CN110744061B - Reactor core filter screen composite manufacturing method and system - Google Patents

Reactor core filter screen composite manufacturing method and system Download PDF

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Publication number
CN110744061B
CN110744061B CN201910940798.0A CN201910940798A CN110744061B CN 110744061 B CN110744061 B CN 110744061B CN 201910940798 A CN201910940798 A CN 201910940798A CN 110744061 B CN110744061 B CN 110744061B
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filter screen
module
printing
screen
net
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CN110744061A (en
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陈亮
刘彦章
张峰
赵建光
李石磊
李学军
黄弋力
谭磊
刘倩
董义令
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
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    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F1/0003—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract

The invention provides a composite manufacturing method and a composite manufacturing system for a reactor core filter screen, which comprises the following steps: step S1, preparing a screen surface of the filter screen by a 3D printing technology; step S2, preparing a base corresponding to the screen surface of the filter screen; step S3, assembling and welding the screen surface of the filter screen and the base; and step S4, carrying out surface inspection on the welded seam formed by welding to ensure that the welded seam meets the inspection standard. The invention reduces the number of components and the assembly among the components, and reduces the failure probability of the reactor core filter screen assembly; simplifying the manufacturing process of the screen surface of the filter screen; effectively reducing the risks of deformation and falling of the net surface and damage of the net surface.

Description

Reactor core filter screen composite manufacturing method and system
Technical Field
The invention relates to the field of composite manufacturing of a reactor core filter screen assembly of a reactor pressure vessel of a pressurized water reactor nuclear power plant, in particular to a composite manufacturing method and a composite manufacturing system of a reactor core filter screen.
Background
The reactor core filter screen assembly is arranged on a lower supporting plate of a lower reactor internals during cold test and hot test (the fuel assembly corresponds to the position, foreign matters and particles in a circulating water loop are filtered and cleaned under the filtering action of the screen surface of the reactor core filter screen assembly, and the foreign matters and the particles are prevented from entering reactor coolant system equipment to cause equipment damage.
In the prior art, as shown in fig. 1, a reactor core filter screen assembly is composed of a base 1, a filter screen 2, a reinforcing screen 3, a hold-down strip 4, a cushion block 5, a large head screw 6, a handle 7 and other parts, and is fixed on a lower support plate 12 of a reactor internals through a screw 8, a nut 9, a lock washer 10 and an anti-rotation block 11. The pressing strip, the filter screen and the base are welded into a whole through a manual argon arc welding process in an intermittent welding mode.
In the conventional technology, the following technical problems exist: a) the reactor core filter screen assembly comprises a base 1, a filter screen 2, a reinforcing screen 3, a pressing strip 4, a cushion block 5, a large-head screw 6, a handle 7 and other parts, so that the failure probability of the parts is increased; b) the filter screen and the reinforcing net are complex in manufacturing process, and the filter screen is formed by weaving austenitic stainless steel wires in a warp-weft mode. And brazing the intersection point of each steel wire in the filter screen. The reinforcing net is formed by weaving austenitic stainless steel wires in a warp-weft mode, the reinforcing net is cut to the size specified in the drawing, and the center of the reinforcing net needs to be the center of a certain mesh. The manufacturing process of the filter screen and the reinforcing screen is complex, and the problems of high quality of the filter screen and the reinforcing screen are the dimensional accuracy and the brazing quality. c) In the functional test and the service process, the filter screen manufactured by the traditional process is easy to deform, the screen surface of the reinforcing screen is easy to fall off from the base and the screen surface is easy to damage.
Therefore, in order to solve the technical problems of complex manufacturing process of the filter screen and the reinforcing screen, deformation of the screen surface, falling off of the filter screen from the base, damage risk of the screen surface and the like in the prior art, a method and a system for manufacturing the reactor core filter screen are urgently needed.
Disclosure of Invention
The invention aims at the technical problems of complex manufacturing process of the filter screen and the reinforcing net, deformation of the net surface, falling off of the filter screen from the base, risk of damage to the net surface and the like in the prior art. A composite manufacturing method and system for a reactor core filter screen are provided.
The technical scheme provided by the invention for the technical problem is as follows: a composite manufacturing method of a reactor core filter screen comprises the following steps: step S1, preparing a screen surface of the filter screen by a 3D printing technology; step S2, preparing a base corresponding to the screen surface of the filter screen; step S3, assembling and welding the mesh surface of the filter screen and the base; and step S4, carrying out surface inspection on the welded seam formed by welding to ensure that the welded seam meets the inspection standard.
In the above method for manufacturing a core screen in combination, the step 1 includes: step S11, purchasing powder, performing powder inspection on the purchased powder, purchasing the powder again if the powder does not meet the requirement, and entering step S12 if the powder meets the requirement; step S12, setting 3D printing parameters, and printing the powder according to the 3D printing parameters to form a sample; step S13, detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property do not meet the requirement, returning to the step S12 to reset the 3D printing parameters, and if the porosity and the mechanical property meet the requirement, entering the step S14; step S14, designing a printing scheme of the net surface of the filter net; step S15, printing and forming a screen surface of the filter screen and a furnace sample on the substrate according to the printing scheme; step S16, carrying out integral heat treatment on the substrate, the screen surface of the filter screen and the furnace sample; step S17, cutting and separating the heat-treated mesh surface of the filter screen, the furnace sample and the substrate; step S18, post-processing the net surface of the filter net after cutting and separating; step S19, carrying out filter screen surface inspection on the post-processed filter screen surface and the furnace sample, and if the requirements are met, entering step S3; if not, the process returns to step S14.
In the above method for manufacturing a core screen composite according to the present invention, the step S2 includes: step S21, purchasing blanks needed by the base; step S22, machining the blank to form a base; and step S23, performing surface inspection on the base, returning to step S21 if the requirement is not met, and entering step S3 if the requirement is met.
In the composite manufacturing method of the reactor core filter screen, the 3D printing technology is a selective laser sintering technology.
In the composite manufacturing method of the reactor core filter screen, the screen surface of the prepared filter screen is of a double-layer lattice structure.
In the core screen composite manufacturing method of the present invention, the screen surface inspection in step S19 includes an industrial computer tomography inspection, a liquid penetration inspection, and a visual inspection.
In the core filter screen composite manufacturing method of the present invention, the post-treatment in the step S18 is a sand blasting treatment for ensuring the surface roughness of the screen surface of the filter screen and improving the flow resistance.
In the core screen composite manufacturing method of the present invention, the blank in step S21 is a forged or cast part.
In another aspect, the present invention further provides a core filter screen composite manufacturing system, including: the filter screen surface preparation module is used for preparing a filter screen surface by a 3D printing technology; the base preparation module is used for preparing a base corresponding to the screen surface of the filter screen; the assembly welding module is connected with the filter screen surface preparation module and the base preparation module and is used for assembling and welding the filter screen surface and the base; and the welding seam inspection module is connected with the assembly welding module and used for carrying out surface inspection on the welding seam formed by welding and ensuring that the welding seam meets the inspection standard.
In the above system for compositely manufacturing a reactor core filter screen, the filter screen surface preparation module includes: the powder purchasing module is used for purchasing powder and carrying out powder inspection on the purchased powder, if the powder does not meet the requirement, the powder is purchased again, and if the powder meets the requirement, the powder enters the printing parameter setting module; the printing parameter setting module is connected with the powder purchasing module and used for setting 3D printing parameters and printing the powder according to the 3D printing parameters to form a sample; the sample detection module is connected with the printing parameter setting module and is used for detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property of the sample do not meet the requirements, the sample detection module returns to the printing parameter setting module to reset the 3D printing parameters, and if the porosity and the mechanical property of the sample do not meet the requirements, the sample detection module enters the printing scheme design module; the printing scheme design module is connected with the sample detection module and is used for designing a printing scheme of the net surface of the filter screen; the printing module for the screen surface of the filter screen and the furnace sample is connected with the printing scheme design module and is used for printing and forming the screen surface of the filter screen and the furnace sample on the substrate according to the printing scheme; the heat treatment module is connected with the filter screen mesh surface and the furnace sample printing module and is used for carrying out integral heat treatment on the substrate, the filter screen mesh surface and the furnace sample; the cutting module is connected with the heat treatment module and is used for cutting and separating the heat-treated mesh surface of the filter screen, the furnace sample and the substrate; the post-processing module is connected with the cutting module and is used for post-processing the net surface of the filter screen after cutting and separating; the filter screen surface inspection module is connected with the post-processing module and is used for inspecting the filter screen surface of the post-processed filter screen and a furnace sample, and if the requirements are met, the filter screen surface inspection module enters the assembly welding module; if not, returning to the printing scheme design module.
In the core screen composite manufacturing system of the present invention, the base preparation module includes: the blank purchasing module is used for purchasing blanks required by the base; the machining module is connected with the blank purchasing module and used for machining the blank to form a base; and the base inspection module is connected with the machining module and used for inspecting the surface of the base, returning to the blank purchasing module if the requirement is not met, and entering the assembly welding module if the requirement is met.
In the reactor core filter screen composite manufacturing system, the 3D printing technology is a selective laser sintering technology.
In the reactor core filter screen composite manufacturing system, the prepared filter screen surface is of a double-layer lattice structure.
In the reactor core filter screen composite manufacturing system, the filter screen surface inspection of the filter screen surface inspection module comprises industrial computer tomography inspection, liquid penetration inspection and visual inspection.
In the reactor core filter screen composite manufacturing system, the post-treatment in the post-treatment module is sand blasting treatment, and is used for ensuring the surface roughness of the screen surface of the filter screen and improving the flow resistance.
In the reactor core filter screen composite manufacturing system, the blank in the blank purchasing module is a forged piece or a cast piece.
The technical scheme provided by the invention has the following beneficial effects: the filter screen surface is integrally molded by using a 3D printing technology, a cushion block and a large head screw are omitted, the number of filter screen components and the assembly among the components are reduced, and the failure probability of the reactor core filter screen assembly is reduced; the manufacturing process of the mesh surface of the filter screen is effectively simplified by the selective laser sintering technology; simultaneously, this application integrated into one piece's filter screen wire side is double-deck lattice structure, and traditional technology makes the wire side, can effectively reduce the wire side and warp, drop and the wire side damages the risk. Through the design, the technical problems that the manufacturing process of the filter screen and the reinforcing net is complex, the net surface is deformed, the filter screen falls off from the base, the risk of damage to the net surface and the like in the prior art are solved, and the performance of the filter screen of the reactor core of the nuclear power plant is effectively improved.
Drawings
FIG. 1 is a schematic illustration of a prior art installation of a nuclear power plant core screen;
FIG. 2 is a flow chart of a core filter screen composite manufacturing method according to an embodiment of the present invention;
FIG. 3 is a flowchart of step S1 according to an embodiment of the present invention;
FIG. 4 is a schematic view of a screen surface according to an embodiment of the present invention;
FIG. 5 is a flowchart of step S2 according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the net surface effect of the filter net prepared in the first embodiment of the present invention;
FIG. 7 is a schematic diagram of functional modules of a core filter screen composite manufacturing system according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of a filter screen surface preparation module of the core filter screen composite manufacturing system according to the second embodiment of the present invention;
fig. 9 is a schematic diagram of a base preparation module of a core screen composite manufacturing system according to a second embodiment of the present invention.
Detailed Description
In order to solve the technical problems of complex manufacturing process of the filter screen and the reinforcing screen, deformation of the screen surface, falling of the filter screen from the base, damage risk of the screen surface and the like in the prior art, the invention adopts a composite manufacturing method and a composite manufacturing system of the reactor core filter screen, and the core idea is as follows: the screen surface and the pressing strip of the filter screen are integrally molded by using a 3D printing technology, a cushion block and a large head screw are omitted, the number of filter screen components and the assembly among the components are reduced, and the failure probability of the reactor core filter screen assembly is reduced; the manufacturing process of the mesh surface of the filter screen is effectively simplified by the selective laser sintering technology; meanwhile, the integrally formed screen surface of the filter screen is of a double-layer lattice structure, compared with the screen surface manufactured by the traditional process, the screen surface deformation and screen surface damage risk can be effectively reduced, the screen surface and the pressing strip are integrated, and the screen surface falling can be effectively reduced. Through the design, the technical problems that the manufacturing process of the filter screen and the reinforcing net is complex, the net surface is deformed, the filter screen falls off from the base, the risk of damage to the net surface and the like in the prior art are solved, and the performance of the filter screen of the reactor core of the nuclear power plant is effectively improved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a core filter screen composite manufacturing method, and referring to fig. 2, the method comprises the following steps:
step S1, preparing a screen surface of the filter screen by a 3D printing technology;
step S2, preparing a base corresponding to the net surface of the filter screen;
step S3, assembling and welding the screen surface of the filter screen and the base; in one embodiment of the invention, according to the drawing requirements, two small holes are formed in the mesh surface of the filter screen, two small holes are also formed in the base, when the filter screen is assembled, the small holes in the mesh surface of the filter screen correspond to the small holes in the base, and in the assembling process, the concentricity of the paired small holes of the mesh surface of the filter screen and the base needs to be controlled to meet the design size requirement; it should be noted that: the pairing mode can be other modes, and is not limited herein;
further: in order to reduce stress and deformation brought by the welding process of the screen surface of the filter screen and the base, an I-shaped groove design mode is required in the assembly process of the filter screen and the base, the use of welding seam filling materials is reduced as much as possible, and further, the groove gap is 1-3mm, preferably 2 mm; in addition, the welding mode after the mesh surface of the filter screen and the base assembly is laser welding, the laser power, the laser moving speed, the laser spot diameter, the single-layer thickness and the protective atmosphere need to be strictly controlled in the welding process, in the preferred embodiment of the invention, the welding is carried out by adopting a Trumpf TruLaser 7040 laser coaxial powder feeding device, and the parameters in the welding process are as follows: during welding, the laser power is 600W, the laser moving speed is 500mm/min, the laser spot diameter is 2mm, the single-layer thickness is 0.6mm, the protective atmosphere is high-purity argon with the purity of more than 99.99 percent, the flow of the protective atmosphere is not 9L/min, and in the welding process, the scanning path planning is completed according to the appearance shape of the filter screen;
And step S4, carrying out surface inspection on the welded seam formed by welding to ensure that the welded seam meets the inspection standard. The welding after the assembly can adopt an intermittent welding or continuous welding mode, and the surface inspection standard of the welding seam is as follows: visual inspection is carried out on the surfaces of the welding seam and the adjacent parent metal areas (5mm) on two sides according to NB/T47013.7-2012 part 7 visual inspection of pressure-bearing equipment nondestructive testing, the surfaces are intact, and no cracks, holes or other harmful defects exist. And (3) carrying out liquid permeation inspection on the weld joint and the adjacent base metal areas (5mm) at two sides according to the requirements of NB/T47013.5-2015 part 5 liquid permeation of nondestructive testing of pressure-bearing equipment, and checking and accepting according to the inspection requirements of I-level weld joints.
Wherein, referring to fig. 3, step 1 comprises:
step S11, purchasing powder, performing powder inspection on the purchased powder, purchasing the powder again if the powder does not meet the requirement, and entering step S12 if the powder meets the requirement; by carrying out powder inspection on the purchased powder, the performance requirement of the net surface of the filter screen can be ensured, and when the prepared net surface of the filter screen has problems, the reasons of the purchased powder can be eliminated, so that the reasons of the problems are convenient to locate; wherein, the powder in the invention is stainless steel powder, the grade is any one of 304L, 304LN, 316L, 316LN, the purchased powder should meet the index requirements of D10, D50, D90, concretely: the particle size distribution of the purchased powder is 10-65um, wherein the index of D10 is 22-23um, the index of D50 is 36-38um, the index of D90 is 58-63um, the Hall flow rate of the powder is 13-15s/50g, the basic flow energy is 650-800mJ, and the pretreatment apparent density is 4.30-4.55 g/ml; preferably, 304L stainless steel powder is adopted in the invention, and the components of the 304L stainless steel powder meet the following requirements: the carbon (C) content is not higher than 0.03%, the silicon (Si) content is not higher than 1.00%, the manganese (Mn) content is not higher than 2.00%, the phosphorus (P) content is not higher than 0.045%, the sulfur (S) content is not higher than 0.03%, the chromium (Cr) content is 18.50% -20.00%, the copper (Cu) content is not higher than 1.00%, the nitrogen (N) content is not higher than 0.08%, the nickel (Ni) content is 9.00% -10.00%, and the cobalt (Co) content is not higher than 0.04%;
Step S12, setting 3D printing parameters, and printing the powder according to the 3D printing parameters to form a sample; taking 304L as an example, the 3D printing technology is a selective laser Sintering (SLM) technology, and the parameter ranges in the printing process are specifically: the laser power is 220-315W, the scanning speed is 900-1100mm/s, the scanning interval is 0.08-0.12mm, the layer thickness is 40 mu m, and the temperature of the substrate is not less than 100 ℃;
step S13, detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property do not meet the requirement, returning to the step S12 to reset the 3D printing parameters, and if the porosity and the mechanical property meet the requirement, entering the step S14; the set 3D printing parameters can be ensured to meet the performance requirements of the screen surface of the filter screen through the steps; wherein, the porosity of the sample needs to be controlled to be more than 99.99 percent, and the mechanical property test needs to meet the yield strength Rp0.2Not less than 205MPa, tensile strength RmNot less than 520MPa, elongation A after fracture not less than 40% of original 5d gauge length, shrinkage Z after fracture not less than 60%, impact energy KV when pendulum edge radius is 2mm2Not less than 60J, and not less than 200 Vickers hardness;
step S14, designing a printing scheme of the net surface of the filter net; the screen surface printing scheme of the filter screen is a double-layer dot matrix scheme;
step S15, printing and forming a screen surface of the filter screen and a furnace sample on the substrate according to the printing scheme; in order to verify the performance of the net surface of the filter screen, a furnace sample needs to be printed and molded while the net surface of the filter screen is printed and molded, the furnace sample is made of the same material and the same printing parameters as the integrated net surface, and the performance of the filter screen can be represented by the furnace sample;
Step S16, carrying out integral heat treatment on the substrate, the screen surface of the filter screen and the furnace sample; through integral heat treatment, the problem that the dimension does not meet the dimension acceptance requirement due to the deformation of a single filter screen and a sample can be avoided, and specifically, a 304L stainless steel material is taken as an example, the heat treatment process is recommended to be 1050 ℃, the temperature is kept for 30min, and nitrogen rapid cooling treatment is adopted;
step S17, cutting and separating the screen surface of the filter screen after heat treatment and a furnace sample from the substrate; and it is to be noted that: after cutting, machining treatment is carried out on the cutting surface of the filter screen, so that the requirements of drawing size and surface roughness are met;
step S18, post-processing the net surface of the filter screen and the furnace sample after cutting and separating; in order to reduce the flow resistance of the net surface, the whole sand blasting treatment is preferably adopted for the laser sintering net surface of the selected area, and during sand blasting, the uniformity of the sand blasting on the net surface of the filter net needs to be ensured, so that the surface roughness of the net surface of the filter net is ensured, and the flow resistance is improved;
step S19, performing mesh surface inspection on the post-processed furnace sample, and if the requirements are met, entering step S3; if not, the process returns to step S14. Specifically, the samples in the embodiments of the present invention include 1 component analysis sample of 10mm × 10mm × 10mm, the test method is GB/T223, 1 hardness test of 10mm × 10mm × 10mm, during the test, X, Y, Z surfaces of the samples need to be tested separately, the test method is GB/T4340.1-2009, room temperature tensile test samples of two in X, Y, Z directions, the sample size is 120 × Φ 20mm, the test method is GB/T228.1-2010, 55mm × 10mm × 10mm impact test samples of three in X, Y, Z directions, the test method is GB/T229-2007, the sample axes are parallel, the vertical printing direction is two intercrystalline corrosion test samples of 70mm × 10mm × 4mm, the test method is GB/T4334-2008, and 1 metallographic structure analysis of 20mm × 20mm (including porosity detection, and porosity detection), Inclusion inspection) needs to be performed on X, Y, Z surfaces one by one, the inspection method is GB/T10561-2005, in the basic coordinate direction, the X direction is parallel to the moving direction of the powder spreading scraper, the Y direction is perpendicular to the X direction on a horizontal plane, the Z direction is a deposition direction, and the following description is that: the intergranular corrosion test was carried out according to method E of GB/T4334. And all accessible surfaces should be visually inspected (VT) as NB/T47013.7-2012, and the surface should be intact and should not have cracks, holes or other harmful defects. And performing liquid Penetration Test (PT) on all accessible surfaces according to NB/T47013.5-2015 requirements, and checking and accepting according to I-level weld joint test requirements. Should carry out industrial computer tomography detection (CT) to the filter screen, must not have the maximum size more than 0.5mm hole. The surface defects found in the inspection should be removed by grinding, but the final dimensions of the product should be guaranteed to be within the tolerance. A liquid penetrant check is performed to ensure that the defects have been completely removed. The intergranular corrosion test of the furnace sample is to send out a crisp metal sound when the furnace sample is impacted, and no crack generated by intergranular corrosion is observed under a magnifying glass of 10 times after the furnace sample is bent. The metallographic structure analysis of the furnace sample is carried out so as to ensure that the microscopic metallographic phase has no crack and the pore defect is not more than 0.5 mm; the macroscopic metallographic examination should not have microcracks and precipitates which affect the material properties.
It should be noted that: for the process development stage, performing mesh surface inspection on the post-processed furnace sample, and if the mesh surface inspection is not satisfied, returning to the step S14; for the mass production phase, the phase design has been verified, returning to step S15.
Further, if the furnace sample is made of 304L stainless steel powder, the chemical components of the furnace sample meet the following requirements: the carbon (C) content is not higher than 0.03 percent, the silicon (Si) content is not higher than 1.00 percent, the manganese (Mn) content is not higher than 2.00 percent, the phosphorus (P) content is not higher than 0.045 percent, the sulfur (S) content is not higher than 0.03 percent, the chromium (Cr) content is 18.00 to 20.00 percent, the nickel (Ni) content is 8.00 to 12.00 percent, and the molybdenum (Mo) content is 0.75 to 1.025 percent; the mechanical property test should satisfy the yield strength Rp0.2Not less than 205MPa, tensile strength RmNot less than 520MPa, elongation A after fracture not less than 40% of original 5d gauge length, and shrinkage Z after fracture not less thanLess than 60 percent and the impact power KV when the radius of the pendulum edge is 2mm2Not less than 60J and not less than 200 Vickers hardness.
Further, as shown in fig. 4, the structure of the filtering screen and the reinforcing net of the present invention is designed as a double-layer lattice structure, unlike the traditional manufacturing process that adopts a double-layer independent screen surface design of the filtering screen and the reinforcing net. The filter screen adopts a fine-mesh surface dot matrix, and has the main function of filtering foreign matters and particles in a water filtering loop. The reinforcing net adopts thick wire side dot matrix, and the main function is the structural reinforcement, increases the structural strength of wire side, in addition, on thin wire side inefficacy basis, blocks that big foreign matter or granule get into reactor coolant system equipment, and the filterable second way protective screen of reactor core avoids causing equipment damage. In addition, the filter screen and the double-layer dot matrix design of reinforcement net, the integration is made, can ensure that filter screen and reinforcement net are whole to be out of shape in coordination, promotes the filter screen performance by a wide margin. Wherein, the grid of the filter screen is square holes with 2mm by 2mm, and the space between the grids is 2.9 mm; and a grid structure with the thickness of 2.5mm is added above the filter screen, and the distance between grids of the reinforcing net is 11.6 mm.
Further, as shown in fig. 5, step S2 includes:
step S21, purchasing blanks needed by the base; the base blank is purchased to meet the requirements of GB/T1220 and 2007 standard; the blank is a forged or cast part;
step S23, machining the blank to form a base;
step S24, the surface of the susceptor is inspected, and if the inspection does not satisfy the requirement, the process returns to step S21, and if the inspection satisfies the requirement, the process proceeds to step S3. All accessible surfaces should be visually inspected (VT) by NB/T47013.7-2012 before the group is assembled, the surfaces should be intact and there should be no cracks, holes or other harmful defects. All accessible surfaces should be subjected to liquid penetrant inspection (PT) according to NB/T47013.5-2015 requirements, and accepted according to class I inspection requirements. The surface defects found in the inspection should be removed by grinding, but the final dimensions of the product should be guaranteed to be within the tolerance. A liquid penetrant check is performed to ensure that the defects have been completely removed. Further ensuring that the performance of the manufactured base meets the requirements.
As shown in FIG. 6, the design of two press strips is different from the traditional manufacturing process, in the invention, the press strips are designed into an integral press strip, and the stability of the press strip performance is improved by the design of a whole circle of press strips and the integral printing and manufacturing of an integral net surface. The assembly problem among the layering, the filter screen and the reinforcing net is avoided, and the product yield is improved. And the filter screen and the reinforcing net are integrated net surfaces, a cushion block and a large head screw are omitted, the number of components and the assembly among the components are reduced, and the failure probability of the reactor core filter screen assembly is reduced.
It should be noted that: the invention also carries out identification test on the reactor core filter screen:
1) mechanical failure test
The reactor core filter screen is placed on a test bed of a pressure testing machine, the pressure head is ensured to be aligned with the reactor core filter screen, the reactor core filter screen is stably loaded (the moving speed of the pressure head is controlled to be between 0.5mm/min and 2.0mm/min at a constant speed) through the pressure head until the filter screen falls off from the base or the mesh wire is broken and fails, and the testing machine automatically stops. The failure mode and the maximum load before failure of the screen were recorded. And when the minimum value of the maximum load of the filter screen is not less than 20kN, the filter screen is qualified.
2) Hydraulic impact test
The reactor core filter screen is fixed, and the filter screen is continuously impacted by water flow (the water flow direction simulates the actual working condition) with the flow rate not lower than 15m/s-20m/s (a pipeline DN50) for 20 days. And (4) inspecting the filter screen after the test is finished, determining that the filter screen is qualified if no damage trace exists, and controlling the temperature of the test water to be normal temperature.
3) Foreign body impact simulation test
The reactor core filter screen is placed on the ground and supported and fixed by a tool, a rigid platform is arranged below the reactor core filter screen, and the filter screen is always in a suspended state in the test process. And (3) taking an M10 multiplied by 50 bolt, simulating that foreign matters freely fall at a position 4M above the reactor core filter screen, smashing and falling on the surface of the filter screen, repeating for 2 times, and inspecting the surface of the filter screen after the test is finished, wherein no obvious damage (broken wires and cracks) is considered to be qualified. The invention completes the design function verification of the filter screen component: the reactor core filter screen mechanical destruction test, the foreign matter impact simulation test and the hydraulic impact test can meet the use requirements. And compared with the traditional design for manufacturing the filter screen component, the mechanical failure test of the filter screen component improves the performance by 200 percent.
The embodiment of the invention provides a composite manufacturing method of a reactor core filter screen, which is characterized in that a 3D printing technology is utilized to integrally form the surface of the filter screen, a cushion block and a large-head screw are eliminated, the number of filter screen components and the assembly among the components are reduced, and the failure probability of a reactor core filter screen component is reduced; the manufacturing process of the screen surface of the filter screen is effectively simplified by the selective laser sintering technology; meanwhile, the integrally formed filter screen mesh is of a double-layer lattice structure, compared with the traditional process for manufacturing the mesh, the risk of deformation and damage of the mesh can be effectively reduced, the integral mesh and the pressing strip are integrally printed, the risk of falling of the mesh is effectively reduced, and the performance of the reactor core filter screen for the nuclear power plant is remarkably improved.
Example two
An embodiment of the present invention provides a core filter screen composite manufacturing system, and fig. 7 is a schematic diagram of functional modules in a second embodiment of the present invention, including:
a filter screen mesh surface preparation module 100 for preparing a filter screen mesh surface by a 3D printing technique;
a base preparation module 200 for preparing a base corresponding to the screen surface of the filter screen;
the assembly welding module 300 is connected with the filter screen surface preparation module 100 and the base preparation module 200 and is used for assembling and welding the filter screen surface and the base; in order to reduce stress and deformation brought by the welding process of the screen surface of the filter screen and the base, an I-shaped groove design mode is required in the assembly process of the filter screen and the base, the use of welding seam filling materials is reduced as much as possible, and further, the groove gap is 1-3mm, preferably 2 mm; in addition, the welding mode after the mesh surface of the filter screen and the base assembly is laser welding, the laser power, the laser moving speed, the laser spot diameter, the single-layer thickness and the protective atmosphere need to be strictly controlled in the welding process, in the preferred embodiment of the invention, the welding is carried out by adopting a Trumpf TruLaser 7040 laser coaxial powder feeding device, and the parameters in the welding process are as follows: during welding, the laser power is 600W, the laser moving speed is 500mm/min, the laser spot diameter is 2mm, the single-layer thickness is 0.6mm, the protective atmosphere is high-purity argon with the purity of more than 99.99 percent, the flow of the protective atmosphere is not 9L/min, and in the welding process, the scanning path planning is completed according to the appearance shape of the filter screen;
And the welding seam inspection module 400 is connected with the welding seam assembly welding module 300 and is used for carrying out surface inspection on the welding seam formed by welding and ensuring that the welding seam meets the inspection standard. The welding after the assembly can adopt an intermittent welding or continuous welding mode, and the surface inspection standard of the welding seam is as follows: visual inspection is carried out on the surfaces of the welding seam and the adjacent parent metal areas (5mm) on two sides according to NB/T47013.7-2012 part 7 visual inspection of pressure-bearing equipment nondestructive testing, the surfaces are intact, and no cracks, holes or other harmful defects exist. And (3) carrying out liquid permeation inspection on the weld joint and the adjacent base metal areas (5mm) at two sides according to the requirements of NB/T47013.5-2015 part 5 liquid permeation of nondestructive testing of pressure-bearing equipment, and checking and accepting according to the inspection requirements of I-level weld joints.
Further, with reference to fig. 8, the filter screen surface preparation module 100 includes:
the powder purchasing module 110 is used for purchasing powder and performing powder inspection on the purchased powder, if the powder does not meet the requirement, the powder is purchased again, and if the powder meets the requirement, the printing parameter setting module 120 is entered; by carrying out powder inspection on the purchased powder, the performance requirement of the net surface of the filter screen can be ensured, and when the net surface of the filter screen at the preparation position has problems, the reasons of the purchased powder can be eliminated, so that the reasons of the problems are convenient to locate; wherein, the powder in the invention is stainless steel powder, the grade is any one of 304L, 304LN, 316L, 316LN, the purchased powder should meet the index requirements of D10, D50, D90, concretely: the particle size distribution of the purchased powder is 10-65um, wherein the index of D10 is 22-23um, the index of D50 is 36-38um, the index of D90 is 58-63um, the Hall flow rate of the powder is 13-15s/50g, the basic flow energy is 650-800mJ, and the pretreatment apparent density is 4.30-4.55 g/ml; preferably, 304L stainless steel powder is adopted in the invention, and the components of the 304L stainless steel powder meet the following requirements: the carbon (C) content is not higher than 0.03%, the silicon (Si) content is not higher than 1.00%, the manganese (Mn) content is not higher than 2.00%, the phosphorus (P) content is not higher than 0.045%, the sulfur (S) content is not higher than 0.03%, the chromium (Cr) content is 18.50% -20.00%, the copper (Cu) content is not higher than 1.00%, the nitrogen (N) content is not higher than 0.08%, the nickel (Ni) content is 9.00% -10.00%, and the cobalt (Co) content is not higher than 0.04%;
The printing parameter setting module 120 is connected with the powder purchasing module 110 and is used for setting 3D printing parameters and printing the powder according to the 3D printing parameters to form a sample; the parameter range in the printing process is specifically as follows: the laser power is 220-315W, the scanning speed is 900-1100mm/s, the scanning interval is 0.08-0.12mm, the layer thickness is 40 mu m, and the temperature of the substrate is not less than 100 ℃;
the sample detection module 130 is connected with the printing parameter setting module 120 and is used for detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property do not meet the requirements, the sample detection module returns to the printing parameter setting module 120 to reset the 3D printing parameters, and if the porosity and the mechanical property meet the requirements, the sample detection module enters the printing scheme design module 140; the porosity of the sample needs to be controlled to be more than 99.99 percent, and the mechanical property test needs to meet the yield strength Rp0.2Not less than 205MPa, tensile strength RmNot less than 520MPa, elongation A after fracture not less than 40% of original 5d gauge length, shrinkage Z after fracture not less than 60%, impact energy KV when pendulum edge radius is 2mm2Not less than 60J, and not less than 200 Vickers hardness;
the printing scheme design module 140 is connected with the sample detection module 130 and is used for designing a printing scheme of the screen surface of the filter screen; the screen surface printing scheme of the filter screen is a double-layer dot matrix scheme; the filter screen adopts a fine mesh surface lattice, and has the main function of filtering foreign matters and particles in a water filtering loop. The reinforcing net adopts thick wire side dot matrix, and the main function is the structural reinforcement, increases the structural strength of wire side, in addition, on thin wire side inefficacy basis, blocks that big foreign matter or granule get into reactor coolant system equipment, and the filterable second way protective screen of reactor core avoids causing equipment damage. In addition, the filter screen and the double-layer dot matrix design of reinforcing net, the integration is made, can ensure that filter screen and reinforcing net are whole to be out of shape in coordination, promotes the filter screen performance by a wide margin. Wherein, the meshes of the filter screen are square holes with 2mm by 2mm, and the space between the meshes is 2.9 mm; and a grid structure with the thickness of 2.5mm is added above the filter screen, and the distance between grids of the reinforcing net is 11.6 mm.
The filter screen surface and furnace sample printing module 150 is connected with the printing scheme design module 140 and is used for printing and forming the filter screen surface and the furnace sample on the substrate according to the printing scheme; the furnace-associated sample is made of the same material and the same printing parameters as the integrated net surface, so that the performance of the filter screen can be represented by the furnace-associated sample;
the heat treatment module 160 is connected with the filter screen mesh surface and the furnace sample printing module 150 and is used for carrying out integral heat treatment on the substrate, the filter screen mesh surface and the furnace sample; taking a 304L stainless steel material as an example, the recommended heat treatment process is 1050 ℃, the temperature is kept for 30min, and nitrogen rapid cooling treatment is adopted;
the cutting module 170 is connected with the heat treatment module 160 and is used for cutting and separating the heat-treated mesh surface of the filter screen, the furnace sample and the substrate; after cutting, machining treatment is carried out on the cutting surface of the filter screen, so that the requirements of drawing size and surface roughness are met;
the post-processing module 180 is connected with the cutting module 170 and is used for post-processing the net surface of the filter screen and the furnace sample after cutting and separating; the whole sand blasting treatment is preferably adopted for the selective laser sintering mesh surface, and the uniformity of sand blasting on the mesh surface of the filter screen is required to be ensured during sand blasting so that the surface roughness of the mesh surface of the filter screen is consistent;
The filter screen surface inspection module 190 is connected with the post-processing module 180 and is used for inspecting the filter screen surface of the post-processed filter screen and a furnace sample, and if the requirements are met, the filter screen surface inspection module enters the assembly welding module 300; if not, return to the print scheme design module 140.
The press strip is designed into an integral press strip, and the stability of the press strip performance is improved through the design of a whole circle of press strip and integral printing and manufacturing of an integral net surface. The assembly problem among the layering, the filter screen and the reinforcing net is avoided, and the product yield is improved. And the filter screen and the reinforcing net are integrated net surfaces, a cushion block and a large head screw are omitted, the number of components and the assembly among the components are reduced, and the failure probability of the reactor core filter screen assembly is reduced.
Further, with reference to fig. 9, the base preparation module 200 includes:
a blank purchasing module 210 for purchasing blanks required by the base; the base blank is purchased to meet the requirements of GB/T1220-2007 standard; the blank is a forged or cast part;
a machining module 220 connected to the blank purchasing module 210 for machining the blank to form a base;
and the base inspection module 230 is connected with the machining module 220 and used for carrying out surface inspection on the base, returning to the blank purchasing module if the requirement is not met, and entering the assembly welding module 300 if the requirement is met.
It should be noted that: in the above embodiments, the manufacturing method is only illustrated by dividing the functional modules when the manufacturing system is implemented, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules, so as to complete all or part of the functions described above. In addition, the system and method embodiments provided by the above embodiments belong to the same concept, and the specific implementation process thereof is described in detail in the method embodiments, and is not described herein again.
In conclusion, the reactor core filter screen composite manufacturing method and system provided by the embodiment of the invention improve the molding efficiency of the reactor core filter screen, shorten the preparation period and save the manufacturing cost by molding through the 3D printing technology; the integrated structural design is adopted, so that the material consumption is reduced, the assembly problem among the layering, the filter screen and the reinforcing screen is avoided, and the product yield is improved; the reliability of the reactor core filter screen is improved by optimally designing the filter screen filtration; through 3D printing and forming, the structure strength is high, the filtering effect is good, and the risks of deformation and falling of the net surface and damage of the net surface are effectively reduced; the invention completes the design function verification of the filter screen component: the reactor core filter screen mechanical destruction test, the foreign matter impact simulation test and the hydraulic impact test can meet the use requirements. And compared with the traditional design for manufacturing the filter screen component, the mechanical failure test of the filter screen component improves the performance by 200 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (14)

1. The composite manufacturing method of the reactor core filter screen is characterized by comprising the following steps:
step S1, preparing a screen surface of the filter screen by a 3D printing technology;
step S2, preparing a base corresponding to the screen surface of the filter screen;
step S3, assembling and welding the screen surface of the filter screen and the base;
step S4, carrying out surface inspection on the welded seam formed by welding to ensure that the welded seam meets the inspection standard;
the net surface of the filter net is formed by integrally forming the filter net and a reinforcing net, the filter net and the reinforcing net are designed into a double-layer lattice structure, the filter net adopts a fine net surface lattice, and foreign matters and particles in a water filtering loop are filtered; the reinforcing net adopts a coarse net surface dot matrix, the structural strength of the net surface is increased, and large foreign matters or particles are prevented from entering reactor coolant system equipment on the basis of failure of a fine net surface to serve as a second barrier for filtering a reactor core, so that equipment damage is avoided; the filter screen and the reinforcing net are designed in a double-layer lattice mode and integrally manufactured, so that the integral cooperative deformation of the filter screen and the reinforcing net is ensured, and the net surface performance of the filter screen is improved; the layering design is whole layering, through whole circle layering design and the whole printing of integration wire side and manufacturing, improves layering stability of performance.
2. The core screen composite manufacturing method according to claim 1, wherein the step S1 includes:
step S11, purchasing powder, performing powder inspection on the purchased powder, purchasing the powder again if the powder does not meet the requirement, and entering step S12 if the powder meets the requirement;
step S12, setting 3D printing parameters, and printing the powder according to the 3D printing parameters to form a sample;
step S13, detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property do not meet the requirement, returning to the step S12 to reset the 3D printing parameters, and if the porosity and the mechanical property meet the requirement, entering the step S14;
step S14, designing a printing scheme of the net surface of the filter net;
step S15, printing and forming a screen surface of the filter screen and a furnace sample on the substrate according to the printing scheme;
step S16, carrying out integral heat treatment on the substrate, the net surface of the filter screen and the furnace sample;
step S17, cutting and separating the heat-treated mesh surface of the filter screen, the furnace sample and the substrate;
step S18, post-processing the net surface of the filter net after cutting and separating;
step S19, carrying out filter screen surface inspection on the post-processed filter screen surface and the furnace sample, and if the requirements are met, entering step S3; if not, the process returns to step S14.
3. The core screen composite manufacturing method according to claim 2, wherein the step S2 includes:
step S21, purchasing blanks required by the base;
step S22, machining the blank to form a base;
and step S23, carrying out surface inspection on the base, returning to the step S21 if the requirement is not met, and entering the step S3 if the requirement is met.
4. The core screen composite manufacturing method according to claim 3, wherein the 3D printing technology is a selective laser sintering technology.
5. The core screen composite manufacturing method according to claim 4, wherein the screen surface inspection in the step S19 comprises an industrial computer tomography inspection, a liquid penetration inspection, and a visual inspection.
6. The core screen composite manufacturing method of claim 5, wherein the post-treatment in the step S18 is sand blasting treatment for ensuring the surface roughness of the screen surface of the filter screen and improving the flow resistance.
7. The core screen composite manufacturing method of claim 6, wherein the blank in the step S21 is a forged or cast piece.
8. A core screen composite manufacturing system, comprising:
The filter screen surface preparation module is used for preparing a filter screen surface by a 3D printing technology;
the base preparation module is used for preparing a base corresponding to the net surface of the filter screen;
the assembly welding module is connected with the filter screen surface preparation module and the base preparation module and is used for assembling and welding the filter screen surface and the base;
the welding seam inspection module is connected with the assembly welding module and used for carrying out surface inspection on a welding seam formed by welding and ensuring that the welding seam meets an inspection standard;
the printing scheme of the net surface of the filter screen is a double-layer dot matrix scheme, the net surface of the filter screen is formed by integrally forming the filter screen and a reinforcing net, the filter screen adopts a fine net surface dot matrix, and foreign matters and particles in a water filtering loop are filtered; the reinforcing net adopts a coarse net surface dot matrix, the structural strength of the net surface is increased, and large foreign matters or particles are prevented from entering reactor coolant system equipment on the basis of failure of a fine net surface to serve as a second barrier for filtering a reactor core, so that equipment damage is avoided; the filter screen and the reinforcing net are designed in a double-layer lattice mode and integrally manufactured, so that the integral cooperative deformation of the filter screen and the reinforcing net is ensured, and the net surface performance of the filter screen is improved; the layering design is whole layering, through whole circle layering design and the whole printing of integration wire side and manufacturing, improves layering stability of performance.
9. The core screen composite manufacturing system of claim 8, wherein the filter screen mesh surface preparation module comprises:
the powder purchasing module is used for purchasing powder and carrying out powder inspection on the purchased powder, if the powder does not meet the requirement, the powder is purchased again, and if the powder meets the requirement, the powder enters the printing parameter setting module;
the printing parameter setting module is connected with the powder purchasing module and used for setting 3D printing parameters and printing the powder according to the 3D printing parameters to form a sample;
the sample detection module is connected with the printing parameter setting module and is used for detecting the porosity and the mechanical property of the sample, if the porosity and the mechanical property of the sample do not meet the requirements, the sample detection module returns to the printing parameter setting module to reset the 3D printing parameters, and if the porosity and the mechanical property of the sample do not meet the requirements, the sample detection module enters the printing scheme design module;
the printing scheme design module is connected with the sample detection module and is used for designing a printing scheme of the net surface of the filter screen;
the printing module for the screen surface of the filter screen and the furnace sample is connected with the printing scheme design module and is used for printing and forming the screen surface of the filter screen and the furnace sample on the substrate according to the printing scheme;
the heat treatment module is connected with the filter screen mesh surface and the furnace sample printing module and is used for carrying out integral heat treatment on the substrate, the filter screen mesh surface and the furnace sample;
The cutting module is connected with the heat treatment module and is used for cutting and separating the heat-treated mesh surface of the filter screen, the furnace sample and the substrate;
the post-processing module is connected with the cutting module and is used for post-processing the net surface of the filter screen after cutting and separating;
the filter screen surface inspection module is connected with the post-processing module and is used for inspecting the post-processed filter screen surface and a furnace sample, and if the requirements are met, the filter screen surface inspection module enters the assembly welding module; if not, returning to the printing scheme design module.
10. The core screen composite manufacturing system of claim 9, wherein the base preparation module comprises:
the blank purchasing module is used for purchasing blanks required by the base;
the machining module is connected with the blank purchasing module and used for machining the blank to form a base;
and the base inspection module is connected with the machining module and used for inspecting the surface of the base, returning to the blank purchasing module if the requirement is not met, and entering the assembly welding module if the requirement is met.
11. The core screen composite manufacturing system of claim 10, wherein the 3D printing technique is a selective laser sintering technique.
12. The core screen composite manufacturing system according to claim 11, wherein the screen surface inspection of the screen surface inspection module comprises an industrial computer tomography inspection, a liquid penetration inspection, a visual inspection.
13. The core screen composite manufacturing system of claim 12, wherein the post-treatment in the post-treatment module is sand blasting treatment for ensuring the surface roughness of the screen surface of the filter screen and improving the flow resistance.
14. The core screen composite manufacturing system of claim 13, wherein the billet in the billet procurement module is a forged or cast piece.
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