CN114434110B - Technological method for simultaneously processing and assembling main shaft seal system of nuclear power station - Google Patents
Technological method for simultaneously processing and assembling main shaft seal system of nuclear power station Download PDFInfo
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- CN114434110B CN114434110B CN202210223490.6A CN202210223490A CN114434110B CN 114434110 B CN114434110 B CN 114434110B CN 202210223490 A CN202210223490 A CN 202210223490A CN 114434110 B CN114434110 B CN 114434110B
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- intermediate shaft
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- upper half
- stretching
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008878 coupling Effects 0.000 claims abstract description 53
- 238000010168 coupling process Methods 0.000 claims abstract description 53
- 238000005859 coupling reaction Methods 0.000 claims abstract description 53
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 238000003754 machining Methods 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
Abstract
The invention relates to a process method for synchronously processing and assembling a main shaft system of a shaft seal of a nuclear power station, which is characterized in that a shaft system which is qualified in runout inspection is assembled with an upper half coupling (1) and an intermediate shaft (2) and a lower half coupling (3) and the intermediate shaft (2) in a bolt stretching mode, bolts (6) are stretched, nuts (7) are fastened, the bolts are horizontally placed on a support (8), and four radial positioning pin holes (9) of the upper half coupling (1) and the intermediate shaft (2) and four radial positioning pin holes (9) of the lower half coupling (3) and the intermediate shaft (2) are processed respectively in the sequence of boring and reaming. The invention improves the precision and reduces the cost, and the whole processing is adopted to greatly improve the efficiency, thus obtaining huge technological innovation compared with the prior technological method, being successfully applied to the product manufacturing process, having high efficiency and creating huge benefit.
Description
Technical field:
the invention relates to a process method for simultaneously processing and assembling a main shaft system of a shaft seal of a nuclear power station.
The background technology is as follows:
the technical method for simultaneously processing and assembling the shaft system of the main shaft seal of the nuclear power station is a key for normal operation of the main shaft system of the main shaft seal of the nuclear power station, and the vibration value of the main shaft is influenced by the shaft system simultaneous processing precision and the diameter of the assembling method. Excessive vibration values can cause that a nuclear main pump cannot normally operate or a nuclear power station is shut down, and serious accidents can occur. The processing and assembling of the main shaft seal system of the nuclear power station is particularly important for localization of the main shaft seal pump. The simultaneous processing and assembly of the shaft seal main pump shafting of the nuclear power station is always an international technical problem and is a key technology for manufacturing the nuclear main pump. The prior art has the following defects that firstly, an integral reamer is adopted to process a positioning pin hole (9), the machining resistance of the integral reamer is high, the service life of a machine tool is influenced, chip removal is difficult, the roughness and the dimensional accuracy of the surface of a reaming hole are influenced, the condition that the machining of parts is disqualified and is scrapped is possibly caused, once the integral reamer is damaged, the whole cutter body is scrapped, the cutter cost is increased, the second prior art processes the positioning pin hole (9), the positioning pin (10) is in an axial direction, when the positioning pin (10) passes through a coupler and two parts of an intermediate shaft (2), the gap is small, the assembly is difficult, the situation of grinding damage is frequently caused, the cylindrical pin cannot be removed due to the tiny deformation caused by the shearing force applied to the cylindrical pin after the operation, the intermediate shaft (2) and the coupler are scrapped, particularly when the disassembly is difficult under the condition that the disassembly is generated, the working time of a worker is increased when the working condition with radiation is generated in a nuclear power station, the torque bolt is only moment, the nut and the intermediate shaft (2) can be relatively damaged due to the large moment when the large moment is used, the spanner is relatively damaged, the conventional spanner cannot be removed due to the fact that the friction force is relatively large, the surface of the intermediate shaft is damaged, the spanner cannot be removed when the conventional spanner is relatively damaged, and the conventional spanner cannot be removed due to the fact that the conventional technology is relatively large, the conventional spanner is not can be removed, in the fifth prior art, the positioning pin holes (9) of the lower half coupling (3) and the intermediate shaft (2) are machined respectively in a sectional mode, the upper half coupling (1) and the positioning pin holes (9) of the intermediate shaft (2) are machined simultaneously after the integral assembly runout inspection is qualified, multiple assembly and inspection are needed, and the risk of damage due to grinding and the cost of disassembly are increased.
The invention comprises the following steps:
the invention aims to disclose a process method for simultaneously processing and assembling a main shaft system of a shaft seal of a nuclear power station with high precision and high adjustment efficiency. The technical scheme of the invention is as follows: a main shaft system of a shaft seal of a nuclear power station is assembled on an upper half shaft coupling (1) and a middle shaft (2) in a bolt stretching mode, nuts (7) are fastened after assembly, bolts (6) of the lower half shaft coupling (3) and the middle shaft (2) are stretched, the nuts (7) are fastened, the main shaft system is laid on a support, four radial positioning pin holes (9) of the upper half shaft coupling (1) and the middle shaft are machined by adopting drilling and boring sequences, the four radial positioning pin holes (9) of the lower half shaft coupling (3) and the middle shaft are machined by adopting the reaming sequences, positioning pin holes (9) are measured, positioning pins (10) are prepared one by one according to the measured size, the upper half shaft coupling (1) and the middle shaft (2) are disassembled, the positioning pins (10) are assembled, and then assembly is carried out: the method comprises the following steps: 1) assembling an upper half coupler (1) and an intermediate shaft (2), a lower half coupler (3), a lower pump shaft (4) and an impeller (5) of a finished shafting runout checking component, stretching bolts (6) of the lower half coupler (3) and the intermediate shaft (2), fastening nuts (7) by using a stretching pretightening force of 121 kilonewtons, stretching bolts (6) of the upper half coupler (1) and the intermediate shaft (2), and fastening nuts (7) by using a stretching pretightening force of 121 kilonewtons;
2) The shafting components of the assembled upper half coupling (1), the middle shaft (2), the lower half coupling (3), the lower pump shaft (4) and the impeller (5) are horizontally placed on a bracket (8) and fixed;
3) Four radial positioning pin holes (9) are machined on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by adopting a drill bit with the diameter of 24mm, the depth is 102.5mm, each positioning pin hole forms an angle of 90 degrees with each other, and machining parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30mm/min;
4) Boring is carried out on a radial positioning pin hole (9) which is drilled on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by adopting a boring cutter, the positioning pin hole (9) is processed to a diameter of 24.8mm, the depth is 93.5mm, and the processing parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40mm/min;
5) The method comprises the steps of reaming a positioning pin hole (9) which is subjected to boring processing and radial and is positioned on the joint surface of a lower coupling (3) and a middle shaft (2) by adopting a replaceable reamer, wherein the positioning pin hole (9) is processed to a diameter of 25H7mm, the depth is 93.5mm, the roughness is Ra1.6mu m, and the processing parameters are as follows: the rotating speed is 50r/min, and the feeding speed is 15mm/min;
6) Machining four radial positioning pin holes (9) on the joint surface of the upper half coupler (1) and the intermediate shaft (2) according to the processes of the steps 3), 4) and 5):
7) Marking each positioning pin hole (9) by adopting natural numbers of 1-8;
8) Measuring the machining size of each positioning pin hole (9) and recording according to the mark;
8) 8 positioning pins (10) are matched and processed according to a clearance of 0.01 mm;
9) Stretching a bolt (6) of the upper half coupler (1) and the intermediate shaft (2), wherein the stretching force of the bolt (6) is 121 kilonewtons, removing a nut (7), the bolt (6) and the upper half coupler (1), stretching the bolt (6) of the lower half coupler (3) and the intermediate shaft (2), the stretching pretightening force of the bolt (6) is 127 kilonewtons, and removing the nut (7), the intermediate shaft (2) and the bolt (6);
10 Four cylindrical pins (10) are arranged in the positioning pin holes (9) of the corresponding lower half coupling (3), the intermediate shaft (2) is assembled, bolts (6) of the lower half coupling (3) and the intermediate shaft (2) are arranged in the lower half coupling, the bolts (6) are stretched, the stretching pretightening force of the bolts (6) is 121 kilonewtons, and the nuts (7) are fastened;
11 Corresponding cylindrical pins (10) are arranged in positioning pin holes (9) of the intermediate shaft (2) and the upper half coupling (1), the upper half coupling (1) is assembled, bolts (6) of the upper half coupling (1) and the intermediate shaft (2) are arranged, the bolts (6) are stretched, the stretching pretightening force 121 of the bolts (6) is applied, and the nuts (7) are fastened.
The invention has the technical effects that:
according to the invention, the inventive main pump shafting positioning pin hole (9) adopts radial processing, adopts a head-replaceable reamer, and adopts a bolt stretching mode to fasten the shafting coupler and the intermediate shaft (2). The process method has the advantages that: firstly, the adopted replaceable reamer machining positioning pin hole (9) is smaller than that of an integral hard alloy reamer, the resistance of the replaceable reamer machine tool is reduced, the precision is ensured, a sufficient chip containing space is provided, the processed surface is prevented from being damaged by the iron chips, a better surface rough and ultra degree can be obtained, a modular structure is realized, the cutter heads are replaceable, the same cutter bar can be provided with reamer heads with different diameters, the cost and the inventory are reduced, secondly, the positioning pin (10) is provided with half of the positioning pin holes (9) respectively between the coupler and the intermediate shaft (2), as shown in figure 2, the coupler and the intermediate shaft (2) are disassembled during disassembly to disassemble the positioning pin (10), the radial positioning pin hole (9) can not be damaged by grinding and can not be disassembled relative to the axial positioning pin hole (9), the situation that the positioning pin (10) is difficult to disassemble due to too small clearance is avoided, the positioning precision of the radial positioning pin (10) relative to the axial positioning pin (10) is increased, the situation that the shaft coupling is damaged by grinding bolts only through the mode of stretching bolts is avoided, the situation that the workpiece can be disassembled only through the damage caused by grinding the bolts and the damage caused by grinding the positioning pin (10) is avoided, the precision is influenced by the fact that the shaft coupling and the intermediate shaft (2) are assembled through the mode of stretching bolts without displacement caused by the fact that the intermediate shaft (2) and the shaft coupling are not processed by the positioning pin (10), the sixth is that the shaft system assembled in a positioning and stretching way through the radial positioning pin (10) can be used for integrally and once processing the positioning pin holes (9) of the upper half coupler (1) and the middle shaft (2) and the positioning pin holes (9) of the lower half coupler (3) and the middle shaft (2), compared with the split joint processing, the efficiency is improved, the cost is reduced, the assembly times are reduced, the collision risk caused by assembly is reduced, and the time of assembly and disassembly under the radiation working condition is greatly shortened when the method is overhauled, so that the situation that the disassembly cannot be realized due to grinding damage possibly generated when overhauling is avoided.
Description of the drawings:
FIG. 1 is a schematic view of shafting components in the same processing state
FIG. 2 is a schematic diagram of the positions of the intermediate shaft (2), the lower coupling (3) and the cylindrical pin
The specific embodiment is as follows:
as shown in fig. 1, a main shaft seal shaft system of a nuclear power station is assembled on an upper half shaft coupling 1 and an intermediate shaft 2 in a bolt stretching mode, nuts 7 are fastened after assembly, bolts 6 of the lower half shaft coupling 3 and the intermediate shaft 2 are stretched, the nuts 7 are fastened, the main shaft seal shaft system is horizontally placed on a support, four radial positioning pin holes 9 of the upper half shaft coupling 1 and the intermediate shaft are machined by adopting drilling, boring and reaming sequences, the four radial positioning pin holes 9 of the lower half shaft coupling 3 and the intermediate shaft 2 are machined, positioning pin holes 9 are measured, positioning pins 10 are prepared one by one according to the measured size, the upper half shaft coupling 1 and the intermediate shaft 2 are disassembled, the positioning pins 10 are assembled, and then the assembly is carried out: the method comprises the following steps: 1) Assembling an upper half coupler 1, an intermediate shaft 2, a lower half coupler 3, a lower pump shaft 4 and an impeller 5 of the shafting runout checking component, stretching a bolt 6 of the lower half coupler 3 and the intermediate shaft 2, wherein the stretching pretightening force of the bolt 6 is 121 kilonewtons, fastening a nut 7, stretching the bolt 6 of the upper half coupler 1 and the intermediate shaft 2, and the stretching pretightening force of the bolt 6 is 121 kilonewtons, and fastening the nut 7;
2) The assembled shafting components of the upper half coupling 1, the middle shaft 2, the lower half coupling 3, the lower pump shaft 4 and the impeller 5 are horizontally placed on a bracket 8 and fixed;
3) Four radial positioning pin holes 9 are machined on the joint surface of the lower half coupler 3 and the intermediate shaft 2 by adopting a drill bit with the diameter of 24mm, the depth is 102.5mm, each positioning pin hole forms an angle of 90 degrees with each other, and the machining parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30mm/min;
4) Boring is carried out on the radial positioning pin hole 9 which is drilled on the joint surface of the lower half coupling 3 and the intermediate shaft 2 by adopting a boring cutter, the positioning pin hole 9 is processed to be 24.8mm in diameter, the depth is 93.5mm, and the processing parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40mm/min;
5) As shown in fig. 2, the positioning pin hole 9 which is subjected to boring radial processing and is positioned on the joint surface of the lower half coupling 3 and the middle shaft 2 is subjected to reaming processing by adopting a replaceable reamer, the positioning pin hole 9 is processed to a diameter of 25H7mm, the depth is 93.5mm, the roughness is Ra1.6 μm, and the processing parameters are as follows: the rotating speed is 50r/min, and the feeding speed is 15mm/min;
6) Machining radial four positioning pin holes 9 on the joint surface of the upper half coupler 1 and the intermediate shaft 2 according to the process of the steps 3), 4) and 5):
7) Marking each positioning pin hole 9 by adopting natural numbers of 1-8;
8) Measuring the machining size of each positioning pin hole 9 and making records according to the marks;
8) 8 positioning pins 10 are matched and processed according to a clearance of 0.01 mm;
9) The bolt 6 of the upper half coupling 1 and the intermediate shaft 2 is stretched, the stretching force of the bolt 6 is 121 kilonewtons, the nut 7, the bolt 6 and the upper half coupling 1 are removed, the bolt 6 of the lower half coupling 3 and the intermediate shaft 2 is stretched, the stretching pretightening force of the bolt 6 is 127 kilonewtons, and the nut 7, the intermediate shaft 2 and the bolt 6 are removed;
10 Four cylindrical pins 10 are installed in the positioning pin holes 9 of the corresponding lower half coupling 3, the intermediate shaft 2 is assembled, the bolts 6 of the lower half coupling 3 and the intermediate shaft 2 are installed, the bolts 6 are stretched, the stretching pretightening force of the bolts 6 is 121 kilonewtons, and the nuts 7 are fastened;
11 Corresponding cylindrical pins 10 are installed in the positioning pin holes 9 of the intermediate shaft 2 and the upper half coupling 1, the upper half coupling 1 is assembled, the bolts 6 of the upper half coupling 1 and the intermediate shaft 2 are installed, the bolts 6 are stretched, and the stretching pretightening force 121 of the bolts 6 is applied to fasten the nuts 7.
Claims (1)
1. A process method for simultaneously processing and assembling a main shaft system of a shaft seal of a nuclear power station is characterized by comprising the following steps: the shaft system after qualified jumping inspection is assembled on the upper half coupler (1) and the intermediate shaft (2) in a bolt stretching mode, nuts (7) are fastened after assembly, bolts (6) of the lower half coupler (3) and the intermediate shaft (2) are stretched, the nuts (7) are fastened, the shaft system is laid on a support, four radial positioning pin holes (9) of the upper half coupler (1) and the intermediate shaft are machined in sequence by adopting drilling holes and boring holes, the four radial positioning pin holes (9) of the lower half coupler (3) and the intermediate shaft (2) are machined, positioning pin holes (9) are measured, positioning pins (10) are prepared one by one according to the measured size, the upper half coupler (1) and the intermediate shaft (2) are disassembled, the positioning pins (10) are assembled, and then the assembly is carried out: the method comprises the following steps: 1) assembling an upper half coupler (1) and an intermediate shaft (2), a lower half coupler (3), a lower pump shaft (4) and an impeller (5) of a finished shafting runout checking component, stretching bolts (6) of the lower half coupler (3) and the intermediate shaft (2), fastening nuts (7) by using a stretching pretightening force of 121 kilonewtons, stretching bolts (6) of the upper half coupler (1) and the intermediate shaft (2), and fastening nuts (7) by using a stretching pretightening force of 121 kilonewtons;
2) The shafting components of the assembled upper half coupling (1), the middle shaft (2), the lower half coupling (3), the lower pump shaft (4) and the impeller (5) are horizontally placed on a bracket (8) and fixed;
3) Four radial positioning pin holes (9) are machined on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by adopting a drill bit with the diameter of 24mm, the depth is 102.5mm, each positioning pin hole forms an angle of 90 degrees with each other, and machining parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30mm/min;
4) Boring is carried out on a radial positioning pin hole (9) which is drilled on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by adopting a boring cutter, the positioning pin hole (9) is processed to a diameter of 24.8mm, the depth is 93.5mm, and the processing parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40mm/min;
5) The method comprises the steps of reaming a positioning pin hole (9) which is subjected to boring processing and radial and is positioned on the joint surface of a lower coupling (3) and a middle shaft (2) by adopting a replaceable reamer, wherein the positioning pin hole (9) is processed to a diameter of 25H7mm, the depth is 93.5mm, the roughness is Ra1.6mu m, and the processing parameters are as follows: the rotating speed is 50r/min, and the feeding speed is 15mm/min;
6) Machining four radial positioning pin holes (9) on the joint surface of the upper half coupler (1) and the intermediate shaft (2) according to the processes of the steps 3), 4) and 5):
7) Marking each positioning pin hole (9) by adopting natural numbers of 1-8;
8) Measuring the machining size of each positioning pin hole (9) and recording according to the mark;
8) 8 positioning pins (10) are matched and processed according to a clearance of 0.01 mm;
9) Stretching a bolt (6) of the upper half coupler (1) and the intermediate shaft (2), wherein the stretching force of the bolt (6) is 121 kilonewtons, removing a nut (7), the bolt (6) and the upper half coupler (1), stretching the bolt (6) of the lower half coupler (3) and the intermediate shaft (2), the stretching pretightening force of the bolt (6) is 127 kilonewtons, and removing the nut (7), the intermediate shaft (2) and the bolt (6);
10 Four positioning pins (10) are arranged in the positioning pin holes (9) of the corresponding lower half coupling (3), the intermediate shaft (2) is assembled, the bolts (6) of the lower half coupling (3) and the intermediate shaft (2) are arranged, the bolts (6) are stretched, the stretching pretightening force of the bolts (6) is 121 kilonewtons, and the nuts (7) are fastened;
11 Corresponding positioning pins (10) are installed in positioning pin holes (9) of the intermediate shaft (2) and the upper half coupling (1), the upper half coupling (1) is assembled, bolts (6) of the upper half coupling (1) and the intermediate shaft (2) are installed, the bolts (6) are stretched, and the nuts (7) are fastened by stretching pretightening force 121 of the bolts (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210223490.6A CN114434110B (en) | 2022-03-09 | 2022-03-09 | Technological method for simultaneously processing and assembling main shaft seal system of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210223490.6A CN114434110B (en) | 2022-03-09 | 2022-03-09 | Technological method for simultaneously processing and assembling main shaft seal system of nuclear power station |
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| Publication Number | Publication Date |
|---|---|
| CN114434110A CN114434110A (en) | 2022-05-06 |
| CN114434110B true CN114434110B (en) | 2024-02-20 |
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| CN202210223490.6A Active CN114434110B (en) | 2022-03-09 | 2022-03-09 | Technological method for simultaneously processing and assembling main shaft seal system of nuclear power station |
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| CN114434110A (en) | 2022-05-06 |
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