Welding fixture and welding method for aero-engine flame tube head assembly

Abstract

The application discloses an aero-engine flame tube head assembly welding clamp and a welding method, which comprise a supporting assembly, an outer pressing assembly, a positioning assembly, an inner pressing assembly and an adjusting piece. The outer pressing assembly is arranged on the supporting assembly. The positioning assembly comprises a positioning bottom plate and a positioning cone. The positioning bottom plate is inserted and matched with the supporting assembly along the vertical direction and forms a reference surface arranged along the horizontal direction. The outer wall surface of the positioning cone is used for profiling the inner cone of the flame tube head to support the guide plate, so that the guide plate is positioned in cooperation with the flame tube head. The inner pressing assembly is used for tightly fixing the guide plate. The adjusting piece is used for adjusting the gap between two adjacent guide plates. Compared with the prior art, the scheme realizes one-time clamping and welding of multiple guide plates, the consistency of the flame tube head assembly is good, the welding efficiency is high, the key size of the flame tube head assembly can be ensured to be qualified during welding assembly, and the welding difficulty is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding equipment, in particular, relates to an aero-engine flame tube head assembly welding fixture. In addition, the present application also relates to an aero-engine flame tube head assembly welding method using the aero-engine flame tube head assembly welding fixture. BACKGROUND

[0002] The flame tube head assembly is an important hot end part of the aero-engine combustion chamber. The main body of the part is annular structure, and needs to be welded with multiple guide plates along the circumferential direction by argon arc welding. Each guide plate is spot-welded with four sections along the circumferential direction of the welding position. During the welding process, the key dimension A and the key dimension L need to be qualified. The dimension A is the distance between the guide plate and the inner cone of the flame tube head, and the dimension L is the circumferential gap between the adjacent two guide plates.

[0003] Since the welding point of the guide plate is located on the outer circle of the cone of the flame tube head, but there are two reverse flange edges on the cone part, the welding space is small, and the welding is difficult. In addition, the multiple guide plates are uniformly distributed on the inner conical surface of the flame tube head, and need to keep the gap uniform. If the one-by-one assembly welding method is used, the fixture structure is relatively simple, but the welding efficiency is low, and each welding cannot be coordinated with each other. After one-by-one welding, it is easy to have a large cumulative error, the dimension L is unqualified, and the risk of part scrap is high. In addition, after the guide plate and the flame head assembly, the two form a double-layer closed cavity structure, and the dimension A is located in the cavity. Therefore, if the dimension A is not qualified during the welding of the part, it is difficult to confirm that the dimension A is qualified after the welding is completed. SUMMARY

[0004] The present application provides an aero-engine flame tube head assembly welding fixture and welding method to solve the technical problems that the existing flame tube head assembly is difficult to ensure the key dimension qualified during welding assembly, and the welding is difficult.

[0005] According to one aspect of the present application, there is provided an aero-engine flame tube head assembly welding fixture, comprising a support assembly, an outer pressing assembly, a positioning assembly, an inner pressing assembly and an adjusting member, the support assembly is used for supporting the flame tube head from the bottom, the outer pressing assembly is arranged on the support assembly and is used for cooperating with the support assembly to press and fix the flame tube head, the positioning assembly comprises a positioning base plate and a positioning cone, the positioning base plate is inserted and matched with the support assembly in the vertical direction and forms a reference surface arranged in the horizontal direction, the outer wall surface of the positioning cone is used for profiling the inner cone of the flame tube head to support the guide vane, thereby cooperating with the flame tube head to position the guide vane, the inner pressing assembly is used for penetrating the positioning cone, the guide vane and the flame tube head to apply a pressing force to the positioning cone close to the flame tube head, thereby pressing and fixing the guide vane, and the adjusting member is inserted and matched with the positioning cone and is clamped between the adjacent two guide vanes to adjust the gap between the adjacent two guide vanes.

[0006] As a further improvement of the above technical solution:

[0007] Further, the support assembly comprises a support base plate and a plurality of support members, the outer pressing assembly is arranged on the support base plate, the positioning base plate and the support base plate are inserted and matched, and the plurality of support members are arranged on the support base plate in the circumferential direction of the support base plate and are arranged in a staggered manner with the inner pressing assembly in the circumferential direction, and the plurality of support members are used for supporting the flame tube head from the bottom.

[0008] Further, the insertion and matching tolerance of the positioning base plate and the support base plate is H7 / g6.

[0009] Further, an installation portion extending outward in the radial direction is formed on the outer annular wall of the support base plate, a support hole is formed on the installation portion, the support member comprises a support column arranged on the support hole in the vertical direction and a connecting screw penetrating the support hole and threadedly connected with the support hole to install the support column on the installation portion, a plurality of installation portions are provided, and the installation portions and the support members are arranged in one-to-one correspondence.

[0010] Further, the outer pressing assembly comprises an annular pressing plate and a plurality of pressing members, the annular pressing plate is used for pressing downward on the flame tube head in the vertical direction, the plurality of pressing members are uniformly arranged in the circumferential direction of the support base plate, the pressing member comprises a pressing bolt penetrating the installation portion and the pressing portion in the vertical direction, and a pressing nut threadedly connected with the free end of the pressing bolt.

[0011] Further, the positioning base plate, the positioning cone, the support base plate and the annular pressing plate are all made of aluminum material.

[0012] Further, a connecting hole is formed on the support base plate, a threaded bushing is arranged in the connecting hole, and the positioning assembly further comprises a fixing screw penetrating the positioning base plate and connected with the threaded bushing to fix the positioning base plate on the support base plate.

[0013] Further, the positioning cone is provided with a plurality of U-shaped grooves, the plurality of U-shaped grooves are uniformly arranged along the circumferential direction and correspondingly arranged along the horizontal direction, the adjusting piece is arranged in a U shape and is used for simultaneously inserting and fitting with two U-shaped grooves in the vertical direction.

[0014] Further, the inner pressing assembly comprises a pressing part arranged in a cross shape and used for pressing the head of the flame tube, a connecting part arranged on the pressing part and a wing nut, a free end of the connecting part is used for being sequentially arranged on the head of the flame tube, the flow guide plate and the positioning cone, and the wing nut is threadedly connected with the free end of the connecting part.

[0015] According to another aspect of the present application, a welding method of an aero-engine flame tube head assembly is also provided, the welding method comprises the aero-engine flame tube head assembly welding jig, and comprises the following steps: S1, the head of the flame tube is fixed on the support assembly by the outer pressing assembly, and the circular hole centering of the plurality of flow guide plates is performed by the head of the flame tube; S2, the positioning bottom plate in the positioning assembly is inserted on the support assembly, and the outer wall surface of the positioning cone is abutted against the flow guide plates, and then the flow guide plates are positioned by cooperating with the head of the flame tube; S3, the positioning cone, the flow guide plates and the head of the flame tube are arranged by the inner pressing assembly, so as to preliminarily press the flow guide plates, then the gap between the two adjacent flow guide plates is adjusted by the adjusting piece, after the gap is adjusted in place, the flow guide plates are fully pressed by the inner pressing assembly; S4, the welding jig is turned over, so as to weld and fix the flow guide plates on the head of the flame tube, after the welding is completed, the outer pressing assembly, the inner pressing assembly and the positioning assembly are sequentially disassembled, and then the welding of the next flame tube head assembly can be performed.

[0016] The present application has the following beneficial effects:

[0017] The aviation engine flame tube head assembly welding fixture of the present application fixes the flame tube head through the cooperation of the support assembly and the outer pressing assembly, the positioning assembly is inserted and cooperated with the support bottom plate along the vertical direction to form a reference surface arranged along the horizontal direction, and then the outer wall surface of the positioning cone is profiled with the inner cone of the flame tube head to support and abut the multiple guide plates, and the flame tube head is used to center the round holes of the guide plates to reliably position the multiple guide plates, the inner pressing assembly is inserted through the positioning cone, the guide plate and the flame tube head to press the positioning cone close to the flame tube head, and then the guide plate is preliminarily pressed and fixed, at this time, the adjusting piece is inserted and cooperated with the positioning cone and clamped between the adjacent two guide plates to adjust the gap between the adjacent two guide plates, so that the circumferential gap between the adjacent two guide plates meets the requirements, and then the inner pressing assembly is used to fully press and fix the guide plate; after the guide plate is reliably positioned and fixed, the installation edge of the flame tube head and the vertical distance between the reference surface and the center of the upper end surface of the guide plate can be simply and accurately measured due to the horizontal arrangement of the reference surface, and then the distance between the inner cone of the flame tube head and the guide plate can be obtained by simple conversion to confirm whether the size is qualified; after the key sizes are confirmed to be qualified, the welding fixture is turned over to quickly complete the welding and fixation of the multiple guide plates; compared with the prior art, the present application realizes the one-time clamping and welding of the multiple guide plates, the flame tube head assembly has good consistency, the welding efficiency is high, the key sizes of the flame tube head assembly can be ensured to be qualified during welding and assembly, the welding difficulty is greatly reduced, the practicality is high, and the present application is suitable for wide promotion and application.

[0018] In addition to the objects, features, and advantages described above, the present application has other objects, features, and advantages. The present application will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application, and assist in

[0020] Figure 1 is a structural schematic view of the aviation engine flame tube head assembly welding fixture of the preferred embodiment of the present application;

[0021] Figure 2 is a structural schematic view of the aviation engine flame tube head assembly welding fixture of the preferred embodiment of the present application;

[0022] Figure 3 is a sectional view of the aviation engine flame tube head assembly welding fixture of the preferred embodiment of the present application;

[0023] Figure 4is a partial structural schematic view of an aero-engine flame tube head assembly welding fixture of a preferred embodiment of the present application;

[0024] Figure 5 is a partial structural schematic view of an aero-engine flame tube head assembly welding fixture of a preferred embodiment of the present application;

[0025] Figure 6 is a simplified schematic view of the aero-engine flame tube head assembly welding fixture of a preferred embodiment of the present application.

[0026] Legend:

[0027] 100, support assembly; 110, support base plate; 120, support column; 130, connecting screw; 140, threaded bushing; 200, outer compression assembly; 210, annular compression plate; 220, compression bolt; 230, compression nut; 300, positioning assembly; 310, positioning base plate; 320, positioning cone; 330, fixing screw; 400, inner compression assembly; 410, abutting portion; 420, connecting portion; 430, wing nut; 500, adjusting member. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0029] As shown in Figures 1-4 , the aero-engine flame tube head assembly welding fixture of the present embodiment comprises a support assembly 100, an outer compression assembly 200, a positioning assembly 300, an inner compression assembly 400, and an adjusting member 500, the support assembly 100 is used to support the flame tube head from the bottom, the outer compression assembly 200 is arranged on the support assembly 100 and is used to compress and fix the flame tube head in cooperation with the support assembly 100, the positioning assembly 300 comprises a positioning base plate 310 and a positioning cone 320, the positioning base plate 310 is inserted and cooperated with the support assembly 100 in the vertical direction and forms a reference surface arranged in the horizontal direction, the outer wall surface of the positioning cone 320 is used to profile the inner cone of the flame tube head to support the guide vane, thereby cooperating with the flame tube head to position the guide vane, the inner compression assembly 400 is used to pass through the positioning cone 320, the guide vane, and the flame tube head to apply a compression force to the positioning cone 320 close to the flame tube head, thereby compressing and fixing the guide vane, and the adjusting member 500 is used to be inserted and cooperated with the positioning cone 320 and clamped between two adjacent guide vanes to adjust the gap between the two adjacent guide vanes.

[0030] As shown in Figures 1-4 , optionally, the positioning base plate 310 and the positioning cone 320 are integrally formed as a monolithic structure.

[0031] AsFigures 1-4 As shown, specifically, the aero-engine flame tube head assembly welding fixture of the present application cooperates the flame tube head through the support assembly 100 and the outer pressing assembly 200, the positioning assembly 300 cooperates the support base plate 110 along the vertical direction through the positioning base plate 310 and forms the reference surface along the horizontal direction, then cooperates the inner cone of the flame tube head through the outer wall surface of the positioning cone 320 to support the guide plate and center the round hole of the guide plate, so as to realize the reliable positioning of the guide plate, the inner pressing assembly 400 is arranged in the positioning cone 320, the guide plate and the flame tube head to apply the pressing force to the positioning cone 320 close to the flame tube head, and then preliminarily press and fix the guide plate, at this time, the adjusting part 500 cooperates the positioning cone 320 and is clamped between the adjacent two guide plates to adjust the gap between the adjacent two guide plates, so as to ensure that the circumferential gap between the adjacent two guide plates meets the requirements, and then the inner pressing assembly 400 is used to fully press and fix the guide plate; after the guide plate is reliably positioned and fixed, since the reference surface is horizontally arranged, the vertical distance between the mounting edge of the flame tube head and the reference surface and the vertical distance between the center of the upper end surface of the guide plate and the reference surface can be simply and accurately measured, and then the distance between the inner cone of the flame tube head and the guide plate can be obtained by simple conversion to confirm whether the size is qualified; after the key sizes are confirmed to be qualified, the welding fixture is turned over, and the welding and fixation of the guide plate can be quickly completed; compared with the prior art, the present scheme realizes the one-time clamping and welding of multiple guide plates, the flame tube head assembly has good consistency, the welding efficiency is high, the key sizes of the flame tube head assembly can be ensured to be qualified during welding and assembly, the welding difficulty is greatly reduced, the practicability is high, and the present scheme is suitable for wide promotion and application.

[0032] As shown in Figure 5 and Figure 6 In the present embodiment, the conversion formula of the distance between the inner cone of the flame tube head and the guide plate is:

[0033] A =

(A1-A2) / sinα

[0034] Wherein, A is the distance between the inner cone of the flame tube head and the guide plate, A1 is the vertical distance between the mounting edge of the flame tube head and the center of the upper end surface of the guide plate, A2 is the vertical distance between the mounting edge of the flame tube head and the center of the outer wall surface of the inner cone of the flame tube head, H is the vertical distance between the mounting edge of the flame tube head and the reference surface, h is the vertical distance between the center of the upper end surface of the guide plate and the reference surface, t is the thickness of the guide plate, and α is the taper of the inner cone of the flame tube head.

[0035] As shown in Figure 5 and Figure 6As shown, it should be understood that, among the above parameters, A2, t and a are fixed values during the welding assembly, A1 is obtained by conversion of H and h, and thus, during the assembly, H and h are precisely controlled by the welding fixture to ensure that A meets the requirements, and the fitting accuracy is ensured to meet the requirements by the plug-in fitting, and the horizontally laid reference surface is formed to facilitate the measurement of H and h.

[0036] It should be understood that the conversion of the size of the closed cavity inside the part is achieved by the above calculation formula, and the problem of being unable to measure and ensure the size of the closed cavity inside the part is solved.

[0037] As shown in Figure 1 and Figure 2 In the embodiment, the support assembly 100 includes a support bottom plate 110 and a plurality of support pieces, the outer pressing assembly 200 is arranged on the support bottom plate 110, the positioning bottom plate 310 is plug-in fitted with the support bottom plate 110, the plurality of support pieces are arranged on the support bottom plate 110 along the circumferential direction of the support bottom plate 110 and are arranged in a staggered manner with the inner pressing assembly 400 in the circumferential direction, and the plurality of support pieces are used to support the flame tube head from the bottom. Specifically, the support assembly 100 installs the outer pressing assembly 200, the positioning assembly 300 and the plurality of support pieces through the support bottom plate 110, and then uniformly supports the flame tube head from the bottom through the plurality of support pieces, and the support pieces are arranged in a staggered manner with the inner pressing assembly 400 in the circumferential direction, so as to provide sufficient welding space for the welding of the guide plate, thereby reducing the welding difficulty and improving the welding efficiency.

[0038] In the embodiment, the plug-in fitting tolerance of the positioning bottom plate 310 and the support bottom plate 110 is H7 / g6. Specifically, H7 / g6 is a high-precision clearance fit, which ensures high-precision clearance fit of the positioning bottom plate 310 and the support bottom plate 110, so as to improve the assembly precision while facilitating disassembly, thereby achieving precise control of H and h.

[0039] As shown in Figures 1-3 In the embodiment, the outer ring wall of the support bottom plate 110 is provided with a mounting portion extending radially outward, the mounting portion is provided with a support hole, the support piece includes a support column 120 arranged on the support hole in the vertical direction and a connecting screw 130 threaded into the support hole and used to mount the support column 120 on the mounting portion, a plurality of mounting portions are provided, and the mounting portions and the support pieces are arranged in one-to-one correspondence.

[0040] As shown in Figures 1-3As shown, in this embodiment, the external pressing assembly 200 includes an annular pressing plate 210 and a plurality of pressing members. The annular pressing plate 210 is used to press the flame tube head vertically downward. The plurality of pressing members are evenly spaced along the circumference of the support base plate 110. The pressing members include a pressing bolt 220 vertically passing through the mounting portion and the pressing portion 410, and a pressing nut 230 threadedly connected to the free end of the pressing bolt 220. Specifically, when the annular pressing plate 210 presses the flame tube head vertically downward, the pressing bolt 220 vertically passes through the mounting portion and the pressing portion 410, and is then threadedly connected to the free end of the pressing bolt 220 via the pressing nut 230, so as to press and fix the flame tube head to the support base plate 110.

[0041] In this embodiment, the positioning base plate 310 , the positioning cone 320 , the supporting base plate 110 and the annular pressure plate 210 are all made of aluminum material, so as to greatly reduce the weight of the welding fixture and facilitate the flipping operation.

[0042] like Figures 1-3 As shown, in this embodiment, a connection hole is provided on the support base plate 110, and a threaded bushing 140 is disposed in the connection hole. The positioning assembly 300 further includes a fixing screw 330 that is provided through the positioning base plate 310 and connected to the threaded bushing 140 for securing the positioning base plate 310 to the support base plate 110. Specifically, the fixing screw 330 is provided through the positioning base plate 310 to connect with the threaded bushing 140, thereby securing the positioning base plate 310 to the support base plate 110. Since the support base plate 110 is made of aluminum, if the threads are directly provided on the support base plate 110, the thread strength is relatively low, and frequent tightening and loosening can easily lead to failure. Therefore, the threaded bushing 140 is used to improve the thread strength and ensure reliable assembly. Optionally, a plurality of connection holes are provided, and the plurality of connection holes are evenly spaced along the circumference of the support base plate 110, with the fixing screw 330, threaded bushing 140, and connection holes arranged in a one-to-one correspondence.

[0043] like Figures 1-3 As shown, in this embodiment, the positioning cone 320 is provided with multiple U-shaped grooves, which are evenly spaced circumferentially and arranged in a corresponding manner horizontally. The adjustment member 500 is arranged in a U-shape and is configured to simultaneously engage with two U-shaped grooves in the vertical direction. Specifically, by being arranged in a U-shape and engaging with both U-shaped grooves in the vertical direction, when inserted between two adjacent guide plates, the gap between the two adjacent guide plates can be evenly adjusted to ensure that the gap between the two adjacent guide plates meets the required gap. The number of U-shaped grooves spaced circumferentially is the same as the number of guide plates, thereby sequentially adjusting the gap between the two adjacent guide plates.

[0044] like Figures 3-4As shown, in the embodiment, the inner pressing assembly 400 includes a cross-shaped pressing portion 410 for pressing the flame tube head, a connecting portion 420 arranged on the pressing portion 410, and a wing nut 430, a free end of the connecting portion 420 is used to be sequentially arranged in the flame tube head, the guide plate and the positioning cone 320, and the wing nut 430 is threadedly connected with the free end of the connecting portion 420. Specifically, the free end of the connecting portion 420 is sequentially arranged in the flame tube head, the guide plate and the positioning cone 320, so that the pressing portion 410 is in abutment with the flame tube head, and then the wing nut 430 is threadedly connected with the free end of the connecting portion 420, so that the preliminary pressing and the sufficient pressing of the guide plate can be realized by rotating the wing nut 430, and the cross-shaped pressing portion 410 facilitates the welding and fixing of the guide plate.

[0045] As shown, Figures 1-3 As shown, the welding method of the aircraft engine flame tube head assembly in the embodiment adopts the above-mentioned welding fixture of the aircraft engine flame tube head assembly, and includes the following steps: S1, the flame tube head is fixed and pressed on the support assembly 100 by the outer pressing assembly 200, and the circular hole centering of the plurality of guide plates is performed by the flame tube head; S2, the positioning bottom plate 310 in the positioning assembly 300 is inserted on the support assembly 100, and the outer wall surface of the positioning cone 320 is in abutment with the guide plate, so that the positioning of the guide plate is performed in cooperation with the flame tube head; S3, the positioning cone 320, the guide plate and the flame tube head are arranged in the inner pressing assembly 400, so that the preliminary pressing of the guide plate is performed, and then the gap between the adjacent two guide plates is adjusted by the adjusting piece 500, and after the gap is adjusted in place, the sufficient pressing of the guide plate is performed by the inner pressing assembly 400; S4, the welding fixture is turned over, so that the guide plate is welded and fixed on the flame tube head, and after the welding is completed, the outer pressing assembly 200, the inner pressing assembly 400 and the positioning assembly 300 are sequentially disassembled, and then the welding of the next flame tube head assembly can be performed. Specifically, the above-mentioned welding fixture of the aircraft engine flame tube head assembly is adopted to complete the assembly and welding of the flame tube head assembly, and the key dimension is ensured to be qualified during the assembly process, so that sufficient welding space is provided for the welding, the welding efficiency is high, the quality is good, the practicability is strong, and the welding fixture is suitable for wide promotion and application.

[0046] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An aeroengine flame tube head assembly welding fixture, characterized by, The support assembly (100) is used for supporting the flame tube head from the bottom, the outer pressing assembly (200) is arranged on the support assembly (100) and is used for cooperating with the support assembly (100) to press and fix the flame tube head, the positioning assembly (300) comprises a positioning bottom plate (310) and a positioning cone (320), the positioning bottom plate (310) is inserted and matched with the support assembly (100) along the vertical direction and forms a reference surface arranged along the horizontal direction, and the outer wall surface of the positioning cone (320) is used for profiling the inner cone of the flame tube head to abut against the guide plate, so that the guide plate is positioned in cooperation with the flame tube head, the inner pressing assembly (400) is used for penetrating the positioning cone (320), the guide plate and the flame tube head to apply a pressing force of the positioning cone (320) to the flame tube head, so that the guide plate is press-fixed, and the adjusting piece (500) is used for being inserted and matched with the positioning cone (320) and clamped between the adjacent two guide plates to adjust the gap between the adjacent two guide plates. A plurality of U-shaped grooves are formed in the positioning cone (320), the plurality of U-shaped grooves are uniformly arranged along the circumferential direction and correspondingly arranged along the horizontal direction, and the adjusting piece (500) is arranged in a U-shaped manner and is used for being inserted and matched with two U-shaped grooves in the vertical direction at the same time. The inner pressing assembly (400) comprises a pressing portion (410) arranged in a cross shape and used for pressing the flame tube head, a connecting portion (420) arranged on the pressing portion (410), and a butterfly nut (430), a free end of the connecting portion (420) is used for penetrating the flame tube head, the guide plate and the positioning cone (320) in sequence, and the butterfly nut (430) is threadedly connected with the free end of the connecting portion (420).

2. The aeroengine flame tube head assembly welding fixture of claim 1, wherein, The support assembly (100) comprises a support bottom plate (110) and a plurality of support pieces, the outer pressing assembly (200) is arranged on the support bottom plate (110), the positioning bottom plate (310) and the support bottom plate (110) are inserted and matched, the plurality of support pieces are arranged on the support bottom plate (110) along the circumferential direction of the support bottom plate (110) and are arranged in a staggered manner with the inner pressing assembly (400) in the circumferential direction, and the plurality of support pieces are used for supporting the flame tube head from the bottom.

3. The aeroengine flame tube head assembly welding fixture of claim 2, wherein, The matching tolerance of the inserted and matched connection of the positioning bottom plate (310) and the support bottom plate (110) is H7 / g6.

4. The aeroengine flame tube head assembly welding fixture of claim 2, wherein, An installation portion is formed on the outer ring wall of the support bottom plate (110) and extends outwardly along the radial direction, a support hole is formed in the installation portion, the support piece comprises a support column (120) arranged on the support hole along the vertical direction and a connecting screw (130) penetrating the support hole and threadedly connected with the support hole and used for mounting the support column (120) on the installation portion, a plurality of installation portions are arranged, and the installation portion and the support piece are arranged in a one-to-one correspondence.

5. The aeroengine flame tube head assembly welding fixture of claim 4, wherein, The outer pressing assembly (200) comprises an annular pressing plate (210) for pressing the flame tube head downward in the vertical direction and a plurality of pressing members uniformly arranged along the circumference of the support base plate (110), wherein the pressing member comprises a pressing bolt (220) penetrating the mounting portion and the pressing portion (410) in the vertical direction, and a pressing nut (230) threadedly connected with the free end of the pressing bolt (220).

6. The aeroengine flame tube head assembly welding fixture of claim 5, wherein, The positioning base plate (310), the positioning cone (320), the support base plate (110) and the annular pressing plate (210) are all made of aluminum material.

7. The aeroengine flame tube head assembly welding fixture of claim 6, wherein, The support base plate (110) is provided with a connecting hole, and a threaded bushing (140) is arranged in the connecting hole; the positioning assembly (300) further comprises a fixing screw (330) penetrating the positioning base plate (310) and connected with the threaded bushing (140) for fixing the positioning base plate (310) to the support base plate (110).

8. An aircraft engine flame tube head assembly welding method, characterized by, The method for welding the flame tube head assembly of the aero-engine by using the welding fixture of any one of claims 1-7 comprises the following steps: S1, the flame tube head is fixed and pressed on the support assembly (100) by the outer pressing assembly (200), and the circular hole centering of the plurality of guide plates is performed by using the flame tube head; S2, the positioning base plate (310) of the positioning assembly (300) is inserted into the support assembly (100), and the outer wall of the positioning cone (320) is abutted against the guide plates, so as to position the guide plates in cooperation with the flame tube head; S3, the positioning cone (320), the guide plates and the flame tube head are penetrated by the inner pressing assembly (400) to preliminarily press the guide plates, and then the gap between the adjacent two guide plates is adjusted by the adjusting member (500) in sequence, after the gap is adjusted in place, the guide plates are fully pressed by the inner pressing assembly (400); S4, the welding fixture is turned over to weld and fix the guide plates on the flame tube head, after the welding is completed, the outer pressing assembly (200), the inner pressing assembly (400) and the positioning assembly (300) are sequentially disassembled, and then the welding of the next flame tube head assembly can be performed.

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