CN110538952A - Manufacturing method and forming die of corrugated ring for nuclear power reactor internals - Google Patents
Manufacturing method and forming die of corrugated ring for nuclear power reactor internals Download PDFInfo
- Publication number
- CN110538952A CN110538952A CN201910928384.6A CN201910928384A CN110538952A CN 110538952 A CN110538952 A CN 110538952A CN 201910928384 A CN201910928384 A CN 201910928384A CN 110538952 A CN110538952 A CN 110538952A
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- ring
- forming die
- forging blank
- blank
- shaped
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000005242 forging Methods 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims 6
- 238000003754 machining Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
Abstract
The invention discloses a method for manufacturing a corrugated ring for a nuclear power reactor internals and a forming die, which comprises an upper forming die and a lower forming die, wherein the upper forming die and the lower forming die are both in a cylindrical structure, an upper wavy surface is arranged at the lower end of the upper forming die, a lower wavy surface matched with the upper wavy surface is arranged at the upper end of the lower forming die, upper lug plates and lower lug plates are symmetrically arranged on the outer walls of the upper forming die and the lower forming die respectively, guide columns are fixed on the lower lug plates, and the guide columns are in sliding fit with guide holes in the upper lug plates. The invention can forge thin and wavy forgings of different materials and sizes, the fiber direction of the forgings is distributed along with the shape and is complete, the forgings are safe and reliable, the forgings have the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, the machining excess material is small, the materials are saved, the machining period is short, and the manufacturing cost is low.
Description
Technical Field
The invention relates to a method for manufacturing a corrugated ring for a nuclear reactor internals and a forming die, belonging to the technical field of forging construction.
Background
The wavy ring is a wavy structural member with thin thickness used for the reactor internals of nuclear equipment, and has very high requirements on high temperature resistance, high pressure resistance, corrosion resistance, low internal defect and comprehensive mechanical property. The traditional manufacturing method of the corrugated ring is generally to form the corrugated ring by forging a thick forge piece, then mill the upper end surface and the lower end surface, and then turn the redundant internal allowance; or formed by casting. The existing product produced by adopting a forging mode not only reduces the comprehensive mechanical property and the service life of the product because the fiber direction in the forging piece is cut off, but also needs a large amount of time for machining because the machining allowance is too large, and simultaneously causes the waste of raw materials; the molding by adopting the casting mode has the problem of uneven distribution of material tissues, so that the comprehensive mechanical property cannot meet the manufacturing requirement of the pressure container. The two methods are both made by removing redundant metal through machining, the machining allowance is large, the machining period is long, the material waste is large, and the manufacturing cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for manufacturing a corrugated ring for a nuclear power reactor internals and a forming die.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for manufacturing a corrugated ring for a nuclear power reactor internals includes the steps of firstly forging a forging blank on a free forging press to obtain a blank, drawing and upsetting the blank by using upper and lower flat anvils until the blank is upset into a cake-shaped forging, punching out the circle center area of the cake-shaped forging by using a punch, then continuously reaming by using a bumper and a mandrel until the annular forging blank is formed, then placing the annular forging blank into a ring rolling mill to perform ring rolling preforming, after the ring rolling preforming of the annular forging blank is finished, placing the annular forging blank into a sawing machine, sawing the annular forging blank along the diameter direction of the annular forging blank according to the thickness of a final forging, then returning the sawed annular forging blank to a furnace to heat the annular forging blank, ensuring that the heating temperature is not higher than 1050 ℃, preserving heat for a certain time, and finally upsetting and forming the heated annular forging blank through a forming die.
In the method, during ring rolling, firstly heating the ring-shaped forging blank after hole expansion to 850-1100 ℃ and preserving heat for a certain time, then sleeving the ring-shaped forging blank into a core roller of a ring rolling mill, moving the core roller along the diameter direction of the ring-shaped forging to drive the ring-shaped forging blank to be in contact with a main roller and to be positioned and compressed, then holding the outer circumferential surface of the ring-shaped forging blank tightly by a left holding roller and a right holding roller to prevent the rolling bending or rolling phenomenon in the rolling process, and then respectively enabling an upper conical roller and a lower conical roller to be tangent with the upper end surface and the lower end surface of the ring-shaped forging blank so as to control the height of a ring; the driving of the main roller drives the annular forging blank to rotate, meanwhile, the core roller performs radial feeding along the diameter direction of the annular forging, the wall thickness of the annular forging blank becomes thinner piece by piece, the height of the ring is controlled by the upper conical roller and the lower conical roller, and ring grinding preforming is performed on the blank gradually in the rotating process of the blank.
In the method, the forging blank is heated to 850-1150 ℃ and then repeatedly forged and pressed on a free forging press for many times.
In the method, when the sawn annular forging blank is upset by using the forming die, the forming die is preheated to 250-350 ℃, and a release agent is coated.
meanwhile, the invention also provides a corrugated ring forming die for the nuclear power reactor internals used in the method, which comprises an upper forming die and a lower forming die, wherein the upper forming die and the lower forming die are both in cylindrical structures, the lower end of the upper forming die is provided with an upper wavy profile, the upper end of the lower forming die is provided with a lower wavy profile matched with the upper wavy profile, the outer walls of the upper forming die and the lower forming die are respectively and symmetrically provided with an upper lug plate and a lower lug plate, the lower lug plate is fixed with a guide post, and the guide post is in sliding fit with a guide hole on the upper lug plate.
Furthermore, the center lines of the upper forming die and the lower forming die are concentric, and a center sleeve is connected in the upper forming die and the lower forming die in a sliding mode.
Furthermore, a support plate is arranged in the central sleeve.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention can forge thin and wavy forgings of different materials and sizes, the fiber direction of the forgings is distributed along with the shape and is complete, the forgings are safe and reliable, the forgings have the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, the machining excess material is small, the materials are saved, the machining period is short, and the manufacturing cost is low.
Drawings
FIG. 1 is a schematic structural view of a forming mold according to the present invention;
FIG. 2 is a schematic view of the construction of the center sleeve;
FIG. 3 is a cross-sectional view C-C of FIG. 2;
FIG. 4 is a schematic structural diagram of a circular ring-shaped forging blank punched by a punch;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a schematic diagram of a ring rolling process;
FIG. 7 is a schematic structural diagram of a sawn circular ring-shaped forging blank;
FIG. 8 is a cross-sectional view B-B of FIG. 7;
FIG. 9 is a perspective view of the wave shaped ring after final forming;
FIG. 10 is a top view of the final formed undulating ring.
Description of reference numerals: 1-forming an upper die, 2-forming a lower die, 3-a guide column, 4-a central sleeve, 5-a circular forging blank, 6-an upper lug plate, 7-a lower lug plate, 8-a guide hole, 9-an upper wavy profile, 10-a lower wavy profile, 11-a core roller, 12-a main roller, 13-a holding roller, 14-a conical roller and 15-a support plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention comprises the following steps: the structural schematic diagram of the wave-shaped ring forming die for the nuclear power reactor internals is shown in fig. 1-3, and comprises a forming upper die 1 and a forming lower die 2, the forming upper die 1 and the forming lower die 2 are both in a cylindrical structure, the lower end of the forming upper die 1 is provided with an upper wave profile 9, the upper end of the forming lower die 2 is provided with a lower wave profile 10 matched with the upper wave profile 9, the outer walls of the forming upper die 1 and the forming lower die 2 are respectively and symmetrically provided with an upper lug plate 6 and a lower lug plate 7, a guide post 3 is fixed on the lower lug plate 7, and the guide post 3 is in sliding fit with a guide hole 8 on the upper lug plate 6. The center lines of the upper forming die 1 and the lower forming die 2 are concentric, a center sleeve 4 is connected in the upper forming die 1 and the lower forming die 2 in a sliding mode, and a supporting plate 15 is arranged in the center sleeve 4.
The manufacturing method of the corrugated ring for the nuclear reactor internals comprises the following steps:
step one, heating the steel ingot refined outside the electric furnace to 900 ℃, repeatedly forging and pressing the steel ingot to change the organization state of the steel ingot, welding internal defects, drawing and upsetting the steel ingot by using upper and lower flat anvils to form a round cake-shaped forging, punching and cutting the circle center area of the round cake-shaped forging by using a punch, and then continuing to perform hole expansion by using a bar and a core rod until a circular ring-shaped forging blank 5 shown in figures 4 and 5 is formed.
step two, referring to fig. 6, heating the ring-shaped forged blank 5 after hole expansion to 1000 ℃ and preserving heat for 45min, then sleeving the ring-shaped forged blank 5 after hole expansion into a core roller 11 of the ring rolling mill, moving the core roller 11 along the diameter direction of the ring-shaped forged blank 5 to drive the ring-shaped forged blank 5 to be in contact with a main roller 12 and to be positioned and compressed, then holding the outer circumferential surface of the ring-shaped forged blank 5 tightly by a left holding roller 13 and a right holding roller 13 to prevent the rolling bending or rolling phenomenon in the rolling process, and then respectively enabling an upper conical roller 14 and a lower conical roller 14 to be tangent to the upper end surface and the lower end surface of the ring-shaped forged blank 5 so as to control the height. The driving of the main roller 12 drives the circular ring-shaped forging blank 5 to rotate, and meanwhile, the core roller 11, the holding roller 13 and the conical roller 14 are in contact with the circular ring-shaped forging blank 5 to rotate. In addition, the core roller 11 is fed in the radial direction along the diameter direction of the annular forging blank 5, so that the wall thickness of the annular forging blank 5 is thinned piece by piece, the height of the annular forging blank 5 is controlled by the upper and lower conical rollers 14, and the annular forging blank 5 is subjected to ring grinding preforming gradually in the rotation process of the annular forging blank 5.
And step three, after ring rolling preforming of the circular ring-shaped forging blank 5 is finished, placing the circular ring-shaped forging blank 5 into a sawing machine, sawing along the diameter direction of the circular ring-shaped forging blank 5 according to the thickness of the final forging to obtain the circular ring-shaped forging blank 5 shown in the figures 7 and 8, and then, returning the sawn circular ring-shaped forging blank 5 to the furnace for heating.
and step four, referring to fig. 1, after the sawing of the annular forging blank 5 is finished, returning the annular forging blank to the furnace for heating, wherein the heating temperature is 980 ℃, keeping the temperature for 30min, simultaneously preheating the upper forming die 1, the lower forming die 2 and the central sleeve 4 to 320 ℃, and coating a release agent. Then the lower forming die 2 is sleeved into the central sleeve 4, then the upper forming die 1 and the lower forming die 2 are integrally moved to a working platform of a hydraulic press and positioned right below an upper anvil of the hydraulic press, and then the guide posts 3 on the lower forming die 2 are inserted into the guide holes 8 on the upper forming die 1, so that the upper forming die 1 and the lower forming die 2 are connected together, then the heated and fully insulated annular forging blank 5 is put into a lower forming die, simultaneously an upper forming die 1 is clamped by an operating machine and sleeved into a central sleeve 4, the upper forming die 1 is pressed by an upper anvil of a hydraulic press at the position of the circle center of the sawn annular forging blank 5, the upper wavy molded surface 9 and the lower wavy molded surface 10 on the upper forming die 1 and the lower forming die 2 are used for pressing the annular forging blank 5, thereby upsetting the annular forging blank 5 and ultimately achieving the desired size of the wave shaped ring (as shown in fig. 9 and 10). In the blank forming process, the upper forming die 1 and the lower forming die 2 need to be stressed uniformly, so that the forging flow line of the corrugated ring for the nuclear power reactor internal member is uniform, and the excellent comprehensive mechanical property of the corrugated ring is ensured. After the corrugated ring is forged, the corrugated ring is subjected to performance heat treatment, integrates mechanical properties, macroscopical and microscopic structures, resists corrosion, has a complete forging flow line, and is machined by small allowance to form the corrugated ring for the nuclear power reactor internal member.
Claims (7)
1. A method for manufacturing a corrugated ring for a nuclear reactor internals is characterized in that: firstly forging and removing a forging blank on a free forging press, drawing and upsetting by using an upper flat anvil and a lower flat anvil until the forging blank is upset into a cake-shaped forging, then punching off the circle center area of the cake-shaped forging by using a punch, then continuously reaming by using a feed bar and a core rod until a circular ring-shaped forging blank is formed, then placing the circular ring-shaped forging blank into a ring rolling mill for ring rolling preforming, after ring rolling preforming of the circular ring-shaped forging blank is finished, placing the circular ring-shaped forging blank into a sawing machine, sawing the circular ring-shaped forging blank along the diameter direction of the circular ring-shaped forging blank according to the final thickness of the forging, then returning the sawed circular ring-shaped forging blank into the furnace for heating, ensuring that the heating temperature is not higher than 1050 ℃, preserving the temperature for a certain time, and finally upsetting and forming the heated circular ring.
2. A method of manufacturing a corrugated ring for a nuclear reactor internals according to claim 1, characterized in that: when ring rolling is carried out, firstly heating the ring-shaped forging blank after hole expansion to 850-1100 ℃ and preserving heat for a certain time, then sleeving the ring-shaped forging blank into a core roller of a ring rolling mill, moving the core roller along the diameter direction of the ring-shaped forging to drive the ring-shaped forging blank to be in contact with a main roller and to be positioned and compressed, then holding the outer circumferential surface of the ring-shaped forging blank by a left holding roller and a right holding roller to prevent the rolling bending or rolling phenomenon in the rolling process, and then respectively tangent with the upper end surface and the lower end surface of the ring-shaped forging blank by an upper conical roller and a lower conical roller so as to control the height of a ring; the driving of the main roller drives the annular forging blank to rotate, meanwhile, the core roller performs radial feeding along the diameter direction of the annular forging, the wall thickness of the annular forging blank becomes thinner piece by piece, the height of the ring is controlled by the upper conical roller and the lower conical roller, and ring grinding preforming is performed on the blank gradually in the rotating process of the blank.
3. A method of manufacturing a corrugated ring for a nuclear reactor internals according to claim 1, characterized in that: and the forging blank is heated to 850-1150 ℃ and then repeatedly forged and pressed on a free forging press for many times.
4. a method of manufacturing a corrugated ring for a nuclear reactor internals according to claim 1, characterized in that: when the sawn annular forging blank is upset by adopting a forming die, the forming die is preheated to 250-350 ℃, and a release agent is coated.
5. a corrugated ring forming die for a nuclear power reactor internals used in the method of any one of claims 1 to 4, comprising an upper forming die (1) and a lower forming die (2), and is characterized in that: mould (1) and shaping lower mould (2) are the cylinder structure on the shaping, the lower extreme of mould (1) is provided with wave profile (9) on the shaping, be provided with in the upper end of shaping lower mould (2) with last wave profile (9) anastomotic lower wave profile (10), be provided with otic placode (6) and lower otic placode (7) on the outer wall of mould (1) and shaping lower mould (2) on the shaping respectively symmetrically, be fixed with guide post (3) on otic placode (7) down, guide post (3) and guiding hole (8) sliding fit on last otic placode (6).
6. A wave shaped ring forming die for nuclear power reactor internals according to claim 5, characterized in that: the central lines of the upper forming die (1) and the lower forming die (2) are concentric, and a central sleeve (4) is connected in the upper forming die (1) and the lower forming die (2) in a sliding mode.
7. a wave shaped ring forming die for nuclear power reactor internals according to claim 6, characterized in that: a supporting plate (15) is arranged in the central sleeve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928384.6A CN110538952A (en) | 2019-09-28 | 2019-09-28 | Manufacturing method and forming die of corrugated ring for nuclear power reactor internals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910928384.6A CN110538952A (en) | 2019-09-28 | 2019-09-28 | Manufacturing method and forming die of corrugated ring for nuclear power reactor internals |
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| CN110538952A true CN110538952A (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910928384.6A Pending CN110538952A (en) | 2019-09-28 | 2019-09-28 | Manufacturing method and forming die of corrugated ring for nuclear power reactor internals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112705656A (en) * | 2020-11-12 | 2021-04-27 | 贵阳安大宇航材料工程有限公司 | H13E shield hob ring forming process |
| CN114178781A (en) * | 2021-10-13 | 2022-03-15 | 贵州航天精工制造有限公司 | Method for manufacturing gasket fixing clamp for reactor pressure vessel |
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| CN114178781A (en) * | 2021-10-13 | 2022-03-15 | 贵州航天精工制造有限公司 | Method for manufacturing gasket fixing clamp for reactor pressure vessel |
| CN114178781B (en) * | 2021-10-13 | 2024-03-01 | 贵州航天精工制造有限公司 | Method for manufacturing gasket fixing clamp for reactor pressure vessel |
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