CN113118374A - Reaction kettle forging method - Google Patents
Reaction kettle forging method Download PDFInfo
- Publication number
- CN113118374A CN113118374A CN201911417637.XA CN201911417637A CN113118374A CN 113118374 A CN113118374 A CN 113118374A CN 201911417637 A CN201911417637 A CN 201911417637A CN 113118374 A CN113118374 A CN 113118374A
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- Prior art keywords
- forging
- die
- reaction kettle
- reactor
- blank
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- 238000005242 forging Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000003754 machining Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000006104 solid solution Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- 238000005728 strengthening Methods 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000047 product Substances 0.000 claims 2
- 239000012467 final product Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- DBUTVDSHVUGWOZ-UHFFFAOYSA-N [Si].[Ni].[Cr].[Ni] Chemical compound [Si].[Ni].[Cr].[Ni] DBUTVDSHVUGWOZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001119 inconels 625 Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
-
- 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
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
Abstract
The invention discloses a reaction kettle forging method, which comprises the following steps: manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure; obtaining a steel ingot by adopting an electric furnace and electroslag remelting process; primarily forging the steel ingot to obtain a die forging blank; placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity; machining the initial part of the kettle body to obtain a finished product of the reaction kettle; the method is different from the method of machining the inner cavity of the autoclave body in the past, the blind holes are punched by the punch, the material is reversely extruded and formed in the die, the metal fiber texture of the forged piece is continuous, and the performance uniformity and the safety of the autoclave body are improved; the shape and the size of the forging are closer to those of a final finished product by using a die forging method, the consumption of raw materials is reduced, and the processing period can be shortened. The die forging die is simple, can be repeatedly used, has high forming efficiency and improves the production efficiency.
Description
Technical Field
The invention relates to the field of reaction kettle manufacturing, in particular to a reaction kettle forging method.
Background
The high-pressure kettle body is an experimental container for researching the corrosion characteristics of reactor materials and is made of nickel-based superalloy inconel 625. The alloy 625 is a solid solution strengthening type nickel-based alloy taking Mo and Nb as main strengthening elements, has larger deformation resistance and narrower thermal deformation window in a hot working range, is hardened below a certain temperature, and is cracked at a lower temperature part after being continuously processed; since alloy 625 is relatively expensive, machining allowance needs to be further reduced in view of cost, and near-shape forging is realized; the high-pressure kettle body is used under the conditions of high temperature and high pressure, and the grain size of the high-pressure kettle body is required to reach more than 5 grade. The existing process for manufacturing the autoclave body is finished by a forged round bar machine, the machining allowance is large, the machining time is long, the metal texture of the inner cavity is damaged by machining, and a certain failure risk exists under high temperature and high pressure.
Disclosure of Invention
In view of the defects, the invention provides a reaction kettle forging method, which utilizes a punch to punch out blind holes, and the metal fiber texture of a forged piece is continuous through the reverse extrusion molding of the material in a die, so that the performance uniformity and the safety of a kettle body are improved.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a reactor forging method, comprising the steps of:
manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure;
obtaining a steel ingot by adopting an electric furnace and electroslag remelting process;
primarily forging the steel ingot to obtain a die forging blank;
placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity;
and machining the initial part of the kettle body to obtain a finished product of the reaction kettle.
According to an aspect of the invention, the steel ingot contains a plurality of solid solution strengthening elements.
According to an aspect of the invention, the preliminary forging of the steel ingot to obtain a die-forged blank comprises: and (3) upsetting and drawing out the steel ingot for at least two times, ensuring that the forging ratio is more than or equal to 4, and ensuring that the blank obtains a finer grain size.
According to an aspect of the invention, the preliminary forging of the steel ingot to obtain a die-forged blank comprises: the forging temperature is in the range of 1150-1000 ℃, and the forging cracking is avoided.
According to one aspect of the invention, the step of placing the die forging blank into a reaction kettle forming die for forging, wherein the die forging blank is subjected to backward extrusion to form a blind hole with the depth of more than or equal to 200mm, and the step of obtaining the kettle body initial part with the cavity comprises the following steps: controlling the initial forging temperature to be 1100-1150 ℃, the final forging temperature to be more than or equal to 1000 ℃, controlling the whole forming process to be within 10min, and immediately cooling by water after the completion to ensure that the grain size of the forged piece is more than or equal to grade 6.
According to one aspect of the invention, the reactor bed die comprises an upper punch and a lower die body comprising a die cavity.
According to an aspect of the present invention, the reaction kettle forging method further comprises: and (5) inspecting a finished product.
In accordance with one aspect of the invention, the product inspection comprises: fluid penetration test and full volume ultrasound test.
According to one aspect of the invention, before the step of machining the kettle body initial part to obtain the reaction kettle finished product is carried out, the kettle body initial part needs to be subjected to solution heat treatment.
In accordance with one aspect of the invention, the solution heat treatment comprises: the temperature of the solid solution heat treatment is 1050-.
The implementation of the invention has the advantages that: the reaction kettle forging method comprises the following steps: manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure; obtaining a steel ingot by adopting an electric furnace and electroslag remelting process; primarily forging the steel ingot to obtain a die forging blank; placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity; machining the initial part of the kettle body to obtain a finished product of the reaction kettle; the method is different from the method of machining the inner cavity of the autoclave body in the past, the blind holes are punched by the punch, the material is reversely extruded and formed in the die, the metal fiber texture of the forged piece is continuous, and the performance uniformity and the safety of the autoclave body are improved; the shape and the size of the forging are closer to those of a final finished product by using a die forging method, the consumption of raw materials is reduced, and the processing period can be shortened. The die forging die is simple, can be repeatedly used, has high forming efficiency and improves the production efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a reactor forging process according to the present invention;
FIG. 2 is a schematic structural view of a reactor matrix mold according to the present invention;
FIG. 3 is a solution heat treatment process profile according to the present invention.
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.
As shown in fig. 1, 2 and 3, a method of reactor forging comprising the steps of:
step S1: manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure;
the reaction kettle forming die comprises an upper punch and a lower die body containing a die cavity, and a material ejecting device is further arranged in the lower die body.
Step S2: obtaining a steel ingot by adopting an electric furnace and electroslag remelting process;
the steel ingot adopts an EF + ESR process (electric furnace + electroslag remelting) to ensure the purity of the raw materials. The internal control requirements of chemical components are increased, and the internal control components are shown in the following table:
(1) the content of solid solution strengthening elements such as Fe, Cr and the like is increased, and the strength is improved;
(2) the content of Ti and N elements is strictly controlled, and the formation of TiN inclusions is reduced.
Step S3: primarily forging the steel ingot to obtain a die forging blank;
the ingot blank is subjected to upsetting and drawing for at least two times, the forging ratio is ensured to be more than or equal to 4, the blank can obtain finer grain size, the forging temperature is controlled within the range of 1150-1000 ℃, and the forging cracking is avoided.
Step S4: placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity;
and (2) putting the die forging blank into a die cavity of a lower die body, quickly pressing the upper punch towards the center, reversely extruding the blank to form a blind hole with the depth of more than or equal to 200mm, forming a basic structure of the kettle body with a cavity, controlling the initial forging temperature to be 1100-1150 ℃, controlling the final forging temperature to be more than or equal to 1000 ℃, controlling the whole forming process to be within 10min, and immediately cooling water after the completion to ensure that the grain size of the forged piece is more than or equal to level 6.
The material is delivered in a solid solution treatment state, the temperature of the solid solution heat treatment is 1050-. The heating mode of preheating in low-temperature distinguishing stages and quick heating in a high-temperature area is adopted, and the fine grain size and the proper forging stress of the material are kept, so that the comprehensive performance of the material is improved. The heat treatment process graph is shown in fig. 3.
In order to accurately control the temperature of the forging, a nickel-chromium-nickel-silicon thermocouple is used for contacting the surface of the forging to measure the temperature of the surface of the forging, according to the requirements of RCC-M F8100, a thermocouple is respectively arranged at the thickest and thinnest positions of the forging, and a thermocouple is arranged in the middle of a batch to control the uniformity of the temperature of a workpiece.
Step S5: and machining the initial part of the kettle body to obtain a finished product of the reaction kettle.
And in the finished product processing process, equipment such as a planer type milling machine, a numerical control machine tool, a vertical drill, a boring machine and the like is adopted, so that the dimensional precision and the smoothness can meet the requirements.
And the finished product needs to pass liquid penetration detection and full-volume ultrasonic detection.
Mechanical property meter
| Test temperature | Tensile strength | Yield strength | Elongation after fracture | Hardness HV |
| At room temperature | ≥758 | ≥345 | ≥25 | ≥225 |
。
The implementation of the invention has the advantages that: the reaction kettle forging method comprises the following steps: manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure; obtaining a steel ingot by adopting an electric furnace and electroslag remelting process; primarily forging the steel ingot to obtain a die forging blank; placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity; machining the initial part of the kettle body to obtain a finished product of the reaction kettle; the method is different from the method of machining the inner cavity of the autoclave body in the past, the blind holes are punched by the punch, the material is reversely extruded and formed in the die, the metal fiber texture of the forged piece is continuous, and the performance uniformity and the safety of the autoclave body are improved; the shape and the size of the forging are closer to those of a final finished product by using a die forging method, the consumption of raw materials is reduced, and the processing period can be shortened. The die forging die is simple, can be repeatedly used, has high forming efficiency and improves the production efficiency.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A reaction kettle forging method is characterized by comprising the following steps:
manufacturing a reaction kettle forming die by adopting a three-body split sleeve die structure;
obtaining a steel ingot by adopting an electric furnace and electroslag remelting process;
primarily forging the steel ingot to obtain a die forging blank;
placing the die forging blank into a reaction kettle die mould for forging, and carrying out backward extrusion on the die forging blank to form a blind hole with the depth of more than or equal to 200mm so as to obtain a kettle body initial part with a cavity;
and machining the initial part of the kettle body to obtain a finished product of the reaction kettle.
2. The reactor forging method as recited in claim 1, wherein the steel slab contains a plurality of solid solution strengthening elements.
3. The reactor forging method as recited in claim 1, wherein the preliminary forging of the steel ingot to obtain a die-forged billet comprises: and (3) upsetting and drawing out the steel ingot for at least two times, ensuring that the forging ratio is more than or equal to 4, and ensuring that the blank obtains a finer grain size.
4. The reactor forging method as recited in claim 3, wherein the preliminary forging of the steel ingot to obtain a die-forged billet comprises: the forging temperature is in the range of 1150-1000 ℃, and the forging cracking is avoided.
5. The reaction kettle forging method as recited in claim 1, wherein the step of placing the die forging blank into a reaction kettle die mold for forging, and the step of performing backward extrusion on the die forging blank to form blind holes with the depth of more than or equal to 200mm to obtain the kettle body initial piece with the cavity comprises the following steps: controlling the initial forging temperature to be 1100-1150 ℃, the final forging temperature to be more than or equal to 1000 ℃, controlling the whole forming process to be within 10min, and immediately cooling by water after the completion to ensure that the grain size of the forged piece is more than or equal to grade 6.
6. The reactor forging method as recited in claim 1, wherein the reactor match die comprises an upper punch and a lower die body including a die cavity.
7. The reactor forging method as recited in claim 1, further comprising: and (5) inspecting a finished product.
8. The reactor forging method as recited in claim 7, wherein the final product inspection includes: fluid penetration test and full volume ultrasound test.
9. The reactor forging method as recited in any one of claims 1 to 8, wherein the step of subjecting the vessel body starting member to solution heat treatment is performed before the step of machining the vessel body starting member to obtain the finished reactor.
10. The reactor forging method as recited in claim 9, wherein the solution heat treatment includes: the temperature of the solid solution heat treatment is 1050-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911417637.XA CN113118374A (en) | 2019-12-31 | 2019-12-31 | Reaction kettle forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911417637.XA CN113118374A (en) | 2019-12-31 | 2019-12-31 | Reaction kettle forging method |
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|---|---|
| CN113118374A true CN113118374A (en) | 2021-07-16 |
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| CN201911417637.XA Pending CN113118374A (en) | 2019-12-31 | 2019-12-31 | Reaction kettle forging method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008188610A (en) * | 2007-02-02 | 2008-08-21 | Sanyo Special Steel Co Ltd | Method for forming cup shape formed body of bearing race |
| CN102091751A (en) * | 2010-12-03 | 2011-06-15 | 太原科技大学 | Control method for 316 LN steel heavy-forging forging crystalline grain |
| CN103706743A (en) * | 2013-12-12 | 2014-04-09 | 无锡透平叶片有限公司 | Die-forging forming process of titanium-alloy forged drum piece |
| CN105478508A (en) * | 2014-09-19 | 2016-04-13 | 苏州昆仑重型装备制造有限公司 | Inverted extrusion molding process of high pressure cylinder and inverted extrusion die adopted in inverted extrusion molding process |
| CN106670363A (en) * | 2016-12-20 | 2017-05-17 | 上海新闵重型锻造有限公司 | Manufacturing method for high-strength stainless steel forge piece |
| CN107186140A (en) * | 2017-06-30 | 2017-09-22 | 陕西宏远航空锻造有限责任公司 | A kind of in-flanges tubular high temperature alloy product manufacture method, prefabricated-member mould and flanging die |
| CN109834208A (en) * | 2017-11-28 | 2019-06-04 | 上海电气上重铸锻有限公司 | The top cover forging method of nuclear pressure container |
-
2019
- 2019-12-31 CN CN201911417637.XA patent/CN113118374A/en active Pending
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|---|---|---|---|---|
| JP2008188610A (en) * | 2007-02-02 | 2008-08-21 | Sanyo Special Steel Co Ltd | Method for forming cup shape formed body of bearing race |
| CN102091751A (en) * | 2010-12-03 | 2011-06-15 | 太原科技大学 | Control method for 316 LN steel heavy-forging forging crystalline grain |
| CN103706743A (en) * | 2013-12-12 | 2014-04-09 | 无锡透平叶片有限公司 | Die-forging forming process of titanium-alloy forged drum piece |
| CN105478508A (en) * | 2014-09-19 | 2016-04-13 | 苏州昆仑重型装备制造有限公司 | Inverted extrusion molding process of high pressure cylinder and inverted extrusion die adopted in inverted extrusion molding process |
| CN106670363A (en) * | 2016-12-20 | 2017-05-17 | 上海新闵重型锻造有限公司 | Manufacturing method for high-strength stainless steel forge piece |
| CN107186140A (en) * | 2017-06-30 | 2017-09-22 | 陕西宏远航空锻造有限责任公司 | A kind of in-flanges tubular high temperature alloy product manufacture method, prefabricated-member mould and flanging die |
| CN109834208A (en) * | 2017-11-28 | 2019-06-04 | 上海电气上重铸锻有限公司 | The top cover forging method of nuclear pressure container |
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| Title |
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