CN114434110A - Process method for processing and assembling shaft systems of shaft seal main pump of nuclear power station at same time - Google Patents
Process method for processing and assembling shaft systems of shaft seal main pump of nuclear power station at same time Download PDFInfo
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- CN114434110A CN114434110A CN202210223490.6A CN202210223490A CN114434110A CN 114434110 A CN114434110 A CN 114434110A CN 202210223490 A CN202210223490 A CN 202210223490A CN 114434110 A CN114434110 A CN 114434110A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010168 coupling process Methods 0.000 claims abstract description 77
- 238000005859 coupling reaction Methods 0.000 claims abstract description 77
- 230000008878 coupling Effects 0.000 claims abstract description 68
- 238000003754 machining Methods 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000010009 beating Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 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
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- 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
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- 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
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Abstract
The invention relates to a process method for simultaneously machining and assembling a main shaft system of a shaft seal of a nuclear power station, which is characterized in that the 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 and nuts (7) are fastened, the shaft system is horizontally placed on a bracket (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 respectively machined by adopting the sequence of drilling, boring and reaming. The invention improves the precision, reduces the cost, greatly improves the efficiency by adopting integral processing, obtains great technological innovation compared with the prior technological method, is successfully applied to the product manufacturing process, has high efficiency and creates great benefit.
Description
The technical field is as follows:
the invention relates to a process method for processing and assembling shaft systems of a shaft seal main pump of a nuclear power station at the same time.
The background art comprises the following steps:
the technical method for the same machining and assembling of the shaft seal main pump shaft systems of the nuclear power station is the key for the normal operation of the shaft seal main pump of the nuclear power station, and the vibration value of the main pump is influenced by the same machining precision of the shaft systems and the diameter of the assembling method. The excessive vibration value can cause the abnormal operation of the nuclear main pump or the shutdown of the nuclear power station, and serious accidents can happen seriously. The same processing and assembling of the shaft seal main pump shaft systems of the nuclear power plant are particularly important for the localization of the shaft seal main pump. The same processing and assembling of shaft seal main pump shafting of a nuclear power station is an international technical problem and is a key technology for manufacturing a nuclear main pump. The existing common processing technology has the following defects that firstly, an integral reamer is adopted to process a positioning pin hole (9), the integral reamer has large processing resistance, 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 can be influenced, the situation that parts are unqualified to process and are scrapped can be caused, once the integral reamer is damaged, the whole cutter body is scrapped, the cost of a cutter is increased, the positioning pin hole (9) processed by the second prior art is axial, a positioning pin (10) penetrates through a coupler and an intermediate shaft (2), the gap is small, assembly is difficult, the condition of grinding is frequently caused, after operation, the cylindrical pin can generate tiny deformation under the action of shearing force, the cylindrical pin can be prevented from being dismounted, destructive dismounting can be caused, and the intermediate shaft (2) and the coupler can be scrapped when the grinding is serious, especially when a nuclear power station is overhauled, once the situation of difficult disassembly occurs, the working condition with radiation is existed, the working time of workers is difficult to increase, the torque bolt is used in the third prior art, the nut and the intermediate shaft (2) have relatively large friction force when the torque bolt is used, the surface of a workpiece is damaged, the bolt is abraded and cannot be disassembled seriously, only destructive disassembly can be adopted, the torque wrench is long, the operation is inconvenient when the torque wrench is assembled in a main pump, the fourth prior art uses the torque wrench for fastening, the intermediate shaft (2) and the shaft coupling generate tiny displacement when the bolt is used, and a jumping shaft system is unqualified due to the acting force of the torque wrench, the fifth prior art respectively processes the positioning pin holes (9) of the lower half coupling (3) and the intermediate shaft (2) by sectional type, and the simultaneous addition of the positioning pin holes (9) of the upper half coupling (1) and the intermediate shaft (2) is carried out after the integral assembly jumping inspection is qualified Workers need to carry out assembly and inspection for many times, and the damage risk and cost of disassembly and assembly are increased.
The invention content is as follows:
the invention aims to disclose a process method for processing and assembling a shaft seal main pump shaft system of a nuclear power station in the same way, which has high precision and high adjustment efficiency. The technical scheme of the invention is as follows: a shaft system which is qualified in runout inspection is assembled on an upper half coupling (1) and an intermediate shaft (2) in a bolt stretching mode, a nut (7) is fastened after the assembly, a bolt (6) of a lower half coupling (3) and the intermediate shaft (2) is stretched and the nut (7) is fastened, the shaft system is horizontally placed on a bracket, four radial positioning pin holes (9) of the upper half coupling (1) and the intermediate shaft are machined in the sequence of drilling, boring and reaming, processing four radial locating pin holes (9) of half-coupling (3) and jackshaft (2) down, measuring locating pin hole (9), according to the size after measuring prepare locating pin (10) one by one, disassemble and go up half-coupling (1) and jackshaft (2), assemble locating pin (10), assemble again: the method comprises the following steps: 1) assembling an upper half coupling (1), an intermediate shaft (2), a lower half coupling (3), a lower pump shaft (4) and an impeller (5) which finish a shafting run-out inspection component, stretching a bolt (6) of the lower half coupling (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 coupling (1) and the intermediate shaft (2), and fastening the nut (7) by the stretching pretightening force of the bolt (6) of 121 kilonewtons;
2) the assembled shaft system components of the upper half coupling (1), the intermediate 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 processed 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, and the processing parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30 mm/min;
4) boring a radial positioning pin hole (9) drilled on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by using a boring cutter, wherein the positioning pin hole (9) is machined to a diameter of 24.8mm, the depth of the positioning pin hole is 93.5mm, and the machining parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40 mm/min;
5) adopting the reamer of interchangeable hair style to ream radial locating pin hole (9) of boring processing of lower half-coupling (3) and jackshaft (2) faying face, locating pin hole (9) are processed to diameter 25H7mm, and the degree of depth is 93.5mm, and roughness is Ra1.6 mu m, and the processing parameter is: the rotating speed is 50r/min, and the feeding speed is 15 mm/min;
6) processing four radial positioning pin holes (9) on the combined surface of the upper half coupling (1) and the intermediate shaft (2) according to the processes of the step 3), the step 4) and the step 5):
7) marking each positioning pin hole (9) by using 1-8 natural numbers;
8) measuring the machining size of each positioning pin hole (9) and recording according to the mark;
8) processing 8 positioning pins (10) according to a clearance of 0.01 mm;
9) stretching a bolt (6) of an upper half coupling (1) and an 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 coupling (1), stretching a bolt (6) of a lower half coupling (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) the 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) and (3) installing the corresponding cylindrical pin (10) into the positioning pin hole (9) of the intermediate shaft (2) and the upper half coupling (1), assembling the upper half coupling (1), installing the bolt (6) of the upper half coupling (1) and the intermediate shaft (2), stretching the bolt (6), stretching the pre-tightening force 121 of the bolt (6), and fastening the nut (7).
The invention has the technical effects that:
the main pump shafting positioning pin hole (9) is processed in the radial direction, the head-replaceable reamer is adopted, and the shafting coupler and the intermediate shaft (2) are fastened in a bolt stretching mode. The process method has the advantages that: firstly, compared with the integral hard alloy reamer, the adopted replaceable reamer has smaller resistance of a reamer machine tool, ensures the precision, has enough space for containing scraps, avoids scrap iron from damaging the processed surface, can obtain better surface roughness, has a modular structure, can replace cutter bits, can install reamer bits with different diameters on the same cutter bar, reduces the cost and the inventory, secondly, the positioning pin (10) is provided with half of the positioning pin holes (9) respectively on a coupler and an intermediate shaft (2), as shown in figure 2, the positioning pin (10) can be disassembled by disassembling the coupler and the intermediate shaft (2) during the disassembly, the radial positioning pin holes (9) can not generate the condition that the positioning pin (10) can not be disassembled due to the damage of the positioning pin (10) relative to the axial positioning pin holes (9), also avoids the condition of difficult disassembly due to gaps, and thirdly, the radial positioning pin (10) is excessively small, and increases the positioning precision relative to the axial positioning pin (10), fourthly, the coupler is assembled in a bolt stretching mode, so that the condition of bolt damage is avoided, and the condition that a workpiece is required to be damaged and can be disassembled due to the bolt damage and the positioning pin (10) damage is also avoided, fifth, the coupler and the intermediate shaft (2) are assembled in a bolt stretching mode, so that the intermediate shaft (2) and the coupler cannot generate displacement when the positioning pin (10) is not processed, so that the precision is not influenced, sixth, a shaft system assembled in a radial positioning and stretching mode can be integrally and simultaneously processed through the positioning pin (10) to integrally process the positioning pin holes (9) of the upper half coupler (1) and the intermediate shaft (2) and the positioning pin holes (9) of the lower half coupler (3) and the intermediate shaft (2), the efficiency is improved compared with the split simultaneous processing, the cost is reduced, the assembly times are reduced, the collision risk caused by assembly is reduced, and seventh is that the assembling and disassembling time under the radiation working condition is greatly shortened in the overhauling process, the condition that the assembly can not be disassembled due to grinding injury possibly generated during overhauling is avoided.
Description of the drawings:
FIG. 1 is a schematic view of the shaft system components in the same machining state
FIG. 2 is a schematic view of the positions of the intermediate shaft (2) and the lower coupling half (3) and the cylindrical pin
The specific implementation mode is as follows:
as shown in fig. 1, a process method for processing and assembling shaft systems of a main pump of a nuclear power station shaft seal together includes that a shaft system qualified in runout inspection is assembled on an upper half coupling 1 and an intermediate shaft 2 in a bolt stretching mode, a nut 7 is fastened after assembly, a bolt 6 of a lower half coupling 3 and the intermediate shaft 2 is stretched and the nut 7 is fastened, the shaft system is horizontally placed on a support, four radial positioning pin holes 9 of the upper half coupling 1 and the intermediate shaft are processed in the order of drilling, boring and reaming, the four radial positioning pin holes 9 of the lower half coupling 3 and the intermediate shaft 2 are processed, the positioning pin holes 9 are measured, positioning pins 10 are prepared one by one according to the measured size, the upper half coupling 1 and the intermediate 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 coupling 1, an intermediate shaft 2, a lower half coupling 3, a lower pump shaft 4 and an impeller 5 which finish a shafting run-out inspection component, stretching a bolt 6 of the lower half coupling 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 coupling 1 and the intermediate shaft 2, and fastening the nut 7 by the stretching pretightening force of the bolt 6 of 121 kilonewtons;
2) the assembled shaft system 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 the bracket 8 and fixed;
3) four radial positioning pin holes 9 are processed 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, and the processing parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30 mm/min;
4) boring the radial positioning pin hole 9 drilled on the joint surface of the lower half coupling 3 and the intermediate shaft 2 by using a boring cutter, wherein the positioning pin hole 9 is machined to have a diameter of 24.8mm, the depth is 93.5mm, and the machining parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40 mm/min;
5) as shown in fig. 2, a replaceable reamer is used for reaming a positioning pin hole 9 bored and machined in the radial direction on the joint surface of the lower half coupling 3 and the intermediate shaft 2, the positioning pin hole 9 is machined to have a diameter of 25H7mm, the depth is 93.5mm, the roughness is Ra1.6 μm, and the machining parameters are as follows: the rotating speed is 50r/min, and the feeding speed is 15 mm/min;
6) processing four radial positioning pin holes 9 on the combined surface of the upper half coupling 1 and the intermediate shaft 2 according to the processes of the step 3), the step 4) and the step 5):
7) marking each positioning pin hole 9 by using natural numbers of 1-8;
8) measuring the machining size of each positioning pin hole 9 and recording according to the identification;
8) processing 8 positioning pins 10 according to a clearance of 0.01 mm;
9) stretching the bolt 6 of the upper half coupling 1 and the intermediate shaft 2, wherein the stretching force of the bolt 6 is 121 kilonewtons, detaching the nut 7, the bolt 6 and the upper half coupling 1, stretching the bolt 6 of the lower half coupling 3 and the intermediate shaft 2, the stretching pretightening force of the bolt 6 is 127 kilonewtons, and detaching the nut 7, the intermediate shaft 2 and the bolt 6;
10) the four cylindrical pins 10 are installed in the corresponding positioning pin holes 9 of the 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 of the bolts are stretched, the stretching pre-tightening force of the bolts 6 is 121 kilonewtons, and the nuts 7 are fastened;
11) and (3) installing the corresponding cylindrical pin 10 into the positioning pin hole 9 of the intermediate shaft 2 and the upper half coupling 1, assembling the upper half coupling 1, installing the bolt 6 of the upper half coupling 1 and the intermediate shaft 2, stretching the bolt 6, and fastening the nut 7 by the stretching pretightening force 121 of the bolt 6.
Claims (1)
1. A process method for processing and assembling shaft systems of shaft seal main pumps of nuclear power stations at the same time is characterized by comprising the following steps: the shafting after will beating the inspection qualified adopts the tensile mode assembly of bolt on last half-coupling (1) and jackshaft (2), fasten nut (7) after the assembly, bolt (6) of half-coupling (3) and jackshaft (2) are fastened down in the drawing and are put on the support, adopt drilling, the bore hole, the order of reamed is processed four radial positioning pinhole (9) of last half-coupling (1) and jackshaft, four radial positioning pinhole (9) to lower half-coupling (3) and jackshaft (2) are processed, measure location pinhole (9), size according to after measuring is prepared locating pin (10) one by one, disassemble last half-coupling (1) and jackshaft (2), assembly locating pin (10), assemble again: the method comprises the following steps: 1) assembling an upper half coupling (1), an intermediate shaft (2), a lower half coupling (3), a lower pump shaft (4) and an impeller (5) which finish a shafting run-out inspection component, stretching a bolt (6) of the lower half coupling (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 coupling (1) and the intermediate shaft (2), and fastening the nut (7) by the stretching pretightening force of the bolt (6) of 121 kilonewtons;
2) the assembled shaft system components of the upper half coupling (1), the intermediate 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 processed 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, and the processing parameters are as follows: the rotating speed is 220r/min, and the feeding speed is 30 mm/min;
4) boring a radial positioning pin hole (9) drilled on the joint surface of the lower half coupling (3) and the intermediate shaft (2) by using a boring cutter, wherein the positioning pin hole (9) is machined to a diameter of 24.8mm, the depth of the positioning pin hole is 93.5mm, and the machining parameters are as follows: the rotating speed is 400r/min, and the feeding speed is 40 mm/min;
5) adopting the reamer of interchangeable hair style to ream radial locating pin hole (9) of boring processing of lower half-coupling (3) and jackshaft (2) faying face, locating pin hole (9) are processed to diameter 25H7mm, and the degree of depth is 93.5mm, and roughness is Ra1.6 mu m, and the processing parameter is: the rotating speed is 50r/min, and the feeding speed is 15 mm/min;
6) processing four radial positioning pin holes (9) on the combined surface of the upper half coupling (1) and the intermediate shaft (2) according to the processes of the step 3), the step 4) and the step 5):
7) marking each positioning pin hole (9) by using 1-8 natural numbers;
8) measuring the machining size of each positioning pin hole (9) and recording according to the mark;
8) processing 8 positioning pins (10) according to a clearance of 0.01 mm;
9) stretching a bolt (6) of an upper half coupling (1) and an 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 coupling (1), stretching a bolt (6) of a lower half coupling (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) the 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) and (3) installing the corresponding cylindrical pin (10) into the positioning pin hole (9) of the intermediate shaft (2) and the upper half coupling (1), assembling the upper half coupling (1), installing the bolt (6) of the upper half coupling (1) and the intermediate shaft (2), stretching the bolt (6), stretching the pre-tightening force 121 of the bolt (6), and fastening the nut (7).
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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| CN114434110A true CN114434110A (en) | 2022-05-06 |
| CN114434110B CN114434110B (en) | 2024-02-20 |
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| CN114434110B (en) | 2024-02-20 |
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