Flexible Tool Testing Part Assembly for Finish Machining of Aircraft Laminated Intersection Holes

Abstract

The flexible tool trial assembly for finish machining of aircraft laminated intersection holes belongs to the field of aircraft assembly manufacturing. By combining and assembling different special structure tool trial pieces, the finish machining working conditions of laminated intersection holes with three or more layers are accurately simulated. By changing parameters such as the thickness and initial hole diameter of the tool trial pieces, the finish machining working conditions of laminated intersection holes with different sizes can be simulated. Through the above method, only one fixture can be used to complete the finish machining tool trial work under different front and rear guide distances of tools and different sizes of tool trial pieces, accurately simulating the finish machining working conditions of different intersection holes. The tool trial pieces with special structures are assembled and installed on the flexible tool trial fixture, accurately simulating the finish machining working conditions of laminated intersection holes, realizing flexible tool trial at the same time, reducing the tool trial cost and improving the tool trial efficiency.

Description

Technical Field

[0001] The present invention relates to the field of aircraft assembly and manufacturing, and particularly to a flexible tool trial assembly for finish machining of laminated intersection holes of an aircraft. Background Art

[0002] Before the installation and debugging of the wing-related components of a certain type of aircraft, it is necessary to perform finish reaming on the lug intersection holes. The accuracy of the intersection holes plays a particularly crucial role in the smooth installation and debugging of the wing-related components. Therefore, the design department has put forward high requirements for technical indicators such as the coaxiality of the intersection holes, the hole wall tolerance, and the minimum wall thickness. The finish machining of the intersection holes is difficult, and the risk of product rejection due to out-of-tolerance is relatively high.

[0003] Before the finish machining of the product, it is necessary to simulate the machining conditions of the product and conduct a finish tool trial. In order to find a suitable processing method, achieve the required machining accuracy, and reduce the product rejection rate and improve the aircraft assembly efficiency.

[0004] Due to the particularity of the structure of a certain type of aircraft, there are a large number of finish machining conditions for multi-layer laminated intersection holes, and the thickness and material of the intersection holes are different. When conducting a finish tool trial, if the traditional finish tool trial method is adopted, it is impossible to accurately simulate the finish machining conditions of laminated intersection holes with more than two layers, and multiple sets of tool trial fixtures are required. The tool trial cost is relatively high, the labor time is long, the intensity is high, and the work efficiency is low. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a flexible tool trial assembly for finish machining of laminated intersection holes of an aircraft, and a flexible tool trial method for finish machining of laminated intersection holes of an aircraft. By combining and assembling different special structure tool trial pieces, the finish machining conditions of laminated intersection holes with three or more layers are accurately simulated. By changing parameters such as the thickness and initial hole diameter of the tool trial pieces, the finish machining conditions of laminated intersection holes with different sizes can be simulated. The assembled tool trial pieces are fastened to the flexible tool trial fixture with bolts. The positions of the front guide bracket, rear guide bracket, and tool trial piece bracket of the fixture are adjusted with a track and clamped and fixed. At the same time, according to the tool trial conditions, drill sleeves with different sizes are configured on the front and rear guide brackets. Through the above method, the finish tool trial work under different front and rear guide distances of different tools and different tool trial piece sizes can be completed only through one fixture, accurately simulating different finish machining conditions of intersection holes. Assembling and combining tool trial pieces with special structures and installing them on the flexible tool trial fixture accurately simulate the finish machining conditions of laminated intersection holes, and at the same time realize flexible tool trial, reduce the tool trial cost, and improve the tool trial efficiency.

[0006] The present invention adopts the following technical solutions:

[0007] Flexible tool testing piece assembly for finish machining of aircraft laminated intersection holes, characterized in that the flexible tool testing piece assembly for finish machining of aircraft laminated intersection holes includes a leading direction tool testing piece 1, a middle tool testing piece 2 and a trailing direction tool testing piece 3.

[0008] The leading direction tool testing piece 1 includes a middle tool testing piece support boss 1-1, a material to be machined A 1-2, a tool testing piece support bushing mating A 1-3, a tool testing piece support connecting flange A 1-4, bolt holes A 1-5 and a primary hole A 1-6; the middle tool testing piece support boss 1-1 is used to fix the mating middle tool testing piece 2 to prevent axial movement of the middle tool testing piece 2. The material to be machined A 1-2 is used to simulate the laminated condition of the intersection holes. The tool testing piece support bushing mating A 1-3 is used for positioning and mating of the tool testing piece with the tool testing piece support of the tool testing fixture; the tool testing piece support connecting flange A 1-4 is used to connect the tool testing piece with the tool testing piece support of the tool testing fixture, and bolt holes are provided on the tool testing piece support connecting flange A 1-4. When installing the leading direction tool testing piece 1, the surface of the tool testing piece support connecting flange A 1-4 is fitted with the surface of the tool testing piece support of the tool testing fixture, and at the same time, the bolt holes of the tool testing piece support connecting flange A 1-4 are aligned and coincided with the bolt holes of the tool testing piece support of the tool testing fixture, and bolts are installed and tightened to fasten the tool testing piece support connecting flange A 1-4 to the tool testing piece support of the tool testing fixture, realizing the connection of the tool testing piece with the tool testing piece support of the tool testing fixture. The primary hole A 1-6 is used to simulate the finish machining condition of the intersection holes.

[0009] The middle tool testing piece 2 includes a material to be machined B 2-1, an outer circle 2-2, a limiting plane A 2-3, an upper surface 2-4, a lower surface 2-5, and a primary hole B 2-6. The material to be machined B 2-1 is used to simulate the laminated condition of the intersection holes. The outer circle 2-2 is in contact and mating with the middle tool testing piece fixing bushing 3-4 of the trailing direction tool testing piece 3. The limiting plane A 2-3 is in contact and mating with the limiting plane B 3-6 of the trailing direction tool testing piece 3 to prevent the middle tool testing piece 2 from rotating during tool testing. The upper surface 2-4 is in contact and mating with the surface of the trailing direction tool testing piece 3, and the lower surface 2-5 is in contact and mating with the surface of the leading direction tool testing piece 1 to play a role of fixing and limiting. The primary hole B 2-6 is used to simulate the finish machining condition of the intersection holes.

[0010] The rear guiding direction tool testing piece 3 includes a tool testing piece support connecting flange B3-1, bolt holes B3-2, primary holes C3-3, a middle tool testing piece fixing bushing 3-4, a material to be processed C3-5, a limiting plane B3-6, and a tool testing piece support mating bushing B3-7; the tool testing piece support connecting flange B3-1 is used to connect the tool testing piece to the tool testing piece support of the tool testing fixture, and bolt holes are provided on the tool testing piece support connecting flange B3-1. When installing the rear guiding direction tool testing piece 3, the surface of the tool testing piece support connecting flange B3-1 is fitted with the surface of the tool testing piece support of the tool testing fixture. At the same time, the bolt holes of the tool testing piece support connecting flange B3-1 are aligned and overlapped with the bolt holes of the tool testing piece support of the tool testing fixture, and bolts are installed and tightened to fasten the tool testing piece support connecting flange B3-1 to the tool testing piece support of the tool testing fixture, realizing the connection between the tool testing piece and the tool testing piece support of the tool testing fixture. The material to be processed C3-5 is used to simulate the intersection hole lamination working condition, the primary holes C3-3 are used to simulate the finish machining working condition of the intersection holes, and the middle tool testing piece fixing bushing 3-4 is used to fix the middle tool testing piece 2. The inner diameter of the middle tool testing piece fixing bushing 3-4 is in contact with the outer circle of the middle tool testing piece 2-2 and the support boss 1-1 of the middle tool testing piece. The end face of the middle tool testing piece fixing bushing 3-4 is in contact with the tool testing piece support connecting flange A1-4 to play a role in fixing and positioning. The limiting plane B3-6 of the rear guiding direction tool testing piece 3 is in contact and cooperation with the limiting plane A2-3 of the middle tool testing piece 2 to prevent the middle tool testing piece 2 from rotating during the tool testing process. The function of the tool testing piece support mating bushing B3-7 is to be in positioning cooperation with the tool testing piece support of the tool testing fixture.

[0011] Further, when it is necessary to simulate the finish machining working condition of intersection hole lamination with more than three layers, two or more tool testing pieces with the same structure can be axially overlapped and placed with the middle tool testing piece 2 changed.

[0012] The beneficial effects brought by the present invention are as follows:

[0013] 1. By combining and assembling different special structure tool testing pieces, the finish machining working condition of intersection holes with three or more layers of lamination is accurately simulated. At the same time, by changing parameters such as the thickness of the tool testing piece and the diameter of the primary hole, the finish machining working condition of intersection holes with different sizes can be simulated.

[0014] 2. Only one flexible tool testing fixture is used. By adjusting the position of the support and replacing drill sleeves with different sizes, the simulation of the finish machining working condition under different front and rear guiding distances of different tools and different intersection hole sizes is realized, that is, flexible tool testing is realized. The manufacturing cost of the tooling is reduced, and the tool testing efficiency is improved. Description of the Drawings

[0015] Figure 1 It is a three-dimensional explosion diagram of the tool testing piece assembly.

[0016] Figure 2 It is a two-dimensional assembly state diagram of the tool testing piece assembly.

[0017] Figure 3 It is a two-dimensional schematic diagram of the tool test piece in the leading direction. (a) is the front view, and (b) is the side view.

[0018] Figure 4 It is a two-dimensional schematic diagram of the tool test piece in the middle part. (a) is the front view, and (b) is the side view.

[0019] Figure 5 It is a two-dimensional schematic diagram of the tool test piece in the trailing direction. (a) is the front view, and (b) is the side view.

[0020] Figure 6 It is a three-dimensional view of the overall structure of the flexible tool test fixture for finish machining of the intersection hole.

[0021] Figure 7 It is the front view of the overall structure of the flexible tool test fixture for finish machining of the intersection hole.

[0022] In the figure: 1 Tool test piece in the leading direction, 1-1 Support boss of the tool test piece in the middle part, 1-2 Workpiece material A to be machined, 1-3 Matching bushing A of the tool test piece support, 1-4 Connecting flange A of the tool test piece support, 1-5 Bolt hole A, 1-6 Primary hole A, 2 Tool test piece in the middle part, 2-1 Workpiece material B to be machined, 2-2 Outer circle, 2-3 Limiting plane A, 2-4 Upper surface, 2-5 Lower surface, 2-6 Primary hole B, 3 Tool test piece in the trailing direction, 3-1 Connecting flange B of the tool test piece support, 3-2 Bolt hole B, 3-3 Primary hole C, 3-4 Fixed bushing of the tool test piece in the middle part, 3-5 Workpiece material C to be machined, 3-6 Limiting plane B, 3-7 Matching bushing B of the tool test piece support, 4 Base, 5 Pillar, 6 Upper cross beam, 7 Upper track, 8 Lower track, 9 Tool holder and trailing support, 10 Trailing and tool test piece support, 11 Leading and tool test piece support, 12 Rear trailing drill bushing, 13 Front trailing drill bushing, 14 Leading drill bushing, 15 Support clamp, 16 Limiting post. Specific implementation mode

[0023] Taking the three-layer laminated intersection hole finish machining simulation tool test piece as an example, the tool test piece assembly is mainly composed of the tool test piece 1 in the leading direction, the tool test piece 2 in the middle part, and the tool test piece 3 in the trailing direction.

[0024] Among them, the tool test piece 1 in the leading direction is composed of the support boss 1-1 of the tool test piece in the middle part, the workpiece material A1-2 to be machined, the matching bushing A1-3 of the tool test piece support, the connecting flange A1-4 of the tool test piece support, the bolt hole A1-5, and the primary hole A1-6.

[0025] The support boss 1-1 of the tool test piece in the middle part is set to fix the tool test piece in the middle part that cooperates with it and prevent its axial movement. To effectively fix the tool test piece in the middle part, the height of the boss is 2-3 mm.

[0026] The material to be processed A1-2 is the core component of the leading-direction tool test piece 1, and its function is to simulate the working condition of the intersection hole laminate. The thickness of the material to be processed A1-2 is 12 - 20 mm.

[0027] The tool test piece bracket mating bushing A1-3 is provided for the positioning and mating of the tool test piece and the tool test fixture's tool test piece bracket. To ensure the effective positioning and mating of the tool test piece and the flexible tool test fixture, the length of the bushing is 10 - 12 mm, and the outer diameter of the bushing is 40 mm.

[0028] The tool test piece bracket connecting flange A1-4 is provided to connect the tool test piece and the tool test fixture's tool test piece bracket. Bolt holes are provided on the flange. When installing the leading-direction tool test piece, the surface of the flange is fitted with the surface of the tool test piece bracket, and at the same time, the flange bolt holes are aligned and coincided with the tool test piece bracket bolt holes. After installing and tightening the bolts, the flange is fastened to the tool test piece bracket to achieve the connection between the tool test piece and the tool test piece bracket. To fully accommodate the bolt head and facilitate bolt installation, the diameter of the flange is 80 - 100 mm, and the thickness of the flange is 4 - 6 mm.

[0029] The bolt hole A1-5 is provided to connect the tool test piece and the tool test fixture's tool test piece bracket. The diameter of the bolt hole is 4 - 6 mm.

[0030] The preliminary hole A1-6 is provided to simulate the finish machining working condition of the intersection hole. To accurately simulate the finish machining working condition, the diameter of the preliminary hole is 10 - 14 mm.

[0031] The middle tool test piece 2 consists of the material to be processed B2-1, the outer circle 2-2, the limiting plane A2-3, the upper surface 2-4, the lower surface 2-5, and the preliminary hole B2-6.

[0032] The material to be processed B2-1 is the core component of the middle tool test piece 2, and its function is to simulate the working condition of the intersection hole laminate. The thickness of the material to be processed B2-1 is 12 - 20 mm.

[0033] The outer circle 2-2 is provided to fix the middle tool test piece 2. The outer circle 2-2 is in contact and mating with the relevant part of the trailing-direction tool test piece 3. The outer diameter of the outer circle is 30 - 35 mm.

[0034] The limiting plane A2-3 is in contact and mating with the limiting plane of the trailing-direction tool test piece 3 to prevent the middle tool test piece 2 from rotating during the tool test. The length of the limiting plane is 12 - 20 mm.

[0035] The upper surface 2-4 is in contact and mating with the surface of the trailing-direction tool test piece 3, and the lower surface 2-5 is in contact and mating with the surface of the leading-direction tool test piece 1 to play a role in fixing and limiting.

[0036] The preliminary hole B2-6 is provided to simulate the finish machining working condition of the intersection hole. To accurately simulate the finish machining working condition, the diameter of the preliminary hole is 10 - 14 mm.

[0037] If simulating the finish machining condition of intersection holes with more than three layers, more than two identical-structured tool testing parts can be axially overlapped and placed with the middle tool testing part 2 changed.

[0038] The rear guiding direction tool testing part 3 is composed of a tool testing part support connecting flange B3-1, a bolt hole B3-2, a primary hole C3-3, a middle tool testing part fixing bushing 3-4, a material to be machined C3-5, a limiting plane B3-6, and a tool testing part support mating bushing B3-7.

[0039] The tool testing part support connecting flange B3-1 is provided for connecting the tool testing part with the tool testing fixture's tool testing part support. Bolt holes are provided on the flange. When installing the rear guiding direction tool testing part, the flange surface is fitted with the surface of the tool testing fixture's tool testing part support. At the same time, the flange bolt holes are aligned and coincided with the bolt holes of the tool testing part support. Bolts are installed and tightened to fasten the flange to the tool testing part support, realizing the connection between the tool testing part and the tool testing part support. To fully place the bolt head and facilitate bolt installation, the flange diameter is 80-100 mm, and the flange thickness is 4-6 mm.

[0040] The material to be machined C3-5 is the core component of the rear guiding direction tool testing part 3, and its function is to simulate the intersection hole laminated condition. The thickness of the material to be machined C3-5 is 12-20 mm.

[0041] The primary hole C3-3 is provided for simulating the finish machining condition of the intersection hole. To accurately simulate the finish machining condition, the primary hole diameter is 10-14 mm.

[0042] The middle tool testing part fixing bushing 3-4 is provided for fixing the middle tool testing part 2. The inner diameter of the bushing contacts the outer circle 2-2 of the middle tool testing part and the support boss 1-1 of the middle tool testing part. The end face of the bushing contacts the tool testing part support connecting flange A1-4 to play a role in fixing and positioning. The outer diameter of the bushing is 40-50 mm, the inner diameter is 30-35 mm, and the bushing length is 20-40 mm.

[0043] The material to be machined C3-5 is the core component of the rear guiding direction tool testing part 3, and its function is to simulate the intersection hole laminated condition. The thickness of the material to be machined C3-5 is 12-20 mm.

[0044] The limiting plane B3-6 contacts and cooperates with the limiting plane A2-3 of the middle tool testing part 2 to prevent the middle tool testing part 2 from rotating during the tool testing process. The length of the limiting plane is 12-20 mm.

[0045] The tool testing part support mating bushing B3-7 functions to position and cooperate with the tool testing fixture's tool testing part support. To effectively position and cooperate with the fixture, the bushing length is 10-12 mm, and the outer diameter of the bushing is 40 mm.

[0046] The installation and assembly method of the above tool testing part is as follows:

[0047] 1. Check and receive the tool testing piece

[0048] Receive the tool testing piece to be installed, check whether the tool testing piece is complete, measure the relevant dimensions of the tool testing piece with a vernier caliper, and compare it with the digital mock-up of the tool testing piece to verify whether the received tool testing piece is correct.

[0049] 2. Install the tool testing piece in the forward guiding direction:

[0050] Put the mating bushing A1-3 of the tool testing piece support into the round hole of the tool testing piece support near the forward guide, ensuring effective contact and fit between the mating bushing A1-3 of the tool testing piece support and the round hole of the support.

[0051] Rotate the tool testing piece 1 in the forward guiding direction along the axis, align the bolt hole A1-5 on the connecting flange A1-4 of the tool testing piece support with the bolt hole of the tool testing piece support near the forward guide, install and tighten the bolts to complete the installation of the tool testing piece 1 in the forward guiding direction.

[0052] 3. Install the tool testing piece in the rearward guiding direction:

[0053] Put the mating bushing B3-7 of the tool testing piece support into the round hole of the tool testing piece support near the rearward guide, ensuring effective contact and fit between the bushing and the round hole of the support.

[0054] Rotate the tool testing piece 3 in the rearward guiding direction along the axis, align the bolt hole B3-2 on the connecting flange B3-1 of the tool testing piece support with the bolt hole of the tool testing piece support near the rearward guide, install and tighten the bolts to complete the installation of the tool testing piece 2 in the rearward guiding direction.

[0055] 4. Install the middle tool testing piece

[0056] Place the middle tool testing piece in the fixed bushing 3-4 of the middle tool testing piece of the tool testing piece 3 in the rearward guiding direction, ensuring that the limiting plane A2-3 of the middle tool testing piece 2 is in fit with the limiting plane B3-6 of the tool testing piece 3 in the rearward guiding direction. Complete the installation of the tool testing piece.

[0057] 5. Move the tool testing piece support

[0058] Loosen the support clamp, move the tool testing piece support so that the end face of the fixed bushing of the middle tool testing piece of the tool testing piece in the rearward guiding direction is in contact and fit with the connecting flange of the tool testing piece support of the tool testing piece in the forward guiding direction.

[0059] 6. Check the installation of the tool testing piece

[0060] Visually check whether the bolt connection is firm, whether the position of the tool testing piece is correct, and whether the support clamp is tightened. After checking and finding no errors, complete the installation of the tool testing piece.

[0061] The flexible tool testing fixture mainly consists of a base 4, a support column 5, an upper cross beam 6, an upper rail 7, a lower rail 8, a tool holder and a rear guide support 9, a rear guide and tool testing part support 10, a front guide and tool testing part support 11, a rear rear guide drill bushing 12, a front rear guide drill bushing 13, a front guide drill bushing 14, a support clamp 15, a limit post 16, etc.

[0062] The base 4, the support column 5 and the upper cross beam 6 are the main support structures of the fixture.

[0063] The upper rail 7 and the lower rail 8 are provided to enable the movement of the tool holder and rear guide support 9, the rear guide and tool testing part support 10, and the front guide and tool testing part support 8.

[0064] The rear round hole of the tool holder and rear guide support 9 is used to fix an automatic feed drill or a high-power pneumatic drill, and the front round hole is used to fix the rear guide drill bushing of the tool. The distance between the rear round hole and the front round hole is 462 mm, so as to have enough space to place the high-power pneumatic drill and accurately simulate a specific finish machining condition.

[0065] The rear round hole of the rear guide and tool testing part support 10 has a diameter of 40 mm and is used to install the rear guide drill bushing of the tool. The front round hole also has a diameter of 40 mm and is used to install the tool testing part. To accurately simulate the finish machining condition, the distance between the front round hole and the rear round hole is 20 mm.

[0066] The rear round hole of the front guide and tool testing part support 11 has a diameter of 40 mm and is used to install the tool testing part, and the front round hole also has a diameter of 40 mm. To accurately simulate a specific finish machining condition, the distance between the front round hole and the rear round hole is 20 mm.

[0067] The inner holes of the rear rear guide drill bushing 12 and the front rear guide drill bushing 13 are used to fix the rear guide of the finish machining tool, and the outer circles are used to fix to the support. The rear rear guide drill bushing 12 has nine different size series with inner diameters of Φ14H11, Φ14.5H11, Φ15H11, Φ15.5H11, Φ15.7H9, Φ15.8H9, Φ15.9H9, Φ15.95H8, Φ16H8 and an outer diameter of Φ40. The front rear guide drill bushing 13 has two different size series with inner diameters of Φ16H7, Φ18H7 and an outer diameter of Φ40 to adapt to finish machining tools with different rear guide diameters. All drill bushings are connected to the support with fasteners.

[0068] The inner diameter of the front guide drill bushing 14 is used to fix the front guide of the finish machining tool, and the outer circle is used to fix to the support. The front guide drill bushing has four different size series with inner diameters of Φ6H8, Φ12H8, Φ14H8, Φ16H8 and an outer diameter of Φ40 to adapt to finish machining tools with different front guide diameters. Among them, the drill bushing with an inner diameter of Φ6H8 and an outer diameter of Φ40 has a thickness of 34 mm to ensure that the distance between the front guide of the tool and the tool testing part is 10 mm after installation, accurately simulating a specific finish machining condition. The thickness of the remaining front guide drill bushings is 24 mm.

[0069] The bracket clamp 15 is used to fix the position of the bracket on the track and prevent it from axially moving along the track during the tool trial. Rotating the clamp clockwise clamps it, and rotating it counterclockwise loosens it.

[0070] The limit post 16 is used to limit the movement range of the bracket on the track.

[0071] A flexible tool trial method for finish machining of aircraft laminated intersection holes is as follows:

[0072] 1. Place the fixture:

[0073] Use a hanging device to lift the fixture onto the workbench. After confirming that the fixture is placed stably on the workbench, remove the hanging device.

[0074] 2. Install and assemble the tool trial parts.

[0075] Loosen the clamp on the bracket and move the bracket along the track to provide enough space for installing the tool trial parts, the bracket, the air drill, and the tool.

[0076] According to the finish machining working conditions, install and assemble the tool trial parts on the rear guide and tool trial part bracket 10 and the front guide and tool trial part bracket 11, and confirm that the tool trial parts are firmly connected to the bracket.

[0077] 3. Install the drill bushing

[0078] Install the tool front guide drill bushing on the front guide and tool trial part bracket 11, and confirm that the front guide drill bushing is firmly connected to the bracket. Fix the tool front guide on the front guide drill bushing. According to different tool trial working conditions, install the rear guide drill bushing on the rear rear guide drill bushing 12 or the front rear guide drill bushing 13, and confirm that the rear guide drill bushing is firmly connected to the bracket. Install the tool rear guide on the rear guide drill bushing to complete the installation of the drill bushing and the tool.

[0079] 4. Install the tool and the high-power air drill / automatic feed drill

[0080] According to different tool trial working conditions, install the high-power air drill or the automatic feed drill. When installing the automatic feed drill, fix the automatic feed drill on the rear circular hole of the tool rest and rear guide bracket 9. When installing the high-power air drill, hold the high-power air drill in the middle of the tool rest and rear guide bracket 9. Connect the automatic feed drill / high-power air drill to the tool, and confirm that the tool is firmly connected to the automatic feed drill / high-power air drill.

[0081] 5. Adjust the position of the bracket:

[0082] Loosen all the clamps 15 on the brackets, and confirm that all the brackets are in a state where they can move freely along the track. According to the tool testing conditions, move the tool rest, the rear guide bracket 9, the rear guide and tool testing piece bracket 10, and the front guide and tool testing piece bracket 11 along the track to the specified positions. After confirming that the distances between all the brackets are accurate, tighten the clamps 15 on all the brackets, and confirm that all the brackets are in a clamped state.

[0083] 6. Start tool testing:

[0084] Connect the air source of the high-power pneumatic drill / automatic feed drill. After confirming the correct connection, turn on the high-power pneumatic drill / automatic feed drill. At a fixed feed rate, ensure that the high-power pneumatic drill / automatic feed drill feeds forward, and start the tool testing operation.

[0085] (During the tool testing operation, in addition to the operator, there should be a process technician or an auxiliary operator standing by to observe the tool testing situation. When the tool starts to ream the hole, the auxiliary operator should promptly inject cutting fluid into the tool and the tool testing piece to ensure the smooth progress of reaming. If the cutting resistance is too large and the tool cannot feed, or abnormal noise occurs, the high-power pneumatic drill / automatic feed drill should be immediately stopped, and the tool and the tool testing piece should be taken out to analyze the cause and troubleshoot in time).

[0086] During the tool testing process, replace the front and rear guide bushings and the tool according to the tool testing conditions. When the tool testing is approaching the end hole, promptly take out the tool testing piece, and use a plug gauge or an internal micrometer to check the inner hole accuracy.

[0087] 7. End the tool testing

[0088] Remove the tool testing piece and the front and rear guide bushings. After making marks on the tool testing piece for the tool testing results, store it properly. Loosen the bracket clamps, clean the cutting fluid stains on the tool testing brackets and the workbench. After confirming that it is clean, end the tool testing.

[0089] Finally, the present invention is not limited to the above description, but can cover any deformation scheme within the scope defined by the specification.

Claims

1. Flexible trial cutting tool assembly for finish machining of aircraft laminated intersection holes, characterized in that, The described flexible tool trial - cutting part assembly for finish - machining the aircraft laminated intersection hole includes a front - guiding direction tool trial - cutting part (1), a middle tool trial - cutting part (2), and a rear - guiding direction tool trial - cutting part (3). The front - guiding direction tool trial - cutting part (1) includes a middle tool trial - cutting part supporting boss (1 - 1), a material to be processed A (1 - 2), a tool trial - cutting part support bushing A (1 - 3), a tool trial - cutting part support connecting flange A (1 - 4), a bolt hole A (1 - 5), and a primary hole A (1 - 6). The middle tool trial - cutting part supporting boss (1 - 1) is used to fix the mating middle tool trial - cutting part (2) to prevent the axial movement of the middle tool trial - cutting part (2). The material to be processed A (1 - 2) is used to simulate the laminated working condition of the intersection hole. The tool trial - cutting part support bushing A (1 - 3) is used for the positioning and mating of the tool trial - cutting part with the tool trial - cutting part support of the tool trial - fixture. The tool trial - cutting part support connecting flange A (1 - 4) is used to connect the tool trial - cutting part with the tool trial - cutting part support of the tool trial - fixture. The bolt hole A (1 - 5) is provided on the tool trial - cutting part support connecting flange A (1 - 4). When installing the front - guiding direction tool trial - cutting part (1), the surface of the tool trial - cutting part support connecting flange A (1 - 4) is fitted with the surface of the tool trial - cutting part support of the tool trial - fixture. At the same time, the bolt hole A (1 - 5) of the tool trial - cutting part support connecting flange A (1 - 4) is aligned and coincided with the bolt hole A (1 - 5) of the tool trial - cutting part support of the tool trial - fixture. Then, bolts are installed and tightened to fasten the tool trial - cutting part support connecting flange A (1 - 4) to the tool trial - cutting part support of the tool trial - fixture, realizing the connection between the tool trial - cutting part and the tool trial - cutting part support of the tool trial - fixture. The primary hole A (1 - 6) is used to simulate the finish - machining working condition of the intersection hole. The middle tool trial - cutting part (2) includes a material to be processed B (2 - 1), an outer circle (2 - 2), a limiting plane A (2 - 3), an upper surface (2 - 4), a lower surface (2 - 5), and a primary hole B (2 - 6). The material to be processed B (2 - 1) is used to simulate the laminated working condition of the intersection hole. The outer circle (2 - 2) is in contact and mating with the middle tool trial - cutting part fixing bushing (3 - 4) of the rear - guiding direction tool trial - cutting part (3). The limiting plane A (2 - 3) is in contact and mating with the limiting plane B (3 - 6) of the rear - guiding direction tool trial - cutting part (3) to prevent the middle tool trial - cutting part (2) from rotating during the tool trial. The upper surface (2 - 4) is in contact and mating with the surface of the rear - guiding direction tool trial - cutting part (3), and the lower surface (2 - 5) is in contact and mating with the surface of the front - guiding direction tool trial - cutting part (1) to play a role in fixing and limiting. The primary hole B (2 - 6) is used to simulate the finish - machining working condition of the intersection hole. The rear guiding direction tool testing piece (3) includes a tool testing piece support connecting flange B (3-1), a bolt hole B (3-2), a primary hole C (3-3), a middle tool testing piece fixing bushing (3-4), a material to be processed C (3-5), a limiting plane B (3-6), and a tool testing piece support mating bushing B (3-7); the tool testing piece support connecting flange B (3-1) is used to connect the tool testing piece to the tool testing piece support of the tool testing fixture, and the bolt hole B (3-2) is provided on the tool testing piece support connecting flange B (3-1); when installing the rear guiding direction tool testing piece (3), the surface of the tool testing piece support connecting flange B (3-1) is fitted with the surface of the tool testing piece support of the tool testing fixture, and at the same time, the bolt hole B (3-2) of the tool testing piece support connecting flange B (3-1) is aligned and coincided with the bolt hole B (3-2) of the tool testing piece support of the tool testing fixture, and bolts are installed and tightened to fasten the tool testing piece support connecting flange B (3-1) to the tool testing piece support of the tool testing fixture, so as to realize the connection between the tool testing piece and the tool testing piece support of the tool testing fixture; the material to be processed C (3-5) is used to simulate the intersection hole lamination working condition, the primary hole C (3-3) is used to simulate the finish machining working condition of the intersection hole, and the middle tool testing piece fixing bushing (3-4) is used to fix the middle tool testing piece (2), the inner diameter of the middle tool testing piece fixing bushing (3-4) is in contact with the outer circle of the middle tool testing piece (2-2) and the support boss of the middle tool testing piece (1-1), and the end face of the middle tool testing piece fixing bushing (3-4) is in contact with the tool testing piece support connecting flange A (1-4) to play a role of fixing and positioning; the limiting plane B (3-6) of the rear guiding direction tool testing piece (3) is in contact and cooperation with the limiting plane A (2-3) of the middle tool testing piece (2) to prevent the middle tool testing piece (2) from rotating during the tool testing process; the function of the tool testing piece support mating bushing B (3-7) is to be in positioning cooperation with the tool testing piece support of the tool testing fixture.

2. The flexible tool trial assembly for finish machining of the laminated intersection holes of the aircraft according to claim 1, characterized in that, When it is necessary to simulate the finish machining working condition of intersection hole lamination with more than three layers, two or more tool testing pieces with the same structure can be axially overlapped and placed instead of the middle tool testing piece (2).

3. The flexible tool trial - cutting part assembly for finish - machining the laminated intersection holes of an aircraft according to claim 1, wherein, The height of the support boss of the middle tool testing piece (1-1) is 2-3 mm; the thickness of the material to be processed A (1-2) is 12-20 mm; the length of the tool testing piece support mating bushing A (1-3) is 10-12 mm, and the outer diameter is 40 mm; the diameter of the tool testing piece support connecting flange A (1-4) is 80-100 mm, and the thickness is 4-6 mm; the diameter of the bolt hole A (1-5) is 4-6 mm; the diameter of the primary hole A (1-6) is 10-14 mm.

4. The flexible trial cutting tool assembly for finish machining of the laminated intersection holes of an aircraft according to claim 1, wherein, The thickness of the material to be processed B (2-1) is 12-20 mm; the diameter of the outer circle (2-2) is 30-35 mm; the length of the limiting plane A (2-3) is 12-20 mm; the diameter of the primary hole B (2-6) is 10-14 mm.

5. The flexible tool trial assembly for finish machining of the laminated intersection holes of an aircraft according to claim 1, wherein The connecting flange B (3-1) of the tool testing piece support has a diameter of 80-100 mm and a thickness of 4-6 mm; the material to be processed B (2-1) has a thickness of 12-20 mm; the initial hole C (3-3) has a diameter of 10-14 mm; the outer diameter of the middle tool testing piece fixing bushing (3-4) is 40-50 mm, the inner diameter is 30-35 mm, and the length is 20-40 mm; the length of the limiting plane B (3-6) is 12-20 mm; the length of the tool testing piece support mating bushing B (3-7) is 10-12 mm, and the outer diameter is 40 mm.

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