mandrel roll, the main roll being positioned on an outer peripheral side of the ring material, the mandrel roll being positioned on an inner peripheral side of the ring material, wherein an outer peripheral face of the main roll includes a recessed portion to accommodate the ring material and an outer peripheral face of the mandrel roll, a first flange portion positioned on one side in a central axis direction of the main roll with respect to the recessed portion, and a second flange portion positioned on an opposite side of the first flange portion; an inner face of the recessed portion includes a rolling face to be in contact with an outer peripheral face of the ring material, a first inner face on a side of the first flange portion, and a second inner face on a side of the second flange portion; at least one inner face among the first inner face and the second inner face has a slope in such a way that an opening of the recessed portion is enlarged, with reference to a perpendicular plane perpendicularly intersecting the central axis direction of the main roll; the slope starts from within a range of a distance corresponding to a thickness of the ring-rolled member from a line of intersection between the at least one inner face and the rolling face; and an angle of the slope is greater than 0.3° and no greater than 9° with reference to the perpendicular plane.