Mould for forging special connecting pipe of vapor-water separation reheater of nuclear power plant and forging method

Abstract

The invention provides a mould for forging a special connecting pipe of a vapor-water separation reheater of a nuclear power plant and a forging method. An inner cavity of an upper mould and an outer circle of a mould core are respectively of splayed shapes, and a lower mould which is formed by arranging the mould core on a mould core base and assembled with the upper mould to form a splayed cavity. A flange blank is heated to 1150 DEG C-1220 DEG C, the upper mould and the lower mould are pre-heated to 300 DEG C-400 DEG C, a demoulding agent is smeared on the upper mould and the lower mould, an assembly mould is arranged on a movable platform of a hydraulic machine; and the heated blank flange is arranged on the lower mould along a mould profile cavity, and the upper mould and the lower mould are pre-assembled through a guide column and pressed through the hydraulic machine to enable the upper mould and the lower mould to be assembled to keep the pressure for 5-10minutes to take out a forging piece, and the forging piece is cooled and subjected to heat treatment and minimum allowance machining to manufacture the special connecting pipe. The mould can be used for forging the special connecting pipes with different materials and sizes, and the fiber directions are distributed along with the shapes, thereby the mould has the advantages of security and reliability, high-temperature resistance property, high pressure resistance property, corrosion resistance property, small machining allowance, material saving, short processing period and low cost.

Description

technical field [0001] The invention belongs to the technical field of forging and pressing manufacturing, and in particular relates to a mold and a forging method for forging a special-shaped connecting piece of a steam-water separation reheater of a nuclear power plant. Background technique [0002] Special-shaped nozzles, usually used to connect with cylindrical parts of pressure vessels, are a part of the pressure-bearing boundary, which have very high requirements for high temperature, high pressure and corrosion resistance. When the traditional method is used to manufacture the part, it is first forged into a flange with a large margin, and then the excess metal is removed by machining. The flange is cut off due to the fiber direction, which not only reduces its comprehensive mechanical properties and service life, but also reduces the ability to resist high temperature, high pressure and corrosion, thus leaving a safety hazard; due to the large machining allowance of ...

AI Technical Summary

Problems solved by technology

The flange is cut off due to the fiber direction, which not only reduces its comprehensive mechanical properties and service life, but also reduces the ability to resist high temperature, high pressure and corrosion, thus leaving a safety hazard; due to the large machining allowance of the forged flange , increase the processing cycle, large material waste, high manufacturing cost

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