A welding positioning tool and method for an aircraft engine mounting seat

Abstract

The application discloses an aero-engine mounting seat welding positioning tool and method. The welding positioning tool comprises a guide rod, a first nut, a first bushing, a second bushing and a second nut which are sequentially connected on the guide rod, a gasket is further arranged between the first nut and the first bushing, and a spring is further arranged to pass through the second bushing and tightly press between the second nut and an outer wall of a casing. The positioning method and tool solve the shortcomings of poor adaptability and narrow use range of common positioning pins and stepped pins. By expanding the specifications and types of the first bushing, the second bushing and the guide rod, the stepped pins with the tight positioning can be formed in different specifications and types, and the use range of the positioning tool is further expanded.

Description

Technical Field

[0001] This invention belongs to the field of welding technology for aircraft engine component mounting bases, specifically relating to a welding positioning tool and method for aircraft engine mounting bases. Background Technology

[0002] The outer circumference of the casing and cylindrical components of aero-engines is generally covered with mounting seats of varying structures and numbers. These mounting seats are connected to the outer wall of the component through welding. The welding of the mounting seats typically uses specialized welding fixtures and locating pins to strictly control the welding position and angular orientation of the mounting seats, in order to meet the positional requirements of the mounting seats on the outer wall and ultimately meet the assembly requirements of other related components of the aero-engine.

[0003] When there is no bottom hole on the outer wall of the component but a bottom hole on the mounting base, a combination fixture or a special welding fixture and its locating pins can be used to position and weld the mounting base; when there is a bottom hole on the outer wall of the component and a bottom hole on the mounting base, and the diameters of the two bottom holes are the same, ordinary locating pins can be used to assist in positioning and welding; when there is a bottom hole on the outer wall of the component and a bottom hole on the mounting base, and the diameters of the two bottom holes are different, stepped pins can be used to assist in positioning and welding.

[0004] Figure 1 The diagram shows a typical aero-engine casing assembly. The casing has a cylindrical structure and is mainly composed of the outer wall A and mounting seats b, c, d, e, and f of different structures, sizes, and quantities distributed around its circumference, connected by welding. Both the outer wall and the mounting seats have bottom holes. The following problems arise during installation: 1. Before welding the outer wall and mounting seats, bottom holes are left on both. Because the outer wall is welded to different mounting seats, the diameter of these bottom holes varies. Furthermore, the diameters of the bottom holes differ between the various types of mounting seats due to their different structures and uses. 2. A large number and variety of mounting seats are distributed around the circumference of the outer wall, and the welding positions of these seats have clear and strict requirements for angular and spatial positioning. Without dedicated welding fixtures, positioning and welding the mounting seats is quite difficult.

[0005] To meet production schedule and cost requirements, locating pins and step pins are typically used for welding to assist in positioning. However, due to issues such as inconsistent diameters of the bottom holes on the outer wall, the mounting base, and mismatches between the outer wall and mounting base bottom hole diameters, there is a significant demand for different diameter specifications of locating pins and step pins. When the required diameter locating pins or step pins are unavailable on the production site, it is necessary to immediately arrange for specialized personnel and equipment to process them for positioning welding, resulting in a waste of human resources, occupation of processing equipment, and an extension of the production cycle.

[0006] Chinese invention patent CN109382624B discloses a welding fixture and method for an aero-engine mounting base. The fixture includes a male mold and a female mold, the mating surfaces of which have the same shape as the outer contour of the part to be welded. A welding window is opened in the center of the female mold, and a hole is opened in the center of the male mold, with a spring-loaded clamping boss located below the welding window. This invention solves the problems of previous methods for welding large, thin-walled aero-engine component mounting bases under limited positioning and severe deformation of the mounting base after welding. It uses a small, simple welding fixture in conjunction with a common hydraulic press, offering simple operation, wide applicability, high welding efficiency, and good deformation control. However, this device does not effectively solve the problems raised in this technical solution. Therefore, a set of mounting fixtures and methods specifically designed for mounting bases on the outer circumference of engine casings and cylindrical components are needed. Summary of the Invention

[0007] To address the aforementioned problems, this invention aims to provide a welding positioning tool and method for aircraft engine mounting brackets.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a welding and positioning tool for an aircraft engine mounting base, comprising a guide rod, a first nut, a first bushing, a second bushing, and a second nut sequentially connected on the guide rod, a washer between the first nut and the first bushing, and a spring passing through the second bushing and pressing its two ends between the second nut and the outer wall of the casing.

[0009] Preferably, the first bushing and the second bushing are cylindrical structures made of metal material, with smooth inner and outer walls.

[0010] Preferably, the guide rod is a round rod made of metal material, with external threads machined at both ends. The major diameter of the external threads is less than or equal to the diameter of the guide rod. The first bushing and the second bushing pass through the guide rod and form a tight fit with the guide rod.

[0011] Preferably, the first nut, the second nut, the washer, and the spring are all made of metal.

[0012] Preferably, the internal threads of the first nut and the second nut are engaged with the external threads at both ends of the guide rod.

[0013] Preferably, the positioning tool includes various parts with different specifications, which can be used to form step pins with clamping positioning for different usage scenarios.

[0014] A positioning method using an aircraft engine mounting bracket welding positioning tool includes the following steps:

[0015] Step 1: Assemble the welding positioning tool, measure the diameter of the outer wall of the casing and the bottom hole of the mounting base, select the first bushing and the second bushing of the corresponding specifications, and then select other accessories according to the first bushing and the second bushing to form a set of stepped pins with clamping positioning.

[0016] Step 2: Position the outer wall of the casing, pass the guide rod through the bottom hole on the outer wall of the casing, and then pass the first bushing and the second bushing through the guide rod from both ends to form a sliding stepped pin;

[0017] Step 3: Position the mounting base, pass the mounting base through the first bushing and fit it against the outer wall of the casing, then pass the gasket through the guide rod and fit it against the side end of the mounting base, and screw the first nut into the guide rod to the appropriate position;

[0018] Step 4: Install the spring for positioning. Pass the spring through the second bushing, and then screw the second nut into the guide rod until it is difficult to screw in further. At this point, the spring force is transmitted to the washer through the guide rod, and the washer presses the mounting base tightly against the outer wall of the casing, thus completing the positioning and clamping of the mounting base.

[0019] Step 5: Perform positioning welding on the mounting base.

[0020] Preferably, the outer diameter of the first bushing selected in step 1 is adapted to the inner diameter of the bottom hole of the mounting base, and the outer diameter of the second bushing is adapted to the inner diameter of the bottom hole of the outer wall of the casing.

[0021] Preferably, the gasket in step 3 passes through the guide rod and is positioned at the outer end of the first bushing, between the mounting base and the first nut.

[0022] Compared with existing technologies, the present invention has the following advantages: By expanding the specifications and types of parts such as the first bushing, the second bushing, and the guide rod, the present invention can assemble stepped pins with clamping positioning of different specifications and types, thereby further expanding the application range of positioning tools. It has the advantages of wide adaptability and wide application range. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a typical casing assembly;

[0025] Figure 2 This is a schematic diagram of the working state of the welding positioning tool for the mounting base of the present invention (the spring is not shown);

[0026] Figure 3This is a schematic diagram of the working state of the welding positioning tool for the mounting base of the present invention (the spring is visible);

[0027] In the diagram, 1-first nut; 2-first bushing; 3-second bushing; 4-second nut; 5-washer; 6-spring; 7-guide rod; A-outer wall of the casing; B-mounting base. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0029] Figure 1 The image shows a typical aircraft engine casing assembly. The casing has a cylindrical structure and is mainly composed of the outer wall A of the casing and mounting seats b, c, d, e, and f of different structures, sizes, and quantities distributed around the circumference of the outer wall, which are connected by welding. Both the outer wall A of the casing and mounting seat B have bottom holes.

[0030] 1. Reference Figure 2 and Figure 3 This document describes the design and manufacture of a positioning welding tool. The tool consists of a first bushing 2, a second bushing 3, a guide rod 7, a first nut 1, a second nut 4, a spring 6, and a washer 5, all connected together via the guide rod 7. The first bushing 2 and second bushing 3 are machined from metal, forming a cylindrical structure with smooth inner and outer walls. The guide rod 7 is a round rod machined from metal, with a smooth outer wall and external threads at both ends. The major diameter of the external threads is less than or equal to the diameter of the guide rod 7, facilitating the passage of the first bushing 2 and second bushing 3. The first bushing 2 and second bushing 3 form a tight fit with the guide rod 7. The washer 5 is machined from metal. The first nut 1 and second nut 4 are machined from metal, with their internal threads engaging with the external threads of the guide rod 7. The spring 6 is machined from metal, possessing strong elasticity, allowing it to pass smoothly through the second bushing 3 while its two ends are pressed between the second nut 4 and the outer wall A of the casing. Each part comes in various specifications to form a stepped pin with clamping and positioning for different application scenarios.

[0031] 2. Assemble the positioning welding tools. Measure the diameter of the bottom hole A on the outer wall of the casing and the bottom hole B on the mounting base, select the corresponding first bushing 2 and second bushing 3, and then select other accessories through the first bushing 2 and second bushing 3 to assemble a set of stepped pins with clamping positioning.

[0032] 3. Positioning and welding mounting base B. First, pass the guide rod 7 through the bottom hole on the outer wall A of the casing. Then, pass the first bushing 2 and the second bushing 3 through the guide rod 7 from both ends to form a sliding stepped pin. The mounting base B passes through the second bushing 3. Then, pass the washer 5 through the guide rod 7 on the side of the mounting base B and screw the first nut 1 into the guide rod 7 to the appropriate position. Pass the spring 6 through the second bushing 3. Finally, screw the second nut 4 into the guide rod 7 until it is difficult to screw it in. At this time, the elastic force of the spring 6 is transmitted to the washer 5 through the guide rod 7. The washer 5 presses the mounting base B tightly against the outer wall A of the casing, thus completing the positioning and pressing of the mounting base B. Then, the mounting base B can be position welded.

[0033] This invention expands the scope of application of positioning tools by broadening the specifications and types of parts such as the first bushing 2, the second bushing 3, and the guide rod 7. Different specifications and types of stepped pins with clamping positioning can be assembled.

[0034] The above provides a detailed description of the welding positioning tool and method for an aircraft engine mounting base provided by this invention. Specific examples have been used to illustrate the structure and working principle of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

Claims

1. A positioning method using an aircraft engine mounting bracket welding positioning tool, characterized in that: The welding positioning tool includes a guide rod (7), a first nut (1), a first bushing (2), a second bushing (3), and a second nut (4) connected in sequence on the guide rod (7). A washer (5) is also placed between the first nut (1) and the first bushing (2). A spring (6) is also provided, passing through the second bushing (3) and pressing its two ends between the second nut (4) and the outer wall (A) of the casing. The welding positioning tool includes various parts with different specifications, which can be used to form stepped pins with clamping positioning in different usage scenarios. The method includes the following steps. Step 1: Assemble the welding positioning tool, measure the diameter of the bottom hole of the outer wall of the casing (A) and the mounting base (B), select the first bushing (2) and the second bushing (3) of the corresponding specifications, and then select other accessories according to the first bushing (2) and the second bushing (3) to form a set of stepped pins with clamping positioning. The outer diameter of the first bushing (2) is matched with the inner diameter of the bottom hole of the mounting base (B), and the outer diameter of the second bushing (3) is matched with the inner diameter of the bottom hole of the outer wall of the casing (A). Step 2: Position the outer wall of the casing (A), pass the guide rod (7) through the bottom hole on the outer wall of the casing (A), and then pass the first bushing (2) and the second bushing (3) through the guide rod (7) from both ends to form a sliding stepped pin; Step 3: Position the mounting base (B), pass the mounting base (B) through the first bushing (2) and fit it against the outer wall of the casing, then pass the gasket (5) through the guide rod (7) and fit it against the side end of the mounting base, and screw the first nut (1) into the guide rod (7) to the appropriate position; Step 4: Install the spring (6) for positioning. Pass the spring (6) through the second bushing (3), and then screw the second nut (4) into the guide rod (7) until it is difficult to screw in. At this time, the elastic force of the spring (6) is transmitted to the washer (5) through the guide rod (7). The washer (5) presses the mounting base (B) against the outer wall (A) of the casing, thus completing the positioning and pressing of the mounting base (B). Step 5: Perform positioning welding on the mounting base (B).

2. The positioning method using an aircraft engine mounting bracket welding positioning tool according to claim 1, characterized in that: The gasket (5) of step 3 passes through the guide rod (7) and is placed at the outer end of the first bushing (2), located between the mounting base (B) and the first nut (1).

3. The positioning method using an aircraft engine mounting bracket welding positioning tool according to claim 1, characterized in that: The first bushing (2) and the second bushing (3) are cylindrical structures made of metal materials, with smooth inner and outer walls.

4. The positioning method using an aircraft engine mounting bracket welding positioning tool according to claim 1, characterized in that: The guide rod (7) is a round rod made of metal material. Both ends of the guide rod (7) are machined with external threads. The major diameter of the external threads is less than or equal to the diameter of the guide rod (7). The first bushing (2) and the second bushing (3) pass through the guide rod (7) and form a tight fit with the guide rod.

5. The positioning method using an aircraft engine mounting bracket welding positioning tool according to claim 1, characterized in that: The first nut (1), the second nut (4), the washer (5) and the spring (6) are all made of metal.

6. The positioning method using an aircraft engine mounting bracket welding positioning tool according to claim 1, characterized in that: The internal threads of the first nut (1) and the second nut (4) are engaged with the external threads at both ends of the guide rod (7).

Images