CN101812572B - Vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump - Google Patents
Vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump Download PDFInfo
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- CN101812572B CN101812572B CN2010101412354A CN201010141235A CN101812572B CN 101812572 B CN101812572 B CN 101812572B CN 2010101412354 A CN2010101412354 A CN 2010101412354A CN 201010141235 A CN201010141235 A CN 201010141235A CN 101812572 B CN101812572 B CN 101812572B
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Abstract
The invention discloses a vacuum heat expansion forming process of a rotor shielding sleeve of a nuclear main pump, which is mainly used for shaping the rotor shielding sleeve of the nuclear main pump and belongs to the field of nuclear power. The rotor shielding sleeve is sleeved outside a die at normal temperature; the rotor shielding sleeve and the die are placed in a vacuum heat treatment furnace; and with the rise of the temperature, since a linear expansion coefficient of the die is larger than a linear expansion coefficient of the rotor shielding sleeve, the rotor shielding sleeve is subjected to heat expansion force action of the die to generate plastic deformation. In the heat-preservation stage, the stress of the rotor shielding sleeve is reduced and creep deformation occurs according to the stress relaxation principle. When the rotor shielding sleeve and the die are cooled to room temperature, the plastic deformation and the creep deformation of the rotor shielding sleeve can be retained, thereby achieving the shaping aim. On one hand, the invention can ensure the forming precision and the roundness of the rotor shielding sleeve and the forming quality of the rotor shielding sleeve is stable; and on the other hand, the invention simplifies the production process flow, reduces the production cost and saves the production cost.
Description
Technical field
The present invention relates to a kind of vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump, be mainly used in the orthopedic of rotor shielding sleeve of nuclear main pump, belong to the nuclear power field.
Background technology
The nuclear main pump is unique rotating equipment in Nuclear power plants one circuit system, is the heart of nuclear island, belongs to Nuclear safety one-level equipment, is one of key equipment of pressurized-water reactor nuclear power plant.For the non-active nuclear reactor of the third generation, what it adopted is a kind of canned-motor pump with shield electric machine, motor in the pump is vertical, water-cooled, cage type induction motor, the outside surface of rotor is with rotor shielding sleeve, rotor shielding sleeve can prevent that rotor bar from contacting with reactor coolant, its processing and assembly quality directly influence the normal operation of nuclear main pump, are one of key parts in the nuclear main pump.
The corrosion resistant non-magnetic metal Hastelloy of the material selection of rotor shielding sleeve C-276 alloy, its complete processing are divided into blanking shearing, roll bending shaping, welding, orthopedic and assemble several operations.Wherein, after finishing weldprocedure, because the forming accuracy and the roundness of rotor shielding sleeve are difficult to reach design requirements, need carry out orthopedic this moment to rotor shielding sleeve, makes its forming accuracy that meets the demands and roundness, for next step packaging technology is prepared.This also is a very important operation in the processing of rotor shielding sleeve and the assembling process.
Bulging is a kind of special metal forming working method, is widely used in fields such as aerospace, automotive industry.Usually the bulging of workpiece is to rely on high internal pressure and thrust load to control shaping by mould, belongs to the cold shaping category.
Rotor shielding sleeve of nuclear main pump has ultra-thin big L/D ratio, and the dimensional precision and the roundness height that require, the shaping difficulty is very big, orthopedicly has a following drawback with what above-mentioned traditional expanding method was used for rotor shielding sleeve of nuclear main pump: at first, the resilience of workpiece is bigger behind the bulging, and it is unstable to be shaped; Secondly, the bigger unrelieved stress of the inner existence of workpiece behind the bulging, need eliminate the unrelieved stress of workpiece inside this moment by annealing, and workpiece is met design requirement; Moreover whole process not only needs special former, and need be specifically designed to the annealed Equipment for Heating Processing, the technical process complexity, and the production cost height, and efficient is low.
Summary of the invention
The vacuum heat expansion forming process that the purpose of this invention is to provide a kind of rotor shielding sleeve of nuclear main pump, can realize the orthopedic of rotor shielding sleeve of nuclear main pump, the present invention not only can guarantee the forming accuracy and the roundness of rotor shielding sleeve, the forming quality of rotor shielding sleeve is stable, and simplified the technological process of production, reduce production cost, improved production efficiency.
Technical solution of the present invention is: a kind of vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump is divided into the cold four-stage of room temperature shove charge, heating, insulation and stove:
Described room temperature shove charge is meant at room temperature, rotor shielding sleeve and mould are together put into vacuum heat treatment furnace, mould places on the filler platform, rotor shielding sleeve is enclosed within the outside of mould, and seat is on the boss of mould, leave certain bulging gap between the internal diameter of rotor shielding sleeve and the external diameter of mould, and the axis of rotor shielding sleeve, mould and filler platform is positioned on same the medullary ray.
Described heating is meant and utilizes vacuum heat treatment furnace to give rotor shielding sleeve and mold heated, rising along with temperature, rotor shielding sleeve and mould generation thermal expansion, because the linear expansivity of mould is greater than the linear expansivity of rotor shielding sleeve, when being heated to a certain moment, rotor shielding sleeve and mould can fit together fully, that is: the external diameter of the internal diameter of rotor shielding sleeve and mould overlaps, the bulging gap disappears, at this moment, rotor shielding sleeve and mould will expand together, and viscous deformation takes place under the effect of mold hot bulging force rotor shielding sleeve gradually.
Described insulation is that rotor shielding sleeve and mold heated are incubated for some time after holding temperature, and at this moment, rotor shielding sleeve and mould no longer expand, and according to the stress relaxation principle, the stress of rotor shielding sleeve inside reduces, and creep strain takes place gradually.
Described stove is cold to be meant through after fully being incubated, rotor shielding sleeve and mould are at the vacuum heat treatment furnace internal cooling, rotor shielding sleeve and mould Yin Wendu reduce and shrink, because the linear expansivity of mould is greater than the linear expansivity of rotor shielding sleeve, at a time, rotor shielding sleeve and mold separation are when cool to room temperature, the viscous deformation and the creep strain of rotor shielding sleeve just keep getting off, thereby reach the purpose of shaping.
The size range of described rotor shielding sleeve: highly be 1000mm-4000mm, internal diameter is 200mm-800mm, and thickness is 0.3mm-1.0mm.
Described mould is the cylinder that a lower end has boss, adopts the manufacturing of 1Cr18Ni9Ti stainless steel.
The size of described bulging gap, holding temperature, soaking time and mould is the important technical parameter of the vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump, directly influence the final shaping of rotor shielding sleeve of nuclear main pump, utilize finite element software MSC.MARC and numerical evaluation software Fortran to set up the vacuum heat expansion forming of finite element model simulation rotor shielding sleeve of nuclear main pump, and according to the dimensional precision and the roundness requirement of reality, continue to optimize process program, finally select reasonable technological parameter.
The beneficial effect that the present invention reached is: the vacuum heat expansion forming process of this rotor shielding sleeve of nuclear main pump can be finished the orthopedic of rotor shielding sleeve of nuclear main pump.Because whole technology is to carry out in vacuum heat treatment furnace, have non-oxidation, no decarburization, surface smoothness is good, distortion is little, advantage such as energy-conservation and pollution-free, and rotor shielding sleeve of nuclear main pump is to form simultaneously at the vacuum heat treatment annealed, so one aspect of the present invention can guarantee the forming accuracy and the roundness of rotor shielding sleeve, and eliminated the unrelieved stress that rotor shielding sleeve produces in welding process, prevent that rotor shielding sleeve from cracking when being shaped, the forming quality of rotor shielding sleeve is stable; To be shaped on the other hand organically blends with annealing, has simplified the technological process of production, and has not needed to make special former, has reduced production cost, has improved production efficiency.
Description of drawings
The present invention is further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the vacuum heat expansion forming device synoptic diagram of rotor shielding sleeve of nuclear main pump.
Fig. 2 is the shape and the relative position synoptic diagram of vacuum heat expansion forming process rotor bell housing and mould.
Fig. 3 is the cross-sectional view of A-A among Fig. 2.
Fig. 4 is the vacuum heat expansion forming process figure of rotor shielding sleeve of nuclear main pump.
Among the figure: 1. vacuum heat treatment furnace, 2. mould, 3. rotor shielding sleeve, 4. filler platform
Embodiment
Among Fig. 1, Fig. 2 and Fig. 3, rotor shielding sleeve 3 is enclosed within the outside of mould 2, and seat is on the boss of mould 2, and both are placed on the filler platform 4 in the vacuum heat treatment furnace 1 together, and the axis of rotor shielding sleeve 3, mould 2 and filler platform 4 is positioned on same the medullary ray.
Fig. 4 shows the vacuum heat expansion forming process figure of rotor shielding sleeve of nuclear main pump.Technology is divided into the room temperature shove charge, heating, insulation and the cold four-stage of stove.
Described device above using, and, realize the orthopedic of rotor shielding sleeve of nuclear main pump 3 according to the vacuum heat expansion forming process of above-mentioned rotor shielding sleeve of nuclear main pump 3, concrete operations are as follows:
At first, at room temperature rotor shielding sleeve 3 is enclosed within the outside of mould 2, seat is on the boss of mould 2, again rotor shielding sleeve 3 and mould 2 are placed on together on the filler platform 4 in the vacuum heat treatment furnace 1, and, the axis of rotor shielding sleeve 3, mould 2 and filler platform 4 is positioned on same the medullary ray by adjusting the position of rotor shielding sleeve 3 and mould 2.
Then, utilize vacuum heat treatment furnace 1 to give rotor shielding sleeve 3 and mould 2 heating, after reaching holding temperature, enter holding stage, insulation for some time.
At last, rotor shielding sleeve 3 and mould 2 one vacuum heat treatment furnace 1 internal cooling that coexists is come out of the stove to room temperature, has finished the orthopedic of rotor shielding sleeve of nuclear main pump 3.
Claims (2)
1. the vacuum heat expansion forming process of a rotor shielding sleeve of nuclear main pump is divided into the cold four-stage of room temperature shove charge, heating, insulation and stove, it is characterized in that:
At first, at room temperature, rotor shielding sleeve (3) and mould (2) are together put into vacuum heat treatment furnace (1), mould (2) places on the filler platform (4), rotor shielding sleeve (3) is enclosed within the outside of mould (2), and be sitting on the boss of mould (2), leave certain bulging gap between the external diameter of the internal diameter of rotor shielding sleeve (3) and mould (2), and the axis of rotor shielding sleeve (3), mould (2) and filler platform (4) is positioned on same the medullary ray; Described mould (2) is the cylinder that a lower end has boss, adopts the manufacturing of 1Cr18Ni9Ti stainless steel;
Then, utilize vacuum heat treatment furnace (1) to give rotor shielding sleeve (3) and mould (2) heating, when reaching holding temperature, insulation for some time;
At last, rotor shielding sleeve (3) and mould (2) at vacuum heat treatment furnace (1) internal cooling to room temperature.
2. the vacuum heat expansion forming process of a kind of rotor shielding sleeve of nuclear main pump according to claim 1 is characterized in that: the size range of described rotor shielding sleeve (3): highly be 1000mm-4000mm, internal diameter is 200mm-800mm, and thickness is 0.3mm-1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101412354A CN101812572B (en) | 2010-04-03 | 2010-04-03 | Vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101412354A CN101812572B (en) | 2010-04-03 | 2010-04-03 | Vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump |
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| Publication Number | Publication Date |
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| CN101812572A CN101812572A (en) | 2010-08-25 |
| CN101812572B true CN101812572B (en) | 2011-08-31 |
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| CN2010101412354A Active CN101812572B (en) | 2010-04-03 | 2010-04-03 | Vacuum heat expansion forming process of rotor shielding sleeve of nuclear main pump |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356688A (en) * | 2015-11-22 | 2016-02-24 | 大连理工大学 | Apparatus and method for prolonging time of heating assembling of rotor shielding sleeve of nuclear main pump |
| TWI614084B (en) * | 2016-09-01 | 2018-02-11 | Shaft core heat sealing machine and heat sealing method thereof | |
| CN111690893A (en) * | 2020-06-16 | 2020-09-22 | 大连理工大学 | Machining method for improving structural integrity of idling flywheel of nuclear main pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1068400A (en) * | 1991-07-09 | 1993-01-27 | 北京市西城区新开通用试验厂 | Numerically-controlled flooding booster pump |
| KR100584836B1 (en) * | 2003-07-19 | 2006-05-30 | 한국전력기술 주식회사 | Feedwater Control System in Nuclear Power Plant Considering Feedwater Control Valve Pressure Drop and Control Method thereof |
| CN101448383B (en) * | 2007-11-27 | 2012-08-08 | 沈阳工业大学 | Shield cover structure |
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