CN107282854A - A kind of manufacturing process of nuclear power retaining ring - Google Patents

A kind of manufacturing process of nuclear power retaining ring Download PDF

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Publication number
CN107282854A
CN107282854A CN201710686467.XA CN201710686467A CN107282854A CN 107282854 A CN107282854 A CN 107282854A CN 201710686467 A CN201710686467 A CN 201710686467A CN 107282854 A CN107282854 A CN 107282854A
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China
Prior art keywords
bulging
retaining ring
ring
temperature
nuclear power
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CN201710686467.XA
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CN107282854B (en
Inventor
张伟
李跃文
李剋蒙
李政军
张晏龙
李梦启
李雅范
郑吉伟
其他发明人请求不公开姓名
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YANTAI TAIHAI MANOIR NUCLEAR EQUIPMENT CO Ltd
Harbin Electric Power Equipment Co Ltd
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YANTAI TAIHAI MANOIR NUCLEAR EQUIPMENT CO Ltd
Harbin Electric Power Equipment Co Ltd
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Publication of CN107282854A publication Critical patent/CN107282854A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/76Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/761Making machine elements elements not mentioned in one of the preceding groups rings

Abstract

The present invention relates to the manufacturing process of nuclear power retaining ring, its processing step includes forging bar and roughing, blank hot extrusion, the machining of ring billet, ring billet solution treatment, pre- bulging and main bulging etc..The beneficial effect that the present invention reaches is can to realize the manufacture of the retaining ring of highest performance level (8 grades) in ASTM A289M standards, wherein 95 105 DEG C of drawing by high temperature yield strength average out to 1220MPa, elongation percentage average out to 22%, performance profile is uniform;And retaining ring production is stable, and cracking is less prone in process of production.

Description

A kind of manufacturing process of nuclear power retaining ring
Technical field
The present invention relates to a kind of manufacturing process of nuclear power retaining ring, belong to metal working technical area.
Background technology
AP1000 and CP1400 are one of main force's heap-type of China's three generations's PWR of Nuclear Power Station.AP1000's and CAP1400 Reactor coolant main circulation pump (hereinafter referred to as main pump) using single-stage, hermetically sealed, high moment of inertia, protected type it is electronic Pump, it is unique slewing in primary Ioops system, is the heart of nuclear island, belongs to nuclear safety first device, is presurized water reactor core One of the key equipment in power station.The maximum feature of Coolant Pump is exactly no axle envelope, and zero leakage can be achieved, and security is higher, This advantage is increasingly valued under the trend that three generations's nuclear power technology is continued to develop.For increase main pump rotary inertia, extend running down Time, both sides are respectively arranged 1 set of flywheel assembly above and below main pump motor, and flywheel assembly is mainly by several piece heavy metal tungsten alloy warm It is enclosed in the stainless 18 N steel guard ring of high intensity, high rigidity and constitutes.Flywheel retaining ring military service operating mode is complicated, in rotation at a high speed, high-intensity magnetic field, Under the conditions of moist corrosive medium, comprehensive mechanical property requires high (reaching 8 grades of ASTM A289M highest rankings), be in nuclear island only The large forgings of one necessary cold deformation strengthening, manufacturing process is extremely complex, at present whole dependence on import, as main pump motor The bottleneck problem of production domesticization.Compared to other fired power generating unit retaining rings, the high performance retaining ring size such as nuclear power motor flywheel is smaller, Performance requirement is higher, alloying element content is higher, and shaping difficulty is very big, using traditional open die forging hot forging process and single cold expanding Shape technique is easily cracking, influences product quality, causes the problems such as performance is uneven, product percent defective is high.
The content of the invention
The present invention is big for prior art shaping difficulty, the easy cracking and performance rate is relatively low asks in Bulging Process There is provided a kind of manufacturing process of nuclear power retaining ring for topic.
The technical scheme that the present invention solves above-mentioned technical problem is as follows:A kind of manufacturing process of nuclear power retaining ring, its is special Part is that its processing step is:
First, forging bar, bar is forged into by steel ingot by the upsetting pull of three fire time;
2nd, bar roughing, sawing, carry out roughing by bar periphery, then by its sawing, are divided into hot extrusion to use Blank;
3rd, blank hot extrusion, is 1200 DEG C ± 20 DEG C by blank heating to temperature, and soaking time is not less than after 8h Stove, is placed in extrusion die, is persistently extruded using press, blank is got into circle hole shape into ring billet;
4th, the machining of ring billet, size is machined to bulging by the requirement of bulging process by ring billet;
5th, ring billet solution treatment, will pass through mach ring billet and carry out solid solubility temperature insulation with 1060 ± 20 DEG C of temperature, Soaking time 1-3 hours, afterwards quick water cooling;
6th, pre- bulging, is preheating to temperature in deformation by the ring billet after solution treatment and is not higher than 300 DEG C, using outer fluid infusion liquid Bulging device is pressed to carry out bulging, the speed of bulging is less than 2.5mm/min, and it is 6-20% to control central diameter deflection;
7th, main bulging, the ring billet after pre- bulging is not higher than 300 DEG C in deformation preheating temperature, using external fluid infusion hydraulic pressure Bulging device carries out bulging, and the speed of bulging is less than 2.5mm/min, and it is 32-52% to control central diameter deflection.
In order that technical scheme has more preferable effect and specific aim and real-time, can be to above-mentioned technology Scheme is further improved and refined:
Further, the steel ingot in described forging bar step is that nitrogen element content is 0.60-0.75%, using electroslag weight The steel ingot of process of smelting production, its diameter 600-800mm, length is not less than 1780mm, and weight is 5-6 tons, and surface is without slag runner defect.
Further, in described forging bar step the upsetting pull forging of three fire time is:By Heating Steel Ingots to temperature 1200 ± 20 DEG C, and soaking time is not less than 8h, carries out forging, the first fire time jumping-up to length is 1500-1800mm, and pulling is extremely Length is 1650-1950mm, and then by Heating Steel Ingots to 1200 ± 20 DEG C of temperature, soaking time is not less than after 8h, the second fire Jumping-up to length is 1100-1400mm, and pulling to length is 1600-1900mm, again by Heating Steel Ingots to temperature 1200 ± 20 DEG C, soaking time is not less than after 8h, and the 3rd fire time jumping-up to length is 1000-1350mm, and pulling to diameter 700-750mm is long Spend for 1200-1600mm, 20-50mm of pulling reduction in pass;After three forgings by steel ingot air cooling.
Further, in described bar roughing, sawing step, bar periphery is carried out by 710 ± 20mm of diameter thick Processing.
Further, the solution treatment is heated up to be not higher than 150 DEG C/h with speed, after solid solution is incubated, is come out of the stove Rapid water is cooled to not higher than 100 DEG C water outlets.
Further, solution heat treatment, the solution treatment are carried out to the ring billet after pre- tensioner ring after described pre- bulging Heated up to be not higher than 150 DEG C/h with speed, after solid solution is incubated, rapid water of coming out of the stove is cooled to not higher than 100 DEG C water outlets.
Further, stress-removal heat treatment is carried out after described main bulging, is to be heated up with being not higher than the 40 DEG C/h rate of heat addition, Ring billet after main bulging is incubated at a temperature of 350-400 DEG C, 6-12 hours is incubated, to be not higher than 20 DEG C/h cooldown rate stove It is cooled at 100 DEG C and comes out of the stove.
The need for for the processing for the retaining ring of some special-purposes, the aperture of retaining ring is entered during can reprocessing Row adjustment, the reaming of ring billet is carried out after blank hot extrusion step, the ring billet of hot extrusion aftershaping is used into saddle forging.
The present invention is significantly improved to traditional ring billet manufacturing process, is substituted with the technique of forging material joint hot extrusion Traditional jumping-up, punching, the free forging process of pulling.The such malleable temperature range of traditional free forging process production is narrow, easy appearance The retaining ring forged piece of crackle, can not still avoid the appearance of forge crack although taking the mode of many fire time of small deformation amount, have at any time Probably due to needing to remove breach and stop forging, production efficiency is influenceed, while removing the process of breach using flame or carbon arc air gouging In can produce stress concentration, local burning defect so that ftractureed repeatedly in follow-up forging process, internal soundness and production imitated Rate brings very big influence.And use after the new technology of forging bar joint hot extrusion, steel is on the one hand improved by forging bar Ingot as-cast structure, on the one hand by the molding mode of hot extrusion in mould, material all directions deform constrained not easy to crack, carbon steel Jacket also plays filmlubrication, reduction frictional resistance, at utmost reduces the possibility of cracking.Blank is three during hot extrusion Deformed under to compressive stress state, be conducive to making, eliminating steel ingot internal flaw up, improve interiors of products quality.Hot extrusion suppresses ring billet One step monolithic molding, production efficiency is also improved.
The present invention is also significantly improved to traditional cold bulging process, with the technique of expanding and reinforcing underlying strength twice It instead of single bulging process.The usual intensity of ring billet before cold expanding shape is relatively low, and plasticity and toughness are poor, and traditional handicraft is higher in order to reach Performance rate can only take larger cold expanding deformation amount, and with the increase of cold deformation, the plasticity and toughness of product are further Reduce and do not reach plasticity and toughness required value as defined in product, or even product is directly cracking and cause to scrap, traditional cold bulging The overall deformation difficulty of technique very big, yield rate is relatively low.After the new technology of expanding and reinforcing underlying strength twice, pass through first Secondary cold expanding shape improves the underlying strength of product, and subsequent solution treatment has softened tissue, improved plasticity and toughness again;Such On the basis of, the cold deformation needed for second follow-up of main bulging accordingly reduces, and the situation that spalling is scrapped is obviously improved, and Obtain the plasticity and toughness index such as ideal elongation percentage, ballistic work.
Due to being improved above manufacturing process, the achievable beneficial effect of manufacturing process of nuclear power retaining ring of the present invention Fruit is as follows:The frequency that crackle occurs in retaining ring hot forging declines 60%, and the finished product rate of retaining ring product less than 50% by bringing up to More than 90%, retaining ring performance rate is improved to 8 grades by 6 grades of ASTM A289M.Use the accessible specifics of this manufacturing process Energy level is summarized as follows:Room temperature tensile yield strength >=1345MPa, tensile strength >=1380MPa, elongation percentage >=14%, room temperature Ballistic work >=62J, 95-105 DEG C of drawing by high temperature yield strength and tensile strength average value reach 1220MPa, and elongation percentage average value reaches >=22%, grain size >=3 grade, residual stress≤26MPa.
Brief description of the drawings
Fig. 1 is hot extrusion process schematic diagram;
Schematic diagram when Fig. 2 is hot extrusion process final stage;
Fig. 3 is hydraulic expanding-forming schematic diagram;
Fig. 4 is hydraulic expanding-forming end of a period view.
Embodiment
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit Determine the scope of the present invention.
A kind of manufacturing process of nuclear power retaining ring, its processing step is:
First, material is selected, and selection nitrogen element content is 0.60-0.75%, the steel ingot produced using electroslag remelting process.Institute The steel ingot diameter 600-800mm stated, length is not less than 1780mm, and weight is 5-6 tons, and surface is without slag runner defect.Electroslag remelting is Refer to electroslag melt steel (electroslag remelting), be by the use of electric current by slag when the resistance heat that produces be used as thermal source The method for carrying out melting, its main purpose is to purify metals and obtain the fine and close steel ingot of clean even tissue.Through electroslag remelting Steel, purity is high, sulfur-bearing is low, non-metallic inclusion is few, surface of steel ingot is smooth, clean even compact, metallographic structure and chemical composition Uniformly.The as cast condition mechanical performance of Electro Slag Remelting Steel can reach or more than the index of same steel grade forging.The quality of electroslag ingot depends on closing The electroslag remelting process of reason and the appointed condition for ensureing electroslag process.Material is selected, and is to provide material for present invention implementation, therefore The main composition of non-invention.
2nd, forging bar, bar is forged into by selected steel ingot by the upsetting pull of three fire time.Its specific process is: By selected Heating Steel Ingots to 1200 ± 20 DEG C of temperature, soaking time is not less than after 8h, carries out the first fire time forging, the first fire Jumping-up to length is 1500-1800mm, and pulling to length is 1650-1950mm, then by Heating Steel Ingots to temperature 1200 ± 20 DEG C, soaking time is not less than after 8h, and the second fire time jumping-up to length is 1100-1400mm, and pulling to length is 1600- 1900mm, again by Heating Steel Ingots to 1200 ± 20 DEG C of temperature, soaking time is not less than after 8h, and the 3rd fire time jumping-up to length is 1000-1350mm, is pulled out to diameter 700-750mm, length is 1200-1600mm, pulls out 20-50mm of reduction in pass, in warp Cross steel ingot air cooling after three forgings.
3rd, bar roughing, sawing, carry out roughing by bar periphery, then by its sawing, are divided into hot extrusion to use Blank.Bar periphery is subjected to roughing, then by its sawing into section, the base as hot extrusion by 710 ± 20mm of diameter Material;In the present embodiment, cut by taking tri- kinds of retaining rings of ABC as an example, the parameter such as following table of three kinds of blanks,
Retaining ring code name Diameter mm Length mm Weight kg
Retaining ring A 730 670 2170
Retaining ring B 720 450 1450
Retaining ring C 710 440 1300
4th, blank hot extrusion, blank heating to temperature is 1200 DEG C ± 20 DEG C, and soaking time is not less than after 8h and come out of the stove, It is placed in extrusion die, is persistently extruded using press, blank is got into annular distance formation ring billet.The extruding that the present embodiment is used Device (referring to Fig. 1 and Fig. 2) includes:Base 1, sleeve 2, punching base 3, underlay 4, backing plate 5;Operation process is as follows, outside blank 7 Bread wraps carbon steel jacket 6, is collectively disposed in the mould of composition, puts drift 8 and positioning tube 9 well, under being continued using ten thousand tons of press Pressure drift 8 is extruded blank 7, blank 7, jacket 6 and the counter motion of positioning tube 9, when drift 8 is concordant with positioning tube 9, peace Joint 10 continues to push impact extrusion, and the final stage of extrusion process removes positioning tube 9 and underlay 4, and drift 8 continues to push, finally Bed material and backing plate 5 are gone out from punching base 3, hot extrusion is completed, retaining ring A, B, C is squeezed out respectively.The diameter of wherein drift 8 is According to the requirement of the internal orifice dimension of final retaining ring, and use the drift of corresponding size diameter.
5th, the machining of ring billet, size is machined to bulging by the requirement of bulging process by ring billet.The content of processing is The surplus of diameter and length direction is removed, because hot extrusion or cold expanding shape are all approximate shapings, therefore in hot extrusion Certain machining allowance is all left, is required for further machining to ensure its dimensional accuracy.Hydraulic bulging process is liquid During compression, constancy of volume and pressure is uniformly transferred to all directions, material at the best of times along die deformation, is reached into The purpose of shape.
6th, ring billet solution treatment, will pass through mach ring billet and carry out solid solubility temperature insulation with 1060 ± 20 DEG C of temperature, Soaking time 1-3 hours, afterwards quick water cooling.Ring billet programming rate by processing is not higher than 150 DEG C/h, by solid solution After insulation, rapid water is cooled to not higher than 100 DEG C water outlets after coming out of the stove;Solution treatment (solution treatment):Refer to alloy The constant temperature holding of high temperature monophase field is heated to, superfluous phase is fully dissolved into solid solution rear quick cooling, to obtain single phase solid solution The Technology for Heating Processing of body.Main function is the structural state for obtaining single phase austenite, to ensure that its is nonmagnetic;Simultaneously improve steel and The plasticity and toughness of alloy, eliminate stress and softening, to continue to process or to be molded.
7th, pre- bulging, the ring billet after solution treatment carries out bulging, bulging preheating temperature using external fluid infusion hydraulic pressure expanding device Not higher than 300 DEG C, the speed of bulging is less than 2.5mm/h, and it is 6-20%, solid solution again after pre- bulging terminates to control central diameter deflection Processing;For four kinds of retaining rings pointed in the 3rd step, pre- Bulging Process is will shield in bulging equipment (referring to Fig. 3 and Fig. 4) Ring 15 is placed on low punch 11, under upper punch 12 and pressure pad 13, and pressure pad 13, upper punch 12 are constantly pushed using ten thousand tons of press Moved down along power post 14 is subtracted, form sealing space, filled water in retaining ring by the inside fluid infusion of passage 17 using super-pressure pump Space and form high pressure, retaining ring produces uniform plastic deformation in the cold state, forms cold deformation strengthening;Cold deformation strengthening refers to Metal material is when less than crystallization temperature, under external force, there occurs the permanent irreversible transformation beyond elastic limit, leads Metal inside lattice is caused to be distorted, dislocation density increase makes the resistance increase for further sliding and deforming, thus metal material Intensity and hardness significantly improve, the phenomenon that moulding and toughness is decreased obviously;In engineering, occur when deflection is more than 0.2% Deformation be irreversible plastic deformation;With the continuation of pre- Bulging Process, the diameter of retaining ring constantly becomes big, height constantly contracting Small, thickness is constantly thinned, and its intensity is significantly improved.
8th, main bulging, the ring billet after pre- bulging is not higher than 300 DEG C in deformation preheating temperature, using external fluid infusion hydraulic pressure Bulging device carries out bulging, and the speed of bulging is less than 2.5mm/min, and it is 32-52% to control central diameter deflection.By pre- bulging Afterwards, before main bulging can pair with after bulging ring billet carry out solution treatment, deformation preheating temperature≤300 of ring billet solution treatment DEG C, 150 DEG C/h is not higher than with speed and heated up, after solid solution is incubated and (deforms preheating temperature≤300 DEG C), is come out of the stove quick Water cooling is to not higher than 100 DEG C water outlets.For three kinds of retaining rings mentioned above, the size after bulging see the table below shown;
9th, stress-removal is heat-treated, and the ring billet rate of heat addition after main bulging is not higher than 40 DEG C/h, is incubated at 350-400 DEG C 6-12 hours, it is furnace-cooled at 100 DEG C and can comes out of the stove to be not higher than 20 DEG C/h cooldown rate, nuclear power retaining ring is made.Should by disappearing Power heat treatment significantly reduces residual stress, to meet product service demand.Stress-removal heat treatment is the rear supplementary processing of technique Process step.
For some specific retaining rings of needs, it is necessary to carry out reaming after blank hot extrusion step, the reaming of ring billet, by heat The blank of extruding aftershaping uses saddle forging;Ring billet size after reaming is as follows:
Retaining ring code name External diameter mm Internal diameter mm Length mm Weight kg
Retaining ring A 800 520 800 1810
Retaining ring B 720 450 580 1130
Retaining ring C 680 430 640 1080
Retaining ring B therein can not reaming.
The nuclear power being made should carry out every physicochemical property inspection and nondestructive testing with retaining ring, be commented with being made to its performance indications Valency.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (8)

1. a kind of manufacturing process of nuclear power retaining ring, it is characterised in that its processing step is:
First, forging bar, bar is forged into by steel ingot by the upsetting pull of three fire time;
2nd, bar roughing, sawing, carry out roughing by bar periphery, then by its sawing, are divided into hot extrusion base Material;
3rd, blank hot extrusion, is 1200 DEG C ± 20 DEG C by blank heating to temperature, and soaking time is not less than after 8h and come out of the stove, and puts In extrusion die, persistently extruded using press, blank is got into circle hole shape into ring billet;
4th, the machining of ring billet, size is machined to bulging by the requirement of bulging process by ring billet;
5th, ring billet solution treatment, will be by mach ring billet with 1060 ± 20 DEG C of temperature progress solid solubility temperature insulation, insulation 1-3 hours time, afterwards quick water cooling;
6th, pre- bulging, is preheating to temperature in deformation by the ring billet after solution treatment and is not higher than 300 DEG C, swollen using external fluid infusion hydraulic pressure Shape dress puts carry out bulging, and the speed of bulging is less than 2.5mm/min, and it is 6-20% to control central diameter deflection;
7th, main bulging, the ring billet after pre- bulging is not higher than 300 DEG C in deformation preheating temperature, using external fluid infusion hydraulic pressure expanding Device carries out bulging, and the speed of bulging is less than 2.5mm/min, and it is 32-52% to control central diameter deflection.
2. the manufacturing process of nuclear power retaining ring according to claim 1, it is characterised in that to passing through after described pre- bulging Ring billet after pre- bulging carries out solution heat treatment, and the solution treatment is heated up to be not higher than 150 DEG C/h with speed, by solid After molten insulation, rapid water of coming out of the stove is cooled to not higher than 100 DEG C water outlets.
3. the manufacturing process of nuclear power retaining ring according to claim 1, it is characterised in that in described forging bar step Steel ingot be that nitrogen element content is 0.60-0.75%, the steel ingot produced using electroslag remelting process, its diameter 600-800mm is long Degree is not less than 1780mm, and weight is 5-6 tons, and surface is without slag runner defect.
4. the manufacturing process of nuclear power retaining ring according to claim 3, it is characterised in that in described forging bar step The upsetting pull forgings of three fire time be:By Heating Steel Ingots to 1200 ± 20 DEG C of temperature, and soaking time is not less than 8h, is forged System, the first fire time jumping-up to length is 1500-1800mm, and pulling to length is 1650-1950mm, then by Heating Steel Ingots to temperature 1200 ± 20 DEG C of degree, soaking time is not less than after 8h, and the second fire time jumping-up to length is 1100-1400mm, and pulling to length is 1600-1900mm, again by Heating Steel Ingots to 1200 ± 20 DEG C of temperature, soaking time is not less than after 8h, and the 3rd fire time jumping-up is extremely Length is 1000-1350mm, is pulled out to diameter 700-750mm, length is 1200-1600mm, pulling reduction in pass 20- 50mm;After three forgings by steel ingot air cooling.
5. the manufacturing process of nuclear power retaining ring according to claim 4, it is characterised in that described bar roughing, saw Cut in step, bar periphery is subjected to roughing by 710 ± 20mm of diameter.
6. the manufacturing process of nuclear power retaining ring according to claim 1, it is characterised in that the solution treatment is with speed Not higher than 150 DEG C/h is heated up, after solid solution is incubated, and rapid water of coming out of the stove is cooled to not higher than 100 DEG C water outlets.
7. the manufacturing process of nuclear power retaining ring according to claim 1, it is characterised in that disappeared after described main bulging Stress is heat-treated, and is to be heated up with being not higher than the 40 DEG C/h rate of heat addition, the ring billet after main bulging is protected at a temperature of 350-400 DEG C Temperature, is incubated 6-12 hours, is furnace-cooled at 100 DEG C with to be not higher than 20 DEG C/h cooldown rate and come out of the stove.
8. the manufacturing process of nuclear power retaining ring according to claim 7, it is characterised in that laggard in blank hot extrusion step The reaming of row ring billet, saddle forging is used by the ring billet of hot extrusion aftershaping.
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CN109719249A (en) * 2018-12-29 2019-05-07 贵州航宇科技发展股份有限公司 A kind of expansion forming method of the high cylinder part of Ta1 material thin wall

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108237197A (en) * 2017-12-07 2018-07-03 陕西宏远航空锻造有限责任公司 A kind of forging method for improving the flaw detection of structural steel large-sized ring part
CN109719249A (en) * 2018-12-29 2019-05-07 贵州航宇科技发展股份有限公司 A kind of expansion forming method of the high cylinder part of Ta1 material thin wall

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