A Composite Strengthening Method for Upsetting and Bulging of Generator Guard Ring

Abstract

The invention discloses an upsetting and bulging combined reinforcement method for a protective ring of a power generator. The upsetting and bulging combined reinforcement method for the protective ring of the power generator comprises the steps that a protective ring blank is placed on the conical surface of a lower die, and an upper die is placed on the conical surface of the upper end face of the protective ring blank through the cooperation with a force decreasing column; high-pressure liquid is injected into an annular cavity between the protective ring blank and the force decreasing column from the lower die through the force decreasing column, the liquid pressure is applied to the inner wall of the protective ring blank, and an axial compression load is applied to the protective ring blank through the upper die; and the protective ring blank deforms plastically under the combined action of the internal pressure and the axial compression load, and the purpose of reinforcing the protective ring blank is achieved. On the premise that the material yield condition of the protective ring is met, each set of certain axial compression load and radial load internal pressure and the change rule of the axial compression load and the radial load internal pressure form a loading path, and different loading paths can be obtained by adjusting the proportion of the internal pressure and the axial compression load; and control over the internal pressure and the axial compression load is converted into control over the pressing speed v of the upper die and the flow of the high-pressure liquid entering an inner cavity of the ring blank according to the constitutive relation of plastic mechanics.

Description

Technical field: [0001] The invention relates to the technical field of steam turbine generators and nuclear power generators, in particular to an upsetting and bulging composite strengthening method for a generator retaining ring. Background technique: [0002] The retaining ring is a key forging in turbogenerators and nuclear power generators. It has an interference fit with both ends of the rotor, and presses the rotor end coils tightly on the shaft to prevent them from flying out under the action of centrifugal force. The retaining ring rotates at high speed with the rotor. In addition to bearing the huge centrifugal force of the end of the rotor winding and itself and the superimposed load of the coil winding on the retaining ring, it also bears the assembly stress during shrink fitting. The environment is harsh. In order to ensure the safe operation of the generator set, the retaining ring is required to have high yield strength, good plastic toughness, uniform mechan...

AI Technical Summary

Problems solved by technology

In addition, in this kind of bulging process, the size relationship between the blank and the retaining ring before and after bulging is one-to-one correspondence, so the requirements for the size of the blank are extremely strict, and if you are not careful, there will be waste products due to size problems

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