CN116475681A - Method for repairing wear-resistant layer of turbine sawtooth crown switching R region - Google Patents
Method for repairing wear-resistant layer of turbine sawtooth crown switching R region Download PDFInfo
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- CN116475681A CN116475681A CN202310154999.4A CN202310154999A CN116475681A CN 116475681 A CN116475681 A CN 116475681A CN 202310154999 A CN202310154999 A CN 202310154999A CN 116475681 A CN116475681 A CN 116475681A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012546 transfer Methods 0.000 claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 22
- 230000007797 corrosion Effects 0.000 claims abstract description 22
- 230000007704 transition Effects 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000005530 etching Methods 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 6
- 229910003460 diamond Inorganic materials 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 210000000332 tooth crown Anatomy 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a method for repairing a wear-resistant layer in an R region of a turbine sawtooth crown transition, which comprises the following steps: step one, preparing a local corrosion solution, and performing corrosion operation through the corrosion solution to confirm the boundary between the wear-resistant layer and the matrix; step two, measuring the size of the boundary line, and classifying the severity of the intrusion of the wear-resistant layer into the transfer R area according to the measured size; step three, a restoration contour scheme is formulated according to the classification result of the step two; step four, intensity calculation is carried out on the formulated restoration profile scheme; step five, machining the sawtooth crown switching R region according to a restoration contour scheme conforming to strength calculation; and step six, checking the repairing effect of the sawtooth crown transfer R region processed in the step five. The embodiment of the invention can effectively repair the blade with the welding out-of-tolerance, and avoid the situation that the product is scrapped in batches.
Description
Technical Field
The invention relates to the technical field of aeroengines, in particular to a method for repairing a wear-resistant layer in an R region of a turbine sawtooth crown transition.
Background
The saw tooth crown is an important structural feature of the turbine working blade with large aspect ratio for inhibiting vibration and avoiding high cycle fatigue failure, and the working surfaces on the two sides of the basin and the back are usually provided with hard alloy with a certain thickness so as to improve the service life of the local position, and the saw tooth crown is usually realized by adopting a process route of machining after the wear-resistant material is deposited on the working surface directly. On one hand, the surfacing material has high hardness and good wear resistance, and can effectively improve the reliability of a working surface; on the other hand, the material has poor tensile property, and when the surfacing material enters a region with high tensile stress (such as the surface of the transfer R region), cracking and even chipping are easily generated. In practical development work, the boundary between the solder and the substrate is difficult to accurately control because the argon arc welding process is limited by the skill of operators. The out-of-tolerance of the wear layer build-up welding is generally batch, which is necessary for repairing the stock product, so how to effectively remove the wear layer which invades the large tensile stress area (switching R area) and ensure that the strength and the service life of the blade are not obviously weakened is a difficult problem of the repair work.
Disclosure of Invention
In view of the above, the invention provides a method for repairing the wear-resistant layer of the turbine sawtooth crown transfer R region, so as to achieve the purpose of effectively repairing the blade with ultra-poor welding.
The technical scheme of the invention is as follows: a method for repairing a wear-resistant layer in a turbine sawtooth crown transfer R region comprises the following steps: step one, preparing a local corrosion solution, and performing corrosion operation through the corrosion solution to confirm the boundary between the wear-resistant layer and the matrix; step two, measuring the size of the boundary line, and classifying the severity of the intrusion of the wear-resistant layer into the transfer R area according to the measured size; step three, a restoration contour scheme is formulated according to the classification result of the step two; step four, intensity calculation is carried out on the formulated restoration profile scheme; step five, machining the sawtooth crown switching R region according to a restoration contour scheme conforming to strength calculation; and step six, checking the repairing effect of the sawtooth crown transfer R region processed in the step five.
Further, the local etching solution in the first step is prepared from HCl and FeCl 3 .6H 2 O, wherein the concentration of HCl is 91-126 g/L, feCl 3 .6H 2 The concentration of O is 242-300 g/L.
Further, the etching time of the local etching solution in the first step is 20-90S, and the etching temperature is 20-25 ℃.
Further, before the first step, the method further comprises the following steps: absolute ethyl alcohol or acetone is used for removing oil near the flow passage surface of the transfer R area; and shielding and protecting the non-corrosion detection area.
Further, the distance from the intersection point of the dividing line and the switching R region to the non-working surface is X, and the maximum thickness dimension of the wear-resistant layer in the range of the switching R region is Y; the second step is specifically as follows: when Y is more than or equal to 2 or X is less than or equal to 0, classifying the blades into a first type; when Y is more than or equal to 1.2 and less than 2 or X is more than or equal to 0 and less than or equal to 0.5, classifying the blades into a second class; when Y < 1.2 or X > 0.5, the blades are classified into a third class.
Further, when the blade is of the first type, the repair profile scheme is specifically: the included angle alpha between the working face side straight line segment of the repaired contour and the working face is 20-30 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
Further, when the blade is of the second type, the repair profile scheme is specifically: the included angle alpha between the working face side straight line segment of the repaired contour and the working face is 30-50 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
Further, when the blade is of the third type, the repair profile scheme is specifically: the included angle alpha range between the working face side straight line segment of the repaired profile and the working face is alpha > 20 degrees, and the distance between the wear-resistant layer and the repaired switching R area is d 0.1.
Further, the fourth step is specifically: and adopting average equivalent stress of the cross section to evaluate the permanent strength reserve, and meeting the design requirement of the engine strength when the evaluation result is more than 1.3.
Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least: the embodiment of the invention can ensure that the interfaces of the abrasion-resistant layer and the matrix near the R area of the sawtooth crown and the working surface can be clearly and accurately distinguished, then the large-stress area is transferred to a position far away from the solder by a modeling design method of a plurality of sections of arcs, and the accuracy of processing is ensured by customizing the grinding processing method of the diamond grinding wheel, so that the blade with ultra-poor welding is effectively repaired, and the condition of batch scrapping of products is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a turbine serration crown;
FIG. 2 is a view in the direction K of FIG. 1;
FIG. 3 is an enlarged view of portion A of FIG. 2;
fig. 4 is a schematic diagram of a repair scenario.
Reference numerals in the drawings: 1. the wear-resistant layer is in boundary with the matrix; 2. a working surface; 3. a non-working surface; 4. switching the R area; 5. a wear-resistant layer; 6. a base; 7. a new switching R region; 8. a flow path surface.
Detailed Description
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
As shown in fig. 1 to 3, an embodiment of the present invention provides a method for repairing a wear-resistant layer in a transition R region of a turbine sawtooth crown, including:
step one, preparing a local corrosion solution, and performing corrosion operation through the corrosion solution to confirm the boundary between the wear-resistant layer and the matrix;
step two, measuring the size of the boundary line, and classifying the severity of the intrusion of the wear-resistant layer into the transfer R area according to the measured size;
step three, a restoration contour scheme is formulated according to the classification result of the step two;
step four, intensity calculation is carried out on the formulated restoration profile scheme;
step five, machining the sawtooth crown switching R region according to a restoration contour scheme conforming to strength calculation;
and step six, checking the repairing effect of the sawtooth crown transfer R region processed in the step five.
The embodiment of the invention can ensure that the interfaces of the abrasion-resistant layer and the matrix near the R area of the sawtooth crown and the working surface can be clearly and accurately distinguished, then the large-stress area is transferred to a position far away from the solder by a modeling design method of a plurality of sections of arcs, and the accuracy of processing is ensured by customizing the grinding processing method of the diamond grinding wheel, so that the blade with ultra-poor welding is effectively repaired, and the condition of batch scrapping of products is avoided.
The method further comprises the following steps before the first step: using absolute ethyl alcohol or acetone to remove oil near the flow passage surface 8 of the transfer R region 4; meanwhile, masking and protecting the non-corrosion detection area by using adhesive tape and the like; the criterion for testing the corrosion effect is that there is a visually distinguishable distinct boundary between the weld deposit area and the substrate 6 in the corrosion area.
Further, the first step comprises the steps of adjusting the chemical component content of the etching solution, carrying out local etching operation on a plurality of samples, carrying out metallographic examination analysis on an etching area, and observing the state of the etched surface to determine the formula of the etching solution.
Corrosion by corrosionThe solution formula is hydrochloric acid HCl (91-126 g/L), ferric chloride FeCl 3 .6H 2 O (242-300 g/L), etching time is 20-90s, when the temperature is room temperature (20-25 ℃), the surface of the corroded area of the sample has no obvious defect, and the corrosion layer is 1 mu m (which can be removed by clamping later).
The first step further comprises locally wiping and corroding the channel surface 8 near the sawtooth crown transition R region 4 to enable the base body 6 and the solder 5 to be in different colors under the corrosive liquid, so that the color is visually distinguished to confirm the parting line 1 of the wear-resistant layer and the base body.
The second step is specifically as follows: and the size measurement is carried out on the boundary line 1 between the wear-resistant layer and the matrix by a caliper or three coordinates and the like, and the outline size of the boundary line 1 between the wear-resistant layer and the matrix near the transfer R area 4 is recorded and measured in a key way. And the severity of intrusion of the wear layer 5 into the transition R-zone 4 is classified based on the dimensional measurements.
Further, the distance from the intersection point of the dividing line and the switching R area 4 to the non-working surface 3 is X, and the maximum thickness dimension of the wear-resistant layer in the range of the switching R area 4 is Y; the second step is specifically as follows:
when Y is more than or equal to 2 or X is less than or equal to 0, classifying the blades into a first type;
when Y is more than or equal to 1.2 and less than 2 or X is more than or equal to 0 and less than or equal to 0.5, classifying the blades into a second class;
when Y < 1.2 or X > 0.5, the blades are classified into a third class.
The third step is specifically as follows: when the blade is of a first type, the repairing contour scheme specifically comprises the following steps: the included angle alpha range between the working face side straight line section of the repaired contour and the working face 2 is 20-30 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
When the blade is of the second type, the repairing contour scheme specifically comprises the following steps: the included angle alpha range between the working face side straight line section of the repaired contour and the working face 2 is 30-50 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
When the blade is of the third type, the repairing contour scheme specifically comprises the following steps: the included angle alpha range between the working face side straight line section of the repaired profile and the working face 2 is alpha > 20 degrees, and the distance between the wear-resistant layer and the repaired switching R area is d 0.1.
And (3) formulating different repairing schemes according to the classifying results, so that the repaired transfer R region 4 is not covered by the wear-resistant layer 5. Regarding the selection of the repaired outline size, the smaller the grinding amount is, the larger the arc radius is, the smaller the local equivalent stress of the repaired area is, and the strength and the service life of the repaired area are improved.
And fourthly, performing intensity and vibration calculation on each repair scheme model, and meeting the design requirement of the engine intensity. The method is characterized in that average equivalent stress of a cross section is adopted for carrying out permanent strength storage evaluation, the cross section is selected in a mode that the cross section is taken along the diameter direction and the tangential direction through the point of maximum equivalent stress, and the width of the cross section is equal to the diameter of the switching R region 4. And calculating the obtained persistent strength reserve, and meeting the strength design requirement of the engine when the evaluation result is more than 1.3.
The fifth step is specifically as follows: and manufacturing a corresponding diamond grinding wheel according to the repairing scheme, and performing formal machining on the sawtooth crown switching R region 4 in a grinding machining mode. The geometric dimension of the diamond grinding wheel is consistent with the designated repairing outline, and the diamond grinding wheel is integrally formed by processing through a creep feed grinder.
The sixth step is specifically as follows: after finishing grinding, visually inspecting the boundary between the wear-resistant layer 5 and the matrix 6, and ensuring that the boundary is far away from the new transfer R region 7. The specific inspection method is to observe the boundary line 1 between the wear-resistant layer and the matrix from the direction of the flow path surface 8 of the blade shroud by naked eyes, and if the boundary line intersects with the straight line segment and the sizes meet the requirements, the repair is judged to be qualified.
And step six, the method also comprises a step seven, wherein after the repairing and processing effects meet the requirements, the edges of the processing part are subjected to clamp rounding and sliding treatment, and the repairing work is completed after the fluorescent inspection is carried out. Wherein all edge pincers are rounded by R0.8 to avoid stress concentration.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. The method for repairing the wear-resistant layer in the R region of the turbine sawtooth crown transition is characterized by comprising the following steps of:
step one, preparing a local corrosion solution, and performing corrosion operation through the corrosion solution to confirm the boundary between the wear-resistant layer and the matrix;
step two, measuring the size of the dividing line, and classifying the severity of the intrusion of the wear-resistant layer into the transfer R area according to the measured size;
step three, a restoration contour scheme is formulated according to the classification result of the step two;
step four, intensity calculation is carried out on the formulated restoration profile scheme;
step five, machining the sawtooth crown switching R region according to a restoration contour scheme conforming to strength calculation;
and step six, checking the repairing effect of the sawtooth crown transfer R region processed in the step five.
2. The method for repairing a wear-resistant layer in a transition R region of a turbine sawtooth crown according to claim 1, wherein the local etching solution in the first step is HCl and FeCl 3 .6H 2 O, wherein the concentration of HCl is 91-126 g/L, feCl 3 .6H 2 The concentration of O is 242-300 g/L.
3. The method for repairing a wear-resistant layer in a transition R region of a turbine sawtooth crown according to claim 1, wherein the corrosion time of the local corrosion solution in the first step is 20-90S, and the corrosion temperature is 20-25 ℃.
4. The method for repairing a wear-resistant layer in a transition R region of a turbine serration crown according to claim 1, further comprising the following steps before the step one:
absolute ethyl alcohol or acetone is used for removing oil near the flow passage surface of the transfer R area;
and shielding and protecting the non-corrosion detection area.
5. The method for repairing the wear-resistant layer in the transition R area of the turbine sawtooth crown according to claim 1, wherein the distance from the intersection point of the boundary line and the transition R area to the non-working surface is X, and the maximum thickness dimension of the wear-resistant layer in the range of the transition R area is Y; the second step is specifically as follows:
when Y is more than or equal to 2 or X is less than or equal to 0, classifying the blades into a first type;
when Y is more than or equal to 1.2 and less than 2 or X is more than or equal to 0 and less than or equal to 0.5, classifying the blades into a second class;
when Y < 1.2 or X > 0.5, the blades are classified into a third class.
6. The method for repairing the wear-resistant layer in the turbine sawtooth crown transition R region according to claim 5, wherein when the blade is of a first type, the repairing profile scheme is specifically as follows: the included angle alpha between the working face side straight line segment of the repaired contour and the working face is 20-30 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
7. The method for repairing the wear-resistant layer in the turbine sawtooth crown transition R region according to claim 5, wherein when the blade is of the second type, the repairing profile scheme is specifically as follows: the included angle alpha between the working face side straight line segment of the repaired contour and the working face is 30-50 degrees; the radius of the first arc is R1 not less than 2, the radius of the second arc is R2 not less than 1.2, the radius of the third arc is R3 not less than 1.2, and the distance between the wear-resisting layer and the repaired transfer R area is d not less than 0.1.
8. The method for repairing the wear-resistant layer in the turbine sawtooth crown transition R region according to claim 5, wherein when the blade is of a third type, the repairing profile scheme is specifically as follows: the included angle alpha range between the working face side straight line segment of the repaired profile and the working face is alpha > 20 degrees, and the distance between the wear-resistant layer and the repaired switching R area is d 0.1.
9. The method for repairing the wear-resistant layer of the turbine sawtooth crown transition R region according to claim 1, wherein the fourth step is specifically: and adopting average equivalent stress of the cross section to evaluate the permanent strength reserve, and meeting the design requirement of the engine strength when the evaluation result is more than 1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310154999.4A CN116475681A (en) | 2023-02-22 | 2023-02-22 | Method for repairing wear-resistant layer of turbine sawtooth crown switching R region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310154999.4A CN116475681A (en) | 2023-02-22 | 2023-02-22 | Method for repairing wear-resistant layer of turbine sawtooth crown switching R region |
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| Publication Number | Publication Date |
|---|---|
| CN116475681A true CN116475681A (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310154999.4A Pending CN116475681A (en) | 2023-02-22 | 2023-02-22 | Method for repairing wear-resistant layer of turbine sawtooth crown switching R region |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116475681A (en) |
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2023
- 2023-02-22 CN CN202310154999.4A patent/CN116475681A/en active Pending
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