Processing method of corrosion-resistant blade adjustment ring

Abstract

The present invention discloses a method for processing a corrosion-resistant blade adjustment ring. Two half-ring blanks arranged in half are obtained by machining, and after the two half-ring blanks are paired to process multiple end holes, a suitable first positioning bushing is selected by calculation, so that the first positioning bushing with clearance fit can effectively avoid dimensional deviation when the first ring body is decomposed, ensuring that the subsequent second positioning bushing with interference fit can still meet the technical requirements. After the mounting hole is machined, sulfuric acid anodizing treatment can be performed to effectively ensure the integrity of the anodized protective film on the surface of the blade adjustment ring, improve the corrosion resistance of the blade adjustment ring, and prevent the occurrence of corrosion to the greatest extent, so that the turboshaft engine using the blade adjustment ring of this scheme has high reliability and long service life. At the same time, the machining process after sulfuric acid anodizing treatment is reduced, and the risk of damaging the anodized protective film during subsequent machining is reduced. The method has strong practicality and is suitable for wide promotion and application.

Description

Technical Field

[0001] The present invention relates to the technical field of blade adjustment ring processing, and in particular to a processing method of a corrosion-resistant blade adjustment ring. Background Art

[0002] The blade adjustment ring on a turboshaft engine is a crucial component of the compressor bearing casing. It is primarily used to adjust the angle of the compressor's guide vanes, thereby altering the turboshaft engine's airflow characteristics and, consequently, its performance. The blade adjustment ring features mounting holes on its side for a slider and a shouldered pin. It is secured to the outside of the axial flow casing via an adjustable slider. During turboshaft engine operation, the guide vanes are adjusted in angle via a rocker arm secured to the mounting hole. This means the blade adjustment ring also serves as a centering and support mechanism within the bearing casing. Corrosion in the mounting hole directly impacts the stability of the guide vanes, making its surface corrosion resistance particularly important. However, the blade adjustment ring is typically constructed of a half-and-half aluminum alloy profile, resulting in thin walls and high machining precision. The ring also requires paired machining, making it challenging to manufacture. Furthermore, since the blade adjustment ring is located outside the turboshaft engine during operation, it is significantly affected by the operating environment. Turboshaft engines are often used in corrosive marine environments, placing high demands on the blade adjustment ring's corrosion resistance.

[0003] However, in the current processing route of the blade adjustment ring, the overall surface treatment is often carried out by sulfuric acid anodizing before processing the precision holes on the side to improve the corrosion resistance. This is because the two half rings need to be combined into a whole when processing the mounting holes on the side, but an interference fit positioning bushing is used when combining the two half rings, so that the combined blade adjustment ring cannot be disassembled and assembled again, otherwise the bottom hole size will be out of tolerance, and sulfuric acid anodizing will corrode the positioning bushing. Therefore, after the mounting holes on the side of the blade adjustment ring are processed, only chemical oxidation treatment can be carried out. Compared with other parts that have been treated with sulfuric acid anodizing, the corrosion resistance of the mounting holes is quite different. When used in a highly corrosive environment such as at sea, the opening where the blade adjustment ring is connected to other parts is prone to corrosion, which seriously affects the reliability and service life of the turboshaft engine. Summary of the Invention

[0004] The present invention provides a method for processing a corrosion-resistant blade adjustment ring, so as to solve the technical problem that the blade adjustment ring on the existing turboshaft engine is prone to corrosion, resulting in low reliability and short service life of the turboshaft engine.

[0005] According to one aspect of the present invention, a method for processing a corrosion-resistant blade adjustment ring is provided, comprising the following steps: S1, machining to obtain two half-ring blanks arranged in half, and pairing the two half-ring blanks to process multiple end holes; S2, calculating the outer diameter size range of a first locating bushing that meets the requirements based on the positioning bushing aperture requirements, position requirements and actual position values ​​when the two half-ring blanks are combined, then selecting a suitable first locating bushing within the outer diameter size range of the first locating bushing, and then combining the two half-ring blanks into a first annular body through the first locating bushing and a connecting plate, wherein , the first positioning bushings are respectively clearance-fitted with the multiple end face holes on the two half-ring blanks; S3, after processing multiple mounting holes on the side of the first annular body, the first annular body is decomposed into two half-ring blanks; S4, the two half-ring blanks are anodized with sulfuric acid; S5, the two half-ring blanks and the end face lugs are combined into a second annular body through the second positioning bushings and the connecting plate, wherein the second positioning bushings are respectively interference-fitted with the multiple end face holes on the two half-ring blanks; S6, the sliders and the straight pins with shaft shoulders are respectively installed through the multiple mounting holes on the second annular body to obtain the blade adjustment ring.

[0006] As a further improvement of the above technical solution:

[0007] Furthermore, in step S2, the outer diameter range of the first positioning bushing is calculated as follows:

[0008]

[0009] bc≥0, c≥d;

[0010]

[0011] Among them, the positioning bushing aperture requirement is The outer diameter of the first positioning bushing The position requirement is E, the position deviation value is 2X, and the actual position value is W.

[0012] Furthermore, a=0.012, b=0, and E=0.1.

[0013] Furthermore, between step S5 and step S6, there is also a step of machining a lug hole on the end face lug.

[0014] Furthermore, in step S1 , when machining the end surface hole, the aperture machining tolerance of the end surface hole is reduced according to the thickness of the anodized protective film.

[0015] Furthermore, in step S3, when machining the mounting hole, the machining tolerance of the mounting hole diameter is reduced according to the thickness of the anodized protective film.

[0016] Furthermore, in step S4, the sulfuric acid anodizing treatment of the two half-ring blanks specifically includes the following steps: S41, cleaning the two half-ring blanks, and then installing the two half-ring blanks in an anodizing tank; S42, connecting the power supply to form an anodized protective film on the surface of the two half-ring blanks; S43, taking out the two half-ring blanks from the anodizing tank, cleaning the two half-ring blanks, and then drying the two half-ring blanks.

[0017] Furthermore, after step S43, the method further includes step S44, sealing the two half-ring blanks, and cleaning and drying the two half-ring blanks after the sealing process.

[0018] Furthermore, in step S6, the slider and the straight pin with shoulder are respectively installed through the multiple mounting holes on the second annular body. The specific steps are as follows: first, the second annular body, the slider and the straight pin with shoulder are respectively cleaned, and then the second annular body is clamped, and the multiple mounting holes on the second annular body are precisely positioned, and finally the slider and the straight pin with shoulder are respectively installed on the multiple mounting holes.

[0019] Furthermore, before the step of finally installing the slider and the straight pin with a shoulder on a plurality of mounting holes respectively, the step also includes: applying lubricant on the mounting contact surfaces of the slider and the straight pin with a shoulder.

[0020] The present invention has the following beneficial effects:

[0021] The processing method of the corrosion-resistant blade adjustment ring of the present invention obtains two half-ring blanks arranged in half by machining, and after pairing the two half-ring blanks to process multiple end holes, calculates the outer diameter size range of the first positioning bushing that meets the requirements according to the positioning bushing aperture requirements, position requirements and actual position values ​​when the two half-ring blanks are combined, and then selects a suitable first positioning bushing according to the outer diameter size range of the first positioning bushing, and then combines the two half-ring blanks into a first annular body through the first positioning bushing and the connecting plate, so that multiple mounting holes can be machined on the side of the first annular body, and then decomposes the first annular body into two half-ring blanks, and performs sulfuric acid anodizing treatment on the two half-ring blanks. At this time, since the two half-ring blanks already have mounting holes, an anodized protective film will be formed in the mounting holes, which has good corrosion resistance. The two half-ring blanks and the end face lugs are combined into a second annular body through the second positioning bushing and the connecting plate. Since when the first annular body is combined, the first positioning bushing is respectively clearance-matched with the multiple end holes on the two half-ring blanks. Therefore, after the first annular body is decomposed, the size of the end hole will not exceed the tolerance, ensuring that the interference fit of the second locating bushing with the multiple end hole holes on the two half-ring blanks can still meet the technical requirements, and the slider and the straight pin with shoulder are respectively installed through the multiple mounting holes on the second annular body to obtain the blade adjustment ring. Compared with the existing technology, this solution selects a suitable first locating bushing through calculation, so as to effectively avoid the size deviation when the first annular body is decomposed through the first locating bushing with clearance fit, ensuring that the subsequent interference fit of the second locating bushing can still meet the technical requirements, and after the mounting hole processing is completed, sulfuric acid anodizing treatment can be performed to effectively ensure the integrity of the anodized protective film on the surface of the blade adjustment ring, improve the corrosion resistance of the blade adjustment ring, and prevent the occurrence of corrosion to the greatest extent, so that the turboshaft engine with the blade adjustment ring of this solution has high reliability and long service life. At the same time, it also reduces the machining process after sulfuric acid anodizing treatment, reduces the risk of damaging the anodized protective film during subsequent machining, has strong practicality, and is suitable for wide promotion and application.

[0022] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a flowchart of the steps of a method for processing a corrosion-resistant blade adjustment ring according to a preferred embodiment of the present invention; DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0026] like Figure 1 As shown, the processing method of the corrosion-resistant blade adjustment ring of this embodiment includes the following steps: S1, machining to obtain two half-ring blanks arranged in half, and pairing the two half-ring blanks to process multiple end holes; S2, calculating the outer diameter size range of the first positioning bushing that meets the requirements according to the positioning bushing aperture requirements, position requirements and actual position values ​​when the two half-ring blanks are combined, and then selecting a suitable first positioning bushing according to the outer diameter size range of the first positioning bushing, and then combining the two half-ring blanks into a first annular body through the first positioning bushing and the connecting plate, wherein the first positioning bushing The positioning bushings are respectively clearance-fitted with the multiple end face holes on the two half-ring blanks; S3, after processing multiple mounting holes on the side of the first annular body, the first annular body is decomposed into two half-ring blanks; S4, the two half-ring blanks are anodized with sulfuric acid; S5, the two half-ring blanks and the end face lugs are combined into a second annular body through the second positioning bushing and the connecting plate, wherein the second positioning bushings are respectively interference-fitted with the multiple end face holes on the two half-ring blanks; S6, the slider and the straight pin with shoulder are respectively installed through the multiple mounting holes on the second annular body to obtain the blade adjustment ring.

[0027] Specifically, the processing method of the corrosion-resistant blade adjustment ring of the present invention obtains two half-ring blanks arranged in half by machining, and after pairing the two half-ring blanks to process multiple end holes, the outer diameter size range of the first positioning bushing that meets the requirements is calculated according to the positioning bushing aperture requirements, position requirements and actual position values ​​when the two half-ring blanks are combined, and then a suitable first positioning bushing is selected according to the outer diameter size range of the first positioning bushing, and then the two half-ring blanks are combined into a first annular body through the first positioning bushing and the connecting plate, so that multiple mounting holes can be machined on the side of the first annular body, and then the first annular body is decomposed into two half-ring blanks, and the two half-ring blanks are anodized with sulfuric acid. At this time, since the two half-ring blanks already have mounting holes, an anodized protective film will be formed in the mounting holes, which has good corrosion resistance. The two half-ring blanks and the end face lugs are combined into a second annular body through the second positioning bushing and the connecting plate. Since when the first annular body is combined, the first positioning bushing is clearance-matched with the multiple end holes on the two half-ring blanks respectively. Therefore, after the first annular body is decomposed, the size of the end hole will not exceed the tolerance, ensuring that the interference fit of the second locating bushing with the multiple end hole holes on the two half-ring blanks can still meet the technical requirements, and the slider and the straight pin with shaft shoulder are respectively installed through the multiple mounting holes on the second annular body to obtain the blade adjustment ring. Compared with the existing technology, this solution selects a suitable first locating bushing by calculation, so as to effectively avoid the size deviation when the first annular body is decomposed through the first locating bushing with clearance fit, ensuring that the subsequent interference fit of the second locating bushing can still meet the technical requirements, and after the mounting hole processing is completed, sulfuric acid anodizing treatment can be performed to effectively ensure the integrity of the anodized protective film on the surface of the blade adjustment ring, improve the corrosion resistance of the blade adjustment ring, and prevent the occurrence of corrosion to the greatest extent, so that the turboshaft engine with the blade adjustment ring of this solution has high reliability and long service life. At the same time, it also reduces the machining process after sulfuric acid anodizing treatment, reduces the risk of damaging the anodized protective film during subsequent machining, has strong practicality, and is suitable for wide promotion and application.

[0028] It should be understood that after the two half-ring blanks are paired and the processing of multiple end holes is completed, the actual position value of the two half-ring blanks when combined can be directly measured.

[0029] In this embodiment, in step S2, the outer diameter range of the first positioning bushing is calculated as follows:

[0030]

[0031] bc≥0, c≥d;

[0032]

[0033] Among them, the positioning bushing aperture requirement is The outer diameter of the first positioning bushing The position requirement is E, the position deviation value is 2X, and the actual position value is W.

[0034] It should be understood that X is the gap between the required locating bushing aperture and the outer diameter of the first locating bushing.

[0035] Specifically, the outer diameter size range of the first locating bushing is calculated through the above calculation process, and then the appropriate outer diameter size of the first locating bushing is selected from the range, so that the first locating bushing can be used to fit the end hole clearances on the two half-ring blanks respectively, to avoid the end hole size out of tolerance when the first ring body is decomposed, and to ensure that the interference fit of the second locating bushing meets the design requirements.

[0036] In this embodiment, a=0.012, b=0, E=0.1. Specifically, after the positioning bushing aperture requirements and position requirements are determined, the outer diameter size range of the first positioning bushing can be obtained as follows: During the processing, after the actual position value is measured, the outer diameter size range of the first positioning bushing can be calculated.

[0037] In this embodiment, between step S5 and step S6, there is further included the step of machining a lug hole on the end lug. Specifically, the end lug is connected to the guide blade through the lug hole and the pin to achieve rotation transmission.

[0038] In this embodiment, in step S1, during the end hole machining, the aperture machining tolerance of the end hole is reduced according to the thickness of the anodized protective film. Specifically, since an anodized protective film is formed within the end hole during the sulfuric acid anodizing treatment of the semi-ring blank, it is necessary to reduce the aperture machining tolerance of the end hole according to the thickness of the anodized protective film during the end hole machining to improve subsequent assembly accuracy.

[0039] It should be understood that although the end surface hole is processed first and then the anodized protective film is formed during the processing of a single blade adjustment ring, the blade adjustment ring is a part processed in batches, and the aperture processing tolerance of the upper end surface hole of the blade adjustment ring processed in the subsequent batch can be reduced accordingly based on the thickness of the anodized protective film inside the upper end surface hole of the blade adjustment ring processed in the previous batch.

[0040] In this embodiment, in step S3, during the machining of the mounting hole, the aperture machining tolerance of the mounting hole is reduced based on the thickness of the anodized protective film. Specifically, since an anodized protective film forms within the mounting hole during the sulfuric acid anodizing treatment of the semi-ring blank, it is necessary to reduce the aperture machining tolerance of the mounting hole based on the thickness of the anodized protective film during the machining of the mounting hole to improve subsequent assembly accuracy.

[0041] In this embodiment, in step S4, the sulfuric acid anodizing treatment of the two half-ring blanks specifically includes the following steps: S41, cleaning the two half-ring blanks, and then installing the two half-ring blanks in an anodizing tank; S42, connecting the power supply to form an anodized protective film on the surface of the two half-ring blanks; S43, taking out the two half-ring blanks from the anodizing tank, cleaning the two half-ring blanks, and then drying the two half-ring blanks. Specifically, after thoroughly cleaning the impurities on the surfaces of the two half-ring blanks to ensure that the surfaces of the two half-ring blanks are clean, the two half-ring blanks are installed in an anodizing tank to ensure that the two half-ring blanks are in good contact with the motor in the tank so that the current can pass evenly; a DC power supply is turned on, and under the action of electrolysis, the silver sulfate ions in the sulfuric acid electrolyte react with the aluminum atoms on the surface of the half-ring blanks to form a dense anodized protective film; after the anodized protective film is formed, the two half-ring blanks are taken out of the anodizing tank, and the two half-ring blanks are cleaned to remove the electrolyte and impurities remaining on the surface of the half-ring blanks, and then the two half-ring blanks are dried to prevent the anodized protective film from being damp or damaged.

[0042] In this embodiment, step S43 is followed by step S44, wherein the two semi-ring blanks are sealed, and the two semi-ring blanks are cleaned and dried after the sealing process. Specifically, the two semi-ring blanks are sealed to seal the micropores in the anodized protective film, thereby further improving the corrosion resistance of the semi-ring blanks. The two semi-ring blanks are cleaned and dried after the sealing process to remove the processing liquid or other impurities that may remain on the surface of the semi-ring blanks, thereby ensuring the processing quality and avoiding contamination in the subsequent processing process.

[0043] In this embodiment, in step S6, the slider and the direct pin with shoulder are respectively installed through the multiple mounting holes on the second annular body. The specific steps are as follows: first, the second annular body, the slider and the direct pin with shoulder are respectively cleaned, and then the second annular body is clamped, and the multiple mounting holes on the second annular body are precisely positioned, and finally the slider and the direct pin with shoulder are respectively installed on the multiple mounting holes.

[0044] Specifically, the second annular body, the slider and the straight pin with the shoulder are first cleaned separately to ensure the cleanliness and assembly quality in the subsequent assembly process, then the second annular body is clamped, and the multiple mounting holes on the second annular body are precisely positioned to ensure that the positions of the mounting holes are accurate, and finally the slider and the straight pin with the shoulder are installed on the multiple mounting holes respectively.

[0045] In this embodiment, before the slider and the shouldered pin are respectively installed in the plurality of mounting holes, the step further includes applying a lubricant to the mounting contact surfaces of the slider and the shouldered pin. Specifically, the lubricant reduces friction and wear during the assembly process, thereby improving assembly quality.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for processing a corrosion-resistant blade adjustment ring, characterized in that: The following steps are involved: S1, machining to obtain two half-ring blanks arranged in half, and pairing the two half-ring blanks to machine multiple end faces; S2, calculating the outer diameter size range of the first locating bushing that meets the requirements based on the locating bushing aperture requirements, position requirements, and measured position values ​​when the two half-ring blanks are combined, then selecting a suitable first locating bushing within the outer diameter size range of the first locating bushing, and then combining the two half-ring blanks into a first annular body using the first locating bushing and the connecting plate, wherein the first locating bushings respectively have clearance fit with the multiple end holes on the two half-ring blanks; S3, after machining a plurality of mounting holes on the side surface of the first annular body, decomposing the first annular body into two half-ring blanks; S4, performing sulfuric acid anodizing treatment on the two half-ring blanks; S5, combining the two half-ring blanks and the end face lugs into a second annular body through a second positioning bushing and a connecting plate, wherein the second positioning bushings are respectively interference-fitted with a plurality of end face holes on the two half-ring blanks; S6. Install the sliders and the straight pins with shaft shoulders through the multiple mounting holes on the second annular body to obtain a blade adjustment ring.

2. The method for processing a corrosion-resistant blade adjustment ring according to claim 1, characterized in that: In step S2, the outer diameter range of the first positioning bushing is calculated as follows: bc≥0, c≥d; Among them, the positioning bushing aperture requirement is The outer diameter of the first positioning bushing The position requirement is E, the position deviation value is 2X, and the measured position value is W.

3. The method for processing a corrosion-resistant blade adjustment ring according to claim 2, characterized in that: a=0.012, b=0, E=0.

1.

4. The method for processing a corrosion-resistant blade adjustment ring according to any one of claims 1 to 3, characterized in that: The following steps are included between step S5 and step S6: The lug holes are machined on the end lugs.

5. The method for processing a corrosion-resistant blade adjustment ring according to any one of claims 1 to 3, characterized in that: In step S1 , when machining the end surface, the aperture machining tolerance of the end surface is reduced according to the thickness of the anodized protective film.

6. The method for processing a corrosion-resistant blade adjustment ring according to any one of claims 1 to 3, characterized in that: In step S3 , when machining the mounting hole, the machining tolerance of the mounting hole diameter is reduced according to the thickness of the anodized protective film.

7. The method for processing a corrosion-resistant blade adjustment ring according to any one of claims 1 to 3, characterized in that: In step S4, the sulfuric acid anodizing treatment of the two half-ring blanks specifically includes the following steps: S41, cleaning the two half-ring blanks, and then installing the two half-ring blanks in an anodizing tank; S42, connecting the power supply to form an anodized protective film on the surfaces of the two half-ring blanks; S43, taking out the two half-ring blanks from the anodizing tank, cleaning the two half-ring blanks, and then drying the two half-ring blanks.

8. The method for processing a corrosion-resistant blade adjustment ring according to claim 7, characterized in that: After step S43, the method further includes the following steps: S44, performing sealing processing on the two half-ring blanks, and cleaning and drying the two half-ring blanks after the sealing processing.

9. The method for processing a corrosion-resistant blade adjustment ring according to any one of claims 1 to 3, characterized in that: In step S6, the slider and the shouldered straight pin are respectively installed through the multiple mounting holes on the second annular body. The specific steps are as follows: First, the second annular body, the slider and the straight pin with the shoulder are cleaned respectively, then the second annular body is clamped, and the multiple mounting holes on the second annular body are accurately positioned, and finally the slider and the straight pin with the shoulder are installed on the multiple mounting holes respectively.

10. The method for processing a corrosion-resistant blade adjustment ring according to claim 9, characterized in that: The steps include the following before the slider and the shoulder pin are mounted on the plurality of mounting holes: Apply lubricant to the mounting contact surfaces of the slide and the shoulder pin.

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