Method of polishing an outer duct exit guide vane

Abstract

The application belongs to the technical field of polishing of aero-engine parts, and discloses a polishing method for an outer bypass outlet guide vane, which comprises the following steps: dividing the guide vane into a back side profile, a basin side profile, a honeycomb groove, a flow channel surface, a switching R, a leading edge side, a trailing edge side, a transition R, a first inner groove R and a second inner groove R; cooling the outer surface of the guide vane to prevent the guide vane from being deformed due to polishing heat; and then polishing the above-mentioned polishing areas respectively. The polishing method for the outer bypass outlet guide vane can realize efficient polishing of the guide vane, save polishing time and labor, greatly improve the polishing efficiency and surface integrity of the guide vane, and has small deformation, good surface quality and stable and reliable guide vane quality.

Description

Technical Field

[0001] This invention relates to the field of polishing technology for aero-engine components, and in particular to a polishing method for the guide vane at the outlet of an outer bypass duct. Background Technology

[0002] Aero engines have strict weight requirements, and the materials of their internal components must possess high strength. Aluminum alloy blades, due to their low density, high strength, and corrosion resistance, are widely used in aero engines where internal temperatures are below 300°C. Most of the power in high-bypass turbofan aero engines comes from the air accelerated by the fan in the external intake duct. This air, after being accelerated by the fan, exits the engine through the guide vanes of the external bypass duct, generating powerful thrust. The guide vanes play a guiding role during engine operation. The surface quality of the guide vanes directly affects their aerodynamic performance, operational performance, and fatigue strength, thus impacting the performance of the aero engine. Polishing is the main method for improving the surface quality of guide vanes; however, current polishing methods suffer from low efficiency and poor surface quality. Furthermore, due to the high thermal conductivity of aluminum alloys and rapid heat transfer, the thin walls and hollow structures of the external bypass duct guide vanes can cause deformation. Summary of the Invention

[0003] The purpose of this invention is to provide a polishing method for the guide vane at the outlet of an outer bypass duct, which improves the polishing efficiency and surface integrity of the guide vane and minimizes the deformation caused by polishing.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] 1. Polishing methods for the guide vanes at the outlet of the bypass duct, including:

[0006] S1. Divide the guide vane into multiple polishing areas, the polishing areas including the back side profile, the basin side profile, the honeycomb groove, the flow channel surface, the transition R, the leading edge side, the trailing edge side, the transition R, the first inner groove R, and the second inner groove R; and select a corresponding polishing tool for each polishing area;

[0007] S2. Cool the outer surface of the guide vane to prevent the polishing heat from deforming the guide vane;

[0008] S3. Polish the back side surface to eliminate tool marks;

[0009] S4. Polish the side surface of the basin to remove tool marks;

[0010] S5. Polish the honeycomb grooves to remove tool marks inside the honeycomb grooves;

[0011] S6. Polish the flow channel surface, and then polish the adapter R to eliminate tool marks;

[0012] S7. Polish the leading edge side and the trailing edge side to eliminate tool marks;

[0013] S8. Polish the first inner groove R to eliminate tool marks;

[0014] S9. Polish the second inner groove R to eliminate tool marks;

[0015] S10. Polish the transition R to eliminate tool marks;

[0016] S11. Polish the back side profile and the basin side profile to improve the smoothness;

[0017] S12. Polish the leading edge side, the trailing edge side, the first inner groove R, the second inner groove R, and the transition R to improve the surface finish.

[0018] Preferably, compressed air is used for air cooling, and a dust collection device is used to collect the dust on the guide vanes while cooling.

[0019] Preferably, when polishing the back side profile, polishing is performed along the chord length direction of the guide vane every time the guide vane travels a preset distance along its length, and the directions of two adjacent polishing operations are opposite.

[0020] When polishing the side surface of the basin, polishing is performed along the chord length of the guide vane every time the guide vane travels a preset distance along its length, and the directions of two adjacent polishing operations are opposite.

[0021] Preferably, the basin-side profile and the back-side profile are divided into several small areas. Each small area is polished along the chord length of the guide vane as it travels the preset distance along the length of the guide vane, and the directions of two adjacent polishing operations are opposite.

[0022] Preferably, when polishing each of the small areas continuously, the time interval between two adjacent polishing operations is greater than or equal to 10 seconds.

[0023] Preferably, in steps S3 and S4, a rubber wheel with a thickness of 50 mm and a diameter of 200 mm and a sanding belt with a mesh size of 400-800 are selected to polish the back side profile and the basin side profile. The amount of material removed during polishing in steps S3 and S4 is 0.03-0.05 mm, the feed speed is 500-800 mm / min, and the preset distance is 6-10 mm.

[0024] Preferably, in step S5, a rubber wheel with a thickness of 50 mm and a diameter of 80 mm and a 600-mesh abrasive belt are selected to polish the honeycomb groove; the polishing amount is 0.03 to 0.05 mm, the feed speed is 500 to 800 mm / min, and the row spacing is 6 to 10 mm.

[0025] In step S6, a flap wheel is selected to polish the flow channel surface, and the polishing amount is 0.03-0.05mm; in step S6, a 6S fiber wheel with a thickness of 50mm and a diameter of 200mm is selected to polish the adapter R.

[0026] In step S7, firstly, an oil-polishing file is selected to polish the leading edge side and the trailing edge side, and then 240-320 grit flocked sandpaper is selected to polish the leading edge side and the trailing edge side again.

[0027] In step S8, a sand mill is selected in conjunction with a flap wheel and 240-320 mesh flocked sandpaper to polish the first inner groove R;

[0028] In step S9, an eccentric sand mill head is selected and used with 320-800 grit flocked sandpaper to polish the second inner groove R;

[0029] In step S10, a sesame seed grinding head with a diameter of 4mm is selected to polish the transition R.

[0030] Preferably, in step S11, a rubber wheel with a thickness of 50 mm and a diameter of 200 mm and a sanding belt with a mesh size of 400 to 800 are selected to polish the back side profile and the basin side profile. The polishing feed speed is 500 to 800 mm / min and the row spacing is 3 to 5 mm.

[0031] In step S12, the polishing tool is selected as 600-800 grit flocked sandpaper to repeatedly polish the leading edge side, the trailing edge side, the first inner groove R, the second inner groove R, and the transition R.

[0032] Preferably, step S41 is included between step S4 and step S5, in which a polishing tool is selected to polish the missing areas of the back side profile and the missing areas of the basin side profile in steps S3 and S4 using a rubber wheel with a thickness of 35 mm and a diameter of 200 mm and a sanding belt with a grit of 400 to 800 grit.

[0033] Preferably, step S61 is included between steps S6 and S7, in which a 6S fiber wheel with a thickness of 50 mm and a diameter of 200 mm is selected as the polishing tool to refine the flow channel surface and the adapter R.

[0034] The beneficial effects of this invention are:

[0035] The above-mentioned polishing method for the guide vane of the outer bypass duct outlet can achieve efficient polishing of the guide vane, save polishing time and manpower, greatly improve the polishing efficiency and surface integrity of the guide vane, reduce the deformation caused by polishing, improve the surface quality, and ensure stable and reliable guide vane quality. Attached Figure Description

[0036] Figure 1This is a schematic diagram showing one perspective of the polished area in this invention;

[0037] Figure 2 This is a schematic diagram showing the polished area from another perspective in this invention;

[0038] Figure 3 This is a flowchart of the polishing method for the guide vane at the outlet of the bypass duct according to the present invention.

[0039] In the picture:

[0040] 1. Back side profile; 2. Basin side profile; 3. Honeycomb groove; 4. Flow channel surface; 5. Transition R; 6. Leading edge side; 7. Tail edge side; 8. Cover plate groove; 9. Transition R; 10. First inner groove R; 11. Second inner groove R. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0045] like Figure 1-3 As shown, this embodiment proposes a polishing method for the guide vane at the outlet of the bypass duct, to achieve polishing of the guide vane at the outlet of the bypass duct (hereinafter referred to as the guide vane), including the following steps:

[0046] S1. Divide the guide vane into multiple polishing areas, including the back side profile 1, the basin side profile 2, the honeycomb groove 3, the flow channel surface 4, the transition R5, the leading edge side 6, the trailing edge side 7, the transition R9, the first inner groove R10, and the second inner groove R11; the specific distribution of the polishing areas is as follows: Figure 1 and Figure 2 As shown, select the appropriate polishing tool for each polishing area and check whether the polishing tool is qualified to avoid polishing damage caused by using unqualified tools.

[0047] S2. Compressed air is used to cool the surface of the guide vane through air cooling, which avoids the heat generated during polishing being transferred too quickly and causing the guide vane to deform. At the same time as cooling, a dust collection device can be used to collect and remove dust from the guide vane, so as to avoid the dust affecting the polishing process. There are no specific restrictions on the selection of the dust collection device.

[0048] S3. When polishing the back side profile 1 to remove tool marks, select a rubber wheel with a thickness of 50mm and a diameter of 200mm and an abrasive belt of 400-800 grit. For example, the abrasive belt can be, but is not limited to, a silicon carbide soft cloth stacked on top of the abrasive belt. The polishing route can be such that each time the guide vane travels a preset distance along its length (6-10mm), polishing is performed along the chord length of the guide vane, with adjacent polishing directions opposite. The polishing allowance is 0.03-0.05mm, and the feed rate is 500-800mm / min. It should be noted here that, if... Figure 2 As shown, the length direction of the guide vane is the X direction in the figure, and the chord length direction of the guide vane is the opposite of the Y direction in the figure. The polishing method described above facilitates heat dissipation and avoids ablation and elastic deformation.

[0049] To further reduce the adverse effects of polishing heat on guide vane deformation, the back surface 1 is divided into several small regions, the shape of which is not specifically limited; for example, they can be formed into squares or rectangles according to the length and chordal direction of the guide vane. During polishing, each small region is polished individually. Within each small region, the polishing path proceeds along the chordal direction of the guide vane after traveling a preset distance along its length, with adjacent polishing operations occurring in opposite directions. It is understood that polishing is not a one-time process and requires multiple polishing operations. When polishing each small region continuously, the time interval between adjacent polishing operations is greater than or equal to 10 seconds, which facilitates heat dissipation in the polished area, reduces heat-induced deformation of the guide vane, and also reduces polishing damage to the back surface 1, improving surface integrity.

[0050] S4. When polishing the side surface 2 of the basin to remove tool marks, select a rubber wheel with a thickness of 50mm and a diameter of 200mm and an abrasive belt of 400-800 grit. For example, the abrasive belt can be, but is not limited to, a silicon carbide soft cloth stacked on top of the abrasive belt. The polishing method can be the same as polishing the back surface 1, dividing the side surface 2 of the basin into several small areas for polishing. The specific polishing route operation can be the same as in step S3, and will not be repeated here.

[0051] S41. For the back side profile 1 and basin side profile 2 completed in steps S3 and S4, use a rubber wheel with a thickness of 35mm and a diameter of 200mm in conjunction with a 400-800 grit abrasive belt to polish the missed areas of the back side profile and basin side profile in steps S3 and S4. It should be noted that the missed areas of the back side profile and basin side profile refer to the areas not polished in steps S3 and S4. Since the guide vane has areas with large curvature changes in the back side profile 1 and basin side profile 2, the 50mm thick and 200mm diameter rubber wheel cannot polish the entire area due to its own characteristics. Therefore, a 35mm thick and 200mm diameter rubber wheel in conjunction with a 400-800 grit abrasive belt is used for supplementary polishing to eliminate the tool marks in the missed areas of the back side profile and basin side profile. For example, the abrasive belt can be, but is not limited to, a silicon carbide soft cloth stacked abrasive belt.

[0052] S5. Select a rubber wheel with a thickness of 50mm and a diameter of 80mm and a 600-grit abrasive belt to polish the honeycomb groove 3 to eliminate the tool marks in the honeycomb groove 3. The polishing amount is 0.03 to 0.05mm, the feed speed is 500 to 800mm / min, and the row spacing is 6 to 10mm.

[0053] S6. Use a flap wheel to polish the flow channel surface 4 to eliminate the tool marks on the flow channel surface 4. The polishing amount is 0.03~0.05mm. Use a 6S fiber wheel with a thickness of 50mm and a diameter of 200mm to polish the adapter R5 to eliminate the tool marks at the adapter R5. Figure 1and 2 The transition R shown exists in multiple locations on the guide vane.

[0054] S61. Select a 6S fiber wheel with a thickness of 50mm and a diameter of 200mm as the polishing tool to refine the flow channel surface 4 and the adapter R5, so as to improve the smoothness of the flow channel surface 4 and the adapter R5.

[0055] S7. First, use a polishing file to polish the leading edge side 6 and the trailing edge side 7. The polishing file mainly removes the peaks of the tool marks. Then, use 240-320 grit flocked sandpaper to polish the leading edge side 6 and the trailing edge side 7 again to remove the tool marks on the leading edge side 6 and the trailing edge side 7. It should be noted that there is no restriction on the polishing order of the leading edge side 6 and the trailing edge side 7.

[0056] S8. Use a sand mill and a flap wheel to coarsely polish the first inner groove R10. In this embodiment, the first inner groove R10 refers to the inner groove R of the honeycomb groove 3. Then, use 240-320 grit flocked sandpaper to finely polish the first inner groove R10 to eliminate the tool marks on the first inner groove R10.

[0057] S9. Select an eccentric sander head and use 320-800 grit flocked sandpaper to polish the second inner groove R11 to eliminate the tool marks on the second inner groove R11; in this embodiment, the second inner groove R11 refers to the inner groove R of the cover plate groove 8.

[0058] S10. Use a sesame seed grinding head with a diameter of 4mm to polish transition R9 to eliminate the tool marks of transition R9.

[0059] S11. Select a rubber wheel with a thickness of 50mm and a diameter of 200mm and a sanding belt with a mesh size of 400-800 to polish the back side profile 1 and the basin side profile 2 to improve their smoothness. The polishing feed speed is 500-800mm / min and the row spacing is 3-5mm. The polishing method is still to divide the basin side profile 2 into several small areas for polishing in the same way as polishing the back side profile 1. The specific operation of the polishing route will not be described in detail.

[0060] S12. Select 600-800 grit flocked sandpaper as the polishing tool and repeatedly polish the leading edge side 6, trailing edge side 7, first inner groove R10, second inner groove R11, and transition R9 to improve the smoothness.

[0061] Furthermore, it should be noted that low-stress polishing is used in steps S1 to S12 to avoid deformation of the guide vanes; for example, dry polishing is used for low-stress polishing. Additionally, in step S1, measuring instruments, such as a polishing measuring instrument, are prepared to inspect the polishing results after polishing is completed, allowing for inspection after each polishing cycle.

[0062] In summary, the above-mentioned polishing method for the guide vanes at the outlet of the bypass duct can achieve efficient polishing of the guide vanes, save polishing time and manpower, greatly improve the polishing efficiency and surface integrity of the guide vanes, reduce the deformation caused by polishing, produce good surface quality, and ensure stable and reliable guide vane quality.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A polishing method for the guide vanes at the outlet of an outer bypass duct, characterized in that, include: S1. Divide the guide vane into multiple polishing areas, the polishing areas including the back side profile (1), the basin side profile (2), the honeycomb groove (3), the flow channel surface (4), the transition R (5), the leading edge side (6), the trailing edge side (7), the transition R (9), the first inner groove R (10), and the second inner groove R (11); and select the corresponding polishing tool for each polishing area; S2. Cool the outer surface of the guide vane to prevent the polishing heat from deforming the guide vane; S3. Polish the back side surface (1) to eliminate tool marks; S4. Polish the side surface of the basin (2) to remove tool marks; S5. Polish the honeycomb groove (3) to eliminate the tool marks in the honeycomb groove (3); S6. Polish the flow channel surface (4), and then polish the adapter R (5) to eliminate tool marks; S7. Polish the leading edge side (6) and the trailing edge side (7) to eliminate tool marks; S8. Polish the first inner groove R(10) to eliminate tool marks; S9. Polish the second inner groove R(11) to eliminate tool marks; S10, Polish the transition R(9) to eliminate tool marks; S11. Polish the back side profile (1) and the basin side profile (2) to improve the surface finish; S12. Polish the leading edge side (6), the trailing edge side (7), the first inner groove R (10), the second inner groove R (11), and the transition R (9) to improve the surface finish; When polishing the back side profile (1), polishing is performed along the chord length direction of the guide vane every time the guide vane travels a preset distance along its length, and the directions of two adjacent polishing operations are opposite. When polishing the basin side surface (2), polishing is performed along the chord length direction of the guide vane every time a preset distance is traveled along the length direction of the guide vane, and the directions of two adjacent polishing operations are opposite. The basin-side profile (2) and the back-side profile (1) are divided into several small areas. Each small area is polished along the chord length of the guide vane as it travels the preset distance along the length of the guide vane, and the directions of two adjacent polishing operations are opposite.

2. The polishing method for the guide vane at the outlet of the bypass duct according to claim 1, characterized in that, Compressed air is used for air cooling, and a dust collection device is used to collect the dust on the guide vanes while cooling is in progress.

3. The polishing method for the guide vane at the outlet of the bypass duct according to claim 1, characterized in that, When polishing each of the small areas continuously, the time interval between two adjacent polishing operations is greater than or equal to 10 seconds.

4. The polishing method for the guide vane at the outlet of the bypass duct according to claim 1, characterized in that, In steps S3 and S4, a rubber wheel with a thickness of 50 mm and a diameter of 200 mm and a sanding belt with a mesh size of 400-800 are selected to polish the back side profile (1) and the basin side profile (2). The amount of material removed during polishing in steps S3 and S4 is 0.03-0.05 mm, the feed speed is 500-800 mm / min, and the preset distance is 6-10 mm.

5. The polishing method for the guide vane at the outlet of the bypass duct according to any one of claims 1-4, characterized in that, In step S5, a rubber wheel with a thickness of 50 mm and a diameter of 80 mm and a 600-mesh abrasive belt are selected to polish the honeycomb groove (3); the polishing amount is 0.03~0.05 mm, the feed speed is 500~800 mm / min, and the row spacing is 6~10 mm. In step S6, a flap wheel is selected to polish the flow channel surface (4), and the polishing amount is 0.03~0.05mm; in step S6, a 6S fiber wheel with a thickness of 50mm and a diameter of 200mm is selected to polish the adapter R (5); In step S7, firstly, an oil-polishing file is selected to polish the leading edge side (6) and the trailing edge side (7), and then 240~320 grit flocked sandpaper is selected to polish the leading edge side (6) and the trailing edge side (7) again. In step S8, a sand mill is selected in conjunction with a flap wheel and 240~320 mesh flocked sandpaper to polish the first inner groove R(10); In step S9, an eccentric sand mill head is selected and 320~800 mesh flocked sandpaper is used to polish the second inner groove R(11); In step S10, a sesame seed grinding head with a diameter of 4 mm is selected to polish the transition R (9).

6. The polishing method for the guide vane at the outlet of the bypass duct according to claim 5, characterized in that, In step S11, a rubber wheel with a thickness of 50 mm and a diameter of 200 mm and a sanding belt with a mesh size of 400-800 are selected to polish the back side profile (1) and the basin side profile (2). The feed speed for polishing is 500-800 mm / min and the row spacing is 3-5 mm. In step S12, the leading edge side (6), the trailing edge side (7), the first inner groove R (10), the second inner groove R (11), and the transition R (9) are repeatedly polished using 600-800 grit flocked sandpaper as the polishing tool.

7. The polishing method for the guide vane at the outlet of the bypass duct according to claim 5, characterized in that, Between steps S4 and S5, there is also step S41, in which the polishing tool is selected as a rubber wheel with a thickness of 35mm and a diameter of 200mm and a sanding belt with a grit of 400~800 grit to polish the missed areas of the back side surface and the missed areas of the basin side surface in steps S3 and S4.

8. The polishing method for the guide vane at the outlet of the bypass duct according to claim 5, characterized in that, Step S61 is included between steps S6 and S7, in which a 6S fiber wheel with a thickness of 50 mm and a diameter of 200 mm is selected as the polishing tool to refine the flow channel surface (4) and the adapter R (5).

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