Auxiliary detection tool and method for molded surface of large-size annular composite material part

Abstract

The invention discloses an auxiliary detection tool and method for a molded surface of a large-size annular composite material part, the auxiliary detection tool comprises a positioning frame, a positioning device and a shape righting device, the positioning device and the shape righting device are annularly arrayed on the positioning frame, and the positioning frame defines a mounting area used for positioning the annular composite material part. The positioning device is installed on one side of the positioning frame through a turnover mechanism and used for axially pressing the annular composite material part, and the shape correcting device is fixedly connected with the positioning device and used for correcting the annular composite material part from the inner side in the radial direction. According to the detection method adopting the auxiliary detection tool, the defect that the molded surface of the large-size annular composite material part is difficult to detect in the prior art is overcome, the deformation of the large-size annular composite material part is reduced, meanwhile, positioning is firm, operation is convenient and fast, and the detection efficiency and the detection quality can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, specifically to an auxiliary inspection fixture and method for the profile of a large-size annular composite material part. Background Technology

[0002] Aero engines contain various annular structural components (such as fan casings and inlet duct inner walls), which are large in size, typically exceeding 2100mm in diameter. As the power plant for aircraft during flight, the surface accuracy of the internal duct flow surfaces of aero engines affects the airflow direction during flight, thus impacting flight safety. The annular components in aero engines are typically operated with their axes parallel to the ground. Therefore, stringent requirements are placed on the surface accuracy of the flow surfaces of engine components in this parallel state (e.g., a profile tolerance of 0.5). However, for large annular components, current five-axis machine tools can only machine them when their axes are perpendicular to the ground. During post-machining inspection, the components deform due to their own weight, failing to meet the surface accuracy requirements. Therefore, tooling is needed to preserve the shape of the components and ensure the surface accuracy requirements are met during inspection. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an auxiliary inspection fixture and method for the surface of large-sized annular composite material parts. This inspection method overcomes the difficulty in inspecting the surface of large-sized annular composite material parts in existing technologies, reduces the deformation of large-sized annular composite material parts, and provides firm positioning and convenient operation, thereby effectively improving inspection efficiency and quality.

[0004] An auxiliary inspection fixture for the surface of a large-sized annular composite material part includes a positioning frame, a positioning device and a straightening device arranged in a ring on the positioning frame. The positioning frame encloses an installation area for positioning the annular composite material part. The positioning device is mounted on one side of the positioning frame via a flipping mechanism for axially pressing the annular composite material part. The straightening device is fixedly connected to the positioning device for radially straightening the annular composite material part from the inside.

[0005] As a preferred embodiment of the above technical solution, the positioning frame includes a first support frame and a second support frame arranged in parallel, and a positioning column for fixing the first support frame and the second support frame. The second support frame has a zero-position support plate arranged in a ring on the side close to the first support frame.

[0006] As a preferred embodiment of the above technical solution, the first support frame and the second support frame adopt the same regular hexagonal frame structure. The first support frame is fixed with a detachable rigid support rod on the side opposite to the second support frame, and the second support frame is fixed with a cross-shaped support frame on the inner side.

[0007] As a preferred embodiment of the above technical solution, the positioning device includes a connecting rod, one end of which is mounted on the flipping mechanism and can be locked onto the flipping mechanism by a locking member, and the other end is fixed with a positioning plate, on which a positioning pin and a clamping device are vertically provided.

[0008] As a preferred embodiment of the above technical solution, the orthopedic device is provided in four sets, which are fixedly connected to the positioning plate through L-shaped connecting plates. The orthopedic device includes a threaded screw, a positioning seat for mounting the threaded screw, and a rotating rocker for adjusting the threaded screw. A locking element two for locking the threaded screw is installed on the positioning seat.

[0009] As a preferred embodiment of the above technical solution, the positioning frame is provided with symmetrical lifting lugs.

[0010] A method for inspecting the surface of a large-size annular composite material part using any one of the above-mentioned auxiliary inspection fixtures, the inspection process of which is as follows: S1, Positioning auxiliary inspection fixture, placed vertically with the axis of the inspection fixture and the support frame at the top, opening all flipping mechanisms and forming an assembly channel for the annular composite material parts. S2, Initial positioning of the annular composite material part: Using an overhead crane, the annular composite material part is initially placed on the part tray of the auxiliary inspection fixture, and the positioning holes on the annular composite material part are adjusted to correspond one-to-one with the positioning device. S3, locking the annular composite material part, locking the annular composite material part onto the auxiliary testing fixture through the cooperation of the positioning device and the straightening device, and at the same time completing the assembly of the detachable rigid support rod of the positioning frame; S4. Adjust the annular composite material part to the inspection position. Using the lifting rings on both sides of the auxiliary inspection fixture, flip the auxiliary inspection fixture with the assembled annular composite material part until the axis of the auxiliary inspection fixture is horizontal.

[0011] As a preferred embodiment of the above technical solution, in step S3, if there is a deviation between the positioning hole on the annular composite material part and the positioning pin of the positioning device after flipping, the annular composite material part is squeezed by the straightening device until the positioning hole on the annular composite material part is aligned with the positioning pin before the positioning pin is inserted.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a hexagonal tooling frame, reinforced with support frames on the front and rear ends to ensure structural rigidity in both orientations, with a maximum deformation ≤0.02mm. Zero-positioning devices are installed on the front and rear ends of the tooling, working in conjunction with a straightening device adjuster to ensure the positioning holes of the part are connected and fixed to the zero-positioning pins of the auxiliary inspection tooling. Simultaneously, a clamping device is added at the connection between the part and the tooling to ensure a fixed relative position after connection. This invention overcomes the difficulty of inspecting the surface of large-sized annular composite material parts in existing technologies, improving inspection efficiency and quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the tooling of the present invention. Figure 1 .

[0014] Figure 2 This is a schematic diagram of the tooling of the present invention. Figure 2 .

[0015] Figure 3 This is a schematic diagram of the structure of the tooling locking and positioning ring-shaped composite material part of the present invention.

[0016] Figure 4 This is a schematic diagram of the positioning device.

[0017] The attached figures are labeled as follows: 1-positioning frame, 2-positioning device, 3-correcting device, 4-ring composite material part, 5-flipping mechanism, 6-support frame one, 7-support frame two, 8-positioning column, 9-zero position plate, 10-detachable rigid support rod, 11-cross-shaped support frame, 12-connecting rod, 13-locking part one, 14-positioning plate, 15-positioning pin, 16-pressure clamp, 17-L-shaped connecting plate, 18-threaded screw, 19-positioning seat, 20-rotating crank, 21-locking part two, 22-lifting lug. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: like Figures 1 to 4The auxiliary inspection fixture for the surface of a large-sized annular composite material part shown includes a positioning frame 1, a positioning device 2 arranged in a ring on the positioning frame 1, and a straightening device 3. The positioning frame 1 encloses an installation area for positioning the annular composite material part 4. The positioning device 2 is installed on one side of the positioning frame 1 through a flipping mechanism 5 for axially pressing the annular composite material part 4. The straightening device 3 is fixedly connected to the positioning device 2 for radially straightening the annular composite material part 4 from the inside.

[0020] In this embodiment, the positioning frame 1 includes a first support frame 6 and a second support frame 7 arranged in parallel, and a positioning column 8 for fixing the first support frame 6 and the second support frame 7. The second support frame 7 has a zero-position support plate 9 arranged in a ring on the side near the first support frame 6.

[0021] In this embodiment, the first support frame 6 and the second support frame 7 adopt the same regular hexagonal frame. The first support frame 6 is fixed with a detachable rigid support rod 10 on the side away from the second support frame 7, and the second support frame 7 is fixed with a cross-shaped support frame 11 on the inner side.

[0022] Specifically, the detachable rigid support rod 10 is connected to the support frame 6 by screws and pins to improve the rigidity of the inspection tooling. The part tray 9 protrudes from the support frame 6 for easy removal of the lifting strap.

[0023] In this embodiment, the positioning device 2 includes a connecting rod 12. One end of the connecting rod 12 is mounted on the flipping mechanism 6 and can be locked to the flipping mechanism 6 by a locking member 13. The other end is fixed with a positioning plate 14. The positioning plate 14 is vertically provided with a positioning pin 15 and a clamping device 16.

[0024] Specifically, the positioning pin 15 is threadedly connected to the positioning plate 14, which serves to lock and limit the outward movement of the annular composite material part 4. The end of the clamping device 16 is made of rubber, which is used to limit the outward movement of the annular composite material part 4 and at the same time provide friction to further constrain the movement of the part in the plane.

[0025] In this embodiment, the orthopedic device 3 is provided in four sets, which are fixedly connected to the positioning plate 14 through the L-shaped connecting plate 17. The orthopedic device 3 includes a threaded screw 18, a positioning seat 19 for mounting the threaded screw 18, and a rotating rocker 20 for adjusting the threaded screw 18. A locking member 21 for locking the threaded screw is installed on the positioning seat 18.

[0026] In this embodiment, the positioning frame 1 is symmetrically provided with lifting lugs 22.

[0027] Specifically, the flipping mechanism 5, locking component 13, and locking component 21 are all existing technologies in this field and will not be described in detail here.

[0028] A method for inspecting the surface of a large-size annular composite material part using any one of the above-mentioned auxiliary inspection fixtures, the inspection process of which is as follows: S1, Positioning auxiliary inspection fixture, placed vertically with the axis of the inspection fixture and the support frame 6 is located above, opening all flipping mechanisms 5 and forming an assembly channel for the annular composite material part 4. S2, Initial positioning of the annular composite material part 4: Using the assistance of an overhead crane, the annular composite material part 4 is initially placed on the part tray 9 of the auxiliary testing fixture, and the positioning holes on the annular composite material part 4 are adjusted to correspond one-to-one with the positioning device 2. S3, lock the annular composite material part 4, and lock the annular composite material part 4 onto the auxiliary testing fixture by cooperating with the positioning device 2 and the straightening device 3, while completing the assembly of the detachable rigid support rod 10 of the positioning frame 1. S4, adjust the annular composite material part 4 to the inspection position, and flip the auxiliary inspection fixture with the annular composite material part 4 assembled on both sides through the lifting rings 22 on both sides of the auxiliary inspection fixture until the axis of the auxiliary inspection fixture is in a horizontal position.

[0029] In this embodiment, in step S3, if there is a deviation between the positioning hole on the annular composite material part 4 and the positioning pin 15 of the positioning device 2 after flipping, the annular composite material part 4 is squeezed by the straightening device 3 until the positioning hole on the annular composite material part 4 is aligned with the positioning pin 15 before the positioning pin 15 is inserted.

[0030] Specifically, the four sets of orthopedic devices 3 are divided into two groups for use, with the two sets of orthopedic devices 3 set up opposite each other forming one group.

[0031] This invention utilizes a hexagonal tooling frame, reinforced with support frames on the front and rear ends to ensure structural rigidity in both orientations, with a maximum deformation ≤0.1mm. Zero-positioning devices are installed on the front and rear ends of the tooling, working in conjunction with a straightening device adjuster to ensure the positioning holes of the part are connected and fixed to the zero-positioning pins of the inspection tooling. Simultaneously, a clamping device is added at the connection between the part and the tooling to ensure a fixed relative position after connection. This invention overcomes the difficulty of inspecting the surface of large-sized annular composite material parts in existing technologies, improving inspection efficiency and quality.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary inspection fixture for the surface of a large-size annular composite material part, characterized in that: The device includes a positioning frame, a positioning device arranged in a ring on the positioning frame, and a straightening device. The positioning frame encloses an installation area for positioning the annular composite material part. The positioning device is mounted on one side of the positioning frame via a flipping mechanism for axially pressing the annular composite material part. The straightening device is fixedly connected to the positioning device for radially straightening the annular composite material part from the inside.

2. The auxiliary inspection fixture for the surface of a large-size annular composite material part according to claim 1, characterized in that: The positioning frame includes a first support frame and a second support frame arranged in parallel, and a positioning column for fixing the first support frame and the second support frame. The second support frame has a zero-position support plate arranged in a ring on the side close to the first support frame.

3. The auxiliary inspection fixture for the surface of a large-size annular composite material part according to claim 2, characterized in that: The support frame one and support frame two adopt the same regular hexagonal frame structure. The support frame one is fixed with a detachable rigid support rod on the side away from the support frame two, and the support frame two is fixed with a cross-shaped support frame on the inner side.

4. The auxiliary inspection fixture for the surface of a large-size annular composite material part according to claim 3, characterized in that: The positioning device includes a connecting rod, one end of which is mounted on the flipping mechanism and can be locked to the flipping mechanism by a locking member, and the other end is fixed with a positioning plate, on which a positioning pin and a clamping device are vertically provided.

5. The auxiliary inspection fixture for the surface of a large-size annular composite material part according to claim 4, characterized in that: The orthopedic device is provided in four sets, which are fixedly connected to the positioning plate through L-shaped connecting plates. The orthopedic device includes a threaded screw, a positioning seat for installing the threaded screw, and a rotating rocker for adjusting the threaded screw. A locking element two for locking the threaded screw is installed on the positioning seat.

6. The auxiliary inspection fixture for the surface of a large-size annular composite material part according to claim 1, characterized in that: The positioning frame is symmetrically equipped with lifting lugs.

7. A method for detecting the surface profile of a large-size annular composite material part using an auxiliary inspection fixture as described in any one of claims 1-6, characterized in that: The testing process is as follows: S1, Positioning auxiliary inspection fixture, placed vertically with the axis of the inspection fixture and the support frame at the top, opening all flipping mechanisms and forming an assembly channel for the annular composite material parts. S2, Initial positioning of the annular composite material part: Using an overhead crane, the annular composite material part is initially placed on the part tray of the auxiliary inspection fixture, and the positioning holes on the annular composite material part are adjusted to correspond one-to-one with the positioning device. S3, locking the annular composite material part, locking the annular composite material part onto the auxiliary testing fixture through the cooperation of the positioning device and the straightening device, and at the same time completing the assembly of the detachable rigid support rod of the positioning frame; S4. Adjust the annular composite material part to the inspection position. Using the lifting rings on both sides of the auxiliary inspection fixture, flip the auxiliary inspection fixture with the assembled annular composite material part until the axis of the auxiliary inspection fixture is horizontal.

8. The detection method according to claim 7, characterized in that: In step S3, if there is a deviation between the positioning hole on the annular composite material part and the positioning pin of the positioning device after flipping, the annular composite material part is squeezed by the straightening device until the positioning hole on the annular composite material part is aligned with the positioning pin before the positioning pin is inserted.

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