An aircraft suspension section numerical control milling machine hole drilling tool and processing method

Abstract

The application provides an aircraft hanging section numerical control milling machine hole processing tool and processing method, and belongs to the technical field of aircraft assembly. The bottom frame of the tool is provided with a joint intersection positioner assembly at one end and two frame intersection positioner assemblies at the other end, which are respectively used for connecting the lug holes at the two ends of the hanging section. A support seat is arranged in the middle of the bottom frame, and lateral support plate assemblies are arranged on both sides. Locking rods are arranged on the support seat and the lateral support plate assemblies, which are respectively used for fixing the hanging section from the bottom and the two sides. An upper cross beam is fixed to the upper end of the lateral support plate assembly, and a locking rod is arranged on the upper cross beam, which is used for fixing the hanging section from the top. After the hanging section is fixed on the tool, the hole position is marked manually with the edge of each surface as the reference. After the rough hole is processed, the fine hole processing is performed after checking. The application realizes rapid and continuous hole processing based on five-coordinate numerical control milling machine automatic drilling, and completes the precision hole processing of three surfaces at one time. The efficiency is improved, and the part precision and the automation degree are increased.

Description

Technical Field

[0001] This invention belongs to the field of aircraft assembly technology, and relates to a CNC milling tooling and machining method for aircraft suspension sections. Background Technology

[0002] Rapid assembly technology represents the development direction of aircraft assembly coordination technology, and is of great significance to the civil aviation manufacturing industry in improving manufacturing efficiency, increasing aircraft assembly accuracy and success rate, shortening development cycle and reducing production costs.

[0003] The sling is used to connect the aircraft engine to the wing and is the main force transmission structure of the engine, transferring the engine's thrust to the aircraft. Located under the wing, its main structure consists of upper, lower, left, and right side panels and a frame, all made of titanium alloy. Traditional assembly drilling uses manual or automatic feed drilling for guided holes. After positioning and installing the assembly tooling using numerous positioners, manual or automatic feed drilling is performed to enlarge the holes. This method is labor-intensive, has low processing and assembly efficiency, and high tooling costs. It is difficult to increase the assembly rate during the production phase and cannot meet my country's goals of rapid, intelligent, and innovative development. Summary of the Invention

[0004] This invention provides a CNC milling tooling and machining method for drilling holes in aircraft sling sections, which solves the problems of high labor intensity, low processing efficiency, low assembly efficiency, high tooling cost, and difficulty in increasing assembly speed during the production phase when manually drilling holes for such aircraft sling assemblies. It greatly improves processing efficiency while taking into account the advantages of high precision and high automation manufacturing, and can also provide rich experience for the application of advanced rapid assembly technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A CNC milling tooling for drilling holes in an aircraft sling section, the CNC milling tooling comprising a bottom frame 2, a joint intersection locator assembly 3, a left frame intersection locator assembly 4, a right frame intersection locator assembly 5, an upper crossbeam 6, a side support plate assembly 7, a counterweight block 8, a locking rod 9, and a support base.

[0007] The bottom frame 2 serves as the installation base for the entire tooling. Multiple counterweights 8 are detachably installed at one end of the bottom frame 2 to balance the center of gravity. Tool balls are set at the four corners of the upper surface of the bottom frame 2 for CNC milling machine reference alignment and tooling verification. Lifting rings are installed on the bottom frame 2 for tooling transfer.

[0008] The connector intersection locator assembly 3 is fixedly installed in the middle of the end of the bottom frame 2 where the counterweight 8 is installed, for connecting with the lug connector at one end of the hanging section 1. It includes an intersection locating shaft 10, a pad 11, a base 12, and a support 13. The base 12 and the support 13 constitute the main body. The base 12 is fixedly connected to the bottom frame 2. The upper end of the support 13 has a hole and is fixed to the hanging section 1 through the intersection locating shaft 10. The top of the support 13 is provided with a pad 11, which is inserted between the two lugs of the corresponding lug connector of the hanging section 1. The support 13 is provided with a tool ball for positioning the connector intersection locator assembly 3 on the bottom frame 2 to adapt to different sizes of hanging sections 1.

[0009] The left and right frames of the frame intersection locator assembly are identical in structure, both including an intersection positioning shaft 10, a clamp 14, a positioning plate 15, and a bracket 16. The bracket 16 is fixedly connected to the two side frames at the other end of the bottom frame 2, and has multiple connection holes of different heights. The positioning plate 15 also has connection holes, and is fixedly connected by the clamp 14 engaging with the connection holes on the bracket 16. The upper end of the positioning plate 15 has a through hole, which is fixed to the lugs on both sides of the other end of the hanging section 1 by the intersection positioning shaft 10. The positioning plate 15 is equipped with a tool ball for positioning the left and right frames of the frame intersection locator assembly on the bottom frame 2. By adjusting the connection holes of different heights on the positioning plate 15 and the bracket 16, it can be adapted to hanging sections 1 of different lengths and heights.

[0010] Multiple support bases are provided and fixedly connected to the bottom frame 2 along the length direction. Each support base is provided with a locking rod 9 arranged in the vertical direction to support the bottom plane and inclined plane of the hanging section 1 from below.

[0011] The lateral support plate assembly 7 consists of 6 sets, which are symmetrically installed on the frames on both sides of the bottom frame 2 along its length. Each lateral support plate assembly 7 is provided with a locking rod 9 arranged in the horizontal direction on its upper part, and its tail end abuts against the side wall of the hanging section 1 for fixing the hanging section 1 from both sides.

[0012] The upper crossbeam 6 is fixed at both ends to the top of two side support plate assemblies 7 located in the middle of the bottom frame 2. Two locking rods 9 are arranged vertically on the upper crossbeam 6, and their tail ends abut against the top outer wall of the hanging section 1 for fixing the hanging section 1 from the vertical direction.

[0013] This invention also provides a method for machining holes in an aircraft suspension section using a CNC milling machine, which is implemented in conjunction with the aforementioned CNC milling machine tooling and an existing five-axis CNC milling machine and drill bit. The CNC milling machine hole machining method includes the following steps:

[0014] Step 1: Using the ear holes at both ends of the hanging section 1 (excluding the mounting points of the intersection locators) as the lifting points, suspend the hanging section 1 above the CNC milling machine's hole-making fixture.

[0015] Step 2: Use the intersection positioning shaft 10 to install the rear end of the hanging section 1 onto the joint intersection positioning device assembly 3, and then use the intersection positioning shaft 10 to install the front end of the hanging section 1 onto the left 4 and right 5 of the frame intersection positioning device assembly.

[0016] Step 3: After tightening the locking rods 9 on both sides, install the upper crossbeam 6 and tighten the locking rods 9 on the upper crossbeam 6.

[0017] Step 4: Using the edge of each side of the hanging section 1 as a reference, mark the holes to be processed with a cross mark using a scribing pen by hand.

[0018] Step 5: Use the tool ball on the bottom frame 2 to perform CNC milling reference alignment and rough hole making.

[0019] Step 6: Hole making is done using a two-drill method. After making the rough hole, it is aligned with the crosshair and finally the fine hole is completed.

[0020] The beneficial effects of this invention are as follows: This invention adopts a CNC milling tooling and machining method for aircraft suspension sections. Based on the automatic drilling of a five-axis CNC milling machine, CNC machining is performed through the tooling, realizing fast and continuous hole machining. Precision hole machining of three sides can be completed in one clamping, improving efficiency while increasing the precision of parts and the degree of automation. Attached Figure Description

[0021] Figure 1 This is an isometric view of the CNC milling machine hole-making fixture of the present invention.

[0022] Figure 2 This is a diagram of the connector intersection locator assembly.

[0023] Figure 3 This is a diagram of the frame intersection locator component.

[0024] In the diagram: 1. Hanging section; 2. Bottom frame; 3. Joint intersection locator assembly; 4. Left frame intersection locator assembly; 5. Right frame intersection locator assembly; 6. Upper crossbeam; 7. Side support plate assembly; 8. Counterweight; 9. Locking rod; 10. Intersection positioning shaft; 11. Pad; 12. Base; 13. Support; 14. Clamp; 15. Positioning plate; 16. Bracket. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments derived by those skilled in the art based on the embodiments of the present invention through modifications or adjustments are within the protection scope of the present invention.

[0026] This embodiment provides a CNC milling fixture for drilling holes in an aircraft sling section. The CNC milling fixture includes a bottom frame 2, a joint intersection locator assembly 3, a left frame intersection locator assembly 4, a right frame intersection locator assembly 5, an upper crossbeam 6, a side support plate assembly 7, a counterweight 8, a locking rod 9, and a support base. Figure 1 As shown.

[0027] The bottom frame 2 serves as the installation foundation for the entire tooling. It is constructed by welding two horizontal square tubes and seven vertical square tubes, each 120mm long. Ten counterweights 8 are detachably installed at one end to balance the center of gravity. Each counterweight 8 is 20mm thick and is connected to the bottom frame 2 by bolts. Six 180mm×150mm flat bases, each 20mm thick, are symmetrically installed on the two horizontal square tubes of the bottom frame 2 to fix the lateral support plate assembly 7 and ensure the stability of the frame. Tool balls with a diameter of 40mm are set at the four corners of the upper surface of the bottom frame 2 for CNC milling machine reference alignment and tooling verification. Lifting rings are installed on the outside of the horizontal square tubes of the bottom frame 2 by bolts for tooling transfer.

[0028] like Figure 2 As shown, the connector intersection locator assembly 3 is fixedly installed in the middle of the end of the bottom frame 2 where the counterweight 8 is installed, for connecting with the lug connector at one end of the hanging section 1. It includes an intersection locating shaft 10, a pad 11, a base 12, and a support 13. The base 12 and the support 13 are an integral structure, forming the main body. The base 12 is fixedly connected to the bottom frame 2 by a cylindrical pin and screws. The upper end of the support 13 has a hole, which is fixed to the hanging section 1 by the intersection locating shaft 10. The top of the support 13 is provided with a pad 11, which is inserted between the two lugs of the corresponding lug connector of the hanging section 1. The support 13 is provided with a tool ball for positioning the connector intersection locator assembly 3 on the bottom frame 2 to adapt to different sizes of hanging sections 1.

[0029] like Figure 3As shown, the left 4 and right 5 of the frame intersection locator assembly have the same structure, both including an intersection positioning shaft 10, a clamp 14, a positioning plate 15, and a bracket 16. The bracket 16 is fixedly connected to the two side frames at the other end of the bottom frame 2, and has multiple connection holes of different heights. Each of the two positioning plates 15 has two connection holes, and they are fixedly connected by two clamps 14 engaging with the corresponding connection holes on the bracket 16. The upper end of the positioning plate 15 has a through hole, which is fixed to the lugs on both sides of the other end of the hanging section 1 by the intersection positioning shaft 10. The positioning plate 15 is provided with a tool ball for positioning the left 4 and right 5 of the frame intersection locator assembly on the bottom frame 2. By adjusting the connection holes of different heights on the positioning plate 15 and the bracket 16, it can be adapted to hanging sections 1 of different lengths and heights.

[0030] Three support seats are provided and fixedly connected to the bottom frame 2 along the length direction. Each support seat is provided with a locking rod 9 arranged in the vertical direction to support the bottom plane and the inclined plane of the hanging section 1 from below. The support seats near the left 4 and right 5 of the frame intersection locator assembly are higher than the other two and are used to support the inclined plane of the hanging section 1.

[0031] The lateral support plate assembly 7 comprises 6 sets, which are respectively bolted to 6 flat bases on the bottom frame 2. Each lateral support plate assembly 7 has a horizontally threaded hole on its upper part, and a locking rod 9 is threaded into the hole. The tail end of the locking rod abuts against the side wall of the hanging section 1 for fixing the hanging section 1 from both sides. The lateral support plate assembly 7 located in the middle is made of a 60mm wide square tube to increase stability and rigidity, while the lateral support plate assemblies 7 located on both sides are 100mm wide and 20mm thick.

[0032] The upper crossbeam 6 is fixed at both ends to the top of two side support plate assemblies 7 located in the middle of the bottom frame 2. The upper crossbeam 6 is provided with two threaded holes arranged in the vertical direction. Locking rods 9 are threaded in the holes and their tail ends abut against the top outer wall of the hanging section 1 for fixing the hanging section 1 from the vertical direction.

[0033] The tool ball on the CNC milling machine hole-making fixture is used in conjunction with a laser tracker for measurement to ensure that the fixture tolerance is ±0.12mm.

[0034] The tooling material for the CNC milling machine hole making is steel.

[0035] When manufacturing the CNC milling machine hole-making fixture, stress relief treatment is required after welding.

[0036] This invention also provides a method for machining holes in an aircraft suspension section using a CNC milling machine, which is implemented in conjunction with the aforementioned CNC milling machine tooling and an existing five-axis CNC milling machine and drill bit. The CNC milling machine hole machining method includes the following steps:

[0037] Step 1: Using the ear holes at both ends of the hanging section 1 (excluding the mounting points of the intersection locators) as the lifting points, suspend the hanging section 1 above the CNC milling machine's hole-making fixture.

[0038] Step 2: Use the intersection positioning shaft 10 to install the rear end of the hanging section 1 onto the joint intersection positioning device assembly 3, and then use the intersection positioning shaft 10 to install the front end of the hanging section 1 onto the left 4 and right 5 of the frame intersection positioning device assembly.

[0039] Step 3: After tightening the locking rods 9 on both sides, install the upper crossbeam 6 and tighten the locking rods 9 on the upper crossbeam 6.

[0040] Step 4: Using the edge of each side of the hanging section 1 as a reference, mark the holes to be processed with a cross mark using a scribing pen by hand.

[0041] Step 5: Use the tool ball on the bottom frame 2 to perform CNC milling reference alignment and complete the rough hole making on three sides of the hanging section 1.

[0042] Step 6: Hole making is carried out using a two-drill method. After making the rough hole, the overlap with the crosshair is calibrated to ensure the hole accuracy. The fine hole is then completed. After machining, residual burrs are removed manually, the external dimensions are checked, and the hole is delivered.

[0043] The above-described embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. An aircraft pylon section numerically controlled miller hole drilling tooling, characterized in that, The numerical control milling machine hole making tool includes a bottom frame (2), a joint intersection locator assembly (3), a frame intersection locator assembly left (4), a frame intersection locator assembly right (5), an upper cross beam (6), a lateral support plate assembly (7), locking rods (9) and support seats; The bottom frame (2) is fixedly connected with the joint intersection locator assembly (3) at the middle of one end, and is fixedly connected with the frame intersection locator assembly left (4) and the frame intersection locator assembly right (5) at the two sides of the other end; the three locator assemblies are respectively used for fixing the ear joint at the two ends of the hanging section (1); a plurality of support seats are arranged along the length direction of the bottom frame (2), and the locking rods (9) arranged in the vertical direction are arranged on each support seat and used for supporting the bottom plane and the inclined plane of the hanging section (1) from below; the lateral support plate assembly (7) is provided with six groups, and is symmetrically mounted on the frames at the two sides of the length direction of the bottom frame (2); the locking rods (9) arranged in the horizontal direction are arranged on the upper part of each lateral support plate assembly (7) and used for fixing the hanging section (1) from the two sides; the upper cross beam (6) is fixed at the top ends of the two lateral support plate assemblies (7) located at the middle of the bottom frame (2), and the locking rods (9) arranged in the vertical direction are arranged on the upper cross beam (6) and used for fixing the hanging section (1) from the vertical direction; The joint intersection locator assembly (3) includes an intersection locating shaft (10), a backing plate (11), a base (12) and a support (13); the base (12) and the support (13) form a main body; the base (12) is fixedly connected to the bottom frame (2); the support (13) is provided with a hole at the upper end and is fixed to the hanging section (1) through the intersection locating shaft (10); the backing plate (11) is arranged on the top of the support (13) and is inserted between the two ears of the corresponding ear joint of the hanging section (1); The frame intersection locator assembly left (4) and the frame intersection locator assembly right (5) are the same in structure and both include an intersection locating shaft (10), a clamp (14), a locating plate (15) and a bracket (16); the bracket (16) is fixedly connected to the bottom frame (2) and is provided with a connecting hole; the locating plate (15) is also provided with a connecting hole, and the clamp (14) is matched with the connecting hole of the bracket (16) to realize fixed connection; the locating plate (15) is provided with a through hole at the upper end and is fixed to the ear of the hanging section (1) through the intersection locating shaft (10).

2. The numerically controlled milling machine for making holes of a hanging section of an aircraft according to claim 1, characterized in that, The bracket (16) is provided with a plurality of connecting holes with different heights, and the locating plate (15) is matched with the connecting holes with different heights of the bracket (16) to adapt to the hanging section (1) with different heights.

3. The numerically controlled milling machine for making holes in a section of a suspension of an aircraft according to claim 1, characterized in that, Tool balls are arranged at the four corners of the upper surface of the bottom frame (2) and are used for numerical control milling machine datum alignment and tool calibration.

4. The numerically controlled milling machine for making holes of a hanging section of an aircraft according to claim 1, characterized in that, A plurality of counterweights (8) are detachably mounted at one end of the bottom frame (2) close to the joint intersection locator assembly (3) and are used for balancing the gravity center.

5. The numerically controlled milling machine for drilling holes in a section of a suspension of an aircraft according to claim 1, characterized in that, The joint intersection locator assembly (3), the frame intersection locator assembly left (4) and the frame intersection locator assembly right (5) are provided with tool balls, which are used for positioning the three on the bottom frame (2) to adapt to different sizes of hanging sections (1).

6. An aircraft hanging section numerical control milling machine hole processing method is realized based on the numerical control milling machine hole processing tooling of any one of claims 1-5, and the numerical control milling machine hole processing method comprises the following steps: Step 1, through the ear hole of the non-installed intersection locator at both ends of the hanging section (1), the hanging section (1) is suspended above the numerical control milling machine hole processing tooling; Step 2, the rear end of the hanging section (1) is installed on the joint intersection locator assembly (3), and the front end of the hanging section (1) is installed on the frame intersection locator assembly left (4) and the frame intersection locator assembly right (5); Step 3, after tightening the locking rods (9) on both sides, the upper cross beam (6) is installed, and the locking rods (9) on the upper cross beam (6) are tightened; Step 4, taking the edge of each side of the hanging section (1) as a reference, mark the holes to be processed; Step 5, the numerical control milling machine hole processing tooling is aligned and rough holes are processed; Step 6, after the rough holes are processed, the marking in step 4 is calibrated, and finally the fine hole processing is completed.

Images