Integral seal punch molding method of nuclear power pressure container

A stamping forming and pressure vessel technology, which is applied in the field of stamping forming of the integrated head of the pressure vessel used in nuclear power, can solve the problems of poor quality stability in the stress area, rising manufacturing costs, complicated welding process, etc., and achieve stable comprehensive mechanical properties and eliminate Internal stress, improve the effect of comprehensive mechanical properties

Inactive Publication Date: 2016-11-02
SHANGHAI XINMIN DONGTAI HEAVY FORGING
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the head of the steam generator is provided with two pipe hole seats and two manhole seats on the main body of the hemispherical crown; and it needs to be integrally forged on such a large-sized spherical crown at one time to meet the size requirements and position requirements. The tube hole seat and manhole seat are even more difficult to achieve
[0004] The existing head is manufactured by splicing the head body, the manhole seat and the pipe hole seat by welding. Although with the development of material science, the performance of welding materials has been greatly improved, and new welding processes have emerged in an endless stream. , but the welded structure between the main body of the head, the manhole seat and the nozzle hole seat cannot always form a complete metal flow line. Because the nuclear power steam generator has been in the harsh operating environment of high temperature and high pressure for a long time, and is subject to alternating The sudden change of pressure formed by the load and the eddy current of the pipeline can easily cause uneven stress distribution and stress concentration, and easily cause fatigue, creep and damage
Moreover, in the method of separately welding and manufacturing the spherical crown and the nozzle, the welding process is very complicated, the welding cycle is long, and the quality stability of the complex stress area is poor, which directly leads to low yield and a substantial increase in manufacturing costs.
It is very difficult to integrally forge the steam generator head, and the process must first forge a thick disc-shaped head slab, and then forge and stamp out the near-final spherical crown head, and forging stamping has a large The amount of deformation and the spherical head with complex curved surface are the difficulties and keys of the whole process

Method used

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  • Integral seal punch molding method of nuclear power pressure container
  • Integral seal punch molding method of nuclear power pressure container
  • Integral seal punch molding method of nuclear power pressure container

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Experimental program
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Effect test

Embodiment 1

[0030] In this process step, firstly select such as figure 2 , image 3 and Figure 4 As shown in the head slab, the material of the head slab is 508-3 steel.

[0031] Rough processing of slab: Carry out preliminary machining on the head slab to facilitate the rough forming of the next head. First, the outer periphery of the slab is turned to remove the burr and concave-convex surface of the slab to form a circular plate-shaped slab; milling is used The four conical surfaces and the end faces of the four circular platforms on the reverse side of the head slab are machined by other machining methods; the front of the slab is turned by turning and other machining methods to form a circular table with a large cone angle on the front of the slab. The conical angle of the conical table is controlled at 170°-175°, and the conical angle of the conical table is the angle between the two busbars on the same plane. The ratio of the upper and lower diameter φ1 of the large cone angle...

Embodiment 2

[0040] Still choose to have in this embodiment figure 2 , image 3 and Figure 4 For the head slab of the structural shape shown, the material of the head slab is still 508-3 steel, but the outer dimension and weight of the head slab in this embodiment are larger than the head slab in Embodiment 1.

[0041] Rough machining of the slab: firstly, the outer periphery of the slab is turned to remove the burr and concave-convex surface of the slab, thereby forming a circular plate-shaped slab; using milling and other machining methods to machine the four conical surfaces and Its end face; the front of the slab is turned by turning and other machining methods to form a circular table surface with a large cone angle on the front of the slab. The cone angle of the circular table is controlled at 170°-175°. The slab body of the head slab The ratio of the upper and bottom diameter φ1 of the upper large cone angle circular table to the outer diameter φ of the slab main body is: φ1 / φ=1...

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Abstract

The invention discloses an integral seal punch molding method of a nuclear power pressure container. The punch molding method comprises the following steps: roughening of a plate blank: the heated seal plate blank is machined; heating of the plate blank: the roughened seal plate blank is sent in a heating furnace for heating; molding of a seal: the seal plate blank is shifted to an annular mold with a center hole for punching to mold a semi-spherical seal blank; punching of the seal: a seal punching part with two man holes and two pipe holes is punched; heat treatment of the punched part: the punched part is discharged from a furnace for air cooling when being cooled to 180 DEG C along with the furnace after autoclaving; machining of the punched part: the heated seal punched part is machined as a seal rough finished product; performance heat treatment: the quenching treatment is performed firstly; and then, the thermal refining is performed; and the finished product is machined to a qualified seal finished product. The method realizes integral molding of a steam generator seal, and is uniform and compact in metal structure and complete in streamline.

Description

technical field [0001] The invention relates to a forging forming process of a large structural part for nuclear power equipment, in particular to a stamping forming method for an integrated head of a nuclear power pressure vessel. Background technique [0002] The pressurized water reactor nuclear power plant is mainly composed of nuclear island and conventional island. The four major components of the nuclear island of the pressurized water reactor nuclear power plant are the steam generator, voltage stabilizer, main pump and core, so the nuclear steam generator is the most critical main equipment of the nuclear power plant. , the steam generator is connected to the reactor pressure vessel, which not only directly affects the power and efficiency of the power station, but also plays a role in blocking radioactive heat transfer agents during heat exchange, which is crucial to the safety of nuclear power plants. Its materials and manufacturing are high The technical content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D51/44B21D35/00B21D37/16B23P15/00C21D9/00
CPCB21D51/44B21D35/002B21D37/16B23P15/00C21D9/00
Inventor 马武江王兴中周怡君周佳恺邓春华任茂荣
Owner SHANGHAI XINMIN DONGTAI HEAVY FORGING
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