Engine exhaust casing assembling and welding assembly and welding method

Abstract

The invention provides an engine exhaust casing assembling and welding assembly and a welding method, and relates to the technical field of aero-engines. The assembling and welding assembly comprises a positioning tool plate (1), a supporting plate (2), a large supporting plate supporting block (3) and a small supporting plate supporting block (4). The positioning tool plates (1) of the supporting plate (2) are connected to the end faces of the two sides of the inner casing. The large supporting plate supporting block (3) and the small supporting plate supporting block (4) are both installed on the supporting plate (2) in a threaded connection mode, attached to the inner wall of the inner case and used for controlling welding deformation. The welding method comprises the following steps: fixing a case to be welded on the assembly welding assembly, and then performing spot welding positioning. According to the welding assembly and the welding method, accurate positioning can be achieved, welding deformation can be effectively controlled, and the welding seam quality can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and particularly relates to an assembly welding component and a welding method for an engine exhaust casing. Background Art

[0002] During the assembly of an engine exhaust casing, it needs to be assembled and welded by an inner casing, an outer casing, large support plates and small support plates. Among them, the inner casing needs to be welded and connected with the large support plates and the small support plates, and the weld is an I-shaped butt weld; the outer casing is positioned and installed and bolt-connected with the large support plates and the small support plates. Among the various components of the engine exhaust casing, the large support plates mainly play a role in support and fixation, while there is a certain degree of freedom between the small support plates and the outer casing.

[0003] In the traditional assembly welding process, due to the complex welding positions of the large support plates and the small support plates with the inner casing and the difficult control of thermal deformation, it is easy to cause insufficient dimensional accuracy of the casing after welding, and even weld cracking or porosity defects may occur. In addition, the existing tooling design has the following problems: (1) Insufficient deformation control: The contact surface between the support plates and the casing lacks effective support during the welding process, resulting in a large amount of welding deformation and affecting the aerodynamic performance of the casing; (2) Low positioning accuracy: It is difficult to unify the assembly reference of the inner and outer casings, which is easy to cause the angle deviation of the support plates and requires multiple rework adjustments; (3) Unstable weld quality: The gap between the support plates and the casing is not accurately controlled, and adhesion or poor weld formation is likely to occur during welding; (4) Complicated operation: The traditional tooling cannot achieve multi-angle welding, and the casing attitude needs to be frequently adjusted, resulting in low efficiency.

[0004] Therefore, there is an urgent need for an assembly welding component and method that can accurately position, effectively control welding deformation and improve weld quality. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an assembly welding component and a welding method for an engine exhaust casing, which are specifically realized through the following technical solutions: An assembly welding component for an engine exhaust casing includes a positioning tooling plate, a support plate, a large support plate support block and a small support plate support block; The support plate is connected to one end face of the inner casing; the positioning tooling plate is installed on the other end face of the inner casing, and the positioning tooling plate is also connected to the outer casing; The large support plate support block and the small support plate support block are both screwed and installed on the support plate and are attached to the inner wall of the inner casing for controlling welding deformation; the large support plate support block is arranged at the connection of the large support plates; the small support plate support block is arranged at the connection of the small support plates.

[0006] Optionally or preferably, the large strut support block and the small strut support block are made of stainless steel; a forming groove is provided on one side of the large strut support block and the small strut support block close to the inner casing; and the surfaces of the large strut support block and the small strut support block close to the inner casing are chrome-plated, which can ensure the forming effect of the weld and avoid adhesion.

[0007] Optionally or preferably, it further includes a support shaft and a tooling bracket; the tooling bracket is arranged on the assembly platform; the support shaft is erected on the top of the tooling bracket, and the support shaft can rotate freely about its axis; the support shaft passes through the positioning tooling plate and the support plate to lift the engine exhaust casing, thus facilitating the welding operation.

[0008] Optionally or preferably, the outer end face of the support plate is flush with the outer end face of the inner casing; the support plate is fixedly connected to the inner casing by a first pressing plate and a first screw.

[0009] Optionally or preferably, a plurality of outer casing fixing plates extend from the outer edge of the positioning tooling plate; the outer casing fixing plates are fixedly connected to the outer casing by a third pressing plate and outer casing screws.

[0010] The present invention also provides a casing assembly welding method, based on the above-mentioned engine exhaust casing assembly welding component, including the following steps: S1. Screw and fix the support plate to one side end face of the inner casing. S2. Assemble the large strut and the small strut from the inner hole side of the inner casing into the space between the inner casing and the outer casing in sequence. S3. Install the large strut support block and the small strut support block on the support plate and attach them to the inner wall of the inner casing. S4. Assemble the positioning tooling plate to the other side end face of the casing, fix the inner casing to the positioning tooling plate with a second pressing plate, and fix the outer casing to the positioning tooling plate with a third pressing plate. S5. Tighten all the bolts and pins used to install the large strut and the small strut. S6. Lift and set the casing and its fittings upright, insert the support shaft into the central holes of the positioning tooling plate and the support plate, and erect the support shaft on the tooling bracket. S7. Weld the large strut, the small strut and the inner casing.

[0011] Optionally or preferably, when welding the large strut, the small strut and the inner casing, it includes: A1. First, use spot welding for positioning to fix each large strut and small strut to the inner casing and the outer casing. The spot welding spacing is not greater than 30 mm, and when spot welding, it is carried out in sequence by welding the diagonals. A2. Adopt a type I butt weld to weld the large strut and the small strut. The welding sequence is to weld the large strut first and then the small strut, and when welding, it is carried out in sequence by welding the diagonals. A3. Adopt a type I butt weld to weld the static pressure test nozzle.

[0012] Optionally or preferably, when welding the large strut, small strut and inner casing, use argon arc welding. The welding consumables are GH3536, the wire diameter is 1.2 mm, the welding current is 50 - 75 A, the arc voltage is 10 - 12 V, and the argon gas flow rate is 10 - 15 L / min.

[0013] Based on the above technical solutions, the following technical effects can be achieved: An engine exhaust casing assembly welding component provided by the present invention, through the double - end fixed design of the support plate and the positioning tooling plate, combined with the wall - adhering support of the large strut support block and the small strut support block, effectively restricts the clamping deformation and welding thermal deformation of the inner casing and outer casing, and can improve the positioning accuracy and welding quality.

[0014] A casing assembly welding method provided by the present invention is simple to operate, has low requirements for equipment and welding angles; has high welding quality and small welding deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 is a schematic structural diagram (3D view) of the engine exhaust casing involved in the present invention; Figure 2 is a schematic structural diagram (3D view) of the present invention; Figure 3 is a left view (section view) of the present invention; Figure 4 is a schematic structural diagram (3D view) of the large strut support block in the present invention; Figure 5 is a schematic structural diagram (3D view) of the small strut support block in the present invention; Figure 6 is a schematic D - D direction structural diagram (only showing part of the structure) of the present invention In the figure: 1 - positioning tooling plate, 2 - support plate, 3 - large support block for the support plate, 4 - small support block for the support plate, 5 - support shaft, 6 - locking nut, 7 - tooling bracket, 8 - first pressing plate, 9 - second pressing plate, 10 - third pressing plate, 11 - spacer sleeve, 12 - cover plate, 13 - cylindrical pin, 14 - first screw, 15 - first flat washer, 16 - second screw, 17 - second flat washer, 18 - third screw, 19 - forming groove, 20 - plug, 21 - lock washer, 22 - positioning pin for the small support plate, 23 - static pressure test nozzle, 24 - fixing plate for the outer casing, 25 - inner casing, 26 - outer casing, 27 - large support plate, 28 - small support plate. Detailed implementation manners

[0017] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1:

[0020] The present invention provides an assembly and welding component for an engine exhaust casing, as Figure 1 shown. The engine exhaust casing includes an inner casing 25, an outer casing 26, a large support plate 27 and a small support plate 28. As Figure 2 and Figure 3 shown, the assembly and welding component includes a positioning tooling plate 1, a support plate 2, a large support block 3 for the support plate and a small support block 4 for the support plate; The support plate 2 is connected to one end face of the inner casing; the positioning tooling plate 1 is installed on the other end face of the inner casing, and the positioning tooling plate 1 is also connected to the outer casing; The large support block 3 for the support plate and the small support block 4 for the support plate are both screwed and installed on the support plate 2, and are attached to the inner wall of the inner casing for controlling welding deformation; the large support block 3 for the support plate is arranged at the connection of the large support plate; the small support block 4 for the support plate is arranged at the connection of the small support plate.

[0021] In this embodiment, as Figure 4 and Figure 5 shown, the large support block 3 for the support plate and the small support block 4 for the support plate are made of stainless steel; a forming groove 19 is formed on the side of the large support block 3 for the support plate and the small support block 4 for the support plate close to the inner casing; and the surfaces of the large support block 3 for the support plate and the small support block 4 for the support plate close to the inner casing are chrome-plated, which can ensure the forming effect of the weld seam and avoid adhesion.

[0022] In this embodiment, it further includes a support shaft 5 and a tooling bracket 7; the tooling bracket 7 is arranged on the assembly platform; the support shaft 5 is erected on the top of the tooling bracket 7, and the support shaft 5 can rotate freely about its axis; the support shaft 5 passes through the positioning tooling plate 1 and the support plate 2 to lift the engine exhaust casing, thus facilitating the welding operation.

[0023] In this embodiment, the outer end face of the support plate 2 is flush with the outer end face of the inner casing; the support plate 2 is fixedly connected to the inner casing by a first pressing plate 8 and a first screw 14.

[0024] In this embodiment, a plurality of outer casing fixing plates 24 extend from the outer edge of the positioning tooling plate 1; the outer casing fixing plates 24 are fixedly connected to the outer casing by a third pressing plate 10 and outer casing screws.

[0025] This embodiment also provides a method for assembling and welding the casing, based on Embodiment 1 of the above-mentioned engine exhaust casing assembly and welding component, including the following steps: S1. Screw and fix the support plate 2 to one side end face of the inner casing 25. S2. As shown in Figure 6 , on the assembly platform, pad up the inner casing 25 assembled in step S1 with equal-height pads, avoiding the first pressing plate 8 and the first screw 14. Place the outer casing 26 with its small end down and pad it up with equal-height pads of the same height. After placing, adjust the reference holes of the inner casing 25 and the outer casing 26 to the positions shown in the D-direction view; after adjustment, sequentially assemble the large support plate 27 and the small support plate 28 between the inner casing and the outer casing from the inner hole side of the inner casing; assemble a plug 20 on the large support plate 27 and fix it with a hexagon head bolt; install bolts, lock washers 21 and small support plate positioning pins 22 on the small support plate 28; do not tighten each bolt temporarily. S3. Install the large support plate support block 3 and the small support plate support block 4 on the support plate 2 and attach them to the inner wall of the inner casing; during assembly, use a feeler gauge to check the gap between the large support plate support block 3 and the inner wall of the inner casing and the gap between the small support plate support block 4 and the inner wall of the inner casing, and require that it is not allowed to be 0.04. S4. Assemble the positioning tooling plate 1 to the other side end face of the casing, that is, the large end of the inner casing and the outer casing; use a cylindrical pin 13 to position the angular position, and use a spigot to position the circumferential position of the inner casing and the outer casing. After assembly, fix the inner casing 25 to the positioning tooling plate 1 with a second pressing plate 9, and fix the outer casing 26 to the positioning tooling plate 1 with a third pressing plate 10. S5. Tighten all the bolts and pins used for installing the large support plate and the small support plate; specifically, the tightening torque of the bolts is 6.1 - 8.3 N·m; the tightening torque of the pins is 14.1 - 19.3 N·m. S6. As shown in Figure 2 and Figure 3As shown, lift and suspend the casing and its assembly in a vertical position, insert the support shaft 5 into the central holes of the positioning tooling plate 1 and the support plate 2, and mount the support shaft 5 on the tooling bracket 7; S7. Clean the position to be welded with anhydrous ethanol, and weld the large support plate, small support plate and inner casing.

[0026] Specifically, when welding the large support plate, small support plate and inner casing, it includes: A1. First, use spot welding for positioning, fix each large support plate and small support plate to the inner casing and outer casing. The spot welding spacing is not greater than 30 mm, and when spot welding, use the method of welding diagonally in sequence; A2. Adopt I-shaped butt welds to weld the large support plate and small support plate. The welding sequence is to weld the large support plate first and then the small support plate, and when welding, use the diagonal method in sequence; Further, after welding every 5 large support plates or small support plates, cool down; Optionally, use the method of wet towel plus fan blowing to cool down; A3. Adopt I-shaped butt welds to weld the static pressure test nozzle.

[0027] Further, when welding the large support plate 27, small support plate 28 and inner casing 25, use argon arc welding for welding. The welding consumable is GH3536, the wire diameter of the welding wire is 1.2 mm, the welding current is 50 - 75 A, the arc voltage is 10 - 12 V, and the argon gas flow rate is 10 - 15 L / min.

[0028] This embodiment has the following advantages: (1) High-precision positioning and deformation control: Through the double-end fixed design of the support plate 2 and the positioning tooling plate 1, combined with the wall-attached support of the inner casing 25 by the large support plate support block 3 and the small support plate support block 4, the welding thermal deformation of the inner casing 25 is effectively restricted; (2) The cooperation of the support shaft 5 and the tooling bracket 7 enables the casing to rotate around the axis, realizing multi-angle welding operations and reducing the manual adjustment time; (3) Improvement of weld quality: The surface chromium plating treatment and the forming groove 19 design of the large support plate support block 3 and the small support plate support block 4 avoid metal adhesion during welding and optimize the weld forming effect at the same time; (4) Using argon arc welding and adopting a step-by-step welding strategy, combined with diagonal spot welding and segmented cooling (wet towel + fan), significantly reduces the deformation caused by thermal stress concentration; (5) Optimization of assembly efficiency, simplifying the positioning process of the inner casing and outer casing; Tighten the bolts and pins step by step to ensure the assembly stability while avoiding overload deformation; (6) The special materials and surface treatment processes of the large support plate support block 3 and the small support plate support block 4 improve the service life of the welding components and reduce the maintenance cost.

[0029] The structures, functions, and connection forms disclosed in this document can be implemented in other ways. For example, the embodiments described above are merely illustrative. For example, the positioning tooling plate can have other installation methods. For example, multiple components can be combined or integrated into another component. Additionally, in each of the embodiments in this document, the various functional components can be integrated into one functional component, or each functional component can exist physically separately, or two or more functional components can be integrated into one functional component.

[0030] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments. Instead, it can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in related fields. As long as the changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, they should all be within the protection scope of the appended claims of the present invention.

Claims

1. An engine exhaust case assembly welding component, the engine exhaust case comprising an inner case, an outer case, a large support plate and a small support plate, characterized in that: The assembly and welding component includes a positioning tooling plate (1), a support plate (2), a large support block for the support plate (3) and a small support block for the support plate (4). The support plate (2) is connected to one side end face of the inner casing; the positioning tooling plate (1) is installed on the other side end face of the inner casing, and the positioning tooling plate (1) is also connected to the outer casing. Both the large support block for the support plate (3) and the small support block for the support plate (4) are installed on the support plate (2) by screwing, and are attached to the inner wall of the inner casing to control welding deformation; the large support block for the support plate (3) is arranged at the joint of the large support plate; the small support block for the support plate (4) is arranged at the joint of the small support plate.

2. The assembly welding component of an engine exhaust casing according to claim 1, wherein: The large support block for the support plate (3) and the small support block for the support plate (4) are made of stainless steel; a forming groove (19) is formed on the side of the large support block for the support plate (3) and the small support block for the support plate (4) close to the inner casing; and the surfaces of the large support block for the support plate (3) and the small support block for the support plate (4) close to the inner casing are chrome-plated, which can ensure the forming effect of the weld seam and avoid adhesion.

3. A welding assembly for an engine exhaust casing according to claim 1, characterized in that: It further includes a support shaft (5) and a tooling bracket (7); the tooling bracket (7) is arranged on the assembly platform; the support shaft (5) is erected on the top of the tooling bracket (7), and the support shaft (5) can rotate around its own axis; the support shaft (5) passes through the positioning tooling plate (1) and the support plate (2) to lift the engine exhaust casing, so as to facilitate the welding operation.

4. The assembled and welded component of an engine exhaust casing according to claim 1, wherein: The outer end face of the support plate (2) is flush with the outer end face of the inner casing; the support plate (2) is fixedly connected to the inner casing through a first pressing plate (8) and a first screw (14).

5. The assembly welding component of an engine exhaust casing according to claim 1, wherein: A plurality of outer casing fixing plates (24) extend from the outer edge of the positioning tooling plate (1); the outer casing fixing plates (24) are fixedly connected to the outer casing through a third pressing plate (10) and an outer casing screw.

6. A method for assembling and welding a casing, based on the engine exhaust casing assembly and welding component according to any one of claims 1-5, It is characterized in that: including the following steps: S1. Screw and fix the support plate (2) to one side end face of the inner casing. S2. Assemble the large support plate and the small support plate from the inner hole side of the inner casing into the space between the inner casing and the outer casing in sequence. S3. Install the large support block for the support plate (3) and the small support block for the support plate (4) on the support plate (2) and attach them to the inner wall of the inner casing. S4. Assemble the positioning tooling plate (1) to the other side end face of the casing, fix the inner casing to the positioning tooling plate (1) with a second pressing plate (9), and fix the outer casing to the positioning tooling plate (1) with a third pressing plate (10). S5. Tighten all the bolts and pins for installing the large support plate and the small support plate. S6. Lift and stand the casing and its fittings on their sides, insert the support shaft (5) into the central holes of the positioning tooling plate (1) and the support plate (2), and erect the support shaft (5) on the tooling bracket (7). S7. Weld the large support plate, the small support plate and the inner casing.

7. A casings assembly and welding method according to claim 6, wherein: When welding the large support plate, the small support plate and the inner casing, it includes: A1. First, use spot welding for positioning to fix each large support plate and small support plate to the inner casing and the outer casing. The spot welding spacing is not greater than 30 mm, and when spot welding, the diagonal welding method is used in sequence. A2. Use type I butt welds to weld the large support plate and the small support plate. The welding sequence is to weld the large support plate first and then the small support plate. When welding, use the diagonal method in turn; A3. Use type I butt welds to weld the static pressure test nozzle.

8. A casing assembly and welding method according to claim 6, characterized in that: When welding the large support plate, the small support plate and the inner casing, use argon arc welding. The welding consumables are GH3536, the wire diameter is 1.2 mm, the welding current is 50 - 75 A, the arc voltage is 10 - 12 V, and the argon gas flow rate is 10 - 15 L / min.

Images