Axial flow pump impeller casting correction machining method and axial flow pump impeller casting thereof

Abstract

The invention particularly discloses an axial flow pump impeller casting correction machining method and an axial flow pump impeller casting thereof. The method comprises the following steps that S100, the axial flow pump impeller casting is cast; s200, the impeller casting is fixed to a fixing mechanism to be corrected for the first time; s300, the inner hole and the end face of the hub corrected for the first time are subjected to primary machining; s400, the impeller casting is installed on the mandrel to be corrected for the second time and then fixed; s500, after the front end of the hub is machined, the impeller casting is turned around and fixed to the mandrel; s600, after the impeller casting is corrected for the third time, the rear end of the hub is machined; and S700, after the impeller casting is corrected for the fourth time, the impeller casting is subjected to finish turning. The supporting rings are arranged to support the blades, so that deformation of the blades can be avoided; and multi-reference correction is carried out in the machining process, so that the dimensional form and location tolerance of the impeller casting is ensured, and the performance parameters of the axial flow pump are within a controllable range.

Description

Technical Field

[0001] The present application belongs to the technical field of axial flow pump component processing, and in particular relates to a correction processing method for an axial flow pump impeller casting and an axial flow pump impeller casting. Background Art

[0002] An axial-flow pump is a pump that uses the blades of a rotating impeller to exert force on the liquid, causing it to be transported along its axis. It is available in vertical, horizontal, oblique, and tubular types. Generally speaking, an axial-flow pump impeller is equipped with two to seven blades and rotates within a cylindrical pump casing. Fixed guide vanes are mounted on the pump casing above the impeller to eliminate the liquid's rotational motion, converting it into axial motion and converting the kinetic energy of the rotational motion into pressure energy. Axial-flow pumps are primarily suitable for low-head, high-flow applications. Due to the demand for new energy and environmental protection, they have been widely used in recent years as forced circulation pumps in MVR (high-efficiency crystallizing evaporator) units. They are also used in traditional industries such as irrigation, drainage, dock drainage, water level regulation in canal locks, and as large-scale circulating water pumps in power plants.

[0003] At present, the impeller of the axial flow pump is formed into a casting blank through a casting process. After casting, the axial center lines of the two important components in the impeller casting (i.e., the hub and the blades) are offset to a certain extent. During the machining process, only one end of the impeller casting blank can be clamped. Therefore, the axial center and radial parallelism of the impeller need to be corrected. If only the shape of the hub blank is used for alignment, the center line and radial parallelism of the blades may be offset, which will affect the impeller's operating performance and reduce efficiency. In severe cases, the entire impeller will be unusable, resulting in product scrapping.

[0004] In view of this, the present application provides an axial flow pump impeller casting correction processing method and an axial flow pump impeller casting thereof, which are used to solve the above technical problems. Summary of the Invention

[0005] The technical solution provided in this application is made in view of the above technical problems. In order to solve the above technical problems, this application provides a correction processing method for an axial flow pump impeller casting, the method comprising the following steps:

[0006] S100, casting an axial flow pump impeller casting using an impeller casting mold, wherein the impeller casting includes a hub, blades, and a support ring, wherein the support ring is located outside the hub, the blades are annularly arranged on the hub, and one end of the blade away from the hub is connected to the support ring;

[0007] S200, fixing the impeller casting to the upper end surface of the fixing mechanism, and then performing a first calibration on the impeller casting based on an adjustable fulcrum provided on the lower end surface of the fixing mechanism and a preset standard value, wherein the first calibration includes calibration of the impeller outer diameter, the hub outer diameter, and the radial parallelism of the blades;

[0008] S300, performing primary processing on the wheel hub after the first calibration, the primary processing including inner hole processing and end surface processing of the wheel hub;

[0009] S400, mounting the initially processed impeller casting on the core shaft, performing a second correction on the axial clearance between the hub and the core shaft and the radial parallelism of the blades based on preset standard values, and then using a clamping mechanism to clamp the rear end of the second-corrected impeller casting to secure the impeller casting to the core shaft;

[0010] S500, performing a second processing on the impeller casting fixed on the mandrel, the second processing including processing the front end of the hub, then removing the impeller casting with the processed front end of the hub from the mandrel and rotating it 180 degrees, and re-fixing the impeller casting on the mandrel based on the front end face of the impeller casting;

[0011] S600, performing a third calibration on the impeller casting that has been re-fixed on the core shaft based on preset standard values, wherein the third calibration includes calibration of the axial clearance between the hub and the core shaft and the radial parallelism of the blades, and then machining the rear end of the hub after the third calibration;

[0012] S700: Perform a fourth correction on the impeller casting processed at the rear end of the hub based on preset standard values. The fourth correction includes correction of the axial centerline of the hub and the blades and the radial parallelism of the blades. Then, the impeller casting after the fourth correction is precision-turned.

[0013] In some embodiments, in step S100, the supporting ring is connected to the ends of the plurality of blades arranged in an annular manner on the hub by spot welding.

[0014] In some embodiments, the fixing mechanism is a four-jaw chuck.

[0015] In some embodiments, the plurality of adjustable fulcrums are evenly distributed on the lower end surface of the fixing mechanism.

[0016] In some embodiments, in step S200, the impeller casting is calibrated for the first time based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism and the preset standard value, specifically including:

[0017] S201, based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism, the outer diameter of the impeller is corrected by an external needle to ensure that the outer diameter of the impeller is consistent with a preset standard value;

[0018] S202: Based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism, the outer diameter of the wheel hub is corrected by an external scribe to ensure that the outer diameter of the wheel hub is consistent with a preset standard value;

[0019] S203. Correct the radial parallelism of the plurality of blades based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism and the point on the large outer circle of the impeller to ensure that the radial parallelism of each blade is consistent with a preset standard value.

[0020] In some embodiments, during the initial processing of step S300 , when the inner hole of the wheel hub is processed, a first preset margin value is left for the aperture of the inner hole of the wheel hub.

[0021] In some embodiments, in step S400, the pressing mechanism includes a pressing plate or an ejector pin, and the pressing plate or the ejector pin is used to press the rear end of the impeller casting after the second correction so that the impeller casting is fixed on the core shaft.

[0022] In some embodiments, after processing the rear end of the wheel hub after the third correction, a second preset margin value is left on the outer diameter of the wheel hub.

[0023] In some embodiments, in step S700, during the finish turning of the impeller casting after the fourth correction, it is also necessary to ensure that the dimensional accuracy and surface roughness of the impeller casting are within the maximum allowable deviation.

[0024] The present application also provides an axial flow pump impeller casting, which is prepared using the above-mentioned axial flow pump impeller casting correction processing method.

[0025] Compared with the prior art, the axial flow pump impeller casting correction processing method and axial flow pump impeller casting provided by this application have the following beneficial technical effects:

[0026] In order to prevent the blades from deforming during the subsequent processing of the impeller casting, a support ring is welded on the outside of the cast impeller casting so that the end of each blade away from the hub is fixedly connected to the inner side of the support ring, and the support ring can effectively support the blades in the impeller casting; during the processing of the impeller casting, in order to ensure the parallelism of the axial center line and radial direction of the hub and the blades, multiple references are used for correction. The entire correction process is divided into an initial correction stage, a process verification stage and a pre-finishing verification stage. Through the first initial correction, the impeller is first rough-machined to remove irregular blanks and preliminarily determine the machining allowances for the axial center line and radial parallelism of the impeller. After the rough machining is completed, the process correction (i.e., the second and third corrections) is performed and then secondary processing is performed; finally, the pre-finishing correction inspection is performed and then fine machining is performed, thereby finally ensuring that the impeller reaches the preset standard value, ensuring the dimensional and positional tolerances of the impeller casting, so that the performance parameters of the axial flow pump are within a controllable range, and solving the technical problems existing in the prior art.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 is a flow chart of a correction processing method for an axial flow pump impeller casting in some embodiments of the present application,

[0030] Figure 2 The figure shows a schematic structural diagram of an axial flow pump impeller casting cast based on an impeller casting mold in the present application.

[0031] In the figure: 1. Hub, 2. Blades, 3. Support ring. DETAILED DESCRIPTION

[0032] The "ranges" disclosed herein are defined in the form of lower and upper limits, where a given range is defined by selecting a lower limit and an upper limit, the selected lower limit and upper limit defining the boundaries of a particular range. Ranges defined in this manner may be inclusive or exclusive of the end values, and may be arbitrarily combined, i.e., any lower limit may be combined with any upper limit to form a range. For example, if a range of 60-120 and 80-110 is listed for a particular parameter, it is understood that a range of 60-110 and 80-120 is also contemplated. In addition, if the minimum range values ​​listed are 1 and 2, and if the maximum range values ​​listed are 3, 4, and 5, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise specified, a resin range "ab" represents an abbreviation for any real number combination between a and b, where a and b are both real numbers. For example, a resin range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these resin combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0033] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0034] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0035] It should be noted that, in this embodiment, the preset standard value refers to the theoretical value required by the design of the impeller casting. Specifically, during the first calibration process, the preset standard value refers to the theoretical value required by the design of the impeller outer diameter, the hub outer diameter and the radial parallelism of the blades; during the second and third calibration processes, the preset standard value refers to the theoretical value required by the design of the axial clearance between the hub 1 and the core shaft and the radial parallelism of the blades; during the fourth calibration process, the preset standard value refers to the theoretical value required by the design of the hub 1 and the center line of the blade axis and the radial parallelism of the blades.

[0036] refer to Figure 1 、 Figure 2 As shown, the embodiment of the present application provides a correction processing method for an axial flow pump impeller casting, the method comprising the following steps:

[0037] S100, casting an axial flow pump impeller casting using an impeller casting mold, wherein the impeller casting includes a hub 1, blades 2, and a support ring 3, wherein the support ring 3 is located outside the hub 1, and the blades 2 are annularly arranged on the hub 1, and one end of the blades 2 away from the hub 1 is connected to the support ring 3;

[0038] In this step, during the casting process of the impeller casting, the end of the blade 2 connected to the hub 1 is fixed by an integrated molding method, and the inner side surface of the support ring 3 is fixedly connected to the end of the blade 2 away from the hub 1 by spot welding. That is, a support ring 3 is fixedly connected to the outer side surface of the existing impeller casting to support the end of each blade 2 away from the hub 1, thereby avoiding deformation of the blade 2 during the later processing of the impeller casting.

[0039] S200, fixing the impeller casting to the upper end surface of the fixing mechanism, and then performing a first calibration on the impeller casting based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism and the preset standard value, wherein the first calibration includes calibration of the impeller outer diameter, the hub 1 outer diameter, and the radial parallelism of the blades 2;

[0040] In this step, a four-jaw chuck is used as the fixing mechanism, and the preset standard value refers to the theoretical value required by the design of the hub 1. After the impeller casting is calibrated using the adjustable fulcrum, if the actual value and the preset standard value are within the allowable error range, the first calibration process can be considered effective.

[0041] In this step, the adjustable support point adopts a fine thread jack (also known as a screw jack), the core principle of which is to convert the rotary torque into a linear lifting force through a screw pair transmission, and to realize stable support of the heavy object by using the self-locking characteristics of the screw thread. When the thread angle is less than the friction angle (i.e., tanα<μtanα<μ, μ is the friction coefficient, and α is the thread angle), the system is self-locked, preventing the heavy object from sliding down.

[0042] Fast no-load lifting: high-speed lifting (400-1000mm / min) without load;

[0043] Heavy load low-speed jacking: switch to large reduction ratio when carrying load, output stable micron-level displacement (error ≤0.05mm);

[0044] Lateral fine adjustment capability: a horizontal screw is integrated into the adjustable support point base, which can also be used for ±10mm lateral position calibration when supporting the heavy object.

[0045] Specifically, first, the impeller casting is fixed on the upper end face of the four-jaw chuck through the clamping jaws of the four-jaw chuck, and then the adjustable support points arranged at the lower end of the four-jaw chuck are used to perform the first correction on the impeller casting. Specifically, based on the preset standard value, the outer diameter of the impeller, the outer diameter of the hub 1, and the radial level of the blade 2 are corrected through the adjustable support points, and the correction process includes:

[0046] S201, based on the adjustable support points arranged on the lower end face of the fixing mechanism, and through the external marking needle, the outer diameter of the impeller is corrected to ensure that the outer diameter of the impeller is consistent with the preset standard value;

[0047] S202, based on the adjustable support points arranged on the lower end face of the fixing mechanism, and through the external marking needle, the outer diameter of the hub 1 is corrected to ensure that the outer diameter of the hub 1 is consistent with the preset standard value;

[0048] S203, based on the adjustable support points arranged on the lower end face of the fixing mechanism and the points on the large outer circle of the impeller, the radial parallelism of the plurality of blades 2 is corrected to ensure that the radial parallelism of each blade 2 is consistent with the preset standard value.

[0049] It should be noted that during the first correction, the second correction, the third correction and / or the fourth correction, the correction value and the preset standard value should be within the allowable error range to be considered effective for the corresponding correction process. In this embodiment, the allowable error range is ≤0.1mm.

[0050] S300, the hub 1 after the first correction is subjected to primary machining, which includes inner hole machining of the hub 1 and end face machining of the hub 1;

[0051] In this step, after the first correction of the impeller casting is completed, the hub 1 can be initially processed. Specifically, the inner hole and the end face of the hub 1 are rough-processed. After rough processing, the inner hole diameter of the hub 1 has a first preset margin value, that is, there should be a margin between the inner hole diameter of the hub 1 and the preset standard value. In this embodiment, the first preset margin value is 0.2mm.

[0052] S400, installing the initially processed impeller casting onto the core shaft, performing a second calibration on the axial clearance between the hub 1 and the core shaft and the radial parallelism of the blades 2 based on preset standard values, and then using a clamping mechanism to clamp the rear end of the second-calibrated impeller casting to secure the impeller casting to the core shaft;

[0053] In this step, the clamping mechanism is a pressure plate or a thimble. First, one end of the initially processed impeller casting (in this embodiment, the front end of the impeller casting is first mounted on the mandrel) is mounted on the pre-prepared mandrel. Then, based on preset standard values, a second calibration is performed on the axial clearance between the hub 1 and the mandrel and the radial parallelism of the blades 2. After the second calibration is completed, the other end (i.e., the rear end) of the impeller casting is clamped using the clamping mechanism. At this point, the impeller casting is fixedly connected to the mandrel.

[0054] S500, performing a second processing on the impeller casting fixed on the mandrel, the second processing including processing the front end of the hub 1, then removing the impeller casting with the processed front end of the hub 1 from the mandrel and rotating it 180°, and re-fixing the impeller casting on the mandrel based on the front end face of the impeller casting;

[0055] In this step, the impeller casting fixed on the core shaft is first processed for the second time. Specifically, the front end of the hub 1 is processed based on the preset standard value. After the processing of the front end of the hub 1 is completed, the impeller casting is removed from the core shaft and rotated 180° to swap the front and rear ends of the impeller casting, and then the impeller casting is fixed on the core shaft again.

[0056] S600, performing a third calibration on the impeller casting that has been re-fixed on the core shaft based on preset standard values, wherein the third calibration includes calibrating the axial clearance between the hub 1 and the core shaft and the radial parallelism of the blades 2, and then machining the rear end of the hub 1 after the third calibration;

[0057] In this step, the impeller casting, which is once again fixed to the mandrel, is first calibrated a third time based on preset standard values. This third calibration specifically includes recalibrating the axial clearance between the hub 1 and the mandrel, as well as recalibrating the radial parallelism of each blade 2. After the third calibration is completed, the rear end of the hub 1 is machined based on the preset standard values. It should be noted that after machining the front and rear ends of the hub 1, the outer diameter of the hub 1 should have a second preset margin, meaning there should be a margin between the outer diameter of the hub 1 and the preset standard value. In this embodiment, the second preset margin is 0.2 mm.

[0058] S700, performing a fourth correction on the impeller casting processed at the rear end of the hub 1 based on a preset standard value, wherein the fourth correction includes correction of the axial center line of the hub 1 and the blade 2 and the radial parallelism of the blade 2, and then finishing turning the impeller casting after the fourth correction.

[0059] In this step, after the rear end processing of the hub 1 is completed, the impeller casting is corrected for the fourth time based on the preset standard value, specifically including: correcting the axial center line of the hub 1 and the blade 2, and correcting the radial parallelism of each blade 2. After the fourth correction of the impeller casting is completed, the impeller casting can be finish-turned. It should be noted that during the finish-turning process of the impeller casting, it is necessary to ensure that the dimensional accuracy and surface roughness of the impeller casting are within the maximum allowable deviation. Finally, the required impeller casting can be obtained after removing the outer support ring 3.

[0060] In the above embodiment, in order to prevent the blades 2 from deforming during the subsequent processing of the impeller casting, a supporting ring 3 is welded on the outside of the cast impeller casting, so that the end of each blade 2 away from the hub 1 is fixedly connected to the inner side of the supporting ring 3, and then the supporting ring 3 can effectively support the blades 2 in the impeller casting; in the processing of the impeller casting, in order to ensure the parallelism of the axial center line and radial direction of the hub 1 and the blades 2, multiple references (the front end of the hub 1 and the rear end of the hub 1) are used for correction. The whole correction process is divided into the initial correction stage, the process During the verification stage and the verification stage before fine machining, the impeller is first rough-machined to remove irregular blanks through the first preliminary comparison, and the machining allowances guaranteed by the axial center line and radial parallelism of the impeller are preliminarily determined. After the rough machining is completed, the process correction (i.e. the second correction and the third correction) is carried out before secondary machining; finally, the correction inspection before fine machining is carried out before fine machining, thereby ultimately ensuring that the impeller reaches the preset standard value, ensuring the dimensional and positional tolerances of the impeller casting, so that the performance parameters of the axial flow pump are within the controllable range, and solving the technical problems existing in the prior art.

[0061] The present application also provides an axial flow pump impeller casting, which is prepared using the above-mentioned axial flow pump impeller casting correction processing method.

[0062] Based on the description of the beneficial technical effects of the above-mentioned axial flow pump impeller casting correction processing method, the axial flow pump impeller casting prepared by this method has the same beneficial technical effects, which will not be repeated here.

[0063] In order to further illustrate the working principle and technical effects of the present invention, a comparative test is conducted below using CFD fluid simulation software on an axial flow pump impeller prepared by the correction processing method of the axial flow pump impeller casting provided in this application and an axial flow pump impeller prepared by the existing method.

[0064] 1) The design model of the axial flow pump impeller casting was calculated based on CFD fluid simulation software. At the same time, the axial flow pump impeller prepared in this application and the axial flow pump impeller prepared by the existing method were simulated and tested on a hydraulic machinery test bench. The results are shown in Table 1.

[0065] Table 1 Calculation results of impeller castings in CFD simulation software and test results on hydraulic machinery test bench

[0066]

[0067]

[0068] As can be seen from Table 1, the CFD simulation software takes two points and uses FLUEN and CFX to simulate and calculate the two axial flow pump impeller castings respectively. Among them, under the same flow rate, the head and efficiency of the product prepared by the present application are comparable to the CFD theoretical calculation results, while the head and efficiency of the product prepared by the existing method are lower than the CFD theoretical calculation results, that is, the head value and efficiency value corresponding to the axial flow pump impeller casting prepared by the present application are much greater than the axial flow pump impeller casting prepared by the existing method. Compared with the axial flow pump impeller casting prepared by the existing method, the dimensional shape and position tolerances of the axial flow pump impeller casting prepared by the present application are more precise, thereby making the axial flow pump impeller prepared by the present application have better operating performance and higher efficiency.

[0069] 2) The axial flow pump impeller casting product prepared in this application was compared with the commercially available axial flow pump impeller casting product. The comparative experiment process is as follows: the axial flow pump impeller casting is placed on a hydraulic machinery test bench, and the hydraulic performance and energy-saving performance of the two axial flow pump impeller castings are tested and compared. The test results are shown in Table 2.

[0070] Table 2 Comparative test data of hydraulic performance and energy-saving performance of the impeller casting products prepared in this application and commercially available impeller casting products

[0071]

[0072]

[0073] It can be seen from Table 2 that under the same hydraulic performance conditions, the operating current of the impeller casting product prepared by the present application is 238.1A and the power consumption is 164.33kW.h, while the operating current of the impeller casting product prepared by the existing method is 336.3A and the power consumption is 209.66kW.h. In comparison, under the same hydraulic performance conditions, the operating current and power consumption of the impeller casting product prepared by the present application are lower. Therefore, the axial flow pump impeller casting prepared by the correction processing method of the axial flow pump impeller casting provided by the present application has better energy-saving performance.

[0074] In summary, the impeller casting prepared in this application has more precise dimensional tolerances, which makes it have the characteristics of high efficiency and low cost.

[0075] The above is a detailed introduction to the correction processing method of an axial flow pump impeller casting and the axial flow pump impeller casting provided by this application. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the core idea of ​​this application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A correction processing method for an axial flow pump impeller casting, characterized in that: The method comprises the following steps: S100, casting an axial flow pump impeller casting using an impeller casting mold, wherein the impeller casting includes a hub, blades, and a support ring, wherein the support ring is located outside the hub, the blades are annularly arranged on the hub, and one end of the blade away from the hub is connected to the support ring; S200, fixing the impeller casting to the upper end surface of the fixing mechanism, and then performing a first calibration on the impeller casting based on an adjustable fulcrum provided on the lower end surface of the fixing mechanism and a preset standard value, wherein the first calibration includes calibration of the impeller outer diameter, the hub outer diameter, and the radial parallelism of the blades; S300, performing primary processing on the wheel hub after the first calibration, the primary processing including inner hole processing and end surface processing of the wheel hub; S400, mounting the initially processed impeller casting on the core shaft, performing a second correction on the axial clearance between the hub and the core shaft and the radial parallelism of the blades based on preset standard values, and then using a clamping mechanism to clamp the rear end of the second-corrected impeller casting to secure the impeller casting to the core shaft; S500, performing a second processing on the impeller casting fixed on the mandrel, the second processing including processing the front end of the hub, then removing the impeller casting with the processed front end of the hub from the mandrel and rotating it 180°, and re-fixing the impeller casting on the mandrel based on the front end face of the impeller casting; S600, performing a third correction on the impeller casting that has been fixed to the core shaft again based on preset standard values, wherein the third correction includes correcting the axial clearance between the hub and the core shaft and the radial parallelism of the blades, and then processing the rear end of the hub after the third correction; S700: Perform a fourth correction on the impeller casting processed at the rear end of the hub based on preset standard values. The fourth correction includes correction of the axial centerline of the hub and the blades and the radial parallelism of the blades. Then, the impeller casting after the fourth correction is precision-turned.

2. The axial flow pump impeller casting correction processing method according to claim 1, characterized in that: In step S100, the supporting ring is fixedly connected to the ends of the blades away from the hub by spot welding.

3. The axial flow pump impeller casting correction processing method according to claim 2, characterized in that: The fixing mechanism is a four-jaw chuck.

4. The axial flow pump impeller casting correction processing method according to claim 3, characterized in that: The plurality of adjustable fulcrums are evenly distributed on the lower end surface of the fixing mechanism.

5. The axial flow pump impeller casting correction processing method according to claim 4, characterized in that: In step S200, the impeller casting is calibrated for the first time based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism and the preset standard value, specifically including: S201, based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism, the outer diameter of the impeller is corrected by an external needle to ensure that the outer diameter of the impeller is consistent with a preset standard value; S202: Based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism, the outer diameter of the wheel hub is corrected by an external scribe to ensure that the outer diameter of the wheel hub is consistent with a preset standard value; S203. Correct the radial parallelism of the plurality of blades based on the adjustable fulcrum provided on the lower end surface of the fixing mechanism and the point on the large outer circle of the impeller to ensure that the radial parallelism of each blade is consistent with a preset standard value.

6. The axial flow pump impeller casting correction processing method according to claim 5, characterized in that: During the initial processing of step S300 , when the inner hole of the wheel hub is processed, a first preset margin value is left for the hole diameter of the inner hole of the wheel hub.

7. The axial flow pump impeller casting correction processing method according to claim 6, characterized in that: In step S400, the pressing mechanism includes a pressing plate or an ejector pin, and uses the pressing plate or the ejector pin to press the rear end of the impeller casting after the second correction so that the impeller casting is fixed on the core shaft.

8. The axial flow pump impeller casting correction processing method according to claim 7, characterized in that: After processing the rear end of the wheel hub after the third correction, a second preset margin value is left on the outer diameter of the wheel hub.

9. The axial flow pump impeller casting correction processing method according to claim 8, characterized in that: In step S700, during the finish turning of the impeller casting after the fourth correction, it is also necessary to ensure that the dimensional accuracy and surface roughness of the impeller casting are within the maximum allowable deviation.

10. An axial flow pump impeller casting, characterized in that: The impeller casting of an axial flow pump is prepared by the correction processing method of any one of claims 1 to 9.

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