CN111687605A - Preparation method of connecting ring chain for control rod system and connecting ring chain - Google Patents
Preparation method of connecting ring chain for control rod system and connecting ring chain Download PDFInfo
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- CN111687605A CN111687605A CN202010573280.0A CN202010573280A CN111687605A CN 111687605 A CN111687605 A CN 111687605A CN 202010573280 A CN202010573280 A CN 202010573280A CN 111687605 A CN111687605 A CN 111687605A
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- ring chain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a preparation method of a connecting ring chain for a control rod system and the connecting ring chain, wherein the preparation method comprises the following steps: s1, machining a single chain and welding a groove: cutting the metal forging into a size suitable for single-chain machining, machining and forming the single chain by utilizing machining equipment and a tool in a divided mode, and machining a groove on the single chain; s2, chaining: connecting a plurality of single chains in series into a ring chain by using a groove; s3, welding the groove: and adopting gas tungsten arc welding for connection. The invention solves the problem of crack caused by cold bending adopted by the existing preparation method, and the quality of the prepared product meets the requirement of a control rod system.
Description
Technical Field
The invention relates to the technical field of control rod driving systems in nuclear power plants, in particular to a preparation method of a connecting ring chain for a control rod system and the connecting ring chain.
Background
A nuclear reactor control rod drive system typically includes a drive mechanism, a control rod assembly, and a corresponding connecting link chain. The driving mechanism is an actuating mechanism of a nuclear reactor control system and a protection system; the control rod assembly mainly has the function of containing the neutron absorber unit, so that the absorber is integrated; and the connecting ring chain reliably connects the two. Under the drive of the driving mechanism, the control rod assembly is integrally inserted downwards, lifted or suspended through the ring chain, so that the aim of controlling the neutron absorption degree is fulfilled, and the functions of starting, adjusting power, maintaining power, normally stopping the reactor and the like of the reactor are realized, and the emergency shutdown under the accident working condition can be realized.
In nuclear fission reactors, particularly in reactor types such as gas cooled reactors and molten salt reactors, the connecting ring chain is the only connecting part between the driving mechanism and the control rod assembly, plays a crucial role in the whole control rod system, and because the connecting ring chain bears larger stretching and impact force and mostly works in a high-temperature environment, the manufacturing quality of the connecting ring chain becomes a key link of the comprehensive quality of the whole control rod system.
In the existing reactor types such as gas cooled reactor, molten salt reactor and the like, the conventional manufacturing method of the connecting ring chain is completed by using an automatic chain knitting machine which integrates chain bending, chain knitting and welding into a whole in one step. Most of connecting ring chain materials in a control rod system are nickel-based alloys with good high temperature resistance, stress concentration is caused at the bending radius of the materials when the chain is subjected to cold bending, various defects such as cracks are easily generated, the comprehensive quality is difficult to guarantee, and a large amount of scrap is often caused.
Disclosure of Invention
The invention aims to provide a preparation method of a connecting ring chain for a control rod system, which solves the problem of crack caused by cold bending in the existing preparation method and meets the requirement of the control rod system on quality.
The invention is realized by the following technical scheme:
a preparation method of a connecting ring chain for a control rod system comprises the following steps:
s1, machining single chains and grooves: cutting the metal forging into a size suitable for single-chain machining, machining and molding the single chain by using metal cutting equipment, and machining a groove on the single chain;
s2, chaining: connecting a plurality of single chains in series into a ring chain by using a groove;
s3, groove welding: and welding the grooves at each position by adopting a proper welding mode (such as tungsten gas shielded welding, laser welding and the like) so as to completely seal and connect the grooves.
The metal forging is preferably a nickel-based alloy.
Compared with the prior art, the invention has the advantages that:
the cold bending process is directly replaced by a machining mode, so that local stress concentration of the material caused by cold bending is fundamentally avoided, and the risk of crack generation is radically eliminated. Meanwhile, the connecting ring chain formed by machining is precise and standard in size, so that the subsequent welding and flaw detection are facilitated, more importantly, the meshing precision of the connecting ring chain and the chain wheel is greatly improved, and the self quality of the connecting ring chain and the meshing transmission quality and efficiency of the chain wheel and the chain are obviously improved.
In conclusion, the invention solves the problem of crack caused by cold bending in the existing preparation method by adopting the machining single chain and the welding groove, and the quality meets the requirement of a control rod system.
Further, the forging ratio of the metal forging of step S1 is 2 or more.
According to the invention, by selecting a reasonable forging ratio, the internal pores and cast dendrites of the forging stock are broken, and the transverse and longitudinal mechanical properties of the material are obviously improved. According to the invention, by selecting a reasonable forging ratio and simultaneously machining the single chain and the welding groove, the problem of cracks caused by cold bending adopted by the existing preparation method is further solved, and the quality meets the requirement of a control rod system.
Preferably, the bevel in step S2 is arranged in the middle of the single chain.
Specifically, the single chain comprises 2 straight line segments, two ends of the 2 straight line segments are connected through an arc-shaped segment, and the groove is arranged in the middle of one of the straight line segments.
Further, the groove parameters in step S4 are: the bevel is 90 degrees.
The groove has two key functions: the single chain is used for chaining, and each single chain can be connected in series to form a ring chain due to the existence of the groove; and the other part plays a role of welding the groove. Therefore, the groove is arranged in the middle of the single chain, the parameters are set to be 90 degrees, the chaining is convenient, and the welding penetration of the welding line is facilitated.
Further, the method comprises the following steps of carrying out heat treatment on the welded ring chain: and (4) heating the ring chain in a furnace to a temperature not higher than 1200 ℃, carrying out air cooling after proper heat preservation, and carrying out heat treatment on the ring chain with the welded groove to eliminate welding stress.
The reasonable heat treatment system can effectively eliminate the stress generated by welding and avoid the appearance of weld cracks.
Further, the method comprises the step of performing shot peening treatment on the ring chain after the heat treatment.
The shot peening strengthening treatment is to spray high-speed shot flow to the whole surface of the connecting ring chain to enable the surface to generate plastic deformation and form a strengthening layer with certain thickness, and higher residual stress is formed in the strengthening layer. After the heat treatment of the connecting ring chain, one or more times of shot blasting treatment is adopted, so that the tensile strength and the comprehensive mechanical property of the connecting ring chain can be effectively improved.
Preferably, the shot peening treatment is followed by nondestructive inspection in sequence: carrying out nondestructive inspection and comprehensive performance test on the connecting ring chain: and (5) detecting the mechanical property of the finished connecting ring chain product qualified by nondestructive inspection.
Further, the shot peening treatment is performed one or more times.
Further, weld grinding is carried out after groove welding: and polishing and cleaning the welding seam of each groove, and enabling the diameter of the welding seam to be close to the diameter of other parts of the single chain.
And further, carrying out nondestructive flaw detection on the weld joint after the groove weld joint is polished, and removing the single chain where the unqualified flaw detection weld joint is located.
Preferably, before the chaining, the single chain is subjected to nondestructive inspection, and after the inspection is qualified, the chaining and the welding are performed.
Further, the method also comprises the step of carrying out final nondestructive inspection after the loop chain is finished.
A connecting link chain prepared by the preparation method of the connecting link chain for a control rod system.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, by selecting a reasonable forging ratio and simultaneously machining the single chain and the welding groove, the problem of cracks caused by cold bending adopted by the existing preparation method is solved, and the quality meets the requirement of a control rod system.
2. The invention improves the tensile strength and the comprehensive mechanical property of the connecting ring chain by carrying out heat treatment and shot blasting treatment on the connecting ring chain.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a single strand after processing into a loop strand;
FIG. 2 is a schematic view of a single strand with a bevel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 1 and 2, a method for preparing a connecting link chain for a control rod system includes the following steps:
s1, selecting a metal forging with a forging ratio of 3-5;
s2, machining single chains and grooves: cutting a nickel-based alloy forging into a size suitable for machining of a single chain, using machining equipment and a tool to divide the single chain into two parts, machining and molding the single chain through mechanical cutting, polishing and grinding the flashes at the joint of the two sides, and finally linearly cutting a groove, wherein the groove is arranged in the middle of the single chain;
s3, chaining: carrying out nondestructive inspection on the single chains, and connecting a plurality of single chains in series into a ring chain by using a groove after the single chains are inspected to be qualified;
s4, welding the groove: adopting gas tungsten arc welding for connection, wherein the welding groove has the parameter of 90 degrees, polishing after welding, and smoothly transiting all parts.
And after the chain is finished, carrying out nondestructive inspection, and carrying out mechanical property detection such as tensile, bending and hardness tests, chain breaking force tests and the like.
Example 2:
as shown in fig. 1, the present embodiment is based on embodiment 1, and embodiment 1 is different in that: the method also comprises the steps of carrying out heat treatment and shot peening strengthening treatment on the welded ring chain in sequence; the heat treatment process is as follows:
charging into a furnace at room temperature, heating to a temperature not higher than 900 ℃, carrying out proper heat preservation, then heating to a temperature not higher than 1200 ℃, carrying out short-time heat preservation, and then carrying out air cooling; the shot blasting is to spray high-speed shot flow to the whole surface of the connecting ring chain to enable the surface to generate plastic deformation and form a strengthening layer with a certain thickness, thereby improving the mechanical properties such as tensile strength of the workpiece. After the heat treatment of the connecting ring chain is finished, the tensile strength and the comprehensive mechanical property of the connecting ring chain can be further improved by adopting multiple shot blasting treatments.
And after the chain is finished, carrying out nondestructive inspection, and carrying out mechanical property detection such as tensile, bending and hardness tests, chain breaking force tests and the like.
Comparative example 1:
the preparation of the loop chain is completed by one-step manufacturing by using an automatic chain knitting machine integrating bending, chain knitting and welding.
After completion of the loop chains of example 1, example 2 and comparative example 1, the following tests were carried out:
1. comparative example 1 permeation test (cleaning the loop chain, spraying penetrant, permeation time 20 minutes, removing penetrant, drying the part, spraying developer) was performed on the loop chain bend, showing blushing, having cracks, with a percent of pass of only 30%, while the connection loop chain bend processed by the method of the present invention had no cracks, with a percent of pass of 100%.
2. Performing ray inspection on the welding seams, and finding that about 20 percent of welding seams have incomplete penetration and other defects which influence the use after the ring chain processed by the traditional method is inspected; the circular chain processed by the method is combined with manual tungsten electrode gas shielded welding, so that defects are not found, and the quality of a welding seam is obviously improved.
3. Through size detection, an automatic chain knitting machine is used for stretching the bending part of the connecting ring chain, and the diameter size of the ring chain is obviously smaller; the chain processed by the method has accurate size and greatly improves the meshing quality with the chain wheel.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A preparation method of a connecting ring chain for a control rod system is characterized by comprising the following steps:
s1, machining single chains and grooves: cutting the metal forging into a size suitable for single-chain machining, machining and molding the single chain by using metal cutting equipment, and machining a groove on the single chain;
s2, chaining: connecting a plurality of single chains in series into a ring chain by using a groove;
s3, groove welding: welding is carried out on each groove to completely close and connect the grooves.
2. The method as set forth in claim 1, wherein the forging ratio of the metal forging of step S1 is 2 or more.
3. The method as set forth in claim 1, wherein the parameters of the bevel in step S3 are: the bevel is 90 degrees.
4. The method of claim 1, further comprising performing a post-weld heat treatment on the welded link chain: heating the ring chain in the furnace to a temperature not higher than 1200 ℃, and cooling in air after proper heat preservation.
5. The method as set forth in claim 1, further comprising performing weld grinding after the groove welding and performing nondestructive inspection on the weld.
6. The method as set forth in claim 4, wherein the method comprises shot peening the heat-treated link chain.
7. The method for manufacturing a connecting link chain for a control rod system as set forth in claim 6, wherein the shot peening treatment is performed one or more times.
8. The method as set forth in claim 1, further comprising performing a final nondestructive inspection after completion of the link chain.
9. A connecting link chain manufactured by the method for manufacturing a connecting link chain for a control rod system as set forth in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010573280.0A CN111687605B (en) | 2020-06-22 | 2020-06-22 | Preparation method of connecting ring chain for control rod system and connecting ring chain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010573280.0A CN111687605B (en) | 2020-06-22 | 2020-06-22 | Preparation method of connecting ring chain for control rod system and connecting ring chain |
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| CN111687605A true CN111687605A (en) | 2020-09-22 |
| CN111687605B CN111687605B (en) | 2021-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523178A (en) * | 2021-06-29 | 2021-10-22 | 江苏正申索具有限公司 | Production process of special chain for high-temperature reactor |
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| EP1222977A2 (en) * | 2001-01-12 | 2002-07-17 | Bordin Group S.R.L. | Method for the manufacture of ornamental chains |
| CN101264564A (en) * | 2008-05-08 | 2008-09-17 | 谢鸿刚 | Manufacturing method for quick-release type hoisting connection ring body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113523178A (en) * | 2021-06-29 | 2021-10-22 | 江苏正申索具有限公司 | Production process of special chain for high-temperature reactor |
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| CN111687605B (en) | 2021-09-07 |
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