To dispense with a barrel polishing process and form a uniform nitrided film when manufacturing an endless metallic ring used in a continuously variable transmission.
A polishing device is composed of an end face polishing device and an inner and outer peripheral face polishing device 2000. The inner and outer peripheral face polishing device 2000 includes a ring rotary roller 2040 for rotating a ring 104, an outer peripheral face polishing roller 2020 abutted on an outer peripheral face of the ring 104, an inner peripheral face polishing roller 2030 abutted on an inner peripheral face of the ring 104, and a constant pressure feeding actuator 2200 for moving a clearance and facial pressure between the outer peripheral face polishing roller 2020 and an inner periphery side back-up roller 2022 and a clearance and facial pressure between the inner peripheral face polishing roller 2030 and an outer periphery side back-up roller 2032 variably.
ITO YOSHINORI
Toshio Morita
Takao Matsuyama
Tadashi Muto
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