Protection clamp and method for rectification bearing casing boss welding

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a protection clamp and method for rectification bearing casing boss welding. The protection clamp comprises a bottom plate, a supporting vertical plate, an air pipe seat, an air conveying pipe and a welding protection cover. The supporting vertical plate is vertically installed on the bottom plate, and the air pipe base is installed on the supporting vertical plate. The gas conveying pipe is horizontally arranged on the gas pipe seat, the gas inlet end is provided with a gas nozzle, and the gas outlet end is provided with a welding protective cover; the welding protection cover is provided with an open air storage cavity, and the open end of the open air storage cavity is an inclined face to be attached to the peripheral face of the fairing. A supporting pin is arranged at the air outlet end of the air conveying pipe and used for penetrating through the fairing through hole and being inserted into the boss center hole. During welding, the convex seat is accurately positioned through the supporting pin, and meanwhile argon is introduced into the protective cover to form a protective atmosphere. The problems of inaccurate positioning and welding seam oxidation in the convex seat welding process are effectively solved, and the welding quality and the product percent of pass are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine manufacturing technology, and in particular to a protective fixture and method for welding the rectifier support casing boss. Background Technology

[0002] The rectifier support casing serves as the engine base, providing rigid support for components such as the compressor stator, combustion chamber, and turbine, ensuring the concentricity and axial positioning accuracy of each engine component.

[0003] The fairing of the rectifier support casing requires welding of bosses, which are welded to the inner wall of the fairing. These bosses serve to fix and limit the fairing, and withstand high mechanical loads.

[0004] However, due to interference between the mounting edge and support plate on the rectifier support casing, it is difficult to provide gas protection for the weld, resulting in the fairing being prone to deformation at the weld location after welding. Furthermore, during welding, because the boss is located within the acute angle area formed by the mounting edge and the annular fairing, it is difficult to effectively support the boss, causing it to easily shift. Consequently, the center hole on the boss cannot be aligned with the corresponding through hole on the fairing after welding.

[0005] Although there are existing technologies related to welding of rectifier support casings, such as the patent application with publication number CN110732750A which discloses a welding fixture and welding method for rectifier support casings.

[0006] However, the aforementioned prior art does not disclose how to provide gas protection and support for the boss during welding, which fails to solve the problem that the fairing is prone to deformation at the weld position after welding. It also does not disclose how to support the boss to ensure that the center hole on the boss is aligned with the corresponding through hole on the fairing after welding. Summary of the Invention

[0007] The main objective of this invention is to provide a protective fixture and method for welding the boss of the rectifier support casing, thereby solving the aforementioned technical problems.

[0008] To achieve the above objectives, on the one hand, the present invention proposes a protective fixture for welding the boss of a rectifier support casing, comprising a base plate, a support vertical plate, an air pipe seat, an air supply pipe, and a welding protective cover; the support vertical plate is vertically mounted on the top surface of the base plate, providing support for the entire fixture; the air pipe seat is mounted on the support vertical plate; a height adjustment mechanism is provided on the support vertical plate for adjusting the height position of the air pipe seat to accommodate rectifier support casings of different sizes; the air supply pipe is horizontally inserted into the air pipe seat, and the air supply pipe... The inlet end is equipped with a nozzle for connecting to the argon gas supply pipe to introduce protective gas. The welding protective cover is fitted onto the outlet end of the gas supply pipe and has an open gas storage chamber. The open end of the welding protective cover is designed with an inclined surface to fit against the outer circumferential surface of the fairing, ensuring that the protective gas can cover the weld area. A support pin is installed at the outlet end of the gas supply pipe, which passes through the through hole on the fairing and is inserted into the center hole of the boss to be welded, thereby precisely fixing the position of the boss.

[0009] Preferably, a first inverted U-shaped groove is provided on the support vertical plate. The first inverted U-shaped groove is used to make way for the support plate on the rectifier support casing to avoid interference.

[0010] Preferably, a second inverted U-shaped groove is provided on the support vertical plate, and the second inverted U-shaped groove is located at the top of the first inverted U-shaped groove; sliding grooves are provided at both ends of the air tube seat; the air tube seat is installed in the first inverted U-shaped groove, and the sliding groove is engaged with the side walls of the first inverted U-shaped groove to form a sliding fit; a tightening screw is screwed on the support vertical plate to tighten the air tube seat, and when the height of the air tube seat is adjusted to the correct position, the tightening screw is used to tighten the air tube seat.

[0011] Preferably, the height adjustment mechanism includes a screw and a handle; the screw is vertically screwed into a threaded hole in the crossbeam at the upper part of the support vertical plate; the lower end of the screw is connected to the trachea seat; the handle is horizontally inserted into the top end of the screw, and the height of the trachea seat can be adjusted by rotating the handle.

[0012] Preferably, a clamp is provided at the lower end of the screw; a T-slot is provided on the air tube seat; the clamp is rotatably fitted into the T-slot, so that when the screw rotates, it can drive the air tube seat to move up and down, while allowing the screw to rotate but the air tube seat not to rotate.

[0013] Preferably, an annular platform is integrally formed on the outer circumferential surface of the gas pipe; a limiting countersunk hole is provided on the gas pipe seat, and the annular platform is embedded in the limiting countersunk hole. This provides axial limiting for the gas pipe, thereby fixing the position of the gas pipe.

[0014] Preferably, a disc-shaped body is integrally formed on the outer peripheral surface of the support pin, and the disc-shaped body is interference-fitted with the inner hole of the gas outlet end of the gas supply pipe; multiple vent holes are formed on the disc-shaped body to allow protective gas to pass through the vent holes and enter the gas storage chamber of the welding protective cover.

[0015] Preferably, the end of the cantilever of the support pin is set as a tapered head to serve as a guide, facilitating its passage through the fairing and insertion into the center hole of the boss.

[0016] Preferably, the air inlet end of the air supply pipe is bent upwards, so that the air supply pipe forms an L shape. This is convenient for connecting to the air source and also facilitates the air supply pipe to make way for the support plate on the rectifier support casing, thus avoiding interference.

[0017] Secondly, the present invention proposes a method for welding the boss of a rectifier support casing, using the aforementioned protective fixture, and comprising the following steps: S1. Place the rectifier support housing and protective fixture on the welding workbench, and connect the argon gas supply pipe to the gas nozzle on the gas delivery pipe. S2. Move the protective clamp on the welding worktable so that the welding protective cover is close to the rectifier cover of the rectifier support casing. Adjust the height of the gas pipe seat so that the axis of the support pin is aligned with the axis of the through hole on the rectifier cover. S3. Continue to push the protective clamp on the welding worktable so that the support pin passes through the through hole on the fairing and the bevel of the open end of the welding protective cover fits against the outer circumferential surface of the fairing. S4. Place the boss to be welded onto the support pin, ensuring that the boss contacts the inner wall surface of the fairing. S5. Turn on the argon gas source and supply argon gas to the welding protective cover. After the air in the cavity of the welding protective cover is purged, argon gas protection is formed on the back side of the weld location, and then the boss can be welded.

[0018] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) By setting up a welding protective cover and a gas supply pipe, the back of the weld can be protected by argon gas, reducing welding deformation and improving weld quality.

[0019] (2) By precisely inserting the support pin into the through hole of the fairing and the center hole of the boss, the position of the boss can be effectively fixed, preventing the boss from shifting during the welding process, and ensuring the alignment accuracy between the center hole of the boss and the through hole of the fairing after welding.

[0020] (3) The sliding design of the height adjustment mechanism and the air tube seat facilitates the adjustment of the height of the air tube seat, thereby aligning the axis of the support pin with the axis of the through hole on the fairing. At the same time, the sliding design of the height adjustment mechanism and the air tube seat allows the fixture to adapt to fairing support housings of different sizes, improving the versatility and flexibility of the fixture.

[0021] (4) The inverted U-shaped groove design on the support plate avoids interference with the support plate on the rectifier support casing, ensuring that the fixture can smoothly approach the welding position.

[0022] (5) The entire fixture has a simple structure and is easy to operate, which can significantly improve welding efficiency and product quality and reduce scrap rate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a front view of the protective clamp provided by the present invention; Figure 2 for Figure 1 BB section view; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is the front view of the tracheal conduit; Figure 5 This is a top view of the tracheal conduit; Figure 6 A schematic diagram showing the structure for supporting the pin and the gas pipeline.

[0025] Explanation of reference numerals: 1. Supporting vertical plate; 1a. First inverted U-shaped groove; 1b. Second inverted U-shaped groove; 2. Air pipe seat; 2a. Slide groove; 2b. T-slot; 2c. Limiting countersunk hole; 3. Screw; 3a. Clamp; 4. Air supply pipe; 4a. Annular platform; 5. Air nozzle; 6. Welding protective cover; 7. Tightening screw; 8. Base plate; 9. Support pin; 9a. Disc-shaped body; 9b. Vent hole; 9c. Conical head; 10. Handle; 100. Fairing; 200. Thrust; 300. Support plate. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] As shown in the accompanying drawings, this embodiment provides a protective fixture for welding the boss of the rectifier support casing, which mainly includes a base plate 8, a support vertical plate 1, a gas pipe seat 2, a gas supply pipe 4, and a welding protective cover 6.

[0030] The base plate 8 forms the foundation of the entire fixture and is typically made of metal sheet, providing sufficient rigidity and stability to ensure the fixture remains stable during welding. The support vertical plate 1 is vertically mounted on the top surface of the base plate 8 and can be fixed by welding or bolting. The support vertical plate 1 serves to support the air pipe seat 2 and other components.

[0031] A first inverted U-shaped groove 1a and a second inverted U-shaped groove 1b are provided on the support vertical plate 1. The first inverted U-shaped groove 1a is used to make way for the support plate 300 on the rectifier support casing, that is, the support plate 300 can pass through the first inverted U-shaped groove 1a, avoiding interference when the clamp approaches the rectifier 100. The second inverted U-shaped groove 1b is located at the top of the first inverted U-shaped groove 1a, which is used to reduce the weight of the support vertical plate 1 and is also used to install the air pipe seat 2.

[0032] The tracheal tube seat 2 is mounted on the supporting vertical plate 1. Specifically, the tracheal tube seat 2 is disposed within the first inverted U-shaped groove 1a. Sliding grooves 2a are respectively provided at both ends of the tracheal tube seat 2. The sliding grooves 2a engage with the side walls of the first inverted U-shaped groove 1a, forming a sliding fit, allowing the tracheal tube seat 2 to slide up and down within the first inverted U-shaped groove 1a. A tightening screw 7 is screwed onto the supporting vertical plate 1. After the tracheal tube seat 2 is adjusted to a suitable position, tightening the tightening screw 7 can fix the tracheal tube seat 2 and prevent it from moving.

[0033] To adjust the height of the tracheal tube seat 2, a height adjustment mechanism is provided on the supporting vertical plate 1. The height adjustment mechanism includes a screw 3 and a handle 10. The screw 3 is vertically screwed into a threaded hole in the crossbeam at the upper part of the supporting vertical plate 1. The lower end of the screw 3 is connected to the tracheal tube seat 2. Specifically, a locking head 3a is provided at the lower end of the screw 3, and a T-slot 2b is provided on the tracheal tube seat 2. The locking head 3a is rotatably engaged in the T-slot 2b. Thus, when the handle 10 is turned, the screw 3 rotates. Since the locking head 3a can rotate but cannot move up and down within the T-slot 2b, the rotation of the screw 3 is converted into the up and down movement of the tracheal tube seat 2, thereby achieving height adjustment.

[0034] The gas supply pipe 4 is horizontally inserted into the gas pipe seat 2. An annular platform 4a is integrally formed on the outer circumference of the gas supply pipe 4. A limiting countersunk hole 2c is provided on the gas pipe seat 2. The annular platform 4a is fitted into the limiting countersunk hole 2c with an interference fit, thereby axially limiting the gas supply pipe 4 and preventing its axial movement. The inlet end of the gas supply pipe 4 is bent upwards to form an L-shape, which facilitates connection to the gas source and allows for clearance with the flange at the end of the support plate 300. A gas nozzle 5 is provided at the inlet end of the gas supply pipe 4, which is used to connect to the gas supply pipe of the argon gas source.

[0035] The welding protective cover 6 is fitted onto the outlet end of the gas supply pipe 4. The welding protective cover 6 is typically made of high-temperature resistant materials, such as stainless steel or ceramic. An open-shaped gas storage chamber is provided on the welding protective cover 6 for storing and protecting the gas. The open end of the welding protective cover 6 is designed with an inclined slope to fit snugly against the outer circumferential surface of the fairing 100, ensuring that the protective gas can cover the back surface area of ​​the weld.

[0036] A support pin 9 is installed at the outlet end of the gas supply pipe 4. The support pin 9 is used to pass through the through hole on the fairing 100 and be inserted into the central hole of the boss 200 to be welded. A disc-shaped body 9a is integrally formed on the outer peripheral surface of the support pin 9. The disc-shaped body 9a is press-fitted with the inner hole of the outlet end of the gas supply pipe 4 to fix the support pin 9. Multiple vent holes 9b are provided on the disc-shaped body 9a to allow protective gas to flow from the gas supply pipe 4 into the welding protective cover 6. The cantilever end of the support pin 9 is set with a tapered head 9c, which serves as a guide to facilitate passing through the through hole on the fairing 100 and being inserted into the central hole of the boss 200.

[0037] Secondly, this embodiment provides a method for welding the boss of the rectifier support casing, using the above-mentioned protective fixture, and includes the following steps: S1. Place the rectifier support housing and protective fixture on the welding workbench. The rectifier support housing usually includes structures such as rectifier cover 100 and support plate 300, and connect the gas supply pipe of the argon gas source to the gas nozzle 5 on the gas transmission pipe 4.

[0038] S2. Move the protective clamp on the welding worktable so that the welding protective cover 6 is close to the rectifier cover 100 of the rectifier support casing. Adjust the height of the air pipe seat 2 by turning the handle 10 so that the axis of the support pin 9 is aligned with the axis of the through hole on the rectifier cover 100. After adjustment, tighten the top screw 7 to tighten the air pipe seat 2.

[0039] S3. Continue to push the protective clamp on the welding worktable so that the support pin 9 passes through the through hole on the fairing 100 and the inclined surface of the open end of the welding protective cover 6 is attached to the outer peripheral surface of the fairing 100; at this time, the end of the cantilever of the support pin 9 extends out of the inner wall surface of the fairing 100.

[0040] S4. Place the boss 200 to be welded onto the support pin 9, so that the boss 200 contacts the inner wall surface of the fairing 100. The tapered head 9c of the support pin 9 serves as a guide, facilitating insertion into the center hole of the boss 200.

[0041] S5. Turn on the argon gas source and supply argon gas to the welding protective cover 6. The argon gas enters the gas storage chamber of the welding protective cover 6 through the gas supply pipe 4 and the vent hole 9b, purging the air in the chamber. The argon gas covers the back of the weld position, forming a protective atmosphere. At this time, the boss 200 can be welded, such as using the TIG welding method.

[0042] After welding is completed, turn off the argon gas source, remove the protective clamps, and take out the welded casing.

[0043] This invention provides stable gas protection and precise positioning through a protective fixture, effectively solving the problems of welding deformation and displacement of the convex seat 200, and improving welding quality and efficiency.

[0044] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A protective clamp for welding the boss of a rectifier support casing, characterized in that, It includes a base plate (8), a supporting vertical plate (1), a gas pipe seat (2), a gas supply pipe (4), and a welding protective cover (6); The supporting vertical plate (1) is vertically installed on the top surface of the base plate (8); The tracheal tube seat (2) is installed on the support vertical plate (1); a height adjustment mechanism is provided on the support vertical plate (1) for adjusting the height position of the tracheal tube seat (2); The gas supply pipe (4) is horizontally inserted on the gas pipe seat (2), and a gas nozzle (5) is provided at the gas inlet end of the gas supply pipe (4). The gas nozzle (5) is used to connect to the gas supply pipe of the argon gas source. The welding protective cover (6) is fitted onto the outlet end of the gas supply pipe (4), and an open-shaped gas storage cavity is provided on the welding protective cover (6); the open end of the welding protective cover (6) is set as an inclined slope for fitting onto the outer circumferential surface of the fairing (100). A support pin (9) is installed at the outlet end of the gas pipe (4) to pass through the through hole on the fairing (100) and be inserted into the center hole of the boss (200) to be welded.

2. The protective clamp according to claim 1, characterized in that, A first inverted U-shaped groove (1a) is provided on the support vertical plate (1), which is used to make way for the support plate (300) on the rectifier support casing.

3. The protective clamp according to claim 2, characterized in that, A second inverted U-shaped groove (1b) is provided on the support vertical plate (1), and the second inverted U-shaped groove (1b) is located at the top of the first inverted U-shaped groove (1a); Sliding grooves (2a) are provided at both ends of the tracheal seat (2); the tracheal seat (2) is installed in the first inverted U-shaped groove (1a), and the sliding grooves (2a) are engaged with the side walls of the first inverted U-shaped groove (1a) to form a sliding fit; A tightening screw (7) is screwed onto the support vertical plate (1) to tighten the air tube seat (2).

4. The protective clamp according to claim 1, characterized in that, The height adjustment mechanism includes a screw (3) and a handle (10); the screw (3) is vertically screwed into the threaded hole of the crossbeam on the upper part of the supporting vertical plate (1); the lower end of the screw (3) is connected to the air tube seat (2); the handle (10) is horizontally inserted into the top end of the screw (3).

5. The protective clamp according to claim 4, characterized in that, A clamp (3a) is provided at the lower end of the screw (3); a T-slot (2b) is provided on the air tube seat (2); the clamp (3a) is rotatably fitted into the T-slot (2b).

6. The protective clamp according to claim 1, characterized in that, An annular platform (4a) is integrally formed on the outer circumferential surface of the gas pipe (4); a limiting countersunk hole (2c) is provided on the gas pipe seat (2), and the annular platform (4a) is embedded in the limiting countersunk hole (2c).

7. The protective clamp according to claim 1, characterized in that, A disc-shaped body (9a) is integrally formed on the outer peripheral surface of the support pin (9), and the disc-shaped body (9a) is interference-fitted with the inner hole of the air outlet end of the air pipe (4); a plurality of air holes (9b) are provided on the disc-shaped body (9a).

8. The protective clamp according to claim 1, characterized in that, The end of the cantilever of the support pin (9) is set as a tapered head (9c).

9. The protective clamp according to claim 1, characterized in that, The air inlet end of the gas pipe (4) is bent upwards, so that the gas pipe (4) forms an L shape.

10. A method for welding a boss in a rectifier support casing, characterized in that, The protective clamp according to any one of claims 1 to 9 comprises the following steps: S1. Place the rectifier support housing and protective fixture on the welding workbench, and connect the gas supply pipe of the argon gas source to the gas nozzle (5) on the gas transmission pipe (4); S2. Push the protective clamp to move on the welding workbench so that the welding protective cover (6) is close to the rectifier cover (100) of the rectifier support casing. Adjust the height of the gas pipe seat (2) so that the axis of the support pin (9) is aligned with the axis of the through hole on the rectifier cover (100). S3. Continue to push the protective clamp on the welding workbench so that the support pin (9) passes through the through hole on the fairing (100) and the bevel of the open end of the welding protective cover (6) fits against the outer circumferential surface of the fairing (100). S4. Place the boss (200) to be welded onto the support pin (9) and make the boss (200) contact the inner wall surface of the fairing (100); S5. Turn on the argon gas source and supply argon gas to the welding protective cover (6). After the air in the cavity of the welding protective cover (6) is exhausted, argon gas protection is formed on the back side of the weld location, and then the boss (200) can be welded.

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