Secondary correction welding process for titanium membrane disc coupling for aviation

Abstract

The invention relates to a secondary correction welding process for a titanium membrane disc coupling for aviation, which comprises the following steps: step 1, measuring end face run-out of a membrane, step 2, judging and marking a run-out value, and if the run-out value is within an allowable range, judging that the welding is qualified; if yes, the position of the maximum jumping value is marked on the surface of the assembly through a laser indicator or a mechanical marking pen. According to the method, the defects that a membrane disc coupler is extremely prone to deformation and narrow in space structure are overcome, centering adjustment is conducted on the membrane disc coupler exceeding the tolerance range through an electron beam welding method, the situation that the membrane disc coupler is not centered in the machining process is reduced, and the product percent of pass is effectively increased.

Description

Technical Field

[0001] This invention belongs to the field of aircraft manufacturing technology and relates to a secondary correction welding process for titanium diaphragm couplings for aircraft. Background Technology

[0002] Diaphragm couplings are precision components with special functions in aero-engine accessories, typically composed of two or more metal parts joined by welding or other connection methods. Their core function is to provide structural elasticity or degrees of freedom of movement under high temperature, high pressure, and high vibration environments to compensate for dynamic deformations caused by thermal expansion, mechanical stress, or assembly errors during engine operation.

[0003] During the welding process of diaphragm couplings, factors such as thermal stress, the properties of welding materials, and the control of welding parameters may cause misalignment or parallelism between the two diaphragms after welding, resulting in excessive end face runout of the diaphragm coupling. Summary of the Invention

[0004] The purpose of this invention is to provide a secondary correction welding process for titanium diaphragm couplings used in aviation, which can solve the problem of excessive end face runout in diaphragm couplings.

[0005] According to the technical solution provided by this invention: a secondary repair welding process for a titanium diaphragm coupling for aerospace applications includes the following steps: Step 1: Measurement of diaphragm end face runout Step 2: Determining and Marking the Jump Value If the runout value is within the allowable range, the welding is deemed qualified; if it exceeds the allowable range, the position of the maximum runout value is marked on the component surface using a laser indicator or a mechanical marking pen. Step 3: Secondary Welding Correction 1. Place the diaphragm coupling into the electron beam welding machine and clamp it. Clamp the first flange or the second flange and adjust the position of the first diaphragm and the second diaphragm to the bottom with the maximum runout value. 2. Spot weld the first diaphragm and the second diaphragm to check the accuracy of the clamping and to perform rough positioning; the spot welds are evenly distributed between the outer peripheries of the first diaphragm and the second diaphragm. 3. Secondary finishing welding of the first and second diaphragms: The welding torch is positioned above the first and second diaphragms, and the laser beam is emitted vertically from top to bottom. Simultaneously, the diaphragm coupling rotates under the drive of the machine tool. Compared with the initial welding parameters, the secondary finishing welding parameters are as follows: positioning voltage, positioning speed, welding voltage, and welding speed remain unchanged; the positioning focusing current and positioning beam current of the secondary finishing welding are 40%-60% of the initial welding parameters; and the welding focusing current and welding beam current of the secondary finishing welding are 60%-80% of the initial welding parameters.

[0006] As a further improvement of the present invention, in step one, the electron beam welded diaphragm coupling is placed on the positioning platform. First, the runout value of the end face of the first diaphragm and the second diaphragm of the assembly (end face a or end face b) is measured by a dial indicator. After the measurement is completed, it is compared with the preset allowable value, the end face runout ≤ 0.05mm.

[0007] As a further improvement of the present invention, the number of spot welds is between 3 and 12.

[0008] As a further improvement of the present invention, the parameters for secondary finishing welding are as follows: positioning voltage is 30kV, positioning focusing current is 400mA, positioning beam current is 3.2mA, positioning speed is 2000mm / min, welding voltage is 20kV, welding focusing current is 900mA, welding beam current is 12mA, and welding speed is 1200mm / min.

[0009] As a further improvement of the present invention, the parameters for secondary finishing welding are as follows: positioning voltage is 30kV, positioning focusing current is 600mA, positioning beam current is 4.8mA, positioning speed is 2000mm / min, welding voltage is 20kV, welding focusing current is 1200mA, welding beam current is 16mA, and welding speed is 1200mm / min.

[0010] As a further improvement of the present invention, the initial welding parameters for the first diaphragm and the second diaphragm are as follows: positioning voltage of 70kV, positioning focusing current of 1200mA, positioning beam current of 5mA, positioning speed of 1500mm / min, welding voltage of 30kV, welding focusing current of 1300mA, welding beam current of 30mA, and welding speed of 1600mm / min.

[0011] The positive and progressive effects of this invention are as follows: This invention overcomes the characteristics of diaphragm disc couplings being easily deformed and having a small spatial structure. By using electron beam welding, diaphragm disc couplings that are out of tolerance can be aligned and adjusted, reducing misalignment during the processing of diaphragm disc couplings and effectively improving the product qualification rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0016] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.

[0017] like Figure 1 As shown, the diaphragm coupling includes a first diaphragm 2 and a second diaphragm 3 made of titanium, connected by welding. A diaphragm weld 5 is welded between the first diaphragm 2 and the second diaphragm 3. The outer side of the first diaphragm 2 is connected to a first flange 1, and the second diaphragm 3 is connected to a second flange 4. The diaphragm weld 5 is a circumferential weld. The diameters of the first diaphragm 2 and the second diaphragm 3 are 100-150 mm.

[0018] Ideally, the axes of the first diaphragm 2 and the second diaphragm 3 should be on the same horizontal line, meaning they should be perfectly aligned. However, due to factors such as thermal stress during welding, the properties of the welding materials, and the control of welding parameters, misalignment of the first diaphragm 2 and the second diaphragm 3 in the diaphragm coupling may occur, including angular misalignment, parallel misalignment, or both. Considering the extreme peculiarities of angular and parallel misalignment occurring individually, it is generally more common for both to occur simultaneously. In this case, the transmission capacity of the diaphragm coupling will be significantly affected, leading to a decrease in its overall ability to adjust misalignment.

[0019] High-speed rotating diaphragm couplings require very precise alignment to avoid overloading the drive shaft and driven bearing. To determine the misalignment of the diaphragm coupling, the end face runout of the first diaphragm 2 or the second diaphragm 3 needs to be measured. When misalignment occurs between the first diaphragm 2 and the second diaphragm 3, the end face runout may exceed the allowable value.

[0020] A secondary repair welding process for a titanium diaphragm coupling for aerospace applications includes the following steps: Step 1: Measurement of diaphragm end face runout After electron beam welding, the diaphragm coupling is placed on the positioning platform. First, the end face runout value (end face a or end face b) of the first diaphragm 2 and the second diaphragm 3 of the component is measured by dial indicator. After the measurement is completed, it is compared with the preset allowable value, end face runout ≤0.05mm.

[0021] Step 2: Determining and Marking the Jump Value If the runout value is within the allowable range, the welding is deemed qualified; if it exceeds the allowable range, the position of the maximum runout value is marked on the component surface using a laser indicator or a mechanical marker.

[0022] Step 3: Secondary Welding Correction 1. Place the diaphragm coupling into the electron beam welding machine and clamp it. Clamp the first flange 1 or the second flange 4, and adjust the position of the maximum runout value of the first diaphragm 2 and the second diaphragm 3 to the bottom.

[0023] 2. Spot weld the first diaphragm 2 and the second diaphragm 3 to check the accuracy of the clamping and the rough positioning.

[0024] The spot welds are evenly distributed between the outer periphery of the first diaphragm 2 and the second diaphragm 3, and the number of spot welds is between 3 and 12.

[0025] 3. Secondary finishing welding is performed on the first diaphragm 2 and the second diaphragm 3. The welding torch is positioned above the first diaphragm 2 and the second diaphragm 3, and the laser beam is emitted vertically from top to bottom. Simultaneously, the diaphragm coupling rotates under the drive of the machine tool. In this embodiment, the parameters for secondary finishing welding are as follows: positioning voltage 30kV, positioning focusing current 400mA, positioning beam current 3.2mA, positioning speed 2000mm / min, welding voltage 20kV, welding focusing current 900mA, welding beam current 12mA, and welding speed 1200mm / min. In the second embodiment, the parameters for secondary finishing welding are as follows: positioning voltage 30kV, positioning focusing current 600mA, positioning beam current 4.8mA, positioning speed 2000mm / min, welding voltage 20kV, welding focusing current 1200mA, welding beam current 16mA, and welding speed 1200mm / min.

[0026] The initial welding parameters for the first diaphragm 2 and the second diaphragm 3 are as follows: positioning voltage 70kV, positioning focusing current 1200mA, positioning beam current 5mA, positioning speed 1500mm / min, welding voltage 30kV, welding focusing current 1300mA, welding beam current 30mA, and welding speed 1600mm / min.

[0027] Compared to the initial welding parameters, the secondary finishing welding parameters remain unchanged: positioning voltage, positioning speed, welding voltage, and welding speed; the welding time remains unchanged at 30 seconds. The positioning focusing current and positioning beam current for the secondary finishing welding are 40%-60% of the initial welding parameters. The welding focusing current and welding beam current for the secondary finishing welding are 60%-80% of the initial welding parameters.

[0028] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A secondary repair welding process for a titanium diaphragm coupling for aerospace applications, characterized in that, Includes the following steps: Step 1: Measurement of diaphragm end face runout Step 2: Determining and Marking the Jump Value If the runout value is within the allowable range, the welding is deemed qualified; if it exceeds the allowable range, the position of the maximum runout value is marked on the component surface using a laser indicator or a mechanical marking pen. Step 3: Secondary Welding Correction 1. Place the diaphragm coupling into the electron beam welding machine and clamp it, clamp the first flange (1) or the second flange (4), and adjust the position of the maximum runout value of the first diaphragm (2) and the second diaphragm (3) to the bottom.

2. Spot weld the first diaphragm (2) and the second diaphragm (3) to check the accuracy of the clamping and the rough positioning; the spot welds are evenly distributed between the outer peripheries of the first diaphragm (2) and the second diaphragm (3); 3. Secondary trimming and welding of the first diaphragm (2) and the second diaphragm (3). The welding torch is positioned above the first diaphragm (2) and the second diaphragm (3). The laser beam is emitted vertically from top to bottom. At the same time as the laser beam is emitted, the diaphragm coupling rotates under the drive of the machine tool. Compared with the initial welding parameters, the secondary trimming welding parameters are: the positioning voltage, positioning speed, welding voltage, and welding speed remain unchanged. The positioning focusing current and positioning beam current of the secondary trimming welding are 40%-60% of the initial welding parameters. The welding focusing current and welding beam current of the secondary trimming welding are 60%-80% of the initial welding parameters.

2. The secondary correction welding process for the titanium diaphragm coupling for aerospace applications as described in claim 1, characterized in that, Step 1: Place the electron beam welded diaphragm coupling on the positioning platform. First, measure the end face runout (a end face or b end face) of the first diaphragm (2) and the second diaphragm (3) of the assembly using a dial indicator. After the measurement is completed, compare it with the preset allowable value, end face runout ≤ 0.05mm.

3. The secondary correction welding process for the titanium diaphragm coupling for aerospace applications as described in claim 1, characterized in that, The number of spot welds is between 3 and 12.

4. The secondary correction welding process for the titanium diaphragm coupling for aerospace applications as described in claim 1, characterized in that, The parameters for the secondary finishing welding are as follows: positioning voltage is 30kV, positioning focusing current is 400mA, positioning beam current is 3.2mA, positioning speed is 2000mm / min, welding voltage is 20kV, welding focusing current is 900mA, welding beam current is 12mA, and welding speed is 1200mm / min.

5. The secondary correction welding process for the titanium diaphragm coupling for aerospace applications as described in claim 1, characterized in that, The parameters for the secondary finishing welding are as follows: positioning voltage is 30kV, positioning focusing current is 600mA, positioning beam current is 4.8mA, positioning speed is 2000mm / min, welding voltage is 20kV, welding focusing current is 1200mA, welding beam current is 16mA, and welding speed is 1200mm / min.

6. The secondary correction welding process for the titanium diaphragm coupling for aerospace applications as described in claim 1, characterized in that, The initial welding parameters for the first diaphragm (2) and the second diaphragm (3) are as follows: positioning voltage 70kV, positioning focusing current 1200mA, positioning beam current 5mA, positioning speed 1500mm / min, welding voltage 30kV, welding focusing current 1300mA, welding beam current 30mA, and welding speed 1600mm / min.

Images