Rapid drilling tool for closed-angle structural area of airplane and use method of rapid drilling tool for closed-angle structural area of airplane

Abstract

The invention discloses a rapid drilling tool for an aircraft closed angle structural area and a using method, and belongs to the technical field of aircraft assembly.The rapid drilling tool comprises a mechanical structure part, a control box and a power module, the power module is responsible for supplying power, the control box is responsible for controlling the rotating speed, and the mechanical structure part is provided with two high-hardness steel bevel gears; wherein one high-hardness steel bevel gear is connected with the brushless motor, the other high-hardness steel bevel gear is connected with the drill bit, the direction of the drill bit is changed through 90-degree meshing of the two high-hardness steel bevel gears, 90-degree steering drilling is achieved, and the purpose of reducing the boundary dimension of the tool is achieved. According to the method, primary hole guiding and manufacturing of the closed-angle structural area of the aircraft can be achieved, and the situations that due to interference between a tool and the aircraft structure, hole manufacturing is limited, hole positions are inaccurate, and holes are not perpendicular are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft assembly, and relates to a rapid hole-making tool and a using method for the closed-angle structure area of an aircraft, in particular to a rapid drilling intelligent device for aircraft structural parts, which is used for the primary hole drilling of parts and fittings in the closed-angle structure area of an aircraft. Background Art

[0002] Aircraft assembly structural parts are usually connected and fixed by standard parts such as bolts and rivets. Before the connection of standard parts, the assembly holes need to be drilled. According to the design requirements of the aircraft, the number of aircraft assembly holes is hundreds of thousands, and at the same time, the drilling positions and the perpendicularity of the holes must meet the specified requirements. The aircraft assembly hole positions play an important role in the aircraft structure. If the hole positions do not meet the design requirements, the overall strength of the aircraft structure will be affected. At the same time, it is necessary to ensure the perpendicularity of the holes. If there are quality problems such as hole inclination after hole making, then assembly stress will be caused after installing the standard parts, resulting in cracks in the structural parts, and ultimately affecting the body structure strength of the aircraft.

[0003] At present, ordinary pneumatic drills are usually used for drilling the primary holes of structural parts, and then reaming or boring is carried out. In the closed-angle areas of some structures with small space, due to the large volume of ordinary pneumatic drills, there will be interference with the aircraft structure during drilling, resulting in inability to drill holes in small areas, or inability to ensure the perpendicularity of the primary holes due to limited space. In the structural areas where ordinary pneumatic drills cannot drill, plate drills are generally used for drilling. A plate drill is to fix a Z-shaped connector on a pneumatic drill and then drill holes. This structural form can solve the interference between the pneumatic drill and the part structure, but the plate drill still has the following disadvantages: 1) The form of the plate drill is single and the external dimensions are limited, and there will still be interference problems with parts in some special small areas; 2) When using the plate drill to drill holes, the plate drill will shake, causing the drill bit to shake and affecting the hole accuracy. At the same time, when using the plate drill to drill holes, it is necessary to manually fix the position of the plate drill, and the operation is unstable and difficult. Therefore, for hole making in the closed-angle structure area of small space, the hole-making capabilities of traditional pneumatic drills and plate drills are limited, and the hole positions and hole perpendicularity cannot be guaranteed in special areas. If there are problems such as incorrect hole positions and non-compliance of hole perpendicularity in aircraft assembly holes, it will seriously affect the product quality and the product delivery schedule. Summary of the Invention

[0004] In order to solve the above problems, the invention provides a rapid hole-making tool and a using method for the closed-angle structure area of an aircraft, so as to solve the problems such as inaccurate hole-making positions and difficult-to-guarantee hole-making perpendicularity in the closed-angle areas of aircraft parts and fittings. The invention can not only ensure accurate hole-making positions, but also ensure hole-making perpendicularity, and finally improve the hole-making quality and product production efficiency.

[0005] The invention adopts the following technical solutions:

[0006] A rapid hole-making tool for the closed-angle structure area of an aircraft. The rapid hole-making tool includes a mechanical structure part, a control box 19, and a power supply module 27.

[0007] The mechanical structure part includes a bracket 1, a motor base 2, a first bearing 3, a retaining piece 4, a drill bit 5, self-tapping screws 6, a first steel bevel gear 7, a second steel bevel gear 8, a setscrew 9, a second bearing 10, a bolt 11, a coupling 12, a brushless motor 13, a connecting shaft 14, a housing 15, and fixing screws 16.

[0008] The motor base 2 is L-shaped. The brushless motor 13 is fixed on its bottom plate, and its side plate is provided with grid openings for motor heat dissipation. The output shaft of the brushless motor 13 extends upward. The bracket 1 is the main supporting member, which is mounted above the brushless motor 13, and its bottom is fixed on the motor base 2 by the bolt 11. A round hole is made on its upper surface, and the second bearing 10 is installed in the round hole. Two support plates arranged oppositely are provided on both sides of the round hole. Coaxial round holes and circular grooves are made on the two support plates respectively. The first bearing 3 is installed in the round hole. The two ends of the coupling 12 are respectively connected to the output shaft of the brushless motor 13 and the connecting shaft 14 through the setscrew 9. The connecting shaft 14 is fixed to the inner hole of the second bearing 10 and extends upward. The second bearing 10 is used to limit the output shaft of the brushless motor 13 to prevent it from shaking. The gear side of the second steel bevel gear 8 faces upward and is fixed to the upper end of the connecting shaft 14 through the setscrew 9. The drill bit 5 is fixed in the inner hole of the first bearing 3 on one side support plate of the bracket 1 so that it can rotate freely. Its tail is inserted into the circular groove on the other support plate for position limitation to ensure that the drill bit 5 does not shake when rotating. The first steel bevel gear 7 is inserted into and fixed to the drill bit 5 through the setscrew 9. Its gear side is in a 90-degree meshing state with the second steel bevel gear 8, and the other end face is in contact with the bracket 1. When the brushless motor 13 rotates, the second steel bevel gear 8 is driven to rotate synchronously through the coupling 12 and the connecting shaft 14. The second steel bevel gear 8 drives the first steel bevel gear 7 and the drill bit 5 to rotate synchronously. The retaining piece 4 is fixed to the support plate of the bracket 1 where the first bearing 3 is installed through two self-tapping screws 6 and is located on the side away from the first steel bevel gear 7 to limit the first bearing 3 and prevent the first bearing 3 from falling due to the vibration generated by the high-speed rotation of the drill bit 5. The housing 15 is fixed to the bracket 1 through four fixing screws 16, and the housing 15 is held for hole-making operations.

[0009] Inside the described control box 19, an electronic speed control module 21 is provided. Outside, there are a speed control knob 17, a switch 18, a motor connector 20, and a control box power connector 22. The switch 18 can turn the control box 19 on and off. The speed control knob 17 is connected to the electronic speed control module 21. The maximum current of the electronic speed control module 21 is 40A. The current of the electronic speed control module 21 is adjusted through the speed control knob 17, thereby realizing the speed regulation of the brushless motor 13. The speed regulation range is 0 - 25000 revolutions. The motor connector 20 is a three-phase connector, which is internally connected to the electronic speed control module 21 and externally connected to the three-phase motor wires of the brushless motor 13 through a cable. The control box power connector 22 is connected to the power supply module 27 to achieve power supply.

[0010] On the described power supply module 27, there are a power output connector 23, a current adjustment knob 24, a voltage adjustment knob 25, and a display screen 26. The power output connector 23 is connected to the power connector 22 on the control box 19 through a cable. The power supply module 27 is an adjustable DC regulated power supply. The output voltage is adjusted to 0 - 20V through the voltage adjustment knob 25, and the output current is adjusted to 0 - 30A through the current adjustment knob 24. The display screen 26 can display the specific current and voltage values under no-load and load conditions. According to the voltage control requirements of the brushless motor 13, the stable voltage is output through the power output connector 23.

[0011] Further, the motor base 2 is made of PLA material by 3D printing.

[0012] Further, the bracket 1 is made of alloy steel material.

[0013] A usage method of the above-mentioned rapid hole-making tool for the closed-angle structure area of an aircraft, the usage method includes the following steps:

[0014] Step 1: Preparation of mechanical components. Use an inner hexagon wrench to ensure that the set screw 9 is firmly connected to the first steel bevel gear 7, the second steel bevel gear 8, and the coupling 12 to avoid loosening. Apply lubricating oil to the first steel bevel gear 7 and the second steel bevel gear 8 to ensure smooth gear meshing, reduce resistance, and install the housing 15 through the fixing screw 16.

[0015] Step 2: Adjust the power supply module 27. Turn on the power supply module 27. According to the rotational speed requirements of the material of the structure to be drilled and the hole-making drill speed and working voltage requirements of the brushless motor 13, adjust the working voltage and the upper limit current value of the circuit through the current adjustment knob 24 and the voltage adjustment knob 25 to ensure the normal operation of the brushless motor 13 and the circuit. The current and voltage values can be shown on the display screen 26.

[0016] Step 3: Cable connection. After the power module 27 is adjusted, temporarily turn off the power module 27. Connect the power output connector 23 to the power connector 22 of the control box 19 through a cable to transmit the output voltage of the power module 27 to the control box 19. Connect the three-phase motor wires of the brushless motor 13 to the motor connector 20 through a cable.

[0017] Step 4: Turn on the control box 19. Before turning on, ensure that the speed control knob 17 has been adjusted to the lowest. Turn on the power module 27, turn on the switch 18, and the control box 19 is powered on. Place the tool bit on the area of the closed-angle structure to be drilled, and adjust the speed of the brushless motor 13 to the specified speed through the speed control knob 17.

[0018] Step 5: Drilling. Align the drill bit 5 of the quick drilling tool with the position to be drilled, and adjust the angle between the drill bit 5 and the position to be drilled to ensure that the position and perpendicularity of the initial hole meet the requirements. Drill the hole according to the requirements of the digital model. After drilling is completed, turn the speed control knob 17 to the lowest, turn off the switch 18 and the power module 27, disconnect the cable, and organize the tools.

[0019] Step 6: If during the drilling process, it is found that the drill bit 5 is laborious to drill, it indicates that the drill bit is severely worn and needs to be replaced. Use the supporting hexagon wrench to remove the set screw 9 on the first steel bevel gear 7, pull out the original drill bit, replace it with a new drill bit, and tighten the set screw 9 again for fastening.

[0020] Advantages of the present invention: Compared with traditional drilling tools, the present invention is small in size and convenient to operate, avoiding the interference between the previous tools and the aircraft structure, and can realize rapid drilling in narrow spaces and closed-angle structure areas, ensuring the accuracy of the drilling position and the perpendicularity of the drilled hole. The tool of the present invention uses an electric method instead of a pneumatic method, and is driven by a high-power brushless motor, with large torque and a maximum speed of up to 25,000 revolutions. At the same time, it is equipped with a large-current intelligent electronic speed control module, which can realize the smooth speed regulation of the motor and meet the specified speed requirements. By changing the drill bit direction through two high-hardness steel bevel gears, 90-degree turning drilling is realized, achieving the purpose of reducing the external dimension of the tool. At the same time, compared with traditional pneumatic drills, the tool of the present invention can adjust the drilling speed through the electronic speed control module, adjust the rotational speed of the drill bit to the specified requirements, and avoid damage to the parts caused by too fast or too slow drilling speed. Through the use of this tool, the initial hole guiding of the closed-angle structure area of the aircraft can be realized, avoiding the situation of limited drilling due to the interference between the tool and the aircraft structure, resulting in inaccurate hole positions and non-perpendicular holes. The present invention can be widely applied to the narrow spaces and closed-angle structure areas of aircraft parts and assemblies, improve the drilling method, improve the drilling quality and efficiency, and avoid product quality problems caused by tool problems. Description of the Drawings

[0021] Figure 1 Isometric schematic of the mechanical structure part of the quick drilling tool of the present inventionFigure 1 ;

[0022] Figure 2 Isometric schematic of the mechanical structure part of the rapid hole-making tool of the present invention Figure 2 ;

[0023] Figure 3 Left side schematic of the mechanical structure part of the rapid hole-making tool of the present invention;

[0024] Figure 4 Isometric schematic of the mechanical structure part of the rapid hole-making tool of the present invention Figure 3 ;

[0025] Figure 5 Schematic of the control box of the rapid hole-making tool of the present invention Figure 1 ;

[0026] Figure 6 Schematic of the control box of the rapid hole-making tool of the present invention Figure 2 ;

[0027] Figure 7 Schematic of the power supply module of the rapid hole-making tool of the present invention;

[0028] Figure 8 Isometric schematic of the bracket structure;

[0029] Figure 9 Overall schematic of the rapid hole-making tool of the present invention.

[0030] Among them, 1 - bracket, 2 - motor base, 3 - first bearing, 4 - retaining piece, 5 - drill bit, 6 - self-tapping screw, 7 - first steel bevel gear, 8 - second steel bevel gear, 9 - setscrew, 10 - second bearing, 11 - bolt, 12 - coupling, 13 - brushless motor, 14 - connecting shaft, 15 - housing, 16 - fixing screw, 17 - speed control knob, 18 - switch, 19 - control box, 20 - motor connector, 21 - electronic speed controller module, 22 - control box power connector, 23 - power output connector, 24 - current adjustment knob, 25 - voltage adjustment knob, 26 - display screen, 27 - power supply module. Specific embodiments

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will describe the specific embodiments of the present invention in detail according to the technical solutions.

[0032] A rapid hole-making tool for the closed-angle structure area of an aircraft, the rapid hole-making tool includes a mechanical structure part, a control box 19 and a power supply module 27, as Figure 9 .

[0033] The described mechanical structure part includes a bracket 1, a motor base 2, a first bearing 3, a retaining plate 4, a drill bit 5, a self-tapping screw 6, a first bevel gear 7, a second bevel gear 8, a setscrew 9, a second bearing 10, a bolt 11, a coupling 12, a brushless motor 13, a connecting shaft 14, a housing 15, and a fixing screw 16, as Figures 1 to 4 .

[0034] The described motor base 2 is L-shaped and made of PLA material by 3D printing. The bottom plate thereof fixes the brushless motor 13, and its side plate is provided with grid openings for motor heat dissipation. The output shaft of the brushless motor 13 extends upward. It is a high-speed and high-torque motor with a KV value of 2300; the described bracket 1 is the main supporting member (as Figure 8 ), made of alloy steel material. The lower half thereof is a portal frame, mounted above the brushless motor 13, and its bottom is fixed to the motor base 2 by a bolt 11. The upper half thereof is a box-shaped frame, which is communicated with the lower half. The upper surface of the box-shaped frame is made with a round hole with an inner diameter of 8 mm. The second bearing 10 is installed in the round hole. The inner diameter of the second bearing 10 is 3 mm, the outer diameter is 8 mm, and the thickness is 4 mm. Two support plates arranged oppositely are provided on both sides of the round hole. Coaxial round holes and circular grooves are respectively made on the two support plates. The diameter of the circular groove is 3 mm, and the inner diameter of the round hole is 6 mm. The first bearing 3 is installed in the hole. The inner diameter of the first bearing 3 is 3 mm, the outer diameter is 6 mm, and the thickness is 2 mm; the inner diameter of the coupling 12 is 3 mm, and the length is 20 mm. The two ends are respectively connected to the output shaft of the brushless motor 13 and the connecting shaft 14 by setscrews 9. The connecting shaft 14 is a round shaft with an outer diameter of 3 mm and a length of 15 mm, fixed to the inner hole of the second bearing 10 and extending upward. The second bearing 10 is used to limit the output shaft of the brushless motor 13 to prevent shaking; the gear side of the second bevel gear 8 faces upward and is fixed to the upper end of the connecting shaft 14 by a setscrew 9; the drill bit 5 is fixed in the inner hole of the first bearing 3 on one side support plate of the bracket 1, enabling it to rotate freely. Its tail is inserted into the circular groove on the other support plate for position limitation to ensure that the drill bit 5 does not shake during rotation; the first bevel gear 7 is inserted and fixed to the drill bit 5 by a setscrew 9. Its gear side is in a 90-degree meshing state with the second bevel gear 8, and the other end face is in contact with the bracket 1. When the brushless motor 13 rotates, the second bevel gear 8 is driven to rotate synchronously through the coupling 12 and the connecting shaft 14. The second bevel gear 8 drives the first bevel gear 7 and the drill bit 5 to rotate synchronously; the retaining plate 4 is fixed to the support plate of the bracket 1 where the first bearing 3 is installed by two self-tapping screws 6, and is located on the side far from the first bevel gear 7 to limit the first bearing 3 and prevent the first bearing 3 from falling due to the vibration generated by the high-speed rotation of the drill bit 5; the housing 15 is fixed to the bracket 1 by four fixing screws 16, and the housing 15 is held for hole-making operation.

[0035] AsFigure 5 and Figure 6 Inside the control box 19, an electronic speed control module 21 is provided. Outside, a speed control knob 17, a switch 18, a motor connector 20, and a control box power connector 22 are provided. The switch 18 can turn the control box 19 on and off. The speed control knob 17 is connected to the electronic speed control module 21. The maximum current of the electronic speed control module 21 is 40A. The current of the electronic speed control module 21 is adjusted through the speed control knob 17, thereby realizing speed regulation of the brushless motor 13. The speed regulation range is 0 - 25,000 revolutions. The motor connector 20 is a three-phase connector, which is internally connected to the electronic speed control module 21 and externally connected to the three-phase motor wires of the brushless motor 13 through a cable. The control box power connector 22 is connected to the power module 27 to achieve power supply.

[0036] Such as Figure 7 On the power module 27, a power output connector 23, a current adjustment knob 24, a voltage adjustment knob 25, and a display screen 26 are provided. The power output connector 23 is connected to the power connector 22 on the control box 19 through a cable. The power module 27 is an adjustable DC regulated power supply. The output voltage is adjusted to 0 - 20V through the voltage adjustment knob 25, and the output current is adjusted to 0 - 30A through the current adjustment knob 24. The display screen 26 can display the specific current and voltage values under no-load and load conditions. According to the voltage control requirements of the brushless motor 13, the stable voltage is output through the power output connector 23.

[0037] A usage method of the above-mentioned rapid hole-making tool for the closed-angle structure area of an aircraft, the usage method includes the following steps:

[0038] Step 1: Preparation of mechanical components. Use an Allen wrench to ensure that the setscrew 9 is firmly connected to the first steel bevel gear 7, the second steel bevel gear 8, and the coupling 12 to avoid loosening. Apply lubricating oil to the first steel bevel gear 7 and the second steel bevel gear 8 to ensure smooth gear meshing, reduce resistance, and install the housing 15 through the fixing screw 16.

[0039] Step 2: Adjust the power module 27. Turn on the power module 27. According to the rotational speed requirements of the structure material to be drilled and the hole-making drill speed and working voltage requirements of the brushless motor 13, adjust the working voltage to 11.5V and the circuit upper limit current value to 30A through the current adjustment knob 24 and the voltage adjustment knob 25 to ensure normal operation of the brushless motor 13 and the circuit. The current and voltage values can be shown on the display screen 26.

[0040] Step 3: Cable connection. After the power module 27 is adjusted, temporarily turn off the power module 27. Connect the power output connector 23 to the power connector 22 of the control box 19 through a cable to transmit the output voltage of 11.5V of the power module 27 to the control box 19. Connect the three-phase motor wires of the brushless motor 13 to the motor connector 20 through a cable.

[0041] Step 4: Turn on the control box 19. Before turning it on, ensure that the speed control knob 17 has been adjusted to the lowest level. Turn on the power module 27, turn on the switch 18, and power on the control box 19. Place the tool bit on the area of the closed-angle structure to be drilled, and adjust the speed of the brushless motor 13 to the specified speed through the speed control knob 17.

[0042] Step 5: Drilling. Align the drill bit 5 of the quick drilling tool with the position to be drilled, and adjust the angle between the drill bit 5 and the position to be drilled to ensure that the position and perpendicularity of the initial hole meet the requirements. Drill the hole according to the requirements of the digital model. After drilling is completed, adjust the speed control knob 17 to the lowest level, turn off the switch 18 and the power module 27, disconnect the cable, and tidy up the tools.

[0043] Step 6: If it is found that the drill bit 5 is laborious during the drilling process, it indicates that the drill bit is severely worn and needs to be replaced. Use the supporting hexagon wrench to remove the set screw 9 on the first steel bevel gear 7, pull out the original drill bit, replace it with a new drill bit, and tighten the set screw 9 again for fastening.

[0044] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rapid hole-making tool for the closed-angle structure area of an aircraft, characterized in that The described rapid hole-making tool includes a mechanical structure part, a control box (19), and a power supply module (27); the power supply module (27) is connected to the control box (19) through a cable, and is used for power supply and setting the upper limits of voltage and current. The control box (19) is connected to the brushless motor (13) in the mechanical structure part through a cable, and is used for controlling the rotation speed of the brushless motor (13); the described mechanical structure part includes two steel bevel gears, one of which is connected to the output shaft of the brushless motor (13), and the other is connected to the drill bit (5). The two steel bevel gears are meshed at 90°, realizing hole-making with a 90-degree turn.

2. The rapid hole-making tool for the closed-angle structure area of an aircraft according to claim 1, wherein The described mechanical structure part includes a bracket (1), a motor base (2), a first bearing (3), a drill bit (5), a first steel bevel gear (7), a second steel bevel gear (8), a coupling (12), a brushless motor (13), a connecting shaft (14), and a housing (15); The brushless motor (13) is fixed on the motor base (2), and the output shaft of the brushless motor (13) extends upward; the bracket (1) is mounted above the brushless motor (13), and its bottom is fixed on the motor base (2). A round hole is made on its upper surface, and a support plate is provided beside the round hole. A round hole is made on the support plate, and the first bearing (3) is installed in the round hole; both ends of the coupling (12) are respectively connected to the output shaft of the brushless motor (13) and the connecting shaft (14), and the connecting shaft (14) passes upward through the round hole on the upper surface of the bracket (1); the gear side of the second steel bevel gear (8) is fixed upward at the upper end of the connecting shaft (14); the drill bit (5) passes through the first bearing (3) and is fixed in its inner hole; the first steel bevel gear (7) is inserted into and fixed on the drill bit (5), its gear side is in a 90-degree meshing state with the second steel bevel gear (8), and the other end face is in contact with the bracket (1); the housing (15) is fixed on the bracket (1).

3. The quick hole-making tool for the closed-angle structure area of an aircraft according to claim 2, wherein, The motor base (2) is L-shaped, the brushless motor (13) is fixed on its bottom plate, and its side plate is provided with grid openings for heat dissipation.

4. A rapid hole-making tool for the closed-angle structure area of an aircraft, as claimed in claim 2, wherein A second bearing (10) is installed in the round hole on the upper surface of the bracket (1), and the connecting shaft (14) is fixed to the inner hole of the second bearing (10) to prevent the output shaft of the brushless motor (13) from shaking.

5. A rapid hole-making tool for the closed-angle structure area of an aircraft, as claimed in claim 2, wherein Another support plate is provided on the upper surface of the bracket (1), and a circular groove is made on the support plate. The two support plates are arranged oppositely, and the round holes and the circular groove on the two support plates are coaxial. The tail of the drill bit (5) is inserted into the circular groove to prevent shaking during rotation.

6. A rapid hole-making tool for an aircraft closed-angle structure area according to claim 2, characterized in that, A retaining piece (4) is fixed on the support plate of the bracket (1) where the first bearing (3) is installed, and it is located on the side far from the first steel bevel gear (7) to prevent the first bearing (3) from falling off due to vibration.

7. A rapid hole-making tool for the closed-angle structure area of an aircraft, as claimed in claim 1, wherein Inside the described control box (19), there is an electronic speed control module (21). Outside, there are a speed control knob (17), a switch (18), a motor connector (20), and a control box power connector (22); the switch (18) is used to turn the control box (19) on and off. The speed control knob (17) is connected to the electronic speed control module (21) and is used to adjust the speed of the brushless motor (13). Inside the motor connector (20), it is connected to the electronic speed control module (21), and outside, it is connected to the three-phase motor wires of the brushless motor (13) through a cable. The control box power connector (22) is connected to the power supply module (27).

8. A rapid hole-making tool for the closed-angle structure area of an aircraft, as claimed in claim 1, wherein On the described power supply module (27), there are a power output connector (23), a current adjustment knob (24), a voltage adjustment knob (25), and a display screen (26); the power output connector (23) is connected to the control box (19) through a cable. The power supply module (27) adjusts the output voltage through the voltage adjustment knob (25) and adjusts the output current through the current adjustment knob (24). The display screen (26) shows the current and voltage values.

9. A method for using a rapid hole-making tool for an aircraft closed-angle structure area according to any one of claims 1-8, characterized in that, The described usage method includes the following steps: Step 1: Apply lubricating oil on the first steel bevel gear (7) and the second steel bevel gear (8), and install the outer shell (15); Step 2: Turn on the power supply module (27), and adjust the working voltage and the upper limit current value of the circuit according to the rotational speed requirements of the structure to be drilled and the hole-making drill speed and working voltage requirements of the brushless motor (13); Step 3: Turn off the power supply module (27), and connect the power supply module (27), the control box (19), and the brushless motor (13) through cables; Step 4: Turn on the power supply module (27), and the control box (19) is powered on. When powered on, adjust the speed of the brushless motor (13) to the lowest; place the tool bit on the area of the closed-angle structure to be drilled, and adjust the speed of the brushless motor (13) to the specified speed; Step 5: Align the drill bit (5) with the hole to be drilled, and adjust the angle between the drill bit (5) and the hole to be drilled to ensure that the initial hole position and perpendicularity meet the requirements. Start hole-making. After the drilling is completed, adjust the drill speed to the lowest, and turn off the power supply module (27).

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