Argon arc welding gas protection device and method for aero-engine mixer lobe

Abstract

The invention relates to the field of aero-engine manufacturing, in particular to an argon arc welding gas protection device and method for aero-engine mixer lobes. The device comprises a shell used for being inserted into a lobe groove of a lobe part. A pore plate is arranged in an inner cavity of the shell, and vent holes are formed in the pore plate; a gas storage chamber is formed between the pore plate and the bottom plate; the pore plate, the bottom plate, the upper plate body and the two side panels jointly define an open gas protection chamber; the two ends of the lower plate body extend outwards and are vertically bent upwards to form clamping hook plates, a pipe connector is arranged on the lower plate body, and the pipe connector is communicated with the air storage cavity. When the protective gas device is used, the shell is inserted into a lobe groove of a lobe part in an inserting mode, the clamping hook plates on the two sides of the lower plate body are used for being clamped on the lobe side walls on the two sides of the lobe groove respectively, the whole device can be fixed to the lobe part, and the protective gas device does not need to be manually moved on the back face.

Description

Technical Field

[0001] The invention relates to the field of aeroengine manufacturing, and in particular to a argon arc welding gas protection device and method for aeroengine mixer lobes. Background Art

[0002] like Figure 1 The following is a partial structural diagram of the mixer lobe parts of an aircraft engine. When manufacturing the lobe parts, manual argon arc welding is required. At present, in the process of manual argon arc welding of the lobe parts on site, inert gas protection is required on the back of the weld to form a high-quality single-sided and double-sided weld. Figure 1 As shown in A.

[0003] However, when a welder is operating the welding process from the front, an additional assistant is required on site to move the gas shielding device on the back of the weld. The assistant moving the gas shielding device from behind causes unnecessary labor consumption and increases product production costs. On the other hand, when the shielding gas device is moved manually, the curvature of the lobe often causes poor inert gas protection during the movement of the shielding gas device, affecting the quality of the weld. The fluctuating back shielding gas flow rate and the gas pressure in the inner cavity of the shielding device affect the forming quality of the back weld. Summary of the invention

[0004] The main purpose of the present invention is to provide a argon arc welding gas protection device and method for aircraft engine mixer lobes, aiming to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, on the one hand, the present invention proposes an argon arc welding gas protection device for aircraft engine mixer lobes, comprising a shell for being inserted into the lobe groove of the lobe part; the shell is a hollow shell formed by a bottom plate, an upper plate body, a lower plate body and two side panels, a orifice plate is arranged in the inner cavity of the shell, and a vent is arranged on the orifice plate; an air storage chamber is formed between the orifice plate and the bottom plate; the orifice plate and the bottom plate, the upper plate body, and the two side panels together form an open gas protection chamber; the two ends of the lower plate body extend outward and are vertically bent upward to form a hook plate, and a pipe joint is arranged on the lower plate body, and the pipe joint is connected to the air storage chamber.

[0006] Preferably, the mouth contour of the gas protection chamber fits the groove bottom of the lobe groove.

[0007] Preferably, the lower portion of the orifice plate is set as a first through hole area, and the middle and upper portions of the orifice plate are set as a second through hole area; the diameter of the vents in the first through hole area is smaller than the diameter of the vents in the second through hole area.

[0008] Preferably, in the second through hole region, the diameters of the vent holes in the second through hole region increase row by row along a direction away from the pipe joint.

[0009] Preferably, the number of ventilation holes included in each row in the first through hole region is n1; the number of ventilation holes included in each row in the second through hole region is n2, wherein n1>n2.

[0010] Preferably, the width of the shell is T, satisfying: t+0.5mm≤T≤t+2.0mm; wherein t is the width of the lobe groove mouth on the lobe part.

[0011] Preferably, the shell and the orifice plate are made of high-temperature alloy GH3128.

[0012] On the other hand, the present invention also provides a argon arc welding gas protection method for an aircraft engine mixer lobe, using the above-mentioned argon arc welding gas protection device, comprising the following steps:

[0013] S1. Install the lobe parts on the welding tooling;

[0014] S2. Insert the shell of the argon arc welding gas protection device into the lobe groove of the lobe part, so that the mouth contour of the gas protection chamber of the argon arc welding gas protection device fits with the bottom of the lobe groove on the lobe part, and the hook plates on both sides of the lower plate body are respectively clamped on the lobe side walls on both sides of the lobe groove;

[0015] S3. Connect the argon tank to the pipe joint through the air pipe, and introduce argon into the gas storage chamber. The argon enters the gas protection chamber from the air holes on the orifice plate to protect the bottom of the lobe groove.

[0016] S4. Weld the lobes on the lobe parts.

[0017] Preferably, in step S4, after welding is completed, only the gas pipe on the pipe joint is unplugged and the argon supply is stopped, and the argon arc welding gas protection device remains in the lobe groove of the lobe part, and the argon arc welding gas protection device is removed after complete cooling.

[0018] Preferably, when argon gas is introduced for protection, the pipe joint is always facing downwards and the shell is always facing upwards.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] (1) When using the argon arc welding gas protection device provided by the present invention, the shell is inserted into the lobe groove of the lobe part by plugging, and the hook plates on both sides of the lower plate body are respectively clamped on the lobe side walls on both sides of the lobe groove. The whole device can be fixed on the lobe part without manual movement of the protection gas device on the back side, so that the protection gas flow rate and the gas pressure in the gas protection chamber are stable, thereby ensuring the forming quality of the back weld.

[0021] (2) The argon arc welding gas protection device provided by the present invention forms an easily pluggable structure with the lobe parts, and no auxiliary personnel are required during welding, which can significantly improve the production efficiency of lobe welding.

[0022] (3) When the argon arc welding gas protection device provided by the present invention is used, and the mouth contour of the gas protection chamber of the argon arc welding gas protection device is in contact with the bottom of the lobe groove on the lobe part, the inert gas completely wraps the entire back of the weld. During the entire welding process, only one welder is required to focus on the welding process, and no additional auxiliary personnel are required to participate in the welding process. In addition, the uniform and stable inert gas state can not only ensure a good inert gas protection effect, but also promote the formation of the back of the weld. Furthermore, the use of this device can also reduce the consumption of inert gas.

[0023] (4) In the present invention, the shell and the orifice plate are made of high-temperature alloy GH3128. Since GH3128 is resistant to high temperatures, it can be used as the main material of the argon arc welding gas protection device to ensure that the device will not be deformed or twisted due to heat radiation or heat conduction during long-term welding, thereby ensuring the good protection effect of the inert gas on the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a partial structural schematic diagram of the mixer lobe parts of an aircraft engine;

[0026] Figure 2 This is a schematic diagram of the structure of the argon arc welding gas protection device provided by the present invention, in which the arrows indicate the direction of the gas flow;

[0027] Figure 3 for Figure 2 Section view along AA.

[0028] Explanation of the accompanying drawings: 1. Shell; 1a. Side panel; 1b. Bottom plate; 1c. Upper plate; 1d. Lower plate; 1e. Hook plate; 2. Orifice plate; 2a. Air vent; 2b. First through hole area; 2c. Second through hole area; 3. Gas storage chamber; 4. Gas protection chamber; 5. Pipe joint; D. Mouth contour of the gas protection chamber. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Combination Figures 1 to 3 As shown, a argon arc welding gas protection device for aircraft engine mixer lobes comprises an inner shell 1 for being inserted into a lobe groove 101 of a lobe part 100; the shell 1 is a hollow shell formed by a bottom plate 1b, an upper plate 1c, a lower plate 1d and two side panels 1a, a hole plate 2 is arranged in the inner cavity of the shell 1, and a vent 2a is arranged on the hole plate 2; a gas storage chamber 3 is formed between the hole plate 2 and the bottom plate 1b; the hole plate 2 and the bottom plate 1b, the upper plate 1c, and the two side panels 1a together form an open gas protection chamber 4; the two ends of the lower plate 1d extend outward and are vertically bent upward to form a hook plate 1e, a pipe joint 5 is arranged on the lower plate 1d, the pipe joint 5 is connected to the gas storage chamber 3, and the mouth contour D of the gas protection chamber 4 fits with the groove bottom of the lobe groove 101.

[0033] Combination Figure 2 As shown, the lower part of the orifice plate 2 is set as the first through hole area 2b, and the middle and upper parts of the orifice plate 2 are set as the second through hole area 2c; the diameter of the vent 2a in the first through hole area 2b is smaller than the diameter of the vent 2a in the second through hole area 2c. Specifically, in the second through hole area 2c, along the direction away from the pipe joint 5, the diameter of the vent 2a in the second through hole area 2c increases row by row. The number of vents 2a contained in each row in the first through hole area 2b is n1; the number of vents 2a contained in each row in the second through hole area 2c is n2, where n1>n2. Through this structural design, the argon gas in the gas storage chamber 3 can be uniformly passed through the orifice plate 2 into the gas protection chamber 4. Therefore, during the weld protection process, the inert gas always uniformly fills the inside of the gas protection chamber 4 and plays a good gas protection effect.

[0034] Combination Figure 1 , Figure 3 As shown, the width of the housing 1 is T, which satisfies: t+0.5mm≤T≤t+2.0mm; the lobe groove 101 is a closed structure, and t is the width of the lobe groove 101 mouth on the lobe part 100. By adopting this structure, it is ensured that the housing 1 can be inserted into the lobe groove 101 and will not fall from the mouth of the lobe groove 101.

[0035] In this embodiment, the shell 1 and the orifice plate 2 are made of high temperature alloy GH3128. Since GH3128 is resistant to high temperatures, it can be used as the main material of the argon arc welding gas protection device to ensure that the device will not be deformed or twisted due to heat radiation or heat conduction during long-term welding, thereby ensuring a good protective effect of the inert gas on the weld.

[0036] On the other hand, this embodiment also provides a argon arc welding gas protection method for an aircraft engine mixer lobe, using the above-mentioned argon arc welding gas protection device, comprising the following steps:

[0037] S1. Install the lobe component 100 on a welding tool;

[0038] S2, inserting the housing 1 of the argon arc welding gas protection device into the lobe groove 101 of the lobe part 100, so that the mouth contour of the gas protection chamber 4 of the argon arc welding gas protection device fits with the groove bottom of the lobe groove 101 on the lobe part 100, and the hook plates 1e on both sides of the lower plate body 1d are respectively clamped on the lobe side walls 102 on both sides of the lobe groove 101;

[0039] S3, connect the argon tank to the pipe joint 5 through the air pipe, and introduce argon into the gas storage chamber 3. The argon enters the gas protection chamber 4 from the vent hole 2a on the orifice plate 2 to protect the bottom of the lobe groove 101;

[0040] S4. Welding the lobes on the lobe component 100.

[0041] In this embodiment, when the lobe component 100 is subjected to periodic welding operation, 1 to 12 sets of argon arc welding gas protection devices can be installed at one time.

[0042] In step S4, after welding is completed, only the gas pipe on the pipe joint 5 is unplugged and the argon supply is stopped. The argon arc welding gas protection device is retained in the lobe groove 101 of the lobe part 100. The residual inert gas inside the protective weld is cooled to a relatively low temperature without significant oxidation and other physical and chemical reactions. The argon arc welding gas protection device is removed after complete cooling.

[0043] In this embodiment, considering that argon is heavier than air, the pipe joint 5 is arranged on the lower plate 1d, and when argon is introduced for protection, the pipe joint 5 is always facing downward and the housing 1 is always facing upward. On the one hand, it helps to completely exhaust the air in the argon arc welding gas protection device before lobe welding to prevent air from contaminating the molten pool. On the other hand, it helps to ensure that the argon arc welding gas protection device is evenly filled with argon during the entire welding process, enhance the protection effect of the molten pool, and improve the back forming quality of the weld.

[0044] By adopting the argon arc welding gas protection device provided in this embodiment, the inert gas protection is stable and sufficient during the welding process, avoiding the problem of poor weld quality caused by leakage protection and unstable and insufficient protective gas flow when the welding assistant manually moves the protective gas device. The quick-disassembly all-inclusive gas protection device configuration can protect the weld for a long time after welding, thanks to the fact that the argon arc welding gas protection device is still retained on the lobe part 100 after welding, and the inert gas remaining inside it cools the protective weld to a lower temperature without significant oxidation and other physical and chemical reactions. This will further improve the quality of the weld and ensure the stable delivery of qualified products.

[0045] By adopting the argon arc welding gas protection device and method provided in this embodiment, welding assistants can be removed, which can more reasonably activate and utilize the on-site labor force on the one hand, and reduce the labor intensity of workers on the other hand. This will significantly improve the enthusiasm of workers for production and create a more relaxed and stable psychological state. This can also further promote the accelerated transformation from "maintaining production" to "high-quality production". It can strongly guarantee the stability of product production, the quality of delivery and enhance product competitiveness.

[0046] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A argon arc welding gas protection device for an aircraft engine mixer lobe, characterized in that: The invention comprises a shell (1) for being inserted into a lobe groove (101) of a lobe component (100); the shell (1) is a hollow shell formed by a bottom plate (1b), an upper plate (1c), a lower plate (1d) and two side panels (1a); a perforated plate (2) is arranged in the inner cavity of the shell (1), and a vent hole (2a) is arranged on the perforated plate (2); a gas storage chamber (3) is formed between the perforated plate (2) and the bottom plate (1b); the perforated plate (2) and the bottom plate (1b), the upper plate (1c) and the two side panels (1a) together form an open gas protection chamber (4); the two ends of the lower plate (1d) extend outwards and are vertically bent upwards to form a hook plate (1e); a pipe joint (5) is arranged on the lower plate (1d), and the pipe joint (5) is connected to the gas storage chamber (3).

2. A argon arc welding gas protection device for an aircraft engine mixer lobe as claimed in claim 1, characterized in that: The mouth contour of the gas protection chamber (4) fits the groove bottom of the lobe groove (101).

3. The argon arc welding gas protection device for aircraft engine mixer lobes according to claim 1, characterized in that: The lower part of the orifice plate (2) is arranged as a first through hole area (2b), and the middle and upper parts of the orifice plate (2) are arranged as a second through hole area (2c); the diameter of the ventilation holes (2a) in the first through hole area (2b) is smaller than the diameter of the ventilation holes (2a) in the second through hole area (2c).

4. A argon arc welding gas protection device for an aircraft engine mixer lobe as claimed in claim 3, characterized in that: In the second through hole region (2c), along a direction away from the pipe joint (5), the diameters of the vent holes (2a) in the second through hole region (2c) increase row by row.

5. The argon arc welding gas protection device for aircraft engine mixer lobes according to claim 3, characterized in that: The number of ventilation holes (2a) contained in each row in the first through hole area (2b) is n1; the number of ventilation holes (2a) contained in each row in the second through hole area (2c) is n2, wherein n1>n2.

6. A argon arc welding gas protection device for an aircraft engine mixer lobe as claimed in claim 1, characterized in that: The width of the housing (1) is T, which satisfies: t+0.5mm≤T≤t+2.0mm; Wherein, t is the width of the opening of the lobe groove (101) on the lobe part (100).

7. A argon arc welding gas protection device for an aircraft engine mixer lobe as claimed in claim 1, characterized in that: The shell (1) and the orifice plate (2) are made of high-temperature alloy GH3128.

8. A gas shielding method for argon arc welding of aeroengine mixer lobes, characterized in that: The argon arc welding gas protection device according to any one of claims 1 to 7 comprises the following steps: S1, installing the lobe component (100) on a welding tool; S2, inserting the housing (1) of the argon arc welding gas protection device into the lobe groove (101) of the lobe part (100), so that the mouth contour of the gas protection chamber (4) of the argon arc welding gas protection device fits with the groove bottom of the lobe groove (101) on the lobe part (100), and the hook plates (1e) on both sides of the lower plate body (1d) are respectively clamped on the lobe side walls (102) on both sides of the lobe groove (101); S3, connecting an argon tank to the pipe joint (5) through an air pipe, and introducing argon into the gas storage chamber (3); the argon enters the gas protection chamber (4) through the air vent (2a) on the orifice plate (2) to protect the bottom of the lobe groove (101); S4, welding the lobes on the lobe component (100).

9. A gas shielding method for argon arc welding of aero-engine mixer lobes as claimed in claim 8, characterized in that: In step S4, after welding is completed, only the gas pipe on the pipe joint (5) is unplugged and the supply of argon gas is stopped. The argon arc welding gas protection device is retained in the lobe groove (101) of the lobe part (100), and the argon arc welding gas protection device is removed after complete cooling.

10. A gas shielding method for argon arc welding of aero-engine mixer lobes as claimed in claim 8, characterized in that: When argon gas is introduced for protection, the pipe joint (5) is always facing downwards and the shell (1) is always facing upwards.

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