CN104751921A - Claw assembly with long service life and production process thereof - Google Patents
Claw assembly with long service life and production process thereof Download PDFInfo
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- CN104751921A CN104751921A CN201510128539.XA CN201510128539A CN104751921A CN 104751921 A CN104751921 A CN 104751921A CN 201510128539 A CN201510128539 A CN 201510128539A CN 104751921 A CN104751921 A CN 104751921A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/18—Manufacture of control elements covered by group G21C7/00
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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
- G21C7/12—Means for moving control elements to desired position
- G21C7/14—Mechanical drive arrangements
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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
Abstract
The invention discloses a claw assembly with long service life and a production process thereof, which are used for manufacturing parts with mutual friction in an operation process of the claw assembly of a nuclear reactor control rod driving mechanism. The process comprises the following steps which are carried out in sequence: discharging, roughly machining and machining a wear-resisting layer on the surface. The step of discharging is to machine blanks of all parts according to design requirements; the step of machining the wear-resisting layer on the surface is to spray and weld the wear-resisting layer on the surface of each blank; and the step of spraying and welding the wear-resisting layer comprises the following steps which are carried out in sequence: pre-heating, spraying powder and re-melting, and cooling. In the claw assembly disclosed by the invention, the sprayed and welded wear-resisting layer or the surfaced wear-resisting layer is arranged on the surface of each part with the friction in the operation process. The invention provides the claw assembly with the long service life and a corresponding manufacturing process, and the obtained claw assembly meets the requirements on the wear resistance under a high-frequency working condition within a 60-year service period.
Description
Technical field
The present invention relates to reactor control system assembly and assembly manufacture field, particularly relate to a kind of long-life hook assembly and manufacturing process thereof.
Background technology
Presurized water reactor control rod drive mechanisms (CRD) is arranged on top cover of reactor pressure vessel, it can drive C&P systems to move up and down or quick insertion reactor core at heap in-core according to instruction, completes the startup of reactor, regulating power, maintenance power, the normal function such as shutdown and breakdown.Meanwhile, the hook assembly of control rod drive mechanisms (CRD) has been the action executing parts of above-mentioned instruction, is the easily worn part of control rod drive mechanisms (CRD).
At present in-service in the world two generations (containing two generation modified) control rod drive mechanisms (CRD) of pressurized-water reactor nuclear power plant many employings L-106A type and derivative version (hereinafter referred to as A type) thereof, the three generations's pressurized-water reactor nuclear power plant built is the control rod drive mechanisms (CRD) adopting L-106B type and derivative version (hereinafter referred to as Type B) thereof then more.The serviceable life of A type control rod drive mechanisms (CRD) consumable accessory requires to be 2,800,000 steps, and the serviceable life of Type B control rod drive mechanisms (CRD) consumable accessory requires to be 6,000,000 steps.Present stage, nuclear power station was all as base load power station, namely reactor is oepration at full load, without the need to carrying out peak regulation according to power load, so the run action of control rod drive mechanisms (CRD) infrequently, the requirement in serviceable life under not peak regulation operating mode therefore all can only be met the designed life of above-mentioned A type and Type B control rod drive mechanisms (CRD).
Along with nuclear power is powered improving constantly of ratio, nuclear power peak regulation progressively becomes actual needs.According to nuclear power peak regulation, then control rod drive mechanisms (CRD) needs constantly to run to regulate reactor capability on reactor, like this for 60 years designed lives of hook assembly, just need significantly to rise to more than 2,000 ten thousand steps, and current two generations running and serviceable life of three generations's presurized water reactor control rod drive mechanisms (CRD) hook assembly all can not meet this requirement.Therefore, design a kind of long-life hook assembly and there is Practical Project value.
Summary of the invention
60 years designed lives for above-mentioned hook assembly are example, just need significantly to rise to more than 2,000 ten thousand steps, and current in two generations of operation and the problem that all can not meet this requirement serviceable life of three generations's presurized water reactor control rod drive mechanisms (CRD) hook assembly, the invention provides a kind of long-life hook assembly and manufacturing process thereof.
For solving the problem, a kind of long-life hook assembly provided by the invention and manufacturing process thereof solve problem by following technical essential: a kind of long-life hook assembly and manufacturing process thereof, the manufacture of the part of friction is there is each other in the hook assembly for command bundle rods for nuclear reactors driving mechanism in operational process, comprise blanking that order carries out, roughing and surface working wearing layer step, described blanking step is the blank processing each part according to designing requirement;
Described surface working wearing layer step is at the surperficial oxyacetylene welding of each blank or build-up wear-resistant layer, and wherein, surfacing wearing layer comprises the following steps that order is carried out:
A, preheating, described preheating is for be heated to 300-400 DEG C by each blank;
B, dust and remelting, described dusting adopts oxygen acetylene flame to carry out, described dusting comprises number of times and is at least once and the equal solder powder jeting process of number of times and heat-welding process, described solder powder jeting process and heat-welding process interval are carried out, described solder powder sprays for the wearing layer solder powder of to be painted surperficial jet thickness within the scope of 0.2-0.3mm at blank or overlay, described hot melt is for heat above-mentioned solder powder by oxygen acetylene flame, make it to form overlay, described oxygen acetylene flame adopts neutral flame, weak carburizing flame or carburizing flame, the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2,
Described remelting is that one or more layers overlay adopting thermal source to obtain dusting heats, until overlay is molten condition again;
C, cooling, described in be cooled to blank step B obtained and cool, it is cold or after blank surface arranges heat-insulation layer, make it nature cooling that described cooling comprises stove.
Simultaneously, present invention also offers a kind of long-life hook assembly, comprise quill, hook supporting sleeve, buffer shaft, hook bearing support, mobile armature, hook and connecting rod, in the outside wall surface of described quill, on the mating surface of hook supporting sleeve and hook bearing support, on the mating surface of buffer shaft and quill, on the mating surface of buffer shaft and mobile armature, on hook hinge hole internal face and the flank of tooth, the hinge hole internal face of connecting rod is provided with surfacing wearing layer or build-up wear-resistant layer.
Further technical scheme is:
The thermal source that described reflow step adopts is oxygen acetylene flame, and the oxygen acetylene flame that reflow step adopts is neutral flame, weak carburizing flame or carburizing flame, and the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2.
In reflow step, the clip surface angular region of the oxygen acetylene flame that reflow step adopts and overlay is between 60 ° ~ 75 °.
If dust, number of times is for repeatedly, and described remelting is carried out several times, has namely dusted all to carry out a remelting afterwards at every turn again.
Also comprise slagging-off operation after each remelting completes, described slagging-off operation is coating fusion when being cooled to 670 DEG C of-715 DEG C of scopes, removes the slag that overlay surface is separated out.
Described solder powder is Co-based alloy powder or Co-based alloy powder.
The thickness of described surfacing wearing layer is all between 0.1-3mm.
More than one of tooth bar on described hook.
The face width of tooth of described tooth bar is between 2.2mm ~ 5.35mm.
The present invention has following beneficial effect:
The invention provides a kind of long-life hook modular construction i.e. manufacturing process of this structure, adopt the mode of oxyacetylene welding or oxygen-acetylene repairing in this process route, in this process route, mother metal fusing seldom, and the dilution rate ground of surface-welding layer, does not even dilute; The solder powder that oxygen-acetylene surfacing uses is alloy powder, described alloy powder has self-melting alloy, alloy powder is in surfacing fusion process, its composition can reduce the oxide film of self and base material, the borosilicate slag forming low melting point covers layer surface, prevent the oxidation of alloy and improve wetting state, make alloy and base material can obtain good metallurgical binding, bond strength generally can be greater than 350-700MPa.
Like this, this process route is with in employing structure provided by the invention:
The adhesion of oxyacetylene welding wearing layer is better, is not easy generation and comes off, hot spray-welding dense structure, and metallurgical imperfection is little, high with base material bond strength;
Surfacing speed is high, and successfully can carry out the surfacing of refractory material, and the alloy choice of surface spraying layer is large;
Spray-welding coating composition, even tissue, spray-welding coating flat smooth, size can obtain more accurately controlling, and can obtain thicker spray-welding coating;
The ability of bearing load is good, and spray-welding coating but can bear larger impulsive force, extrusion stress or contact stress etc.
Like this, above technical pattern and realize technique not only can realize quick wearing layer arrange, the part that also can make meets the even higher requirement in serviceable life of control rod drive mechanisms (CRD) 2,000 ten thousand step.
Accompanying drawing explanation
Fig. 1 is the process chart of a manufacturing process specific embodiment of a kind of long-life hook assembly of the present invention;
Fig. 2 is in embodiment 1, uses wimet solder powder surfacing, the weld contour schematic diagram that different flame ratios is formed;
Fig. 3 be adopt in embodiment 1 carbon content be 1.13% solder powder carry out surfacing, adopt the deposit metal carbon content contrast table that different flame ratio obtains;
Fig. 4 is the structural representation of a kind of long-life hook assembly of the present invention specific embodiment;
Fig. 5 is in a kind of long-life hook assembly of the present invention specific embodiment, the structural representation of hook.
Mark wherein in figure is respectively: 1, quill, and 2, hook supporting sleeve, 3, buffer shaft, 4, hook bearing support, 5, mobile top gem of a girdle-pendant iron, 6, hook, 7, connecting rod.
Embodiment
The invention provides a kind of long-life hook assembly and manufacturing process thereof, for solving: along with nuclear power is powered improving constantly of ratio, nuclear power peak regulation progressively becomes actual needs.According to nuclear power peak regulation, then control rod drive mechanisms (CRD) needs constantly to run to regulate reactor capability on reactor, like this for 60 years designed lives of hook assembly, just need significantly to rise to more than 2,000 ten thousand steps, and current in two generations of operation and the problem that all can not meet this requirement serviceable life of three generations's presurized water reactor control rod drive mechanisms (CRD) hook assembly.The realization of above technique effect depends on has the method for surfacing wearing layer on the part of frictionally damage to be realized each other in hook assembly operating process, and the realization of above goal of the invention is based on the part of a kind of long-life hook assembly manufacturing process or particular surface form.Below in conjunction with embodiment, the present invention is described in further detail, but the present invention is not limited only to following examples:
Embodiment 1:
As shown in Figures 1 to 4, a kind of manufacturing process of long-life hook assembly, the manufacture of the part of friction is there is each other in the hook assembly for command bundle rods for nuclear reactors driving mechanism in operational process, comprise blanking that order carries out, roughing and surface working wearing layer step, described blanking step is the blank processing each part according to designing requirement;
Described surface working wearing layer step is the surface spraying weld wearing layer at each blank, and wherein, surfacing wearing layer comprises the following steps that order is carried out:
A, preheating, described preheating is for be heated to 300-400 DEG C by each blank;
B, dust and remelting, described dusting adopts oxygen acetylene flame to carry out, described dusting comprises number of times and is at least once and the equal solder powder jeting process of number of times and heat-welding process, described solder powder jeting process and heat-welding process interval are carried out, described solder powder sprays for the wearing layer solder powder of to be painted surperficial jet thickness within the scope of 0.2-0.3mm at blank or overlay, described hot melt is for heat above-mentioned solder powder by oxygen acetylene flame, make it to form overlay, described oxygen acetylene flame adopts neutral flame, weak carburizing flame or carburizing flame, the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2,
Described remelting is that one or more layers overlay adopting thermal source to obtain dusting heats, until overlay is molten condition again;
C, cooling, described in be cooled to blank step B obtained and cool, it is cold or after blank surface arranges heat-insulation layer, make it nature cooling that described cooling comprises stove.
Simultaneously, present invention also offers a kind of long-life hook assembly, comprise quill 1, hook supporting sleeve 2, buffer shaft 3, hook bearing support 4, mobile armature 5, hook 6 and connecting rod 7, in the outside wall surface of described quill 1, hook supporting sleeve 2 with on the mating surface of hook bearing support 4, buffer shaft 3 with on the mating surface of quill 1, buffer shaft 3 is with on the mating surface of mobile armature 5, on hook 6 hinge hole internal face and the flank of tooth, the hinge hole internal face of connecting rod 7 is provided with surfacing wearing layer or build-up wear-resistant layer.
Concrete, the part that the hook assembly of command bundle rods for nuclear reactors driving mechanism exists friction each other in operational process comprises quill 1, hook supporting sleeve 2, buffer shaft 3, hook bearing support 4, mobile armature 5, hook 6, connecting rod 7 and driving stem, in above part, driving stem is final action output element, its action output action is in the control rod of nuclear reaction, and other parts are the part for transmitting motion and power.
In prior art, hook 6 and driving stem are engaged by buffering between the two and perform an action, and the tooth bar of hook 6 and hinge hole increase hardness by built-up welding Co-base alloy material or the overall Co-base alloy material that uses, and improve wearing quality; In the parts such as quill 1, hook supporting sleeve 2, buffer shaft 3, hook bearing support 4, generally wearing layer is set by the form of chrome-faced or cobalt-base alloys built-up welding in abrading section.Electrodeposited chromium technique wearing layer thickness is even, electroplating technology is easy to realize and efficiency is high, but in operational process, all there is larger friction and impact, the adhesion that electrodeposited coating needs due to electroplated component, but chromium coating is blocked up, easily peel off, and coating is thin and hardness is not very high is more worn out.Therefore, in each part of driving mechanism hook assembly, chromium coating thickness is generally 0.035mm(hinge hole inside surface) or other inside and outside surfaces of 0.07mm(), which limits the request for utilization that can not reach 2,000 ten thousand steps serviceable life of hook assembly electroplated component.Found in driving mechanism durability test, namely just there is the phenomenon that local is worn out in operation 6,000,000 step in electroplated component, namely occur the worn out of larger area about running to 1,100 ten thousand steps in the past.Once chromium coating worn out after, the friction of motion between part can significantly increase, and accelerates the wearing and tearing of part mother metal, hook assembly and rapid failure.Adopt the method for build-up wear-resistant layer can obtain thicker and good with the base material aggregation strength wearing layer of thickness, but the realization of build-up wear-resistant layer affects larger by accessory size factor and operating space size, the equal wearing layer that can apply to the position such as outside surface, shallow bore hole of part is arranged, the efficiency of built-up welding is simultaneously low, larger to the performance impact of mother metal.
Based on above existing hook Module Manufacture Technology, the present invention proposes to adopt the mode of surfacing to arrange wearing layer, the object of described preheating step is for removing surface of the work moisture, and produce certain thermal expansion minimizing temperature difference, thus minimizing thermal stress is conducive to improving anchoring strength of coating, ensures spray-welding coating quality; Described dusting adopts QH-2/H or QH-4/H type spray gun in the present embodiment, above welding gun is with powder tank, like this, solder powder is taken out of welding gun with gas, in flame, melted by heating sprays into surface of the work or the surface of overlay formerly, described remelting be the layer that dusts of solder powder is heated to solder powder solid liquid phase between temperature range, make original sprayed coating that is comparatively loose, porous become fine and close spray-welding coating, make between solder powder layer and mother metal, to reach metallurgical binding completely; In the further restriction of described cooling step, Part temperature Slow cooling can be allowed, reduce the distortion of part and shrink internal stress.
In the present embodiment, the flame core of oxygen acetylene flame and the length ratio of internal flame are limited between 1:1 to 1:2, actually be limit oxygen, acetylene as the blending ratio of both burning gases, namely adopt the flame core of oxygen acetylene flame of 1:1 to 1:2 and the length ratio of internal flame can be limited between 0.32-1.2 by the blending ratio of oxygen, acetylene two kinds of gases, obtain the several types that oxygen acetylene flame is neutral flame, weak carburizing flame or carburizing flame.Under these process conditions, above-mentioned oxygen acetylene flame can be avoided to be oxidizing flame, cause molten bath or heated metal is oxidized, above-mentioned oxygen acetylene flame can be avoided to be strong carburizing flame, cause the carburizing amount of deposit metal excessive, affect the toughness of the wearing layer obtained.
Above-mentioned oxygen acetylene flame is the three types kind of neutral flame, weak carburizing flame or carburizing flame, and for flame ratio during neutral flame is 1:1, under these process conditions, deposit metal a small amount of carbon loss occurs or is less than the carburizing of 0.04%; Under weak carburizing flame and carburizing flame, in welding process, acetylene can not burn completely, superfluous acetylene decomposition is hydrogen and uncombined carbon, free carbon can be seeped in molten bath under the effect of high temperature, the carbon content of weld seam increases, form solid molten strengthening, so weld hardness also improves accordingly thereupon, wearing quality improves.Employing is greater than 1:1 and is less than or equal to the flame of 1:2 to control the amount of unburnt acetylene, thus controls the carburizing amount of weld(ing) deposit, the effective much higher hard controlling weld seam.Under weak carburizing flame, flame ratio is between 1:1 to 1:1.5, and the carburizing of 0.02 ~ 0.11% occurs under these process conditions; Under carburizing flame, flame ratio is between 1:5 to 1:2, and the carburizing of 0.11 ~ 0.21% occurs under these process conditions.When particularly adopting carburizing flame and weak carburizing flame, in the structure of deposit metal, carbonide slabbing and net distribution, be evenly distributed, and is convenient to make part obtain uniform wearing quality.Simultaneously when adopting carburizing flame and weak carburizing flame, owing to having carburizing and reducing action, during welding, the surface of welding surface weld seam together with upper of energy " soaking " test specimen, improves the mobility of deposit metal, reduce the surface tension of liquid metal, contribute to the shaping and quality controlling weld seam.Wimet solder powder surfacing is used in the present embodiment, " soaking " effect of different flame ratios has obvious difference, the weld shape formed as shown in Figure 2, wherein, adopt carburizing flame and weld shape corresponding to weak carburizing flame as shown in a in Fig. 2, adopt weld shape corresponding to neutral flame as shown in b in Fig. 2, adopt weld shape that oxidizing flame is corresponding as shown in c in Fig. 2.In Fig. 2, weld seam surface tension when welding of a, b shape is little, particularly a, and liquid metal flows is high, and shaping surface is good; In Fig. 2, the weld seam of c shape surface tension when welding is large, and appearance of weld is bad, and when weld seam and mother metal fuse, angle is little, easily forms the weld defects such as slag inclusion, pore.
The present embodiment provides the solder powder of 1.13% of employing carbon content, and the deposit metal carbon content contrast table adopting different flame ratio to obtain as shown in Figure 3.
In the present embodiment, dusting to adopt is clamped on revolving shaft by part, the mode realizing moving axially Burners Positions in the process that part rotates completes dusting operation fast, the wearing layer thickness of the number of times simultaneously dusted depending on arranging, also will consider remelting in process route after, overlay shrinks the pre-allowance of the thickness that dusts of about 25%.
In reflow step, the present embodiment employing flame and surperficial angle are 60 ° ~ 75 °, from being about 30mm place apart from coating, suitably grasp remelt speed, coating are heated, until coating occurs that " minute surface " is reflective for spending, then carry out the remelting at next position.Should prevent superfusion (" minute surface " ftractures) during remelting, coating metal trickles, or spot heating overlong time makes surface oxidation.
Adopt the mode of surfacing in the present embodiment, in this process route, mother metal fusing seldom, and the dilution rate ground of surface-welding layer, does not even dilute; The solder powder that oxygen-acetylene surfacing uses is alloy powder, described alloy powder has self-melting alloy, alloy powder is in surfacing fusion process, its composition can reduce the oxide film of self and base material, the borosilicate slag forming low melting point covers layer surface, prevent the oxidation of alloy and improve wetting state, make alloy and base material can obtain good metallurgical binding, bond strength generally can be greater than 350-700MPa.
Compared with traditional chromium-plated part coating, its advantage is more obvious:
The adhesion of surfacing wearing layer is better, is not easy generation and comes off, hot spray-welding dense structure, and metallurgical imperfection is little, high with base material bond strength;
Production efficiency is high, and surfacing speed is high, and successfully can carry out the surfacing of refractory material, and the alloy choice of surface spraying layer is large;
Spray-welding coating composition, even tissue, spray-welding coating flat smooth, size can obtain more accurately controlling, and can obtain thicker spray-welding coating;
The ability of bearing load is good, and spray-welding coating but can bear larger impulsive force, extrusion stress or contact stress etc.
Above technique effect not only can realize quick wearing layer and arrange, and the part that also can make meets the even higher requirement in serviceable life of control rod drive mechanisms (CRD) 2,000 ten thousand step.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figures 1 to 5, as the further implementation of embodiment 1, the thermal source that described reflow step adopts is oxygen acetylene flame, and the oxygen acetylene flame that reflow step adopts is neutral flame, weak carburizing flame or carburizing flame, the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2.Between 1:1 to 1:2, limiting reason with embodiment 1 to the flame core of oxygen acetylene flame and the length ratio of internal flame in the present embodiment, is limit oxygen, acetylene as the blending ratio of both burning gases actually.
In reflow step, the clip surface angular region of the oxygen acetylene flame that reflow step adopts and overlay is between 60 ° ~ 75 °.The two step method adopted in step B in surfacing wearing layer process is carried out, and the first step is dusted, and second step is remelting again.Dusting is be sprayed on surface of the work after being melted by alloy powder, and in this step, the fusing of alloy powder is incomplete, and surface exists some unfused powder and some oxides, these powder and oxide adhesion not strong.In reflow step, welding gun becomes 60 ° ~ 75 ° angles with workpiece, namely the clip surface angular region of oxygen acetylene flame and overlay is between 60 ° ~ 75 °, be the blowing force in order to be formed by flame by this one deck powder and the oxide removal on surface, thus obtain the better and each layer of compactness and combine wearing layer structure more closely.
For obtaining the better wearing layer of compactness, if the number of times that dusts is for repeatedly, described remelting is carried out several times, has namely dusted all to carry out a remelting afterwards at every turn again.
Combining wearing layer structure more closely for obtaining the better and each layer of compactness, also comprising slagging-off operation after each remelting completes, described slagging-off operation is coating fusion when being cooled to 670 DEG C of-715 DEG C of scopes, removes the slag that overlay surface is separated out.
As being applicable to surfacing and the Alloy soldering powder of anti-wear performance excellence, solder powder described in the present embodiment is Co-based alloy powder or Co-based alloy powder.Quill 1, hook supporting sleeve 2, buffer shaft 3, hook bearing support 4, mobile top gem of a girdle-pendant iron 5, hook 6 and connecting rod 7 adopt ultra-low carbon austenitic stainless steel (as 00Cr18Ni10N etc.) or martensitic stain less steel (as 1Cr13) as matrix mother metal.
As meeting designed life and wearing layer thickness incrust under shock stress, the thickness of described surfacing wearing layer is all between 0.1-3mm.The thickness range selection that above thickness is wider, the surge pressure intensity based on mating surface between different part is different with wearing and tearing severe degree.
In hook assembly operating process, because of mating surface wearing and tearing, the matching relationship of driving stem and hook 6 the most easily occurs that cooperation was lost efficacy, for reducing the stress intensity between driving stem and hook 6 on engagement process middle rack, be beneficial to the serviceable life reducing wearing and tearing severe degree, improve driving stem and hook 6 upper rack, in the present embodiment, be set to more than one of tooth bar on hook 6.
In prior art, hook 6 addendum flank width is generally 1.75mm to the maximum, and above face width of tooth is as shown in the L marked in Fig. 5.But find from the mesh degree of hook 6 and driving stem annular groove, hook 6 upper rack and driving stem annular groove gap engagement time larger, when other size constancies, hook 6 top face width of tooth is amplified to 2.2mm ~ 5.35mm, so just can both ensure not affect engagement action when control rod drive mechanisms (CRD) is run between hook 6 upper rack and driving stem annular groove, effectively improve again more than life-span to 2,000 ten thousand step of hook 6, therefore in the present embodiment, the face width of tooth of described tooth bar 6 is between 2.2mm ~ 5.35mm.
Embodiment 3:
The present embodiment is further qualified on the basis of embodiment 1, and as shown in Figure 1, the present embodiment provides a kind of preferred hook assembly manufacturing process route, before blanking, carry out condition precedent detection; Clean, markers step is comprised between roughing and surface working wearing layer step; Carry out before preheating step welding front Non-Destructive Testing, cooling step is insulation cooling, and cooling step is follow-up also comprises the Non-Destructive Testing after postwelding Non-Destructive Testing that order carries out, machine work, machine work, finish size inspection, the clean mark of part, warehouse-in.
Above content is the further description done the present invention in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments drawn under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (10)
1. the manufacturing process of a long-life hook assembly, the manufacture of the part of friction is there is each other in the hook assembly for command bundle rods for nuclear reactors driving mechanism in operational process, comprise blanking that order carries out, roughing and surface working wearing layer step, described blanking step is the blank processing each part according to designing requirement;
It is characterized in that, described surface working wearing layer step is at the surperficial oxyacetylene welding of each blank or oxygen-acetylene repairing wearing layer, and wherein, oxyacetylene welding wearing layer comprises the following steps that order is carried out:
Preheating, described preheating is for be heated to 300-400 DEG C by each blank;
Dust and remelting, described dusting adopts oxygen acetylene flame to carry out, described dusting comprises number of times and is at least once and the equal solder powder jeting process of number of times and heat-welding process, described solder powder jeting process and heat-welding process interval are carried out, described solder powder sprays for the wearing layer solder powder of to be painted surperficial jet thickness within the scope of 0.2-0.3mm at blank or overlay, described hot melt is for heat above-mentioned solder powder by oxygen acetylene flame, make it to form overlay, described oxygen acetylene flame adopts neutral flame, weak carburizing flame or carburizing flame, the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2,
Described remelting is that one or more layers overlay adopting thermal source to obtain dusting heats, until overlay is molten condition again;
Cooling, described in be cooled to blank step B obtained and cool, it is cold or after blank surface arranges heat-insulation layer, make it nature cooling that described cooling comprises stove.
2. the manufacturing process of a kind of long-life hook assembly according to claim 1, it is characterized in that, the thermal source that described reflow step adopts is oxygen acetylene flame, and the oxygen acetylene flame that reflow step adopts is neutral flame, weak carburizing flame or carburizing flame, the flame core of described oxygen acetylene flame and the length ratio of internal flame are between 1:1 to 1:2.
3. the manufacturing process of a kind of long-life hook assembly according to claim 2, is characterized in that, in reflow step, the clip surface angular region of the oxygen acetylene flame that reflow step adopts and overlay is between 60 ° ~ 75 °.
4. the manufacturing process of a kind of long-life hook assembly according to claim 1, is characterized in that, if the number of times that dusts is for repeatedly, described remelting is carried out several times, has namely dusted all to carry out a remelting afterwards at every turn again.
5. a kind of long-life hook assembly according to claim 4 and manufacturing process thereof, it is characterized in that, also comprise slagging-off operation after each remelting completes, described slagging-off operation is coating fusion when being cooled to 670 DEG C of-715 DEG C of scopes, removes the slag that overlay surface is separated out.
6., according to the manufacturing process of a kind of long-life hook assembly in claim 1 to 5 described in any one, it is characterized in that, described solder is Co-based alloy powder or Co-based alloy powder.
7. a long-life hook assembly, comprise quill (1), hook supporting sleeve (2), buffer shaft (3), hook bearing support (4), mobile armature (5), hook (6) and connecting rod (7), it is characterized in that, in the outside wall surface of described quill (1), hook supporting sleeve (2) is with on the mating surface of hook bearing support (4), buffer shaft (3) is with on the mating surface of quill (1), buffer shaft (3) is with on the mating surface of mobile armature (5), on hook (6) hinge hole internal face and the flank of tooth, the hinge hole internal face of connecting rod (7) is provided with surfacing wearing layer or build-up wear-resistant layer.
8. a kind of long-life hook assembly according to claim 7, it is characterized in that, the thickness of described surfacing wearing layer is all between 0.1-3mm.
9. a kind of long-life hook assembly according to claim 7, is characterized in that, more than one of the tooth bar on described hook (6).
10. a kind of long-life hook assembly according to claim 9, it is characterized in that, the face width of tooth of described tooth bar is between 2.2mm ~ 5.35mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185505A (en) * | 2015-08-11 | 2015-12-23 | 喻杰 | Improved structure for magnetic poles and armatures applied to latch assembly |
| CN106531259A (en) * | 2016-11-14 | 2017-03-22 | 上海第机床厂有限公司 | Claw shell assembly and machining method |
| CN108231217A (en) * | 2018-01-23 | 2018-06-29 | 上海第机床厂有限公司 | Presurized water reactor control rod drive mechanism and its assembly method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116393A (en) * | 1975-04-04 | 1976-10-13 | Hitachi Ltd | A control rod driving mechanism |
| US4124442A (en) * | 1977-05-10 | 1978-11-07 | Zhuchkov Ivan I | Regulating rod drive of nuclear reactor |
| CN87102001A (en) * | 1987-03-20 | 1988-01-13 | 湖南省冶金材料研究所 | The technology of surface sculf-resistant coat spraying of refractory die sets |
| CN102294573A (en) * | 2011-07-27 | 2011-12-28 | 上海第一机床厂有限公司 | Manufacturing method of falcula |
| CN102500864A (en) * | 2011-11-08 | 2012-06-20 | 中科华核电技术研究院有限公司 | Cobalt-base alloy overlaying method of claw of control rod driving mechanism of nuclear power station |
| CN103921013A (en) * | 2014-05-07 | 2014-07-16 | 四川华都核设备制造有限公司 | Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method |
-
2015
- 2015-03-24 CN CN201510128539.XA patent/CN104751921A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116393A (en) * | 1975-04-04 | 1976-10-13 | Hitachi Ltd | A control rod driving mechanism |
| US4124442A (en) * | 1977-05-10 | 1978-11-07 | Zhuchkov Ivan I | Regulating rod drive of nuclear reactor |
| CN87102001A (en) * | 1987-03-20 | 1988-01-13 | 湖南省冶金材料研究所 | The technology of surface sculf-resistant coat spraying of refractory die sets |
| CN102294573A (en) * | 2011-07-27 | 2011-12-28 | 上海第一机床厂有限公司 | Manufacturing method of falcula |
| CN102500864A (en) * | 2011-11-08 | 2012-06-20 | 中科华核电技术研究院有限公司 | Cobalt-base alloy overlaying method of claw of control rod driving mechanism of nuclear power station |
| CN103921013A (en) * | 2014-05-07 | 2014-07-16 | 四川华都核设备制造有限公司 | Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method |
Non-Patent Citations (1)
| Title |
|---|
| 兰银辉 等: "CPR1000、AP1000 和 EPR 控制棒驱动机构及材料差异分析", 《热处理技术与装备》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185505A (en) * | 2015-08-11 | 2015-12-23 | 喻杰 | Improved structure for magnetic poles and armatures applied to latch assembly |
| CN106531259A (en) * | 2016-11-14 | 2017-03-22 | 上海第机床厂有限公司 | Claw shell assembly and machining method |
| CN108231217A (en) * | 2018-01-23 | 2018-06-29 | 上海第机床厂有限公司 | Presurized water reactor control rod drive mechanism and its assembly method |
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