A method of machining a stator blade

Abstract

The application discloses a stator blade processing method, which comprises the following steps: cutting and processing a blade tip groove one and a blade tip processing groove two on both sides of the front end of the blade tip part of a blade blank; cutting and processing a blade root groove one and a blade root processing groove two on both sides of the rear end of the blade root part of the blade blank; cutting off the blade tip along the connecting line of the groove bottoms of the blade tip groove one and the blade tip processing groove two, and cutting off the blade root along the connecting line of the groove bottoms of the blade root groove one and the blade root processing groove two to obtain a first piece of blade; extracting the surface feature points of the blade tip and the surface feature points of the blade root of the first piece of blade to obtain the coordinate values of the surface feature points of the blade tip and the coordinate values of the surface feature points of the blade root; and cutting the blade blank in batches according to the coordinate values of the surface feature points of the blade tip and the coordinate values of the surface feature points of the blade root to obtain the stator blades processed in batches; and the application can accurately evaluate the cutting-off positions of the blade tip and the blade root, and avoid the over-difference or scrapping of the blade caused by the deviation of the cutting-off positions.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine compressor technology, and relates to a stator blade processing technology for aero-engine compressors, and particularly to a stator blade processing method. Background Technology

[0002] As attached Figure 1 As shown, the stator blade of a certain type of aero-engine compressor includes a blade tip 1, a blade body 2, and a blade root 3. The blade tip 1 comprises three surface sections, and the blade root 3 has a stepped structure. This type of stator blade is without a mounting plate. Currently, the main processing methods for stator blades without mounting plates include: precision forging, die forging of blanks or plates; specifically, the blade body profile is first precision forged, rolled, or machined, and finally the blade tip and root are cut off. (See attached image) Figure 2 As shown, before the stator blade is cut, the extension section of the blade tip 1 is the first process boss 4, and the extension section of the blade root 3 is the second process boss 5; wherein, the end face 6 of the second process boss 5 is the reference of the blade along the stacking axis direction.

[0003] Currently, existing stator blades without mounting plates are often cut using wire EDM. Specifically, the blade tip and root are cut directly in one clamping operation. The cutting position along the stacking axis is guaranteed by the program. After cutting, the length of the material head, i.e., the length of the second process boss 5, is used to evaluate the accuracy of the cutting position. However, due to the material loss caused by wire EDM, the length of the material head cannot accurately evaluate the accuracy of the cutting position. This can easily lead to deviations in the cutting position, resulting in blade dimensions exceeding tolerances or scrapping. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides a stator blade processing method to solve the technical problem that the cutting position is prone to deviation during the wire EDM processing of stator blades without mounting plates, resulting in blade dimensional deviation or scrap.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a method for processing stator blades, comprising:

[0007] First blade machining:

[0008] Cut and machine the first and second blade tip grooves on both sides of the front end of the blade tip of the blade blank, and cut and machine the first and second blade root grooves on both sides of the rear end of the blade root of the blade blank.

[0009] Among them, after the first blade tip groove and the second blade tip machining groove are cut and processed, the surface machining of the blade tip feature dimensions of the first blade is completed;

[0010] Cut the blade tip along the line connecting the bottom of the first blade tip groove and the second blade tip groove; cut the blade root along the line connecting the bottom of the first blade root groove and the second blade root groove. At this point, the surface processing of the characteristic dimensions of the blade root of the first blade is completed, and the first blade is obtained.

[0011] Feature point extraction:

[0012] The feature points on the tip and root surfaces of the first blade are extracted to obtain the coordinate values ​​of the feature points on the tip and root surfaces.

[0013] Batch processing:

[0014] Based on the coordinate values ​​of the feature points on the blade tip surface and the feature points on the blade root surface, the blade blanks are batch-cut to obtain batch-processed stator blades.

[0015] Furthermore, the blade blank is a blank with a blade profile processed into it.

[0016] Furthermore, the first blade tip machining groove and the second blade tip machining groove are respectively located on both sides of the stacking axis of the stator blade, and are located between the first process boss of the blade blank and the blade tip of the blade blank.

[0017] Furthermore, the surface features of the first blade tip machining groove near the blade body portion of the blade blank are the same as the surface features of the tip portion of the stator blade, and the surface features of the second blade tip machining groove near the blade body portion of the blade blank are the same as the surface features of the other side of the tip portion of the stator blade.

[0018] Furthermore, during the process of cutting the blade tip along the line connecting the bottom of the first blade tip groove and the second blade tip processing groove, the line connecting the bottom of the first blade tip groove and the second blade tip processing groove coincides with the middle surface of the blade tip.

[0019] Furthermore, the first and second blade root processing grooves are located on both sides of the stacking axis of the stator blade, and are located between the second process boss of the blade blank and the blade root of the blade blank.

[0020] Furthermore, the surface features of the first groove at the blade root, near the blade body portion of the blade blank, are the same as the surface features of the root side of the stator blade, and the surface features of the second groove at the blade root, near the blade body portion of the blade blank, are the same as the surface features of the other side of the root of the stator blade.

[0021] Furthermore, during the process of cutting the leaf root along the line connecting the bottom of the first groove at the leaf root and the second groove at the leaf root, the line connecting the bottom of the first groove at the leaf root and the second groove at the leaf root coincides with the surface of the leaf root step.

[0022] Furthermore, both the first blade tip groove and the second blade tip machining groove are cut using wire cutting technology.

[0023] Furthermore, both the first groove at the leaf root and the second groove at the leaf root are cut using wire cutting technology.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention provides a method for machining stator blades. First, two tip grooves are cut on both sides of the front end of the blade tip of the blade blank, and the characteristic dimensions of the blade tip are machined by cutting the tip grooves. Then, the blade tip is finally cut off along the line connecting the bottom of the two tip grooves. Next, two root grooves are cut on both sides of the rear end of the blade root of the blade blank, and the root is finally cut off along the line connecting the bottom of the two root grooves, thus obtaining the characteristic dimensions of the root. Then, the tip and root surface feature points of the first blade are extracted, and the stator blades are batch machined based on these feature points. During the machining process, the cutting position of the blade tip and root can be accurately evaluated to ensure that the cutting position meets the design requirements and avoids deviation of the cutting position that causes the blade to exceed tolerances or be scrapped, thereby improving the machining accuracy and efficiency of the stator blades. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the stator blades of a certain type of aero-engine;

[0027] Figure 2 This is a schematic diagram of the structure of a certain type of aero-engine compressor before the stator blades are cut off.

[0028] Figure 3 This is a schematic diagram illustrating the machining of the first groove of the stator blade of a certain type of aero-engine in the embodiment;

[0029] Figure 4 This is a schematic diagram of the final cutting of the first stator blade of a certain type of aero-engine in the embodiment.

[0030] Figure 5 This is a schematic diagram of the batch cutting of stator blades of a certain type of aero-engine in an embodiment.

[0031] Among them, 1 is the blade tip, 2 is the blade body, 3 is the blade root, 4 is the first process boss, 5 is the second process boss, 6 is the end face of the second process boss; 7 is the first machining groove at the blade tip, 8 is the first machining groove at the blade root, 9 is the second machining groove at the blade root, 10 is the second machining groove at the blade tip, 11 is the middle surface of the blade tip, and 12 is the step surface of the blade root. Detailed Implementation

[0032] To make the technical problems solved, the technical solutions, and the beneficial effects of the present invention clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0033] This invention provides a method for machining stator blades, used in the machining process of stator blades for a certain type of aero-engine compressor; wherein, the method for machining stator blades includes the following steps:

[0034] Step 1: Machining of the first blade

[0035] A first blade tip groove 7 and a second blade tip groove 10 are cut and machined on both sides of the front end of the blade tip of the blade blank. A first blade root groove 8 and a second blade root groove 9 are cut and machined on both sides of the rear end of the blade root of the blade blank. After the first blade tip groove 7 and the second blade tip groove 10 are cut and machined, the characteristic dimension surface of the blade tip 1 of the first blade is completed. The blade tip 1 is cut off along the line connecting the bottom of the first blade tip groove 7 and the second blade tip groove 10. The blade root 3 is cut off along the line connecting the bottom of the first blade root groove 8 and the second blade root groove 9. At this time, the characteristic dimension surface of the blade root of the first blade is completed, and the first blade is obtained.

[0036] Specifically, the processing of the first blade includes the following steps:

[0037] Step 11: Groove machining of the first blade; the groove machining process is as follows:

[0038] Step 111: Cut and machine the first blade tip groove 7 and the second blade tip machining groove 10 on both sides of the front end of the blade tip of the blade blank; wherein, after the first blade tip groove 7 and the second blade tip machining groove 10 are cut and machined, the characteristic dimension surface of the blade tip 1 of the first blade is completed; wherein, the blade blank is a blank with a blade body profile, and the processing of the blade blank is the same as the existing blank processing process, which will not be described again here.

[0039] It should be noted that the first blade tip machining groove 7 and the second blade tip machining groove 10 are located on both sides of the stacking axis of the stator blade, and between the first process boss 4 of the blade blank and the blade tip of the blade blank; the surface features of the first blade tip machining groove 7 on the side near the blade body of the blade blank are the same as the surface features of the blade tip of the stator blade, and the surface features of the second blade tip machining groove 10 on the side near the blade body of the blade blank are the same as the surface features of the other side of the blade tip of the stator blade; preferably, the first blade tip groove 7 and the second blade tip machining groove 10 are both cut by wire cutting process.

[0040] Step 112: Cut and process the first leaf root groove 8 and the second leaf root processing groove 9 on both sides of the rear end of the leaf root of the blade blank; wherein, after the first leaf root groove 8 and the second leaf root processing groove 9 are cut and processed, the surface of the characteristic dimensions of the leaf root 3 of the first blade is completed.

[0041] It should be noted that the first blade root processing groove 8 and the second blade root processing groove 9 are located on both sides of the stacking axis of the stator blade, and between the second process boss 5 of the blade blank and the blade root of the blade blank; the surface features of the first blade root processing groove 8 on the side near the blade body of the blade blank are the same as the surface features of the blade root side of the stator blade, and the surface features of the second blade root processing groove 9 on the side near the blade body of the blade blank are the same as the surface features of the other side of the blade root of the stator blade; preferably, the first blade root groove 8 and the second blade root processing groove 9 are both cut by wire cutting process.

[0042] Step 12: Groove inspection of the first blade

[0043] The feature dimensions of the first blade tip groove 7 and the second blade tip machining groove 10 are detected so that the surface features of the first blade tip machining groove 7 on the side of the blade body near the blade blank are the same as the surface features of the blade tip side of the stator blade, and the surface features of the second blade tip machining groove 10 on the side of the blade body near the blade blank are the same as the surface features of the blade tip side of the stator blade.

[0044] The characteristic dimensions of the first groove 8 at the blade root and the second groove 9 at the blade root are detected so that the surface features of the first groove 8 at the blade root are the same as the surface features of the root side of the stator blade, and the surface features of the second groove 9 at the blade root are the same as the surface features of the other side of the root of the stator blade.

[0045] Step 13: Cut the first blade

[0046] Cut the blade tip 1 along the line connecting the bottom of the first blade tip groove 7 and the second blade tip processing groove 10, and cut the blade root 3 along the line connecting the bottom of the first blade root groove 8 and the second blade root processing groove 9 to obtain the first blade. It should be noted that the line connecting the bottom of the first blade tip groove 7 and the second blade tip processing groove 10 coincides with the middle surface 11 of the blade tip, and the line connecting the bottom of the first blade root groove 8 and the second blade root processing groove 9 coincides with the surface 12 of the blade root step.

[0047] Step 14: Final inspection of the first blade

[0048] The characteristic dimensions of the tip and root of the first blade are inspected to ensure that the characteristic dimensions of the tip and root are the same as the design dimensions of the tip and root of the stator blade.

[0049] Step 2: Feature Point Extraction

[0050] Feature points on the tip and root surfaces of the first blade are extracted to obtain their coordinate values. Specifically, the coordinate values ​​of the feature points of the tip and root surfaces are extracted first, then the coordinate values ​​of the feature points of the tip groove 7, the tip groove 10, the root groove 8, and the root groove 9 are extracted. Then, the coordinate values ​​of the feature points of the tip middle surface 11 and the root step surface 12 are extracted.

[0051] Step 3: Batch cutting and processing

[0052] Based on the coordinate values ​​of the feature points on the blade tip surface and the feature points on the blade root surface, the blade blank is batch-cut to obtain batch-processed stator blades; specifically, based on the coordinate values ​​of the feature points on the blade tip surface and the feature points on the blade root surface, the blade tip and blade root of the blade blank are directly cut off, thus batch-processing to obtain stator blades.

[0053] Step 4: Conduct quality inspection on the batch-processed stator blades; specifically, inspect the characteristic dimensions of the blade tip and blade root of the batch-processed stator blades.

[0054] Processing principle:

[0055] The stator blade processing method of this invention involves first processing the first blade, and then, based on the extracted coordinate values ​​of the blade tip and root feature points of the first blade, performing batch cutting processing on the blade blanks. Specifically, firstly, two blade tip grooves are cut on both sides of the front end of the blade tip of the blade blank, and the surface processing of the blade tip feature dimensions is completed through the cutting of the blade tip grooves. Then, the blade tip is finally cut off along the line connecting the bottoms of the two blade tip grooves. Secondly, two blade root grooves are cut on both sides of the rear end of the blade root of the blade blank, and the blade root is finally cut off along the line connecting the bottoms of the two blade root grooves. At this point, the first blade... After the surface processing of the blade root feature dimensions is completed, the first stator blade is obtained. Next, the surface feature points of the blade tip and the blade root of the first blade are extracted, and the stator blades are processed in batches based on these feature points. During batch processing, the blade tip and the blade root are directly cut off on the blade blank based on the surface feature points of the blade tip and the blade root of the first blade. It should be noted that during batch processing, steps 1-2 are repeated according to a preset sampling rate to ensure that the cutting position of the blade tip and the blade root does not deviate during batch processing.

[0056] Example

[0057] Taking the processing of stator blades of a certain type of aero-engine compressor as an example; wherein, the material of the stator blades of the aero-engine compressor is GH4169.

[0058] This embodiment provides a method for processing stator blades, including the following steps:

[0059] Step 1: Groove machining of the first blade

[0060] On the upper side of the blade tip of the blade blank, along the line connecting feature points A, B, C, D, E, and F, a blade tip groove 7 is machined using wire cutting technology; on the lower side of the blade tip of the blade blank, along the line connecting feature points O, P, Q, and R, a blade tip groove 20 is machined using wire cutting technology, as shown in the attached figure. Figure 3 As shown.

[0061] On the upper rear end of the blade root of the blade blank, along the line connecting feature points G, H, I, and J, a blade root groove 8 is machined using wire cutting technology; on the lower rear end of the blade root of the blade blank, along the line connecting feature points K, L, M, and N, a blade root groove 9 is machined using wire cutting technology, as shown in the attached figure. Figure 3 As shown.

[0062] The blade blank is a blank with a blade profile. The processing of the blade blank is the same as the existing blank processing process, and will not be described again here. In step 1, after the blade tip groove 1 7 and the blade tip groove 2 10 are processed, the blade tip of the stator blade is connected to the first process boss 4 of the blade blank through the bottom of the two blade tip grooves, that is, the blade tip of the stator blade is not completely cut off. Similarly, after the blade root groove 1 8 and the blade root groove 2 9 are processed, the blade root of the stator blade is connected to the second process boss 5 of the blade blank through the bottom of the two blade root grooves, that is, the blade root of the stator blade is not completely cut off.

[0063] It should be noted that after the wire cutting of the first blade tip groove 7 and the second blade tip machining groove 10, the surface features of the blade tip 1 of the first blade are completed. Specifically, the surface features of the first blade tip machining groove 7 on the side near the blade body of the blade blank are the same as the surface features of the blade tip of the stator blade, and the surface features of the second blade tip machining groove 10 on the side near the blade body of the blade blank are the same as the surface features of the other side of the blade tip of the stator blade. That is, the three surfaces represented by line segments FE, EP, and PO are the surface features of the blade tip 1 on the stator blade. Feature points A, B, and E are at the same distance from the stacking axis; similarly, after the first blade root machining groove 8 and the second blade root machining groove 9 are wire-cut, the surface features of the first blade root machining groove 8 near the blade body of the blade blank are the same as the surface features of the stator blade near the blade root, and the surface features of the second blade root machining groove 9 near the blade body of the blade blank are the same as the surface features of the stator blade near the other side of the blade root; that is, the profiles represented by line segments GH, HI, LM, and MN are the feature dimension surfaces of the blade root 3 on the stator blade.

[0064] Step 2: Groove inspection of the first blade

[0065] The characteristic dimensions of the first blade tip groove 7 and the second blade tip machining groove 10 are inspected to ensure that the surface characteristics of the first blade tip machining groove 7 on the side of the blade blank near the blade body are the same as the surface characteristics of the stator blade tip side, and the surface characteristics of the second blade tip machining groove 10 on the side of the blade blank near the blade body are the same as the surface characteristics of the other side of the stator blade tip. Specifically, the characteristic dimensions of segments AB, DE, and EF of the first blade tip groove 7 are inspected, and the characteristic dimensions of segments OP and PQ of the second blade tip groove 10 are inspected to ensure that the characteristic dimensions of each segment conform to the design values ​​of the stator blade.

[0066] The characteristic dimensions of the first blade root groove 8 and the second blade root machining groove 9 are inspected to ensure that the surface characteristics of the first blade root machining groove 8 on the side of the blade blank near the blade body are the same as the surface characteristics of the stator blade on the root side, and the surface characteristics of the second blade root machining groove 9 on the side of the blade blank near the blade body are the same as the surface characteristics of the other side of the stator blade root. Specifically, the characteristic dimensions of the GH and HI segments of the first blade root groove 8 are inspected, and the characteristic dimensions of the LM and MN segments of the second blade root groove 9 are inspected to ensure that the characteristic dimensions of each segment conform to the design values ​​of the stator blade.

[0067] After the above feature dimensions pass the inspection, the coordinate values ​​of feature points E, F, G, H, M, N, O, and P are determined.

[0068] Step 3: Cut the first blade

[0069] As attached Figure 4 As shown, the blade tip 1 is cut off along the line connecting the bottom of the first groove 7 and the second groove 10 of the blade tip; the blade root 3 is cut off along the line connecting the bottom of the first groove 8 and the second groove 9 of the blade root, thus obtaining the first blade.

[0070] Specifically, the blade tip 1 is cut along the line connecting feature point E and feature point P; the position of feature point T is determined at the bottom of the groove 8 at the blade root, and the position of feature point S is determined at the bottom of the groove 9 at the blade root; wherein the line connecting feature point T and feature point S coincides with the surface 12 of the blade root step; then, the blade root 3 is cut along the line connecting feature point T and feature point S.

[0071] Step 4: Final inspection of the first blade

[0072] The characteristic dimensions of the tip and root of the first blade are inspected to ensure that the characteristic dimensions of the tip and root are the same as the design dimensions of the tip and root of the stator blade. Specifically, the characteristic dimensions of the cut tip 1 and root 3 are inspected. If the inspection is qualified, the coordinate values ​​of characteristic point T and characteristic point S are determined.

[0073] Step 5: Batch cutting and processing

[0074] As attached Figure 5 As shown, based on the coordinates of feature points E, F, G, H, M, N, O and P determined in step 2, and the coordinates of feature points T and S determined in step 4, the blade tip and root of the blade blank are directly cut off, thus batch processing is carried out to obtain stator blades.

[0075] Step 6: Perform quality inspection on the batch-processed stator blades; specifically, inspect the characteristic dimensions of the blade tip and blade root of the batch-processed stator blades.

[0076] It should be noted that during the batch cutting process, steps 1-4 are repeated according to the preset sampling rate to ensure that the cutting positions of the blade tip and blade root do not deviate during the batch cutting process.

[0077] The stator blade processing method described in this invention, compared to the traditional method of directly cutting the blade root and tip of a stator blade without a mounting plate and then determining the cutting position by detecting the length of the cutting head, adopts a method of first trial-cutting the main feature surfaces of the blade, determining the coordinate values ​​of the feature points after the feature surface dimensions are qualified, and then batch processing based on the coordinate values ​​of the feature points. This method can accurately evaluate the cutting position, avoid deviation of the cutting position causing the blade to exceed tolerances or be scrapped, effectively ensure the processing quality of the stator blade, and greatly reduce the processing cost of the blade.

[0078] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A method for processing stator blades, characterized in that, include: First blade machining: Cut and process the first (7) and the second (10) blade tip grooves on both sides of the front end of the blade tip of the blade blank. Cut and process the first (8) and the second (9) blade root grooves on both sides of the rear end of the blade root of the blade blank. After the blade tip groove one (7) and the blade tip processing groove two (10) are cut and processed, the surface processing of the characteristic dimensions of the blade tip (1) of the first blade is completed; Cut the blade tip (1) along the line connecting the bottom of the first groove (7) and the second groove (10) of the blade tip; cut the blade root (3) along the line connecting the bottom of the first groove (8) and the second groove (9) of the blade root. At this time, the surface processing of the characteristic dimensions of the blade root of the first blade is completed, and the first blade is obtained. Feature point extraction: The feature points on the tip and root surfaces of the first blade are extracted to obtain the coordinate values ​​of the feature points on the tip and root surfaces. Batch processing: Based on the coordinate values ​​of the feature points on the blade tip surface and the feature points on the blade root surface, the blade blanks are batch-cut to obtain batch-processed stator blades. During batch processing, the first blade processing and feature point extraction operations are repeated according to the preset sampling rate to ensure that the cutting positions of the blade tip and blade root do not deviate during batch processing.

2. The method for processing stator blades according to claim 1, characterized in that, The blade blank is a blank with a blade profile.

3. The method for processing stator blades according to claim 1, characterized in that, The first (7) and the second (10) of the blade tip processing groove are located on both sides of the stacking axis of the stator blade, and are located between the first process boss (4) of the blade blank and the blade tip of the blade blank.

4. The method for processing stator blades according to claim 3, characterized in that, The surface features of the first (7) blade tip processing groove near the blade body of the blade blank are the same as the surface features of the tip of the stator blade. The surface features of the second (10) blade tip processing groove near the blade body of the blade blank are the same as the surface features of the tip of the stator blade.

5. The method for processing stator blades according to claim 1, characterized in that, During the process of cutting the blade tip (1) along the line connecting the bottom of the first (7) and the second (10) of the blade tip, the line connecting the bottom of the first (7) and the second (10) of the blade tip coincides with the middle surface (11) of the blade tip.

6. The method for processing stator blades according to claim 1, characterized in that, The first (8) and the second (9) of the blade root processing groove are located on both sides of the stacking shaft of the stator blade, and are located between the second process boss (5) of the blade blank and the blade root of the blade blank.

7. A method for processing stator blades according to claim 6, characterized in that, The surface features of the first groove (8) at the root of the blade near the blade body part of the blade blank are the same as the surface features of the root side of the stator blade. The surface features of the second groove (9) at the root of the blade near the blade body part of the blade blank are the same as the surface features of the other side of the root of the stator blade.

8. The method for processing stator blades according to claim 1, characterized in that, During the process of cutting the leaf root (3) along the line connecting the bottom of the first groove (8) and the second groove (9) of the leaf root, the line connecting the bottom of the first groove (8) and the second groove (9) of the leaf root coincides with the surface (12) of the leaf root step.

9. A method for processing stator blades according to claim 1, characterized in that, Both the first (7) groove at the blade tip and the second (10) groove at the blade tip are cut using wire cutting technology.

10. A method for processing stator blades according to claim 1, characterized in that, Both the leaf root groove one (8) and the leaf root machining groove two (9) are cut by wire cutting process.

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