Simple welding fixture and welding method for machine case mounting seat

Abstract

The application discloses a simple welding clamp and welding method for a machine case mounting seat, and the clamp comprises a main body, a positioning block, a supporting plate, a bolt, a pressing block, a rectangular head screw and a pressing screw. The positioning block and the pressing block are respectively connected to two ends of the length direction of the main body, and the pressing block can be turned around the main body; the positioning block is provided with a first circular arc surface, and the pressing block is provided with a second circular arc surface; the bolt is slidingly connected to the main body, and the end of the bolt is provided with a third circular arc surface; the bolt is driven by the pressing screw, and the pressing block is fixed by the rectangular head screw. When the mounting seat is welded, the machine case is fixed with the clamp through the positioning block and the pressing block, the mounting seat is then tightly pressed by the bolt, and then positioning welding and final welding are carried out. The application is convenient to operate, low in cost and simple in structure, and is higher in welding efficiency for a small amount of mounting seats.

Description

Technical Field

[0001] This invention belongs to the field of aircraft engine casing welding technology, specifically relating to a simple welding fixture and welding method for a casing mounting base. Background Technology

[0002] In the production process of aero-engine casing, a certain number of mounting seats need to be welded to the outer wall of the casing. In order to reduce the deformation of parts near the weld during welding, the inner wall of the mounting seat needs to be supported during welding. In the traditional welding process, large expansion welding fixtures (such as CN119159287A, a fixture and method for welding mounting seats of combustion chamber casing) are used to assemble and position the mounting seats. Such fixtures are more suitable when there are a large number of mounting seats, but when the number of mounting seats to be welded is small, such fixtures are too bulky and costly. Summary of the Invention

[0003] The present invention aims to provide a simple welding fixture and welding method for a casing mounting base, which is easy to operate, low in cost, and simple in structure, and can realize the assembly positioning welding and subsequent welding of the casing mounting base.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A simple welding fixture for a casing mounting base includes:

[0006] The main body extends along the axial direction of the casing in its longitudinal direction;

[0007] The positioning block is fixedly connected to the first end of the main body in the length direction. The positioning block includes a first arc surface for positioning, and the radius of the first arc surface is consistent with the outer circle radius of the lower mounting edge of the casing. The central axis of the first arc surface is parallel to the length direction of the main body.

[0008] The pressure block is hinged to the second end of the main body along its length. The pressure block includes a second arc surface for positioning, and the radius of the second arc surface is consistent with the outer radius of the upper mounting edge of the casing. When the pressure block is flipped around the hinge point with the main body until the central axis of the second arc surface is parallel to the central axis of the first arc surface, the maximum straight distance between the second arc surface and the first arc surface is equal to the axial height of the casing.

[0009] A pin is slidably connected to the body, and the sliding path is perpendicular to the length direction of the body. The end of the pin includes a third arc surface for pressing against the surface of the mounting base.

[0010] Alternatively, the positioning block may also include a support plane that serves as a reference for the axial height of the casing. The support plane is located between the first arc surface and the main body, and the first arc surface is perpendicularly connected to the support plane.

[0011] Alternatively, the pressure block is hinged to the second end of the main body along its length via a cylindrical pin as a pivot. The pressure block has a through groove, and a square-headed screw is installed in the through groove. The screw thread passes through the through groove and is threaded into the main body. The length of the square-headed screw head is greater than the width of the through groove, but less than the length of the through groove.

[0012] Alternatively, a groove is provided on the main body between the first end and the second end in the length direction of the main body, and one end of the pin away from the third arc surface is slidably connected in the groove. A support plate is also installed on the main body, and a threaded through hole is opened on the support plate, which communicates with the groove. A clamping screw is installed in the threaded through hole.

[0013] Furthermore, a T-shaped groove is provided at one end of the pin away from the third arc surface, and the end section of the clamping screw is T-shaped and is inserted into the T-shaped groove through this end.

[0014] A welding method for a casing mounting base, using the aforementioned simple welding fixture, includes the following steps:

[0015] Step 1: Flip the pressure block so that it rotates away from the positioning block;

[0016] Step 2: Insert the casing into the main body from the second end along the length of the main body until the lower mounting edge of the casing contacts the positioning block. Then, move the casing until the outer circle of the lower mounting edge of the casing is in close contact with the first arc surface of the positioning block.

[0017] Step 3: Flip the pressure block again until the second arc surface on the pressure block is in close contact with the outer circle of the upper mounting edge of the casing, and fix the position of the pressure block;

[0018] Step 4: Place the mounting base to be welded on the mounting base assembly position on the outer wall of the casing, adjust the positional relationship between the two until the shape of the mounting base matches the outer wall of the casing, then slide the pin until the third arc surface is pressed against the surface of the mounting base, keep the position of the pin unchanged, perform tack welding on the mounting base and the casing, and then perform welding on the mounting base and the casing.

[0019] Previously, large expansion clamps were often used to support the mounting positions of the casing when welding the mounting base. These clamps are usually large in size, expensive, and cumbersome to use. They are suitable for welding a large number of mounting bases, but are inefficient when only a small number of mounting bases need to be welded at a time.

[0020] In this invention, the pressure block can be flipped relative to the main body, replacing the existing method of overall clamping from above the casing with partial positioning clamping. This reduces the operational difficulty of overall clamping (disassembly requires lifting tools, and the heavy ring used in overall clamping makes lifting difficult); simply flipping the pressure block suffices, resulting in high efficiency and convenient assembly / disassembly. Furthermore, partial positioning clamping is more precise, making it easier to adjust the relative position of the mounting base and the casing without considering the impact of deformation of other parts of the casing on the local position.

[0021] This invention significantly reduces the size and manufacturing cost of the fixture by shrinking the support area and changing the fixture positioning method. At the same time, the reduced size also brings convenience in use, improves the efficiency of fixture loading and unloading, and improves the efficiency of parts welding. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the clamp of the present invention;

[0023] Figure 2 This is a two-dimensional schematic diagram of the working state of the fixture of the present invention, showing that only one mounting base is welded in the figure;

[0024] In the diagram, 1---main body; 2---positioning block; 3---support plate; 4---pin; 5---pressure block; 6---rectangular head screw; 7---clamping screw. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention 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.

[0026] like Figure 1 As shown, this is a simple welding fixture for a casing mounting base designed according to the present invention: it includes a main body 1, a positioning block 2, a support plate 3, a pin 4, a pressure block 5, a rectangular head screw 6, and a clamping screw 7. The functions of each component are as follows:

[0027] 1) The main body 1 is the fixture body, which provides support for the installation position and height of each component. The main body 1 is arranged parallel to the axial direction of the casing. In this embodiment, the main body 1 is a thick plate with weight reduction holes and a handle. The first end of the main body 1 in the length direction is fixedly connected to the positioning block 2 by multiple pins. The second end of the main body 1 in the length direction is provided with a hinge mounting seat for hinged connection with the pressure block 5. The main body 1 also has a sliding groove for sliding assembly of the pin 4.

[0028] 2) The positioning block 2 mainly serves as a support and positioning component. The fixture is positioned by the first arc surface of the positioning block 2 contacting the outer circle of the lower mounting edge of the casing. At the same time, a support plane on the positioning block 2 connected to the first arc surface serves as an end face support component and also as a reference for the height direction of the fixture.

[0029] 3) The support plate 3 is used in conjunction with the pin 4. The front end of the pin 4 is designed as a third arc surface to press against the inner surface of the mounting base to be welded. The rear end of the pin 4 is a T-slot to connect with the end of the clamping screw 7, so that the clamping screw 7 can push the pin 4 to slide relative to the main body 1. The support plate 3 is fixed to the main body 1 by screws, and has threaded holes that are compatible with the clamping screw 7.

[0030] 4) The pressure block 5 is a clamping and positioning component. The pressure block 5 is fixed to the main body 1 by a cylindrical pin, which can be rotated around the cylindrical pin. The pressure block 5 is also provided with a U-shaped through groove for clamping the fixture. At the same time, the pressure block 5 is provided with a second arc surface for positioning, which cooperates with the outer circle of the upper mounting edge on the upper part of the casing to achieve the positioning function. The pressure block 5 and the positioning block 2 can be used together to completely fix the fixture to the casing. This is because the straight distance between the upper end of the second arc surface on the pressure block 5 and the lower end of the first arc surface on the positioning block 2 is exactly equal to the axial height of the casing.

[0031] 5) The rectangular head screw 6 is used to fix the pressure block 5. When using it, pass its threaded section through the U-shaped groove on the pressure block 5 and align it with the threaded hole on the main body 1. Tighten it while pressing its head against the surface of the pressure block 5 to complete the fixture fixation (e.g., ...). Figure 1 When it is necessary to disassemble the clamp, rotate the rectangular head screw 6 again until its head is completely within the area defined by the U-shaped through groove (i.e., Figure 1 The pressure block 5 can be flipped over when the head length direction of the medium-length square head screw 6 is consistent with the groove length direction of the U-shaped through groove.

[0032] 6) The clamping screw 7 is used to tighten the pin 4, which can drive the pin 4 to slide relative to the main body 1, and achieves the tightening function by cooperating with the threaded hole in the support plate 3. During installation, first, the end of the pin 4 with the T-slot is exposed on the main body 1. At the same time, the clamping screw 7 is screwed into the threaded hole of the support plate 3 and the end of the clamping screw 7 is exposed. Then, the end of the clamping screw 7 (with a T-shaped cross section) is placed into the T-slot of the pin 4. Then, the support plate 3 is fixed to the main body 1 by the screw. Finally, a handle perpendicular to the clamping screw 7 is installed on the other end of the clamping screw 7 to facilitate the rotation of the clamping screw 7.

[0033] like Figure 2 As shown, Figure 2The dotted line represents the casing. During mounting bracket welding, the main body 1 of the fixture is placed perpendicular to the mounting platform. First, loosen the rectangular head screw 6, flip the pressure block 5 backward, and then place the lower mounting edge of the casing onto the positioning block 2, ensuring the outer circle of the lower mounting edge of the casing is tightly against the positioning stop (first arc surface) of the positioning block 2. Then, flip the pressure block 5 so that it is placed on the upper end face of the casing. At this point, the positioning stop (second arc surface) of the pressure block 5 is tightly against the outer circle of the upper mounting edge of the casing. Tighten the rectangular head screw 6 to complete the fixture fixing. After the fixture is fixed, place the required mounting bracket on the corresponding position on the outer wall of the casing, ensuring the mounting bracket's shape perfectly matches the outer wall of the casing. Tighten the clamping screw 7 to secure the mounting bracket through the pin 4. At this point, the tack welding process can be performed. Then, send the casing and fixture together to the argon arc welding process to complete the mounting bracket welding.

[0034] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A simple welding fixture for a casing mounting base, characterized in that, include: The main body (1) extends along the axial direction of the casing in the length direction; Positioning block (2), the positioning block (2) is fixedly connected to the first end of the body (1) in the length direction. The positioning block (2) includes a first arc surface for positioning, and the radius of the first arc surface is consistent with the outer circle radius of the lower mounting edge of the casing. The central axis of the first arc surface is parallel to the length direction of the body (1). The pressure block (5) is hinged to the second end of the body (1) in the length direction. The pressure block (5) includes a second arc surface for positioning, and the radius of the second arc surface is consistent with the outer radius of the upper mounting edge of the casing. When the pressure block (5) is flipped around the hinge point with the body (1) until the central axis of the second arc surface is parallel to the central axis of the first arc surface, the maximum straight distance between the second arc surface and the first arc surface is equal to the axial height of the casing. The pin (4) is slidably connected to the body (1) and the sliding path is perpendicular to the length direction of the body (1). The end of the pin (4) includes a third arc surface for pressing against the surface of the mounting base. The positioning block (2) also includes a support plane that serves as a reference for the axial height of the casing. The support plane is located between the first arc surface and the main body (1), and the first arc surface is vertically connected to the support plane. The pressure block (5) is hinged to the second end of the main body (1) in the length direction by a cylindrical pin as a pivot. The pressure block (5) has a through groove, and a square head screw (6) is provided in the through groove. The screw of the square head screw (6) passes through the through groove and is threaded to the main body (1). The head length of the square head screw (6) is greater than the width of the through groove, but less than the length of the through groove.

2. The simplified welding fixture for a casing mounting base according to claim 1, characterized in that: A groove is provided on the main body (1) and between the first end and the second end in the length direction of the main body (1). The end of the pin (4) away from the third arc surface is slidably connected in the groove. A support plate (3) is also installed on the main body (1). A threaded through hole is opened on the support plate (3). The threaded through hole is connected to the groove. A clamping screw (7) is installed in the threaded through hole.

3. The simplified welding fixture for a casing mounting base according to claim 2, characterized in that: The pin (4) has a T-shaped groove at one end away from the third arc surface, and the end section of the clamping screw (7) is T-shaped and is inserted into the T-shaped groove through this end.

4. A welding method for a casing mounting base, characterized in that: The simple welding fixture described in claim 1 is used, and includes the following steps: Step 1: Flip the pressure block (5) so that it rotates away from the positioning block (2); Step 2: Insert the casing into the main body (1) from the second end of the length direction of the main body (1) until the lower mounting edge of the casing contacts the positioning block (2), and translate the casing until the outer circle of the lower mounting edge of the casing is in close contact with the first arc surface of the positioning block (2); Step 3: Flip the pressure block (5) again until the second arc surface on the pressure block (5) is in close contact with the outer circle of the upper mounting edge of the casing, and fix the position of the pressure block (5); Step 4: Place the mounting base to be welded on the mounting base assembly position on the outer wall of the casing, adjust the positional relationship between the two until the shape of the mounting base matches the outer wall of the casing, then slide the pin (4) until the third arc surface presses against the surface of the mounting base, keep the position of the pin (4) unchanged, perform tack welding on the mounting base and the casing, and then perform welding on the mounting base and the casing.

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