Composite material part profile detection device and use method thereof

Abstract

The invention provides a composite material part molded surface detection device and a use method thereof. The composite material part molded surface detection device comprises a support, a positioning tool, a plurality of force application devices, a force application detection device and a force application control system. The positioning tool is connected to the support and used for supporting the molded surface of the composite material part. The plurality of force applying devices are connected to the bracket and are used for applying set clamping pressure to a plurality of point positions on the composite material part; the force application detection device is electrically connected to the force application device and used for detecting the actual clamping pressure of the corresponding point position. The force application control system is electrically connected to the force application devices and the force application detection device, and the force application control system is used for regulating and controlling the magnitude of the clamping pressure applied to the multiple point positions by the multiple force application devices so that the deviation value between the actual clamping pressure at the multiple point positions and the set clamping pressure can be within the preset range. According to the invention, the molded surface detection requirements of large-size composite material parts with different structures can be met, the operation is simple, and the detection efficiency and the result reliability are high.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material parts manufacturing, and more specifically, to a composite material parts profile detection device and a use method thereof. Background Art

[0002] Nowadays, composite materials have been widely used in aircraft fuselages, wings, engines and other structures due to their advantages such as light weight, high strength, excellent performance and good corrosion resistance. The aviation industry has put forward higher requirements for the surface accuracy of composite products to meet the development trend of stealth and high speed of aircraft. Such components are usually assembled from multiple composite parts through metal parts and fasteners. Therefore, it involves the problem of assembly surface matching of multiple composite parts. It is necessary to detect the surface of the parts. Usually, it is necessary to apply a uniform clamping force to the parts. If the force is uneven and the force accuracy does not meet the requirements, the surface detection data will be unreliable, which will affect the assembly and matching of the parts. In severe cases, forced assembly may cause internal damage to the parts. At present, the surfaces of aircraft parts are complex and large in size, involving reinforced wall panel structures, honeycomb sandwich structures, rotating bodies and other structures. It is difficult to fix and load the parts, and the detection efficiency is low.

[0003] At present, the traditional detection method is generally to apply a certain weight of weight or sandbag on the surface of the composite part, and use a feeler gauge to detect the gap between the composite part and the tooling. It cannot meet the requirements of uniform force application and full coverage detection of the part surface, and this method is only applicable to small-sized parts such as skins, beams, and ribs. The operation steps are complicated and the detection efficiency is low. When using laser trackers, blue light scanners and other methods to detect the part surface, the parts usually need to be fixed on the part jig and manually inspected. This method has cumbersome steps, low efficiency, and it is difficult to maintain stable force, which affects the detection results and data stability. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is that the existing detection devices have the problems of unreliable detection data, complicated operation steps and low detection efficiency.

[0006] (II) Technical solution

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In the first aspect, the present invention provides a composite material part profile detection device, which is used to apply force to various points on the composite material profile, including a bracket, a positioning tool, a plurality of force applying devices, a force detecting device and a force control system; the positioning tool is connected to the bracket, and is used to support the profile of the composite material part; a plurality of force applying devices are connected to the bracket, and are used to apply set clamping pressure to a plurality of points on the composite material part; a force detecting device is electrically connected to the force applying device, and is used to detect the actual clamping pressure at the corresponding points; the force control system is electrically connected to the force applying device and the force detecting device, respectively, and the force control system is used to regulate the magnitude of the clamping pressure applied by the plurality of force applying devices to the corresponding points, so that the deviation values ​​between the actual clamping pressure at the plurality of points and the set clamping pressure are within a preset range.

[0009] Preferably, the force-applying device includes a support, a force-applying rod, a driving assembly and a pressure sensor, the support is slidably connected to the bracket, the force-applying rod is connected to the support, the output end of the driving assembly is connected to the force-applying rod, the driving assembly is used to drive the force-applying rod to move so as to apply a set clamping pressure to a point on the composite material part, and the pressure sensor is arranged at the end of the force-applying rod and is electrically connected to the force detection device.

[0010] Preferably, a plurality of the force applying rods are arranged at intervals on the support, and a preset distance is spaced between two adjacent force applying rods.

[0011] Preferably, the preset distance is 100 mm to 700 mm.

[0012] Preferably, the positioning tool includes a profile clamp and a fixed base, both of which are connected to the bracket, the fixed base is used to clamp the bottom of the composite material part, and the profile clamp is used to support the profile of the composite material part.

[0013] Preferably, the profile clamp has a supporting surface for abutting against the profile of the composite material part, and the shape of the supporting surface is adapted to the shape of the profile.

[0014] Preferably, the fixed base comprises a fixed block and a clamping block, the fixed block is fixedly connected to the bracket, and the clamping block is detachably connected to the fixed block.

[0015] Preferably, it also includes a slide rail, which is connected to the bracket, the length direction of the slide rail is parallel to the normal direction of the profile of the composite material part, and the force applying device is slidably connected to the slide rail.

[0016] Preferably, it further comprises a driving unit, an output end of which is connected to the force applying device, and the driving unit is used to drive the force applying device to move along the length direction of the slide rail.

[0017] In a second aspect, the present invention further provides a method for using the composite material part profile detection device described in any one of the above technical solutions, comprising the following steps:

[0018] Installing a composite material part on the positioning fixture, wherein the composite material part is arranged between the positioning fixture and the force applying device, and making the positioning fixture fit the profile of the composite material part;

[0019] Starting the plurality of force applying devices, so that the plurality of force applying devices respectively apply set clamping pressure to corresponding points on the composite material part;

[0020] The force detection device detects the actual clamping pressure at the corresponding point and feeds back the actual clamping pressure to the force control system;

[0021] The force control system calculates the deviation between the set clamping pressure and the actual clamping pressure at the corresponding point, and regulates the force application device according to the deviation so that the deviation between the actual clamping pressure and the set clamping pressure at the corresponding point is within a preset range.

[0022] (III) Beneficial effects

[0023] The above technical solution of the present invention has at least the following advantages:

[0024] 1. In the present invention, a plurality of force-applying devices are provided to apply set clamping pressures to a plurality of points on the composite material part, and a force-applying detection device is used to monitor the actual clamping pressures of the corresponding points in real time. The force-applying control system receives the detection data transmitted in real time by the force-applying detection device, and adjusts the clamping pressures applied by the plurality of force-applying devices to the corresponding points, so that the deviation values ​​between the actual clamping pressures at the plurality of points and the set clamping pressures are within a preset range, thereby achieving uniform force application to each point on the surface of the composite material part. After the force application is completed, the surface data of the composite material part is collected to complete the detection process. Compared with the traditional detection scheme, the present invention can accurately control the deviation values ​​between the actual clamping pressures at each point and the set clamping pressures within a preset range, thereby improving the detection accuracy and ensuring the reliability of the data finally obtained. In addition, the operation steps are simple, and a plurality of force-applying devices can detect a plurality of points at the same time, so that the detection efficiency is high.

[0025] 2. The present invention can meet the surface detection requirements of parts with different structures and large sizes, and is particularly advantageous for honeycomb sandwich structures and reinforced wall panel structures. During the detection process, the manual operation process is simple. After the composite material parts are fixed on the positioning fixture, it is only necessary to input the value of the clamping pressure in the operation interface of the force control system to achieve stable loading of the composite material parts. In addition, the present invention can achieve surface detection requirements of composite material parts in multiple states, such as uniform force state, free state, edge force state, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic structural diagram of a composite material part profile detection device provided in an embodiment of the present invention.

[0028] Figure 2 It is a structural schematic diagram of a force applying device provided in an embodiment of the present invention.

[0029] Figure 3 It is a structural schematic diagram of a fixed base provided in an embodiment of the present invention.

[0030] Figure 4 It is a flow chart of a method for using the composite material part profile detection device provided in an embodiment of the present invention.

[0031] The reference numerals in the figures are:

[0032] 10. Composite material parts; 1. Bracket; 2. Positioning tooling; 3. Force-applying device; 4. Force-applying detection device; 5. Force-applying control system; 6. Slide rail; 7. Driving unit; 21. Profile clamping plate; 22. Fixed base; 221. Fixed block; 222. Clamping block; 31. Support; 32. Force-applying rod; 33. Driving assembly; 34. Pressure sensor. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0035] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The specific implementation of the present invention is described in more detail below in conjunction with specific embodiments:

[0037] like Figure 1 As shown ( Figure 1 The left side is the main view, and the right side is the side view), an embodiment of the present invention provides a composite part profile detection device, which is used to apply force to various points on the composite surface, including a bracket 1, a positioning tool 2, a plurality of force devices 3, a force detection device 4 and a force control system 5; the positioning tool 2 is connected to the bracket 1, and is used to support the profile of the composite part 10; the plurality of force devices 3 are connected to the bracket 1, and are used to apply set clamping pressure to multiple points on the composite part 10; the force detection device 4 is electrically connected to the force device 3, and is used to detect the actual clamping pressure of the corresponding points; the force control system 5 is electrically connected to the force device 3 and the force detection device 4, respectively, and the force control system 5 is used to adjust the size of the clamping pressure applied by the plurality of force devices 3 to the corresponding points, so that the deviation value between the actual clamping pressure at the plurality of points and the set clamping pressure is within a preset range. The force detection device 4 converts the detected actual clamping pressure value into an electrical signal and transmits it to the force control system 5. Then the force control system 5 controls the force device 3 to increase or decrease the force signal to adjust the clamping pressure value applied by the force device 3 at the corresponding point, thereby forming a negative feedback closed-loop control system.

[0038] like Figure 2As shown, in one embodiment, the force-applying device 3 includes a support 31, a force-applying rod 32, a driving assembly 33 and a pressure sensor 34. The support 31 is slidably connected to the bracket 1, the force-applying rod 32 is connected to the support 31, the output end of the driving assembly 33 is connected to the force-applying rod 32, the driving assembly 33 is used to drive the force-applying rod 32 to move, so as to apply a set clamping pressure to a point on the composite material part 10, and the pressure sensor 34 is arranged at the end of the force-applying rod 32 and is electrically connected to the force-applying detection device 4. Specifically, the force-applying rod 32 is arranged at equal intervals according to the size, shape and detection requirements of the composite material part to meet the principle of uniform force application, and the longitudinal and lateral spacings of the arrangement spacing are recommended to be 100mm to 700mm. The telescopic range of the force-applying rod 32 is 40mm to 200mm, and the end of the force-applying rod 32 is provided with a rubber cap, which can provide a pressure in the range of 0 to 500N. The pressure sensor 34 can detect the actual clamping pressure of the corresponding point in real time and transmit it to the force-applying detection device 4. Furthermore, the driving component 33 is a compressed air source, one end of which is connected to an air compressor through an air pipe, providing 2MPa to 7MPa of compressed gas, and equipped with a pressure gauge to monitor the actual pressure. The other end of the compressed air source is connected to the force rod 32, which can drive the force rod 32 to extend and retract, thereby achieving contact with the composite material part 10 and applying a set clamping pressure to a point on the composite material part 10. Its specific working principle is similar to the working principle of a cylinder, and this application will not be repeated. The thrust loading direction of the force rod 32 should be normal to the contact point on the back of the composite material part, which can be achieved by adjusting the angle of the force rod 32.

[0039] Specifically, the force detection device 4 is a set of pressure transmitters. The pressure sensor 34 next to the force rod 32 detects the real-time part clamping force of the force rod 32. The pressure transmitter converts the pressure signal into an electrical signal and transmits it to the force control system 5. The force control system 5 is used to receive or transmit electrical signals to the force device 3, and can independently control the clamping pressure applied by the force device 3 at each point. The force detection device 4 has a human-machine operation interface, which can facilitate user operation, adjust the clamping pressure, and display the actual clamping pressure value.

[0040] In one embodiment, the support 31 is provided with a plurality of force rods 32 at intervals, and a preset distance is provided between two adjacent force rods 32. The preset distance is provided between two adjacent force rods 32, and the value of the preset distance is determined according to the inspection specification of the composite material parts. Preferably, the preset distance is 100 mm to 700 mm.

[0041] In one embodiment, the positioning tool 2 includes a profile clamp 21 and a fixed base 22, both of which are connected to the bracket 1, the fixed base 22 is used to clamp the bottom of the composite material part 10, and the profile clamp 21 is used to support the profile of the composite material part 10. Specifically, the profile clamp 21 can be an integrated structure or a split structure. The profile clamp 21 installed on the bracket 1 is consistent with the theoretical profile contour of the composite material part at the corresponding point, and the corresponding profile clamp 21 is required to support the composite material part at the force application point of the force application device 3. For example, the composite material part 10 can be a thin-walled skin structure, a curved surface structure with curvature, a special-shaped open structure, etc. Correspondingly, the profile clamp 21 is changed according to the profile features required to be detected by the composite material part 10, and the force application rod 32 is evenly arranged according to the detection point and detection requirements. The opposite side of each force application point needs to have a corresponding profile clamp 21 to bear the set clamping pressure to form a clamping force. When the profile clamp 21 is a split structure, the number of profile clamps 21 needs to be set according to the size of the composite material part. Specifically, the spacing between the clamps is preferably 100 mm to 700 mm. More specifically, in this embodiment, the thickness of the profile clamp 21 is preferably 30 mm.

[0042] In one embodiment, the profile clamping plate 21 has a supporting surface for abutting against the profile of the composite material part 10 , and the shape of the supporting surface is adapted to the shape of the profile.

[0043] like Figure 3 As shown, Figure 3 2 are cross-sectional views of the fixed base 22 in two directions perpendicular to each other. In one embodiment, the fixed base 22 includes a fixed block 221 and a clamping block 222. The fixed block 221 is fixedly connected to the bracket 1, and the clamping block 222 is detachably connected to the fixed block 221. Specifically, the clamping block 222 is an aluminum block with a T-shaped cross section, and the fixed block 221 is an aluminum block with a U-shaped cross section. The clamping block 222 can be embedded in the raised part of the fixed block 221. Usually, the clamping block 222 is designed with a variety of thickness specifications to meet the requirements of the composite material part 10 being clamped in a state where no margin is required. Preferably, the fixed base 22 is provided with a certain inclination angle (less than 10°) to facilitate the composite material part 10 to be placed close to the profile clamping plate 21 to ensure that it is clamped in place when force is applied. In addition, fasteners can be provided on the clamping block 222 to fasten and fix the composite material part. As a preferred implementation mode of this embodiment, in response to specific part inspection posture requirements, in addition to being fixed to the bracket 1 through a fixed base, the composite material part 10 may be provided with positioning holes and inspection holes in the margin area (area that does not require inspection) around the composite material part, and positioning pins may be used to pass through the positioning holes to connect and fix the composite material part to the bracket 1.

[0044] In one embodiment, a slide rail 6 is further included, the slide rail 6 is connected to the bracket 1, the length direction of the slide rail 6 is parallel to the normal direction of the profile of the composite material part 10, and the force applying device 3 is slidably connected to the slide rail 6. Specifically, the force applying device 3 can move forward and backward on the slide rail 6, and the front and rear ends of the slide rail 6 are both provided with limit blocks. When the platform slides to the front limit block, the spacing between the force applying rod 32 and the profile of the composite material part 10 is 10mm to 100mm.

[0045] In one embodiment, a driving unit 7 is further included, wherein an output end of the driving unit 7 is connected to the force applying device 3 , and the driving unit 7 is used to drive the force applying device 3 to move along the length direction of the slide rail 6 .

[0046] like Figures 1 to 4 As shown, an embodiment of the present invention further provides a method for using any one of the composite material part surface detection devices in the above embodiments, comprising the following steps (herein, the composite material part surface detection device corresponding to the embodiment shown in the figure is used as an example for description):

[0047] The composite material part 10 is installed on the positioning fixture 2, and the composite material part 10 is arranged between the positioning fixture 2 and the force-applying device 3, and the positioning fixture 2 is made to fit the profile of the composite material part 10; specifically, before use, the circuits of each electrical component and the compressed air circuit used to drive the force-applying device 3 to apply force need to be connected, and the clamping pressure loading scheme for each point of the composite material part is set in the operation interface of the force-applying control system 5, and the input value of the set clamping pressure is set in sequence, for example, the set clamping pressure can be 45N; then the support 31 is pulled open to the maximum spatial position along the length direction of the slide rail 6, and the composite material part 10 is transferred to the fixed base 22 of the positioning fixture 2, so that the profile to be detected of the composite material part 10 is close to the profile clamping plate 21, and the gap between the profile clamping plate 21 and the profile of the composite material part 10 is checked. If the gap is too large, the placement position of the composite material part is appropriately adjusted. Next, the support 31 is pushed forward along the length direction of the slide rail 6 to the position of the front end limit block, at which time the spacing between the force-applying rod 32 and the back of the profile of the composite material part is about 20mm.

[0048] Start multiple force-applying devices 3, and each of the multiple force-applying devices 3 applies set clamping pressure to the corresponding points on the composite material part 10; specifically, when in use, check whether the set clamping pressure setting in the operation interface of the force-applying control system 5 is correct. After confirming that it is correct, click the input confirmation button, and the force-applying rod 32 applies the set clamping pressure to the composite material part, and with the support of the back profile clamping plate 21, a clamping force is formed on the composite material part.

[0049] The force detection device 4 detects the actual clamping pressure at the corresponding point, and feeds back the actual clamping pressure to the force control system 5; specifically, after loading is completed, the feedback value of the actual clamping pressure displayed on the operation interface of the force control system 5 is checked.

[0050] The force control system 5 calculates the deviation between the set clamping pressure and the actual clamping pressure at the corresponding point, and adjusts the force application device 3 according to the deviation so that the deviation between the actual clamping pressure and the set clamping pressure at the corresponding point is within a preset range. Specifically, the deviation between the actual clamping pressure and the set clamping pressure is controlled to be less than 10%.

[0051] Next, debug the laser tracker or blue light scanner equipment, check the target error value as required, and complete the surface scanning and data collection of the composite parts.

[0052] Finally, by clicking the "force rod retreat" button in the operation interface of the force control system 5, the clamping pressure can be released, the force device 3 can be pulled open along the slide rail 6, the composite material part 10 can be taken out, and the inspection is completed.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite material part surface detection device, used to apply force to each point on the composite material surface, characterized in that: include: Bracket; A positioning tool, connected to the bracket, for supporting the profile of the composite material part; A plurality of force applying devices, connected to the support, for applying a set clamping pressure to a plurality of points on the composite material part; A force detection device, electrically connected to the force application device, for detecting the actual clamping pressure at the corresponding point; A force control system is electrically connected to the force applying device and the force detecting device respectively, and is used to adjust the clamping pressure applied by multiple force applying devices to corresponding points so that the deviation value between the actual clamping pressure at multiple points and the set clamping pressure is within a preset range.

2. The composite material part surface detection device according to claim 1, characterized in that: The force-applying device includes a support, a force-applying rod, a driving assembly and a pressure sensor. The support is slidably connected to the bracket, the force-applying rod is connected to the support, the output end of the driving assembly is connected to the force-applying rod, and the driving assembly is used to drive the force-applying rod to move so as to apply a set clamping pressure to a point on the composite material part. The pressure sensor is arranged at the end of the force-applying rod and is electrically connected to the force-applying detection device.

3. The composite material part surface detection device according to claim 2, characterized in that: The support is provided with a plurality of force-applying rods at intervals, and a preset distance is spaced between two adjacent force-applying rods.

4. The composite material part surface detection device according to claim 3, characterized in that: The preset distance is 100 mm to 700 mm.

5. The composite material part surface detection device according to claim 1, characterized in that: The positioning tool includes a profile clamp and a fixed base, both of which are connected to the bracket. The fixed base is used to clamp the bottom of the composite material part, and the profile clamp is used to support the profile of the composite material part.

6. The composite material part surface detection device according to claim 5, characterized in that: The profile clamping plate has a supporting surface for abutting against the profile of the composite material part, and the shape of the supporting surface is adapted to the shape of the profile.

7. The composite material part surface detection device according to claim 5, characterized in that: The fixed base comprises a fixed block and a clamping block, and the fixed block is fixedly connected to the bracket.

8. The composite material part surface detection device according to claim 1, characterized in that: It also includes a slide rail, which is connected to the bracket. The length direction of the slide rail is parallel to the normal direction of the profile of the composite material part, and the force application device is slidably connected to the slide rail.

9. The composite material part surface detection device according to claim 8, characterized in that: It also includes a driving part, the output end of which is connected to the force applying device, and the driving part is used to drive the force applying device to move along the length direction of the slide rail.

10. A method for using the composite material part surface detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Installing a composite material part on the positioning fixture, wherein the composite material part is arranged between the positioning fixture and the force applying device, and making the positioning fixture fit the profile of the composite material part; Starting the plurality of force applying devices, so that the plurality of force applying devices respectively apply set clamping pressure to corresponding points on the composite material part; The force detection device detects the actual clamping pressure at the corresponding point and feeds back the actual clamping pressure to the force control system; The force control system calculates the deviation between the set clamping pressure and the actual clamping pressure at the corresponding point, and regulates the force application device according to the deviation so that the deviation between the actual clamping pressure and the set clamping pressure at the corresponding point is within a preset range.

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