One-step forming technology of nozzle of nuclear power main-steam super pipeline

Abstract

The invention provides a one-step forming technology of a nozzle of a nuclear power main-steam super pipeline. The technology comprises the steps as follows: a pipe blank of the nuclear power main-steam super pipeline is selected; prefabricated holes are formed in the pipe blank; the pipe blank is mounted in a positioning groove of a bottom base, and the prefabricated holes are placed upwards; a power unit, a male die, an upper die and a heating part are mounted, and an axis of a molding hole for forming the nozzle in the upper die, the center of the heating part, axes of the prefabricated holes and an axis of the male die are located on the same plumb line; the heating part is controlled to heat a deforming area of the prefabricated holes and is removed after the deforming area is heated to a certain temperature, and the upper die is moved downwards to be attached onto the pipe blank; and the power unit pushes the male die to move upwards, so that the deforming area is jacked and pulled to form the nozzle by one step. With the adoption of the one-step forming technology of the nozzle of the nuclear power main-steam super pipeline, the nozzle can be manufactured on the pipe blank within one hour, and the nozzle forming efficiency is effectively improved.

Description

technical field [0001] The invention relates to the field of nuclear power equipment, in particular to a nozzle forming process of a nuclear power main steam super pipeline. Background technique [0002] The main steam super pipeline of nuclear power is the secondary pipeline of nuclear power, which refers to a section of saturated steam pipeline outside the reactor containment from the containment mechanical penetration of the main steam pipeline to the first weld downstream of the main steam pipeline lateral restraint. 8.5MPa saturated steam, the design temperature is 316℃. The main steam super pipeline of nuclear power has high thermal parameters, many welds, and complex stress, especially in the case of accident conditions. In order to ensure the safety of nuclear power plants, the main steam super pipeline of nuclear power must have high safety. Therefore, specific requirements are put forward for the design, material selection, processing and manufacturing, as well as...

AI Technical Summary

Problems solved by technology

The entire process of forming a nozzle is long and takes a long time (nearly 4 hours), and the process is complicated. The number of nozzle heating and forming passes is more, which has a great impact on the impact toughness of the nozzle, and more energy is wasted. Several drawing forming processes also affect the accuracy of the nozzle, so an additional shaping process is required

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