CN110860816A - Plate for manufacturing hook claw on control rod driving mechanism and manufacturing method - Google Patents
Plate for manufacturing hook claw on control rod driving mechanism and manufacturing method Download PDFInfo
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- CN110860816A CN110860816A CN201911326837.4A CN201911326837A CN110860816A CN 110860816 A CN110860816 A CN 110860816A CN 201911326837 A CN201911326837 A CN 201911326837A CN 110860816 A CN110860816 A CN 110860816A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/10—Construction of control elements
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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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Abstract
The invention discloses a plate for manufacturing a hook claw on a control rod driving mechanism and a manufacturing method thereof. The manufacturing method comprises a tooth profile preparation process, wherein the tooth profile preparation process comprises the following steps: the method comprises the steps of obtaining a base material for processing the tooth shape on a base block, and then processing the base material to obtain the required tooth shape, wherein the raw material of the base material is a blocky welding block made of wear-resistant materials, and the welding block is connected to the base block through welding. By adopting the plate and the manufacturing method provided by the scheme to produce the control rod driving mechanism claw, the welding quality between the base body and the wear-resisting layer can be ensured by controlling the intercrystalline corrosion tendency near the welding fusion line, the overall quality of the claw is improved, the potential safety hazard is eliminated, and therefore the reliability and the service life of the CRDM are effectively guaranteed.
Description
Technical Field
The invention relates to the technical field of parts of a control rod driving mechanism of a nuclear reactor, in particular to a plate for manufacturing a hook claw on the control rod driving mechanism and a manufacturing method thereof.
Background
A pressurized water reactor Control Rod Driving Mechanism (CRDM) is one of key equipment of a nuclear power station, and the principle of the CRDM is that a claw component is driven to generate corresponding action by controlling an electromagnetic field, so that a driving rod component is driven to drive a control rod component to move up and down in a reactor core, and a series of important functions of starting and stopping the reactor, adjusting or maintaining the reactor core power, rapidly stopping the reactor under an accident condition and the like are realized.
Each set of CRDM for the active pressurized water reactor nuclear power station contains 6 independent claws. The hook claw is the most critical part in the CRDM, and the hook claw is provided with a single or double tooth-shaped part which needs to have the performances of wear resistance, impact resistance, corrosion resistance, high temperature resistance and the like, which are important to the service life and the operation reliability of the CRDM, so the manufacturing requirement and the inspection standard of the tooth-shaped part of the hook claw are very strict.
In the existing pressurized water reactor nuclear power station, most of the tooth-shaped parts of the CRDM claw adopt a mode of directly overlaying Stellite6 alloy on a matrix material of austenitic stainless steel, and the technology has the advantages of simple and convenient operation, mature process and wide application. At present, 90% of the hooks for nuclear power in China adopt the process, namely, Stellite6 wear-resistant alloy welding materials are cladded on the prefabricated part of the hook in a manual oxyacetylene welding mode to form a blank of a tooth-shaped part of the hook, and then the tooth shape required on the hook is obtained through subsequent forming processing.
Further optimizing the preparation process of the nuclear reactor control rod driving mechanism hook to ensure the manufacturing quality and the service life of the hook is an important direction for the technicians in the field to optimize the hook manufacturing technology.
Disclosure of Invention
Aiming at the technical problems that the further optimization of the preparation process of the control rod driving mechanism hook of the nuclear reactor is used for ensuring the manufacturing quality and the service life of the hook and is an important direction for the technical personnel in the field to optimize the hook manufacturing technology, the invention provides a plate for manufacturing the hook on the control rod driving mechanism and a manufacturing method thereof. By adopting the plate and the manufacturing method provided by the scheme to produce the control rod driving mechanism claw, the welding quality between the base body and the wear-resisting layer can be ensured by controlling the intercrystalline corrosion tendency near the welding fusion line, the overall quality of the claw is improved, the potential safety hazard is eliminated, and therefore the reliability and the service life of the CRDM are effectively guaranteed.
In order to solve the problems, the invention provides a plate material for manufacturing a hook claw on a control rod driving mechanism and a manufacturing method thereof, which solve the problems by the following technical points: the plate comprises a base body block serving as a hook base body and a blocky welding block made of wear-resistant materials, wherein the welding block is connected to the base body block in a welding mode and serves as a tooth-shaped base material for subsequent processing of the hook after welding is completed.
In the existing manufacturing process of the control rod drive mechanism, the base material is generally austenitic stainless steel, and as for obtaining the tooth shape on the hook jaw, the existing technology generally obtains a wear-resistant alloy layer on the hook jaw base body in a surfacing mode, and then processes the required tooth shape on the wear-resistant alloy layer. Taking the material of the overlaying layer as the Stellite alloy as an example, in the process of overlaying the Stellite alloy, as the continuous heat input and heat input time is longer (the overlaying time is more than 1.5 hours), the temperature of the matrix is higher (more than 450 ℃), the austenitic stainless steel material usually adopted by the matrix is in the sensitization temperature region of the austenitic stainless steel for a long time, so that the matrix inevitably precipitates carbides at the grain boundary, and a carburized layer near the position of a welding fusion line has a remarkable intergranular corrosion tendency, so that the current domestic and foreign overlaying type hook products all have the intergranular corrosion tendency near the junction of the overlaying layer and the matrix, and a gold phase diagram of a specific embodiment is shown in fig. 1.
During the service period of the control rod driving mechanism, the tooth-shaped part on the hook claw needs to bear over 600 ten thousand times of strong impact and abrasion at least in the service life of 60 years, so the intercrystalline corrosion tendency existing near the welding fusion line substantially influences the quality and the service life of the hook claw.
In this aspect, by providing the plate material for use in the production of the hook, the plate material including a base block as a base of the hook and a welded block as a base material for forming a tooth profile, the welded block is connected to the base block by welding at the time of production of a specific hook, that is: the base material for forming the tooth profile is obtained on the base block only by welding the welding block on the base block, and because the welding has a connection effect different from that of a cladding layer obtained by surfacing, the intergranular corrosion tendency near a welding fusion line is thoroughly eliminated or effectively reduced by the heat introduction duration determined by no surfacing mode, so that the overall quality of the claw can be improved, the potential safety hazard is eliminated, and the reliability and the service life of the CRDM are effectively ensured. If the electron beam welding in the prior art is adopted to realize the welding connection, the economy is good, and the inter-crystal corrosion tendency near a welding fusion line can be completely avoided.
As a further technical scheme of the plate:
as a desirable material realization form for manufacturing the claw, the base block is made of austenitic stainless steel, and the welding block is made of wear-resistant alloy material, such as Stellite alloy block. Other materials may be used as the substrate block and other wear resistant materials may be used as the weld block as will be appreciated by those skilled in the art.
For when realizing base block and welding piece welding, reduce the location degree of difficulty between them and improve positioning accuracy, set up to: the base body block is also provided with an embedding groove, and the groove surface of the embedding groove is used as a matching surface matched with the welding block on the base body block.
In order to conveniently finish welding and obtain ideal welding quality when realizing welding of a base block and a welding block, the welding quality is set as follows: the bottom of the embedding groove is a slope, and the slope bottom of the slope is positioned on the edge of the substrate block. This scheme is convenient for realize: when base member piece and welding piece both cooperate, through domatic, be convenient for obtain the welding groove formula clearance that the opening side is located the base member piece outside between the two, through the clearance, for example through forms such as hot melt welding, fill welding, under the condition as few as possible of welding energy introduction for have sufficient joint strength between base member piece and the welding piece so as to do benefit to the life of hook, conveniently implement the welding.
Can realize from the multidirection for the realization the welding to improve the convenience of welding, do benefit to welding quality and welding efficiency through reducing single clearance opening side width, set up to: the slope surface is provided with a plurality of slope surfaces, and the slope bottom of each slope surface is positioned on the edge of the substrate block. Preferably, the slope is set as follows: the end parts of the formed tooth shape in the length direction are used as a left end and a right end, the number of the slope surfaces can be two, the middle parts of the left connecting line and the right connecting line are used as slope tops, and the left end and the right end are respectively used as slope bottoms of one slope surface. This scheme is more applicable to the filling and welds.
For utilizing electron beam welding, under the condition that energy introduction is less, utilize the strong characteristics of penetrating power that electron beam welding has, the quick connection of accomplishing the welding piece on the base member piece sets up as: the groove surface of the embedding groove is consistent with the matching surface of the base block, which is matched with the welding block, in shape: after the welding block is embedded into the embedding groove, the matching surface of the welding block, which is matched with the base block, is completely attached to the groove surface of the embedding groove.
Meanwhile, the scheme also provides a manufacturing method for manufacturing the hook claw on the control rod driving mechanism, which comprises a tooth profile preparation process, wherein the tooth profile preparation process comprises the following steps: the method comprises the steps of obtaining a base material for processing a tooth shape on a base block serving as a hook claw base body, and then processing the base material to obtain the required tooth shape, wherein the raw material of the base material is a welding block which is made of a wear-resistant material and is in a block shape, and the welding block is connected to the base block through welding to obtain the base material for processing the tooth shape on the base block. In this embodiment, after the base block is welded to the welding block, the obtained assembly is used to prepare the hook, and the welding block is used to prepare the tooth-shaped base material, so that the welding block is connected to the base block by welding when manufacturing the specific hook, that is: the base material for forming the tooth profile is obtained on the base block only by welding the welding block on the base block, and because the welding has a connection effect different from that of a cladding layer obtained by surfacing, the intergranular corrosion tendency near a welding fusion line is thoroughly eliminated or effectively reduced by the heat introduction duration determined by no surfacing mode, so that the overall quality of the claw can be improved, the potential safety hazard is eliminated, and the reliability and the service life of the CRDM are effectively ensured.
Specifically, for a weld nugget of a cobalt-based alloy material, the source of the weld nugget may also be from the weld overlay: for example, a weld overlay is built up at a welding station, and then the weld overlay is peeled off from the welding station by means of, for example, cutting, to obtain a welded block. However, unlike the prior art in which a build-up layer as a base material for machining a tooth profile is directly formed on a base block made of, for example, stainless steel, the weld block obtained by the separation can be made of an alloy entirely of the same material, and therefore, the base block and the weld block are finally joined by welding, and there is no tendency for intergranular corrosion to occur in the vicinity of the position of a weld fusion line during the build-up welding directly on the base block in the prior art.
The manufacturing method for manufacturing the control rod driving mechanism upper hook comprises the following steps:
as a technical scheme capable of realizing reliable welding connection in a shorter time, the welding connection adopts a high-energy-density beam welding mode. When the technical scheme is specifically applied, the welding fusion layer can be obtained in a self-fusing mode and a welding flux filling mode, and aiming at the design size of the existing claw, the complete welding fusion layer connecting surface can be obtained, the welding quality is high, and the welding can be completed in as short a time as possible.
For conveniently realizing welding and obtaining better welding quality, the method comprises the following steps: when the welding connection is carried out, a gap is reserved between the base block and the welding block, and the gap is filled with molten metal fluid in the welding process to complete the welding.
As a material selection scheme of excellent performance, for doing benefit to welding quality and welding efficiency simultaneously, set up to: the base block is made of austenitic stainless steel, the welding block is made of wear-resistant alloy materials, for example, a Stellite alloy block is adopted, electron beam welding is adopted for welding connection, the welding block is matched with the base block, when preparation is made for implementing the electron beam welding, the welding block and the base block are completely attached to one another through matching surfaces, which are used for being matched with the other, on the welding block and the base block.
In order to ensure the product percent of pass, the method is set as follows: before welding the welding block, the method further comprises a detection process, wherein the detection process comprises the steps of performing hardness detection and flaw detection on the welding block, and the welding block meeting the detection requirement is used for welding with the base block.
The invention has the following beneficial effects:
in the technical scheme of the plate material provided by the scheme, the plate material is used for preparing the hook claw, and comprises a base body block as a hook claw base body and a welding block as a tooth profile forming base body, and when the specific hook claw is manufactured, the welding block is connected to the base body block in a welding mode, namely: the base material for forming the tooth profile is obtained on the base block only by welding the welding block on the base block, and because the welding has a connection effect different from that of a cladding layer obtained by surfacing, the intergranular corrosion tendency near a welding fusion line is thoroughly eliminated or effectively reduced by the heat introduction duration determined by no surfacing mode, so that the overall quality of the claw can be improved, the potential safety hazard is eliminated, and the reliability and the service life of the CRDM are effectively ensured.
In the manufacturing method provided by the present aspect, after the base block and the welding block are welded, the obtained assembly is used for manufacturing the hook, and the welding block is used for manufacturing the tooth-shaped base material, so that the welding block is connected to the base block by welding when manufacturing the specific hook, that is: the base material for forming the tooth profile is obtained on the base block only by welding the welding block on the base block, and because the welding has a connection effect different from that of a cladding layer obtained by surfacing, the intergranular corrosion tendency near a welding fusion line is thoroughly eliminated or effectively reduced by the heat introduction duration determined by no surfacing mode, so that the overall quality of the claw can be improved, the potential safety hazard is eliminated, and the reliability and the service life of the CRDM are effectively ensured.
Drawings
Fig. 1 is a diagram showing a metallographic view of a weldment obtained in an embodiment of the prior art in which a base material is formed as a tooth shape on a base material block by using a build-up welding technique, wherein the upper left portion corresponds to the base material and the lower right portion corresponds to a build-up welding layer, as is apparent from the metallographic view: a decarburized layer is present near the junction of the two;
fig. 2 is a diagram of a gold phase of a welded joint obtained after welding a base material block and a welding block by electron beam welding in an embodiment of the plate and the manufacturing method provided by the present invention, in the diagram, a left portion corresponds to the base material, a right portion is Stellite alloy, and a welding fusion line is formed between the two, as clearly seen from the diagram: no intercrystalline corrosion tendency exists near the substrate and the welding fusion line;
FIG. 3 is a schematic view of the configuration of a base block and a weld block in combination or a resultant assembly after welding, in accordance with an embodiment of the present invention, showing a plate material for fabrication of a finger of a control rod drive mechanism, wherein the dashed lines indicate the final finger formation profile;
FIG. 4 is a schematic view of the structure of FIG. 3 after completion of the forming process;
FIG. 5 is a partial schematic structural view of the structure of FIG. 3, in cross-section, illustrating one embodiment of a damascene trench having two sloped surfaces;
fig. 6 is a partial structural view of the structure shown in fig. 3, which is a sectional view for reflecting the form of a damascene trench having a slope, unlike fig. 5.
The labels in the figure are respectively: 1. base block, 2, welding block, 3, embedding groove.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:
example 1:
as shown in fig. 1 to 6, the plate material for manufacturing the hook on the control rod drive mechanism comprises a base block 1 as a hook base body and a block-shaped welding block 2 made of wear-resistant material, wherein the welding block 2 is connected to the base block 1 by welding, and after the welding is completed, the welding block 2 is used as a tooth-shaped base material on the hook to be processed subsequently.
In the existing manufacturing process of the control rod drive mechanism, as for obtaining the tooth shape on the hook, the prior art generally obtains a wear-resistant alloy layer on a hook substrate by means of overlaying, and then processes the required tooth shape on the wear-resistant alloy layer. Taking the material of the overlaying layer as the Stellite alloy as an example, in the process of overlaying the Stellite alloy, as the continuous heat input and heat input time is longer (the overlaying time is more than 1.5 hours), the temperature of the matrix is higher (more than 450 ℃), the austenitic stainless steel material usually adopted by the matrix is in the sensitization temperature region of the austenitic stainless steel for a long time, so that the matrix inevitably precipitates carbides at the grain boundary, and a carburized layer near the position of a welding fusion line has a remarkable intergranular corrosion tendency, so that the current domestic and foreign overlaying type hook products all have the intergranular corrosion tendency near the junction of the overlaying layer and the matrix, and a gold phase diagram of a specific embodiment is shown in fig. 1.
During the service period of the control rod driving mechanism, the tooth-shaped part on the hook claw needs to bear over 600 ten thousand times of strong impact and abrasion at least in the service life of 60 years, so the intercrystalline corrosion tendency existing near the welding fusion line substantially influences the quality and the service life of the hook claw.
In this embodiment, by providing the plate material for making the hook, the plate material including the base block 1 as the hook base and the welding block 2 as the tooth forming base, the welding block 2 is connected to the base block 1 by welding at the time of manufacturing a specific hook, that is: the base material for forming the tooth profile is obtained on the base block 1 only by welding the welding block 2 on the base block 1, and because the welding has a connection effect different from that of surfacing to obtain a cladding layer, the unavoidable intercrystalline corrosion tendency (shown in figure 2) near a surfacing fusion line in the prior art is thoroughly eliminated or can be effectively reduced by the heat introduction duration determined by no surfacing mode, so that the overall quality of the claw can be improved, the potential safety hazard can be eliminated, and the reliability and the service life of the CRDM can be effectively ensured.
Example 2:
in this embodiment, as a preferable realization form of the material for manufacturing the hook claw, the base block 1 is made of austenitic stainless steel, and the welded block 2 is a Stellite alloy block (cobalt-based alloy). Other materials may be used for the base block 1 and other wear resistant materials for the weld block 2 as will be apparent to those skilled in the art.
For when realizing base block 1 and welding piece 2 welding, reduce the location degree of difficulty between them and improve positioning accuracy, set up to: the base body block 1 is also provided with an embedding groove 3, and the groove surface of the embedding groove 3 is used as a matching surface on the base body block 1 for matching with the welding block 2.
Example 3:
the embodiment is further limited on the basis of the technical scheme provided by the embodiment 1, and in order to conveniently complete welding and obtain ideal welding quality when the base block 1 and the welding block 2 are welded, the method is characterized in that: the bottom of the embedding groove 3 is a slope, and the slope bottom of the slope is positioned on the edge of the substrate block 1. This scheme is convenient for realize: when the base block 1 and the welding block 2 are matched, a welding groove type gap with the opening side positioned on the outer side of the base block 1 can be conveniently obtained between the base block 1 and the welding block 2 through the slope, and through the gap, for example, through the forms of hot melt welding, filling welding and the like, under the condition that the introduction of welding energy is as small as possible, the base block 1 and the welding block 2 have enough connection strength so as to be beneficial to the service life of the hook claw and conveniently implement welding.
Example 4:
this embodiment is further defined on the basis of embodiment 3, and in order to realize that the welding can be realized from multiple directions, in order to improve the convenience of welding, and to facilitate the welding quality and the welding efficiency by reducing the width of the opening side of the single gap, it is configured as follows: the slope surface is provided with a plurality of slope surfaces, and the slope bottom of each slope surface is positioned on the edge of the substrate block 1. Preferably, the slope is set as follows: the end parts of the formed tooth shape in the length direction are used as a left end and a right end, the number of the slope surfaces can be two, the middle parts of the left connecting line and the right connecting line are used as slope tops, and the left end and the right end are respectively used as slope bottoms of one slope surface.
Example 5:
the embodiment provides a manufacturing method for manufacturing a claw on a control rod drive mechanism, which comprises a tooth profile preparation process, wherein the tooth profile preparation process comprises the following steps: a base material for processing a tooth profile is obtained on a base block 1 as a hook base, and then the base material is processed to obtain a required tooth profile, wherein the base material is a welding block 2 which is made of a wear-resistant material and is in a block shape, and the welding block 2 is connected to the base block 1 by welding to obtain the base material for processing the tooth profile on the base block 1. In this embodiment, after the base block 1 and the welding block 2 are welded, the obtained assembly is used for preparing the hook, and the welding block 2 is used as a base material for preparing the tooth shape, so that when the specific hook is manufactured, the welding block 2 is connected to the base block 1 by welding, that is: the base material for forming the tooth profile is obtained on the base body block 1 only by welding the welding block 2 on the base body block 1, and because the welding has the connection effect of obtaining a cladding layer by distinguishing from surfacing, the intergranular corrosion tendency near a welding fusion line is thoroughly eliminated or effectively reduced by the heat introduction duration determined by no surfacing, so that the overall quality of the claw can be improved, the potential safety hazard can be eliminated, and the reliability and the service life of the CRDM can be effectively ensured.
Specifically, as for the welding block 2 made of the cobalt-based alloy material, the source of the welding block 2 can also come from overlaying: for example, a weld overlay is formed at a welding station, and then the weld overlay is peeled off from the welding station by, for example, machining, to obtain a welded block 2. However, unlike the conventional technique in which a build-up layer as a base material for machining a tooth shape is directly formed on a base block 1 made of, for example, stainless steel, the weld block 2 obtained by peeling off may be an alloy of the same material as the whole, so that the base block 1 and the weld block 2 are finally joined by welding, and there is no tendency of intergranular corrosion occurring in the vicinity of the weld fusion line during the build-up welding directly on the base block 1 in the conventional technique.
Example 6:
the embodiment is further limited on the basis of the embodiment 5, and as a technical scheme capable of realizing reliable welding connection in a shorter time, the welding connection adopts a high-energy-density beam welding mode. When the technical scheme is specifically applied, the welding fusion layer can be obtained in a self-fusing mode and a welding flux filling mode, and aiming at the design size of the existing claw, the complete welding fusion layer connecting surface can be obtained, the welding quality is high, and the welding can be completed in as short a time as possible.
For conveniently realizing welding and obtaining better welding quality, the method comprises the following steps: when the welding connection is carried out, a gap is reserved between the base block 1 and the welding block 2, and the gap is filled with molten metal fluid in the welding process to complete the welding.
As a material selection scheme with excellent performance, the method comprises the following steps: the base block 1 is made of austenitic stainless steel, and the welding block 2 is a Stellite alloy block.
In order to ensure the product percent of pass, the method is set as follows: before welding the welding block 2, the method further comprises a detection process, wherein the detection process comprises the step of carrying out hardness detection and flaw detection on the welding block 2, and the welding block 2 meeting the detection requirement is used for welding with the base block 1.
Example 7:
the embodiment provides a specific implementation mode of the plate and the manufacturing method based on the scheme, which comprises the following steps: a method for forming a tooth profile of a finger with elimination of intergranular corrosion, for obtaining a suitable wear resistant layer on a base of a preformed tooth-shaped portion of a finger part, comprising the steps of:
s1, processing a small prefabricated platform on the substrate block 1 as an embedding groove 3, and referring to FIG. 3;
and S2, placing a wear-resistant alloy block (refer to figure 3) which is suitable in size and shape and serves as the welding block 2 on the small prefabricated platform. The abrasion-resistant alloy block is a Stellite alloy block, and other hard abrasion-resistant alloy materials can be adopted;
s3, completely filling the gap between the small prefabricated platform and the wear-resistant alloy block by adopting a high-energy-density beam welding mode, such as electron beam welding, laser welding and the like, so as to form a complete claw blank body shown in figure 3;
and S4, machining the hook jaw blank into the hook jaw finished product shown in the figure 4 finally by adopting a mechanical cutting machining mode.
In order to ensure the product percent of pass, optimize the preparation cost and obtain the welding block 2 with excellent performance, the wear-resistant alloy block described in the S2 is prepared according to the following method:
1. carrying out oxyacetylene overlaying welding of a Stellite6 alloy on the surface of an austenitic stainless steel, and processing the Stellite6 alloy overlaying welding layer into a wear-resistant alloy block described in S2 by adopting a mechanical cutting mode after the overlaying welding cladding layer reaches a certain thickness and volume, wherein the wear-resistant alloy block is completely Stellite6 alloy and does not have any part of the austenitic stainless steel.
2. After the wear-resistant alloy block is obtained, hardness detection and flaw detection can be carried out on the wear-resistant alloy block to remove defective products. The flaw detection mode can adopt one or more of UT, PT and RT.
The embodiment has the following beneficial effects:
according to the forming method of the claw tooth shape capable of eliminating intergranular corrosion, the high-energy-density beam welding mode is adopted to replace an oxyacetylene surfacing welding mode in the prior art to realize reliable connection between the base block 1 serving as the claw base body and the welding block 2 of the tooth-shaped base material part wear-resistant alloy, and the unavoidable intergranular corrosion tendency near a surfacing welding fusion line in the prior art is thoroughly eliminated, so that the welding quality between the base body and the wear-resistant layer is well ensured, the overall quality of the claw is improved, the quality hidden danger is eliminated, and the reliability of CRDM is effectively ensured.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.
Claims (10)
1. The plate for manufacturing the hook on the control rod driving mechanism comprises a base body block (1) serving as a hook base body and is characterized by further comprising a welding block (2) which is made of wear-resistant materials and is blocky, wherein the welding block (2) is connected to the base body block (1) in a welding mode, and after the welding is completed, the welding block (2) serves as a tooth-shaped base material on the hook in subsequent processing.
2. A plate for the manufacture of a control rod drive mechanism upper finger according to claim 1, characterized in that the base block (1) is of austenitic stainless steel and the weld block (2) is of wear resistant alloy material.
3. A plate material for the manufacture of a control rod drive mechanism upper hook according to claim 1, characterized in that the base block (1) is further provided with a mosaic slot (3), and the slot surface of the mosaic slot (3) is used as a matching surface on the base block (1) for matching with the welding block (2).
4. A plate for the manufacture of a hook for a control rod drive mechanism according to claim 3, wherein the bottom of the mosaic slot (3) is a sloping surface and the sloping bottom of the sloping surface is located on the edge of the matrix block (1); the slope surface is provided with a plurality of slope surfaces, and the slope bottom of each slope surface is positioned on the edge of the substrate block (1).
5. A plate for the manufacture of a finger for a control rod drive mechanism as set forth in claim 3, characterized in that the groove surface of the mosaic groove (3) is contoured to the mating surface of the base block (1) for the mating with the weld block (2): after the welding block (2) is embedded into the embedding groove (3), the matching surface on the welding block (2) for matching with the substrate block (1) is completely attached to the groove surface of the embedding groove (3).
6. A manufacturing method for manufacturing a hook claw on a control rod driving mechanism comprises a tooth profile preparation process, wherein the tooth profile preparation process comprises the following steps: the method is characterized in that a base material for processing the tooth shape is obtained on a base block (1) as a hook claw base body, and then the base material is processed to obtain the required tooth shape, wherein the raw material of the base material is a welding block (2) which is made of wear-resistant materials and is in a block shape, and the welding block (2) is connected on the base block (1) through welding to obtain the base material for processing the tooth shape on the base block (1).
7. The method as set forth in claim 6, wherein the weld joint is a high energy density beam weld.
8. The manufacturing method for the fabrication of the knuckle for a control rod drive mechanism as recited in claim 7, wherein a gap is reserved between the base block (1) and the weld block (2) when the welding connection is performed, and the welding is performed by filling the gap with molten metal fluid during the welding process.
9. The manufacturing method for the control rod drive mechanism upper hook according to claim 6, characterized in that the material of the base block (1) is austenitic stainless steel, the welding block (2) is wear-resistant alloy material, the welding connection is electron beam welding, and when the welding block (2) is matched with the base block (1), and when preparing for performing electron beam welding, the welding block (2) and the base block (1) are both provided with matching surfaces for matching with the other one and completely joint with the other one.
10. The manufacturing method for manufacturing the knuckle for a control rod drive mechanism as recited in claim 6, further comprising a detection process for performing hardness detection and flaw detection on the welded block (2) before welding the welded block (2), wherein the welded block (2) meeting the detection requirement is used for welding with the base block (1).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911326837.4A CN110860816A (en) | 2019-12-20 | 2019-12-20 | Plate for manufacturing hook claw on control rod driving mechanism and manufacturing method |
| PCT/CN2020/135607 WO2021121139A1 (en) | 2019-12-20 | 2020-12-11 | Plate and method for producing claws on a control rod drive mechanism |
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| CN201911326837.4A CN110860816A (en) | 2019-12-20 | 2019-12-20 | Plate for manufacturing hook claw on control rod driving mechanism and manufacturing method |
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| CN110860816A true CN110860816A (en) | 2020-03-06 |
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| CN201911326837.4A Pending CN110860816A (en) | 2019-12-20 | 2019-12-20 | Plate for manufacturing hook claw on control rod driving mechanism and manufacturing method |
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| WO (1) | WO2021121139A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021121139A1 (en) * | 2019-12-20 | 2021-06-24 | 李文娟 | Plate and method for producing claws on a control rod drive mechanism |
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