CN112496250A - Method for manufacturing connecting rod for nuclear power embedded container - Google Patents
Method for manufacturing connecting rod for nuclear power embedded container Download PDFInfo
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- CN112496250A CN112496250A CN202011354079.XA CN202011354079A CN112496250A CN 112496250 A CN112496250 A CN 112496250A CN 202011354079 A CN202011354079 A CN 202011354079A CN 112496250 A CN112496250 A CN 112496250A
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- anvil
- stepped shaft
- connecting rod
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- 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
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/766—Connecting rods
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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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/06—Hammers tups; Anvils; Anvil blocks
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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
-
- 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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- 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
- B21J5/08—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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a method for manufacturing a connecting rod for a nuclear power embedded container, which comprises the following steps: (1) forging; (2) drawing out; (3) punching blind holes; (4) returning for the first time; (5) returning for the second time; (6) and (6) punching. The invention can forge thin-wall forgings of different materials and sizes, can forge wavy forgings, has the characteristics of complete and complete distribution of fiber directions along with shapes, safety and reliability, high temperature resistance, high pressure resistance and corrosion resistance, small machining excess material, material saving, short machining period and low manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of forging manufacturing, and particularly relates to a method for manufacturing a connecting rod for a nuclear power embedded container.
Background
The connecting rod is a special-shaped structural member with an inner hole for a pre-embedded container 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 connecting rod manufacturing method generally adopts a forging with thicker thickness to forge, then the upper end surface and the lower end surface are milled, and the mode of turning redundant internal allowance is adopted; or formed by adopting a die forging mode. The fiber direction in the product produced by adopting the forging mode is cut off at present, so the comprehensive mechanical property and the service life of the product are reduced, and the machining allowance is too large, so the required machining is long, and meanwhile, the waste of raw materials is caused; and the die forging mode is adopted for forming, firstly, because the part is large, the requirement on die forging press equipment is high, equipment with small tonnage can not be formed by die forging, and secondly, the inner hole of the product can not be formed by die forging. The two methods both adopt mechanical processing to remove redundant metal to manufacture the connecting rod, and have the technical problems of large mechanical processing allowance, long processing period, large material waste and high manufacturing cost. Therefore, there is a great need for improvement of the existing processing technology to meet the use requirements.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for manufacturing a connecting rod for a nuclear power embedded container.
The manufacturing method of the connecting rod for the nuclear power embedded container comprises the following steps:
(1) forging: heating the steel ingot to 850-1150 ℃, and then forging and cogging the blank on a free forging press;
(2) drawing out: upsetting and drawing the blank into a cylindrical forge piece by using an upper flat anvil and a lower flat anvil, then distributing the materials to obtain a cylindrical blank, and then drawing the cylindrical blank in a segmented manner by using an upper half and a lower half and rolling and drawing the cylindrical blank until the cylindrical stepped shaft blank is formed;
(3) punching blind holes: punching a blind hole on the end face of the small end of the stepped shaft to obtain a cylindrical stepped shaft blank with the blind hole;
(4) the first time of furnace return: the method comprises the following steps of (1) returning a cylindrical stepped shaft blank with a blind hole to a furnace for heating and heat preservation, wherein the heating temperature is lower than 1100 ℃, simultaneously preheating a lower forming die to 250-350 ℃, coating a release agent, integrally moving the lower forming die to a working platform of a hydraulic press and under an upper anvil of the hydraulic press, replacing the upper anvil of the hydraulic press by an upper forming die, putting the heated cylindrical stepped shaft blank with the blind hole into a lower forming die, clamping a small end of the cylindrical stepped shaft blank with the blind hole by an operating machine, and uniformly pressing the upper forming die downwards under the action of the hydraulic press while the cylindrical stepped shaft blank with the blind hole is driven to rotate by the operating machine to obtain a forged blank;
(5) and (3) carrying out secondary furnace returning: returning the forged blank to a furnace for heating and preserving heat, wherein the heating temperature is lower than 1050 ℃, simultaneously replacing a forming upper die with an upper inclined plane anvil, replacing a forming lower die with a lower inclined plane anvil, and then flattening and forming the large end of the forged blank by using an upper flat anvil and a lower flat anvil;
(6) punching: and (5) punching the large-end plane flattened and formed in the step (5) to finally reach an ideal size.
In order to facilitate sectional drawing, indentations are cut on the circumferential surface of the cylindrical forging piece in 360 degrees after material distribution.
In order to ensure that the two sides of the large end of the flattened blank are symmetrical, the step (5) repeatedly rotates for 180 ︒ when flattening is carried out, and the upper inclined anvil uniformly presses downwards so as to ensure the excellent comprehensive mechanical property of the connecting rod.
Further, the heat preservation time in the step (4) is 1-5h, and the heat preservation time in the step (5) is 1-5 h.
Compared with the prior art, the method for manufacturing the connecting rod for the nuclear power embedded container has the beneficial effects that: the invention can forge thin-wall forgings of different materials and sizes, can forge wavy forgings, has the characteristics of complete and complete distribution of fiber directions along with shapes, safety and reliability, high temperature resistance, high pressure resistance and corrosion resistance, small machining excess material, material saving, short machining period and low manufacturing cost.
Drawings
FIG. 1 is a cylindrical blank of the present invention;
FIG. 2 is a blank for a cylindrical stepped shaft with blind holes according to the present invention;
FIG. 3 is a schematic structural view of a forming upper die of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic structural view of a lower mold for molding according to the present invention;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a forged blank of the present invention;
FIG. 8 is a view of the upper and lower ramp anvils of the present invention in use;
FIG. 9 is a schematic structural view of a connecting rod manufactured according to the present invention;
fig. 10 is a left side view of fig. 9.
Shown in the figure, 1-forming upper die, 2-forming lower die, 3-upper inclined plane anvil, 4-lower inclined plane anvil, 5-cylindrical blank, 6-cylindrical stepped shaft blank with blind holes, 7-forged blank and 8-connecting rod.
Detailed Description
The principles and features of this invention are described below in conjunction with examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
As shown in fig. 1-10, the method for manufacturing the connecting rod for the nuclear power embedded container comprises the following steps:
(1) forging: heating the steel ingot to 850-900 ℃, and then forging the blank on a free forging press to obtain a blank;
(2) drawing out: upsetting and drawing the blank into a cylindrical forge piece by using an upper flat anvil and a lower flat anvil, then distributing the materials to obtain a cylindrical blank 5, and drawing the cylindrical blank 5 by using an upper half and a lower half in a segmented manner, and rolling and drawing the cylindrical blank until the cylindrical stepped shaft blank is formed;
(3) punching blind holes: punching a blind hole on the end face of the small end of the stepped shaft to obtain a cylindrical stepped shaft blank 6 with the blind hole;
(4) the first time of furnace return: the method comprises the following steps of (1) returning a cylindrical stepped shaft blank 6 with a blind hole to a furnace for heating and heat preservation, wherein the heating temperature is lower than 1100 ℃, simultaneously preheating a lower forming die to 250-300 ℃, coating a release agent, integrally moving the lower forming die to a working platform of a hydraulic press and positioned under an upper anvil of the hydraulic press, replacing the upper anvil of the hydraulic press by an upper forming die, then putting the heated cylindrical stepped shaft blank 6 with the blind hole into the lower forming die, clamping a small end of the cylindrical stepped shaft blank 6 with the blind hole by an operating machine, and uniformly pressing the upper forming die downwards under the action of the hydraulic press while the cylindrical stepped shaft blank 6 with the blind hole is driven to rotate by the operating machine to obtain a forged blank 7;
(5) and (3) carrying out secondary furnace returning: the forged blank 7 is returned to the furnace to be heated and kept warm, the heating temperature is lower than 1050 ℃, meanwhile, the upper forming upper die 1 is replaced by the upper inclined plane anvil 3, the lower forming lower die 2 is replaced by the lower inclined plane anvil 4, and then the large end of the forged blank 7 is flattened and formed by the upper flat anvil and the lower flat anvil;
(6) punching: and (5) punching the large-end plane flattened and formed in the step (5) to finally reach an ideal size, so as to obtain the connecting rod 8.
In order to facilitate sectional drawing, indentations are cut on the circumferential surface of the cylindrical forging piece in 360 degrees after material distribution.
In order to ensure that the two sides of the large end of the flattened blank are symmetrical, the step (5) repeatedly rotates for 180 ︒ when flattening is carried out, and the upper inclined anvil uniformly presses downwards so as to ensure the excellent comprehensive mechanical property of the connecting rod.
Further, the heat preservation time in the step (4) is 1h, and the heat preservation time in the step (5) is 1 h.
Example 2
As shown in fig. 1-10, the method for manufacturing the connecting rod for the nuclear power embedded container comprises the following steps:
(1) forging: heating the steel ingot to 900-1150 ℃, and then forging and cogging the blank on a free forging press;
(2) drawing out: upsetting and drawing the blank into a cylindrical forge piece by using an upper flat anvil and a lower flat anvil, then distributing the materials to obtain a cylindrical blank 5, and drawing the cylindrical blank 5 by using an upper half and a lower half in a segmented manner, and rolling and drawing the cylindrical blank until the cylindrical stepped shaft blank is formed;
(3) punching blind holes: punching a blind hole on the end face of the small end of the stepped shaft to obtain a cylindrical stepped shaft blank 6 with the blind hole;
(4) the first time of furnace return: the method comprises the following steps of (1) returning a cylindrical stepped shaft blank 6 with a blind hole to a furnace for heating and heat preservation, wherein the heating temperature is lower than 1100 ℃, simultaneously preheating a lower forming die to 250-350 ℃, coating a release agent, integrally moving the lower forming die to a working platform of a hydraulic press and positioned under an upper anvil of the hydraulic press, replacing the upper anvil of the hydraulic press by an upper forming die, then putting the heated cylindrical stepped shaft blank 6 with the blind hole into the lower forming die, clamping a small end of the cylindrical stepped shaft blank 6 with the blind hole by an operating machine, and uniformly pressing the upper forming die downwards under the action of the hydraulic press while the cylindrical stepped shaft blank 6 with the blind hole is driven to rotate by the operating machine to obtain a forged blank 7;
(5) and (3) carrying out secondary furnace returning: the forged blank 7 is returned to the furnace to be heated and kept warm, the heating temperature is lower than 1050 ℃, meanwhile, the upper forming upper die 1 is replaced by the upper inclined plane anvil 3, the lower forming lower die 2 is replaced by the lower inclined plane anvil 4, and then the large end of the forged blank 7 is flattened and formed by the upper flat anvil and the lower flat anvil;
(6) punching: and (5) punching the large-end plane flattened and formed in the step (5) to finally reach an ideal size, so as to obtain the connecting rod 8.
In order to facilitate sectional drawing, indentations are cut on the circumferential surface of the cylindrical forging piece in 360 degrees after material distribution.
In order to ensure that the two sides of the large end of the flattened blank are symmetrical, the step (5) repeatedly rotates for 180 ︒ when flattening is carried out, and the upper inclined anvil uniformly presses downwards so as to ensure the excellent comprehensive mechanical property of the connecting rod.
Further, the heat preservation time in the step (4) is 2 hours, and the heat preservation time in the step (5) is 2 hours.
Example 3
As shown in fig. 1-10, the method for manufacturing the connecting rod for the nuclear power embedded container comprises the following steps:
(1) forging: heating the steel ingot to 900-950 ℃, and then forging and stripping the blank on a free forging press;
(2) drawing out: upsetting and drawing the blank into a cylindrical forge piece by using an upper flat anvil and a lower flat anvil, then distributing the materials to obtain a cylindrical blank 5, and drawing the cylindrical blank 5 by using an upper half and a lower half in a segmented manner, and rolling and drawing the cylindrical blank until the cylindrical stepped shaft blank is formed;
(3) punching blind holes: punching a blind hole on the end face of the small end of the stepped shaft to obtain a cylindrical stepped shaft blank 6 with the blind hole;
(4) the first time of furnace return: the method comprises the following steps of (1) returning a cylindrical stepped shaft blank 6 with a blind hole to a furnace for heating and heat preservation, wherein the heating temperature is lower than 1100 ℃, simultaneously preheating a lower forming die to 300-350 ℃, coating a release agent, integrally moving the lower forming die to a working platform of a hydraulic press and positioned under an upper anvil of the hydraulic press, replacing the upper anvil of the hydraulic press by an upper forming die, then putting the heated cylindrical stepped shaft blank 6 with the blind hole into the lower forming die, clamping a small end of the cylindrical stepped shaft blank 6 with the blind hole by an operating machine, and uniformly pressing the upper forming die downwards under the action of the hydraulic press while the cylindrical stepped shaft blank 6 with the blind hole is driven to rotate by the operating machine to obtain a forged blank 7;
(5) and (3) carrying out secondary furnace returning: the forged blank 7 is returned to the furnace to be heated and kept warm, the heating temperature is lower than 1050 ℃, meanwhile, the upper forming upper die 1 is replaced by the upper inclined plane anvil 3, the lower forming lower die 2 is replaced by the lower inclined plane anvil 4, and then the large end of the forged blank 7 is flattened and formed by the upper flat anvil and the lower flat anvil;
(6) punching: and (5) punching the large-end plane flattened and formed in the step (5) to finally reach an ideal size, so as to obtain the connecting rod 8.
In order to facilitate sectional drawing, indentations are cut on the circumferential surface of the cylindrical forging piece in 360 degrees after material distribution.
In order to ensure that the two sides of the large end of the flattened blank are symmetrical, the step (5) repeatedly rotates for 180 ︒ when flattening is carried out, and the upper inclined anvil uniformly presses downwards so as to ensure the excellent comprehensive mechanical property of the connecting rod.
Further, the heat preservation time in the step (4) is 5 hours, and the heat preservation time in the step (5) is 5 hours.
The invention can forge thin-wall forgings of different materials and sizes, can forge wavy forgings, has the characteristics of complete and complete distribution of fiber directions along with shapes, safety and reliability, high temperature resistance, high pressure resistance and corrosion resistance, small machining excess material, material saving, short machining period and low manufacturing cost.
The scope of the present invention is not limited to the technical solutions disclosed in the embodiments, and any modifications, equivalent substitutions, improvements, etc. made to the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (4)
1. The manufacturing method of the connecting rod for the nuclear power embedded container is characterized by comprising the following steps of: the method comprises the following steps:
(1) forging: heating the steel ingot to 850-1150 ℃, and then forging and cogging the blank on a free forging press;
(2) drawing out: upsetting and drawing the blank into a cylindrical forge piece by using an upper flat anvil and a lower flat anvil, then distributing the materials to obtain a cylindrical blank, and then drawing the cylindrical blank in a segmented manner by using an upper half and a lower half and rolling and drawing the cylindrical blank until the cylindrical stepped shaft blank is formed;
(3) punching blind holes: punching a blind hole on the end face of the small end of the stepped shaft to obtain a cylindrical stepped shaft blank with the blind hole;
(4) the first time of furnace return: the method comprises the following steps of (1) returning a cylindrical stepped shaft blank with a blind hole to a furnace for heating and heat preservation, wherein the heating temperature is lower than 1100 ℃, simultaneously preheating a lower forming die to 250-350 ℃, coating a release agent, integrally moving the lower forming die to a working platform of a hydraulic press and under an upper anvil of the hydraulic press, replacing the upper anvil of the hydraulic press by an upper forming die, putting the heated cylindrical stepped shaft blank with the blind hole into a lower forming die, clamping a small end of the cylindrical stepped shaft blank with the blind hole by an operating machine, and uniformly pressing the upper forming die downwards under the action of the hydraulic press while the cylindrical stepped shaft blank with the blind hole is driven to rotate by the operating machine to obtain a forged blank;
(5) and (3) carrying out secondary furnace returning: returning the forged blank to a furnace for heating and preserving heat, wherein the heating temperature is lower than 1050 ℃, simultaneously replacing a forming upper die with an upper inclined plane anvil, replacing a forming lower die with a lower inclined plane anvil, and then flattening and forming the large end of the forged blank by using an upper flat anvil and a lower flat anvil;
(6) punching: and (5) punching the large-end plane formed by flattening in the step (5).
2. The manufacturing method of the connecting rod for the nuclear power embedded container as claimed in claim 1, characterized in that: and cutting an indentation on the circumferential surface of the cylindrical forging piece at 360 degrees after the material distribution.
3. The manufacturing method of the connecting rod for the nuclear power embedded container as claimed in claim 1, characterized in that: when the step (5) is performed, the 180 ︒ is rotated repeatedly, and the upper bevel anvil presses downward uniformly.
4. The manufacturing method of the connecting rod for the nuclear power embedded container as claimed in claim 1, characterized in that: the heat preservation time in the step (4) is 1-5h, and the heat preservation time in the step (5) is 1-5 h.
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| CN112496250B CN112496250B (en) | 2023-05-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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