Aero-engine rear cover flange welding control device

Abstract

This utility model provides a shape control fixture for welding a rear outer flange of an aero-engine. The rear outer flange is a thin-walled hollow frustum component of titanium alloy, with a flange rolled onto its sidewall. The shape control fixture is installed on the rear outer flange to prevent deformation during flange welding repair. The fixture includes an upper arc plate, a protective component, a lower arc plate, and a column component. The upper arc plate, column component, and lower arc plate form an arc-shaped "I" component to fix the shape of the rear outer flange and prevent deformation caused by high temperatures during flange welding repair. The shape control fixture designed in this embodiment can accurately locate the flange crack welding repair area and improve the overall rigidity of the thin-walled rear outer flange component. It can ensure that the welding repair area always remains within the dimensional and positional tolerances required by the design drawings, achieving shape control while welding and repairing large thin-walled products, and ensuring the repair quality and progress of large thin-walled products.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling technology, specifically relating to a welding shape control tooling for the rear outer flange of an aero-engine. Background Technology

[0002] The rear casing is a crucial component of the outer bypass duct of an aero-engine, serving to ensure the geometry of the flow field within the bypass duct and enhance engine thrust. The rear casing is made of thin-walled titanium alloy sheet with a maximum thickness of 1.5mm. Its structure features a curved, arc-shaped surface with a maximum outer diameter of 1.5m, making it a typical thin-walled curved surface structure. Flanges are rolled onto the surface of the rear casing for connection to other components.

[0003] During use, some engine rear covers develop cracks in their flanges due to aerodynamic and vibrational factors. To ensure product safety and assembly requirements, these cracks need to be repaired by welding. However, because titanium alloys have low thermal conductivity and insufficient structural rigidity, excessive temperature gradients during welding can cause thermal stress exceeding the material's critical instability stress. This leads to deformation and dents in the repaired product under cooling and solidification shrinkage, ultimately affecting subsequent engine assembly. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that the rear outer cover will deform when welding and repairing the flange on the defective rear outer cover, and to provide a welding shape control tool for the flange of the rear outer cover of an aero-engine.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A welding shape control fixture for the rear outer flange of an aero-engine is provided. The rear outer flange is a thin-walled hollow frustum component made of titanium alloy, with a flange rolled onto its sidewall. The bottom of the flange includes a base plate and a connecting cylinder connecting the base plate to the interior of the rear outer flange. The base plate has flange through holes. The shape control fixture is used to prevent deformation of the rear outer flange during flange welding repair. The shape control fixture includes an upper edge arc plate, a protective component, a lower edge arc plate, and a connecting component. The upper edge arc plate has multiple first through holes that correspond one-to-one with the mounting holes at the upper end of the rear outer flange. The upper edge arc plate is installed at the upper end of the rear outer flange through the first through holes. The protective component includes a fixing plate and a connecting plate that match the flange. The fixing plate is installed on the outer surface of the flange, and the connecting plate is installed on the inner surface of the flange. The fixing plate has corresponding flange through holes. The first through hole is provided on the connecting plate, and the second through hole is provided on the connecting plate, which corresponds to the flange through hole. The lower edge arc plate is provided with multiple second through holes, which correspond one-to-one with the mounting holes at the lower end of the rear cover. The lower edge arc plate is installed at the lower end of the rear cover through the second through holes. The connecting assembly includes a connecting column, connecting bolts, and nuts. The length of the connecting column is the same as the height of the rear cover. The upper end is fixedly connected to the upper edge arc plate, the lower end is fixedly connected to the lower edge arc plate, and the middle part is provided with a third through hole, which corresponds one-to-one with the flange through hole. The connecting bolts pass through the third through hole, the connecting plate, the base plate, and the fixing plate in sequence and are locked with nuts. The upper edge arc plate, the connecting assembly, and the lower edge arc plate form an arc-shaped "I" component, which is used to fix the shape of the rear cover and prevent the rear cover from deforming due to the high temperature generated during welding and repairing the flange.

[0007] Furthermore, the protective assembly also includes a vent pipe for introducing argon gas, and an annular groove is provided on the edge of the connecting plate near the flange, the annular groove being connected to the vent pipe.

[0008] Furthermore, the shape of the fixing plate and the connecting plate matches the flange; the base plate has multiple flange mounting holes arranged around the flange through hole, the fixing plate has a fourth through hole, and the connecting plate has a fifth through hole, both of which correspond one-to-one with the flange mounting holes; the fixing plate and the connecting plate are connected to both sides of the base plate by fixing bolts.

[0009] Furthermore, both the upper and lower arc plates have arc-shaped grooves on the side edges facing the connecting components, and the curvature of the arc-shaped grooves matches the curvature of the rear cover.

[0010] Furthermore, the base plate is parallel to the central axis of the rear outer cover, and the connecting column is parallel to the central axis of the rear outer cover.

[0011] Furthermore, both the upper and lower arc plates have rectangular grooves in the middle of the side facing the connecting component, and the two rectangular grooves match the upper and lower ends of the connecting component, respectively.

[0012] Furthermore, a first connecting hole is provided in the rectangular groove, and a second connecting hole matching the first connecting hole is provided at the upper and lower ends of the connecting post.

[0013] Furthermore, the connecting column is welded together from two square steel bars and four mounting plates, with the four mounting plates welded to the upper and lower ends of the two square steel bars respectively.

[0014] Furthermore, thickened plates are installed on both the side of the connecting post closest to the protective component and the side away from the protective component.

[0015] Furthermore, a third connection hole is provided on the upper edge arc plate for the ventilation pipe to pass through.

[0016] The advantages of this utility model are:

[0017] The shape-controlling fixture designed in this utility model connects the upper and lower arc plates through a column assembly, forming an arc-shaped "I" component. The upper arc plate is installed on the upper end of the rear outer cover, and the lower arc plate is installed on the lower end of the rear outer cover. This arc-shaped "I" component supports the rear outer cover, ensuring its rigidity. During welding repairs of the flange, the high temperatures generated will cause contraction forces after cooling and solidification. Due to the action of the arc-shaped "I" component, the shape of the rear outer cover on one side of the flange is supported and maintained, preventing the rear outer cover from deforming under the contraction force. The rear cover, supported by protective components installed on the outer and inner surfaces of the flange, is fixedly connected to the arc-shaped "I"-shaped components to restrict the flange's degree of freedom. This maintains the shape of the rear cover before welding repair, ensuring the welding area remains within the required dimensional and positional tolerances of the design drawings. The shrinkage force generated during welding repair is less than the support force provided by the shape control fixture, preventing deformation or denting of the rear cover during welding repair, or causing only minor deformation that still meets usage requirements. Attached Figure Description

[0018] The features and advantages of this invention will become more readily understood from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0019] Figure 1 This is an exploded view of the structure of the shape control tooling of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the rear outer cover of this utility model;

[0021] Figure 3 This is an assembly diagram of the shape control tooling of this utility model on the rear outer cover;

[0022] Figure 4 This is a schematic diagram of the structure of the protective component of this utility model;

[0023] Figure 5This is a structural schematic diagram of the column assembly of this utility model;

[0024] Figure 6 This is a schematic diagram of the lower edge arc plate of this utility model;

[0025] In the diagram: 1-Upper edge arc plate; 2-Protective component; 21-Fixing plate; 211-First through hole; 212-Fourth through hole; 22-Connecting plate; 221-Second through hole; 222-Fifth through hole; 23-Ventilation pipe; 3-Connecting component; 31-Thickened plate; 32-Square steel; 33-Mounting plate; 4-Lower edge arc plate; 5-Connecting bolt; 6-Fixing nut; 7-Rear cover; 71-Flange. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0027] The rear outer casing 7 of the aero-engine's outer bypass duct is made of thin-walled titanium alloy sheet with a maximum thickness of 1.5 mm. It has a curved, arc-shaped structure with a maximum outer diameter of 1.5 mm. A flange 71 is roll-welded onto the outer surface of the rear outer casing 7 for connection to other components. The flange includes a base plate and a connecting cylinder connecting the base plate to the interior of the rear outer casing. The base plate has flange through holes. To address the problem of deformation of the rear outer casing 7 during welding repairs to the flange 71, this embodiment provides a welding shape control fixture for the aero-engine rear outer casing flange.

[0028] like Figure 1 As shown, the shape control fixture is used to prevent the rear outer cover 7 from deforming when welding and repairing the flange 71. The shape control fixture includes an upper edge arc plate 1, a protective component 2, a lower edge arc plate 4, and a connecting component 3.

[0029] like Figure 1 , 3 As shown, the upper edge arc plate 1 is provided with a plurality of first through holes that correspond one-to-one with the mounting holes on the upper end of the rear outer cover 7. The upper edge arc plate 1 is installed on the upper end of the rear outer cover 7 through the first through holes.

[0030] like Figure 1 , 2 As shown in Figure 3, the protection component 2 includes a fixing plate 21 and a connecting plate 22 that match the flange 71. The fixing plate 21 is installed on the outer surface of the flange 71, and the connecting plate 22 is installed on the inner surface of the flange 71. The fixing plate 21 is provided with a first through hole 211 corresponding to the flange through hole, and the connecting plate is provided with a second through hole 221 corresponding to the flange through hole.

[0031] like Figure 1 , 6As shown, the lower edge arc plate 4 is provided with a plurality of second through holes that correspond one-to-one with the mounting holes at the lower end of the rear outer cover 7. The lower edge arc plate 4 is installed at the lower end of the rear outer cover 7 through the second through holes.

[0032] like Figure 1 , 5 As shown in Figure 6, the connecting assembly 3 includes a connecting column, connecting bolts 5, and nuts. The length of the connecting column is the same as the height of the rear outer cover 7. The upper end of the connecting column is fixedly connected to the upper edge arc plate 1, and the lower end of the connecting column is fixedly connected to the lower edge arc plate 4. The middle of the connecting column is provided with a third through hole corresponding to the flange through hole. The fixing bolts 5 pass through the connecting assembly 3, the second through hole 221, the flange 71, and the first through hole 211 in sequence, and are connected to the fixing nuts 6 to install the protective assembly 2 at the flange 71 and fix it on the connecting assembly 3, thus restricting the degree of freedom of the flange 71. Among them, the upper edge arc plate 1, the connecting assembly 3, and the lower edge arc plate 4 form an arc-shaped "I" component, which is used to fix the shape of the rear outer cover 7 and prevent the high temperature generated during welding repair of the flange 71 from deforming the rear outer cover 7.

[0033] The shape control fixture provided in this implementation accurately positions the weld repair area of ​​the cracked flange 71 and improves the overall rigidity of the thin-walled rear cover 7. This ensures that the weld repair area remains within the dimensional and positional tolerances required by the design drawings, enabling shape control during the welding repair of large thin-walled products and guaranteeing the repair quality and schedule. Specifically, the outer edges of the upper arc plate 1 and the lower arc plate 4 are matched with the curvature of the rear cover 7. Multiple first mounting holes on the upper edge arc plate 1 correspond one-to-one with multiple mounting holes on the upper end of the rear outer cover 7, allowing the upper edge arc plate 1 to be installed on the upper end of the rear outer cover 7 and maintaining the shape of the upper end of the rear outer cover 7. Multiple second mounting holes on the lower edge arc plate 4 correspond one-to-one with multiple mounting holes on the lower end of the rear outer cover 7, allowing the lower edge arc plate 4 to be installed on the lower end of the rear outer cover 7 and maintaining the shape of the lower end of the rear outer cover 7. Then, the upper edge arc plate 1 and the lower edge arc plate 4 are connected by the connecting assembly 3 to form an arc-shaped "I"-shaped assembly. This assembly supports the rear outer cover 7, ensuring its rigidity. The high temperature generated during welding repairs to the flange 71, after cooling and solidification, produces shrinkage force. Due to the action of the arc-shaped "I"-shaped assembly, this force is supported and maintained. The shape of the rear outer cover 7 on one side of the flange 71 prevents the rear outer cover 7 from deforming under the action of shrinkage force. The deformation problem around the welding repair area is also reduced by the arc-shaped "I" component. The protective component 2 installed on the outer and inner surfaces of the flange 71 can support the rear outer cover 7 around the flange 71. The protective component 2 and the arc-shaped "I" component are fixedly connected together to restrict the degree of freedom of the flange 71. The shape of the rear outer cover 7 is maintained before welding repair, so that the welding repair area always stays within the required dimensional and positional tolerances of the design drawings. The shrinkage force generated during welding repair is less than the support force provided by the shape control tooling, so that the rear outer cover 7 can not deform or dent during welding repair, or produce very small deformation, but still meet the usage requirements.

[0034] like Figure 4 As shown, the protection component 2 also includes a vent pipe 23 for introducing argon gas, such as... Figure 1 As shown, the upper arc plate 1 is provided with a third connecting hole for the vent pipe 23 to pass through. The connecting plate 22 has an annular groove on the edge near the flange 71, and the annular groove communicates with the vent pipe 23. During welding repair, argon gas is introduced through the vent pipe 23, allowing the argon gas to enter the annular groove, thus forming a protective atmosphere when welding the crack in the flange 71, which can further reduce welding deformation problems.

[0035] like Figure 3 , 4As shown, the shape of the fixing plate 21 and the connecting plate 22 matches that of the flange 71, and can support the rear cover 7 at the column flange 71, so that the shape at this point is kept within the form and position tolerance required by the design drawings; the base plate is provided with multiple flange mounting holes, which are arranged around the flange through holes. The fixing plate 21 is provided with a fourth through hole 212, and the connecting plate 22 is provided with a fifth through hole 222. The fourth through hole 212 and the fifth through hole 222 correspond one-to-one with the flange mounting holes. The fixing plate 21 and the connecting plate 22 are connected to both sides of the base plate by fixing bolts 5.

[0036] In another possible embodiment, for the sake of a lightweight structure, the diameter of the first through hole 211 is smaller than the diameter of the flange through hole, and for the sake of increased rigidity, the diameter of the second through hole 221 is equal to the diameter of the flange through hole. The connecting bolts 5 are also designed in a stepped shape according to the size of the first through hole 211 and the second through hole 221 to fix the protective component 2 on the flange 71 and the connecting component 3.

[0037] like Figure 1 , 6 As shown, both the upper arc plate 1 and the lower arc plate 4 have arc-shaped grooves on their edges facing the connecting assembly 3, and the curvature of the arc-shaped grooves matches the curvature of the rear cover 7. This allows for quick alignment of the first and second through holes with the mounting holes on the rear cover 7, enabling the upper arc plate 1 and the lower arc plate 4 to be quickly assembled onto the upper and lower ends of the rear cover 7.

[0038] The base plate is parallel to the central axis of the rear outer cover 7, and the connecting column is also parallel to the central axis of the rear outer cover 7. This allows the flange 71 to be in a numerical state, making it easier to connect with other components. The shaping fixture can be parallel to the base plate of the flange 71, allowing for better shaping of the flange 71 and the rear outer cover 7.

[0039] like Figure 1 , 6 As shown, both the upper arc plate 1 and the lower arc plate 4 have rectangular grooves in the middle of their sides facing the connecting component 3. The two rectangular grooves match the upper and lower ends of the connecting component 3, respectively. The rectangular grooves engage with the two ends of the connecting component 3 to achieve quick positioning and ensure the stability of the assembly of the upper arc plate 1, the lower arc plate 4, and the connecting component 3.

[0040] like Figure 6As shown, a first connecting hole is provided in the rectangular groove, and a second connecting hole matching the first connecting hole is provided at the upper and lower ends of the connecting post. The upper and lower ends of the connecting component 3 are respectively inserted into the rectangular grooves of the upper edge arc plate 1 and the lower edge arc plate 4, achieving quick positioning of the connecting component 3 through the rectangular grooves, and aligning the first and second connecting holes. The first and second connecting holes are connected by screws, completing the rapid assembly of the upper edge arc plate 1, the lower edge arc plate 4, and the connecting component 3. In this embodiment, the first and second connecting holes are threaded holes.

[0041] like Figure 5 As shown, the connecting column includes two square steel bars 32 and four mounting plates 33, which are respectively welded to the upper and lower ends of the two square steel bars 32. The mounting plates 33 are provided with M6 threaded holes, and the protective component 2 is connected to the upper edge arc plate 1 and the lower edge arc plate 4 through the mounting plates 33.

[0042] Thickened plates 31 are installed on both the side of the connecting column closest to the protective component 2 and the side away from the protective component 2. To increase the rigidity of the protective component 2, the square steel 32 and the thickened plates 31 are provided with third through holes that correspond one-to-one with the through holes on the flange 71.

[0043] This embodiment also provides a specific dimension for reference:

[0044] Both the upper arc plate 1 and the lower arc plate 4 are made of steel plates with a thickness of 15mm. The first through hole and the second through hole are both φ6mm round holes. The fixing plate 21 and the connecting plate 22 are provided with φ6mm round holes that correspond one-to-one with the mounting hole positions of the flange 71. The diameter of the first through hole 211 on the fixing plate 21 is φ12mm, and the diameter of the second through hole 221 on the connecting plate 22 is φ24mm. The connecting column is composed of a 15mm thick square steel 32 and four 15mm thick mounting plates 33. The thickness of the thickened plate 31 is 16mm, the diameter of the third through hole is φ24mm, and the diameter of the third connecting hole provided on the upper arc plate 1 is φ12mm.

[0045] The above-mentioned shape control fixture usage method:

[0046] (1) Use 4 M6 bolts to assemble the upper edge arc plate 1 and the lower edge arc plate 4 to the mounting plate 33 of the connecting component 3 to form an "I" shaped component;

[0047] (2) Place the fixing plate 21 in the protective assembly 2 on the outer surface of the flange 71 and the connecting plate 22 on the inner surface of the flange 71. Then, align the fourth through hole 212 and the fifth through hole 222 with the flange mounting holes one by one. Then, use 20 M6 bolts to assemble the fixing plate 21 and the connecting plate 22 onto the flange 71 on the rear outer cover 7.

[0048] (3) Place the half of the rear cover 7 to be welded into the "I" shaped assembly, so that the upper and lower edges of the rear cover 7 are inserted into the arc grooves designed by the upper arc plate 1 and the lower arc plate 4, and make the mounting holes of the rear cover 7 correspond one-to-one with the first through hole of the upper arc plate 1 and the second through hole of the lower arc plate 4. Then use 24 M6 bolts to fix the rear cover 7 to the "I" shaped assembly.

[0049] (4) Pass one end of the vent pipe 23 through the third mounting hole of the upper edge arc plate 1 and connect it to the annular groove of the connecting plate 22;

[0050] (5) Pass the connecting bolts 5 through the third through hole on the connecting assembly 3, the second through hole 221 on the connecting plate 22, the flange through hole on the flange 71, and the first through hole 211 on the fixing plate 21 in sequence from the inside to the outside. Then, tighten the fixing nuts 6. At this time, the assembly of the outer cover 7 to be welded and repaired and the shape control fixture is completed.

[0051] (6) During the welding repair, after connecting the argon gas pipe to the ventilation pipe 23, the crack in the flange 71 was repaired by welding using a high-frequency argon arc welding machine. Through actual repair measurement and inspection, it was found that there was no deformation or dent in the welding area.

[0052] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered as included within the protection scope of the present invention.

Claims

1. A welding shape control fixture for a rear outer casing flange of an aircraft engine, wherein the rear outer casing (7) is a thin-walled hollow frustum component of titanium alloy, and a flange (71) is roll-welded onto its side wall, the flange (71) including a base plate and a connecting cylinder connecting the base plate to the interior of the rear outer casing, the base plate being provided with a flange through hole, the shape control fixture being used to prevent deformation of the rear outer casing (7) during welding repair of the flange (71), characterized in that, The shape control fixture includes: Upper edge arc plate (1), the upper edge arc plate (1) is provided with a plurality of first through holes corresponding one-to-one with the mounting holes at the upper end of the rear outer cover (7), the upper edge arc plate (1) is installed at the upper end of the rear outer cover (7) through the first through holes; The protective component (2) includes a fixing plate (21) and a connecting plate (22) that match the flange (71). The fixing plate (21) is installed on the outer surface of the flange (71), and the connecting plate (22) is installed on the inner surface of the flange (71). The fixing plate (21) is provided with a first through hole (211) corresponding to the flange through hole, and the connecting plate (22) is provided with a second through hole (221) corresponding to the flange through hole. The lower edge arc plate (4) is provided with a plurality of second through holes corresponding one-to-one with the mounting holes at the lower end of the rear outer cover (7). The lower edge arc plate (4) is installed at the lower end of the rear outer cover (7) through the second through holes. The connecting component (3) includes a connecting column, a connecting bolt (5), and a nut; the length of the connecting column is consistent with the height of the rear outer cover (7), the upper end is fixedly connected to the upper edge arc plate (1), the lower end is fixedly connected to the lower edge arc plate (4), and a third through hole is provided in the middle corresponding to the flange through hole. The connecting bolt (5) passes through the third through hole, the connecting plate, the bottom plate and the fixing plate in sequence, and is locked by the nut. The upper arc plate (1), the connecting component (3) and the lower arc plate (4) form an arc-shaped "I" component, which is used to fix the shape of the rear cover (7) and prevent the rear cover (7) from deforming due to high temperature generated during welding repair of the flange (71).

2. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1, characterized in that, The protective component (2) also includes a vent pipe (23) for introducing argon gas. The connecting plate (22) has an annular groove on the edge near the flange (71), and the annular groove is connected to the vent pipe (23).

3. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, The shapes of the fixing plate (21) and the connecting plate (22) match those of the flange (71); The base plate is provided with a plurality of flange mounting holes, which are arranged around the flange through hole. The fixing plate (21) is provided with a fourth through hole (212), and the connecting plate (22) is provided with a fifth through hole (222). The fourth through hole (212) and the fifth through hole (222) correspond one-to-one with the flange mounting holes. The fixed plate (21) and the connecting plate (22) are connected to both sides of the base plate by fixing bolts (5).

4. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, Both the upper edge arc plate (1) and the lower edge arc plate (4) have arc-shaped grooves on one side of the connecting assembly (3), and the curvature of the arc-shaped grooves matches the curvature of the rear outer cover (7).

5. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, The base plate is parallel to the central axis of the rear outer cover (7), and the connecting column is parallel to the central axis of the rear outer cover (7).

6. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, Both the upper edge arc plate (1) and the lower edge arc plate (4) have rectangular grooves in the middle of one side facing the connecting component (3), and the two rectangular grooves are respectively matched with the upper end and the lower end of the connecting component (3).

7. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 6, characterized in that, The rectangular groove is provided with a first connecting hole, and the upper and lower ends of the connecting post are respectively provided with second connecting holes that match the first connecting hole.

8. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, The connecting column includes two square steel bars (32) and four mounting plates (33), which are respectively welded to the upper and lower ends of the two square steel bars (32).

9. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 1 or 2, characterized in that, Thickened plates (31) are installed on both the side of the connecting post closest to the protective component (2) and the side away from the protective component (2).

10. The welding shape control fixture for the rear outer flange of an aero-engine according to claim 2, characterized in that, The upper edge arc plate (1) is provided with a third connecting hole for the vent pipe (23) to pass through.

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