Aircraft engine flame tube drilling apparatus

Abstract

This invention provides a drilling device for aircraft engine flame tubes, belonging to the field of aircraft engine flame tube processing technology. It includes a flame tube head assembly and positioning component for positioning the flame tube head part to be drilled, a flame tube first section assembly and positioning component for positioning the first section of the flame tube to be drilled, an indexing plate component for locating the drilling position, and a drill template component for positioning the drill bit. The indexing plate component is mounted and fixed on the flame tube head assembly and positioning component. This drilling device uses two symmetrical angular positioning pins to prevent errors and uses side-mounted angular positioning blocks to check the gap between the device and the recessed area of ​​the first section of the flame tube, ensuring uniform gap between the flame tube head and the first film gas section, and qualified outlet gas pressure, thus ensuring accurate positioning during drilling. Using this structure for drilling simplifies the positioning operation and reduces operational difficulty.

Description

Technical Field

[0001] This invention belongs to the field of aircraft engine flame tube processing technology, specifically relating to an aircraft engine flame tube drilling device. Background Technology

[0002] The combustion of fuel-air mixtures takes place inside the flame tube assembly, where the temperature is highest during engine operation. The flame tube is welded from a head and nine sections of heat-resistant alloy plates. Torsion in this assembly can affect the uniformity of the temperature field at the combustion chamber outlet. Furthermore, the gaps in the film section of the flame tube serve as cooling airflow channels for the combustion chamber. Uneven gaps can cause the cooling effect of the combustion chamber to deviate from the design, leading to flame tube erosion. This can result in engine accidents, causing significant economic losses and even endangering lives.

[0003] The head of the flame tube requires the machining of numerous high-precision film cooling holes. The positions of the film cooling holes at the flame tube head and the first section of the flame tube must be machined synchronously to maintain consistent gaps. Uneven gaps in the film cooling holes will cause the cooling effect of the combustion chamber to deviate from the design, leading to flame tube ablation and potentially causing engine accidents and significant economic losses. The machining accuracy directly affects the engine's cooling efficiency and service life. However, because the flame tube head is an open annular thin-walled structure with poor rigidity, traditional external clamping or internal support fixtures are prone to clamping stress deformation. After unloading, springback will occur, causing the machined holes to shift. Furthermore, the curve of the flame tube head has an irregular clamping surface, and angular positioning relies on manual alignment, resulting in poor accuracy for repeated positioning.

[0004] Therefore, there is a need to provide a drilling device for the head of the flame tube to solve the drilling problem of the flame tube. Summary of the Invention

[0005] The purpose of this invention is to solve the problems encountered in the prior art when processing film gas holes at the head of a flame tube.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drilling device for an aircraft engine flame tube, comprising a flame tube head assembly and positioning component for positioning the flame tube head part to be drilled, a flame tube first section assembly and positioning component for positioning the first section of the flame tube to be drilled, an indexing plate component for locating the position to be drilled, and a drill template component for positioning the drill bit. The indexing plate component is mounted and fixed on the flame tube head assembly and positioning component.

[0007] The aircraft engine flame tube drilling device provided by the present invention also has the following technical features: the flame tube head assembly and positioning component includes a base, a shaft passing through the base and the flame tube to be drilled, a bearing for connecting the shaft and the base, and an alignment component provided at the other end of the shaft for aligning and pressing the flame tube head. The base is provided with an angled hole for aligning the drill bit with the center of the drill bushing on the drilling device. The indexing plate component is fixed on the base. The bearing is fixed on the shaft by a hexagonal thin nut. The alignment component includes a pad block that works in cooperation with each other, a first angular positioning pin, and an internal hexagonal set screw 16.

[0008] The aircraft engine flame tube drilling device provided by the present invention also has the following technical feature: the flame tube head assembly and positioning component further includes an adjusting washer for adjusting the connection between the adjusting shaft and the bearing.

[0009] The aircraft engine flame tube drilling device provided by the present invention also has the following technical feature: the base is used to fix the reference surface of the indexing plate component and the bottom surface at the same angle as the head angle of the flame tube to be drilled.

[0010] The aircraft engine flame tube drilling device provided by the present invention also has the following technical features: the first section assembly and positioning component of the flame tube includes a positioning plate for positioning the flame tube to be drilled, a shouldered hexagonal nut for pressing the positioning plate, a guide block fixed on the indexing plate for guiding and positioning, an angular positioning block fixed on the guide block for angular positioning, a handle fixed on the angular positioning block for picking up the angular positioning block, and a third internal hexagonal screw and a third cylindrical pin for fixing the handle.

[0011] The aircraft engine flame tube drilling device provided by the present invention also has the following technical features: the first section assembly and positioning component of the flame tube further includes a second angular positioning pin and a second insert pin for auxiliary positioning during the processing.

[0012] The aircraft engine flame tube drilling device provided by the present invention also has the following technical features: the indexing plate component includes a rotating positioning plate fixed on the flame tube head assembly positioning component and a first pin that cooperates with the rotating positioning plate.

[0013] The aircraft engine flame tube drilling device provided by the present invention also has the following technical features: the drilling template component includes a drilling template, an internal hexagon screw and a first cylindrical pin for fixing the drilling template, a height-adjusting block for adjusting the height of the drilling template, and a drill sleeve assembly for drilling, wherein the drill sleeve assembly is fixed to the drilling template by a drill sleeve screw.

[0014] Beneficial effects: The drilling device provided in this application uses two first angular locating pins to position two symmetrical trapezoidal grooves at the head of the flame tube to prevent errors. An angular locating block, whose working position shape matches the shape of the recessed area in the first section of the flame tube, checks the gap between the device and the recessed area in the first section of the flame tube, thus aligning the position of the gas film hole to be drilled in the first section of the flame tube. This ensures a uniform gap between the flame tube head and the first gas film section, and that the outlet gas pressure is qualified, resulting in accurate positioning during the drilling process. Using this structure for drilling simplifies the positioning operation and reduces the difficulty of operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the drilling device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the flame tube head assembly and positioning component provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly and positioning component for the first section of the flame tube provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the indexing plate component provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the drill template component provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the base provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the positioning pressure plate provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the rotating positioning disk provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the drilling template provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the guide block provided in an embodiment of the present invention; Figure 11 This is a top view of the drilling tool working face provided in the embodiment of the present invention. The components are as follows: 1. Base; 2. Shaft; 3. Hexagonal thin nut; 4. Bearing; 5. Adjusting washer; 6. Rotating positioning plate; 7. Heightening block; 8. Socket head screw; 9. Drill template; 10. First cylindrical pin; 11. Screw for drill bushing; 12. Drill bushing assembly; 13. Shoulder hexagonal nut; 14. Positioning pressure plate; 15. Hexagonal nut; 16. Socket head screw; 17. Spacer; 18. First angular positioning pin; 19. Bushing; 20. First pin; 21. Guide block; 22. Angular positioning block; 23. Knurled small head screw; 24. Second cylindrical pin; 25. Handle; 26. Third cylindrical pin. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0018] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, 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 limiting the invention.

[0019] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] like Figure 1-10As shown, this embodiment of the invention provides a drilling device for an aircraft engine flame tube, including a flame tube head assembly and positioning component for positioning the flame tube head part to be drilled, a flame tube first section assembly and positioning component for positioning the first section of the flame tube to be drilled, an indexing plate component for locating the drilling position, and a drill template component for positioning the drill bit. The indexing plate component is mounted and fixed on the flame tube head assembly and positioning component.

[0022] In some embodiments, the flame tube head assembly positioning component includes a base 1, a shaft 2 passing through the base 1 and the flame tube to be drilled, a bearing 4 for connecting the shaft 2 and the base 1, and an alignment component located at the other end of the shaft 2 for aligning and pressing the flame tube head. The base 1 is provided with an angled hole for aligning the drill bit with the center of the drill sleeve on the drilling device. The alignment of the drill bit and the center of the drill sleeve facilitates vertical drilling. The indexing plate component is fixed on the base 1. The bearing 4 is fixed on the shaft 2 by a hexagonal thin nut 3. The alignment component includes a pad 17 that works in conjunction with each other, a first angular positioning pin 18, and an internal hexagonal set screw 16.

[0023] In the above embodiment, shaft 2 is used to connect the flame tube head and the first section when they are fixed on the device base 1. The flame tube head is provided with a trapezoidal groove. One end of the first corner positioning pin 18 is connected to the gap of the pad, and the other end is inserted into the trapezoidal groove of the flame tube head to achieve alignment. Then, it is tightened with an internal hexagonal set screw. The pad 17 is tightened with a hexagonal nut 15.

[0024] In some embodiments, the flame tube head assembly positioning component further includes an adjusting washer 5 for adjusting the connection between the adjusting shaft 2 and the bearing 4.

[0025] In some embodiments, the base 1 is used to fix the angle between the reference surface and the bottom surface of the indexing plate component to be consistent with the head angle of the flame tube to be drilled. The consistency between the angle between the reference surface and the bottom surface and the head angle of the flame tube to be drilled is used to adjust the drilling position to a vertical direction.

[0026] In some embodiments, the first section of the flame tube assembly positioning component includes a positioning plate 14 for positioning the flame tube to be drilled, a shouldered hexagonal nut 13 for pressing the positioning plate 14, a guide block 21 fixed on the rotating positioning disk 6 for guiding positioning, an angular positioning block 22 fixed on the guide block 21 for angular positioning, a handle 25 fixed on the angular positioning block 22 for picking up the angular positioning block 22, and a second internal hexagonal screw and a third cylindrical pin 26 for fixing the handle 25.

[0027] In the above embodiment, the guide block 21 is fixed to the rotating positioning disk 6 by the second hexagon socket screw and the third cylindrical pin 26. The angular positioning block 22 is tightened onto the guide block 21 by the knurled small head screw 23. The guide block 21 and the angular positioning block 22 together realize the alignment of the position of the gas film hole to be drilled in the first section of the flame tube. It needs to be removed when machining the gas film hole. The working position shape of the angular positioning block 22 matches the shape of the recessed part in the first section of the flame tube to achieve alignment.

[0028] In some embodiments, the first section assembly and positioning component of the flame tube further includes a second angular positioning pin and a second latch for auxiliary positioning during processing. When drilling the first hole, the second angular positioning pin is inserted into the positioning hole on the first section of the flame tube for angular positioning, then drilling is performed. After drilling the first hole, the second angular positioning pin is removed. Then, the second latch is inserted into the machined first hole for angular positioning before machining the remaining holes. The size of the second latch is consistent with the size of the air film hole to be machined.

[0029] In some embodiments, the indexing plate component includes a rotating positioning plate 6 fixed to the flame tube head assembly positioning component and a first pin 20 cooperating with the rotating positioning plate 6. The rotating positioning plate 6 is connected to the shaft 2 by a first hexagon socket screw and a second cylindrical pin 24. The indexing plate component also includes a bushing 19, the position of which corresponds to the position of the gas film hole of the flame tube to be processed. The rotating positioning plate 6 is used to align the processing position of the gas film hole. The rotating positioning plate 6 needs to be rotated once for each hole drilled, which is used for positioning the first pin 20.

[0030] In some embodiments, the drill template component includes a drill template 9, an internal hexagon screw 8 and a first cylindrical pin 10 for fixing the drill template 9, a heightening block 7 for adjusting the height of the drill template 9, and a drill sleeve assembly 12 for drilling. The drill sleeve assembly 12 is fixed to the drill template 9 by a drill sleeve screw 11. The drill sleeve assembly 12 includes a first drill sleeve for guiding the drill bit and a second drill sleeve for guiding the air film hole to be drilled. The internal hexagon screw 8 is used to connect the drill template 9, and the first cylindrical pin 10 is used for positioning.

[0031] The working process of the drilling device provided in the above embodiments is as follows: Mount the flame tube head into the drilling device with the head groove facing directly downwards. Insert the first angular positioning pin 18 into the trapezoidal groove of the head. After inserting the first angular positioning pin 18, check that the clamping block fits against the upper end face of the head hole, and tighten the nut. Clamp the first section of the flame tube into the device, cover it with the cover plate, adjust the parts to align the recessed part of the first section of the flame tube with the recessed part of the head, insert the second angular positioning pin into the reference hole in the recessed part of the first section, that is, into the second positioning hole from the left, and at the same time use the angular positioning block 22 to fit against the recessed part of the first section, check that the fitting gap is not greater than 0.5, and tighten the pressure plate. Check that the pins on the indexing plate are fully inserted into the angled holes on the base. The diameter of the angled holes is 12. Insert the first pin 20 into both the rotating positioning plate 6 and the angled holes simultaneously, and quickly locate the position of the first air film hole to be processed. Start the equipment, bring the drill bit close to the workpiece surface, and adjust the nozzle to align with the drill tip. Rotate the indexing plate 6 in sequence to machine the hole manually.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A drilling device for an aircraft engine flame tube, characterized in that, It includes a flame tube head assembly and positioning component for positioning the flame tube head parts to be drilled, a flame tube first section assembly and positioning component for positioning the first section of the flame tube to be drilled, an indexing plate component for locating the drilling position, and a drill template component for positioning the drill bit. The flame tube head assembly positioning component includes a reference surface for fixing the indexing plate component and a top surface for fixing the drill template component.

2. The drilling device for the aircraft engine flame tube according to claim 1, characterized in that, The flame tube head assembly and positioning component includes a base (1), a shaft (2) passing through the base (1) and the flame tube to be drilled, a bearing (4) for connecting the shaft (2) and the base (1), and an alignment component located at the other end of the shaft (2) for aligning and pressing the flame tube head. The base (1) is provided with an angled hole for aligning the drill bit with the center of the drill sleeve on the drilling device. The indexing plate component is fixed on the base (1), and the bearing (4) is fixed on the shaft (2) by a hexagonal thin nut (3). The alignment assembly includes a pad (17) that works in conjunction with each other, a first angular positioning pin (18), and an internal hexagon set screw (16).

3. The drilling device for the aircraft engine flame tube according to claim 2, characterized in that, The flame tube head assembly positioning component also includes an adjusting washer (5) for adjusting the connection between the adjusting shaft (2) and the bearing (4).

4. The drilling device for the aircraft engine flame tube according to claim 2, characterized in that, The angle between the reference plane and the bottom plane is the same as the head angle of the flame tube to be drilled, and the top plane is parallel to the bottom plane.

5. The drilling device for the aircraft engine flame tube according to claim 1, characterized in that, The first section of the flame tube assembly positioning component includes a positioning plate (14) for positioning the flame tube to be drilled, a shouldered hexagonal nut (13) for pressing the positioning plate (14), a guide block (21) fixed on the indexing plate component for guiding positioning, an angular positioning block (22) fixed on the guide block (21) for angular positioning, a handle (25) fixed on the angular positioning block (22) for picking up the angular positioning block (22), and a second internal hexagonal screw and a third cylindrical pin (26) for fixing the handle (25).

6. The drilling device for the aircraft engine flame tube according to claim 5, characterized in that, The first section assembly and positioning component of the flame tube also includes a second angular positioning pin (26) and a second latch for auxiliary positioning during the processing.

7. The drilling device for the aircraft engine flame tube according to claim 1, characterized in that, The indexing plate component includes a rotating positioning plate (6) fixed on the flame tube head assembly positioning component and a first pin (20) that cooperates with the rotating positioning plate (6).

8. The drilling device for the aircraft engine flame tube according to claim 1, characterized in that, The drill template component includes a drill template (9), an internal hexagon screw (8) for fixing the drill template and a first cylindrical pin (10), a heightening block (7) for adjusting the height of the drill template, and a drill sleeve assembly (12) for drilling holes. The drill sleeve assembly (12) is fixed to the drill template (9) by a drill sleeve screw (11).

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