A welding deformation control device and method for the flame tube head fairing and long support

Abstract

The present invention discloses a welding deformation control device for the head fairing and the long support of a combustion chamber liner, which comprises a fixture base plate, on which a profile die is arranged; the pressing assembly includes an even number of pressing blocks arranged above the profile die and a pressing plate arranged above the pressing blocks; the pressing plate is installed on the fixture base plate through a movable member and is driven by the movable member to move; the positioning assembly includes a bracket arranged on the fixture base plate, a positioning plate and a double-grooved fixed-distance movable pin sequentially installed on the bracket, and a telescopic square block connected to the positioning plate. The clamping of this device is simple and convenient. The profile die is used to support and fix the fairing, reducing the large deformation caused by the concentration of welding stress due to the thin wall; the profile die is detachable and replaceable, enabling the clamping and pressing of parts with different profiles. The present invention also includes a method for controlling the welding deformation of the head fairing and the long support of a combustion chamber liner, avoiding the large deformation caused by insufficient wall thickness and stiffness when the fairing is welded to the long support with uneven wall thickness.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine part processing, and particularly relates to a welding deformation control device and method for a flame tube head fairing and a long support. Background Art

[0002] As a key component for adjusting air flow and reducing resistance in an aero-engine, the fairing is mainly a semi-closed sheet metal forming structure with a relatively complex surface profile. It is one of the main components of the flame tube head and is mainly used to adjust the air flow balance and maintain stable combustion of the engine.

[0003] As Figure 1 shown in Figure 2 (in the figure, H is the height; D is the diameter; X is the angle). The ultra-long support is welded to the bottom of the fairing at a certain angular direction and quantity. The length of the support reaches 50 mm. The fairing is mostly a thin-wall high-temperature alloy forging with a thickness of 1-2 mm. The long support is machined from a bar. The long support and the fairing are connected by argon arc welding. Since the reference surface of the part is a special-shaped sheet metal formed fairing, the positioning reference is poor. The length of the support is large, the wall thickness of the assembly welding surface is uneven, and the positioning rigidity is weak. During the welding process of the fairing and the long support, the long support will undergo serious torsional deformation, resulting in increased difficulty in subsequent machining and assembly. Therefore, how to control the deformation of the long support and the fairing during the welding process is particularly important. Summary of the Invention

[0004] The present invention aims to provide a welding deformation control device and method for a flame tube head fairing and a long support. By designing a set of supports for a semi-closed special-shaped surface and a retractable square block fixture, the welding deformation of the ultra-long support and the thin-wall fairing is controlled; in cooperation with a bearing ring rotating base, a method for controlling the welding deformation of a thin-wall formed part and a long support with uneven wall thickness is provided.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A welding deformation control device for a flame tube head fairing and a long support, comprising a fixture bottom plate, and a profiled tire arranged on the fixture bottom plate for supporting and fixing the fairing;

[0007] A pressing assembly, the pressing assembly comprising an even number of pressing blocks arranged above the profiled tire for pressing the fairing, and a pressing plate arranged above the pressing blocks; the pressing plate is installed on the fixture bottom plate through a movable member, and the movable member drives the pressing plate to move;

[0008] A positioning assembly, the positioning assembly comprising a bracket vertically arranged on the fixture bottom plate, a positioning plate and a double-grooved fixed-distance movable pin sequentially installed on the bracket, and a retractable square block connected to the positioning plate.

[0009] Preferably, it further includes a working turntable; the working turntable includes a workbench bottom plate and a workbench turntable provided on the workbench bottom plate; the workbench turntable is connected to the workbench bottom plate through a bearing; the fixture bottom plate is installed on the workbench turntable.

[0010] Preferably, the form tire is detachably connected to the fixture bottom plate.

[0011] Preferably, the movable member includes an adjusting support that penetrates the fixture bottom plate and extends to contact the pressing plate, and a class B equal-length double-headed stud that penetrates the fixture bottom plate and the pressing plate; the pressing plate can move radially along the adjusting support; the pressing plate can move up and down along the class B equal-length double-headed stud.

[0012] Preferably, the positioning plate and the double-grooved fixed-distance movable pin are respectively perpendicular to the bracket.

[0013] A method for controlling the welding deformation of the flame tube head fairing and the long support includes the following processing steps:

[0014] 1) Clamp the fairing and the long support, install the fairing and the long support on the welding deformation control device, and perform pre-pressing and fixing; rotate the working turntable and repeat to complete the clamping of other long supports;

[0015] 2) Use a welding torch to symmetrically position-weld 2-8 points on the welding part of the long support and the fairing;

[0016] 3) After the positioning welding is completed, check the corresponding dimensions and the positioning welding points, and make fine adjustments;

[0017] 4) Adjust the welding machine according to the welding parameters and start welding the fairing and the long support;

[0018] 5) Repeat the above steps to complete the welding of other long supports;

[0019] 6) After the welding is completed, wait for the welded structure to cool to room temperature and then remove it.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The welding device and method for the flame tube head fairing and the long support in the present invention solve the problems of large deformation and inaccurate position caused by insufficient wall thickness and stiffness during welding of the ultra-long support and the special-shaped sheet metal formed thin-walled part. The device can realize the radial and vertical movement of the pressing plate through the B-level stud and the adjusting support, so as to realize the assembly welding of fairings with different diameters and supports with different lengths. The support and fixation of the fairing profile by the profiled tire reduce the large deformation caused by the concentration of welding stress due to the thin wall. The fixed-distance movable pin with double grooves determines the distance from the support to the center, avoiding many uncertain factors such as inconvenient distance measurement, inaccurate angular orientation, and position deviation during the clamping and positioning process on the fairing.

[0022] The clamping of the welding device is simple and convenient, and the profiled tire is detachable and replaceable, which can realize the clamping and pressing of parts with different profiles. The fixed-distance movable pin, the fixture base plate with adjustable support, and the telescopic square block can realize the welding of supports with different lengths and fairings with different indexing diameters to a certain extent. The combined use of the rotary table fixed with bearings greatly reduces the workload of the operator and improves the processing efficiency significantly. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the fairing and the long support;

[0025] Figure 2 is Figure 1 the cross-sectional view at T-T in

[0026] Figure 3 It is a schematic structural diagram of the welding deformation control device for the flame tube head fairing and the long support in the present invention;

[0027] Reference numerals: 1-fixture base plate, 2-profiled tire, 3-B-level equal-length stud, 4-pressure block, 5-pressing plate, 6-bracket, 7-positioning plate, 8-fixed-distance movable pin with double grooves, 9-telescopic square block, 10-workbench base plate, 11-workbench turntable, 12-bearing, 13-adjusting support, 14-fairing, 15-long support. Detailed Embodiments

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and conventional means in the art are included in the scope of the present invention.

[0029] Referring to Figure 3 , a welding deformation control device for the flame tube head fairing and the long support in the present invention includes a fixture base plate 1, the fixture base plate 1 is installed on the workbench turntable 11, and the workbench turntable 11 is connected to the workbench base plate 10 through a bearing 12. The workbench turntable 11 is driven to rotate by the bearing 12, and then the fixture base plate 1 and the components on the fixture base plate 1, the installed fairing 14 and the long support 15 can be driven to rotate, which is convenient for operation and improves the assembly and welding efficiency, is convenient for adjustment, and at the same time reduces the secondary deformation caused by multiple manual flips.

[0030] A profiled tire 2 for supporting and fixing the fairing 14 is provided on the fixture base plate 1. Specifically, the profiled tire 2 is detachably connected to the fixture base plate 1; in this embodiment, the profiled tire 2 is installed on the top of the fixture base plate 1 through fixing screws. The profiled tire 2 is provided for supporting and fixing the fairing surface of the fairing 14.

[0031] A pressing component, the pressing component includes an even number of pressing blocks 4 provided above the profiled tire 2 for pressing the fairing 14, and a pressing plate 5 provided above the pressing blocks 4; as a preferred solution of this embodiment, preferably, the pressing blocks 4 are independent individuals, and an even number such as 4, 6, 8, etc. can be set according to the diameter of the fairing 14 for fixing the upper end of the fairing.

[0032] The movable member includes an adjusting support 13 passing through the fixture base plate 1 and extending to contact the pressing plate 5, and a class B equal-length double-headed stud 3 passing through the fixture base plate 1 and the pressing plate 5.

[0033] Specifically, the pressing plate 5 realizes radial and vertical movement through a kinematic pair composed of a class B equal-length double-headed stud 3 and an adjusting support 13 installed on the fixture base plate 1. The class B equal-length double-headed stud 3 passing through the fixture base plate 1 and the pressing plate 5 and the adjusting support 13 passing through the fixture base plate 1 and extending outside are both in surface contact with the pressing plate 5 to form a lower kinematic pair; the pressing plate 5 can move radially along the adjusting support 13; the pressing plate 5 can move up and down along the class B equal-length double-headed stud 3. The setting of the movable member can adjust the height of the pressing plate 5 according to the height of the parts to be welded, realize the clamping of parts to be welded at different heights, and at the same time facilitate the clamping and disassembly of parts.

[0034] The positioning assembly includes a bracket 6 vertically mounted on the fixture base plate 1 and located at the other end of the mold 2. A positioning plate 7 and a double-grooved, distance-removable pin 8 are sequentially mounted on the top of the bracket 6. The positioning plate 7 and the double-grooved, distance-removable pin 8 are respectively positioned perpendicular to the bracket 6. A compression screw is provided on the end of the positioning plate 7 close to the bracket 6, and a telescopic square block 9 is connected to the end of the positioning plate 7 facing away from the bracket 6. The telescopic square block 9 is telescopic in the direction of the mold 2 and is provided with a limit screw for limiting the position of the telescopic square block 9.

[0035] When the fairing 14 is placed on the tire 2, the fairing 14 is pressed by the cooperation of the movable parts (B-grade equal-length studs 3, adjustment supports 13), the pressure blocks 4 and the pressure plates 5, and the long support 15 is placed on the fairing 14 according to the angular position. The telescopic square block 9 is adjusted to align with the hole on the long support 15. At the same time, the telescopic square block 9 is adjusted to support and tighten the two sides of the long support 15 to reduce the welding deformation of the long support 15 caused by insufficient rigidity, and the limit screws are used for circumferential positioning; then the fixed-distance movable pin 8 with double grooves is adjusted to determine the center distance of the long support 15, and finally the long support 15 is pressed and fixed by the double grooves.

[0036] During the parts pressing and welding process, the fairing 14 is supported by the tire 2 to prevent collapse; the long support 15 uses a telescopic square block 9 with a limit screw to support and expand the two sides of the long support 15, and then the limit screw is tightened to fix the long support 15 circumferentially to avoid welding deformation caused by insufficient rigidity due to excessive length; at the same time, the fixed-distance movable pin 8 with a double groove is adjusted to circumferentially position the long support 15 to the center of the fairing 14 to ensure the welding assembly gap, and finally the long support 15 is pressed and fixed by the double groove.

[0037] The present invention also provides a method for controlling welding deformation of a flame tube head fairing and a long support, comprising the following processing steps:

[0038] 1) Clamp the fairing 14 and the long support 15, install the fairing 14 and the long support 15 on the welding deformation control device, and pre-tighten and fix them; rotate the work turntable and repeat the clamping of other long supports; after the clamping process is completed, properly adjust the gap between the fairing 14 and the long support 15 to make the working surface of the fairing 14 and the long support 15 fit well, and finally completely press and fix all the long supports 15 and the fairing 14;

[0039] 2) Use a welding torch to evenly and symmetrically weld 2-8 points on the welding parts of the long support and the fairing;

[0040] 3) After the positioning welding is completed, check the corresponding dimensions and the positioning welding points, and make fine adjustments;

[0041] 4) Adjust the welding machine according to the welding parameters and start welding the fairing 14 and the long support 15;

[0042] 5) Repeat the above steps to complete the welding of other long supports 15;

[0043] 6) After the welding is completed, remove the welded structure after it cools down to room temperature.

[0044] When welding the fairing 14 and the long support 15 by using this method, through this welding device, the surface alignment and the end face reference determination of the fairing 14 are carried out, and at the same time, the relative positions of the fairing 14 and the support are fixed to control the welding deformation of the support and the fairing 14; cooperating with the rotation of the workbench turntable 11 is convenient for workers' assembly and welding operations, shortening the welding time and reducing workers' fatigue.

[0045] The above has introduced in detail a device and method for controlling the welding deformation of a flame tube head fairing and a long support provided by the present invention. Specific examples are used in this article to elaborate on the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A welding deformation control device for the flame tube head fairing and the long support, characterized in that: It includes a fixture base plate (1), and a form tire (2) for supporting and fixing a fairing (14) is arranged on the fixture base plate (1); A pressing component, the pressing component includes an even number of pressing blocks (4) arranged above the form tire (2) for pressing the fairing (14), and a pressing plate (5) arranged above the pressing blocks (4); the pressing plate (5) is installed on the fixture base plate (1) through a movable part, and the movable part drives the pressing plate (5) to move; the pressing blocks (4) are independent individuals for fixing the upper end of the fairing; A positioning component, the positioning component includes a bracket (6) vertically arranged on the fixture base plate (1), a positioning plate (7) and a double-grooved fixed-distance movable pin (8) sequentially installed on the bracket (6), and a telescopic square block (9) connected to the positioning plate (7); adjust the telescopic square block (9) to align with the holes on the long support (15), adjust the telescopic square block (9) to support and expand the two side surfaces of the long support (15), and use a limit screw to limit the telescopic square block (9); It further includes a working turntable; the working turntable includes a working table base plate (10), and a working table turntable (11) arranged on the working table base plate (10); the working table turntable (11) is connected to the working table base plate (10) through a bearing (12); the fixture base plate (1) is installed on the working table turntable (11); The movable part includes an adjusting support (13) passing through the fixture base plate (1) and extending to contact the pressing plate (5), and a Class B equal-length double-headed stud (3) passing through the fixture base plate (1) and the pressing plate (5); the pressing plate (5) can move radially along the adjusting support (13); the pressing plate (5) can move up and down along the Class B equal-length double-headed stud (3); The pressing plate (5) realizes radial and up-and-down movements through a kinematic pair composed of the Class B equal-length double-headed stud (3) and the adjusting support (13) installed on the fixture base plate (1); the Class B equal-length double-headed stud (3) passing through the fixture base plate (1) and the pressing plate (5) and the adjusting support (13) passing through the fixture base plate (1) and extending to the outside are both in surface contact with the pressing plate (5) to form a lower kinematic pair.

2. The welding deformation control device for the flame tube head fairing and the long support according to claim 1, characterized in that: The form tire (2) is detachably connected to the fixture base plate (1).

3. A welding deformation control device for the head fairing and long support of a combustion chamber, according to claim 1, characterized in that: The positioning plate (7) and the double-grooved fixed-distance movable pin (8) are respectively perpendicular to the bracket (6).

4. A method for controlling the welding deformation of the head fairing and the long support of the flame tube, which uses the device described in claim 1 to weld the head fairing and the long support of the flame tube, is characterized in that: It includes the following processing steps: 1) Clamp the fairing (14) and the long support (15), install the fairing (14) and the long support (15) on the welding deformation control device, and perform pre-pressing and fixing; rotate the working turntable, and repeat to complete the clamping of other long supports; 2) Use a welding torch to symmetrically position-weld 2-8 points on the welding part of the long support and the fairing; 3) After the positioning welding is completed, check the corresponding dimensions and the positioning welding points, and perform fine adjustment; 4) Adjust the welding machine according to the welding parameters and start welding the fairing (14) and the long support (15); 5) Repeat the above steps to complete the welding of other long supports (15); 6) After welding is completed, remove it after the welded structure has cooled to room temperature.

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