Forming method for integrally-forged multiple pipe nozzles of large-scale integrated connecting pipe section

Abstract

The invention provides a forming method for integrally-forged multiple nozzles of a large-scale integrated connecting pipe section, which comprises the following steps: preparing a cylindrical intermediate blank, and arranging an annular convex shoulder for forming the nozzles on the outer wall of the intermediate blank; sleeving two annular ring cutters on the blank on two sides of the annular convex shoulder, pushing the ring cutters to move towards the annular convex shoulder, and cutting edges of the ring cutters into the root of the annular convex shoulder; the annular convex shoulder is subjected to material distribution, and a plurality of pipe nozzle blanks are obtained; pre-forging the pipe nozzle blank by using a pre-forming die to obtain a pipe nozzle intermediate blank; and carrying out finish forging on the pipe nozzle intermediate blank by utilizing the finish forming die to obtain the pipe nozzle. The material utilization rate and the forging efficiency can be improved, and the pipe nozzle with uniform allowance, complete streamline and excellent performance can be obtained.

Description

technical field [0001] The invention relates to the technical field of integral forging and forming of large-scale integrated connecting sections, in particular to a forming method for integrally forging multiple nozzles of large-scale integrated connecting sections. Background technique [0002] The large-scale integrated connecting section involved in the present invention is the core component of the nuclear reactor pressure vessel, and its structure includes a flange section, a cylinder section and a plurality of overhanging nozzles that are evenly or non-uniformly distributed on the outer wall of the flange section, such as figure 1 and figure 2 As shown, the wall thickness of the flange section is thicker than that of the cylinder section, and the outline size exceeds φ5m×5m, which is a super-large joint section cylinder. There are multiple nozzles distributed in the circumferential direction. When the centerline angles of adjacent nozzles are the same, that is, when...

AI Technical Summary

Problems solved by technology

The shape of the forging obtained by adopting the forging method of enveloping the ring is relatively simple, and the difficulty of forging and forming is reduced, but there will be the following problems: 1. The size of the base body of the connecting section of the nozzle is already too large, and the forging The size and grade of steel ingots used are huge

Due to the long length and large diameter of the nozzle, the ring enveloping forging will occupy the entire circle of metal material, so that the grade of the steel ingot may exceed the limit of the equipment and cannot be forged

2. After the enveloping forging of the ring belt, in the process of forming the nozzle by machining, the flow direction of the forging fiber of the nozzle will be cut off, which is not conducive to improving the mechanical properties of the nozzle

3. The processing and removal amount of the machining forming nozzle is large, and the processing cycle is long

[0007] It can be seen that the above-mentioned prior art is to obtain circular connecting pipes by machining, the removal amount of machining is large, the material utilization rate is low, the machining time is long, and only one or two connecting pipes can be processed each time, which is inefficient and It can no longer meet the design requirements of integral forging of the integrated connecting section

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