PROCESS DESIGN METHOD AND FORGING CONTROL METHOD IN RING FORGING

摘要

PROBLEM TO BE SOLVED: To provide a design method of a forging process, in which a right cylindrical shell such as a main body of a large-sized pressure container is effectively formed in a target shape by ring forging while drop in yield is prevented, and a forging control method using it.;SOLUTION: The design method of a forging process comprises: a step of setting an outer diameter D1, wall thickness T1, length L1, target rolling draft S, and rolling draft P per go-around when starting forging of a large-sized ring material; a step of determining the number of necessary go-around N; and a step of preparing a prediction formula which formulates the outer diameter D2 and the length L2 after deformation (enlarged diameter) for every go-around of the large-sized ring material and is corrected by forge data of an actual device. This design method controls the outer diameter and the length in the ring forging process of the actual device using the predicted outer diameter D2 and the length L2 per go-around. As a result, precise prediction for the outer diameter and the length of a forging finish material is possible, to thereby effectively determine material shapes or forging conditions.;COPYRIGHT: (C)2008,JPO&INPIT