METHOD OF MANUFACTURING RING-ROLLED ELEMENT

Title:

METHOD OF MANUFACTURING RING-ROLLED ELEMENT

Document Type and Number:

WIPO Patent Application WO/2021/131963

Kind Code:

A1

Abstract:

Provided is a method of manufacturing a ring-rolled element that, despite a main roll of a ring-rolling device being provided with flanges positioned above and below a ring blank, can stabilize the posture of the ring blank, without defects or the like occurring in the obtained ring-rolled element. The ring-rolling device utilized in this method of manufacturing the ring-rolled element is provided with a main roll 10 and a mandrel roll 20. The outer-peripheral surface of the main roll has: a recessed part 12 for accommodating the ring blank and the outer-peripheral surface of the mandrel roll 20; an upper flange 11 located above the recessed part; and a lower flange 13 located below the recessed part. The inner surface of the recessed part has a rolling surface 12S that contacts the outer peripheral surface of the ring blank, an upper surface on the upper flange side, and a lower surface 13S on the lower flange side; and the lower surface 13S has a gradient such that the opening of the recessed part 12 widens. The gradient starts within the range from the line intersection between the lower surface 13S and the rolling surface 12S, to a distance equivalent to the thickness of the ring-rolled element. The angle of the gradient is more than 0.3° and 9° or less with a perpendicular plane serving as a reference standard.

Inventors:

MUSHA KAZUYA (JP)
OHSONE JUN (JP)
ISHIWARI YUJI (JP)
OJI MOMOKO (JP)

Application Number:

PCT/JP2020/046953

Publication Date:

July 01, 2021

Filing Date:

December 16, 2020

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

B21B5/00; B21H1/06; B21J5/00

Foreign References:

JP2014188580A	2014-10-06
JP2013169563A	2013-09-02
JP5895111B1	2016-03-30
CN107127279A	2017-09-05

Other References: