A repair tool for OGV bolt hole boring inserts

Abstract

This utility model relates to the field of engine maintenance technology and discloses a tool for repairing OGV bolt hole boring bushings, including: a clamping base for raising the height of the limiting unit and the centering support unit from the bottom; a limiting unit; and a centering support unit including a centering base, a centering arc plate, and a tensioning element. Multiple centering arc plates are circumferentially spaced and integrally formed with the centering base, and the tensioning element controls the opening and closing degree of the centering arc plates. This utility model can perform specific clamping and fixing of OGVs, adopting a fixing method based on two-stage bolt holes to carry out repair work on one-stage bolt holes, meeting repair requirements; it can perfectly avoid repairing thin-walled plate positions, effectively preventing OGV deformation; it not only ensures the positioning accuracy of the OGV but also avoids interference between parts and clamps and controls clamping and cutting forces; the steel bushing insertion speed is faster and more convenient, and the success rate is greatly improved; it fills a gap in related repair operations in China and reduces repair cycles and costs.

Description

Technical Field

[0001] This utility model relates to the field of engine maintenance technology, specifically, it is a repair tool for OGV bolt hole boring inserts. Background Technology

[0002] The OGV (Outlet Guide Vane) is the fan outlet guide vane on the engine. During repair, it was found that the wear at the bolt holes was excessive. This phenomenon is due to the OGV's operating environment; it is subjected to high-speed airflow and vibration for a long time, causing wear due to friction with the steel bolts. According to the foreign repair manual, it can be repaired by machining the worn bolt holes to enlarge them and then inserting steel bushings. However, the manual only provides the repair requirements and does not provide detailed repair methods or specific repair equipment. There is currently no precedent for domestic independent repair. Therefore, when encountering such faulty parts, they can only be taken out of service for repair or sent abroad for repair, which puts pressure on the company's normal maintenance production in terms of time and cost. Utility Model Content

[0003] The purpose of this utility model is to provide a repair tool for OGV bolt hole boring inserts, which solves the problem of difficult repair of worn bolt holes on OGV.

[0004] This utility model is achieved through the following technical solution: an OGV bolt hole boring insert repair tool, comprising: The fixture base has multiple stations for installing limiting units and centering support units, and for raising the limiting units and centering support units from the bottom; the multiple stations are arranged in a circle. The limiting unit is used to press the OGV and axially limit the OGV; The centering support unit is used to center and limit the OGV.

[0005] To better realize this utility model, the centering support unit further includes a centering seat, a centering arc plate, and a tensioning member. Multiple centering arc plates are circumferentially spaced and integrally formed with the centering seat. The tensioning member is used to control the opening and closing degree of the centering arc plates.

[0006] To better realize this utility model, the tensioning component further includes a tensioning rod and a centering nut, and the centering seat is installed on the clamp seat; the tensioning rod is slidably connected to the centering seat, the centering nut is threadedly connected to the tensioning rod, the tensioning rod includes a rod body and a sliding groove, the sliding groove is installed on the rod body, and the sliding groove cooperates with the centering arc plate.

[0007] To better realize this utility model, the tensioning rod further includes a guide rod, which is mounted on the rod body and coaxially arranged with the rod body.

[0008] To better realize this utility model, the centering support unit further includes a pin, and the tensioning rod further includes a tensioning cone arranged axially on the rod body, with the pin inserted into the tensioning cone.

[0009] To better realize this utility model, the limiting unit further includes a pressure plate, an adjusting bolt, and a connecting bolt. The adjusting bolt passes through one end of the pressure plate, the connecting bolt passes through the middle of the pressure plate, the connecting bolt is threaded onto the fixture seat, the adjusting bolt is pressed onto the fixture seat, and the other end of the pressure plate is used to extrude OGV.

[0010] To better realize this utility model, the clamp seat further includes a base, a support rod, and a mounting seat. The support rod is mounted on the base, and the mounting seat is mounted on the support rod. The limiting unit and the centering support unit can be detachably mounted on the mounting seat.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model can perform specific clamping and fixing of OGV, adopts a fixing method based on two bolt holes, and carries out repair work on one bolt hole, which meets the repair requirements, fills the gap in related repair operations in China, and reduces the repair cycle and cost; (2) This utility model provides a special repair tool for the OGV, which has thin-walled mounting platforms at both ends and airfoil-shaped in the middle, which has low strength and is easy to deform. It can perfectly avoid the thin-walled plate position for repair and effectively prevent OGV from deforming. (3) By setting a limiting unit and a centering support unit, this utility model not only ensures the positioning accuracy of the OGV, but also avoids mutual interference between parts and fixtures and controls clamping and cutting forces. (4) By setting a guide rod in conjunction with a hollow punch, the steel bushing can be installed faster and more conveniently, and the success rate can be greatly improved. (5) This utility model allows multiple OGVs to be repaired simultaneously by setting multiple workstations on the fixture seat, thereby improving work efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure and installation location of the OGV assembly.

[0013] Figure 2 This is a cross-sectional view of a structure with one bolt hole and two bolt holes.

[0014] Figure 3 This is a schematic diagram of the repair tool structure.

[0015] Figure 4 A frontal view of the repair tool structure.

[0016] Figure 5 This is a schematic diagram of the limiting unit structure.

[0017] Figure 6 This is a cross-sectional view of the centering support unit structure.

[0018] Figure 7 This is a schematic diagram of the centering support unit structure.

[0019] Figure 8 This is a schematic diagram of the tensioner structure.

[0020] Wherein: 20-Clamping seat; 30-Limiting unit; 40-Centering support unit; 101-OGV; 102-Bolt hole; 1021-First stage bolt hole; 1022-Second stage bolt hole; 103-Sealing ring; 104-Mounting bolt; 105-Gasket; 106-Steel bushing; 201-Base; 202-Support rod; 203-Mounting seat; 301-Pressure plate; 302-Adjusting bolt; 303-Connecting bolt; 401-Centering seat; 402-Centering arc plate; 403-Tensioning rod; 4031-Rod body; 4032-Tensioning cone; 4033-Slide groove; 4034-Guide rod; 404-Pin rod; 405-Centering nut. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 , 2As shown, the OGV assembly is mounted on the engine fan frame in a circular, evenly distributed arrangement. Each OGV is fixed to the fan frame by two mounting bolts 104 and a sealing ring 103. The bolt holes 102 on the OGV101 are divided into a first bolt hole 1021 and a second bolt hole 1022. In actual maintenance work, it was found that the second bolt hole 1022 did not show obvious wear. Since the first bolt hole 1021 and the second bolt hole 1022 have concentricity requirements, this solution uses the second bolt hole 1022 as the reference for maintenance.

[0024] Example 1: This embodiment provides a repair tool for OGV bolt hole boring inserts, specifically as follows: Figures 3-8 As shown, it includes: The fixture base 20 is provided with multiple workstations for installing the limiting unit 30 and the centering support unit 40, and for raising the limiting unit 30 and the centering support unit 40 from the bottom. The multiple workstations are arranged in a circle. The multiple workstations allow multiple OGV101 to be repaired at the same time, improving work efficiency. The limiting unit 30 is used to press OGV101 and axially limit OGV101; A centering support unit 40 is used to center and limit the OGV101. The centering support unit 40 includes a centering seat 401, a centering arc plate 402, and a tensioning member. The shape of one side of the centering seat 401 matches the arc surface of the OGV101. A plurality of centering arc plates 402 are circumferentially spaced and integrally formed with the centering seat 401, and are elastic. The tensioning member is used to control the opening and closing degree of the centering arc plates 402.

[0025] Furthermore, the tensioning component includes a tensioning rod 403 and a centering nut 405, and the centering seat 401 is mounted on the clamp seat 20; the tensioning rod 403 is slidably connected to the centering seat 401, and the centering nut 405 is threadedly connected to the tensioning rod 403; the tensioning rod 403 includes a rod body 4031 and a sliding groove 4033, the sliding groove 4033 is mounted on the rod body 4031, and the sliding groove 4033 cooperates with the centering arc plate 402.

[0026] Example 2: This embodiment further extends the above embodiment, specifically as follows: Figure 8 As shown, the tensioning rod 403 further includes a guide rod 4034, which is mounted on the rod body 4031 and coaxially arranged with the rod body 4031. The clearance between the guide rod 4034 and the steel bushing 106 is 0.1 mm.

[0027] In practice, the installation of the steel bushing 106 was found to be quite difficult. This is because the steel bushing 106 is too small; after being removed from the liquid nitrogen tank, it can only be handled with tweezers. Adjusting its position on the OGV is inconvenient, requiring a guiding device to assist in its successful installation. Furthermore, since the steel bushing 106 has a tight fit with a section of bolt holes 1021, the limiting unit must be installed within 30 seconds of the steel bushing 106 being removed from the liquid nitrogen tank; otherwise, installation failure is likely. The shape of the OGV itself is also unsuitable for manual clamping and needs to be fixed at the operating position. Therefore, a guide rod 4034 was designed to guide the steel bushing 106, allowing it to better fit into the section of bolt holes 1021.

[0028] Furthermore, the centering support unit 40 also includes a pin 404, and the tensioning rod 403 also includes a tensioning cone 4032 axially disposed on the rod body 4031, with the pin 404 inserted into the tensioning cone 4032.

[0029] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0030] Example 3: This embodiment further extends the above embodiment, specifically as follows: Figure 4 , Figure 5 As shown, the limiting unit 30 includes a pressure plate 301, an adjusting bolt 302, and a connecting bolt 303. The adjusting bolt 302 passes through one end of the pressure plate 301 and is equipped with a nut. The connecting bolt 303 passes through the middle of the pressure plate 301 and is threadedly connected to the clamp seat 20. The adjusting bolt 302 presses on the clamp seat 20. By rotating the connecting bolt 303 and the nut on the adjusting bolt 302, the other end of the pressure plate 301 is pressed against the OGV101.

[0031] Furthermore, the fixture base 20 includes a base 201, a support rod 202, and a mounting base 203. The support rod 202 is mounted on the base 201, and the mounting base 203 is mounted on the support rod 202. The limiting unit 30 and the centering support unit 40 are both detachably mounted on the mounting base 203. The base 201 is placed in the machining center, and the support rod 202 supports the mounting base 203, ensuring that the OGV101 does not interfere with the machining center after placement.

[0032] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0033] Example 4: This embodiment provides a method for repairing OGV bolt hole boring inserts based on the above embodiments, including the following steps: Step S1: Disassemble the OGV assembly, set aside the unrelated sealing ring 103, mounting bolt 104, and gasket 105, and remove OGV101 separately. Step S2: Mount the OGV101 onto the repair tool; Step S3: Repair a section of bolt hole 1021 using the cutting tool of the machining center; Step S4: Install the steel bushing 106 into the repaired section of bolt hole 1021, and then complete the assembly of the OGV assembly.

[0034] Furthermore, the specific steps for clamping the OGV101 in step S2 are as follows: Step S21: Place the two bolt holes 1022 of the OGV101 in either the forward or reverse direction on the centering support unit 40; Step S22: Adjust the centering support unit 40 to center and support the two bolt holes 1022; Step S23: Adjust the limiting unit 30 to press the OGV101 tightly and achieve axial limiting.

[0035] You can repair the forward bolt hole 1021 of OGV101 first, or you can repair the reverse bolt hole 1021 of OGV101 first. The order is not limited. You only need to repair both the forward and reverse bolt holes 1021.

[0036] Furthermore, the specific steps for centering and supporting the two bolt holes 1022 in step S22 are as follows: Step S221: Insert the centering arc plate 402 into the two-section bolt hole 1022; Step S222: Twist the centering nut 405 to drive the tension rod 403 to move downward; thereby causing the slide groove 4033 to expand and squeeze the multiple centering arc plates 402, at which time the centering arc plates 402 can complete the centering clamping of the two bolt holes 1022.

[0037] Furthermore, the specific steps for installing the steel bushing 106 in a bolt hole 1021 in step S4 are as follows: Step S41: Place the steel bushing 106 in liquid nitrogen for cooling; Step S42: Fit the cooled steel bushing 106 onto the guide rod 4034; Step S43: Use a hollow punch to press down on the steel bushing 106 so that it is embedded in a bolt hole 1021. The hole in the hollow punch allows the guide rod 4034 to be inserted, but it can press down on the steel bushing 106.

[0038] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A repair tool for OGV bolt hole boring inserts, characterized in that, include: The fixture base (20) is provided with multiple workstations for installing the limiting unit (30) and the centering support unit (40), and raising the limiting unit (30) and the centering support unit (40) from the bottom; the multiple workstations are arranged in a circle; The limiting unit (30) is used to press the OGV (101) and axially limit the OGV (101); Centering support unit (40) is used to center and limit the OGV (101).

2. The OGV bolt hole boring insert repair tool according to claim 1, characterized in that: The centering support unit (40) includes a centering seat (401), a centering arc plate (402), and a tensioning member. Multiple centering arc plates (402) are circumferentially spaced and integrally formed with the centering seat (401). The tensioning member is used to control the opening and closing degree of the centering arc plates (402).

3. The OGV bolt hole boring insert repair tool according to claim 2, characterized in that: The tensioning component includes a tensioning rod (403) and a centering nut (405). The centering seat (401) is mounted on the clamp seat (20). The tensioning rod (403) is slidably connected to the centering seat (401). The centering nut (405) is threadedly connected to the tensioning rod (403). The tensioning rod (403) includes a rod body (4031) and a sliding groove (4033). The sliding groove (4033) is mounted on the rod body (4031) and cooperates with the centering arc plate (402).

4. The OGV bolt hole boring insert repair tool according to claim 3, characterized in that: The tensioning rod (403) also includes a guide rod (4034), which is mounted on the rod body (4031) and coaxially arranged with the rod body (4031).

5. The OGV bolt hole boring insert repair tool according to claim 3, characterized in that: The centering support unit (40) also includes a pin (404), and the tensioning rod (403) also includes a tensioning cone (4032) arranged axially on the rod body (4031), and the pin (404) is inserted into the tensioning cone (4032).

6. A repair tool for OGV bolt hole boring inserts according to any one of claims 1-5, characterized in that: The limiting unit (30) includes a pressure plate (301), an adjusting bolt (302), and a connecting bolt (303). The adjusting bolt (302) passes through one end of the pressure plate (301), and the connecting bolt (303) passes through the middle of the pressure plate (301). The connecting bolt (303) is threaded onto the clamp seat (20). The adjusting bolt (302) presses on the clamp seat (20), and the other end of the pressure plate (301) is used to compress the OGV (101).

7. The OGV bolt hole boring insert repair tool according to claim 6, characterized in that: The clamp base (20) includes a base (201), a support rod (202), and a mounting base (203). The support rod (202) is mounted on the base (201), and the mounting base (203) is mounted on the support rod (202). The limiting unit (30) and the centering support unit (40) can be detachably mounted on the mounting base (203).

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