Forging method for ellipsoidal head ring forge piece of third generation nuclear power plant steam generator

Abstract

The invention discloses a forging method for an ellipsoidal head ring forge piece of a third generation nuclear power plant steam generator. The manufactured forge piece comprises a bending section and a straight section; the forging method is executed by using a megaton-level free forging press, forging a dual-vacuum steel ingot into a whole straight section and then forging the straight section into the bending section by rotary die pressing by a die; the forging process comprises the following steps of: firstly, cogging: cutting a feeder head and a bottom from the dual-vacuum steel ingot; secondly, upsetting: heating work pieces to be 1220 plus or minus 20 DEG C, so that the heights of the work pieces are reduced and the diameters of the work pieces are increased after the work pieces are subjected to upsetting; thirdly, chambering: heating the work pieces to be 1220 plus or minus 20 DEG C, so that the wall thicknesses of the work pieces are reduced and the diameters of the work pieces are increased after the work pieces are subjected to chambering; and fourthly, carrying out a rotary die pressing process: heating the work pieces to be 1200 plus or minus 20 DEG C, so that the diameters of the work pieces are reduced and the wall thicknesses of the work pieces are increased after the work pieces are subjected to the rotary die pressing process. By adopting a forge piece forged by the forging method, dense material, reasonable distribution of a metal flow line and low possibility of cracking of the ellipsoidal head ring forge piece can be guaranteed.

Description

technical field [0001] The invention relates to a method for manufacturing a large forging for nuclear power equipment, in particular to a method for forging an elliptical head ring forging for a third-generation nuclear power plant steam generator. Background technique [0002] In recent years, power shortage has become a bottleneck restricting the sustained and rapid economic development of various countries. As an important measure to save energy and adjust energy structure, nuclear power has been included in the national power development plan. The global nuclear power has entered a period of rapid development, in order to improve the energy structure, industrially developed countries and developing countries are actively committed to the development of nuclear power. [0003] At present, nuclear power technology is developing in the direction of large-scale, and the manufacture of key equipment in third-generation nuclear power plants requires the use of super-large for...

AI Technical Summary

Problems solved by technology

The structure of the reactor steam generator (SG) elliptical head ring forging in the third-generation nuclear power reactor type AP1000 project is as follows figure 1 As shown, due to its large diameter (outer diameter 5710mm, inner diameter 5140mm) and complex shape (including curved section and straight section), it is impossible to manufacture a forging so close to the shape by using the existing forging method

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