A control method for preventing thermal deformation of exhaust manifold half shell welding nozzle

Abstract

The present invention discloses a control method for preventing thermal deformation of exhaust manifold half-shell welding pipe openings, which relates to the exhaust manifold welding technical field, including a protective frame, a welding groove is provided on the protective frame, and fixing rings are rotatably provided at both ends of the protective frame, a cylindrical fixing column is provided in the protective frame, and a plurality of limit grooves are provided in an annular manner on the inner wall of the fixing column, and cooling copper tubes are slidably provided in the limit grooves, and cooling copper tubes are provided in the cooling copper tubes. A driving component for controlling the movement of the cooling copper tubes is provided in the protective frame, which is used to cool down the welding position during the welding process. The present invention welds the pipe openings through the welding grooves on the protective frame, and rotates the protective frame during welding to allow the welding grooves to be located at different positions of the pipe openings. The protective frame drives the driving component to allow the cooling copper tube located at the welding groove position to leave the welding groove position. When the welding groove moves to another position, the cooling copper tube returns to the welding position to cool down the welding position to avoid thermal deformation.

Description

Technical Field

[0001] The invention relates to the field of exhaust manifold welding, and in particular to a control method for preventing thermal deformation of exhaust manifold half-shell welding pipe openings. Background Art

[0002] With the rapid development of the automobile industry, automobile exhaust manifolds are an important part of the engine, and their manufacturing quality is directly related to the performance and life of the car. In the manufacturing process of exhaust manifolds, half-shell welding is one of the key processes. However, due to the thermal stress generated during the welding process, the exhaust manifold often undergoes thermal deformation, which not only affects the accuracy of the manifold, but may also cause the engine performance to decline.

[0003] In the prior art, welding fixtures are often used to fix the pipe openings of the two exhaust manifolds. The thermal stress generated during the welding process is limited by the fixing effect of the fixture alone. When the temperature at the welding point is too high, thermal deformation will still occur, thereby reducing the manufacturing accuracy and quality of the exhaust manifold. Summary of the invention

[0004] The purpose of the present invention is to solve the disadvantage of limited effect of exhaust manifold welding fixture in the prior art, and to propose a control method for preventing thermal deformation of exhaust manifold half-shell welding pipe openings.

[0005] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0006] A method for preventing thermal deformation of exhaust manifold half-shell welding pipe openings, comprising a protection frame, a welding groove is provided on the protection frame, fixing rings are rotatably provided at both ends of the protection frame, a cylindrical fixing column is provided in the protection frame, a plurality of limit grooves are annularly provided on the inner wall of the fixing column, cooling copper tubes are slidably provided in the limit grooves, cooling liquid is provided in the cooling copper tubes, and a driving component for controlling the movement of the cooling copper tubes is provided in the protection frame, so as to cool down the welding point during the welding process;

[0007] The driving assembly comprises a driving ring installed on the inner wall of the protection frame, a driving groove is opened on the driving ring, a driving rod is fixedly provided at one end of the cooling copper tube, a spring is sleeved on the driving rod, a limiting block is fixedly provided at one end of the inner wall of the limiting groove, one end of the driving rod passes through the limiting block, and one end of the spring is in contact with one side of the limiting block;

[0008] The fixing ring and the fixing column are both provided with fixing components connected to the outer wall of the exhaust manifold, and are used to align the pipe openings of the two exhaust manifolds. The fixing components include three fixing plates fixedly mounted on one end of the fixing column, and the fixing plates are all threaded with first screws. The fixing ring is threaded with three second screws, and the lower ends of the first screws and the second screws are both fixed with rubber pads.

[0009] A fixing rod is fixedly provided on the inner wall of the protection frame, a cylindrical retaining ring is fixedly provided on the end of the fixing rod, a spherical block is fixedly provided on the end of each driving rod, the spherical block fits with the end of the driving ring, a push rod is fixedly provided on the outer wall of the protection frame, a clamping block is fixedly provided on the end of the push rod.

[0010] Preferably, three mounting grooves are provided on the protective frame.

[0011] Preferably, both ends of the protective frame are provided with rotation grooves, and one side of the fixing ring is fixedly provided with a rotation block, the cross section of the rotation block is T-shaped, and the rotation block fits with the inner wall of the rotation groove.

[0012] A method for preventing thermal deformation of exhaust manifold half-shell welded pipe openings includes the following steps:

[0013] S1. Insert the two exhaust manifolds from both ends of the protection frame respectively, so that the exhaust manifold welding point is located at the welding groove position, the outer wall of the exhaust manifold fits with the fixing column and the inner wall of the cooling copper tube, and the inner wall of the driving ring is larger than the exhaust manifold;

[0014] S2. Rotate the second screw rod to move inward along the fixing ring, so that the rubber pad at the end of the second screw rod fits against the outer wall of the exhaust manifold, and fix the positions of the two exhaust manifolds. Then, use a tool to pass through the mounting groove to rotate the first screw rod, so that the first screw rod moves along the fixing plate, so that the rubber pad at the end of the second screw rod fits against the outer wall of the exhaust manifold, and fix the fixing column and the exhaust manifold.

[0015] S3. Use a welding gun to pass through the welding groove to weld the exhaust manifold connection. After the exhaust manifold at the welding groove position is welded, rotate the protective frame to transfer the welding groove, and weld other positions of the exhaust manifold. The rotation of the protective frame will drive the drive ring to rotate. The drive groove and the welding groove on the drive ring are located in the same plane. When the drive groove is parallel to the drive rod, the spherical block at the end of the drive rod enters the bottom of the drive groove through the spring rebound force. The drive rod drives the cooling copper tube to move along the limit groove, allowing the cooling copper tube to leave the welding groove position for easy welding. When the drive ring rotates again, the drive rod in the drive groove will move along the slope surface of the drive groove to the end of the drive groove. The drive rod drives the cooling copper tube to the welding groove position, and the coolant in the cooling copper tube is used to quickly cool the position after welding to avoid thermal deformation. Finally, loosen the first screw and the second screw to pull the protective frame out from the unwelded end of the exhaust manifold.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, the protective frame is sleeved on the two exhaust manifold welding positions, and the fixing ring is fixed to the exhaust manifold position by a fixing assembly. A plurality of cooling copper tubes are arranged on the fixing column in the protective frame. The cooling copper tubes are located at the welding position to cool the welding position. The pipe opening is welded through the welding groove on the protective frame. During welding, the protective frame is rotated to make the welding groove located at different positions of the pipe opening. The protective frame drives the driving assembly to make the cooling copper tube located at the welding groove position leave the welding groove position. When the welding groove moves to another position, the cooling copper tube returns to the welding position to cool the welding position to avoid thermal deformation.

[0018] 2. In the present invention, the second screw is rotated to fit the rubber pad at the end of the second screw with the outer wall of the exhaust manifold to fix the positions of the two exhaust manifolds. The first screw is rotated through the installation groove by a tool, and the first screw moves along the fixing plate to fit the rubber pad at the end with the outer wall of the exhaust manifold to fix the fixing column and the exhaust manifold, thereby increasing the installation speed and facilitating welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the connection structure between the protection frame and the fixing ring of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the protection frame of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the driving ring of the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the cooling copper tube of the present invention.

[0026] Serial numbers in the figure: 1. Protective frame; 11. Welding groove; 12. Fixing ring; 13. Fixing column; 14. Limiting groove; 15. Cooling copper tube; 16. Cooling liquid; 17. Driving rod; 18. Spring; 19. Driving ring; 191. Driving groove; 192. Limiting block; 2. Fixing plate; 21. First screw; 22. Second screw; 23. Rubber pad; 3. Mounting groove; 4. Rotating groove; 41. Rotating block; 5. Fixing rod; 51. Retaining ring; 6. Spherical block; 7. Push rod; 71. Clamping block. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Embodiment: This embodiment provides a method for preventing thermal deformation of exhaust manifold half shell welding nozzles, see Figure 1-6 Specifically, it includes a protection frame 1, a welding groove 11 is opened on the protection frame 1, fixing rings 12 are rotatably provided at both ends of the protection frame 1, a cylindrical fixing column 13 is provided in the protection frame 1, and a plurality of limiting grooves 14 are annularly opened on the inner wall of the fixing column 13, cooling copper tubes 15 are slidably provided in the limiting grooves 14, and cooling copper tubes 15 are provided with coolant 16, and a driving component for controlling the movement of the cooling copper tube 15 is provided in the protection frame 1, so as to cool down the welding part during the welding process;

[0029] The driving assembly includes a driving ring 19 installed on the inner wall of the protection frame 1, and a driving groove 191 is opened on the driving ring 19. A driving rod 17 is fixedly provided at one end of the cooling copper tube 15, and a spring 18 is sleeved on the driving rod 17. A limiting block 192 is fixedly provided at one end of the inner wall of the limiting groove 14, and one end of the driving rod 17 passes through the limiting block 192. One end of the spring 18 fits with one side of the limiting block 192. A spherical block 6 is fixedly provided at the end of the driving rod 17, and the spherical block 6 fits with the end of the driving ring 19; the spherical block 6 at the end of the driving rod 17 enters the bottom of the driving groove 191, and the driving rod 17 drives the cooling copper tube 15 to move along the limiting groove 14, so that the cooling copper tube 15 leaves the welding groove 11 position, which is convenient for welding;

[0030] The fixing ring 12 and the fixing column 13 are both provided with fixing components connected to the outer wall of the exhaust manifold, which are used to align the pipe openings of the two exhaust manifolds. The fixing components include three fixing plates 2 fixedly installed at one end of the fixing column 13, and the fixing plates 2 are threaded with a first screw rod 21, and the fixing ring 12 is threaded with three second screw rods 22. The lower ends of the first screw rod 21 and the second screw rod 22 are fixed with rubber pads 23, and the protective frame 1 is provided with three mounting grooves 3; the rubber pads 23 are used to protect the outer wall of the exhaust manifold, and the second screw rod 22 is rotated to move the second screw rod 22 inward along the fixing ring 12, so that the rubber pad 23 at the end of the second screw rod 22 fits with the outer wall of the exhaust manifold to position the two exhaust manifolds.

[0031] In the specific implementation process, Figure 1 and Figure 2As shown, a rotating groove 4 is opened at both ends of the protective frame 1, and a rotating block 41 is fixedly provided on one side of the fixed ring 12. The cross-section of the rotating block 41 is T-shaped, and the rotating block 41 fits against the inner wall of the rotating groove 4; the rotating block 41 is located in the rotating groove 4, which facilitates the fixed ring 12 to rotate along the protective frame 1.

[0032] In the specific implementation process, Figure 3 As shown, a fixing rod 5 is fixedly provided on the inner wall of the protective frame 1, a cylindrical retaining ring 51 is fixedly provided on the end of the fixing rod 5, a push rod 7 is fixedly provided on the outer wall of the protective frame 1, and a clamping block 71 is fixedly provided on the end of the push rod 7; the retaining ring 51 is used to block the cooling copper tube 15, the push rod 7 facilitates the welding personnel to rotate the protective frame 1, and the clamping block 71 facilitates the protective frame 1 to be hung on the pole when it is not in use.

[0033] Specifically, the preparation method of the present invention is as follows:

[0034] S1. Insert two exhaust manifolds from both ends of the protection frame 1, respectively, so that the exhaust manifold welding position is located at the welding groove 11, the outer wall of the exhaust manifold fits with the fixing column 13 and the inner wall of the cooling copper tube 15, and the inner wall of the driving ring 19 is larger than the exhaust manifold;

[0035] S2, rotate the second screw 22, and move the second screw 22 inward along the fixing ring 12, so that the rubber pad 23 at the end of the second screw 22 fits with the outer wall of the exhaust manifold, and fixes the positions of the two exhaust manifolds. Then, use a tool to pass through the mounting groove 3 to rotate the first screw 21, and the first screw 21 moves along the fixing plate 2, so that the rubber pad 23 at the end fits with the outer wall of the exhaust manifold, and fixes the fixing column 13 and the exhaust manifold.

[0036] S3, use a welding gun to pass through the welding groove 11 to weld the exhaust manifold connection. After the exhaust manifold at the position of the welding groove 11 is welded, rotate the protection frame 1 to transfer the welding groove 11, and weld other positions of the exhaust manifold. The rotation of the protection frame 1 will drive the drive ring 19 to rotate. The drive groove 191 on the drive ring 19 and the welding groove 11 are located in the same plane. When the drive groove 191 is parallel to the drive rod 17, the spring 18 rebounds and allows the spherical block 6 at the end of the drive rod 17 to enter the bottom of the drive groove 191. The drive rod 17 drives the cooling copper tube 15 Move along the limiting groove 14 to allow the cooling copper tube 15 to leave the welding groove 11 position to facilitate welding. When the driving ring 19 rotates again, the driving rod 17 in the driving groove 191 will move along the slope surface of the driving groove 191 to the end of the driving groove 191. The driving rod 17 drives the cooling copper tube 15 to move to the welding groove 11 position. The coolant 16 in the cooling copper tube 15 is used to quickly cool down the welded position to avoid thermal deformation. Finally, loosen the first screw 21 and the second screw 22, and pull the protective frame 1 out from the unwelded end of the exhaust manifold.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preventing thermal deformation of exhaust manifold half-shell welded pipe openings, comprising a protection frame (1), characterized in that: The protection frame (1) is provided with a welding groove (11), both ends of the protection frame (1) are rotatably provided with fixing rings (12), a cylindrical fixing column (13) is provided inside the protection frame (1), a plurality of limiting grooves (14) are provided in an annular manner on the inner wall of the fixing column (13), cooling copper tubes (15) are slidably provided in the limiting grooves (14), and cooling liquid (16) is provided in the cooling copper tubes (15), and a driving component for controlling the movement of the cooling copper tubes (15) is provided in the protection frame (1), so as to cool down the welding point during the welding process; The driving assembly comprises a driving ring (19) mounted on the inner wall of the protection frame (1), a driving groove (191) is provided on the driving ring (19), a driving rod (17) is fixedly provided at one end of the cooling copper tube (15), a spring (18) is sleeved on the driving rod (17), a limiting block (192) is fixedly provided at one end of the inner wall of the limiting groove (14), one end of the driving rod (17) passes through the limiting block (192), and one end of the spring (18) is in contact with one side of the limiting block (192); The fixing ring (12) and the fixing column (13) are both provided with a fixing assembly connected to the outer wall of the exhaust manifold, and are used for splicing and aligning the pipe openings of the two exhaust manifolds. The fixing assembly comprises three fixing plates (2) fixedly mounted on one end of the fixing column (13), the fixing plates (2) are each threadedly provided with a first screw rod (21), the fixing ring (12) is threadedly provided with three second screw rods (22), and the lower ends of the first screw rod (21) and the second screw rod (22) are each fixedly provided with a rubber pad (23); A fixing rod (5) is fixedly provided on the inner wall of the protection frame (1), and a cylindrical retaining ring (51) is fixedly provided on the end of the fixing rod (5). A spherical block (6) is fixedly provided on the end of each driving rod (17), and the spherical block (6) is fitted with the end of the driving ring (19). A push rod (7) is fixedly provided on the outer wall of the protection frame (1), and a clamping block (71) is fixedly provided on the end of the push rod (7).

2. A control device for preventing thermal deformation of exhaust manifold half-shell welding nozzles according to claim 1, characterized in that: The protection frame (1) is provided with three installation slots (3).

3. A control device for preventing thermal deformation of exhaust manifold half-shell welding nozzles according to claim 1, characterized in that: Both ends of the protection frame (1) are provided with rotation grooves (4), and one side of the fixing ring (12) is fixedly provided with a rotation block (41), the cross section of the rotation block (41) is T-shaped, and the rotation block (41) fits with the inner wall of the rotation groove (4).

4. A control method for preventing thermal deformation of exhaust manifold half-shell welded pipe openings is applied to the method for preventing thermal deformation of exhaust manifold half-shell welded pipe openings as claimed in any one of claims 1 to 3, the control method comprising the following steps: S1. Insert two exhaust manifolds from both ends of the protection frame (1) respectively, so that the exhaust manifold welding point is located at the welding groove (11), the outer wall of the exhaust manifold is in contact with the inner wall of the fixing column (13) and the cooling copper tube (15), and the inner wall of the driving ring (19) is larger than the exhaust manifold; S2, rotating the second screw rod (22) to move the second screw rod (22) inward along the fixing ring (12), allowing the rubber pad (23) at the end of the second screw rod (22) to fit the outer wall of the exhaust manifold, fixing the positions of the two exhaust manifolds, and rotating the first screw rod (21) through the mounting groove (3) with a tool, so that the first screw rod (21) moves along the fixing plate (2), allowing the rubber pad (23) at the end to fit the outer wall of the exhaust manifold, fixing the fixing column (13) and the exhaust manifold; S3. Use a welding gun to pass through the welding groove (11) to weld the exhaust manifold connection. After the exhaust manifold at the position of the welding groove (11) is welded, rotate the protection frame (1) to transfer the welding groove (11) and weld other positions of the exhaust manifold. The rotation of the protection frame (1) will drive the drive ring (19) to rotate. The drive groove (191) on the drive ring (19) and the welding groove (11) are located in the same plane. When the drive groove (191) is parallel to the drive rod (17), the rebound force of the spring (18) allows the spherical block (6) at the end of the drive rod (17) to enter the bottom of the drive groove (191). The drive rod (17) drives the cooling copper tube (15 ) moves along the limiting groove (14) to allow the cooling copper tube (15) to leave the welding groove (11) position, so as to facilitate welding. When the driving ring (19) rotates again, the driving rod (17) in the driving groove (191) moves along the slope surface of the driving groove (191) to the end of the driving groove (191). The driving rod (17) drives the cooling copper tube (15) to move to the welding groove (11) position. The cooling liquid (16) in the cooling copper tube (15) is used to quickly cool the position after welding to avoid thermal deformation. Finally, the first screw rod (21) and the second screw rod (22) are loosened to pull the protective frame (1) out from the unwelded end of the exhaust manifold.

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