Countersinking method and countersinking device for the flow channel surface of the guide beam of an aircraft thrust reverser.

Abstract

This invention discloses a countersinking method and device for the flow channel surface of a guide beam in an aircraft thrust reverser. The countersinking device mainly consists of an air gun, a transmission device, an adapter, a retaining ring, and a special countersinking drill. The transmission device and the adapter are connected by a hexagonal rod on the adapter passing through a hexagonal hole in the transmission device, and the adapter is locked with a retaining ring to prevent it from falling off. The special countersinking drill is then installed onto the adapter via a threaded connection. During countersinking, the air gun and transmission device are held to ensure stable and vertical feeding of the special countersinking drill. The countersinking device and method of this invention can adapt to the confined space of the flow channel surface of the guide beam in an aircraft thrust reverser, avoiding interference and ensuring that the countersunk hole is perpendicular to the flow channel surface after machining. Furthermore, it can guarantee the flatness of the subsequent countersunk screws and the flow channel surface.

Description

Technical Field

[0001] This invention belongs to the field of aerospace product machining technology, specifically a countersinking device in a confined space and a countersinking method for the flow channel surface of the guide beam of an aerospace thrust reverser device. Background Technology

[0002] like Figure 1 The diagram shows a guide beam used in an aircraft thrust reverser. Due to engine structural requirements, guide beams are complex and irregularly shaped parts. A partial diagram shows that the first curved surface 8 containing the countersunk hole 6 forms an angle of less than 90° with the adjacent second curved surface 7. When machining the countersunk hole 6, the hole's axis must be perpendicular to the first curved surface 8, which is the airflow channel surface of the aircraft thrust reverser. After installing the countersunk screw, a high degree of surface flatness is required. Due to the part's structural limitations, using a conventional countersunk drill cannot meet the perpendicularity requirement between the hole and the first curved surface 8, and after installing the countersunk screw, the flatness of the screw head relative to the first curved surface 8 cannot be satisfied. Because the part is large and requires machining a large number of holes, using a reverse countersunk drill (i.e., from...) is not feasible. Figure 1 The machining of the left side of the first curved surface 8 requires two operators to work together, and the countersinking drill needs to be installed and removed every time a hole is countersinked, which wastes manpower and a lot of time. Summary of the Invention

[0003] This invention aims to provide a method and apparatus for countersinking the flow channel surface of a guide beam for an aircraft thrust reverser device. It overcomes the technical bottleneck of the difficulty in countersinking countersinks in narrow spaces for irregularly shaped parts such as guide beams for aircraft thrust reversers. The countersinking apparatus has the advantages of simple structure, convenient operation and high processing efficiency. It can meet the countersinking drilling requirements of the guide beam and ensure the perpendicularity of the countersink and the flatness of the subsequent flow channel surface after processing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The countersinking device includes:

[0006] An air gun, which serves as a power source to output torque;

[0007] The transmission device has its input end connected to the output end of the air gun, and its output end outputs torque, with the axis of rotation of the torque parallel to the axis of rotation of the output torque of the air gun.

[0008] An adapter, the first end of which is connected to the output end of the transmission device;

[0009] A special countersink drill is connected to the second end of an adapter.

[0010] Furthermore, the transmission device is a gearbox, which includes multiple gears with parallel rotating shafts that mesh with each other.

[0011] Furthermore, the output end of the transmission device includes an internal hexagonal structure, and the first end of the adapter has an external hexagonal structure.

[0012] Furthermore, the adapter's external hexagonal structure is also equipped with a retaining ring, which passes through the internal hexagonal hole structure of the transmission device and is then limited to the transmission device by the retaining ring.

[0013] Furthermore, the special countersink drill is connected to the second end of the adapter via a thread.

[0014] Furthermore, the end of the special countersink drill has a guide structure.

[0015] A method for countersinking the flow channel surface of a guide beam for an aircraft thrust reverser device, wherein the flow channel surface is a first curved surface with multiple countersunk holes to be machined, and one side of the first curved surface is a second curved surface, the angle between the first and second curved surfaces being less than 90°, employing the aforementioned dedicated countersinking drill with a guide structure, and comprising:

[0016] Step 1: Estimate the straight-line distance from the countersunk hole to the second curved surface along the axis of the countersunk hole to be processed. Determine the length of the special countersunk drill and adapter based on the straight-line distance, and ensure that there is still a margin after subtracting the length of the special countersunk drill and adapter from the straight-line distance.

[0017] Step 2: Estimate the length of the transmission device to ensure that the air gun connected to the input end of the transmission device does not interfere with the second curved surface during the feeding and withdrawal of the special countersink drilling process, and that the input end of the transmission device is located outside the space area surrounded by the first and second curved surfaces.

[0018] Step 3: Place the countersunk device between the first curved surface and the second curved surface, and then use the guide structure on the special countersunk drill to cooperate with the hole position where the countersunk hole to be processed is located to send the special countersunk drill into the hole position. Then, according to the size of the angle between the first curved surface and the second curved surface, use the adapter as the rotating axis to rotate the transmission device and the air gun synchronously, so that the transmission device and the air gun move away from the second curved surface.

[0019] Step four: Hold the transmission device firmly at one end outside the space area surrounded by the first and second curved surfaces with one hand, and hold the air gun firmly with the other hand and start the air gun to perform the countersinking operation.

[0020] Compared with the prior art, the present invention has the following characteristics:

[0021] 1. The countersinking device of the present invention solves the technical bottleneck problem of difficult countersinking of countersunk holes in narrow spaces of irregular parts such as guide rail beams. It overcomes the interference problem caused by the second curved surface and the problem of poor countersinking perpendicularity when countersinking from the first curved surface. One operator can complete the process independently without the need for two operators to cooperate in reverse countersinking.

[0022] 2. This invention introduces a transmission device, which shifts the connection position between the countersink drill and the air gun away from the first curved surface. This allows the transmission device to be held by hand during countersinking operations, adding a gripping point. Since this gripping point is closer to the countersink drill and the countersunk hole, it reduces the probability of the countersink drill wobbling during feeding, improving the quality of the countersinking. Combined with the guide structure on the countersink drill, it ensures the perpendicularity of the final countersunk hole to the flow channel surface.

[0023] 3. The countersinking device has a simple structure, is easy to operate, and has high production efficiency. The transmission device adopts a gearbox structure, and the size of the gearbox and the angle relative to the air gun can be adjusted according to parameters such as the position of the countersunk hole on the flow channel surface, the angle between the second curved surface and the flow channel surface, and the length of the countersinking drill and the adapter. This ensures that there is no interference in the countersinking process. The countersinking drill speed can also be adjusted by changing the gear transmission ratio in the gearbox, thereby improving the countersinking efficiency and quality.

[0024] 4. Compared to flexible shaft drives, gearboxes have better rigidity, are easier to hold, and have greater adjustability in size and transmission ratio. They can ensure the verticality after countersinking and will not produce the unexpected swaying that occurs with flexible shafts, making them more suitable for countersinking applications with high precision requirements. Attached Figure Description

[0025] Figure 1 A partial schematic diagram of the guide rail beam used in an aircraft thrust reverser device;

[0026] Figure 2 A schematic diagram of a countersinking device in a confined space;

[0027] Figure 3 This is a schematic diagram illustrating the state of countersinking using a countersinking device;

[0028] In the diagram, 1-air gun, 2-transmission device, 3-adapter, 4-circlip, 5-special countersunk drill, 6-countersunk hole, 7-second curved surface, 8-first curved surface. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0030] like Figure 2 As shown, this embodiment designs a countersinking device for confined spaces, mainly composed of an air gun 1, a transmission device 2, an adapter 3, a retaining spring 4, and a dedicated countersinking drill 5. The transmission device 2 and the adapter 3 are connected by a hexagonal rod on the adapter 3 passing through a hexagonal hole in the transmission device 2, and the adapter 3 is locked in place by the retaining spring 4 to prevent it from falling off. The dedicated countersinking drill 5 is installed on the adapter 3 via a threaded connection.

[0031] The transmission device 2 is a gearbox. In this embodiment, the gearbox includes three parallel and meshing gears with a transmission ratio of 1. The input end of the gearbox is connected to the air gun 1 via a transmission shaft. The output end of the gearbox has a hexagonal inner hole corresponding to the gear, which mates with the hexagonal rod of the adapter 3. Figure 3 The length of the gearbox

[0032] The end of the dedicated countersunk drill 5 has a guide structure that aligns with the inner contour of the countersunk hole to be machined on the flow channel surface (first curved surface 8), thus ensuring perpendicularity during countersunk. With the guide structure of the dedicated countersunk drill 5 ensuring the perpendicularity between the countersunk hole and the flow channel surface, the rivet head will also be perpendicular to the flow channel surface during subsequent rivet installation, thereby ensuring the flatness of the rivet head and the flow channel surface.

[0033] Before machining the countersunk hole 6, select the countersunk device according to the following method:

[0034] Step 1: Estimate the straight-line distance from the countersunk hole 6 to the second curved surface 7 along the axis of the countersunk hole 6 to be processed. Determine the length of the special countersunk drill 5 and the adapter 3 based on the straight-line distance. Ensure that there is still a margin after subtracting the length of the special countersunk drill 5 and the adapter 3 from the straight-line distance. This margin is used for the feed and withdrawal during countersunk.

[0035] Step 2: Estimate the length of the transmission device 2 to ensure that the air gun 1 connected to the input end of the transmission device 2 does not interfere with the second curved surface 7 during the feeding and retraction of the special countersink drill 5, and that the input end of the transmission device 2 is located outside the space area surrounded by the first curved surface 8 and the second curved surface 7.

[0036] After the countersinking device is selected, assemble the countersinking device according to the following steps:

[0037] Step 1: Install adapter 3 onto transmission device 2 and lock adapter 3 in place using snap ring 4.

[0038] Step 2: Install the special countersink drill 5 onto the adapter 3.

[0039] Step 3: Connect the air gun 1 to the air source.

[0040] After completing the above assembly, the countersunk hole 6 in the confined space is countersunk, and the specific process is as follows:

[0041] Step one: Place the countersinking device between the first curved surface 8 and the second curved surface 7. Then, using the guide structure on the special countersinking drill 5 to align with the location of the countersunk hole 6 to be machined, feed the special countersinking drill 5 into the hole. Then, based on the angle between the first curved surface 8 and the second curved surface 7, rotate the transmission device 2 and the air gun 1 synchronously with the adapter 3 as the axis of rotation. This ensures that the transmission device 2 and the air gun 1 are moved away from the second curved surface 7, guaranteeing that there is sufficient space between the second curved surface 7 and the transmission device 2 after rotation for holding one end of the transmission device 2. Figure 3 As shown, the lower end of the transmission device 2 is used for gripping during operation;

[0042] Step two: Hold the transmission device 2 with one hand at the end outside the space area surrounded by the first curved surface 8 and the second curved surface 7, and hold the air gun 1 with the other hand and start the air gun 1 to perform the countersinking operation.

[0043] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for tapping a flow channel surface of an aero-reverse thrust device guide rail beam, the flow channel surface being a first curved surface (8) having a plurality of tapped holes (6) to be machined, the first curved surface (8) having a second curved surface (7) on one side, the first curved surface (8) and the second curved surface (7) having an angle less than 90°, characterized in that: the tapping device comprises: an air gun (1) serving as a power source to output torque; a transmission device (2) having an input end connected to an output end of the air gun (1) and an output end outputting torque, the output end of the transmission device (2) having a rotation axis parallel to a rotation axis of the output torque of the air gun (1), the transmission device (2) being a gear box comprising a plurality of gears having parallel rotation axes and being meshed with each other; an adapter (3) having a first end connected to the output end of the transmission device (2); and a special tapping drill (5) connected to a second end of the adapter (3) and having a guide structure on an end thereof; and the tapping method comprises: Step 1: estimating a straight line distance from the tapped hole (6) to be machined to the second curved surface (7) along an axis direction of the tapped hole (6) to be machined, determining lengths of the special tapping drill (5) and the adapter (3) according to the straight line distance, and ensuring that the straight line distance minus the lengths of the special tapping drill (5) and the adapter (3) still has a margin; Step 2: estimating a length of the transmission device (2) to ensure that the air gun (1) connected to the input end of the transmission device (2) has no interference with the second curved surface (7) during feeding and withdrawing of the special tapping drill (5) and the input end of the transmission device (2) is located outside a space region enclosed by the first curved surface (8) and the second curved surface (7); Step 3: placing the tapping device between the first curved surface (8) and the second curved surface (7), sending the special tapping drill (5) into a hole position by cooperating the guide structure on the special tapping drill (5) with the hole position of the tapped hole (6) to be machined, and rotating the transmission device (2) and the air gun (1) synchronously with the adapter (3) as a rotation axis according to an angle between the first curved surface (8) and the second curved surface (7) to make the transmission device (2) and the air gun (1) move away from the second curved surface (7); and Step 4: holding one end of the transmission device (2) located outside the space region enclosed by the first curved surface (8) and the second curved surface (7) with one hand and holding the air gun (1) and starting the air gun (1) to perform tapping operation with the other hand. The output end of the transmission device (2) comprises an inner hexagonal structure, and the first end of the adapter (3) is an outer hexagonal structure. The outer hexagonal structure of the adapter (3) is further provided with a circlip (4), and the outer hexagonal structure is limited on the transmission device (2) by the circlip (4) after penetrating the inner hexagonal structure of the transmission device (2). The second end of the special tapping drill (5) and the adapter (3) are connected by threads. ​ ​ ​ ​ ​ ​ ​ 2. A method of dimpling the flow face of an aircraft thrust reverser duct beam rail according to claim 1, characterised in that: ​ 3. A method of dimpling the flow face of an aircraft thrust reverser duct beam rail according to claim 2, characterised in that: ​ 4. A method of dimpling the flow face of an aircraft thrust reverser duct beam rail according to claim 1, characterised in that: ​

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