METHOD AND DEVICE FOR ROLLING BY RING ROLLING

摘要

PROBLEM TO BE SOLVED: To reduce the generation of defects in shape such as dents on a ring- like material to be rolled in rolling by ring rolling in the system of which reduction in the height direction is performed with an edger. SOLUTION: By providing lubricating oil discharging means 20 which is provided with a valve element with which a flow passage is opened in accordance with specific-pressure load when performing thickness reduction with a mandrel 13 in a plurality of places on the peripheral surface of the mandrel, lubricating oil is supplied to a press-contact part in accordance with the specific- pressure load in the press-contact part of the mandrel.