CN114192741A - Bending size correction method for turbine blade - Google Patents
Bending size correction method for turbine blade Download PDFInfo
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- CN114192741A CN114192741A CN202111538255.XA CN202111538255A CN114192741A CN 114192741 A CN114192741 A CN 114192741A CN 202111538255 A CN202111538255 A CN 202111538255A CN 114192741 A CN114192741 A CN 114192741A
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- turbine blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
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Abstract
The invention discloses a method for correcting the bending size of a turbine blade, which comprises the following steps: step 1, fixing wax sheets with the thickness of 0.4-1mm at two ends of a leaf-shaped correcting fetal membrane conforming to the leaf back of a turbine blade to be corrected to obtain a processed leaf-shaped correcting fetal membrane; step 2, placing a wax mold corresponding to the turbine blade to be corrected on the treated leaf-shaped correcting fetal membrane; and 3, placing a weight with the shape matched with that of the wax mold in the step 2 in the center of the wax mold in the step 2 along the width direction of the wax mold in the step 2, pressing to obtain the wax mold with the corrected bending and twisting size, and carrying out investment casting by using the obtained wax mold with the corrected bending and twisting size to obtain the turbine blade with the corrected bending and twisting size. Through the wax mold pre-deformation mode, the bending size reverse deformation amount can be quickly and effectively obtained, qualified castings are manufactured and applied to early-stage wax mold control, the trial production cost is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of investment precision casting, in particular to a method for correcting the bending size of a turbine blade.
Background
The gas turbine is a power source of modern manufacturing industry, wherein the precision casting turbine blade is one of the core components of the gas turbine, and the precision casting turbine blade without allowance of high-temperature alloy is generally produced by adopting an investment precision casting method. Because of the reasons of the structure of the precisely cast turbine blade, the arrangement of a pouring system and the like, the precisely cast turbine blade can generate larger thermal stress in the solidification and cooling processes, so that the profile of the precisely cast turbine blade is deformed, the bending torque is out of tolerance, and the rejection rate of the precisely cast turbine blade is high.
Because the finish-cast turbine blade generally does not allow for straightening during the casting stage, a wax pattern stage straightening or counter-deformation technique is used to reduce the bending tolerance of the finish-cast turbine blade. The reverse deformation technology is based on three-coordinate measurement, the molded surface of the precision casting turbine blade is subjected to parametric design, the deflection of the bending torsion is represented through the deviation of parameters, the average deformation of the precision casting turbine blade is determined through counting the sizes of a certain batch of precision casting turbine blades, a wax mold reverse deformation model of the precision casting turbine blade is designed according to the average deformation, then a corresponding wax mold correcting mold is designed and manufactured, process verification is carried out according to the model after reverse deformation, the reverse deformation model is corrected through the measurement result of the turbine blade, iteration is carried out repeatedly in this way, and finally the wax mold correcting mold corresponding to the turbine blade is determined.
The reversible deformation technology has two defects when the size of the precision casting turbine blade is out of tolerance: firstly, the average deformation of the precision-cast turbine blades needs to be determined by counting the sizes of a certain batch of precision-cast turbine blades, so that the early-stage investment cost is high; second, the statistical deformation-validation-trimming process takes a lot of time and takes a long period.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for correcting the bending size of a turbine blade, the bending size reversible deformation amount can be quickly and effectively obtained in a wax mold pre-deformation mode, a qualified casting is manufactured and applied to early-stage wax mold control, the trial-manufacturing cost is reduced, and the production efficiency is improved.
The invention is realized by the following technical scheme:
a method for correcting the bending size of a turbine blade comprises the following steps:
step 1, fixing wax sheets with the thickness of 0.4-1mm at two ends of a leaf-shaped correcting fetal membrane conforming to the leaf back of a turbine blade to be corrected to obtain a processed leaf-shaped correcting fetal membrane;
step 2, placing a wax mold corresponding to the turbine blade to be corrected on the treated leaf-shaped correcting fetal membrane;
and 3, placing a weight with the shape matched with that of the wax mold in the step 2 in the center of the wax mold in the step 2 along the width direction of the wax mold in the step 2, pressing to obtain the wax mold with the corrected bending and twisting size, and carrying out investment casting by using the obtained wax mold with the corrected bending and twisting size to obtain the turbine blade with the corrected bending and twisting size.
Preferably, the turbine blade to be straightened in the step 1 is a precision cast turbine blade.
Preferably, the wax sheet in step 1 is adhered to two ends of the leaf-type correcting fetal membrane.
Preferably, step 2 is to place the wax mould blade back corresponding to the turbine blade to be corrected on the position corresponding to the blade-type correcting fetal membrane in step 1.
Preferably, the weight in step 3 is a sand bag.
Further, the width of the sand bag contacted with the wax mould in the step 2 is 50-100 mm.
Preferably, the weight of the weight in the step 3 is 500-1000 g.
Preferably, step 3 is performed by pressing 500-1000g of weight in the center of the wax mold for 3-5 min.
Preferably, in step 3, the wax mold after the bending size correction is reshaped and then investment casting is performed.
Preferably, the bending of the turbine blade after the bending size correction in the step 3 is controlled to be +/-0.2 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the method is characterized in that wax sheets with certain thickness are fixed at two ends of a leaf-shaped correcting fetal membrane which accords with the leaf back of a turbine blade to be corrected, and then a wax mould corresponding to the turbine blade to be corrected is placed on the leaf-shaped correcting fetal membrane, so that a weight with a shape matched with the wax mould is placed in the center of the wax mould along the width direction of the wax mould for pressing, and the wax mould has certain pre-transformation to control the subsequent bending size of the turbine blade, so that the wax mould with the corrected bending size is obtained. Through the wax mold pre-deformation mode, the bending size reverse deformation amount can be quickly and effectively obtained, qualified castings are manufactured and applied to early-stage wax mold control, the trial production cost is reduced, and the production efficiency is improved. By adopting the method, the accurate casting turbine blade can obtain the appropriate wax mold pre-deformation after the initial trial production, the bending size of the cast turbine blade is qualified and stable, the problem of bending control of long and thin large turbine blades is solved, and the development period is effectively shortened.
Drawings
FIG. 1 is a schematic view of a precision cast turbine blade according to the present invention.
Fig. 2 is a cross-sectional view in a width direction of fig. 1.
FIG. 3 is a three-dimensional blue scan of an uncorrected leaf.
FIG. 4 is a three-dimensional blue light scan of a blade according to an embodiment of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a method for correcting the bending size of a precision casting turbine blade, which comprises the following steps:
step 1: manufacturing a blade profile correcting fetal membrane conforming to the blade back of the precision casting turbine blade;
step 2: sticking wax sheets with the thickness of 0.1mm-0.2mm at two ends of the leaf-shaped correcting fetal membrane;
and step 3: pressing a wax mould of the precisely cast turbine blade, immediately taking out the wax mould and placing the back of the blade on the corresponding position of the blade-shaped correcting fetal membrane stuck with the wax sheet;
and 4, step 4: placing a sand bag with the weight of 500g-1000g in the right middle of the wax mould of the precision casting turbine blade, wherein the sand bag can be deformed so as to adapt to different shapes of the blade, forming a strip shape with the thickness of 50 mm-100 mm along the width direction of the wax mould of the precision casting turbine blade, and keeping for 3 min-5 min, so that the wax mould of the precision casting turbine blade forms certain deformation under the action of the gravity of the sand bag.
And 5: and (3) taking off the corrected wax mould of the precision casting turbine blade, and marking the correction amount at the tenon of the wax mould of the precision casting turbine blade, or marking at other positions so as to remember the thickness value of the wax sheet in the step (2).
The precision casting turbine blade of a certain machine as shown in fig. 1 and fig. 2 has the total length of about 310mm, the length of the blade body part of about 270mm, the maximum thickness of the blade profile of 15mm, the thickness of the exhaust edge of 1mm, the average chord width of 52mm, the blade has smaller blade profile thickness difference at the blade shroud and larger blade profile thickness difference at the tenon.
Step 6: after the number of the wax moulds of the precisely cast turbine blade required for the wax sheet test with the thickness of 0.2mm is pressed, a plurality of wax moulds of the precisely cast turbine blade can be pressed according to the actual requirement and the same method, and generally 4 pieces are common;
and 7: and (3) replacing the thickness of the wax sheet stuck in the step (2), adjusting the thickness of the wax sheet from 0.2mm to 0.2 multiplied by 2mm, repeating the step (3-5), pressing 4 pieces of precision casting turbine blade wax molds stuck with the wax sheet with the thickness of 0.4mm for the test, and marking the correction amount at the tenon of each precision casting turbine blade wax mold.
And pressing 4 pieces of fine casting turbine blade wax molds stuck with wax sheets with the thickness of 0.2 multiplied by 3mm, 0.2 multiplied by 4mm and 1.0mm according to the same method.
And 8: and (3) the corrected wax mold of the precision casting turbine blade is placed in a tray filled with sponge horizontally with the air inlet edge facing upwards and the air outlet edge facing downwards, and the wax mold cannot be stacked.
And step 9: and taking out the wax mold of the precisely cast turbine blade from the tray filled with the sponge for modification, and putting back the wax mold into the tray filled with the sponge again after modification, wherein the wax mold is kept in a flat state and can not be stacked.
The modification operation inevitably needs to hold the blade, and the deformation in the process is inevitable, so that an operator is required to carefully operate the blade with a nylon glove during the modification operation.
Step 10: carrying out normal precision investment casting and modification, combination, shell making, pouring, cleaning, three-dimensional detection and three-dimensional blue light scanning detection, finding out a casting with a qualified detection result and correcting amount marks, and carrying out pasting correction on the subsequent casting according to the thickness of a pasting wax sheet corresponding to the qualified casting;
step 11: when the production demand is large, the corresponding durable correction molds made of aluminum and the like can be designed and manufactured according to the thickness of the wax sheet adhered to the mold, namely the correction data, and the reverse correction wax molds can be obtained, so that the purpose of controlling the bending and twisting size of the casting is achieved.
The first embodiment is as follows:
the maximum height of a certain type of gas turbine blade is 290mm, the chord width is 49-53mm, the maximum thickness of the blade profile is 5.5-13mm, each section of the blade body is not more than plus or minus 15' of torsion relative to the theoretical profile of the blade body, and the bending is within plus or minus 0.25 mm.
When the bending size of the precision casting turbine blade is corrected, the implementation steps are as follows:
step 1: manufacturing a blade profile correcting fetal membrane conforming to the blade back of the precision casting turbine blade;
step 2: sticking 0.2mm wax sheets at two ends of the leaf-shaped correcting fetal membrane;
and step 3: pressing a wax mould corresponding to the precisely cast turbine blade, and immediately taking out the wax mould and placing the blade back of the wax mould on the corresponding position of the blade-shaped correcting fetal membrane stuck with the wax sheet;
and 4, step 4: a500 g sand bag was placed right in the middle of the wax mold of the precision cast turbine blade and held for 5 minutes.
And 5: and taking off the corrected wax mold of the precisely cast turbine blade and marking the correction amount at the tenon of the wax mold of the precisely cast turbine blade.
Step 6: pressing 3 pieces of wax moulds of the precisely cast turbine blade after pressing the number of wax moulds of the wax sheet test with the required thickness of 0.2 mm;
and 7: and (3) replacing the thickness of the wax sheet stuck in the step (2), adjusting the thickness of the wax sheet from 0.2mm to 0.4mm, repeating the step (3-5), pressing 4 pieces of precision casting turbine blade wax molds stuck with the wax sheet with the thickness of 0.4mm for the test, and marking the correction amount at the tenon. And pressing 4 pieces of precision casting turbine blade wax molds which are stuck with wax sheets with the thickness of 0.6mm and 0.8mm according to the same method.
And 8: the corrected precision casting turbine blade is placed in a tray filled with sponge horizontally with the air inlet edge facing upwards and the air outlet edge facing downwards, and the turbine blade cannot be stacked.
And step 9: and taking out the wax mould from the tray filled with the sponge for carrying out shape modification operation, and putting back the wax mould into the tray filled with the sponge again after modification, wherein the wax mould is kept in a flat state and can not be stacked.
The modification operation inevitably needs to hold the blade, and the deformation in the process is inevitable, so that an operator is required to carefully operate the blade with a nylon glove during the modification operation.
And 10, performing normal precision investment casting and modification, combination, shell making, pouring, cleaning, three-coordinate and three-dimensional blue light scanning detection, and detecting that the bending and torsion of the casting can meet the design requirements after the casting is placed with a wax sheet of 0.8 mm.
A three-dimensional blue light scanning image of an uncorrected blade is shown in figure 3, a casting is bent and deformed by 1.0mm, and the torsional deformation is 0.51mm, while the bending and torsion of the blade of the embodiment are controlled within the range of +/-0.2 mm after being corrected as shown in figure 4.
Step 11: according to the thickness of the wax sheet adhered to the aluminum alloy correcting die, an aluminum correcting die with two ends of 0.8mm and a middle of 0mm is designed and manufactured, and a casting is produced to achieve the purpose of correcting the bending torsion of the casting.
Example two:
the maximum height of the fine cast turbine blade for the operation of a certain type of gas turbine is 320mm, the chord width is 48-53mm, the maximum thickness of the blade profile is 5-12mm, the torsion of each section of the blade body relative to the theoretical profile of the blade body is not more than +/-15', and the bending is within +/-0.25 mm.
When the bending size of the precision casting turbine blade is corrected, the implementation steps are as follows:
step 1: manufacturing a blade profile correcting fetal membrane conforming to the blade back of the precision casting turbine blade;
step 2: sticking 0.2mm wax sheets at two ends of the leaf-shaped correcting fetal membrane;
and step 3: pressing a wax mould corresponding to the precisely cast turbine blade, and immediately taking out the wax mould and placing the blade back of the wax mould on the corresponding position of the blade-shaped correcting fetal membrane stuck with the wax sheet;
and 4, step 4: a500 g sand bag was placed right in the middle of the wax mold of the precision cast turbine blade and held for 5 minutes.
And 5: and taking off the corrected wax mold of the precisely cast turbine blade and marking the correction amount at the tenon of the wax mold of the precisely cast turbine blade.
Step 6: pressing 3 pieces of wax moulds of the precisely cast turbine blade after pressing the number of wax moulds of the wax sheet test with the required thickness of 0.2 mm;
and 7: and (3) replacing the thickness of the wax sheet stuck in the step (2), adjusting the thickness of the wax sheet from 0.2mm to 0.4mm, repeating the step (3-5), pressing 4 pieces of precision casting turbine blade wax molds stuck with the wax sheet with the thickness of 0.4mm for the test, and marking the correction amount at the tenon. And pressing 4 pieces of precision casting turbine blade wax molds which are stuck with wax sheets with the thickness of 0.6mm, 0.8mm and 1.0mm on the straightening tire mold according to the same method.
And 8: the corrected precision casting turbine blade is placed in a tray filled with sponge horizontally with the air inlet edge facing upwards and the air outlet edge facing downwards, and the turbine blade cannot be stacked.
And step 9: and taking out the wax mould from the tray filled with the sponge for carrying out shape modification operation, and putting back the wax mould into the tray filled with the sponge again after modification, wherein the wax mould is kept in a flat state and can not be stacked.
The modification operation inevitably needs to hold the blade, and the deformation in the process is inevitable, so that an operator is required to carefully operate the blade with a nylon glove during the modification operation.
And 10, performing normal precision investment casting and modification, combination, shell making, pouring, cleaning, three-coordinate and three-dimensional blue light scanning detection, and detecting that the bending and torsion of the casting can meet the design requirements after the casting is placed with a 1.0mm wax sheet.
Step 11: according to the thickness of the wax sheet adhered to the aluminum alloy correcting die, an aluminum correcting die with two ends of 1.0mm and a middle of 0mm is designed and manufactured, and a casting is produced to achieve the purpose of correcting the bending torsion of the casting.
Example three:
the precision-cast turbine blade for certain types of gas turbines has a length of about 245mm, a chord width of 75-85mm and a maximum thickness of about 13 mm. The twisting of each section of the blade body relative to the theoretical profile of the blade body is not more than +/-15', and the bending is within +/-0.30 mm.
When the bending size of the precision casting turbine blade is corrected, the implementation steps are as follows:
step 1: manufacturing a blade profile correcting fetal membrane conforming to the blade back of the precision casting turbine blade;
step 2: sticking 0.2mm wax sheets at two ends of the leaf-shaped correcting fetal membrane;
and step 3: pressing a wax mould corresponding to the precisely cast turbine blade, and immediately taking out the wax mould and placing the blade back of the wax mould on the corresponding position of the blade-shaped correcting fetal membrane stuck with the wax sheet;
and 4, step 4: a500 g sand bag was placed right in the middle of the wax mold of the precision cast turbine blade and held for 5 minutes.
And 5: and taking off the corrected wax mold of the precisely cast turbine blade and marking the correction amount at the tenon of the wax mold of the precisely cast turbine blade.
Step 6: pressing 3 pieces of wax moulds of the precisely cast turbine blade after pressing the number of wax moulds of the wax sheet test with the required thickness of 0.2 mm;
and 7: and (3) replacing the thickness of the wax sheet stuck in the step (2), adjusting the thickness of the wax sheet from 0.2mm to 0.4mm, repeating the step (3-5), pressing 4 pieces of precision casting turbine blade wax molds stuck with the wax sheet with the thickness of 0.4mm for the test, and marking the correction amount at the tenon. And pressing 4 pieces of precision casting turbine blade wax molds which are stuck with wax sheets with the thickness of 0.6mm on the straightening forming die according to the same method.
And 8: the corrected precision casting turbine blade is placed in a tray filled with sponge horizontally with the air inlet edge facing upwards and the air outlet edge facing downwards, and the turbine blade cannot be stacked.
And step 9: and taking out the wax mould from the tray filled with the sponge for carrying out shape modification operation, and putting back the wax mould into the tray filled with the sponge again after modification, wherein the wax mould is kept in a flat state and can not be stacked.
The modification operation inevitably needs to hold the blade, and the deformation in the process is inevitable, so that an operator is required to carefully operate the blade with a nylon glove during the modification operation.
And 10, performing normal precision investment casting and modification, combination, shell making, pouring, cleaning, three-coordinate and three-dimensional blue light scanning detection, and detecting that the bending and torsion of the casting can meet the design requirements after the casting is placed with a 0.4mm wax sheet.
Step 11: according to the thickness of the wax sheet adhered to the aluminum alloy correcting die, an aluminum correcting die with two ends of 1.0mm and a middle of 0mm is designed and manufactured, and a casting is produced to achieve the purpose of correcting the bending torsion of the casting.
Claims (10)
1. A method for correcting the bending size of a turbine blade is characterized by comprising the following steps:
step 1, fixing wax sheets with the thickness of 0.4-1mm at two ends of a leaf-shaped correcting fetal membrane conforming to the leaf back of a turbine blade to be corrected to obtain a processed leaf-shaped correcting fetal membrane;
step 2, placing a wax mold corresponding to the turbine blade to be corrected on the treated leaf-shaped correcting fetal membrane;
and 3, placing a weight with the shape matched with that of the wax mold in the step 2 in the center of the wax mold in the step 2 along the width direction of the wax mold in the step 2, pressing to obtain the wax mold with the corrected bending and twisting size, and carrying out investment casting by using the obtained wax mold with the corrected bending and twisting size to obtain the turbine blade with the corrected bending and twisting size.
2. The method for correcting the camber distortion dimension of a turbine blade according to claim 1, wherein the turbine blade to be corrected in step 1 is a precision cast turbine blade.
3. The method for correcting the camber distortion dimension of a turbine blade according to claim 1, wherein the wax sheet of step 1 is attached to both ends of the leaf straightening fetal membrane.
4. The method for correcting the dimensional distortion of a turbine blade according to claim 1, wherein step 2 is to place the back of the wax pattern corresponding to the turbine blade to be corrected on the position corresponding to the leaf-straightening fetal membrane in step 1.
5. The method for correcting the camber distortion dimension of a turbine blade according to claim 1, wherein the weight in step 3 is a sand bag.
6. The method for correcting the dimensional distortion of a turbine blade according to claim 5, wherein the width of the sand pack in contact with the wax pattern of step 2 is 50 to 100 mm.
7. The turbine blade distortion sizing method as claimed in claim 1, wherein the weight of said weight in step 3 is 500-1000 g.
8. The turbine blade distortion dimension correcting method as claimed in claim 1, wherein step 3 is carried out by pressing a weight of 500-1000g in the center of the wax pattern for 3-5 min.
9. The method for rectifying the twist size of a turbine blade according to claim 1, wherein the step 3 is performed by modifying the wax pattern after the twist size rectification and then performing investment casting.
10. The turbine blade camber distortion sizing method according to claim 1, wherein the turbine blade camber distortion after the camber distortion sizing of step 3 is controlled to ± 0.2 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111538255.XA CN114192741A (en) | 2021-12-15 | 2021-12-15 | Bending size correction method for turbine blade |
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| CN202111538255.XA CN114192741A (en) | 2021-12-15 | 2021-12-15 | Bending size correction method for turbine blade |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115041630A (en) * | 2022-06-29 | 2022-09-13 | 中国航发动力股份有限公司 | Method for correcting wax mold of turbine blade with adjustable sectioning surface |
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| CN115041630A (en) * | 2022-06-29 | 2022-09-13 | 中国航发动力股份有限公司 | Method for correcting wax mold of turbine blade with adjustable sectioning surface |
| CN115041630B (en) * | 2022-06-29 | 2023-10-20 | 中国航发动力股份有限公司 | Wax mould correction method for turbine blade with adjustable sub-section |
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