Method for welding nut on outer plate assembly of automobile wheel cover reinforcing beam

Abstract

The application discloses a method for welding nuts on an automobile wheel cover reinforcing beam outer plate assembly, which comprises the following steps: S1, clamping and fixing of a first outer plate, a second outer plate and a fixing support of the automobile wheel cover reinforcing beam outer plate assembly is completed by a welding tool; S2, a first nut and a second nut are installed on the first outer plate; S3, the first outer plate, the second outer plate and the fixing support are welded; and S4, the nuts and the first outer plate are welded. The method for welding nuts on the automobile wheel cover reinforcing beam outer plate assembly adopts a special welding tool, and through cooperation of a plurality of clamping devices and positioning pins, each component of the automobile wheel cover reinforcing beam outer plate assembly and the nuts are clamped together, and the nuts are positioned and fixed, so that the positioning of each component is accurate, the clamping efficiency is improved, and the product quality of the automobile wheel cover reinforcing beam outer plate assembly after welding and the welding nut operation efficiency of the nuts are improved.

Description

Technical Field

[0001] This invention belongs to the field of welding fixture technology. Specifically, this invention relates to a method for welding nuts onto the outer plate assembly of an automotive wheel arch reinforcement beam. Background Technology

[0002] The outer plate assembly of the wheel arch reinforcement beam is an assembly on a car. Its main function is to improve the stiffness and modal characteristics at the wheel arch location and to transfer part of the collision energy.

[0003] The outer panel assembly of the automotive wheel arch reinforcement beam consists of a first outer panel, a second outer panel, and a fixing bracket, all of which are sheet metal parts. The second outer panel and the fixing bracket are welded to the first outer panel. During welding, welding fixtures are used to clamp the various components that make up the automotive wheel arch reinforcement beam outer panel assembly. Furthermore, the automotive wheel arch reinforcement beam outer panel assembly requires pre-welding of nuts to the assembly.

[0004] Existing technologies lack the tooling and fixtures that can accurately position the various components that make up the outer panel of the automotive wheel arch reinforcement beam during welding and enable the welding of nuts, which affects the quality of the welded products and also reduces production efficiency. Summary of the Invention

[0005] This invention provides a method for welding nuts onto the outer panel assembly of an automotive wheel arch reinforcement beam, with the aim of improving the efficiency of the welding operation on the nuts onto the outer panel assembly of the automotive wheel arch reinforcement beam.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for welding nuts onto the outer plate assembly of an automotive wheel arch reinforcement beam, comprising the following steps:

[0007] S1. The first outer plate, the second outer plate, and the fixing bracket of the automobile wheel arch reinforcement beam outer plate assembly are assembled by welding fixtures;

[0008] S2. Install the first nut and the second nut onto the first outer plate;

[0009] S3. Weld the first outer plate, the second outer plate, and the fixed bracket;

[0010] S4. Weld the nut to the first outer plate;

[0011] The welding fixture includes a first clamping device for clamping the first outer plate and the fixed bracket at one end of the first outer plate, a second clamping device for clamping the first outer plate and one end of the second outer plate at the other end of the first outer plate, a third clamping device for clamping the second outer plate at the other end of the second outer plate, a nut clamping device for fixing the first nut to the first outer plate, and a nut positioning device for fixing the second nut to the first outer plate.

[0012] The first clamping device includes a first clamping bracket, a first main clamping arm, a side clamping arm disposed on the first main clamping arm, a first driver disposed on the first clamping bracket and used to control the rotation of the first main clamping arm, a first upper clamping block and a second upper clamping block disposed on the first main clamping arm, a first lower clamping block disposed on the first clamping bracket and cooperating with the first upper clamping block to clamp the first outer plate, a second lower clamping block cooperating with the second upper clamping block to clamp the fixed bracket, a third upper clamping block disposed on the side clamping arm, and a third lower clamping block cooperating with the third upper clamping block to clamp the first outer plate.

[0013] The first clamping device further includes a first auxiliary bracket and a first lifting mechanism disposed on the first auxiliary bracket. The first lifting mechanism includes a first lifting cylinder disposed on the first auxiliary bracket and a first lifting seat disposed on the first lifting cylinder. The second lower clamping block is disposed on the first lifting seat.

[0014] The welding fixture also includes a second auxiliary support and a limiting block disposed on the second auxiliary support for limiting the first outer plate, and the nut tightening device is disposed on the second auxiliary support.

[0015] The nut clamping device includes a first support plate disposed on the second auxiliary bracket, a top block disposed on the first support plate and used to contact the bottom surface of the first outer plate, a rotatable nut clamping arm disposed on the first support plate, an actuator disposed on the first support plate and used to control the rotation of the nut clamping arm, a first mounting plate disposed on the nut clamping arm, and a clamping rod disposed on the first mounting plate and used to apply pressure to the first nut.

[0016] The second clamping device includes a second clamping bracket, a second clamping arm, a second driver disposed on the second clamping bracket and used to control the rotation of the second clamping arm, a fourth upper clamping block disposed on the second clamping arm, and a fourth lower clamping block disposed on the second clamping bracket and cooperating with the fourth upper clamping block to clamp the first outer plate and the second outer plate.

[0017] The second clamping device further includes a second lifting mechanism disposed on the second clamping bracket. The second lifting mechanism includes a second lifting cylinder and a second lifting seat disposed on the second lifting cylinder. A second positioning pin and a third positioning pin are disposed on the second lifting seat.

[0018] The nut positioning device includes a second support plate disposed on the second clamping bracket, a second mounting plate disposed on the second support plate, and a nut positioning pin movably disposed on the second mounting plate for positioning the second nut.

[0019] The third clamping device includes a third clamping bracket, a third clamping arm, a third driver disposed on the third clamping bracket and used to control the rotation of the third clamping arm, a fifth upper clamping block disposed on the third clamping arm, and a fifth lower clamping block disposed on the third clamping bracket and cooperating with the fifth upper clamping block to clamp the first outer plate. A fourth positioning pin is disposed on the third clamping bracket.

[0020] Multiple fifth upper clamping blocks and multiple fifth lower clamping blocks are provided.

[0021] The method for welding nuts to the outer panel assembly of the automotive wheel arch reinforcement beam of the present invention uses a special welding fixture. Through the cooperation of multiple clamping devices and positioning pins, the various components of the outer panel assembly of the automotive wheel arch reinforcement beam are clamped together, as well as the nuts are positioned and fixed. This ensures that the positioning of each component is accurate, improves the clamping efficiency, and can improve the product quality of the welded outer panel assembly of the automotive wheel arch reinforcement beam and the efficiency of the nut welding operation. Attached Figure Description

[0022] This manual includes the following figures, which illustrate the following:

[0023] Figure 1 This is a structural schematic diagram of the welding fixture;

[0024] Figure 2 and Figure 3 This is a schematic diagram showing the usage status of welding fixtures;

[0025] Figure 4 This is a structural schematic diagram of the outer panel assembly of the automotive wheel arch reinforcement beam;

[0026] Figure 5 This is a schematic diagram of the first clamping device;

[0027] Figure 6 This is a schematic diagram of the nut tightening device;

[0028] Figure 7 and Figure 8 This is a schematic diagram of the second clamping device;

[0029] Figure 9 This is a schematic diagram of the third clamping device;

[0030] The following are labeled in the diagram: 1. First clamping bracket; 2. First main clamping arm; 3. Side clamping arm; 4. First driver; 5. First upper clamping block; 6. First lower clamping block; 7. Second upper clamping block; 8. Second lower clamping block; 9. Third upper clamping block; 10. Third lower clamping block; 11. First positioning pin; 12. First auxiliary bracket; 13. Second auxiliary bracket; 14. Limiting block; 15. First lifting cylinder; 16. First lifting seat; 17. Second clamping arm; 18. Second driver; 19. Fourth upper clamping block; 20. Fourth lower clamping block; 21. Second clamping bracket; 22. Second lifting cylinder; 23. Second lifting arm; 24. Lowering seat; 25. Second positioning pin; 26. Third positioning pin; 27. Third clamping arm; 28. Third actuator; 29. ​​Fifth upper clamping block; 30. Fifth lower clamping block; 31. Third clamping bracket; 32. Fourth positioning pin; 33. Fifth positioning pin; 34. First outer plate; 35. Second outer plate; 36. Fixed bracket; 37. Base; 38. First nut; 39. Second nut; 40. First support plate; 41. Top block; 42. Nut clamping arm; 43. Actuating element; 44. First mounting plate; 45. Pressure rod; 46. Second support plate; 47. Nut positioning pin. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0032] like Figures 1 to 9 As shown, the present invention provides a method for welding nuts to an outer plate assembly of a car wheel arch reinforcement beam, comprising the following steps:

[0033] S1. The first outer plate, the second outer plate, and the fixing bracket of the automobile wheel arch reinforcement beam outer plate assembly are assembled by welding fixtures;

[0034] S2. Install the first nut 37 and the second nut 38 onto the first outer plate;

[0035] S3. Weld the first outer plate, the second outer plate, and the fixed bracket;

[0036] S4. Weld the nut to the first outer plate.

[0037] Specifically, such as Figures 1 to 9As shown, the welding fixture includes a base 36, a first clamping device for clamping the first outer plate 33 and the fixing bracket 35 at one end of the first outer plate 33, a second clamping device for clamping the first outer plate 33 and one end of the second outer plate 34 at the other end of the first outer plate 33, a third clamping device for clamping the second outer plate 34 at the other end of the second outer plate 34, a nut clamping device for fixing the first nut 37 to the first outer plate 33, and a nut positioning device for fixing the second nut 38 to the first outer plate 33. The first clamping device is provided with a first positioning pin 11 for positioning the first outer plate 33, the second clamping device is provided with a second positioning pin 24 for positioning the first outer plate 33 and a third positioning pin 25 for positioning the second outer plate 34, and the third clamping device is provided with a fourth positioning pin 31 for positioning the second outer plate 34. The first clamping device, the second clamping device, and the third clamping device are mounted on the base 36.

[0038] like Figures 2 to 4 As shown, the outer panel assembly of the automotive wheel arch reinforcement beam consists of a first outer panel 33, a second outer panel 34, and a fixing bracket 35. All three are sheet metal parts. The second outer panel 34 and the fixing bracket 35 are welded to the first outer panel 33. The fixing bracket 35 is located on the outside of the first outer panel 33. One end of the first outer panel 33 is connected to one end of the second outer panel 34 along its length. The first outer panel 33 has an L-shaped cross-section, and the second outer panel 34 has a U-shaped cross-section. Multiple first nuts 37 are welded to the first surface of the first outer panel 33, and multiple second nuts 38 are welded to the second surface of the first outer panel 33. The first and second surfaces of the first outer panel 33 are perpendicular to each other.

[0039] like Figure 1 and Figure 2 As shown, the base 36 is horizontally positioned and has a certain width and length. The length direction of the base 36 is parallel to the first direction, and the width direction of the base 36 is parallel to the second direction. Both the first and second directions are horizontal and perpendicular to each other. The first clamping device, the second clamping device, and the third clamping device are on the same straight line parallel to the first direction. The second clamping device is located between the first clamping device and the third clamping device. The nut positioning device is located on the second clamping device, and the nut tightening device is located between the first clamping device and the second clamping device.

[0040] like Figures 1 to 5As shown, the first clamping device includes a first clamping bracket 1, a first main clamping arm 2, a side clamping arm 3 disposed on the first main clamping arm 2, a first driver 4 disposed on the first clamping bracket 1 and used to control the rotation of the first main clamping arm 2, a first upper clamping block 5 and a second upper clamping block 7 disposed on the first main clamping arm 2, a first lower clamping block 6 disposed on the first clamping bracket 1 and cooperating with the first upper clamping block 5 to clamp the first outer plate 33, a second lower clamping block 8 cooperating with the second upper clamping block 7 to clamp the fixed bracket 35, a third upper clamping block 9 disposed on the side clamping arm 3, and a third lower clamping block 10 cooperating with the third upper clamping block 9 to clamp the first outer plate 33. The rotation center line of the first main clamping arm 2 is a horizontal line. The first clamping bracket 1 is vertically disposed on the base 36, and the lower end of the first clamping bracket 1 is fixedly connected to the base 36. The first actuator 4 is vertically mounted on the first clamping bracket 1. The first actuator 4 is used to control the up-and-down rotation of the first main clamping arm 2. The first actuator 4 is a cylinder. The first upper clamping block 5 is fixedly mounted on the first main clamping arm 2 and is used to contact the first outer plate 33. The side clamping arm 3 is fixedly connected to the first main clamping arm 2 and extends outward from the first main clamping arm 2. The third upper clamping block 9 is fixedly mounted on the side clamping arm 3 and is used to contact the first outer plate 33. The first lower clamping block 6 and the third lower clamping block 10 are fixedly mounted on the first clamping bracket 1 and are used to contact the first outer plate 33. The height of the first lower clamping block 6 is greater than the height of the third lower clamping block 10.

[0041] In step S1 above, when clamped, the first upper clamping block 5 and the third upper clamping block 9 are located above the first outer plate 33 and are used to apply downward pressure to the first outer plate 33. The first lower clamping block 6 and the third upper and lower clamping blocks are located below the first outer plate 33 and the first lower clamping block 6 is in contact with the bottom surface of the first outer plate 33. Thus, the first upper clamping block 5 and the first lower clamping block 6 cooperate, and the third upper clamping block 9 and the third lower clamping block 10 cooperate to clamp one end of the first outer plate 33 in the length direction.

[0042] like Figure 1 , Figure 2 and Figure 4As shown, the first clamping device further includes a first auxiliary bracket 12 vertically disposed on the top surface of the base 36 and a first lifting mechanism disposed on the first auxiliary bracket 12. A second lower clamping block 8 is disposed on the first lifting mechanism. The first lifting mechanism includes a first lifting cylinder 15 fixedly disposed on the first auxiliary bracket 12 and a first lifting seat 16 disposed on the first lifting cylinder 15. The second lower clamping block 8 is disposed on the first lifting seat 16. A second upper clamping block 7 is fixedly disposed at one end of the first main clamping arm 2 along its length. The first upper clamping block 5 is located between the two ends of the first main clamping arm 2 along its length, and the second upper clamping block 7 is used to contact the fixed bracket 35. The second lower clamping block 8 is fixedly disposed on the first lifting seat 16, and the second lower clamping block 8 is used to contact the fixed bracket 35. In step S1 above, in the clamping state, the second upper clamping block 7 is located above the fixed bracket 35 and applies downward pressure to the fixed bracket 35. The second lower clamping block 8 is located below the fixed bracket 35 and contacts the bottom surface of the fixed bracket 35. Thus, the second upper clamping block 7 and the second lower clamping block 8 cooperate to clamp the fixed bracket 35. Multiple second upper clamping blocks 7 and multiple second lower clamping blocks 8 are provided. The first lifting seat 16 is fixedly connected to the piston rod of the first lifting cylinder 15. By extending and retracting the first lifting cylinder 15, the first lifting seat 16 and the second lower clamping block 8 on it are controlled to move in the vertical direction, realizing the contact and separation of the second lower clamping block 8 with the fixed bracket 35.

[0043] like Figures 1 to 5 As shown, the first positioning pin 11 is vertically mounted on the first clamping bracket 1, and the first outer plate 33 has a through hole for inserting the first positioning pin 11. Each second lower clamping block 8 is provided with a fifth positioning pin 32 for positioning the fixed bracket 35. The fifth positioning pin 32 is vertically mounted, and the fixed bracket 35 has a through hole for inserting the fifth positioning pin 32, ensuring the accurate positioning of the fixed bracket 35. By extending and retracting the first lifting cylinder 15, the first lifting seat 16 and its second lower clamping blocks 8 and fifth positioning pins 32 are controlled to move vertically, realizing the contact and separation of the second lower clamping blocks 8 with the fixed bracket 35 while simultaneously moving the fifth positioning pin 32, allowing the fifth positioning pin 32 to be inserted into and removed from the through hole on the fixed bracket 35. In step S1 above, the extension of the first lifting cylinder 15 pushes the first lifting seat 16 and its second lower clamping block 8 and fifth positioning pin 32 to move upward in the vertical direction, so that the second lower clamping block 8 contacts the fixed bracket 35 at the same time, the fifth positioning pin 32 is inserted into the through hole on the fixed bracket 35.

[0044] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, two second upper clamping blocks 7 and two second lower clamping blocks 8 are provided, and two fifth positioning pins 32 are also provided.

[0045] like Figure 1 and Figure 2 As shown, the welding fixture also includes a second auxiliary support 13 vertically mounted on the top surface of the base 36 and a limiting block 14 mounted on the second auxiliary support 13 for limiting the position of the first outer plate 33. The second auxiliary support 13 and the first clamping support 1 are on the same straight line parallel to the first direction, and the limiting block 14 is fixedly mounted on the upper end of the second auxiliary support 13. In step S1 above, the limiting block 14 contacts the outer wall surface of the first outer plate 33 and is used to limit the position of the first outer plate 33 in the second direction to ensure the accurate position of the first outer plate 33. The limiting block 14 and the fixing bracket 35 are located on the same side of the first outer plate 33.

[0046] like Figures 1 to 6 As shown, the second clamping device includes a second clamping bracket 21, a second clamping arm 17, a second driver 18 mounted on the second clamping bracket 21 for controlling the rotation of the second clamping arm 17, a fourth upper clamping block 19 mounted on the second clamping arm 17, and a fourth lower clamping block 20 mounted on the second clamping bracket 21 and cooperating with the fourth upper clamping block 19 to clamp the first outer plate 33 and the second outer plate 34. The rotation center line of the second clamping arm 17 is parallel to the first direction. The second clamping bracket 21 is vertically mounted on the base 36, and the lower end of the second clamping bracket 21 is fixedly connected to the base 36. The second driver 18 is vertically mounted on the second clamping bracket 21 and is used to control the up and down rotation of the second clamping arm 17. The second driver 18 is a cylinder. The fourth upper clamping block 19 is fixedly mounted on the second clamping arm 17 and is used to contact the first outer plate 33. The fourth lower clamping block 20 is fixedly mounted on the second clamping bracket 21 and is used to contact the second outer plate 34. In step S1 above, in the clamping state, the fourth upper clamping block 19 is located above the first outer plate 33 and is used to apply downward pressure to the first outer plate 33. The fourth lower clamping block 20 is located below the second outer plate 34 and is in contact with the bottom surface of the second outer plate 34. Thus, the fourth upper clamping block 19 and the fourth lower clamping block 20 cooperate to clamp the other end of the first outer plate 33 and the second outer plate 34 in the length direction, keeping the first outer plate 33 and the second outer plate 34 in a close fit. The end of the first outer plate 33 in the length direction is inserted into the second outer plate 34. Multiple fourth upper clamping blocks 19 are provided, and each fourth upper clamping block 19 cooperates with one fourth lower clamping block 20.

[0047] like Figures 1 to 3 , Figure 7 and Figure 8As shown, the second clamping device also includes a second lifting mechanism mounted on the second clamping bracket 21. The second lifting mechanism includes a second lifting cylinder 22 and a second lifting seat 23 mounted on the second lifting cylinder 22. A second positioning pin 24 and a third positioning pin 25 are mounted on the second lifting mechanism and the second lifting seat 23. The end of the first outer plate 33 has a through hole for inserting the second positioning pin 24, and the end of the second outer plate 34 has a through hole for inserting the third positioning pin 25. The second positioning pin 24 and the third positioning pin 25 are vertically mounted on the upper end of the second lifting seat 23. The second lifting cylinder 22 is fixedly mounted on the second clamping bracket 21. By extending and retracting the second lifting cylinder 22, the second lifting seat 23 and the second positioning pin 24 and the third positioning pin 25 on it are controlled to move vertically, so that the second positioning pin 24 and the third positioning pin 25 can be inserted into and removed from the through holes on the first outer plate 33 and the second outer plate 34, respectively. In step S1 above, when the second lifting cylinder 22 extends, it controls the second lifting seat 23 and its second positioning pin 24 and third positioning pin 25 to move upward in the vertical direction, so that the second positioning pin 24 and the third positioning pin 25 can be inserted into the through holes on the first outer plate 33 and the second outer plate 34 respectively to achieve positioning.

[0048] like Figures 1 to 3 and Figure 9As shown, the third clamping device includes a third clamping bracket 30, a third clamping arm 26, a third driver 27 mounted on the third clamping bracket 30 for controlling the rotation of the third clamping arm 26, a fifth upper clamping block 28 mounted on the third clamping arm 26, and a fifth lower clamping block 29 mounted on the third clamping bracket 30 and cooperating with the fifth upper clamping block 28 to clamp the first outer plate 33. A fourth positioning pin 31 is mounted on the third clamping bracket 30. The rotation center line of the third clamping arm 26 is parallel to the second direction. The third clamping bracket 30 is vertically mounted on the base 36, and its lower end is fixedly connected to the base 36. The third driver 27 is vertically mounted on the third clamping bracket 30 and is used to control the up-and-down rotation of the third clamping arm 26. The third driver 27 is a cylinder. The fifth upper clamping block 28 is fixedly mounted on the third clamping arm 26 and is used to contact the second outer plate 34. The fifth lower clamping block 29 is fixedly mounted on the third clamping bracket 30 and is used to contact the second outer plate 34. In step S1 above, in the clamping state, the fifth upper clamping block 28 is located above the second outer plate 34 and is used to apply downward pressure to the second outer plate 34, while the fifth lower clamping block 29 is located below the second outer plate 34 and is in contact with the bottom surface of the second outer plate 34. Thus, the fifth upper clamping block 28 and the fifth lower clamping block 29 cooperate to clamp the other end of the second outer plate 34 in the length direction. Multiple fifth upper clamping blocks 28 are provided, and each fifth upper clamping block 28 cooperates with one fifth lower clamping block 29. The fourth positioning pin 31 is vertically mounted on the third clamping bracket 30, and the second outer plate 34 is provided with a through hole for the fourth positioning pin 31 to be inserted. The fourth positioning pin 31 is inserted into the through hole on the second outer plate 34 to achieve the positioning of the second outer plate 34.

[0049] like Figures 1 to 4 , Figure 6As shown, the nut tightening device includes a first support plate 39 mounted on a second auxiliary bracket, a top block 40 mounted on the first support plate 39 and for contacting the bottom surface of the first outer plate, a rotatable nut clamping arm 41 mounted on the first support plate 39, an actuator 42 mounted on the first support plate 39 for controlling the rotation of the nut clamping arm 41, a first mounting plate 43 mounted on the nut clamping arm 41, and a clamping rod 44 mounted on the first mounting plate 43 for applying pressure to the first nut 37. The first support plate 39 is fixedly mounted on the upper end of the second auxiliary bracket. The rotation center line of the nut clamping arm 41 is parallel to the first direction. The actuator 42, which is a cylinder, controls the up-and-down rotation of the nut clamping arm 41. The top block 40 is fixedly mounted on the upper end of the first support plate 39 and contacts the bottom surface of the first outer plate, providing support for the first outer plate at the position between its two ends and reducing deformation of the first outer plate. The first mounting plate 43 is fixedly disposed on the upper end of the nut clamping arm 41, and the lower end of the nut clamping arm 41 is connected to the actuator 42. The clamping rod 44 is fixedly disposed on the end of the first mounting plate 43 and is used to contact the first nut 37. In step S2 above, all the first nuts 37 are placed on the first surface of the first outer plate 33, and then the actuator 42 controls the nut clamping arm 41 to rotate. The nut clamping arm 41 drives the first mounting plate 43 and the clamping rod 44 on it to rotate downward synchronously, so that the clamping rod 44 contacts the first nut 37 below and applies pressure to the first nut 37, so that the first nut 37 is fixed on the first surface of the first outer plate 33. The first mounting plate 43 is located above the first surface of the first outer plate 33. The first surface of the first outer plate 33 is a horizontal plane. The nut clamping arm 41 is located on the outside of the first outer plate 33, and the nut clamping arm 41 and the limiting block are respectively located on opposite sides of the first outer plate 33.

[0050] like Figures 1 to 4 , Figure 6 As shown, in this embodiment, three first nuts 37 are installed. Correspondingly, multiple first mounting plates 43 and clamping rods 44 are provided, with one clamping rod 44 installed on each first mounting plate 43.

[0051] like Figures 1 to 4 , Figure 7 and Figure 8As shown, the nut positioning device includes a second support plate 45 mounted on a second clamping bracket, a second mounting plate 46 mounted on the second support plate 45, and a nut positioning pin 47 movably mounted on the second mounting plate 46 for positioning the second nut 38. Multiple nut positioning pins 47 are provided, each used to position and fix one second nut 38. The second support plate 45 is fixedly mounted on the second clamping bracket, located between the second clamping bracket and the second auxiliary bracket. The second mounting plate 46 is fixedly mounted at one end of the second support plate 45. The nut positioning pin 47 is movably mounted on the second support plate 45. A through hole is provided on the first outer plate for the nut positioning pin 47 to pass through. After passing through the through hole in the first outer plate, the nut positioning pin 47 is inserted into the center hole of the second nut 38, keeping the second nut 38 in contact with the second surface of the first outer plate, thus fixing the second nut 38.

[0052] In step S2 above, the operator moves the nut positioning pin 47 by pushing it, causing it to pass through the through hole in the first outer plate and insert into the center hole of the second nut 38. The second nut 38 is then fixed in the nut positioning pin 47, while simultaneously maintaining contact with the second surface of the first outer plate. After welding is completed, the nut positioning pin 47 can be removed. This nut positioning device has a simple structure, is easy to operate, and is highly efficient.

[0053] In this embodiment, two second nuts 38 are installed, and correspondingly, two second mounting plates 46 are provided, with a nut positioning pin 47 installed on each second mounting plate 46.

[0054] In step S3 above, the first outer plate, the second outer plate, and the fixed bracket are welded together respectively.

[0055] In step S4 above, all the first nuts 37 and the second nuts 38 are welded to the first outer plate.

[0056] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for welding nuts onto the outer plate assembly of an automotive wheel arch reinforcement beam, characterized in that, Including the following steps: S1. The first outer plate, the second outer plate, and the fixing bracket of the automobile wheel arch reinforcement beam outer plate assembly are assembled by welding fixtures; S2. Install the first nut and the second nut onto the first outer plate; S3. Weld the first outer plate, the second outer plate, and the fixed bracket; S4. Weld the nut to the first outer plate; The welding fixture includes a first clamping device for clamping the first outer plate and the fixed bracket at one end of the first outer plate, a second clamping device for clamping the first outer plate and one end of the second outer plate at the other end of the first outer plate, a third clamping device for clamping the second outer plate at the other end of the second outer plate, a nut clamping device for fixing the first nut to the first outer plate, and a nut positioning device for fixing the second nut to the first outer plate. The welding fixture also includes a second auxiliary support and a limiting block disposed on the second auxiliary support for limiting the first outer plate; the nut tightening device is disposed on the second auxiliary support. The nut clamping device includes a first support plate disposed on the second auxiliary bracket, a top block disposed on the first support plate and used to contact the bottom surface of the first outer plate, a rotatable nut clamping arm disposed on the first support plate, an actuating element disposed on the first support plate and used to control the rotation of the nut clamping arm, a first mounting plate disposed on the nut clamping arm, and a clamping rod disposed on the first mounting plate and used to apply pressure to the first nut. In step S2, all the first nuts are placed on the first surface of the first outer plate. Then, the actuator controls the nut clamping arm to rotate. The nut clamping arm drives the first mounting plate and its clamping rod to rotate downward synchronously, so that the clamping rod contacts the first nut below and applies pressure to the first nut, so that the first nut is fixed on the first surface of the first outer plate. The first mounting plate is located above the first surface of the first outer plate. The first surface of the first outer plate is a horizontal plane. The nut clamping arm is located on the outside of the first outer plate, and the nut clamping arm and the limiting block are located on opposite sides of the first outer plate. The second clamping device includes a second clamping bracket, and the nut positioning device includes a second support plate disposed on the second clamping bracket, a second mounting plate disposed on the second support plate, and a nut positioning pin movably disposed on the second mounting plate for positioning the second nut. In step S2, the operator moves the nut positioning pin by pushing it, so that the nut positioning pin passes through the through hole on the first outer plate and is inserted into the center hole of the second nut. The second nut is fixed in the nut positioning pin, and at the same time, the second nut is in contact with the second surface of the first outer plate. After welding is completed, the nut positioning pin can be removed.

2. The method for welding nuts to the outer plate assembly of the automotive wheel arch reinforcement beam according to claim 1, characterized in that, The first clamping device includes a first clamping bracket, a first main clamping arm, a side clamping arm disposed on the first main clamping arm, a first driver disposed on the first clamping bracket and used to control the rotation of the first main clamping arm, a first upper clamping block and a second upper clamping block disposed on the first main clamping arm, a first lower clamping block disposed on the first clamping bracket and cooperating with the first upper clamping block to clamp the first outer plate, a second lower clamping block cooperating with the second upper clamping block to clamp the fixed bracket, a third upper clamping block disposed on the side clamping arm, and a third lower clamping block cooperating with the third upper clamping block to clamp the first outer plate.

3. The method for welding nuts to the outer plate assembly of the automotive wheel arch reinforcement beam according to claim 2, characterized in that, The first clamping device further includes a first auxiliary bracket and a first lifting mechanism disposed on the first auxiliary bracket. The first lifting mechanism includes a first lifting cylinder disposed on the first auxiliary bracket and a first lifting seat disposed on the first lifting cylinder. The second lower clamping block is disposed on the first lifting seat.

4. The method for welding nuts onto the outer plate assembly of the automotive wheel arch reinforcement beam according to any one of claims 1 to 3, characterized in that, The second clamping device further includes a second clamping arm, a second driver disposed on the second clamping bracket and used to control the rotation of the second clamping arm, a fourth upper clamping block disposed on the second clamping arm, and a fourth lower clamping block disposed on the second clamping bracket and cooperating with the fourth upper clamping block to clamp the first outer plate and the second outer plate.

5. The method for welding nuts to the outer plate assembly of the automotive wheel arch reinforcement beam according to claim 4, characterized in that, The second clamping device further includes a second lifting mechanism disposed on the second clamping bracket. The second lifting mechanism includes a second lifting cylinder and a second lifting seat disposed on the second lifting cylinder. A second positioning pin and a third positioning pin are disposed on the second lifting seat.

6. The method for welding nuts onto the outer plate assembly of the automotive wheel arch reinforcement beam according to any one of claims 1 to 3, characterized in that, The third clamping device includes a third clamping bracket, a third clamping arm, a third driver disposed on the third clamping bracket and used to control the rotation of the third clamping arm, a fifth upper clamping block disposed on the third clamping arm, and a fifth lower clamping block disposed on the third clamping bracket and cooperating with the fifth upper clamping block to clamp the first outer plate. A fourth positioning pin is disposed on the third clamping bracket.

7. The method for welding nuts to the outer plate assembly of the automotive wheel arch reinforcement beam according to claim 6, characterized in that, Multiple fifth upper clamping blocks and multiple fifth lower clamping blocks are provided.

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