Hollow forging method of nuclear power main pipeline

A main pipe, hollow technology, applied in the field of forging, can solve the problems of high manufacturing cost and long processing time, and achieve the effects of reducing machining, high utilization rate of raw materials, and shortening manufacturing cycle.

Active Publication Date: 2013-06-12
TONGYU HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hollow forging method for the main pipeline of nuclear power to solve the problem that the existing technology adopts the integral solid forging technology, and then processes the inner hole of the main pipeline, which requires long processing time and high manufacturing cost.

Method used

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  • Hollow forging method of nuclear power main pipeline
  • Hollow forging method of nuclear power main pipeline
  • Hollow forging method of nuclear power main pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first forging: heating the steel ingot to 1250°C, keeping it warm for a certain period of time, and upsetting to figure 1 shape, return to the oven for reheating;

[0023] The second forging: heat the above-mentioned forging to 1240°C, keep it warm, and stretch it to figure 2 shape, return to the oven for reheating;

[0024] The third forging: heat the above forging to 1220°C, keep warm, upset and punch to image 3 shape, return to the oven for reheating;

[0025] The fourth forging: heating the above forging to 1200°C, keeping it warm, reaming and pulling out the mandrel to Figure 4 Shape, cut shoulders, pull out the mandrel and grow out of the ring belt boss, return to the furnace for reheating;

[0026] Fifth forging: heat the above forging to 1200°C, keep warm, and pull out the mandrel to Figure 5 shape, pipe wall thickness t 0 =2t f , t f The wall thickness of the final shape hollow forging is returned to the furnace for reheating;

[0027] The sixt...

Embodiment 2

[0029] The first forging: heating the steel ingot to 1240°C, keeping it warm for a certain period of time, and upsetting to figure 1 shape, return to the oven for reheating;

[0030] The second forging: heat the above-mentioned forging to 1240°C, keep it warm, and stretch it to figure 2 shape, return to the oven for reheating;

[0031] The third forging: heat the above forging to 1220°C, keep warm, upset and punch to image 3 shape, return to the oven for reheating;

[0032] The fourth forging: heat the above-mentioned forging to 1220°C, keep it warm, ream the hole and pull out the mandrel to Figure 4 Shape, cut shoulders, pull out the mandrel and grow out of the ring belt boss, return to the furnace for reheating;

[0033] The fifth forging: heat the above forging to 1220°C, keep warm, and pull out the mandrel to Figure 5 shape, pipe wall thickness t 0 =1.2t f , t f The wall thickness of the final hollow forging is returned to the furnace for reheating;

[0034] T...

Embodiment 3

[0036] The first forging: heating the steel ingot to 1220°C, keeping it warm for a certain period of time, and upsetting to figure 1 shape, return to the oven for reheating;

[0037] The second forging: heat the above-mentioned forging to 1220°C, keep it warm, and stretch it to figure 2 shape, return to the oven for reheating;

[0038] The third forging: heat the above forging to 1220°C, keep warm, upset and punch to image 3 shape, return to the oven for reheating;

[0039] The fourth forging: heat the above-mentioned forging to 1220°C, keep it warm, ream the hole and pull out the mandrel to Figure 4 Shape, cut shoulders, pull out the mandrel and grow out of the ring belt boss, return to the furnace for reheating;

[0040] The fifth forging: heat the above forging to 1180°C, keep it warm, and pull out the mandrel to Figure 5 shape, pipe wall thickness t 0 =1.6t f , t f The wall thickness of the final shape hollow forging is returned to the furnace for reheating;

...

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Abstract

The invention relates to a hollow forging method of a nuclear power main pipeline, and belongs to the technical field of forging. According to the forging method, hollow forging is carried out in a free forging manner, a boss part is formed in an annular belt manner, and the deformation is reserved before a core rod is drawn out to be in a final shape. The forging method comprises the following processing steps of: (1) upsetting; (2) drawing out; (3) upsetting and punching; (4) chambering and drawing out the core rod; (5) carrying out shoulder feeding; (6) carrying out shoulder splitting; (6) drawing out the core rod: heating a hollow forged piece obtained in the step (5) till 1000-1050 DEG C, and drawing out till a final shape is formed; heating multiple times till 1000-1050 DEG C if the shape cannot be formed after one heating number, and drawing out till the final shape is formed. The nuclear power main pipeline with the boss is forged in the manners of punching, chambering and drawing out the core rod, the boss part is forged into an annular manner, and the shape of the nozzle of the boss is ensured. The forged piece is directly forged into a hollow pipeline, so that the subsequent machining is reduced, and the manufacturing period is shortened. The technical requirement of the third generation forging main pipeline can be met, and the utilization ratio of raw material is high.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a free forging method. Background technique [0002] Nuclear power main piping is the piping that connects the reactor pressure vessels, steam generators, and reactor coolant pumps in a nuclear power plant. In the design, the main pipe has a boss nozzle, and the main pipe of the hot section has two bosses at an angle of 45°. The main pipeline of the third generation AP1000 nuclear power introduced in my country requires forging to be integrally formed. It is more difficult than traditional cast pipe technology. [0003] At present, the main pipes of nuclear power produced in China usually adopt the overall solid forging technology, and then the inner holes of the main pipes are processed out, which takes a long time for processing and high manufacturing costs. Contents of the invention [0004] The purpose of the present invention is to provide a hollow forging method for nucl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/08B21J5/10
Inventor 司兴奎倪洪运任树洋孙建新曹智勇刘殿山
Owner TONGYU HEAVY IND
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