CN101745782A - Method for manufacturing hot segment of bent pipe of main pipeline of reactor - Google Patents
Method for manufacturing hot segment of bent pipe of main pipeline of reactor Download PDFInfo
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- CN101745782A CN101745782A CN200810306436A CN200810306436A CN101745782A CN 101745782 A CN101745782 A CN 101745782A CN 200810306436 A CN200810306436 A CN 200810306436A CN 200810306436 A CN200810306436 A CN 200810306436A CN 101745782 A CN101745782 A CN 101745782A
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Abstract
The invention discloses a method for manufacturing the hot segment of a bent pipe of a main pipeline of a reactor for a third generation of nuclear power station, which can meet the technical requirement of the reactor of the third generation of the nuclear power station to the pipe and guarantee the machining quality of a pipe mouth. The method comprises the steps of: A. preparing a combined type forming module which comprises an upper module, a lower module and a core module, wherein the core module is made from method, is formed by a plurality of blocks which are arranged along the axial direction, and leads the filling rate of the inner space of a filling pipe body of the core module to be larger than 95%, wherein the filling ratio is volume ratio of the volume of the core module and the inner space of the pipe; B. preparing a straight tubular pipe blank according to the structural shape of each part of the pipe body; C. mechanically machining the pipe blank and machining the inner hole and the outer periphery of the pipe body; D. filling the core module into the pipe blank, and putting the core module between the upper model and the lower module to be formed by means of pressing; and E withdrawing the core module, and mechanically machining the end faces of the two ends of the pipe body, as well as the end face, the inner hole and the outer periphery of the pipe mouth. The method can be used for manufacturing an intergraded large-sized pipe part with a straight pipe segment and a bent segment.
Description
Technical field
The present invention relates to a kind of manufacture method that is used for the hot segment of bent pipe of main pipeline of reactor of third generation nuclear power station.
Background technology
At present, the advanced large-scale AP1000 pressurized-water reactor nuclear power plant of the third generation, be at present in the world two generation nuclear power station and two generations add the update type of nuclear power station.Its major advantage have service life from before be increased to 60 years in 40 years, the installed capacity of single seat nuclear power station reaches 1,250,000 kilowatts.Because technology improves, and requires equipment to reduce weld seam as far as possible, reduced a lot of in labour work for inspection amount, advantage such as also have compact conformation, security is good, generated energy is big, but shortcomings such as manufacture difficulty is big are also arranged.It is integrated that its hot segment of bent pipe of main pipeline makes stainless steel monobloc forging band ozzle into by original stainless steel segmentation foundry goods (straight tube adopts centrifugal casting and elbow to adopt conventional cast) welding, and straight tube, elbow, the nozzle design of segmentation become integrated forging, strengthened the difficulty of making.The AP1000 reactor is not also being built unit at present, China takes the lead in starting this type, and hot segment of bent pipe of main pipeline also requires to be the monobloc forging formula and to be with ozzle, because of complex-shaped, manufacture difficulty is very big, and manufacturing and designing scheme is that the method with machining processes after the solid forging.The required stainless steel ingot of forging reaches 150 tons, and pipe orifice almost is difficult to process with the method for machinery, and the tissue of forging and performance also are difficult to guarantee.
The AP1000 hot segment of bent pipe of main pipeline all also there is not ripe manufacturing technology both at home and abroad at present, it is super-low carbon stainless steel heavy forging (316LN), therefore similar products like in the world all seldom, all has more technological difficulties on operations such as smelting, forging, brake forming, machined.Hot leg elbow one end length of straight pipe 2235mm, other end length of straight pipe 1234mm, the centre is the 1.5D bend radius bent pipe, and two integrated ozzles is being arranged shown in Fig. 1～4 near the crooked position place.The external diameter of this hot leg elbow is 952.5mm, and internal diameter is 787.4mm, and the angle of bend of bending section is 56.4 °, and its specification requirement is: crooked position out-of-roundness≤4%, crooked back of the body arc attenuate amount≤12.5%, nominal wall thickness 82.55mm, minimum wall thickness (MINI W.) 72.2mm.
The technological difficulties of above-mentioned hot leg elbow machine-shaping are:
1, bending radius is the bending of 1.5D two ends band straight tube.
The bending radius of elbow is 1D～1.5D, and straight length is not with at two ends, and bend pipe just is with straight length.The manufacturing process of elbow has two kinds, and the one, compression moulding, the 2nd, pick the type of making.The manufacturing process of bend pipe is the Frequency Induction Heating bend pipe, the bending radius of bend pipe is general 〉=and 3D, if bending radius is less than 3D, the ovality of crooked position and attenuate amount can fiercely increase, when bending radius was 1.5D, the attenuate amount of bend pipe back of the body arc was up to 25%, and ovality ≈ 15%.
The compression molding elbow, the contour shape of its blank is trapezoidal.The trapezoidal bottom edge lengths is the length of run of the outer camber line of elbow, and trapezoidal top margin length is the length of run of camber line in the elbow.During brake forming, blank brake forming under the effect of interior external mold.Figure 10 is a 1.5D major radius elbow compression moulding schematic diagram, and Figure 11 is 1.5D major radius elbow blank figure.The filling rate that its core is filled space in the body generally has only about 80%, and the filling rate here is core volume and the ratio of managing interior spatial volume.Therefore, the ovality of product crooked position nearly 15%.This technology is the conventional process of elbow compression moulding.
Behind the two sideband straight tubes, blank just can not be made into trapezoidal, can only make the straight tube shape.The inner arc metal can only compress when crooked, and the outer arc metal can only stretch, and when not taking measures, the attenuate of outer arc is up to 33%.Therefore, the crooked difficulty of the bend pipe of two ends band straight tube and radius of curvature R=1.5D is very big.
2, have two ozzles respectively near the crooked position place.
After ozzle and bend pipe are integrated, increased great difficulty for the design of compacting tool set, and the metal at ozzle position can not get even compression in when making moulding, asymmetric outer tube mouth steric hindrance has been ended when stretching flowing of metal and has been replenished.
It is that 200810300744.X, name are called the application for a patent for invention of " hot segment of bent pipe of main pipeline of reactor and manufacture method thereof " that the applicant has submitted application number on March 27th, 2008, technical scheme in this application is at the design feature of AP1000 hot segment of bent pipe of main pipeline of reactor, employing comprises the combined shaping mold of upper die and lower die and core, and the pipe of straight tube-like is obtained hot segment of bent pipe of main pipeline of reactor by compression moulding.Core adopts metal to make, and makes filling rate that core fills space in the body greater than 95%, so just can further guarantee its briquetting pressure can evenly be transmitted, and is convenient to the evenly mobile of metal, and the while also can guarantee the circularity requirement of product.In order to guarantee the quenching degree of product, before compacting, earlier pipe is carried out machined, process the endoporus and the excircle of body endoporus and excircle, ozzle.But because the effect of internal force in the influence of metal flow and the bend pipe deformation process in pressing process, the endoporus of the ozzle that processes and excircle bigger distortion can occur after compacting, thereby having to after compacting is finished once more, endoporus and the excircle to ozzle carries out machined, not only increased mach processing capacity, simultaneously because being shaped as after the ozzle distortion is non-circular, thereby cause bigger form and position tolerance easily, increased mach difficulty.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacture method that satisfies the specification requirement of third generation nuclear power station and can guarantee the hot segment of bent pipe of main pipeline of reactor of ozzle crudy.
The technical solution adopted for the present invention to solve the technical problems is: the manufacture method of hot segment of bent pipe of main pipeline is characterized in that: comprise the steps:
A, making comprise the combined shaping mold of upper die and lower die and core, and core adopts metal to make, and core is made of the polylith of arranging vertically and makes core fill the filling rate in space in the body greater than 95%; Wherein, filling rate is core volume and the ratio of managing interior spatial volume;
B, produce the pipe of straight tube-like according to the each several part construction profile of body;
C, pipe is carried out machined, process body endoporus and excircle;
D, with the core pipe of packing into, place compression moulding between patrix and the counterdie then;
E, taking-up core, the end face at machined body two ends and end face, endoporus and the excircle of ozzle thereof;
F, full surface finish.
Further be behind step C, to carry out ultrasonic examination.
Further be behind step D, whole body to be carried out solution treatment.
Further be after step F, to carry out liquid penetration test and ultrasonic examination for the second time.
As the optimization to technique scheme, the filling rate that core is filled space in the body is 97.5%.
The invention has the beneficial effects as follows: because the integrative-structure of hot segment of bent pipe of main pipeline employing solid forging and bending section are by compression molding, not only satisfied the specification requirement of hot segment of bent pipe of main pipeline, compare with mach hot segment of bent pipe of main pipeline simultaneously, the metal structure of its body and performance can obtain more effectively guaranteeing, also reduced the machined difficulty simultaneously, the metal cutting amount is few, and blank weight reduces more than 50%, greatly reduces processing and manufacturing difficulty and cost.Solid ozzle is out of shape little in the process of compression molding, after mold pressing is finished the processing ozzle is carried out machined and can guarantee its machining accuracy, a whole set of mould does not have difficulty of processing, just can make with general machining apparatus, also can be applicable to have the processing and fabricating of the integrated large-size pipe of straight length and bending section.
Description of drawings
Fig. 1 is the front view of a kind of hot segment of bent pipe of main pipeline of reactor of version among the present invention.
Fig. 2 is along the cutaway view of A-A direction among Fig. 1.
Fig. 3 is along the cutaway view of B-B direction among Fig. 1.
Fig. 4 is the front view of the hot segment of bent pipe of main pipeline of reactor of another kind of version among the present invention.
Fig. 5 is the cutaway view of a kind of pipe of hot segment of bent pipe of main pipeline of reactor of version among the present invention.
Fig. 6 is the cutaway view of the pipe of the hot segment of bent pipe of main pipeline of reactor of another kind of version among the present invention.
Fig. 7 is that employing of the present invention is combined into pattern carries out processing and forming to the camber section schematic diagram.
Fig. 8 is the cutaway view along C-C direction among Fig. 7.
Fig. 9 is the matching relationship decomposing schematic representation of core under core and the matrix under the convex among Fig. 7.
Figure 10 is an elbow compression moulding schematic diagram commonly used.
Figure 11 is 1.5D major radius elbow blank figure.
Be labeled as among the figure: core 102, shoulder plane 11, straightway metope 12 under core 101, the matrix under core 10, the convex under core 9, the bending section under core 8, the straight length on core 7, the bending section on bending section 1, straight length 2, ozzle 3, patrix 4, counterdie 5, chock 6, the straight length, cavity 13, projection 14, groove 15.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1～shown in Figure 9, hot segment of bent pipe of main pipeline of reactor of the present invention, comprise on the bending section 1 of radius of curvature R=1.5D, the straight length 2 that is arranged on bending section 1 two ends and the straight length 2 body that two ozzles 3 that the position near bending section 1 is provided with constitute, D is the body external diameter.Body can adopt super-low carbon stainless steel to make, and body is the integrative-structure of solid forging.Wherein, bending section 1 is by compression molding, and straight length 2 and ozzle 3 adopt the machined moulding.Bending section 1 more can guarantee metal structure and the performance of body than bending section 1 by the machined moulding by compression molding, thereby effectively guarantees the specification requirement and the combination property of its body.
The distributing position of two ozzles 3 of above-mentioned hot segment of bent pipe of main pipeline of reactor can be following version, a kind ofly is: two ozzles 3 are separately positioned on the straight length 2 at bending section 1 two ends, and the axis of two ozzles 3 is not at grade; Another kind is: two ozzles 3 are arranged on the straight length 2 of bending section 1 one ends simultaneously, and the axis of two ozzles 3 is in the same plane.
The manufacture method of hot segment of bent pipe of main pipeline comprises the steps:
A, make the combined shaping mold comprise patrix 4, counterdie 5 and core 6, core adopts metal to make, thereby can pack into from the straight tube of pipe easily, and the demoulding the body bending section behind bend pipe easily; During the design core, core is made of the polylith of arranging vertically and makes its core fill the filling rate in space in the body greater than 95%, preferably reach 97.5%, so just can further guarantee its briquetting pressure can evenly be transmitted, be convenient to evenly flowing of metal, also can guarantee the circularity requirement of product simultaneously;
B, produce the pipe of straight tube-like according to the each several part construction profile of body;
C, pipe is carried out machined, process body endoporus and excircle.
D, with the core pipe of packing into, place compression moulding between patrix 4 and the counterdie 5 then, form the bending section 1 of body;
E, taking-up core, the end face at machined body two ends and end face, endoporus and the excircle of ozzle 3 thereof;
F, full surface finish.
Behind above-mentioned steps C, carry out ultrasonic examination, can further guarantee quality of tube blank steel.
Behind above-mentioned steps D, whole body is carried out solution treatment, after step F, carry out liquid penetration test and the work of ultrasonic wave spy for the second time, further strengthen the structure property of workpiece, guarantee crudy.
The combinations thereof mould, comprise patrix 4, counterdie 5 and core, core adopts metal to make, patrix 4 and counterdie 5 be provided with body on the position and the suitable cavity 13 of size of ozzle 3, core is filled the filling rate in space in the body greater than 95%, preferably reaches 97.5%.
Core comprises core and a plurality of chock 6 formations under core on the polylith, the polylith, the quantity of last core, following core is many more, can guarantee volume that core fills space in the pipe of body of hot segment of bent pipe of main pipeline more greater than 95%, thereby reach the specification requirement of the out-of-roundness of the bending section of body, crooked back of the body arc attenuate amount etc.Chock 6 be arranged between core and the following core and the diameter of the width of chock 6 and body endoporus suitable, the axis of chock 6 is on the axis of body endoporus, is used for wedging and withdraws from core.Last core, down the quantity of core and chock 6 equates, the last core of corresponding position, position, descends core and chock 6 length on the axially bored line in body suitable, thereby makes it can phase mutual interference when bend pipe.Wherein:
A, go up core and comprise on two straight lengths core 8 on the core 7 and polylith bending section, the length of core 7 is mated with the length of the straight length 2 of corresponding body on the straight length, on the polylith bending section core 8 stacked arrangement and stacked after the length and the inner hole wall arc length of the bending section 1 of body suitable, thereby guarantee the smooth smooth of circular arc in the bending section of body.
B, following core comprises under the straight length core 10 under the core 9 and polylith bending section, the length of core 9 is mated with the length of the straight length 2 of corresponding body under the straight length, core 10 is made up of core 102 under core 101 and the matrix under the polylith convex under the bending section, the shoulder plane 11 of core 101 is provided with axial projection 14 under the convex, the shoulder plane 11 of core 102 is provided with axial groove 15 under the matrix, core 101 under the adjacent convex, the 11 mutual planes contact of shoulder plane and the projection 14 of core 102 cooperates with groove 15 under the matrix, and core 101 under the polylith convex, under the matrix core 102 at interval stacked arrangement and stacked after the length and the interior axially bored line arc length of the bending section 1 of body suitable; The above-mentioned stacked arrangement of core 102 under core 101, the matrix under the polylith convex, the one, whole core is played circumferential positioning action, relatively moving of circumferencial direction can not take place in parts adjacent in the promptly whole core; The 2nd, in forming process, only be on the shoulder plane of plane contact, to slide but do not break away from plane contact between the core 102 under core 101, the matrix under the adjacent convex, make the axial arc of bend pipe after the moulding good, there is not ring sample defective, promptly surfacing is smooth.
In order to guarantee the circularity requirement of product, counterdie 5 both sides are straightway metope 12, and patrix 4 is inserted between the straightway metope 12 of counterdie 5, and the width between the straightway metope 12 of the width of patrix 4 and counterdie 5 both sides is suitable.Like this, the bending section 1 that makes its body can both obtain the guard circle protection from managing bad straight tube in the process of whole brake forming.
Claims (5)
1. the invention discloses a kind of manufacture method that is used for the hot segment of bent pipe of main pipeline of reactor of third generation nuclear power station, can satisfy third generation nuclear power plant reactor to the specification requirement of this pipe and can guarantee the ozzle crudy.This pipe body is the integrative-structure of solid forging, and bending section is filled space in the pipe of body by core volume is greater than 95% combined shaping mold compression molding, and straight length and ozzle adopt the machined moulding.Not only can satisfy the specification requirement of hot segment of bent pipe of main pipeline, also can guarantee the machining accuracy of ozzle, guarantee the metal structure and the performance of body, also reduce the machined difficulty, the metal cutting amount is few, greatly reduces processing and manufacturing difficulty and cost.A whole set of mould does not have difficulty of processing, just can make with general machining apparatus, can be applicable to have the processing and fabricating of the integrated large-size pipe of straight length and bending section.
2. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 1 is characterized in that: carry out ultrasonic examination behind step C.
3. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 2 is characterized in that: behind step D whole body is carried out solution treatment.
4. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 3 is characterized in that: carry out liquid penetration test and ultrasonic examination for the second time after step F.
5. as the manufacture method of claim 1,2,3 or 4 described hot segment of bent pipe of main pipeline of reactor, it is characterized in that: the filling rate that core is filled space in the body is 97.5%.
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Cited By (5)
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| CN102248047A (en) * | 2011-06-01 | 2011-11-23 | 二重集团（德阳）重型装备股份有限公司 | Combined mandrel used for die-pressing of elbow tube and application method thereof |
| CN103341724A (en) * | 2013-05-30 | 2013-10-09 | 中国钢研科技集团有限公司 | Process of producing nuclear power plant main pipeline forge piece through centrifugal casting hollow ingot |
| CN105478595A (en) * | 2016-01-20 | 2016-04-13 | 二重集团（德阳）重型装备股份有限公司 | Gap type manufactured core die of nuclear power voltage stabilizer fluctuation pipe and manufacturing method |
| CN111076006A (en) * | 2019-11-29 | 2020-04-28 | 无锡曙光模具有限公司 | Air inlet end cone shell structure of automobile air inlet system and machining process of air inlet end cone shell structure |
| CN111185722A (en) * | 2018-11-15 | 2020-05-22 | 核工业西南物理研究院 | U-shaped bending forming method for asymmetric flat plate with runner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105478595A (en) * | 2016-01-20 | 2016-04-13 | 二重集团（德阳）重型装备股份有限公司 | Gap type manufactured core die of nuclear power voltage stabilizer fluctuation pipe and manufacturing method |
| CN111185722A (en) * | 2018-11-15 | 2020-05-22 | 核工业西南物理研究院 | U-shaped bending forming method for asymmetric flat plate with runner |
| CN111185722B (en) * | 2018-11-15 | 2021-09-17 | 核工业西南物理研究院 | U-shaped bending forming method for asymmetric flat plate with runner |
| CN111076006A (en) * | 2019-11-29 | 2020-04-28 | 无锡曙光模具有限公司 | Air inlet end cone shell structure of automobile air inlet system and machining process of air inlet end cone shell structure |
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Application publication date: 20100623 |