CN102451976A - Manufacturing method for hot arc bent pipe of AP1000 nuclear power main pipeline - Google Patents
Manufacturing method for hot arc bent pipe of AP1000 nuclear power main pipeline Download PDFInfo
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- CN102451976A CN102451976A CN2010105247661A CN201010524766A CN102451976A CN 102451976 A CN102451976 A CN 102451976A CN 2010105247661 A CN2010105247661 A CN 2010105247661A CN 201010524766 A CN201010524766 A CN 201010524766A CN 102451976 A CN102451976 A CN 102451976A
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Abstract
The invention discloses a manufacturing method for a hot arc bent pipe of an AP1000 nuclear power main pipeline. A horizontal numerical control boring-milling machine is adopted, a lengthened cutter row is taken as a cutter of a machine tool, and processing comprises pipe bending of a short straight pipe section, a long straight pipe section and a bent pipe section. The processing process comprises the following steps of: I, processing a straight pipe section in a boring-milling way; and II, processing a bent pipe section. In a procedure 1, the inner wall of the bent pipe section is processed by separately processing an upper half oval and a lower half oval; and in a procedure 2, the outer wall of the bent pipe section is processed. In the invention, the inner wall of the bent pipe section is processed by adopting a half-long-axis semi-oval section planetary milling method, i.e., a rule is found from a variant oval section and is used for performing imitation processing on a bent pipe, so that machining of the bent pipe is realized, and the problem of difficulty in machining the bent pipe is solved.
Description
Technical field
The present invention relates to a kind of metal cutting machinery processing technology, be specifically related to a kind of manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow.
Background technology
Along with the development of nuclear power, the requirement of nuclear power generating equipment is improved constantly.The AP1000 nuclear power station of third generation nuclear power technology---US Westinghouse company is the state-of-the-art nuclear power station in the current whole world, and its power is 100 megawatts, and Equipment Design service life is 60 years.
Trunk line is one of nuclear power station ten big main equipments, is the critical piece in nuclear power station nuclear reactor one loop.Trunk line couples together pressure vessel, the evaporimeter main pump of nuclear reactor forms a loop checking installation.The heat that nuclear reactor pressure container produces passes to evaporimeter by medium through main pipe hot leg; Cooled medium is sent back in the nuclear reactor pressure container by main pump through cold section of trunk line again, forms a loop heat-exchange system of an annular.
Trunk line is made up of cold section, hot arc, changeover portion three parts, is divided into straight tube and bend pipe.The condition of work of trunk line is high temperature (350 ℃ of design temperatures), high pressure (design pressure 17MPa), and receiving flow velocity in the pipeline is washing away of 11 meter per second media, and medium has the radioactive element of high dose, therefore also receives the corrosion of medium.In case a return takes place to reveal or malicious event, the harm that causes is with hardly imaginable.
According to the condition of work of trunk line, the design principle of AP1000 trunk line is: reduce the weld seam relevant with reactor tunnel as far as possible, reduce the workload of inservice inspection as far as possible, exposure dosage reduces a staff; Shorten the time of inservice inspection, shorten and reload the time,, increase economic efficiency to improve the electric power factory equipment availability; Reactor tunnel does not have installation and " regulates section ", and its two ends directly are connected with steam generator with reactor pressure vessel.Therefore, requiring reactor tunnel is the solid forging that has pressure inlet more than 4 inches, and high manufacturing accuracy is to guarantee that installation process once is connected into merit.Be limited to above design principle, the structure of AP1000 hot segment of bent pipe of main pipeline is: outside dimension Φ 965, and internal diameter size Φ 785, thickness of pipe wall δ=90mm, the crooked attenuation rate of bend pipe＜15%, ozzle and pipe design are one.
The trunk line of first generation nuclear power product, France is sand casting, material is CF8M; Russia adopts the electroslag smelting casting method to make bend pipe, and is better than sand casting.
The trunk line of second generation nuclear power product, trunk line require forging to adopt steel ingot to be swaged into long cylinder forgings, are machined to straight tube (also can adopt extrusion to produce bigbore seamless pipe) again, utilize straight tube clod wash or the shaping of high-frequency heating hot bending on bending machine.Must carry out solutionizing before the production of clod wash bend pipe and handle, improve plasticity and toughness, prevent that internal stress is high, the clod wash total deformation will be controlled at below 30%, divide several times and carry out.To do de-stress annealing or solution treatment between each.Because clod wash must make material produce flow harden, the little R of bend pipe place stress is concentrated.
For the higher third generation nuclear power product of designing requirement, blank requires to be forging, and diameter strengthens than AP600 before; The length lengthening, 56.4 ° of the flexibility of circular arc are bigger, and the manufacturing approach of first generation product is infeasible; The manufacturing approach of second generation product be difficult to meet the demands (even can not realize); Also do not have a tame unit ability clod wash or hot bending to go out so large diameter pipeline at present in the world, at most can only bend general shape and size yet, bend well and afterwards also need carry out fine finishining.Lathe and Selection of Cutting also are big difficult points, must calculate accurately, and especially the inboard processing of bend pipe is very difficult.The processing of this pipeline is a challenge for present international process technology.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow, and it can carry out machined to hot leg elbow.
For solving the problems of the technologies described above, the technical solution of the manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow of the present invention is:
Adopt horizontal digital-control boring-milling machine, the cutter of lathe adopts the spreading blade row, and processing comprises the bend pipe of short straight tube section, long straight length, bend loss, and process may further comprise the steps:
The first step adopts the mode of boring and milling to process straight length;
Second step, the processing bend loss;
The mode of operation 1, employing upside of ellipse and following semiellipse separate machined, the inwall of processing bend loss;
Process the upside of ellipse of bend loss earlier: cutter gets into the bend loss part along the direction of short straight tube section axial line, adopts main shaft adjunction rimmer knife row, is guaranteeing under the situation that main shaft and hole wall do not bump the first area of circular arc in first of elder generation's processing short straight tube section one side;
Guarantee that then main shaft and hole wall do not bump, keep the height of main shaft constant, be machined to maximum length, accomplish processing short straight tube section one side second area of circular arc in first;
Let cutter get into the bend loss part again, process remaining first circular arc along the direction of long straight length axial line, accomplish to long straight length one side in first circular arc the 3rd, four-range processes;
Process the following semiellipse of bend loss at last: main shaft adjunction rimmer knife row, adopt the cutter bigger than main shaft diameter, get into endoporus and carry out being contoured of second interior circular arc;
The computational methods of the inwall of processing bend loss are: the size of known endoporus, center circular arc; With the α angle is the leucismus amount; Try to achieve axial depth H1 and center of arc to inboard, the outside, the sectional dimension L1 of center circular arc, L2, L0 according to the α angle; Go out the major axis Δ L1=L0-L1 of first sub-elliptical in prediction on such basis, the major axis Δ L2=L2-L0 of second sub-elliptical, the minor axis of sub-elliptical are the interior pore radius of pipeline; According to the size of different cross section, numerical control programming processes the sub-elliptical cross section, and the amount that control cross section the first half is crossed and cut, the latter half is cut less realizes the processing of bend loss endoporus in the scope that error allows.
The scope that the error of the amount that said cross section the first half is crossed and cut, the latter half is cut less allows is wall thickness ± 12.5%.
The processing of operation 2, bend loss outer wall;
The bend loss outer wall is an outer arc, adopts ball cutter adjunction rimmer knife row, and the processing of outer arc is realized in the outside of cutting workpiece.
The technique effect that the present invention can reach is:
The present invention adopts elongated axle semi-elliptical cross-section planet milling method; Carry out the processing of bend loss inwall, promptly from the oval cross section that changes, seek rule, and utilize this rule to carry out being contoured of bend pipe; Thereby realize the machined of bend pipe, be difficult to carry out mach problem thereby solve bend pipe.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:
Fig. 1 carries out mach machining area figure for adopting the present invention to first circular arc of bend pipe;
Fig. 2 is a schematic diagram calculation of the present invention;
Fig. 3 gets into the sketch map of bend pipe processing for cutter;
Fig. 4 is the sectional view that bend loss changes with α;
Fig. 5 is the comparison diagram of section line and standard ellipse line;
Fig. 6 is the error sketch map of cross section and standard ellipse line.
Description of reference numerals among the figure:
α is the diverse location of bend pipe and the angle of main shaft vertical direction,
H1 is the axial depth of bend pipe,
L1 is the sectional dimension of the center of arc of bend pipe to inner arc,
L2 is the sectional dimension of the center of arc of bend pipe to outer arc,
L0 is the sectional dimension of center of arc to the center circular arc of bend pipe,
Δ L1 is the major axis of first sub-elliptical,
Δ L2 is the major axis of second sub-elliptical.
The specific embodiment
The manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow of the present invention adopts Φ 200 horizontal digital-control boring-milling machines, and the cutter of lathe adopts the spreading blade row; It is Φ 785 that the present invention can be used to process internal diameter, and the short straight tube section is 1412mm, and long straight length is 2585.7mm, and the hot leg elbow that the bend loss angle is 56.4 ° is as shown in Figure 1;
The characteristics of Φ 200 horizontal digital-control boring-milling machine lathes are: the extending 1400mm of main shaft, the extending 1000mm of square ram, square ram circumscribed circle size Φ 546, the removable 1600mm of workbench.
Because the circular arc inboard is recessed inwards, the straight tube inwall is the extreme position of machine tool chief axis, so cutter must stretch out machine tool chief axis.
The distance that the definition cutter stretches out machine tool chief axis is Δ r, then:
The diameter of machine tool chief axis+2 Δs r＜bend pipe internal diameter
That is: Φ 200)+2 Δ r＜Φ 785
Can get Δ r=285mm, the radius of the blade row that promptly extends is 285mm.
Process may further comprise the steps:
The first step adopts the mode of boring and milling to process straight length; The boring-mill work mode is a prior art, does not give unnecessary details at this.
Second step, the processing bend loss;
The processing of operation 1, bend loss inwall;
Add man-hour, as shown in Figure 1, the mode of employing upside of ellipse and following semiellipse separate machined, the upside of ellipse of processing bend loss (being circular arc in first) earlier:
Cutter gets into the bend loss part along the direction of short straight tube section axial line, adopts main shaft adjunction rimmer knife row, is guaranteeing to be machined to 43.52 ° of maximum magnitudes earlier under the situation that main shaft and hole wall do not bump, and promptly the first area of first interior circular arc of short straight tube section one side 1.;
Guarantee that then main shaft and hole wall do not bump, keep the height of main shaft constant, be machined to maximum length, accomplish second area processing 2. short straight tube section one side circular arc in first;
Let cutter get into the bend loss part again, process remaining first circular arc along the direction of long straight length axial line, completion to the 3rd zone of long straight length one side circular arc in first 3., the processing 4. of the 4th zone;
Process the following semiellipse (being circular arc in second) of bend loss at last:
Main shaft adjunction rimmer knife row adopts the cutter bigger than main shaft diameter, gets into endoporus and carries out being contoured of second interior circular arc;
As shown in Figure 2; The size of known endoporus, center circular arc (confirming) according to designing requirement; With the α angle is the leucismus amount; Axial depth H1 and center of arc to inboard, the outside, the sectional dimension L1 of center circular arc, L2, L0 can be tried to achieve according to the α angle, the major axis Δ L1=L0-L1 of first sub-elliptical can be extrapolated with this, the major axis Δ L2=L2-L0 of second sub-elliptical.According to the size of different cross section, numerical control programming can process approximate oval cross section, realizes the processing of bend loss endoporus.
The principle of this processing method is following:
As shown in Figure 2; Bend pipe is along the ring section of all cross sections for equating of R1429.3 arc radius direction; Process this profile; The R1429.3 circular arc line moves and is vertical with the radial direction normal direction along the bend pipe center must to make machine tool chief axis, but because the restriction in duct length and aperture, this can't realize.The present invention adopts elongated axle semi-elliptical cross-section planet milling method; Carry out the processing of bend loss inwall, promptly from the oval cross section that changes, seek rule, and utilize this rule to carry out being contoured of bend pipe; Thereby realize the machined of bend pipe, be difficult to carry out mach problem thereby solve bend pipe.
As shown in Figure 3, cutter gets into bent tube section along the direction of straight length axial line, and the shape face that is intercepted according to bend pipe and main shaft vertical direction diverse location α angle is a duck's egg shape, and shown in Fig. 4 a to Fig. 4 g, the α angle is big more, and the length of duck's egg shape is long more;
Utilize standard ellipse to be similar to this duck's egg tee section; The length computation long axis of ellipse of the duck's egg tee section that intercepts according to different α angle; Same cross section is similar to the standard ellipse that two major axis do not wait; Guarantee upside of ellipse and semielliptical center down all on the R1429.3 center line, utilize mathematical relationship to calculate automatically to isolate semiellipse major semiaxis data up and down, promptly the upside of ellipse major axis be interior camber line (R1036.8) to the center (R1429.3) size, second long axis of ellipse be outer camber line (R1821.8) to the center (R1429.3) size; And that minor axis is in the pipeline hole dimension 392.5 (Φ 785/2) is constant, shown in Fig. 5 a to Fig. 5 g.
Can be known that by Fig. 6 a to Fig. 6 g along with the increase of α angle, the error of standard ellipse and actual cross-section is increasing in wanting the range of work, cuts so cross section the first half is crossed, the latter half is cut less.
Through the control ellipticity error within the range of permission, calculate machinable maximum magnitude, because of the range of work about 56.4 ° of angular bisector symmetries, so be machined to maximum magnitude as far as possible from short section, maximum length is to reduce the amount that long section is processed.According to designing requirement bend wall thickness is theoretical wall thickness ± 12.5%, existing minimum wall thickness (MINI W.) value 75mm calculating to allow, promptly ± and 9.375mm, know that by sectional view can first circular arc be machined to about 50 °, second circular arc is machined to 90 ° nearly
The processing of operation 2, bend loss outer wall;
The bend loss outer wall is an outer arc, adopts ball cutter adjunction rimmer knife row, and the processing of outer arc is realized in the outside of cutting workpiece.The processing of outer arc adopts existing machine-tooled method to realize.
Claims (3)
1. the manufacturing approach of an AP1000 main nuclear power pipeline hot leg elbow is characterized in that: adopt horizontal digital-control boring-milling machine, the cutter of lathe adopts the spreading blade row, and processing comprises the bend pipe of short straight tube section, long straight length, bend loss, and process may further comprise the steps:
The first step adopts the mode of boring and milling to process straight length;
Second step, the processing bend loss;
The mode of operation 1, employing upside of ellipse and following semiellipse separate machined, the inwall of processing bend loss;
Process the upside of ellipse of bend loss earlier: cutter gets into the bend loss part along the direction of short straight tube section axial line, adopts main shaft adjunction rimmer knife row, is guaranteeing under the situation that main shaft and hole wall do not bump the first area of circular arc in first of elder generation's processing short straight tube section one side;
Guarantee that then main shaft and hole wall do not bump, keep the height of main shaft constant, be machined to maximum length, accomplish processing short straight tube section one side second area of circular arc in first;
Let cutter get into the bend loss part again, process remaining first circular arc along the direction of long straight length axial line, accomplish to long straight length one side in first circular arc the 3rd, four-range processes;
Process the following semiellipse of bend loss at last: main shaft adjunction rimmer knife row, adopt the cutter bigger than main shaft diameter, get into endoporus and carry out being contoured of second interior circular arc;
The processing of operation 2, bend loss outer wall:
The bend loss outer wall is an outer arc, adopts ball cutter adjunction rimmer knife row, and the processing of outer arc is realized in the outside of cutting workpiece.
2. the manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow according to claim 1; It is characterized in that: the computational methods of the inwall of said operation 1 processing bend loss are: the size of known endoporus, center circular arc; With the α angle is independent variable; Try to achieve axial depth H1 and center of arc to inboard, the outside, the sectional dimension L1 of center circular arc, L2, L0 according to the α angle; Go out the major axis Δ L1=L0-L1 of first sub-elliptical in prediction on such basis, the major axis Δ L2=L2-L0 of second sub-elliptical, the minor axis of sub-elliptical are the interior pore radius of pipeline; According to the size of different cross section, numerical control programming processes the sub-elliptical cross section, and the amount that control cross section the first half is crossed and cut, the latter half is cut less realizes the processing of bend loss endoporus in the scope that error allows.
3. the manufacturing approach of AP1000 main nuclear power pipeline hot leg elbow according to claim 2 is characterized in that: the scope that the error of the amount that said cross section the first half is crossed and cut, the latter half is cut less allows is wall thickness ± 12.5%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103028893A (en) * | 2012-11-30 | 2013-04-10 | 苏州市意可机电有限公司 | Circular light tube processing technology |
| CN103862225A (en) * | 2012-12-14 | 2014-06-18 | 上海重型机器厂有限公司 | Processing method for inner hole of elbow of nuclear power main pipeline |
| CN105499671A (en) * | 2015-12-30 | 2016-04-20 | 天津重型装备工程研究有限公司 | Triaxial numerical control milling method for inner surface of bending pipe |
| CN109187864A (en) * | 2018-09-06 | 2019-01-11 | 苏州热工研究院有限公司 | Used in nuclear power station forges main pipeline manufacturing process assessment method |
| CN110014267A (en) * | 2019-03-28 | 2019-07-16 | 二重（德阳）重型装备有限公司 | Large-scale bend pipe processing method |
| CN110509002A (en) * | 2019-05-31 | 2019-11-29 | 东方电气集团东方锅炉股份有限公司 | The processing technology of pipe fitting on circular ring shape bend pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103028893A (en) * | 2012-11-30 | 2013-04-10 | 苏州市意可机电有限公司 | Circular light tube processing technology |
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| CN109187864A (en) * | 2018-09-06 | 2019-01-11 | 苏州热工研究院有限公司 | Used in nuclear power station forges main pipeline manufacturing process assessment method |
| CN109187864B (en) * | 2018-09-06 | 2021-02-26 | 苏州热工研究院有限公司 | Method for evaluating manufacturing process of forged main pipeline for nuclear power station |
| CN110014267A (en) * | 2019-03-28 | 2019-07-16 | 二重（德阳）重型装备有限公司 | Large-scale bend pipe processing method |
| CN110014267B (en) * | 2019-03-28 | 2020-06-23 | 二重（德阳）重型装备有限公司 | Large-scale bent pipe machining method |
| CN110509002A (en) * | 2019-05-31 | 2019-11-29 | 东方电气集团东方锅炉股份有限公司 | The processing technology of pipe fitting on circular ring shape bend pipe |
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Effective date of registration: 20161130 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |