CN109834208B - Top cover forging method of nuclear power pressure vessel - Google Patents

Top cover forging method of nuclear power pressure vessel Download PDF

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Publication number
CN109834208B
CN109834208B CN201711212659.3A CN201711212659A CN109834208B CN 109834208 B CN109834208 B CN 109834208B CN 201711212659 A CN201711212659 A CN 201711212659A CN 109834208 B CN109834208 B CN 109834208B
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cover
forging
ingot
die
billet
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CN109834208A (en
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董凯
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Shanghai Electric Shmp Casting & Forging Co ltd
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Shanghai Electric Shmp Casting & Forging Co ltd
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Abstract

The invention provides a top cover forging method of a nuclear power pressure vessel, which comprises the steps of firstly forging a steel ingot into a blank with a certain size, and then carrying out large-deformation upsetting, rotary upsetting stripping and stamping preforming in a certain die; then, rolling the blank by adopting a first set of finish forming die to enable the inclined plane part of the blank to generate metal two-way flow, and prefabricating a part of boss; and then, a second set of final forming die is adopted, a rotary anvil is used for rolling, the spherical shell is elongated, metal continues to flow towards the position of the boss, the boss of the nozzle is extruded, and the requirement of the forging on the technological dimension is met. The solution considers the molding of the special-shaped forge piece and the condition of the crystal grains molded by the lug boss. Namely, the boss stepped forming method is adopted to ensure that the boss generates deformation in two fire times, and abnormal growth of crystal grains caused by no deformation of a plurality of fire times is prevented.

Description

Top cover forging method of nuclear power pressure vessel
Technical Field
The invention relates to the field of metal material forging, in particular to a top cover forging method of a nuclear power pressure vessel.
Background
The AP1000 nuclear power system is a third-generation nuclear power system introduced from West House company in China, has the characteristics of advanced technology, high efficiency, good safety performance and the like, is a main stack type developed in the next decades of China, and the integrated top cover is an important forging in a pressure container.
As shown in fig. 1 to 4, a conventional method for forming a top cover of an AP1000 includes: a round slab is forged (shown in fig. 1), preformed in a mold (shown in fig. 2), and then rolled in a mold (shown in fig. 3 and 4). The forming method only considers the forming of the cap, and the nozzle is formed in a subsequent step by a build-up welding method, as shown in fig. 5. The method needs welding evaluation before welding, and has the advantages of strict detection on welding seams, long manufacturing period and high cost.
Disclosure of Invention
The invention aims to solve the technical problem that a top cover forging method of a nuclear power pressure vessel is needed to reduce equipment welding seams and in-service inspection workload and improve the safety and reliability of a nuclear power station.
In order to solve the technical problem, the invention provides a top cover forging method of a nuclear power pressure vessel, which comprises the following steps:
step one, hot feeding steel ingots to a cutting cap, and burning off T shoulders;
step two, gradually pressing a clamp handle at the bottom of the steel ingot;
step three, carrying out wide anvil forced square drawing on the steel ingot, and compacting the center;
fourthly, upsetting the billet obtained in the third step, strongly drawing the billet by a wide anvil, and compacting the billet by the center;
fifthly, drawing and cogging the billet subjected to the upsetting step IV;
sixthly, placing the steel billet obtained in the fifth step in a first lower die for upsetting, and adopting an upper anvil for rotary upsetting stripping; the shape of the billet after the step is an inverted trapezoidal body with a boss at the bottom;
step seven, stamping the steel blank obtained in the step six by using a first upper die, and stamping a pit on the upper part of the steel blank and simultaneously attaching the outer side of the steel blank to a first lower die;
step eight, placing the steel billet obtained in the step seven into a second lower die, and simultaneously rolling and preforming by adopting a second upper die;
and step nine, rolling and molding the steel billet obtained in the step eight by adopting a third upper die, and finishing the flattening of the flange, wherein the outline shape of the third upper die is matched with the cross section shape of the inner cavity of the finally molded top cover, the finally molded top cover comprises a hemispherical top cover body, a boss and a flange, the diameter of the flange is 4950-5100 mm, the height of the flange is 950-1100 mm, the diameter of the boss at the bottom of the top cover is 3450-3750 mm, and the height of the boss is 850 mm.
Preferably, the ingot body of the steel ingot after the second step is a conical round table body, the diameter of the top of the ingot body is 3564 mm, the diameter of the bottom of the ingot body is 2750 mm, the height of the ingot body is 4120 mm, the diameter of the clamp handle is 1470 mm, and the length of the clamp handle is 1400 mm.
Preferably, the ingot body width of the ingot after the third step is 2600 mm.
Preferably, in the fourth step, the diameter of the ingot body after upsetting the billet is 3900 mm, and the width of the ingot body after drawing is 2600 mm.
Preferably, in the fifth step, the diameter of the ingot body after upsetting of the steel blank is 3900 mm, and the diameter of the ingot body after drawing is 2850 mm.
Preferably, in the sixth step, the steel blank is subjected to overall upsetting with large deformation of more than 50%, and then is subjected to rotary upsetting with large anvil feeding amount by using an upper anvil with the width of 1600 mm.
Preferably, the billet after the seventh step has a diameter of 4700 mm and a height of 1900 mm.
Preferably, the inner surface of the second lower mold in the eighth step is shaped like a hemisphere with steps.
Preferably, the second upper die in the step eight is a strip-shaped anvil with a circular arc straightening section.
Preferably, step nine is divided into two fires, one for each of steps one through eight.
Firstly, forging a steel ingot into a blank with a certain size, and then performing large-deformation upsetting, rotary upsetting stripping and stamping preforming in a certain die; then, rolling the blank by adopting a first set of finish forming die as shown in figure 14 to enable the inclined plane part of the blank to generate metal two-way flow, and prefabricating a part of lug boss; and then, a second set of final forming die shown in the figure 15 is adopted, a rotary anvil is used for rolling, the spherical shell is elongated, metal continues to flow to the position of the boss, the boss of the nozzle is extruded, and the forge piece is ensured to meet the technological dimension requirement. The solution considers the molding of the special-shaped forge piece and the condition of the crystal grains molded by the lug boss. Namely, the boss stepped forming method is adopted to ensure that the boss generates deformation in two fire times, and abnormal growth of crystal grains caused by no deformation of a plurality of fire times is prevented.
Drawings
FIGS. 1-5 illustrate a method of forging a top cover of a prior art nuclear power pressure vessel.
FIGS. 6-15 are schematic diagrams illustrating steps of a top cover forging method for a nuclear power pressure vessel according to the present invention.
Description of the reference numerals
1 first lower die 2 first upper die
3 second upper die 4 second lower die
5 third upper die 6 boss
7 flange 8 roof body
Detailed Description
The top cover forging method of the nuclear power pressure vessel is used for manufacturing the AP1000 top cover and comprises the following steps:
step one, the steel ingot is hot-fed to a top and the T shoulder is burned off. The forged steel ingot consists of a riser, an ingot body and an ingot tail, wherein the riser is in a circular truncated cone shape with a small upper part and a large lower part, the ingot body is the main body of the steel ingot, and the rest ingot body parts are forged into a forging piece in the forging process except for cutting off a few materials at the riser end and the nozzle end and the fire loss.
And step two, gradually pressing the clamp handle at the bottom of the steel ingot. The bottom is forged into a pliers grip during forging for holding during forging operation. And FIG. 7 shows the shape of the steel ingot after the second step, wherein the body of the steel ingot is a conical frustum body, the width of the top of the body is 3564 mm, the width of the bottom of the body is 2750 mm, the height of the body is 4120 mm, the diameter of the clamp handle is 1470 mm, and the length of the clamp handle is 1400 mm.
And step three, strongly pressing and drawing the wide anvil, and compacting the center. As shown in fig. 8, the ingot width of the billet obtained in step three is 2600 mm.
And fourthly, upsetting the billet obtained in the third step, strongly pressing and drawing the billet by a wide anvil, and compacting the billet by the center. In the fourth step shown in FIG. 9, the diameter of the ingot body after upsetting the billet is 3900 mm, and the width of the ingot body after drawing is 2600 mm.
And step five, drawing and cogging the steel billet subjected to the upsetting step four. As shown in FIG. 10, in the fifth step, the diameter of the upset ingot body is 3900 mm, and the diameter of the ingot body is 2850 mm.
Sixthly, as shown in fig. 11, placing the billet obtained in the fifth step in a first lower die for upsetting, and adopting an upper anvil with the width of 1600mm to carry out rotary upsetting with large anvil feeding amount; the billet after the step is in the shape of an inverted trapezoid with a boss at the bottom.
And step seven, as shown in fig. 12, stamping the billet obtained in the step six by using a first upper die, and stamping a pit on the upper part of the billet and simultaneously attaching the outer side of the billet to the first lower die. The shape of the billet after this step is 4700 mm in diameter and 1900 mm in height, as shown in FIG. 13.
And step eight, placing the billet obtained in the step seven into a second lower die, and simultaneously rolling and preforming by adopting a second upper die. As shown in fig. 14, the inner surface of the second lower die is shaped like a hemisphere with steps, and the second upper die is a bar-shaped anvil with a circular arc-shaped straight section.
And step nine, rolling and molding the steel blank obtained in the step eight by adopting a third upper die, and finishing the flattening of the flange, wherein the third upper die is a sheet anvil with a certain thickness, and the shape of the outer surface of the third upper die is matched with the shape of the section of the inner surface of the finally molded top cover. As shown in fig. 15.
The shape of the final formed top cap is shown in fig. 6, and comprises a hemispherical top cap body, a boss and a flange, wherein the diameter of the flange is 4950 mm-5100 mm, the height of the flange is 950 mm-1100 mm, the diameter of the boss at the bottom of the top cap is 3450 mm-3750 mm, and the height of the boss is 850 mm.
In the above steps, the ninth step is divided into two fire times, and each of the first to eighth steps is one fire time.
The invention prepares the blank by the modes of twice upsetting, twice drawing out and twice central compacting, and the nozzle lug boss is subjected to multi-fire metal flow forming under a preset state by rotating and rolling, thereby ensuring the forming size and refining the grains. Enough deformation is left before the flange is finished, and the flange is flattened after the boss of the pipe nozzle is rolled and formed, so that the purpose of grain refinement is achieved. Meanwhile, the invention forms the pipe nozzle boss in the die forging by the prefabricated blank, so that the integrated top cover with the pipe nozzle boss can be integrally formed and meets the technical requirements of the forged piece. The method can enable the shape and the size of the forging to be close to the final size of the product to the maximum extent, improves the material utilization rate of the forging, and reduces the surfacing and processing working hours (generally 3 months) and the manufacturing cost of the product because the nozzle lug boss is not formed by surfacing.

Claims (10)

1. A top cover forging method of a nuclear power pressure vessel is characterized in that the method is used for manufacturing a top cover of AP1000, and comprises the following steps:
step one, hot feeding steel ingots to a cutting cap, and burning off T shoulders;
step two, gradually pressing a clamp handle at the bottom of the steel ingot;
step three, carrying out wide anvil forced square drawing on the steel ingot, and compacting the center;
fourthly, upsetting the billet obtained in the third step, strongly drawing the billet by a wide anvil, and compacting the billet by the center;
fifthly, drawing and cogging the billet subjected to the upsetting step IV;
sixthly, placing the steel billet obtained in the fifth step in a first lower die for upsetting, and adopting an upper anvil for rotary upsetting stripping; the shape of the billet after the step is an inverted trapezoidal body with a boss at the bottom;
step seven, stamping the steel blank obtained in the step six by using a first upper die, and stamping a pit on the upper part of the steel blank and simultaneously attaching the outer side of the steel blank to a first lower die;
step eight, placing the steel billet obtained in the step seven into a second lower die, and simultaneously rolling and preforming by adopting a second upper die;
and step nine, rolling and molding the steel billet obtained in the step eight by adopting a third upper die, and finishing the flattening of the flange, wherein the outline shape of the third upper die is matched with the cross section shape of the inner cavity of the finally molded top cover, the finally molded top cover comprises a hemispherical top cover body, a boss and a flange, the diameter of the flange is 4950-5100 mm, the height of the flange is 950-1100 mm, the diameter of the boss at the bottom of the top cover is 3450-3750 mm, and the height of the boss is 850 mm.
2. The method for forging the top cover of the nuclear power pressure vessel as claimed in claim 1, wherein the ingot body of the steel ingot after the second step is a conical frustum body, the diameter of the top of the ingot body is 3564 mm, the diameter of the bottom of the ingot body is 2750 mm, the height of the ingot body is 4120 mm, the diameter of the clamp handle is 1470 mm, and the length of the clamp handle is 1400 mm.
3. The method for forging a top cover of a nuclear power pressure vessel as claimed in claim 2, wherein the ingot body width of the billet obtained in the third step is 2600 mm.
4. The method for forging a top cover of a nuclear power pressure vessel as claimed in claim 3, wherein in the fourth step, the diameter of the ingot body after upsetting of the billet is 3900 mm, and the width of the ingot body after drawing is 2600 mm.
5. The method for forging the top cover of the nuclear power pressure vessel as claimed in claim 4, wherein in the fifth step, the diameter of the ingot body after upsetting of the steel blank is 3900 mm, and the diameter of the ingot body after drawing is 2850 mm.
6. The method for forging a top cover of a nuclear power pressure vessel as claimed in claim 5, wherein in the sixth step, the steel blank is subjected to integral upsetting with large deformation of more than 50%, and then is subjected to rotary upsetting stripping by using an upper anvil with a width of 1600 mm.
7. The method of forging a top cover of a nuclear power pressure vessel as claimed in claim 6, wherein the billet after step seven has a diameter of 4700 mm and a height of 1900 mm.
8. The method for forging a top cover of a nuclear power pressure vessel as claimed in claim 7, wherein the inner surface of the second lower die in the step eight is formed in a hemispherical shape with steps.
9. The method for forging a top cover of a nuclear power pressure vessel as claimed in claim 7, wherein the second upper die in the step eight is a bar-shaped anvil with a circular arc-shaped straight section.
10. A method for forging a top cover of a nuclear power pressure vessel as claimed in any one of claims 1 to 9, wherein step nine is divided into two fire passes, and each of steps one to eight is one fire pass.
CN201711212659.3A 2017-11-28 2017-11-28 Top cover forging method of nuclear power pressure vessel Active CN109834208B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110523876A (en) * 2019-10-08 2019-12-03 上海电气上重铸锻有限公司 Nuclear pressure container bottom (head), changeover portion integration press-processing method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548894B2 (en) * 1978-03-27 1980-12-09
CN1109392A (en) * 1993-11-10 1995-10-04 雷斯工程株式会社 Rotary forging apparatus
CN101147951A (en) * 2007-11-13 2008-03-26 成都市新筑路桥机械股份有限公司 Rolling preparation method for thick-walled and thin-bottomed basin parts
CN102554088A (en) * 2010-12-10 2012-07-11 上海重型机器厂有限公司 Forging method for pressure vessel bottom head transition section of second-generation nuclear power station and mould
CN104550624A (en) * 2013-10-22 2015-04-29 中国第一重型机械股份公司 Near-net forming forging method of integrated bottom head of nuclear reactor pressure vessel
CN107252866A (en) * 2017-06-08 2017-10-17 四川理工学院 The multiple protrusion ozzle large-sized end enclosure forging integral forging and forming methods of nuclear reactor band

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548894B2 (en) * 1978-03-27 1980-12-09
CN1109392A (en) * 1993-11-10 1995-10-04 雷斯工程株式会社 Rotary forging apparatus
CN101147951A (en) * 2007-11-13 2008-03-26 成都市新筑路桥机械股份有限公司 Rolling preparation method for thick-walled and thin-bottomed basin parts
CN102554088A (en) * 2010-12-10 2012-07-11 上海重型机器厂有限公司 Forging method for pressure vessel bottom head transition section of second-generation nuclear power station and mould
CN104550624A (en) * 2013-10-22 2015-04-29 中国第一重型机械股份公司 Near-net forming forging method of integrated bottom head of nuclear reactor pressure vessel
CN107252866A (en) * 2017-06-08 2017-10-17 四川理工学院 The multiple protrusion ozzle large-sized end enclosure forging integral forging and forming methods of nuclear reactor band

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