CN111014540A - Third-generation nuclear power coolant pump shell profiling forging forming method - Google Patents
Third-generation nuclear power coolant pump shell profiling forging forming method Download PDFInfo
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- CN111014540A CN111014540A CN202010002722.6A CN202010002722A CN111014540A CN 111014540 A CN111014540 A CN 111014540A CN 202010002722 A CN202010002722 A CN 202010002722A CN 111014540 A CN111014540 A CN 111014540A
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- upsetting
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- 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
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Abstract
The invention relates to the technical field of forging, and discloses a third-generation nuclear power coolant pump shell profiling forging forming method, which comprises the following steps: step one, upsetting and lengthening: carrying out upsetting and drawing-out treatment on the blank for multiple times to form a blank A; step two, upsetting and punching: upsetting and punching the blank A to form a blank B; step three, punch forming: performing punch forming on the blank B through the stepped core rod and the profiling lower die to form a blank C; step four, slightly pulling the nozzle: slightly pulling the blank C in the direction of the nozzle which is not on the side through a wide anvil and a stepped core rod, then rotating the blank C and the stepped core rod together for 90 degrees, and slightly pulling the blank C in the direction of the nozzle on the side to form a blank D; and step five, forming a pump shell. The stepped core rod is used for punch forming and drawing out, so that the profiling forming effect of the shape of the straight pipe nozzle and the profiling forming effect of the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe nozzle are realized.
Description
Technical Field
The invention relates to the technical field of forging, in particular to a third-generation nuclear power coolant pump shell profiling forging forming method.
Background
The nuclear power coolant pump is also called a main circulating pump or a main pump, is an important part of main equipment of a nuclear island, and is used for pushing coolant to stably circulate at high speed in a primary loop so as to cool a reactor core and transfer heat to a secondary loop; the working environment of the main pump is extremely severe, and particularly the pump casing is in a severe environment with high temperature, high corrosion and high radiation for a long time, so that the pump casing requires extremely safe and reliable quality. In the nuclear reactor system before the third generation, pump casings are all castings; with the development and application of third-generation nuclear power technologies such as AP1000 and EPR, higher requirements are also put forward on the quality of the pump shell, the pump shell is required to be manufactured by adopting a forged piece, the pump shell is a semi-closed hollow shell, the shape of the pump shell is circular or approximately elliptical, the pump shell is provided with a nozzle, and the shape of the pump shell is irregular, so that the forged piece has great difficulty in forging. In the prior art, the third-generation nuclear power coolant pump shell adopts an integral forging scheme, only the profile of the lateral nozzle is profiled, and the inner cavity of the pump shell and the inner hole and the profile of the straight nozzle are not profiled, so that the pump shell has the characteristics of low steel ingot utilization rate and long processing period. With the market competition becoming more fierce, the original integral forming scheme can not meet the control requirements of the market on the production cost and the period of the pump shell of the third-generation nuclear power coolant pump, and the profiling of the inner cavity of the pump shell, the inner hole of the straight pipe nozzle and the appearance becomes the trend of the subsequent production of the pump shell.
Disclosure of Invention
The invention provides a third-generation nuclear power coolant pump shell profiling forging forming method, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a third generation nuclear power coolant pump shell profiling forging forming method comprises the following steps:
step one, upsetting and lengthening: carrying out upsetting and drawing-out treatment on the blank for multiple times to form a blank A;
step two, upsetting and punching: upsetting and punching the blank A to form a blank B;
step three, punch forming: performing punch forming on the blank B through the stepped core rod and the profiling lower die to form a blank C;
step four, slightly pulling the nozzle: slightly pulling the blank C in the direction of the nozzle which is not on the side through a wide anvil and a stepped core rod, then rotating the blank C and the stepped core rod together for 90 degrees, and slightly pulling the blank C in the direction of the nozzle on the side to form a blank D;
step five, forming a pump shell: the blank D and the step core rod integrally rotate for 90 degrees, and an upper profiling anvil and a lower profiling anvil and the step core rod are used for profiling and forming to form the pump shell.
In a preferred embodiment of the present invention, in the first step, the billet is subjected to two upsetting and drawing processes.
As a preferable technical scheme of the invention, in the step one, in the upsetting process, the ratio of the height to the diameter is less than or equal to 2.5.
As a preferred technical scheme of the invention, in the first step, the strong pressure drawing ratio is more than or equal to 2 in the drawing process.
As a preferable technical scheme of the invention, in the first step, the gas cutting pliers handle and the bottom are subjected to drawing processing.
As a preferable technical solution of the present invention, in the fourth step, the direction of the side nozzle is a direction of a truncated surface of the stepped core rod.
The invention has the following advantages:
the pump shell body is formed by profiling an inner cavity and an inner hole of a nozzle with the shape, the main body belongs to a streamline curve, and the using performance is better. The stepped core rod is used for punch forming and drawing out, so that the profiling forming effect of the shape of the straight pipe nozzle and the profiling forming effect of the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe nozzle are realized. The profile modeling of the pump shell and the profile modeling of the side pipe nozzles are realized through the upper profiling anvil mould and the lower profiling anvil mould. The symmetrical requirement of the shape of the forge piece is met by adding the side pipe nozzles, the forming difficulty of the forge piece is effectively reduced, and the machining adjustment space is increased for the subsequent forge piece machining. By adopting the design of the profile of the stepped core rod which is symmetrically flattened in the single direction, the problem that the inner hole of the blank is locally expanded due to the single-direction deformation during the final compression is effectively solved, and the risk that the size requirement of the inner cavity of the pump shell is not met is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a third generation nuclear power coolant pump casing profiling forging forming method.
FIG. 2 is a schematic diagram of blank stamping in a third generation nuclear power coolant pump housing profiling forging forming method.
FIG. 3 is a schematic diagram of a stepped core rod in a third generation nuclear power coolant pump casing profiling forging forming method.
FIG. 4 is a schematic diagram of a lower profiling die in a third generation nuclear power coolant pump casing profiling forging forming method.
FIG. 5 is a schematic diagram of upper and lower profiling anvils in a third generation nuclear power coolant pump casing profiling forging forming method.
FIG. 6 is a schematic structural diagram of a pump casing in a third generation nuclear power coolant pump casing profiling forging forming method.
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.
Referring to fig. 1-6, a third generation nuclear power coolant pump casing profiling forging method includes the following steps:
step one, upsetting and lengthening: carrying out multiple upsetting and drawing treatments on the blank to form a blank A, carrying out twice upsetting and drawing treatments on the blank, wherein the ratio of the height to the diameter is less than or equal to 2.5 in the upsetting process, the ratio of the forced pressing to the drawing is more than or equal to 2 in the drawing process, and after the drawing process, the gas cutting pliers handle and the bottom are used for twice upsetting and forced pressing to draw, so that the blank has enough forging ratio to ensure the integral compaction of the blank;
step two, upsetting and punching: upsetting and punching the blank A to form a blank B which is a formed prefabricated blank of the inner cavity of the pump shell and the shape of the straight pipe nozzle;
step three, punch forming: the blank B is subjected to punch forming through a stepped core rod and a profiling lower die to form a blank C, the stepped core rod is composed of shafts with different diameters and inclined cone areas connecting the shafts with different diameters, the stepped core rod composed of the shafts with different diameters can effectively profile the appearance that the size of an inner cavity of a pump shell is large and the size of an inner hole of a straight pipe nozzle is small, the square degree is effectively improved, the shaft parts with different diameters in the stepped core rod are connected through the inclined cone areas, the inclined cone angle is about 50 degrees, the pressure borne by the stepped core rod during punch forming can be reduced due to the existence of the inclined cone areas, the stepped core rod is matched with the equipment capacity of the existing ten thousand-ton press, the blank is prevented from being sheared during punch forming, the blank is mainly extruded to complete the forming of the straight pipe nozzle part, a group of symmetrical planes are machined by the stepped core rod in a large, the condition that the inner hole is insufficient in size due to local size expansion during one-way compression can be effectively avoided, the lower die is profiled, allowance is placed on the shape of the straight nozzle of the pump shell for profiling through the inner hole, the weight of a forged piece can be effectively reduced, and the profiling degree of the pump shell is improved; in order to save cost, the profiling lower die can be replaced by an upsetting drain pan with an approximate inner hole;
step four, slightly pulling the nozzle: slightly pulling the blank C in the direction of a non-side nozzle through a wide anvil and a stepped core rod, then rotating the blank C and the stepped core rod together for 90 degrees, slightly pulling the blank C in the direction of a side nozzle, wherein the direction of the side nozzle is the direction of a cutting plane of the stepped core rod to form a blank D, and preparing for final compression forming through the sequential slight pulling, avoiding the deformation of the blank in one continuous direction and reducing the local swelling tendency of an inner hole;
step five, forming a pump shell: the blank D and the stepped core rod integrally rotate for 90 degrees, an upper profiling anvil and a lower profiling anvil and the stepped core rod are used for profiling the shapes of the pump shell and the side nozzle, the pump shell is formed, the upper profiling anvil and the lower profiling anvil are used for carrying out allowance profiling according to the shapes of the pump shell and the side nozzle, and the profiles of the pump shell and the symmetrical side nozzle (adding the side nozzle) can be effectively profiled.
The invention solves the forging problem of the technical problem of the profile forging of the inner cavity of the pump shell of the third generation nuclear power coolant pump and the inner hole and the shape of the straight pipe nozzle.
Through the first step and the second step, the blank has enough forging ratio and is fully forged through the core of the steel ingot, and holes formed when the steel ingot is broken. The height-diameter ratio of the blank before upsetting is strictly controlled during blank upsetting, the ratio of the height to the diameter is less than or equal to 2.5, and the forced drawing length ratio is more than or equal to 2;
through the third step, the preliminary molding of the inner cavity of the pump shell and the molding of the inner hole and the shape of the straight pipe nozzle are realized;
through the fourth step, the process of slightly drawing the blank in sequence can prepare for final compression forming, the blank is prevented from continuously deforming in one direction, and the local expansion trend of the inner hole is reduced;
through the fifth step, the final forming of the inner cavity and the shape of the pump shell and the forming of the shape of the side nozzle are realized;
by adopting the design of the profile of the step core rod which is symmetrically flattened in the single direction and enabling the flattened side to be in the forming direction of the side nozzle during the pressing, the size of the inner hole of the pump shell is inhibited from locally expanding in the non-pressing direction (the forming direction of the side nozzle) during the single-direction pressing of the blank by the flattening area, and the metal flow of the side is supplemented, so that the inner hole meets the product requirement.
The invention solves the technical problem of the profile forging of the inner cavity of the pump shell and the inner hole and the shape of the straight pipe nozzle of the third generation nuclear power coolant pump. The technical problem of the profile forging of the inner cavity of the pump shell and the inner hole of the straight pipe nozzle of the third-generation nuclear power coolant pump is solved, the weight of a steel ingot is directly reduced by about 50t by a single piece, the product utilization rate is improved, the workload and the period of machining procedures are indirectly reduced, and the total production cost and the period of the pump shell of the third-generation nuclear power coolant pump are integrally reduced. The pump shell body is formed by profiling an inner cavity and an inner hole of a nozzle with the shape, the main body belongs to a streamline curve, and the using performance is better. The stepped core rod is used for punch forming and drawing out, so that the profiling forming effect of the shape of the straight pipe nozzle and the profiling forming effect of the variable cross-section inner cavity of the pump shell and the inner hole of the straight pipe nozzle are realized. The profile modeling of the pump shell and the profile modeling of the side pipe nozzles are realized through the upper profiling anvil mould and the lower profiling anvil mould. The symmetrical requirement of the shape of the forge piece is met by adding the side pipe nozzles, the forming difficulty of the forge piece is effectively reduced, and the machining adjustment space is increased for the subsequent forge piece machining. By adopting the design of the profile of the stepped core rod which is symmetrically flattened in the single direction, the problem that the inner hole of the blank is locally expanded due to the single-direction deformation during the final compression is effectively solved, and the risk that the size requirement of the inner cavity of the pump shell is not met is solved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A third generation nuclear power coolant pump shell profiling forging forming method is characterized by comprising the following steps:
step one, upsetting and lengthening: carrying out upsetting and drawing-out treatment on the blank for multiple times to form a blank A;
step two, upsetting and punching: upsetting and punching the blank A to form a blank B;
step three, punch forming: performing punch forming on the blank B through the stepped core rod and the profiling lower die to form a blank C;
step four, slightly pulling the nozzle: slightly pulling the blank C in the direction of the nozzle which is not on the side through a wide anvil and a stepped core rod, then rotating the blank C and the stepped core rod together for 90 degrees, and slightly pulling the blank C in the direction of the nozzle on the side to form a blank D;
step five, forming a pump shell: the blank D and the step core rod integrally rotate for 90 degrees, and an upper profiling anvil and a lower profiling anvil and the step core rod are used for profiling and forming to form the pump shell.
2. The third generation nuclear power coolant pump housing profile forging forming method of claim 1, wherein in the first step, the blank is subjected to upsetting and drawing twice.
3. The third generation nuclear power coolant pump housing profile forging forming method of claim 1, wherein in the first step, the ratio of height to diameter during upsetting is less than or equal to 2.5.
4. The third-generation nuclear power coolant pump shell profiling forging forming method is characterized in that in the first drawing process, the forced drawing ratio is more than or equal to 2.
5. The third generation nuclear power coolant pump housing contour forging method of claim 1, characterized in that in step one, the gas cutting pliers handle and the bottom are drawn out after the drawing process.
6. The third generation nuclear power coolant pump casing profiling forging forming method of claim 1, wherein in the fourth step, the side nozzle direction is a stepped core rod flat cutting direction.
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| CN202010002722.6A CN111014540B (en) | 2020-01-02 | 2020-01-02 | Third-generation nuclear power coolant pump shell profiling forging forming method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111702118A (en) * | 2020-06-18 | 2020-09-25 | 中国第一重型机械股份公司 | Method and die for forging main pump shell by using hollow steel ingot |
| CN113787161A (en) * | 2021-08-20 | 2021-12-14 | 上海电气上重铸锻有限公司 | Free forging semi-profiling forging forming method |
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| CN111702118A (en) * | 2020-06-18 | 2020-09-25 | 中国第一重型机械股份公司 | Method and die for forging main pump shell by using hollow steel ingot |
| CN111702118B (en) * | 2020-06-18 | 2022-04-22 | 中国第一重型机械股份公司 | Method and die for forging main pump shell by using hollow steel ingot |
| CN113787161A (en) * | 2021-08-20 | 2021-12-14 | 上海电气上重铸锻有限公司 | Free forging semi-profiling forging forming method |
| CN113787161B (en) * | 2021-08-20 | 2024-05-10 | 上海电气上重铸锻有限公司 | Free forging semi-profiling forging forming method |
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