Machining method for achieving local self-locking of high-temperature alloy thin-wall lining

Abstract

The invention belongs to the field of structural design of aero-engine gear pump shell thin-wall threaded bushing tools. The local self-locking function is achieved, and the method comprises the steps that a threaded bushing and a hexagonal inner supporting rod are placed in an extrusion device, a supporting adjusting base is rotationally adjusted to the position, needing to be self-locked, of the threaded bushing, a self-locking three-jaw chuck is used for extruding three extrusion rods in the extrusion device, and the threaded bushing and the hexagonal inner supporting rod are clamped in the extrusion device; and then the thread form is extruded, so that the thread form is deformed. The method is suitable for local self-locking of the high-temperature alloy thin-wall lining.

Description

Technical Field

[0001] The invention belongs to the field of tooling structure design of thin-walled threaded bushings of aircraft engine gear pump housings and relates to a processing method for realizing partial self-locking of a high-temperature alloy thin-walled bushing. Background Art

[0002] When the main casing of an aircraft engine is connected to an external machine, a threaded sleeve or threaded bushing is generally used to achieve connection strength. In order to ensure that the screw does not fall off when resonance occurs, a self-locking bushing is required. At present, self-locking bushings are a blank field in China, with no standards or manufacturers. The main source is based on European standards, and there is no design standard for the self-locking part, only a usage standard, and no processing methods, tools, or technologies to rely on. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a processing method for realizing partial self-locking of a high-temperature alloy thin-wall bushing, so as to realize the partial self-locking function.

[0004] The technical solution of the present invention is:

[0005] A processing method for realizing partial self-locking of a high-temperature alloy thin-walled bushing, comprising:

[0006] Place the threaded bushing and the hexagonal inner support rod into the extrusion device, rotate and adjust the support adjustment base to the required self-locking position of the threaded bushing, use the self-locking three-jaw chuck to extrude the three extrusion rods in the extrusion device, and then extrude the thread profile to deform the thread profile.

[0007] Specifically include:

[0008] Step 1: Place the extrusion rod 5 into the position holding device 6, screw in the pressure rod directional screw 7, and after assembly, screw in the support adjustment base 2 to complete the assembly of the extrusion device.

[0009] Step 2: Place the high-temperature alloy thin-wall bushing 1 into the support adjustment base 2, and place the hexagonal inner support rod 3 into the bushing to complete the assembly of the bushing and the extrusion device.

[0010] Step 3: Adjust the support adjustment base 2 to the extrusion position, insert the three-jaw chuck 4, extrude the extrusion rod of the extrusion mechanism, and complete the bushing processing.

[0011] Before use, a tensile test is performed on the high-temperature alloy material to obtain the material strength and plasticity technical parameters; based on the local self-locking force design requirements and self-locking position of the high-temperature alloy thin-walled bushing, the deformation and deformation area required for the bushing to achieve the self-locking force are calculated.

[0012] According to the deformation amount and deformation area, the force bearing area of ​​the head of the extrusion rod 5 is calculated; according to the deformation amount of the bushing, the clearance fit size between the hexagonal inner support rod 3 and the bushing 1 is calculated.

[0013] When the force bearing area of ​​the head of the extrusion rod 5 is 3mm 2 When the clearance between the hexagonal inner support rod 3 and the bushing 1 is 0.1-0.15mm, applying a pressure of 4.5-8N / m with a torque wrench can enable the bushing to obtain a local self-locking force of 1.5N-3.5N.

[0014] The beneficial effect of the present application is that the present invention designs a thin-walled threaded bushing for the gear pump housing of an aircraft engine, and when in use, the screw has a self-locking force after being screwed into the bushing to the assembly depth, and the design requirement of the local self-locking force of the bushing can be achieved within a range of 1.5N / m to 3.5N / m. Moreover, the screw can be freely disassembled, and the entire structure can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure and dimensions of a high-temperature alloy thin-wall threaded bushing;

[0016] Figure 2 Schematic diagram of assembly of high temperature alloy thin wall bushing extrusion device;

[0017] Figure 3 Schematic diagram of the assembly process of high-temperature alloy thin-walled bushings. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings of the embodiments.

[0019] The principle of a processing method for realizing partial self-locking of a high-temperature alloy thin-walled bushing is:

[0020] Place the threaded bushing and the internal support rod into the extrusion device, rotate and adjust the support adjustment base to the required self-locking position of the bushing, use the self-locking three-jaw chuck to extrude the three extrusion rods in the extrusion device, and then extrude the thread profile to deform the thread profile.

[0021] By controlling the contact area size of the extrusion rod head and the size of the hexagonal inner support rod, the tooth deformation area can be adjusted. By adjusting the extrusion force applied by the torque wrench to the three-jaw chuck, the bushing can obtain different deformation amounts, thereby realizing the self-locking function of the bushing in different ranges. That is, by increasing the extrusion force and extrusion area, the local friction between the bushing and the assembly screw can be increased to realize the local self-locking and anti-loosening function.

[0022] Figure 2 The figure shows the assembly diagram of the high temperature alloy thin-wall bushing extrusion device of the present invention, which is composed of a support and adjustment base 2, an extrusion rod 5, a position holding device 6, a pressure rod directional screw 7, and a hexagonal inner support rod 3.

[0023] Figure 3 FIG. 1 is a schematic diagram of the processing and assembly of a high-temperature alloy thin-walled bushing according to the present invention, which is composed of a high-temperature alloy thin-walled bushing 1 and a three-jaw chuck 4.

[0024] Step 1: Place the extrusion rod 5 into the position holding device 6, screw in the pressure rod directional screw 7, and after assembly, screw in the support adjustment base 2 to complete the assembly of the extrusion device.

[0025] Step 2: Place the high-temperature alloy thin-wall bushing 1 into the support adjustment base 2, and place the hexagonal inner support rod 3 into the bushing to complete the assembly of the bushing and the extrusion device.

[0026] Step 3: Adjust the support adjustment base 2 to the extrusion position, insert the three-jaw chuck 4, extrude the extrusion rod of the extrusion mechanism, and complete the bushing processing.

[0027] Example

[0028] A processing method for realizing partial self-locking of a high-temperature alloy thin-walled bushing:

[0029] The extrusion device is composed of a supporting and adjusting base 2, a hexagonal inner supporting rod 3, an extrusion rod 5, a position holding device 6, and a pressure rod directional screw 7.

[0030] Assemble the extrusion device:

[0031] The first step: put the extrusion rod 5 into the 3 holes evenly distributed on the circumference of the position holding device 6 (the extrusion rod and the positioning hole adopt a clearance fit with a clearance of 0.01-0.03mm), and at the same time screw in the pressure rod directional screw 7 to orient the extrusion rod.

[0032] Step 2: After the extrusion rod 5, the position holding device 6 and the pressure rod directional screw 7 are installed in coordination, they are screwed into the support adjustment base 2 to complete the assembly of the extrusion device.

[0033] Workpiece installation during extrusion process:

[0034] The first step: Place the high-temperature alloy thin-wall bushing 1 into the support adjustment base 2, and place the hexagonal inner support rod 3 into the bushing to complete the installation of the workpiece in the extrusion processing device.

[0035] Step 2: Adjust the support adjustment base 2 to the extrusion position, insert the three-jaw chuck 4, use a 10N / m torque wrench to extrude the extrusion rod 5 of the extrusion device, and complete the bushing processing.

[0036] Before use, the high-temperature alloy material must be subjected to a tensile test to obtain technical parameters such as material strength and plasticity. According to the local self-locking force design requirements and self-locking position parameters of the high-temperature alloy thin-walled bushing, the deformation amount and deformation area required for the bushing to achieve the self-locking force are calculated.

[0037] According to the deformation amount and deformation area, calculate the force bearing area of ​​the head of the extrusion rod 5. According to the deformation amount of the bushing, calculate the clearance fit size between the hexagonal inner support rod 3 and the bushing 1. The test shows that when the force bearing area of ​​the head of the extrusion rod 5 is 3mm 2When the clearance between the hexagonal inner support rod 3 and the bushing 1 is 0.1-0.15mm, applying a pressure of 4.5-8N / m with a torque wrench can make the bushing obtain a local self-locking force of 1.5N-3.5N.

[0038] The present invention is an extrusion device designed according to the characteristics of high-temperature alloy materials and material deformation characteristics and in accordance with mechanical principles. The device has the characteristics of versatility, convenience, adjustable extrusion diameter range, adjustable extrusion depth, and adjustable extrusion force area.

[0039] The device is used to perform top extrusion on a high-temperature alloy thin-walled bushing. By changing the head area of ​​the extrusion rod and the size of the hexagonal inner support rod, the local deformation area of ​​the bushing can be controlled, so that the bushing can be deformed locally to increase friction and achieve the function of local self-locking force. The size of the local deformation area also affects the final friction of the bushing.

[0040] Use a 10N / m torque wrench and a self-centering chuck to squeeze the extrusion device after the workpiece is installed. The torque wrench applies pressure to the three-jaw chuck, and the three-jaw chuck locks and squeezes the three extrusion rods of the extrusion device, and the pressure is transmitted to the high-temperature alloy thin-wall bushing. After the bushing tooth profile is squeezed, permanent plastic deformation is generated to achieve the self-locking function.

[0041] By conducting a tensile test on the high-temperature alloy material, the material strength and plasticity can be obtained, and the pressure and force area required for the bushing deformation can be calculated. According to the test after calculation, adjusting the torque wrench torque change 4.5-8N / M can make the bushing obtain a local self-locking force of 1.5N-3.5N, and the bushing extrusion process is completed.

[0042] The device can adjust the local self-locking position of the bushing by adjusting the height of the support adjustment base to meet the different self-locking position adjustment requirements of the bushing. Batch processing can be carried out after one adjustment.

[0043] The core components of this device are: extrusion rod 5, position holding device 6, hexagonal inner support rod 3. In order to ensure effective transmission of force, the working hardness of the extrusion rod and the hexagonal inner support rod needs to reach HRC42-46. In order to ensure that the three extrusion rods work synchronously and centripetally during the pressurization process, the three pressure rod positioning holes of the position holding device 6 need to be designed to be evenly distributed around the circumference.

Claims

1. A processing method for realizing partial self-locking of a high-temperature alloy thin-walled bushing, characterized in that: include: Place the threaded bushing and the hexagonal inner support rod into the extrusion device, rotate and adjust the support adjustment base to the required self-locking position of the threaded bushing, use the self-locking three-jaw chuck to extrude the three extrusion rods in the extrusion device, and then extrude the thread profile to deform the thread profile.

2. A method for processing a high-temperature alloy thin-walled bushing to achieve partial self-locking as claimed in claim 1, characterized in that: Specifically include: The first step is to place the extrusion rod (5) into the position holding device (6), screw in the extrusion rod directional screw (7), and after assembly, screw in the support adjustment base (2) to complete the assembly of the extrusion device. Step 2: Place the high temperature alloy thin-wall bushing (1) into the support adjustment base (2), and place the hexagonal inner support rod (3) into the bushing to complete the assembly of the bushing and the extrusion device. Step 3: Adjust the support adjustment base (2) to the extrusion position, insert the three-jaw chuck (4), and extrude the extrusion rod of the extrusion mechanism to complete the bushing processing.

3. A method for processing a high-temperature alloy thin-walled bushing to achieve partial self-locking as claimed in claim 2, characterized in that: Before use, a tensile test is performed on the high-temperature alloy material to obtain the material strength and plasticity technical parameters; based on the local self-locking force design requirements and self-locking position of the high-temperature alloy thin-walled bushing, the deformation and deformation area required for the bushing to achieve the self-locking force are calculated.

4. A method for processing a high-temperature alloy thin-walled bushing to achieve partial self-locking as claimed in claim 3, characterized in that: The force bearing area of ​​the head of the extrusion rod (5) is calculated according to the deformation amount and the deformation area; and the clearance fit size between the hexagonal inner support rod (3) and the bushing (1) is calculated according to the deformation amount of the bushing.

5. A method for processing a high-temperature alloy thin-walled bushing to achieve partial self-locking as claimed in claim 4, characterized in that: When the force bearing area of ​​the head of the extrusion rod (5) is 3mm 2 When the clearance between the hexagonal inner support rod (3) and the bushing (1) is 0.1-0.15 mm, applying a pressure of 4.5-8 N / m with a torque wrench can enable the bushing to obtain a local self-locking force of 1.5 N-3.5 N.

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