A welding distortion control tool and method for fuel rail

Abstract

The application discloses a welding deformation control tool and method for a fuel oil manifold, which comprises a tool base plate; the tool base plate is horizontally arranged, and a fuel oil manifold to be welded is horizontally and concentrically arranged above the tool base plate; a plurality of main oil pipe positioning seats are uniformly arranged along the circumference of a ring-shaped main oil pipe in the fuel oil manifold to be welded; wherein the bottom end of the main oil pipe positioning seat is vertically connected with the tool base plate, and the top end of the main oil pipe positioning seat is provided with an oil pipe positioning groove, and the ring-shaped main oil pipe is matched and clamped in the oil pipe positioning groove; a plurality of three-way pipe positioning seats are arranged in one-to-one correspondence with three-way joints in the fuel oil manifold to be welded; wherein the bottom end of the three-way pipe positioning seat is vertically connected with the tool base plate, and the top end of the three-way pipe positioning seat is provided with a joint positioning groove, and the three-way joint is matched and clamped in the joint positioning groove; the application satisfies one-time assembly, welding and inspection operation of the fuel oil manifold assembly, can effectively control welding deformation in the welding process of the fuel oil manifold, and improves product quality and processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of welding and processing technology for aero-engine pipe assemblies, and specifically relates to a welding deformation control tool for fuel main pipe and its application method. Background Technology

[0002] The fuel manifold, as an important component of the fuel supply system of the combustion chamber of an aero-engine, is used to uniformly supply fuel to the fuel nozzles. In a certain type of aero-engine, the fuel manifold consists of several tee joints threaded onto a ring-shaped main fuel pipe and welded to the ring-shaped main fuel pipe as a whole. The several tee joints are evenly distributed on the ring-shaped main fuel pipe, and the two sides of each tee joint form a ring-shaped angular contact argon arc weld with the ring-shaped main fuel pipe, resulting in a large number of welds.

[0003] Currently, the welding process for fuel mains is usually carried out in a step-by-step welding method, which involves assembling, welding and aligning several tee joints in multiple stages. Multiple welding processes can easily lead to unstable weld quality, low welding efficiency and difficulty in controlling welding deformation. Since welding deformation often causes deviations in the shape of the pipe and the position of the tee joints after welding, it can have an adverse effect on the final size of the fuel main and the position of the joints. Furthermore, repeated alignment of the tank body can easily cause micro-cracks and damage to the base material, which will seriously affect the service life of the fuel main. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a welding deformation control tooling and method for fuel manifold, so as to solve the technical problems that when the fuel manifold is processed by step welding method in the prior art, it is easy to have an adverse effect on the final size and joint position of the fuel manifold, resulting in low welding efficiency and seriously affecting the service life of the fuel manifold.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a welding deformation control fixture for a fuel main pipe, including a fixture base plate, a plurality of main oil pipe positioning seats and a plurality of tee positioning seats;

[0007] The tooling base plate is horizontally set, and the fuel main pipe to be welded is horizontally and concentrically set above the tooling base plate; a plurality of main oil pipe positioning seats are evenly arranged along the circumference of the annular main oil pipe in the fuel main pipe to be welded; wherein, the bottom end of the main oil pipe positioning seat is vertically connected to the tooling base plate, and the top end of the main oil pipe positioning seat is provided with an oil pipe positioning groove, and the annular main oil pipe is fitted and locked in the oil pipe positioning groove.

[0008] Several tee positioning seats are provided one-to-one with the tee connectors in the fuel main pipe to be welded; wherein, the bottom end of the tee positioning seat is vertically connected to the tooling base plate, and the top end of the tee positioning seat is provided with a connector positioning groove, and the tee connector is fitted and locked in the connector positioning groove.

[0009] Furthermore, it also includes a clamping block and a clamping bolt; the clamping block is horizontally disposed above the top of the main oil pipe positioning seat, the first end of the clamping block is connected to one side of the top of the main oil pipe positioning seat through the clamping bolt, the second end of the clamping block extends toward the upper side of the oil pipe positioning groove, and the lower part of the second end of the clamping block abuts against the upper surface of the annular main oil pipe.

[0010] Furthermore, the tubing positioning groove is provided on the side near the center of the tooling base plate; the tubing positioning groove is a U-shaped through groove with an open top, and the center line of the tubing positioning groove is parallel to the central axis of the annular main tubing.

[0011] Furthermore, the outer diameter R1 of the inner groove of the oil pipe positioning groove matches the designed inner diameter of the fuel main pipe to be welded; the inner diameter R2 of the outer groove of the oil pipe positioning groove is:

[0012]

[0013] Where, r max r is the maximum bending radius of the annular main oil pipe. w It is half the outer diameter of the annular main oil pipe; v is the cumulative welding shrinkage.

[0014] Furthermore, the three-way positioning seat includes a positioning seat body, a movable block, and a positioning pin;

[0015] The bottom end of the positioning seat body is vertically connected to the upper surface of the tooling base plate, and the top end of the positioning seat body is connected to the bottom end of the movable block; the two sides of the top end of the movable block extend vertically upward to form two positioning ears; the joint positioning groove is formed between the two positioning ears; wherein, the opening direction of the joint positioning groove is the same as the radial direction of the fuel main pipe to be welded.

[0016] The positioning ear is provided with a positioning pin mounting hole. The positioning pin passes through the positioning pin mounting hole on one of the positioning ears, the preset through hole on the tee connector, and the positioning pin mounting hole on the other positioning ear in sequence, so as to connect the movable block with the tee connector.

[0017] Furthermore, a sliding groove is provided at the top of the positioning seat body, and a sliding block is provided at the bottom of the movable block, with the sliding block fitting in the sliding groove; wherein, the axial direction of the sliding groove is the same as the radial direction of the fuel main pipe to be welded.

[0018] Limiting plates are also provided on both sides of the sliding groove. One end of the limiting plate is connected to the top of the positioning seat body by bolts, and the other side of the limiting plate abuts against the upper surface of the sliding block.

[0019] Furthermore, the bottom end of the positioning seat body is fixedly connected to the tooling base plate by bolts.

[0020] Furthermore, the bottom end of the main oil pipe positioning seat is fixedly connected to the tooling base plate by bolts.

[0021] Furthermore, a process ball is also provided at the center of the upper surface of the tooling base plate.

[0022] The present invention also provides a method for controlling welding deformation of a fuel main pipe, utilizing the aforementioned tooling for controlling welding deformation of a fuel main pipe;

[0023] The welding deformation control method includes the following steps:

[0024] The tee fitting is threaded onto the annular main oil pipe;

[0025] Insert the annular main oil pipe into the oil pipe positioning groove of the main oil pipe positioning seat;

[0026] Move the tee fittings on the annular main oil pipe so that the tee fittings correspond one-to-one with the tee positioning seats;

[0027] All tee fittings are respectively engaged and locked into the fitting positioning grooves of the corresponding tee positioning seats;

[0028] Tack welding is performed at the connection between the tee joint and the annular main oil pipe. After the tack welding is completed, the fuel main pipe is removed, and then the weld on the fuel main pipe is treated with argon arc welding.

[0029] After completing the argon arc welding of all welds, the fuel main pipe is reinstalled into the welding deformation control fixture. The pipe shape of the annular main oil pipe and the angular position of the tee joint are inspected to obtain the processed fuel main pipe.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention provides a fixture and method for controlling welding deformation of a fuel main pipe. By setting several main oil pipe positioning seats on the fixture base plate, the annular main oil pipe is fitted into the oil pipe positioning groove of the main oil pipe positioning seat, thus achieving the positioning function of the annular main oil pipe. Similarly, by setting several tee positioning seats on the fixture base plate, tee connectors are fitted into the connector positioning grooves of the tee positioning seats, thus achieving the positioning function of the tee connectors. The device has a simple structure and is easy to operate, meeting the requirements for one-time assembly, welding, and inspection of fuel main pipe assemblies. It can effectively control welding deformation during the fuel main pipe welding process. Simultaneously, it avoids micro-cracks or substrate damage caused by repeated pipe reshaping, improving product quality and processing efficiency, and ensuring product service life.

[0032] Furthermore, by setting a clamping block above the top of the main oil pipe positioning seat, a vertical limiting effect is achieved on the annular main oil pipe, preventing the annular main oil pipe from falling out of the oil pipe shaping groove and ensuring the precise positioning of the annular main oil pipe.

[0033] Furthermore, the oil pipe positioning groove is equipped with a U-shaped through groove with an open top, which facilitates the installation and disassembly of the annular main oil pipe. The outer diameter of the inner groove surface of the oil pipe positioning groove is matched with the designed inner diameter of the fuel main pipe to be welded. The cumulative welding shrinkage is pre-set in the inner diameter design of the outer groove surface of the oil pipe positioning groove to effectively control welding deformation and ensure the product accuracy of the fuel main pipe.

[0034] Furthermore, by using a locating pin to connect the movable block in the tee positioning seat to the tee connector, the precise positioning and inspection requirements of the tee connector can be achieved. The structure is simple and easy to install and disassemble.

[0035] Furthermore, a sliding groove-slider mechanism is used to connect the movable block and the positioning seat body to achieve fine-tuning of the position of the tee joint and meet the welding positioning control requirements of different models of fuel main pipes.

[0036] Furthermore, a process ball is set at the center of the upper surface of the tooling base plate, and the process ball is used as a reference to determine the center of the fuel main pipe to ensure the accuracy of welding deformation control. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the fuel main pipe in a certain type of engine in the embodiment;

[0038] Figure 2 This is a schematic diagram showing the usage state of the welding deformation control fixture for the fuel main pipe described in the embodiment.

[0039] The components include: 1. Tooling base plate; 2. Main oil pipe positioning seat; 3. T-joint positioning seat; 4. Process ball; 5. Clamping block; 6. Clamping bolt; 100. Annular main oil pipe; 200. T-joint; 21. Oil pipe positioning groove; 31. Positioning seat body; 32. Movable block; 33. Positioning pin; 34. Limiting plate. Detailed Implementation

[0040] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0041] This invention provides a welding deformation control fixture for a fuel main pipe, comprising a fixture base plate 1, a plurality of main oil pipe positioning seats 2, a plurality of tee positioning seats 3, a process ball 4, a clamping block 5, and a clamping bolt 6; the fixture base plate 1 is horizontally arranged, and the fuel main pipe to be welded is horizontally concentrically arranged above the fixture base plate 1; the plurality of main oil pipe positioning seats 2 are evenly distributed along the circumference of the annular main oil pipe 100 in the fuel main pipe to be welded; wherein, the bottom end of the main oil pipe positioning seat 2 is vertically connected to the fixture base plate 1, and the top end of the main oil pipe positioning seat 2 is provided with an oil pipe positioning groove 21, and the annular main oil pipe 100 is fitted and locked in the oil pipe positioning groove 21; the plurality of tee positioning seats 3 are arranged one-to-one with the tee joints 200 in the fuel main pipe to be welded; wherein, the bottom end of the tee positioning seat 3 is vertically connected to the fixture base plate 1, and the top end of the tee positioning seat 3 is provided with a joint positioning groove, and the tee joint 200 is fitted and locked in the joint positioning groove.

[0042] In this invention, the three-way positioning seat 3 includes a positioning seat body 31, a movable block 32, and a positioning pin 33. The bottom end of the positioning seat body 31 is vertically connected to the upper surface of the tooling base plate 1, and the top end of the positioning seat body 31 is slidably connected to the bottom end of the movable block 32, with the sliding direction of the movable block 32 being the same as the radial direction of the fuel main pipe. The two sides of the top end of the movable block 32 extend vertically upward to form two positioning ears. A joint positioning groove is formed between the two positioning ears. The opening direction of the joint positioning groove is the same as the radial direction of the fuel main pipe to be welded. A positioning pin mounting hole is provided on the positioning ear, and the positioning pin 33 passes through the positioning pin mounting hole on one positioning ear, the preset through hole on the three-way connector 200, and the positioning pin mounting hole on the other positioning ear in sequence to connect the movable block 32 and the three-way connector 200.

[0043] In this invention, the process ball 4 is disposed at the center of the upper surface of the tooling base plate 1; the clamping block 5 is horizontally disposed above the top of the main oil pipe positioning seat 2, the first end of the clamping block 5 is connected to one side of the top of the main oil pipe positioning seat 2 through the clamping bolt 6, the second end of the clamping block 5 extends toward the upper side of the oil pipe positioning groove 21, and the lower part of the second end of the clamping block 5 abuts against the upper surface of the annular main oil pipe 100.

[0044] Working principle and welding deformation control methods:

[0045] When controlling the welding deformation of the fuel main pipe using the welding deformation control fixture described in this invention, firstly, the tee connector 200 is inserted onto the annular main oil pipe 100; then, the annular main oil pipe 100 is installed into the oil pipe positioning groove of the main oil pipe positioning seat 2; next, the tee connector 200 on the annular main oil pipe 100 is moved so that the tee connector 200 corresponds one-to-one with the tee positioning seat 3; next, all tee connectors 200 are fitted and respectively locked into the connector positioning grooves of the corresponding tee positioning seats 3; next, the connection between the tee connector 200 and the annular main oil pipe 100 is tack welded; after the tack welding is completed, the fuel main pipe is removed, and then the welds on the fuel main pipe are argon arc welded; after the argon arc welding of all welds is completed, the fuel main pipe is reinstalled into the welding deformation control fixture, and the pipe shape of the annular main oil pipe and the angular position of the tee connector are inspected to obtain the processed fuel main pipe.

[0046] In this invention, the tooling base plate 1 is a circular plate structure. The upper surface of the tooling base plate 1 is provided with positioning pins and screw holes for installing the main oil pipe positioning seat 2 and the tee positioning seat 3. A process ball 4 for determining the reference is provided at the center of the tooling base plate 1. The bottom end of the main oil pipe positioning seat 2 is assembled and connected to the tooling base plate 1. The top end of the main oil pipe positioning seat 2 is provided with an oil pipe positioning groove 21 for positioning and installing the annular main oil pipe. Specifically, in the oil pipe positioning groove 21, the outer diameter of the groove surface near the inner side of the bend of the annular main oil pipe 100 is designed according to the drawing dimensions of the annular main oil pipe 100, and the inner diameter of the groove surface near the outer side of the bend of the annular main oil pipe 100 is calculated as the maximum bending radius of the annular main oil pipe 100 plus half of the outer diameter of the annular main oil pipe. The design is based on half of the cumulative welding shrinkage / 3.14; the bottom end of the positioning seat body 31 is assembled and connected to the tooling base plate 1, the top end of the positioning seat body 31 is provided with a sliding groove, and the lower end of the movable block 32 is fitted in the sliding groove to realize the sliding of the movable block 32; the top end of the movable block 32 is provided with a groove for positioning and installing the tee connector 200 and a positioning pin mounting hole; the positioning pin 33 is a cylindrical structure, which can realize the positioning of the tee connector 200 on the annular main oil pipe 100 by inserting it into the mounting hole on the movable block 32 and the preset through hole on the tee connector 200; the clamping block 5 is a strip structure, which is installed on the top end of the main oil pipe positioning seat 2 to realize the clamping of the annular main oil pipe 100.

[0047] The welding deformation control fixture and method for fuel main pipe described in this invention positions the annular main oil pipe within the oil pipe positioning groove of the main oil pipe positioning seat; and positions the tee connector within the connector positioning groove of the tee positioning seat. This allows for one-time assembly, welding, and inspection of the fuel main pipe assembly, effectively controlling welding deformation during the fuel main pipe welding process. Simultaneously, it avoids micro-cracks or substrate damage caused by repeated pipe reshaping, improving product quality and processing efficiency.

[0048] Example

[0049] This embodiment takes the welding process of the fuel main pipe in a certain type of engine as an example; wherein, as shown in the attached... Figure 1 As shown, the fuel main pipe includes an annular main oil pipe 100 and ten tee joints 200. The ten tee joints 200 are evenly distributed on the annular main oil pipe 100, and an annular corner joint argon arc weld is formed between the two sides of each tee joint 200 and the annular main oil pipe 100.

[0050] As attached Figure 2As shown, this embodiment provides a welding deformation control fixture for the fuel main pipe, including a fixture base plate 1, five main oil pipe positioning seats 2, ten tee positioning seats 3, process balls 4, five clamping blocks 5, and five clamping bolts 6.

[0051] The tooling base plate 1 is a circular plate structure, and the tooling base plate 1 is set horizontally. The fuel main pipe to be welded is set horizontally and concentrically above the tooling base plate 1. The five main oil pipe positioning seats 2 are distributed in a circle on the upper surface of the tooling base plate 1. The five main oil pipe positioning seats 2 are evenly distributed along the circumference of the annular main oil pipe 100, and the five main oil pipe positioning seats 2 are all located on the outer side of the circumference of the annular main oil pipe 100. The bottom end of the main oil pipe positioning seat 2 is vertically connected to the tooling base plate 1, and the top end of the main oil pipe positioning seat 2 is used to position the annular main oil pipe 100.

[0052] Ten tee positioning seats 3 are arranged in a circular pattern on the upper surface of the tooling base plate 1 and are evenly distributed along the circumference of the annular main oil pipe 100. All ten tee positioning seats 3 are located on the inner side of the circumference of the annular main oil pipe 100. The ten tee positioning seats 3 are arranged in a one-to-one correspondence with the ten tee connectors 200. The bottom end of the tee positioning seat 3 is perpendicularly connected to the tooling base plate 1, and the top end of the tee positioning seat 3 is used to position the tee connectors 200.

[0053] In this embodiment, the main oil pipe positioning seat 2 is a column-shaped structure, and its bottom end is vertically connected to the tooling base plate 1. The bottom end of the main oil pipe positioning seat 2 and the tooling base plate 1 are fixedly connected by bolts or screws. Specifically, the bottom ends of the main oil pipe positioning seat 2 extend horizontally to form positioning seat fixing parts, each positioning seat fixing part having a first bolt through hole, and the tooling base 1 having a first bolt fixing hole. The first bolt fixing hole corresponds to the first bolt through hole, and the bolt or screw passes through the first bolt through hole and is then fixed to the tooling base 1. The main oil pipe positioning seat 2 is fixedly connected to the tooling base plate 1 in the first bolt fixing hole. It should be noted that the tooling base plate 1 is also provided with a first positioning pin, and the positioning seat fixing part is also provided with a first pin hole. The lower end of the first positioning pin is fixedly connected to the tooling base plate 1, and the upper end of the first positioning pin is inserted into the first pin hole. The positioning function of the main oil pipe positioning seat 2 is achieved by the cooperation between the first positioning pin and the first pin hole. The first bolt through hole or the first pin hole on the same main oil pipe positioning seat 2 is arranged diagonally.

[0054] The top of the main oil pipe positioning seat 2 is provided with an oil pipe positioning groove 21, and the annular main oil pipe 100 is fitted and locked in the oil pipe positioning groove 21; wherein, the oil pipe positioning groove 21 is located at the top of the main oil pipe positioning seat 2 and is set on one side close to the center of the tooling base plate 1; the oil pipe positioning groove 21 is a U-shaped through groove with an open top, and the center line of the oil pipe positioning groove 21 is parallel to the central axis of the annular main oil pipe 100; preferably, the outer diameter R1 of the inner groove surface of the oil pipe positioning groove 21 matches the designed inner diameter of the fuel main pipe to be welded; the inner diameter R2 of the outer groove surface of the oil pipe positioning groove 21 is:

[0055]

[0056] Where, r max r is the maximum bending radius of the annular main oil pipe 100; w It is half the outer diameter of the annular main oil pipe; v is the cumulative welding shrinkage.

[0057] In this embodiment, the three-way positioning seat 3 includes a positioning seat body 31, a movable block 32, and a positioning pin 33; both the positioning seat body 31 and the movable block 32 are column-shaped structures; the bottom end of the positioning seat body 31 is vertically connected to the upper surface of the tooling base plate 1, and the top end of the positioning seat body 31 is connected to the bottom end of the movable block 32; wherein, the bottom end of the main oil pipe positioning seat 2 is fixedly connected to the tooling base plate 1 by bolts or screws, and the positioning seat body 31 and the movable block 32 are slidably connected.

[0058] Specifically, the bottom ends of the positioning base body 31 extend horizontally to form a body fixing part. Each body fixing part has two symmetrically arranged second bolt through holes. The tooling base 1 has a second bolt fixing hole. The second bolt fixing hole and the second bolt through hole are arranged one-to-one. After the bolt or screw passes through the second bolt through hole, it is fixed in the second bolt fixing hole, thus fixing the positioning base body 31 to the tooling base plate 1. It should be noted that the tooling base plate 1 is also provided with a second positioning pin, and the body fixing part is also provided with a second pin hole. The second pin hole is located between the two second bolt through holes. The lower end of the second positioning pin is fixedly connected to the tooling base plate 1, and the upper end of the second positioning pin is inserted into the second pin hole, so as to realize the positioning function of the positioning base body 31 by the cooperation of the second positioning pin and the second pin hole.

[0059] The top end of the positioning seat body 31 is provided with a sliding groove, and the bottom end of the movable block 32 is provided with a sliding block. The sliding block is fitted into the sliding groove. The axial direction of the sliding groove is the same as the radial direction of the fuel main pipe to be welded. That is, the sliding direction of the movable block 32 is the same as the radial direction of the fuel main pipe to be welded. Limiting plates 34 are also provided on both sides of the sliding groove. One end of the limiting plate 34 is connected to the top end of the positioning seat body 31 by bolts, and the other side of the limiting plate 34 abuts against the upper surface of the sliding block to limit and fix the sliding block, thereby restricting the horizontal sliding of the movable block 32.

[0060] The top two sides of the movable block 32 extend vertically upward to form two positioning ears, and a joint positioning groove is formed between the two positioning ears; wherein, the opening direction of the positioning groove is the same as the radial direction of the fuel main pipe to be welded; a positioning pin mounting hole is provided on the positioning ear, and the positioning pin 33 passes through the positioning pin mounting hole on one of the positioning ears, the preset through hole on the tee connector 200 and the positioning pin mounting hole on the other positioning ear in sequence, so as to connect the movable block 32 with the tee connector 200.

[0061] In this embodiment, the process ball 4 is disposed on the upper surface of the tooling base plate 1; wherein, the process ball 4 is used to provide the installation reference for the annular main oil pipe 100, the main oil pipe positioning seat 2 and the tee positioning seat 3.

[0062] In this embodiment, the clamping block 5 is horizontally positioned above the top of the main oil pipe positioning seat 2; the first end of the clamping block 5 is connected to one side of the top of the main oil pipe positioning seat 2 via the clamping bolt 6, and the second end of the clamping block 5 extends towards the upper side of the oil pipe positioning groove 21, with the lower part of the second end of the clamping block 5 abutting against the upper surface of the annular main oil pipe 100; wherein, the clamping block 5 adopts a strip-shaped plate structure, and an oblong hole is provided in the center of the clamping block 5, through which the clamping bolt 6 passes. By providing an oblong hole on the clamping block 5, it is convenient to adjust the clamping length of the clamping block 5 on the annular main oil pipe 100, and to facilitate the removal of the annular main oil pipe 100 from the oil pipe positioning groove 21.

[0063] This embodiment also provides a method for controlling welding deformation of the fuel main pipe, specifically including the following steps:

[0064] Step 1: Fit the tee connector 200 onto the annular main oil pipe 100. At this time, the tee connector 200 can move or rotate along the axis of the annular main oil pipe 100.

[0065] Step 2: Insert the annular main oil pipe 100 into the oil pipe positioning groove 21 of the main oil pipe positioning seat 2, ensuring that the curved outer side of the annular main oil pipe 100 is in contact with the outer groove surface of the oil pipe positioning groove 21 and is pressed tightly by the clamping block 5.

[0066] Step 3: Move the tee connector 200 on the annular main oil pipe 100 so that it is close to the tee positioning seat 3.

[0067] Step 4: Slide the movable block while rotating the tee connector so that the tee connector 200 is engaged in the connector positioning groove of the movable block 32.

[0068] Step 5: Pass the positioning pin 33 through the positioning pin mounting hole on the movable block 32 and the preset through hole on the tee connector 200.

[0069] Step 6: Repeat steps 3-5 to assemble all ten tee connectors 200 into their designated positions.

[0070] Step 7: Use argon arc welding to perform tack welding on the connection between the tee joint and the annular main oil pipe on the tooling.

[0071] Step 8: Remove the fuel main pipe from the tooling and perform argon arc welding.

[0072] Step 9: After completing all welds, reinstall the fuel main pipe into the tooling and inspect the pipe shape and the angular position of the tee joint. If the inner side of the bend of the annular main oil pipe fits the inner groove of the oil pipe positioning groove of the main oil pipe positioning seat, the pipe shape meets the design requirements. If the tee joint can be inserted into the joint positioning groove of the movable block, and the positioning pin can pass through the mounting hole on the movable block and the hole on the tee joint, the angular position of the tee joint meets the design requirements.

[0073] The welding deformation control fixture and method for fuel main pipe described in this invention enables the assembly, welding and inspection of this type of component in one step by pre-setting the welding shrinkage amount. It effectively controls welding deformation and avoids micro-cracks and base damage that are easily caused by repeated pipe body reshaping. It achieves the purpose of controlling welding deformation, improving welding efficiency, and enhancing product quality and processing efficiency.

[0074] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A welding deformation control fixture for a fuel main pipe, characterized in that, Includes tooling base plate (1), several main oil pipe positioning seats (2) and several tee positioning seats (3); The tooling base plate (1) is horizontally set, and the fuel main pipe to be welded is horizontally concentrically set above the tooling base plate (1); a plurality of main oil pipe positioning seats (2) are evenly arranged along the circumference of the annular main oil pipe (100) in the fuel main pipe to be welded; wherein, the bottom end of the main oil pipe positioning seat (2) is vertically connected to the tooling base plate (1), and the top end of the main oil pipe positioning seat (2) is provided with an oil pipe positioning groove (21), and the annular main oil pipe (100) is fitted and locked in the oil pipe positioning groove (21); Several tee positioning seats (3) are provided one-to-one with the tee joints (200) in the fuel main pipe to be welded; wherein, the bottom end of the tee positioning seat (3) is vertically connected to the tooling base plate (1), and the top end of the tee positioning seat (3) is provided with a joint positioning groove, and the tee joint (200) is fitted and locked in the joint positioning groove. The outer diameter of the inner groove surface of the tubing positioning groove (21) Matching the design inner diameter of the fuel main to be welded; the inner diameter of the outer groove profile of the oil pipe positioning groove (21) for: in, The maximum bending radius of the annular main oil pipe (100); It is half the outer diameter of the annular main oil pipe; This represents the cumulative welding shrinkage. The three-way positioning seat (3) includes a positioning seat body (31) and a movable block (32); the top end of the positioning seat body (31) is provided with a sliding groove, and the bottom end of the movable block (32) is provided with a sliding block, which is fitted in the sliding groove; wherein, the axial direction of the sliding groove is the same as the radial direction of the fuel main pipe to be welded. The three-way positioning seat (3) also includes a positioning pin (33); The bottom end of the positioning seat body (31) is vertically connected to the upper surface of the tooling base plate (1), and the top end of the positioning seat body (31) is connected to the bottom end of the movable block (32); the two sides of the top end of the movable block (32) extend vertically upward to form two positioning ears; the two positioning ears form the joint positioning groove; wherein, the opening direction of the joint positioning groove is the same as the radial direction of the fuel main pipe to be welded; The positioning ear is provided with a positioning pin mounting hole. The positioning pin (33) passes through the positioning pin mounting hole on one of the positioning ears, the preset through hole on the three-way connector (200) and the positioning pin mounting hole on the other positioning ear in sequence, so as to connect the movable block (32) with the three-way connector (200).

2. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, It also includes a clamping block (5) and a clamping bolt (6); the clamping block (5) is horizontally positioned above the top of the main oil pipe positioning seat (2), the first end of the clamping block (5) is connected to one side of the top of the main oil pipe positioning seat (2) through the clamping bolt (6), the second end of the clamping block (5) extends toward the upper side of the oil pipe positioning groove (21), and the lower part of the second end of the clamping block (5) abuts against the upper surface of the annular main oil pipe (100).

3. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, The oil pipe positioning groove (21) is set on the side close to the center of the tooling base plate (1); the oil pipe positioning groove (21) is a U-shaped through groove with an open top, and the center line of the oil pipe positioning groove (21) is set parallel to the center axis of the annular main oil pipe (100).

4. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, Limiting plates (34) are also provided on both sides of the sliding groove. One end of the limiting plate (34) is connected to the top of the positioning seat body (31) by bolts, and the other side of the limiting plate (34) abuts against the upper surface of the sliding block.

5. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, The bottom end of the positioning seat body (31) is fixedly connected to the tooling base plate (1) by bolts.

6. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, The bottom end of the main oil pipe positioning seat (2) is fixedly connected to the tooling base plate (1) by bolts.

7. The welding deformation control fixture for a fuel main pipe according to claim 1, characterized in that, The tooling base plate (1) also has a process ball (4) at the center of its upper surface.

8. A method for controlling welding deformation in a fuel main, characterized in that, Using a welding deformation control fixture for a fuel main pipe as described in any one of claims 1-7; The welding deformation control method includes the following steps: The tee fitting (200) is threaded onto the annular main oil pipe (100); Insert the annular main oil pipe (100) into the oil pipe positioning groove of the main oil pipe positioning seat (2); Move the tee joint (200) on the annular main oil pipe (100) so that the tee joint (200) corresponds one-to-one with the tee positioning seat (3); All tee connectors (200) are fitted and respectively locked into the connector positioning grooves of the corresponding tee positioning seats (3); The connection between the tee joint (200) and the annular main oil pipe (100) is tack welded. After the tack weld is completed, the fuel main pipe is removed, and then the weld on the fuel main pipe is argon arc welded. After completing the argon arc welding of all welds, the fuel main pipe is reinstalled into the welding deformation control fixture. The pipe shape of the annular main oil pipe and the angular position of the tee joint are inspected to obtain the processed fuel main pipe.

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