CN112247492B - Method for connecting impeller cover of closed impeller and impeller - Google Patents
Method for connecting impeller cover of closed impeller and impeller Download PDFInfo
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- CN112247492B CN112247492B CN202011157275.8A CN202011157275A CN112247492B CN 112247492 B CN112247492 B CN 112247492B CN 202011157275 A CN202011157275 A CN 202011157275A CN 112247492 B CN112247492 B CN 112247492B
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- impeller
- cover
- blades
- shroud
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of impeller processing, in particular to a method for connecting an impeller cover of a closed impeller and the impeller, which is provided aiming at the defect that the prior closed impeller has a blind area in the processing process and comprises the following steps: the impeller adopts an integrated processing mode, a split type impeller cover is processed, impeller cover flaps are assembled on the impeller, and a plurality of impeller cover flaps are welded together through diffusion welding. The impeller cover is welded in a decomposition and re-synthesis mode, the method breaks through the conventional thinking mode, and simultaneously reduces the rebound deformation, thermal deformation, cracks and the like generated by welding after direct split manufacturing.
Description
The technical field is as follows:
the invention belongs to the technical field of impeller machining, and particularly relates to a method for connecting an impeller cover of a closed impeller with the impeller.
Background art:
at present, the impeller can be divided into: closed impeller, front semi-open impeller, back semi-open impeller, open impeller. The closed impeller is characterized in that an inter-impeller flow passage is only opened at an air inlet and an air outlet, the rest parts are closed, and the flow passage is often a three-dimensional space bending and long and narrow opposite-shaped cavity. Because of the superiority of the structure and performance of the closed impeller, the closed impeller is more and more applied to the fields of aerospace and advanced turbomachinery, including aerospace engines, nuclear power equipment, mining equipment, ship power and other application occasions, related products include steam turbines, turboexpanders, water turbines, wind turbines, turbo compressors, centrifugal pumps and the like, and the development of the design and manufacturing technology of the closed impeller has great significance for promoting national defense science and technology and national economy. When the closed impeller is machined by adopting a straight shank cutter, each point of an inter-blade flow channel is difficult to reach, the accessibility of the cutter is poor, and especially for the closed impeller with a large number of blades and large bending degree, which causes the narrow and twisted flow channel, a machining 'blind area' which cannot be achieved by the straight shank cutter often exists. Although some closed impellers can be directly machined by five shafts, the cutter cannot completely machine the appearance of the impeller for the impeller with large distortion, and the cutter still has a blind area during machining.
The invention content is as follows:
the invention provides a method for connecting an impeller cover of a closed impeller and the impeller, aiming at overcoming the defect that the existing closed impeller with large distortion has a blind area in the processing process.
The technical scheme adopted by the invention is as follows: a method for connecting an impeller cover of a closed impeller and an impeller specifically comprises the following steps:
and 4, welding the impeller vanes together through diffusion welding.
Preferably, in the step 2, the impeller cover is processed by the following specific steps:
step 21, blanking and roughly machining to form two impeller covers to be machined, so that the overall appearance of each impeller cover to be machined is basically the same as that of a target impeller cover;
step 22, further fine machining is carried out on each impeller cover to be machined, and four positioning holes are machined in each impeller cover to be machined;
and step 23, cutting each processed impeller cover into two equal parts, then processing impeller grain grooves one by one to enable each part to be 180 degrees, and finally, finely processing each part through a five-axis processing center to enable each part to be 180 degrees to be processed into a standard 120-degree impeller cover flap.
Preferably, the specific number of the impeller shroud lobes in the step 23 is six, each machined impeller shroud is cut into two equal parts, then the impeller grain grooves are machined one by one to make each part be 180 degrees, and finally the impeller shroud lobes are precisely machined through a five-axis machining center to make each part be 180 degrees and machined into two standard 60-degree impeller shroud lobes.
Preferably, the blades comprise main blades and splitter blades, and the main blades and the splitter blades are alternately fixed on the wheel disc.
Preferably, in the step 4, the impeller cover formed by splicing the impeller cover flaps is spliced and fixed with the impeller together, and the impeller cover is placed in a vacuum diffusion welding machine.
The invention has the beneficial effects that:
1. the original processing method of the closed impeller is to put an impeller cover on the impeller and connect the two parts together in a welding mode, but due to the structural reason that the impeller is greatly distorted, all welding points cannot be touched in the welding process, so that the processing is incomplete, and all parameters of the closed impeller are influenced. In the invention, the impeller cover adopts a welding mode of decomposition and re-synthesis, the method breaks through the conventional thinking mode, and simultaneously reduces the rebound deformation, thermal deformation, cracks and the like generated by welding after direct split manufacturing.
2. The invention adopts the diffusion welding mode to weld the impeller and the impeller cover together without dead angles, effectively overcomes the problem of processing blind areas during brazing, realizes the complete seamless welding of the impeller and the impeller cover, thereby greatly improving the strength and the service life of the closed impeller.
Description of the drawings:
FIG. 1 is a flow chart of a connection method of the present invention;
FIG. 2 is a schematic structural view of an impeller cup to be machined;
FIG. 3 is a schematic view of the machining of the grooves of the impeller texture;
FIG. 4 is a rear view of FIG. 3;
FIG. 5 is a front view of the impeller shroud after welding with the impeller;
FIG. 6 is a bottom view of FIG. 5;
wherein: 1 wheel disc, 2 blades, 3 impeller covers, 31 impeller cover lobes, 32 impeller grain grooves and 33 positioning holes
The specific implementation mode is as follows:
as shown in fig. 1, the present invention is a method for connecting an impeller shroud and an impeller of a closed impeller, which specifically comprises the following steps:
And 2, processing the split type impeller cover 3, wherein the impeller cover 3 is formed by splicing multi-blade impeller cover blades 31, and impeller grain grooves 32 matched with the blades 2 are respectively processed on the inner wall of each impeller cover blade 31.
As shown in fig. 2 to 4, the impeller shell 3 is manufactured by the following steps:
the higher the machine tool rotation speed, the more precise the machining, in this embodiment the machine tool rotation speed is 15000 rpm, and a flat cutter is used when machining the impeller grain groove 32 of the impeller shroud 3.
Step 21, firstly, blanking is carried out, the blanking size is 33mm, the material is aluminum, a three-jaw chuck is used for clamping the excircle of the material, then rough machining is carried out, and a bored hole phi 68 is drilled 0 +0.1 The inner hole of the three-jaw chuck support is 30.28 percent of the flat end surface 0 +0.1 Turning the outer circle phi 107 and the step phi 85, and processing two impeller covers to be processed with the same size. After rough machining, the overall appearance of each impeller cover to be machined is basically the same as that of the target impeller cover, and in order to be matched with the impeller, the impeller cover to be machined needs to be further finely machined.
And step 22, performing further fine machining on each impeller cover to be machined, drilling four phi 5 positioning holes 33 on the step with the thickness of 7mm on each impeller cover to be machined, and enabling the hole distance between each positioning hole 33 and the positioning holes 33 adjacent to two sides to be 52mm and 80mm respectively. The four positioning holes 33 are used for facilitating clamping when the impeller cover 3 is machined and have a positioning function;
step 23, scribing and dividing each impeller cover to be processed into two equal parts, then processing an impeller grain groove 32, and finally processing the impeller cover flap 31 into the required impeller cover flaps by the conventional two processing methods,
the first mode is as follows: the specific number of impeller vanes 31 is three.
Firstly, cutting each processed impeller cover into two equal parts, enabling each part to be 180 degrees, then processing impeller grain grooves 32 one by one, finally, finely processing each 180 degrees through a five-axis processing center, processing each 180 degrees into a standard 120-degree impeller cover flap 31, and finally splicing the three 120-degree impeller cover flaps 31 into the standard 360-degree impeller cover 3.
The second mode is as follows: the specific number of impeller vanes 31 is six.
Firstly, cutting each processed impeller cover into two equal parts, enabling each part to be 180 degrees, then finely processing each part at 180 degrees through a five-axis processing center, processing each part at 180 degrees into two standard 60-degree impeller cover flaps 31, and finally splicing six 60-degree impeller cover flaps 31 into a standard 360-degree impeller cover 3.
The influence of the choice of the number of impeller lobes 31 on the shaping of the entire impeller cup 3: assuming that a to-be-processed impeller cover is directly divided into three equal parts by direct scribing, the impeller cover 3 after splicing and forming cannot realize accurate 360 degrees, because the division into three parts means that the cutting allowance influences the finally formed size, the size of the impeller cover 31 after splicing and forming is reduced no matter what decomposition (linear cutting, water cutting and the like) is adopted, and the processing of the impeller belongs to precise processing and has high requirements on the size, so the impeller cover cannot be realized by directly cutting into three equal parts.
The influence of the choice of the number of impeller vanes 31 on the machining of the entire impeller cup 3: when the impeller cover flap 31 is cut into three equal parts or six equal parts, the part size is too small, the number of parts is more, the clamping difficulty is high when the impeller cover flap is assembled with a tool, and then the accurate processing of the impeller grain groove 32 cannot be realized, but the impeller grain groove 32 is processed when the impeller cover to be processed is cut into two equal parts, so that the problems of difficult clamping and difficult positioning are effectively avoided, and therefore, the impeller cover 3 is reasonably formed by 3-6 split impeller cover flaps 31.
And 3, assembling the impeller cover 3 with the impeller after the impeller cover is machined. Firstly, each impeller shroud 31 is respectively assembled on the impeller, each blade 2 is inserted into the corresponding impeller grain groove 32, and the impeller shroud 3 are well contacted and have stable performance through the insertion matching of the blade 2 and the impeller grain groove 32.
And 4, welding the impeller cover 3 and the impeller.
At present, in the prior art, when an impeller cover and an impeller are assembled, brazing is generally adopted, and for brazing, the defects exist in welding, and because the impeller is greatly distorted, a plurality of processing blind areas can be formed in the brazing process, so that the welding is not in place, and the quality strength of the welded product is not too high. The diffusion welding mode has small welding pressure, the workpiece does not generate macroscopic plastic deformation, and the diffusion welding method is suitable for precision parts which are not machined after welding, so the diffusion welding mode is adopted for machining instead of brazing in the embodiment.
Firstly, the impeller cover 3 formed by splicing the impeller cover flaps 31 is spliced and fixed with the impeller, then the impeller cover 3 is placed in a vacuum diffusion welding machine and kept for a period of time at a certain high temperature and high pressure, so that atoms between contact surfaces of the impeller cover flaps 31 are diffused mutually, and finally the impeller cover 3 is formed by welding the impeller cover flaps 31 into a whole, and the closed impeller shown in fig. 5 and 6 is obtained.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method for connecting an impeller cover of a closed impeller and the impeller is characterized by comprising the following steps:
step 1, an impeller comprises a wheel disc (1) and blades (2), and an integrated processing mode is adopted;
step 2, processing a split type impeller cover (3), wherein the impeller cover (3) is formed by splicing multi-blade impeller cover blades (31), and impeller grain grooves (32) matched with the blades (2) are respectively processed on the inner wall of each impeller cover blade (31);
step 3, respectively assembling impeller cover flaps (31) on the impellers, and inserting the blades (2) into the impeller grain grooves (32);
and 4, welding the impeller vanes (31) together through diffusion welding.
2. A method of attaching a shroud impeller shroud to an impeller according to claim 1, wherein: in the step 2, the impeller cover (3) is specifically processed by the following steps:
step 21, blanking and roughly machining to form two impeller covers to be machined, so that the overall appearance of each impeller cover to be machined is basically the same as that of a target impeller cover;
step 22, carrying out further fine machining on each impeller cover to be machined, and machining four positioning holes (33) in each impeller cover to be machined;
step 23, the specific number of the impeller vanes (31) is three, each processed impeller vane is cut into two equal parts, each part is 180 degrees, then impeller grain grooves (32) are processed one by one, and finally each part is finely processed through a five-axis processing center, so that each part is processed into a standard 120-degree impeller vane (31) at 180 degrees.
3. A method of attaching a shroud impeller shroud to an impeller according to claim 2, wherein: the specific number of the impeller shroud lobes (31) in the step 23 is six, each machined impeller shroud is cut into two equal parts, each part is 180 degrees, then the impeller grain grooves (32) are machined one by one, and finally the impeller grain grooves are subjected to quasi-fine machining through a five-axis machining center, so that each 180 degrees is machined into two standard 60-degree impeller shroud lobes (31).
4. A method of connecting an impeller shroud and an impeller of a shrouded impeller according to any one of claims 1 to 3, wherein: the blades (2) comprise main blades and splitter blades, and the main blades and the splitter blades are alternately fixed on the wheel disc (1).
5. A method of joining an impeller shroud of a shrouded impeller according to any of claims 1 to 3, wherein: in the step 4, the impeller cover (3) formed by splicing the impeller cover lobes (31) is spliced and fixed with the impeller together and then placed in a vacuum diffusion welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011157275.8A CN112247492B (en) | 2020-10-26 | 2020-10-26 | Method for connecting impeller cover of closed impeller and impeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011157275.8A CN112247492B (en) | 2020-10-26 | 2020-10-26 | Method for connecting impeller cover of closed impeller and impeller |
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| CN112247492A CN112247492A (en) | 2021-01-22 |
| CN112247492B true CN112247492B (en) | 2022-08-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113414553B (en) * | 2021-06-30 | 2022-05-13 | 哈尔滨电气动力装备有限公司 | Machining process of main pump impeller cover of shaft seal of nuclear power station |
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| US9091277B1 (en) * | 2014-04-25 | 2015-07-28 | Computer Assisted Manufacturing Technology Corporation | Systems and methods for manufacturing a shrouded impeller |
| CN211666934U (en) * | 2019-12-31 | 2020-10-13 | 德清县东旭合金钢铸造有限公司 | Double-runner impeller of water pump |
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| CA2512126A1 (en) * | 2005-07-14 | 2007-01-14 | General Electric Canada | Split francis turbine runner |
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| CN112247492A (en) | 2021-01-22 |
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