The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2019
Filed:
Mar. 29, 2016
Hitachi Metals, Ltd., Tokyo, JP;
Naoyuki Iwasa, Shimane, JP;
Tsuyoshi Fukui, Shimane, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
A ring rolling mill includes: a rotary drive main roll and a mandrel roll, which are for reducing the thickness of and rolling a ring-shaped material from the radial direction; a pair of rotary drive axial rolls for reducing the thickness of and rolling the ring-shaped material from the axial direction; a measuring roll for measuring the diameter of the ring-shaped material during rolling; and a speed control unit for controlling the speed of the axial rolls. The speed control unit is configured to repeat measuring the diameter at predetermined time intervals Δt and comparing a measurement value Lof the diameter at time t and a measurement value Lof the diameter at time t+Δt, and the speed control unit is further configured to maintain the speed of the axial rolls unchanged upon the result of the comparison being L<L.