Patent ID: 8214991

Claim:
A method of replacing a supporting bearing for a rolling roll with a new supporting bearing, said supporting bearing including an old inner ring disposed on an outer peripheral face of a neck portion of the rolling roll, wherein an old outer ring is disposed outside, in a radial direction, of said old inner ring, the old outer ring having an outer peripheral face thereof supported by a roll chock, and a plurality of old cylindrical rollers, the cylindrical rollers being disposed between said inner ring and said outer ring so as to roll, said method of replacing the supporting bearing comprising: replacing the old inner ring with a new inner ring, the new inner ring comprising an inner ring raceway diameter equal to an inner ring raceway diameter of the old inner ring, and an axial length of an inner ring raceway face of the new inner ring which is longer than an axial length of an inner ring raceway face of the old inner ring; after the replacing of the old inner ring with the new inner ring, operating the rolling roll and the supporting bearing prior to replacing the old outer ring or the old cylindrical rollers; and replacing said old cylindrical rollers with new cylindrical rollers having an axial length longer than an axial length of the old cylindrical rollers, and replacing said old outer ring with a new outer ring, the new outer ring comprising an axial length of an outer ring raceway face longer than an axial length of an outer ring raceway face of the old outer ring.