Drilling, milling and detecting device for stringers with different cross sections

Abstract

The invention belongs to the technical field of aeronautical manufacturing, and relates to a drilling, milling and detecting device for stringers with different cross sections, which comprises a fixed chuck, a linear sliding rail and a pressing plate, the fixed chuck is made of L-shaped steel, and the upper surface of the fixed chuck is a first positioning molded surface which is matched with a stringer A surface; the vertical surface of the L-shaped transition surface of the fixed chuck is a second positioning surface and is matched with the B surface of the stringer; a plurality of pressing plates are uniformly arranged on the first positioning molded surface in the length direction and are used for pressing the upper surface of the stringer; a plurality of linear sliding rails are arranged on the horizontal plane of the L-shaped transition face of the fixed chuck, and the linear sliding rails are arranged in the length direction. A clamp sliding module is arranged on the linear sliding rail and used for clamping a stringer. A plurality of pneumatic pressing devices are arranged on the side wall of the fixed chuck and used for pressing the clamp sliding module.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation manufacturing and relates to a drilling and milling inspection device for long stringers with different cross sections. Background Art

[0002] Stringer structural parts are one of the important components of the aircraft fuselage. They are the main bearing and transmission structure of the aircraft fuselage axial force and bending moment. Its good design efficiency and design quality are one of the foundations to ensure the overall efficiency and performance of aircraft design and manufacturing. Stringer parts can be divided into C-type, T-type, L-type, E-type, etc. according to their appearance. Due to the precision of the structural design of aviation parts, the edge size of the stringer must be precisely controlled to meet the use requirements. Usually, the edge needs to be processed by milling.

[0003] Usually, in actual parts production, due to the needs of structural design, the same part may contain multiple long stringers with different structures and lengths. When the skin of the part is sunken, the corresponding lower surface of the long stringer must also be sunken, resulting in the complexity and diversity of the long stringer structure. In order to meet the requirements of milling processing, it is often necessary to design and manufacture multiple milling tooling, which prolongs the production cycle and increases production costs. Moreover, these tooling are usually only for one long stringer structure, and the practicality is extremely poor. The current process method has the following defects:

[0004] 1. There are many special fixtures, and the scope of use of the fixtures is narrow, which increases production costs and has poor practicality.

[0005] 2. The degree of automation of the fixture is low, and the fixture is still clamped manually, which is time-consuming and labor-intensive.

[0006] 3. Milling, drilling and inspection are completed on different tools. Workers need to clamp the tools multiple times, which makes it impossible to ensure the consistency of the benchmark and results in low machining accuracy. Summary of the invention

[0007] The purpose of the present invention is to provide a new process equipment structure. The tooling can meet the milling requirements of long trusses of different shapes, lengths and widths such as C, L, Z, and T, greatly saving production costs. In addition, the tooling integrates milling, drilling, and inspection. The product is clamped on the tooling at one time, reducing the clamping error, ensuring the uniqueness of the product and tooling design benchmark, and greatly improving the milling accuracy requirements of long truss parts. The use of automated clamping greatly improves production efficiency and liberates manual labor.

[0008] Technical Solution

[0009] A drilling, milling and inspection device for long beams with different cross sections, comprising: a fixed chuck, a linear slide rail and a pressure plate;

[0010] The fixing chuck is an L-shaped steel material, and the upper surface of the fixing chuck is a first positioning surface, which matches the A surface of the long stringer; the vertical surface of the L-shaped transition surface of the fixing chuck is a second positioning surface, which matches the B surface of the long stringer;

[0011] The first positioning profile is provided with a plurality of pressing plates evenly along the length direction for pressing the upper surface of the long stringer;

[0012] A plurality of linear slide rails are arranged on the horizontal plane of the L-shaped transition surface of the fixed chuck, and the linear slide rails are arranged in the length direction; a clamp sliding module is provided on the linear slide rail for clamping the long stringer;

[0013] The side wall of the fixed clamp is provided with a plurality of pneumatic clamping devices for pushing the sliding module of the clamp to move forward and backward.

[0014] Furthermore, a rectangular notch is provided at the front end of the first positioning profile, and a rectangular positioning block is installed in the rectangular notch to position the end of the long stringer.

[0015] Further, the fixture sliding module comprises: a sliding chuck, a slider, a pressing block and a bolt;

[0016] The lower surface of the sliding chuck is provided with two square notches for accommodating the slide block, through which the slide block slides on the linear slide rail;

[0017] One side of the sliding chuck is a third positioning surface, which matches the C surface of the long stringer, and the other side is provided with multiple T-shaped slots.

[0018] A bolt-connected pneumatic clamping device is provided in the T-slot.

[0019] Furthermore, a rectangular notch is provided at the front end of the upper surface of the sliding chuck, and a rectangular positioning block is installed in the rectangular notch to position the end of the long stringer.

[0020] Furthermore, the second positioning profile of the fixing clamp is provided with a first U-shaped groove, and the first U-shaped groove is arranged along the length direction of the fixing clamp.

[0021] Furthermore, the third positioning profile of the sliding chuck is provided with a second U-shaped groove, and the second U-shaped groove is equal in size to the first U-shaped groove and is symmetrically arranged.

[0022] Further, the pneumatic clamping device comprises: a cylinder, a cylinder pad;

[0023] The cylinder gasket is connected to the side wall of the fixing chuck by bolts;

[0024] The cylinder is fixed on the cylinder backing plate, and is connected to the sliding chuck through bolts. The cylinder pushes the bolts through the movement of the piston to drive the sliding chuck to move forward and backward.

[0025] Furthermore, the cylinder backing plate is also provided with a threaded hole, the clamping screw is screwed into the threaded hole, and a handle is provided at the rear end of the clamping screw;

[0026] A pressing block is arranged in the T-slot of the sliding chuck, and self-locking is achieved by pressing the pressing block through a pressing screw.

[0027] Furthermore, the second positioning profile of the fixed chuck is provided with a plurality of grooves, and the third positioning profile of the sliding chuck is provided with a plurality of grooves to avoid the long stringer.

[0028] Furthermore, the first, second and third positioning profiles are planes, curved surfaces and hyperbolic surfaces, which match the profiles of the long stringers.

[0029] Beneficial effects: The present invention provides a flexible tooling for milling, drilling and inspection of (C, L, Z, T) type long girders, which has the following beneficial effects: (1) It adopts a modular structure, and the same modules with a length of 1.5 to 2 meters are connected by pins, so that the tooling length can reach 30 meters, and each module is provided with a U-shaped notch. Therefore, this tooling can meet the milling requirements of long girders of different shapes, lengths and widths such as C, L, Z, and T, greatly saving production costs. (2) The use of pneumatic clamping and sliding fast pressing devices realizes mechatronics, greatly improves production efficiency, and liberates manual labor. (3) Milling, drilling, and inspection are integrated into one, reducing clamping errors, ensuring the uniqueness of the benchmark, and improving the processing accuracy of long girders parts to within 0.05 mm. (4) The clever design of the mechanical self-locking function can avoid scratches on the long girders profile and achieve the purpose of protecting the safety of workers. (5) The milling, drilling and inspection of complex hyperbolic long girders can be integrated into one unit, so that the accuracy of a hyperbolic long girder that is several meters long can be improved to within 0.2 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention includes 5 drawings, and the drawings and the descriptions of the drawings are as follows:

[0031] Figure 1 The main view of the long stringer profiles of different shapes of aircraft;

[0032] Figure 2 This is the main view of the flexible tooling for milling, drilling and inspection of (C, L, Z, T) type flat long stringer profiles;

[0033] Figure 3 This is the main view of the fixture fixing module system;

[0034] Figure 4 This is the front view of the fixture sliding module system;

[0035] Figure 5 This is the front view of the pneumatic clamping and locking system of the fixture;

[0036] Figure 6This is a schematic diagram of the clamping process of the long stringer profile;

[0037] Figure 7 This is the front view of the Z-shaped hyperbolic long girder profile;

[0038] Figure 8 This is the main view of the flexible tooling for milling, drilling and inspection of Z-shaped hyperbolic long girder profiles;

[0039] Among them: 01. fixed chuck, 02. rectangular positioning block, 03. linear slide rail, 04. pressure plate, 05. positioning surface 1, 06. positioning surface 2, 07. screw, 08. sliding chuck, 09. rectangular positioning block, 10. square slider, 11. pressure block, 12 bolt, 13. U-shaped slot 1, 14. U-shaped slot 2, 15. cylinder, 16. cylinder pad, 17. screw, 18. curved surface fixed chuck, 19. curved surface sliding chuck. DETAILED DESCRIPTION

[0040] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: as shown in the figure, a flexible tooling for (C, L, Z, T) type long-beam milling, drilling and inspection is provided, which is a structure formed by connecting multiple identical modules with a length of 1.5 to 2 meters. Each independent module is divided into a clamp fixing system, a clamp sliding module system, a pneumatic clamping and a mechanical self-locking system.

[0041] The fixture fixing module system is composed of a fixing chuck 01, a rectangular positioning block 02, a linear slide 03, and a pressure plate 04. The fixing chuck 01 is an L-shaped steel structure. The upper surface and side surfaces of the fixing chuck 01 are provided with positioning surfaces 05 and 06 that match the A surface and B surface of the long stringer part. A rectangular notch is provided at the front end of the positioning surface 05, and a rectangular positioning block 02 is provided inside for positioning the end of the long stringer profile. A row of threaded holes is provided in the upper X direction of the positioning surface 05 for installing the evenly distributed pressure plate 04 to achieve the clamping of the upper surface of the long stringer profile. Several threaded holes are provided on the lower surface of the fixing chuck 01 for connecting the linear slide 03. Several threaded holes are also provided on the lower side of the fixing chuck 01, and screws 07 are provided inside for connecting the pneumatic clamping device.

[0042] The fixture sliding module system consists of a sliding chuck 08, a rectangular positioning block 09, a square slider 10, a pressure block 11 and a bolt 12. The sliding chuck 08 is a rectangular steel structure. A rectangular notch is provided on its upper surface, and a rectangular positioning block 09 is provided inside for positioning the end of the long stringer part. Two square notches are provided at its bottom, and a square slider 10 is placed inside it, which is connected to the sliding chuck 09 by bolts to form a sliding part. Three T-shaped notches are provided on one side, and a pressure block 11 and a bolt 12 are provided inside. The pressure block 11 is connected to the self-locking system, and the screw 12 is connected to the pneumatic clamping system.

[0043] At the same time, U-shaped notches 13 and 14 are provided on the sides of the fixed clamp 01 and the sliding clamp 08, which form a square-shaped notch to avoid the non-processing part of the long stringer profile.

[0044] The pneumatic clamping system is composed of a cylinder 15 and a cylinder pad 16. The cylinder pad is provided with several bolt holes, which are connected to the fixed chuck 01 by screws 07. Bolts 12 connect the cylinder and the sliding chuck together. When the cylinder is filled with air, pneumatic pressure is provided by the air source to push the bolt 12 to move, thereby driving the sliding chuck 10 to move forward and backward on the linear slide 3.

[0045] The mechanical self-locking system is composed of a clamping screw 17 to realize the self-locking function of the clamp. When the sliding chuck moves to a suitable position, the clamping screw 17 acts on the pressure block 11 to tighten the fixture, which can prevent the long stringer profile from being scratched during the movement of the cylinder and protect the safety of the workers.

[0046] Combined with the accompanying drawings, the flexible tooling and method for (C, L, Z, T) type long stringer milling and drilling inspection of the present invention are described in detail: First, the end face "A" of the aircraft long stringer profile is placed on the positioning profile 05 of the fixed chuck 01, and at the same time, the side "B" of the long stringer part is ensured to fit with the positioning profile 06 of the fixed chuck 01. The sliding chuck 08 of the long stringer part is driven by the pneumatic clamping device controlled by the pneumatic control system to move back and forth. The square slider 10 on the sliding chuck 08 slides on the linear slide rail 03. When the side of the sliding chuck 08 slides to contact the C surface of the long stringer profile, the locking tooling is pressed down. The specific implementation method is as follows:

[0047] (1) Place the end face “A” of the aircraft stringer part on the positioning profile 05 of the fixing chuck 01, and at the same time ensure that the side face “B” of the aircraft stringer part fits in with the positioning profile 06 of the fixing chuck 01;

[0048] (2) Place the sliding chuck 08 on the upper part of the fixed chuck 01, and start to supply air through the pneumatic control system. When the cylinder is supplied with air, the pneumatic pressure is provided through the air source to push the bolt 12 to move, thereby driving the sliding chuck 08 to move on the linear slide rail 03 until the side of the sliding chuck fits the "C" surface of the long stringer profile;

[0049] (3) The clamping force is set through the pneumatic control system so that the sliding chuck 08 is completely in contact with the side "C" of the long string part, and then the pressing plate 04 is pressed against the surface of the long string part one by one to completely fix the part in the tooling.

[0050] (4) Tighten screw 17 to lock the tool and close the gas path. Place the tool on the machine tool to mill the edge of the aircraft long stringer part.

[0051] (4) On a five-axis machine tool, part edge detection can be completed using a micrometer.

[0052] (5) After completing the part edge detection, the clamping force is unloaded through the control of the pneumatic control system, so that the sliding chuck 08 moves in the opposite direction of the long stringer profile, so that the distance between them can be closed when the long stringer profile is taken out, the pressure plate is removed, and the long stringer profile is taken out.

[0053] In actual parts production, due to the needs of structural design, the same part may contain multiple long stringers with different structures and lengths. When the skin of the part has a sag, the corresponding lower surface of the long stringer must also have a corresponding sag, so there will be single-curvature and double-curvature long stringer profiles. This tooling is also applicable to such complex long stringer profiles.

[0054] For complex single-curved and double-curved long girders, it is only necessary to replace the fixed chuck 01 and the sliding chuck 08 in the module with the curved fixed chuck 18 and the curved sliding chuck 19. The upper surface of the curved fixed chuck 18 is a curved surface that matches the curved surface D of the long girder profile, and its side surface is a curved surface that matches the curved surface E of the long girder profile. The side of the curved sliding chuck 19 is a curved surface that matches the curved surface F of the long girder profile. The specific implementation is the same as that of the flat long girder profile.

Claims

1. A drilling and milling inspection device for long stringers with different cross sections, characterized in that: include: Fixed chuck, linear slide rail, pressure plate; The fixing chuck is an L-shaped steel material, and the upper surface of the fixing chuck is a first positioning surface, which matches the A surface of the long stringer; the vertical surface of the L-shaped transition surface of the fixing chuck is a second positioning surface, which matches the B surface of the long stringer; The first positioning profile is provided with a plurality of pressing plates evenly along the length direction for pressing the upper surface of the long stringer; A plurality of linear slide rails are arranged on the horizontal plane of the L-shaped transition surface of the fixed chuck, and the linear slide rails are arranged in the length direction; a clamp sliding module is provided on the linear slide rail for clamping the long stringer; The side wall of the fixed clamp is provided with a plurality of pneumatic clamping devices for clamping the sliding module of the clamp.

2. The device according to claim 1, characterized in that A rectangular notch is provided at the front end of the first positioning profile, and a rectangular positioning block is installed in the rectangular notch to position the end of the long stringer.

3. The device according to claim 2, characterized in that: The fixture sliding module includes: a sliding chuck, a slider, a pressing block and a bolt; The lower surface of the sliding chuck is provided with two square notches for accommodating the slide block, through which the slide block slides on the linear slide rail; One side of the sliding chuck is a third positioning surface, which matches the C surface of the long stringer, and the other side is provided with multiple T-shaped slots. A bolt-connected pneumatic clamping device is provided in the T-slot.

4. The device according to claim 3, characterized in that: A rectangular notch is arranged at the front end of the upper surface of the sliding chuck, and a rectangular positioning block is installed in the rectangular notch to position the end of the long stringer.

5. The device according to claim 4, characterized in that The second positioning profile of the fixing clamp is provided with a first U-shaped groove, and the first U-shaped groove is arranged along the length direction of the fixing clamp.

6. The device according to claim 5, characterized in that The third positioning profile of the sliding chuck is provided with a second U-shaped groove, and the second U-shaped groove is equal in size to the first U-shaped groove and is symmetrically arranged.

7. The device according to claim 6, characterized in that The pneumatic clamping device includes: a cylinder and a cylinder pad; The cylinder gasket is connected to the side wall of the fixing chuck by bolts; The cylinder is fixed on the cylinder backing plate, and the piston of the cylinder is connected with the sliding chuck through bolts.

8. The device according to claim 7, characterized in that The cylinder pad is also provided with a threaded hole, in which a clamping screw is screwed, and a handle is provided at the rear end of the clamping screw; A pressing block is arranged in the T-slot of the sliding chuck, and self-locking is achieved by pressing the pressing block through a pressing screw.

9. The device according to claim 8, characterized in that The second positioning profile of the fixed clamp is provided with a plurality of profile grooves, and the third positioning profile of the sliding clamp is provided with a plurality of profile grooves to avoid the long stringer.

10. The device according to claim 9, characterized in that The first, second and third positioning profiles are plane, curved and hyperbolic surfaces, which match the profiles of the long stringers.

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