A processing method and system for statically balancing a cast vane disk
By constructing a static balance unbalance model and a systematic processing method, the problem of insufficient calculation accuracy in the static balance processing of impeller disks was solved, and high-precision adaptability and high pass rate of the parts in the later processing were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AECC AVIATION POWER CO LTD
- Filing Date
- 2023-04-27
- Publication Date
- 2026-06-05
AI Technical Summary
The calculation accuracy of existing bladed disk static balancing methods is insufficient, especially in the subsequent processing, where the new imbalance introduced by the correction cannot be effectively considered, resulting in large calculation errors and insufficient adaptability and accuracy.
By constructing a model to calculate the static imbalance caused by different correction amounts, the basic parameters of the parts are obtained, the initial imbalance is measured, and the correction amount is obtained based on the model for correction processing until the preset requirements are met. The system is processed systematically using a parameter acquisition module, a model construction module, a relationship construction module between imbalance and correction amount, and a static balance measurement module.
It improves the calculation accuracy and pass rate of parts in the later stage of processing, adapts to the imbalance that occurs in the later stage of processing, realizes the dynamic processing of the imbalance of parts, and improves the adaptability and accuracy of calculation.
Smart Images
Figure CN116502361B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of parts casting and processing technology, and relates to a method and system for static balancing of cast crown-bladed disks. Background Technology
[0002] Static balancing of rotating parts in rotary machinery is a process to reduce unbalanced centrifugal inertial forces and ensure smooth machine operation. Therefore, operation requires repeated trial and error, adding counterweights gradually to achieve the desired balance. However, due to the large number of counterweight points, calculation errors are significant when removing or adding weight. A search of domestic and international patent literature revealed a patent on the calculation of impeller static balancing machining allowance (Shanxi Machinery, 1994, Issue 01). This document introduces a method that uses multiple integrals to derive a functional relationship between impeller diameter, static balancing weight, and machining allowance. This method uses multiple integrals, resulting in a large computational load and requiring repeated calculations and experimentation. According to formula 1.5-2 on page 8 of the textbook "Principles of Dynamic Balancing and Dynamic Balancing Machines," the eccentricity e = mr / M. This formula is applicable to static balancing calculations of geometric structures that will not be further machined. Furthermore, the eccentricity correction amount calculated using this formula cannot guarantee the static balancing qualification of the integral impeller after subsequent machining, especially for crowned integral impellers with larger deviations. Application No. 201010159476.1, "A Method for Adjusting the Static Balance of a Cast Integral Bladed Disk," introduces an adjustment method after the initial static balance fails. This method is consistent with the calculation method of "eccentricity e = mr / M" in Formula 1.5-2 on page 8 of "Principles of Dynamic Balancing and Dynamic Balancing Machines." This formula is suitable for static balance calculations of geometric structures that will not be further processed, but not suitable for eccentricity calculations for adjusting static balance during subsequent processing. Summary of the Invention
[0003] The purpose of this invention is to solve the problem that the calculation method for the static balance of blades in the existing bladed disk static balancing treatment method is not accurate enough, has a large amount of calculation, and only considers the imbalance after the initial processing of the part, without considering the new imbalance introduced by the actual part in the later processing after correction. The invention provides a method and system for static balancing of cast crowned bladed disks.
[0004] To achieve the above objectives, the present invention employs the following technical solution:
[0005] A method for static balancing a cast crowned bladed disk includes the following steps:
[0006] S1: Obtain the basic parameters of the part;
[0007] S2: Construct a model to calculate the static balance imbalance caused by different correction amounts;
[0008] S3: Based on the obtained basic parameters of the parts and the constructed model for calculating the static imbalance caused by different correction amounts, calculate the imbalance of the parts and obtain the relationship between the different imbalance amounts and the corresponding correction amounts.
[0009] S4: Measure the initial imbalance of the part to be processed, and obtain the correction amount of the part to be processed based on the relationship between different imbalances and the corresponding correction amount, and perform correction processing on the part based on the correction amount.
[0010] S5: Perform static balance measurement on the parts after the correction treatment until the static balance meets the preset requirements.
[0011] A further improvement of the present invention is that:
[0012] Step S1 includes the following steps:
[0013] The basic parameters of the part to be processed include material density, diameter of the expected machining position on the outer circle, height of the expected machining position on the outer circle, diameter of the expected machining position on the inner circle, and height of the expected machining position on the inner circle.
[0014] Step S2 includes the following steps:
[0015] A model for calculating the static imbalance caused by different correction amounts is constructed using formula (1):
[0016]
[0017] Where ΔM is the mass of the expected removal portion of the outer circle; Δm is the mass of the expected removal portion of the inner circle; G is the weight distance of the expected removal portion of the outer circle; g is the weight distance of the expected removal portion of the inner circle; ρ is the density of the part material; D is the diameter of the expected machining position of the outer circle; H is the height of the expected machining position of the outer circle; d is the diameter of the expected machining position of the inner circle; h is the height of the expected machining position of the inner circle; and e represents the correction amount.
[0018] In step S2, the mass ΔM of the expected portion to be removed during machining of the outer circle is calculated using formula (2):
[0019]
[0020] In step S2, the weight distance G of the expected portion to be removed during machining of the outer circle is calculated using formula (3):
[0021]
[0022] In step S2, the mass ΔM of the expected portion to be removed from the outer circle and the weight G of the expected portion to be removed from the outer circle also satisfy the following conditions:
[0023] ΔM×G=initial imbalance + Δm×g (4)
[0024] Step S3 includes the following steps:
[0025] Based on the basic parameters of the parts and the model constructed to calculate the static imbalance caused by different correction amounts, a curve graph showing the relative changes in the imbalance and correction amounts of the parts is drawn.
[0026] Step S4 includes the following steps:
[0027] Measure the initial imbalance of the part to be processed, and obtain the corresponding correction amount based on the initial imbalance in the curve change graph.
[0028] Step S4 involves correcting the deviation of the part by turning it.
[0029] In step S5, the preset requirements are determined based on the impeller speed, the quality of the parts being processed, and the engine control accuracy level parameters.
[0030] A static balancing system for cast crowned bladed disks includes a parameter acquisition module, a model construction module, a module for constructing the relationship between unbalance and correction, a correction processing module, and a static balancing measurement module.
[0031] The parameter acquisition module is used to acquire the basic parameters of the part.
[0032] The model building module is used to build models that calculate the static balance imbalance caused by different correction amounts.
[0033] The module for constructing the relationship between unbalance and correction amount calculates the unbalance of the part based on the acquired basic parameters of the part and the constructed model for calculating the static balance unbalance caused by different correction amounts, and obtains the relationship between different unbalance amounts and the corresponding correction amounts.
[0034] The deviation correction module measures the initial imbalance of the part to be processed, and obtains the deviation correction amount of the part to be processed based on the relationship between different imbalances and the corresponding deviation correction amount, and performs deviation correction processing on the part based on the deviation correction amount.
[0035] The static balance measurement module is used to perform static balance measurement on the parts after the correction process until the static balance meets the preset requirements.
[0036] Compared with the prior art, the present invention has the following beneficial effects:
[0037] This invention discloses a method for static balancing a cast crown-bladed disk. A model for calculating the unbalance of the part is constructed based on its basic parameters. The unbalance caused by different correction amounts is pre-calculated based on the constructed model. The relationship between different unbalance amounts and correction amounts is then obtained, facilitating the subsequent measurement of the initial unbalance of the part to be processed. The correction amount is obtained based on the initial unbalance, and the part is then further corrected during processing. Measurements are then performed again until the unbalance of the part meets the preset requirements. Compared with existing calculation methods, the method disclosed in this invention considers new unbalances generated during later processing, achieving dynamic processing and calculation of the unbalance. It can adapt to unbalances that occur during later processing, exhibiting high adaptability, considering the influence of different basic parameters of the part on the unbalance, and achieving high accuracy in part calculation.
[0038] Furthermore, the model constructed in this invention considers the machining of the outer and inner diameters of the parts based on the characteristics of the part's complexity, which is closer to the actual machining process of the parts, improving the calculation accuracy of the parts and increasing the pass rate of the parts in the later stages of machining. Attached Figure Description
[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0040] Figure 1 This is a graph showing the relationship between the initial imbalance and the deviation in this invention.
[0041] Figure 2 This is a graph showing the relationship between the initial imbalance and the deviation in Embodiment 1 of the present invention.
[0042] Figure 3 This is a graph showing the relationship between the initial imbalance and the deviation in Embodiment 2 of the present invention. Detailed Implementation
[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0046] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0047] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0048] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.
[0049] The present invention will now be described in further detail with reference to the accompanying drawings:
[0050] See Figure 1 This invention discloses a method for static balancing of cast crowned blade disks, comprising the following steps:
[0051] Step 1: Obtain the basic parameters of the part;
[0052] This includes determining the material density ρ based on the selected part material, and determining the following based on the part position to be machined after initial static equilibrium: the diameter D and height H of the outer circle machining position; and the diameter d and height h of the inner circle machining position.
[0053] Step 2: Construct a model to calculate the static balance imbalance caused by different correction amounts;
[0054] A model for calculating the static imbalance caused by different correction amounts is constructed using formula (1):
[0055]
[0056] Where ΔM is the mass of the expected removal portion of the outer circle; Δm is the mass of the expected removal portion of the inner circle; G is the weight distance of the expected removal portion of the outer circle; g is the weight distance of the expected removal portion of the inner circle; ρ is the density of the part material; D is the diameter of the expected machining position of the outer circle; H is the height of the expected machining position of the outer circle; d is the diameter of the expected machining position of the inner circle; h is the height of the expected machining position of the inner circle; and e represents the correction amount.
[0057] Furthermore, the calculation process for ΔM is as follows:
[0058]
[0059] Furthermore, the calculation process for the weight distance G of the expected machining removal portion of the outer circle is as follows:
[0060]
[0061] Further:
[0062] ΔM×G=initial imbalance + Δm×g (4)
[0063] Step 3: Based on the obtained basic parameters of the parts and the constructed model for calculating the static balance imbalance caused by different correction amounts, calculate the imbalance of the parts and obtain the relationship between the different imbalance amounts and the corresponding correction amounts.
[0064] Based on the above formula, substituting ρ, D, H, d, and h, we assume... Values range from 0 to 2 mm... Similar graphs can be plotted in drawing or statistical software; see [link / reference]. Figure 1 .
[0065] Furthermore, a static balance test was conducted on the cast integral bladed disk with crown for the first time to obtain the initial imbalance of the bladed disk.
[0066] Furthermore, based on the initial imbalance of the impeller obtained after the initial static balancing, the required correction amount can be directly selected from the relationship diagram.
[0067] Step 4: Continue to correct the deviation of the part based on the correction amount;
[0068] This includes the value calculated based on the correction amount, and the turning / machining of the cast crowned integral bladed disk.
[0069] Step 5: Perform static balance measurement on the parts after the correction treatment, and then determine whether the static balance meets the preset requirements.
[0070] This invention also discloses two specific examples, including:
[0071] Example 1
[0072] Step 1:
[0073] The material of a certain crowned integral bladed disc is K417G, and the material density ρ=8g / cm3=0.008g / mm3;
[0074] The positions of the parts to be machined after initial static balancing are determined as follows: the diameter of the outer circle machining position is D = 200 mm, and the height of the outer circle machining position is H = 25 mm; the diameter of the inner circle machining position is d = 100 mm, and the height of the inner circle machining position is h = 75 mm.
[0075] Step 2: Pre-calculate the static balance imbalance caused by different correction amounts.
[0076] Substitute the material density of the part, the diameter of the outer circle machined position, the height of the outer circle machined position, the diameter of the inner circle machined position, and the height of the inner circle machined position into formula (1), assuming... The value is 0–0.15 mm. Similar graphs can be drawn in plotting or statistical software. See [link / reference]. Figure 2 .
[0077] Step 3: Initial Static Equilibrium
[0078] The first static balancing test was conducted on the cast integral bladed disk with crown, and the initial imbalance of the bladed disk was 55g.
[0079] Based on the initial imbalance of the impeller obtained after the first static balancing, the required correction amount e = 0.07 mm is directly selected from the relationship diagram.
[0080] Step 4:
[0081] Based on the correction amount calculated as e = 0.07 mm, the cast crowned integral bladed disk is machined.
[0082] Step 5:
[0083] A static balance test was conducted again on the cast crowned integral bladed disk. The static balance was 1 g·mm < 5 g·mm, which meets the design requirements, and the part is qualified.
[0084] Example 2
[0085] Step 1: The material of a certain uncrowned integral bladed disk is K417G, with a material density ρ = 8 g / cm3 = 0.008 g / mm3. Based on the position of the part to be machined after initial static equilibrium, the following is determined: the outer circle is not machined, and the diameter of the position is D = H = 0 mm; the diameter of the inner circle machined position is d = 100 mm, and the height of the inner circle machined position is h = 120 mm.
[0086] Step 2: Pre-calculate the static balance imbalance caused by different correction amounts.
[0087] Substitute the material density of the part, the diameter of the outer circle machined position, the height of the outer circle machined position, the diameter of the inner circle machined position, and the height of the inner circle machined position into formula (1), assuming... The value is 0–0.15 mm. Similar graphs can be drawn in plotting or statistical software. See [link / reference]. Figure 3 .
[0088] Step 3: Initial Static Equilibrium
[0089] The first static balancing test was conducted on the cast integral bladed disk with crown, and the initial imbalance of the bladed disk was 75g.
[0090] Based on the initial imbalance of the impeller obtained after the first static balancing, the required correction amount e = -0.02 mm is directly selected from the relationship diagram.
[0091] Step 4:
[0092] The cast crowned integral bladed disk was machined based on the value e = -0.02 mm calculated according to the correction amount.
[0093] Step 5:
[0094] A static balance test was conducted again on the cast crowned integral bladed disk. The static balance was 1 g·mm < 5 g·mm, which meets the design requirements, and the part is qualified.
[0095] This invention also discloses a static balancing system for cast crown-bladed disks, including a parameter acquisition module, a model construction module, a module for constructing the relationship between unbalance and correction, a correction processing module, and a static balancing measurement module.
[0096] The parameter acquisition module is used to acquire the basic parameters of the part.
[0097] The model building module is used to build models that calculate the static balance imbalance caused by different correction amounts.
[0098] The module for constructing the relationship between unbalance and correction amount calculates the unbalance of the part based on the acquired basic parameters of the part and the constructed model for calculating the static balance unbalance caused by different correction amounts, and obtains the relationship between different unbalance amounts and the corresponding correction amounts.
[0099] The deviation correction module measures the initial imbalance of the part to be processed, and obtains the deviation correction amount of the part to be processed based on the relationship between different imbalances and the corresponding deviation correction amount, and performs deviation correction processing on the part based on the deviation correction amount.
[0100] The static balance measurement module is used to perform static balance measurement on the parts after the correction process until the static balance meets the preset requirements.
[0101] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for static balancing a cast crowned bladed disk, characterized in that, Includes the following steps: S1: Obtain the basic parameters of the part; S2: Construct a model to calculate the static balance imbalance caused by different correction amounts; S3: Based on the obtained basic parameters of the parts and the constructed model for calculating the static imbalance caused by different correction amounts, calculate the imbalance of the parts and obtain the relationship between the different imbalance amounts and the corresponding correction amounts. S4: Measure the initial imbalance of the part to be processed, and obtain the correction amount of the part to be processed based on the relationship between different imbalances and the corresponding correction amount, and perform correction processing on the part based on the correction amount. S5: Perform static balance measurement on the parts after the correction treatment until the static balance meets the preset requirements. Step S2 includes the following steps: A model for calculating the static imbalance caused by different correction amounts is constructed using formula (1): Where ΔM is the mass of the expected portion to be removed during machining on the outer circle; Δm is the mass of the expected portion to be removed during machining on the inner circle; G is the weight distance of the expected portion to be removed during machining on the outer circle; g is the weight distance of the expected portion to be removed during machining on the inner circle; ρ is the density of the part material; D is the diameter of the expected machining position on the outer circle; H is the height of the expected machining position on the outer circle; d is the diameter of the expected machining position on the inner circle; and h is the height of the expected machining position on the inner circle. This indicates the amount of correction.
2. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, Step S1 includes the following steps: The basic parameters of the part to be processed include material density, diameter of the expected machining position on the outer circle, height of the expected machining position on the outer circle, diameter of the expected machining position on the inner circle, and height of the expected machining position on the inner circle.
3. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, In step S2, the mass ΔM of the expected portion to be removed during machining of the outer circle is calculated using formula (2):
4. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, In step S2, the weight distance G of the expected portion to be removed during machining of the outer circle is calculated using formula (3):
5. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, In step S2, the mass ΔM of the expected portion to be removed from the outer circle and the weight G of the expected portion to be removed from the outer circle also satisfy the following conditions:
6. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, Step S3 includes the following steps: Based on the basic parameters of the parts and the model constructed to calculate the static imbalance caused by different correction amounts, a curve graph showing the relative changes in the imbalance and correction amounts of the parts is drawn. Step S4 includes the following steps: Measure the initial imbalance of the part to be processed, and obtain the corresponding correction amount based on the initial imbalance in the curve change graph.
7. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, Step S4 involves correcting the deviation of the part by turning it.
8. The method for static balancing of a cast crown-bladed disk according to claim 1, characterized in that, In step S5, the preset requirements are determined based on the impeller speed, the quality of the parts being processed, and the engine control accuracy level parameters.
9. The static balancing system for cast crown-bladed disks according to claim 1, characterized in that, It includes a parameter acquisition module, a model building module, a module for constructing the relationship between unbalance and correction quantities, a correction processing module, and a static balance measurement module; The parameter acquisition module is used to acquire the basic parameters of the part. The model building module is used to build models that calculate the static balance imbalance caused by different correction amounts. The module for constructing the relationship between unbalance and correction amount calculates the unbalance of the part based on the acquired basic parameters of the part and the constructed model for calculating the static balance unbalance caused by different correction amounts, and obtains the relationship between different unbalance amounts and the corresponding correction amounts. The deviation correction module measures the initial imbalance of the part to be processed, and obtains the deviation correction amount of the part to be processed based on the relationship between different imbalances and the corresponding deviation correction amount, and performs deviation correction processing on the part based on the deviation correction amount. The static balance measurement module is used to perform static balance measurement on the parts after the correction process until the static balance meets the preset requirements.