A leaf spring forming apparatus and a method of processing the same

Abstract

The application discloses a steel plate spring forming equipment and a processing method thereof and belongs to the technical field of steel plate spring processing. The equipment comprises a rack, a moving assembly, a clamping arm and a driving assembly. The clamping arm comprises a swing arm frame, and the output end of the driving assembly is connected with the swing arm frame. The rotating assembly comprises a motor, a transmission shaft installed at the output end of the motor is rotationally connected with the output end of the moving assembly, one end of the transmission shaft is slidably installed with a rotating frame, and a sleeve is sleeved on the transmission shaft. Two sets of centering assemblies are installed on the rotating frame. The output end of the moving assembly is installed with a sixth hydraulic cylinder, and the end of the mandrel is inserted into the output end of the sixth hydraulic cylinder. The centering assembly and the uniform outer diameter shaft sleeve are designed, different inner diameter shaft sleeves are quickly clamped, the mandrel replacement process is simplified, the fifth hydraulic cylinder pushes the rotating frame, the shaft sleeve is inserted into the supporting hole to complete positioning, the clamping arm does not need to be disassembled or the supporting hole size needs to be adjusted, the type replacement time is greatly shortened, and the adaptability of the equipment to different specifications of the lugs is improved.

Description

Technical Field

[0001] This invention relates to the field of leaf spring processing technology, and more specifically, to a leaf spring forming equipment and processing method thereof. Background Technology

[0002] As a core load-bearing component of automotive suspension systems, the forming precision of the leaf spring's end lug structure has a decisive impact on the assembly stability of the suspension system and the service life of the entire vehicle. In the lug forming process, based on the different forming methods, the relevant equipment is mainly divided into two categories: forming with a mandrel and forming without a mandrel. Among them, the forming technology with a mandrel uses a mandrel to rigidly constrain the inner diameter of the lug, and the bending trajectory of the steel plate during the forming process can be precisely controlled by the mandrel profile. Therefore, its lug dimensional accuracy, roundness, and surface quality are significantly better than those of forming without a mandrel. In application scenarios with stringent requirements for lug dimensional tolerances and assembly interchangeability, forming equipment with a mandrel has become the mainstream choice to ensure product quality.

[0003] In existing mandrel forming equipment, the mandrel and the output end of the hydraulic cylinder are rigidly connected by bolts, and the size of the support hole corresponds one-to-one with the diameter of the mandrel. When processing ear rolls with different inner diameters, it is necessary to disassemble the fixed connection between the mandrel and the hydraulic cylinder, and simultaneously adjust the position of the support hole of the clamping arm or replace the clamping arm. The operation steps are complicated, and the changeover time is as long as 30 minutes or more, which seriously affects production efficiency. Moreover, during the ear roll forming process, the mandrel must withstand the heat conduction of the high-temperature steel plate (about 800-1000℃), and the surface temperature can reach more than 300℃. When changing the mandrel, the operator must directly contact the high-temperature mandrel, which can easily cause burns. Although some equipment uses simple lifting tools, manual alignment is still required, resulting in low operational safety. Furthermore, the cooling time of the high-temperature mandrel is long, which affects the continuous operation efficiency of the equipment. In view of this, we propose a steel leaf spring forming equipment and its processing method. Summary of the Invention

[0004] The purpose of this invention is to provide a steel leaf spring forming equipment and its processing method to solve at least one of the above-mentioned technical problems.

[0005] This invention provides a steel leaf spring forming equipment, including a frame, on which two sets of moving components are mounted, and a clamping arm and a driving component are mounted at the output end of the moving components;

[0006] The clamping arm includes a swing arm frame, the output end of the drive component is connected to the swing arm frame, and drives the swing arm frame to rotate on the output end of the moving component;

[0007] The rotating assembly includes a motor, a drive shaft mounted on the output end of the motor is rotatably connected to the output end of the moving assembly, a rotating frame is slidably mounted on one end of the drive shaft, a sleeve mounted on the rotating frame is fitted onto the drive shaft, and a connecting block rotatably mounted on the sleeve is fixedly connected to the output end of the fifth hydraulic cylinder.

[0008] The rotating frame is equipped with two sets of centering components for clamping and centering the bushing;

[0009] The output end of the moving component is equipped with a sixth hydraulic cylinder, and the end of the spindle that is adapted to the bushing is inserted into the output end of the sixth hydraulic cylinder.

[0010] Driven by the output ends of the fifth and sixth hydraulic cylinders, the bushing and spindle are inserted into or disengaged from the swing arm.

[0011] As a further description of the above technical solution, the only difference between the mandrels is their outer diameter, and the only difference between the bushings is their inner diameter.

[0012] As a further description of the above technical solution, a positioning rod is fixedly installed at one end of the mandrel, and a limit plate is fixedly installed at the other end;

[0013] The output end of the sixth hydraulic cylinder is equipped with a connecting frame, and the limiting plate is inserted into the connecting frame.

[0014] As a further description of the above technical solution, the swing arm is provided with positioning holes and support holes, the axes of the positioning holes and support holes are collinear with the rotation axis of the swing arm, the bushing cooperates with the support hole, and the positioning rod cooperates with the positioning hole;

[0015] A third hydraulic cylinder is fixedly installed on the swing arm, and a top block is fixedly installed on the output end of the third hydraulic cylinder.

[0016] As a further description of the above technical solution, the moving component includes a second hydraulic cylinder fixedly installed on the frame, a sliding frame fixedly installed at the output end of the second hydraulic cylinder, the sliding frame being slidably connected to the frame, two sets of arc plates fixedly installed on the sliding frame, the arc plates being coaxial with the transmission shaft, limit grooves being provided on the arc plates, and arc blocks fixedly installed on the sliding frame.

[0017] The connecting frame is provided with a positioning groove.

[0018] As a further description of the above technical solution, the bottom and top of the two sets of arc plates have a set spacing, and the top spacing is smaller than the outer diameter of the limiting plate, while the bottom spacing is larger than the outer diameter of the limiting plate.

[0019] As a further description of the above technical solution, the centering component includes a support plate rotatably connected to the rotating frame and several top plates slidably connected to the rotating frame. Several arc-shaped grooves are provided on the support plate, and limit rods are fixedly installed on the top plate. The limit rods slide in the arc-shaped grooves.

[0020] The bushing has a groove, the length of which is equal to the length of the top plate. The top plate is inserted into the groove to clamp and fix the bushing.

[0021] As a further description of the above technical solution, the centering component also includes a threaded rod rotatably connected to the rotating frame. A guide groove is provided on the support plate, and an adjusting block is threadedly fitted on the threaded rod. A lever is fixedly installed on the adjusting block. The lever slides in the guide groove and passes through the guide groove to slide in connection with the rotating frame. By rotating the threaded rod, the support plate can be driven to rotate. When the support plate rotates, the limiting rod slides in the arc-shaped groove, thereby driving several top plates to close inward or unfold outward.

[0022] As a further description of the above technical solution, a first hydraulic cylinder is fixedly installed on the frame, and a lifting plate is fixedly installed at the output end of the first hydraulic cylinder. The lifting plate is slidably connected to the frame, and two sets of clamping cylinders for clamping steel plates are fixedly installed on the lifting plate.

[0023] This embodiment also discloses a method for processing leaf springs, including using the above-mentioned leaf spring forming equipment, and further including the following steps:

[0024] The output end drive spindle of the sixth hydraulic cylinder is inserted into the swing arm frame;

[0025] The steel plate with heated ends is placed and fixed, and the clamping arm clamps the ends of the steel plate by cooperating with the mandrel.

[0026] The output end of the drive component drives the clamping arm to rotate, and the output end of the moving component drives the clamping arm to move towards the center, so that the steel plate is bent and shaped to fit the outer diameter surface of the mandrel.

[0027] The output end of the sixth hydraulic cylinder drives the spindle to disengage from the steel plate lug.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. This invention, through the design of a centering component and a uniform outer diameter bushing, quickly clamps bushings with different inner diameters, simplifying the mandrel replacement process; the fifth hydraulic cylinder pushes the rotating frame, allowing the bushing to be inserted into the support hole for positioning, without the need to disassemble the clamping arm or adjust the size of the support hole, solving the problem of disassembling the fixed connection when replacing the mandrel in the traditional way, greatly shortening the changeover time, and improving the equipment's adaptability to different specifications of rolled ears.

[0030] 2. The dual-set centering components and motor drive switching design of the rotating assembly of this invention realizes the automated replacement of the mandrel and avoids manual contact with high-temperature components; the two sets of centering components are symmetrically distributed about the transmission shaft, and the motor drives the transmission shaft to rotate, so that the positions of the upper and lower sets of mandrels / sleeves are interchanged; the fifth hydraulic cylinder pushes the rotating frame to complete the positioning of the new mandrel, and there is no need to manually disassemble the high-temperature mandrel throughout the process, which significantly reduces the risk of burns and the difficulty of operation, and improves production safety.

[0031] 3. The present invention adopts a symmetrical layout of dual moving components to support the synchronous forming of ear rolls at both ends of the steel plate. When the inner diameter of the ear rolls at both ends of the steel plate is equal, both ends can be heated synchronously and processed by two sets of clamping arms respectively, saving the waiting time of single-sided processing. Synchronous forming not only ensures that the ear rolls at both ends are of consistent precision, but also significantly improves the processing efficiency, which is especially suitable for mass production scenarios.

[0032] 4. After the bushing of the present invention is inserted into the support hole, it forms a radial constraint with the sliding frame. Combined with the axial preload generated by the fifth hydraulic cylinder pushing the rotating frame, it can effectively resist the radial pressure of the top block on the mandrel and prevent the mandrel from bending or shifting. At the same time, the bushing and the mandrel slide together to ensure the smooth rotation of the mandrel during the ear rolling process, further improving the molding stability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the lifting plate connection structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the connection structure of the second hydraulic cylinder of the steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the mandrel connection structure of a steel leaf spring forming device disclosed in a preferred embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the clamping arm connection structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0038] Figure 6 This is a partial cross-sectional view of a steel leaf spring forming apparatus disclosed in a preferred embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the rotating component connection structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0040] Figure 8This is a schematic diagram of the centering component connection structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the centering component structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0042] Figure 10 This is a schematic diagram of the adjustment block connection structure of a steel leaf spring forming equipment disclosed in a preferred embodiment of the present invention;

[0043] Figure 11 This is a diagram showing the mandrel position distribution of a leaf spring forming device according to a preferred embodiment of the present invention.

[0044] The following are the labeling instructions in the diagram: 1. Frame; 11. First hydraulic cylinder; 12. Lifting plate; 13. Clamping cylinder; 2. Moving assembly; 21. Second hydraulic cylinder; 22. Sliding frame; 23. Arc plate; 24. Limiting groove; 25. Arc block; 3. Clamping arm; 31. Swing arm frame; 32. Support shaft; 33. Positioning hole; 34. Support hole; 35. Third hydraulic cylinder; 36. Top block; 4. Drive assembly; 41. Fourth hydraulic cylinder; 42. Gear; 43. Rack; 5. Rotating assembly; 51. 52. Motor; 53. Drive shaft; 54. Rotating frame; 55. Sleeve; 56. Connecting block; 57. Guide block; 58. Fifth hydraulic cylinder; 6. Centering assembly; 69. Support plate; 60. Threaded rod; 61. Top plate; 62. Arc groove; 63. Limiting rod; 64. Guide groove; 65. Adjusting block; 66. Toggle rod; 77. Through hole; 88. Sixth hydraulic cylinder; 99. Connecting frame; 100. Positioning groove; 11. Mandrel; 12. Positioning rod; 13. Limiting plate; 14. Bushing; 15. Groove. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Reference Figures 1 to 11 This embodiment discloses a steel leaf spring forming device, including a frame 1. A first hydraulic cylinder 11 is fixedly installed on the frame 1. A lifting plate 12 is fixedly installed at the output end of the first hydraulic cylinder 11. The lifting plate 12 is slidably connected to the frame 1. Two sets of clamping cylinders 13 are fixedly installed on the lifting plate 12 for clamping and fixing the steel plate. Two sets of moving components 2 are installed on the frame 1.

[0047] Reference Figure 1 , Figure 3 and Figure 4 The moving component 2 includes a second hydraulic cylinder 21 fixedly mounted on the frame 1. A sliding frame 22 is fixedly mounted on the output end of the second hydraulic cylinder 21. The sliding frame 22 is slidably connected to the frame 1. Two sets of arc-shaped plates 23 are fixedly mounted on the sliding frame 22. The two sets of arc-shaped plates 23 are concentric. Limit grooves 24 are formed on the arc-shaped plates 23. The bottom and top ends of the two sets of arc-shaped plates 23 are spaced apart. An arc-shaped block 25 is fixedly mounted on the sliding frame 22. A clamping arm 3, a drive component 4, and a rotating component 5 are mounted on the sliding frame 22.

[0048] Reference Figure 1 , Figure 5 and Figure 6 The clamping arm 3 includes a swing arm frame 31, which is rotatably connected to the sliding frame 22 via a support shaft 32. The swing arm frame 31 is provided with a positioning hole 33 and a support hole 34 coaxial with the support shaft 32. The positioning hole 33 is located on one side of the support shaft 32, and the positioning hole 33 and the support hole 34 are located on opposite sides of the swing arm frame 31. A third hydraulic cylinder 35 is fixedly installed on the swing arm frame 31, and a top block 36 is fixedly installed at the output end of the third hydraulic cylinder 35.

[0049] The drive assembly 4 includes a fourth hydraulic cylinder 41 mounted on the sliding frame 22 and a gear 42 fixedly mounted on the support shaft 32. A rack 43 fixedly mounted on the output end of the fourth hydraulic cylinder 41 meshes with the gear 42 for transmission, and the rack 43 is slidably connected to the sliding frame 22. The output end of the fourth hydraulic cylinder 41 drives the rack 43 to move, and through meshing with the gear 42, drives the support shaft 32 and the clamping arm 3 to rotate, thereby realizing the adjustment of the clamping position of the top block 36.

[0050] Reference Figures 5 to 8 The rotating assembly 5 includes a motor 51 fixedly mounted on a sliding frame 22, a drive shaft 52 fixedly mounted on the output end of the motor 51 and rotatably connected to the sliding frame 22, an arc plate 23 coaxial with the drive shaft 52, a rotating frame 53 slidably mounted on the end of the drive shaft 52 away from the motor 51, a sleeve 54 fixedly mounted on the rotating frame 53, the sleeve 54 being fitted onto the drive shaft 52, a connecting block 55 rotatably mounted on the sleeve 54, and several guide blocks 56 fixedly mounted on the rotating frame 53; the rotating assembly 5 also includes a fifth hydraulic cylinder 57, the output end of the fifth hydraulic cylinder 57 being fixedly connected to the connecting block 55, the output end of the fifth hydraulic cylinder 57 pushing the connecting block 55 and the sleeve 54 to move, thereby driving the rotating frame 53 to slide along the axial direction of the drive shaft 52.

[0051] Reference Figures 7 to 10Two sets of centering components 6 are installed on the rotating frame 53. The two sets of centering components 6 are symmetrically distributed about the axis of the transmission shaft 52. The centering components 6 include a support plate 61 rotatably connected to the rotating frame 53, a threaded rod 62 rotatably connected to the rotating frame 53, and several top plates 63 slidably connected to guide blocks 56. The support plate 61 has several arc-shaped grooves 64 arranged in a circular array around the center of the support plate 61. The distance between the arc-shaped grooves 64 and the center of the support plate 61 gradually decreases or increases from one end to the other. A limit rod 65 is fixedly installed on the top plate 63 and slides within the arc-shaped grooves 64. A guide groove 66 is provided on the support plate 61. An adjusting block 67 is threadedly fitted on the threaded rod 62. A lever 68 is fixedly installed on the adjusting block 67 and slides within the guide groove 66. The lever 68 passes through the guide groove 66 and is slidably connected to the rotating frame 53. A through hole 69 is provided on the support plate 61. By rotating the threaded rod 62, the support plate 61 can be rotated. When the support plate 61 rotates, the limiting rod 65 slides in the arc groove 64, thereby causing several top plates 63 to close inward or unfold outward.

[0052] Reference Figure 1 , Figure 4 and Figure 11 A sixth hydraulic cylinder 7 is fixedly installed on the sliding frame 22. A connecting frame 71 is fixedly installed on the output end of the sixth hydraulic cylinder 7. A positioning groove 72 is provided on the connecting frame 71. The output end of the sixth hydraulic cylinder 7 is coaxial with the support hole 34.

[0053] Reference Figure 4 , Figure 6 and Figure 11 The molding equipment also includes several mandrels 8 and bushings 9 that match the mandrels 8. The bushings 9 are movably connected to the mandrels 8, that is, the mandrels 8 can rotate or slide within the bushings 9. The bushings 9 are used to guide the mandrels 8. One end of the mandrel 8 is fixedly installed with a positioning rod 81, and the other end is fixedly installed with a limiting plate 82. The limiting plate 82 can move along the limiting groove 24 and be inserted into the positioning groove 72. When the limiting plate 82 is inserted into the positioning groove 72, the output end of the sixth hydraulic cylinder 7 can drive the limiting plate 82, the mandrel 8 and the positioning rod 81 to move through the connecting frame 71, so that the positioning rod 81 is inserted into the positioning hole 33. At this time, the mandrel 8 is located in the pressing area of ​​the top block 36.

[0054] When the mandrel 8 is replaced, the bushing 9 is replaced accordingly to ensure that the two are compatible. Several bushings 9 have the same outer diameter and the same inner diameter as the corresponding mandrel 8. When forming different inner diameters of the rolled ears, the difficulty of replacement is reduced by quickly replacing different mandrels 8 and bushings 9. This solves the problem that the traditional replacement of mandrel 8 requires disassembling the fixed connection between the mandrel 8 and the hydraulic cylinder output end, which is difficult, and also solves the problem that the clamping arm 3 needs to be disassembled so that the support hole 34 can adapt to the new diameter of the mandrel 8.

[0055] Reference Figure 8 The bushing 9 has a groove 91, the length of which is equal to the length of the top plate 63. The top plate 63 of the centering component 6 can be inserted into the groove 91 to clamp and fix the bushing 9. The output end of the fifth hydraulic cylinder 57 pushes the rotating frame 53, the centering component 6 and the clamped bushing 9 to move, so that the bushing 9 is inserted into the support hole 34, thereby providing stable support for the spindle 8 and preventing the spindle 8 from being bent by the top block 36, thus improving the stability of the support and sliding of the spindle 8. The inner diameter of the through hole 69 is larger than the outer diameter of the bushing 9, reducing the difficulty of replacing the bushing 9 in the future.

[0056] The two sets of centering components 6 on the rotating frame 53 can clamp two different sets of mandrels 8. Therefore, when changing the mandrel 8, the upper and lower sets of mandrels 8 can be automatically switched without manually disassembling the high-temperature mandrel 8, which further reduces the risk of burns and the difficulty of operation, and improves the safety of operation.

[0057] The distance between the tops of the two sets of arc plates 23 is less than the outer diameter of the limiting plate 82, and the distance between the bottoms of the two sets of arc plates 23 is greater than the outer diameter of the limiting plate 82. When the rotating frame 53 and the centering component 6 drive the spindle 8 to switch up and down, the limiting groove 24 can limit the limiting plate 82, so that the limiting plate 82 can be accurately inserted into the positioning groove 72 of the connecting frame 71. When the limiting plate 82 slides from the top to the bottom of the limiting groove 24 of the arc plate 23, it can smoothly disengage from the arc plate 23 to avoid interference. The arc block 25 is used to support the limiting plate 82 when the upper spindle 8 is initially placed, keeping the spindle 8 horizontal.

[0058] It should be noted that the displacement of the hydraulic cylinder can be measured by a laser sensor. Obtaining the movement distance of the hydraulic cylinder output end by a laser sensor is existing technology, and will not be elaborated on further here.

[0059] This embodiment also discloses a method for processing steel leaf springs, including the following steps:

[0060] S1. The steel plate with heated end is precisely placed on the lifting plate 12 by the robotic arm and clamped and fixed by the clamping cylinder 13. The output end of the second hydraulic cylinder 21 drives the sliding frame 22 and the clamping arm 3 to move, so that the highest point of the mandrel 8 is aligned with and in contact with the end of the steel plate. The output end of the third hydraulic cylinder 35 drives the top block 36 to descend and press the steel plate onto the mandrel 8.

[0061] S2, the output end of the fourth hydraulic cylinder 41 pushes the rack 43 to move, and through the meshing transmission of the rack 43 and the gear 42, it drives the support shaft 32 and the clamping arm 3 to rotate. At the same time, the output end of the second hydraulic cylinder 21 drives the sliding frame 22 and the clamping arm 3 to move towards the middle of the frame 1. According to the formula The displacement of the output end of the second hydraulic cylinder 21 and the rotation angle of the support shaft 32 are controlled. The end of the steel plate is wound around the surface of the mandrel 8 under the pressing and rotation of the top block 36, thereby achieving precise earing of the end of the steel plate and reducing the deviation of the inner diameter of the earing. Here, s is the displacement change of the second hydraulic cylinder 21; θ is the angle change of the support shaft 32; and r is the radius of the mandrel 8.

[0062] S3. After the ear is rolled, the output end of the third hydraulic cylinder 35 retracts and drives the top block 36 to detach from the steel plate. The output end of the sixth hydraulic cylinder 7 drives the connecting frame 71, the limiting plate 82 and the spindle 8 to move, so that the positioning rod 81 moves from the positioning hole 33 to the support hole 34. The spindle 8 detaches from the steel plate ear. The output end of the sixth hydraulic cylinder 7 extends and pushes the sliding frame 22 and the clamping arm 3 to move, so that the steel plate ear is detached from the clamping area of ​​the clamping arm 3.

[0063] S4. The robotic arm grabs the steel plate, and the output end of the clamping cylinder 13 disengages from the steel plate. The robotic arm transfers the processed steel plate and places the next steel plate to be processed back on the lifting plate 12 for fixation. At the same time, the output end of the sixth hydraulic cylinder 7 drives the connecting frame 71, the limiting plate 82 and the spindle 8 to move, so that the positioning rod 81 is inserted into the positioning hole 33 again, in preparation for the next ear rolling.

[0064] It should be noted that when the inner diameters of the lugs at both ends of the leaf spring are equal, both ends of the steel plate can be heated simultaneously, and the lugs at the ends of the steel plate can be clamped by two sets of clamping arms 3 respectively, so as to realize the simultaneous forming of the lugs at both ends of the leaf spring. The operation process of double-sided lugs is the same as that of single-sided lugs, and will not be described in detail here. Therefore, this embodiment can accurately calculate the variable relationship between the displacement change of the second hydraulic cylinder 21, the angle change of the support shaft 32, and the radius of the mandrel 8, and realize the simultaneous forming of lugs on both sides under the premise of ensuring the support of the mandrels 8 at both ends. This not only improves the lug accuracy, but also improves the processing and forming efficiency.

[0065] When it is necessary to change the coiling process of the leaf spring, such as increasing the inner diameter of the coiling lug, it is necessary to replace the mandrel 8 with one of appropriate diameter and the bushing 9. Specifically, the bushing 9 to be replaced is fitted onto the corresponding mandrel 8. The mandrel 8 and bushing 9 are inserted between several top plates 63. At the same time, the limiting plate 82 passes through the limiting groove 24 and abuts against the top of the arc block 25. The threaded rod 62 is screwed on, which drives the adjusting block 67 to move through the threaded engagement. The adjusting block 67 drives the support plate 61 to rotate through the lever 68. When the support plate 61 rotates, the limiting rod 65 is acted upon by the arc groove 64, which drives several top plates 63 to close. Several top plates 63 are inserted into the groove 91 and clamp and fix the bushing 9. At this time, the mandrel 8 remains horizontal.

[0066] The output end of the fifth hydraulic cylinder 57 drives the connecting block 55, sleeve 54, rotating frame 53, centering component 6 and bushing 9 to move away from the clamping arm 3, so that the bushing 9 disengages from the support hole 34. The upper spindle 8 is limited by the arc plate 23 and its position remains unchanged. The output end of the sixth hydraulic cylinder 7 retracts and drives the connecting frame 71 and spindle 8 to move until the limiting plate 82 moves to the bottom of the arc plate 23 and corresponds to the limiting groove 24. At this time, the positioning rod 81 at the end of the spindle 8 has disengaged from the support hole 34.

[0067] Motor 51 drives transmission shaft 52, rotating frame 53 and centering component 6 to rotate. Limiting plate 82 moves along limiting groove 24. The upper and lower sets of mandrels 8 and bushings 9 are interchanged. Before the limiting plate 82 on the new mandrel 8 moves to the bottom, it will gradually insert into the positioning groove 72 for positioning. The output end of the fifth hydraulic cylinder 57 drives the connecting block 55, sleeve 54, rotating frame 53, centering component 6 and bushing 9 to move closer to the clamping arm 3, so that the new bushing 9 is inserted into the support hole 34. The output end of the sixth hydraulic cylinder 7 extends and drives the connecting frame 71 and mandrel 8 to move, so that the positioning rod 81 is inserted into the positioning hole 33 for positioning, in preparation for the subsequent ear rolling.

[0068] By replacing the two sets of mandrels 8, contact with the high-temperature mandrel 8 can be effectively avoided when replacing the mandrel 8, thereby reducing the risk of burns and improving the safety of production and processing. The two sets of mandrels 8 can be automatically switched, effectively reducing the difficulty of replacing the mandrel 8. After the mandrel 8 cools down to room temperature, the mandrel 8 can be removed. The cooling process of the mandrel 8 does not affect the processing of the leaf spring coil.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A steel leaf spring forming equipment, characterized in that: Includes a frame, on which two sets of moving components are mounted, and the output end of the moving components is equipped with a clamping arm and a drive component; The moving component includes a second hydraulic cylinder fixedly mounted on the frame, a sliding frame fixedly mounted on the output end of the second hydraulic cylinder, the sliding frame being slidably connected to the frame, two sets of arc plates fixedly mounted on the sliding frame, the arc plates being coaxial with the transmission shaft, limit grooves being provided on the arc plates, and arc blocks fixedly mounted on the sliding frame. The clamping arm includes a swing arm frame, the output end of the drive component is connected to the swing arm frame, and drives the swing arm frame to rotate on the output end of the moving component; the swing arm frame is provided with positioning holes and support holes; The rotating assembly includes a motor, a drive shaft mounted on the output end of the motor is rotatably connected to the output end of the moving assembly, a rotating frame is slidably mounted on one end of the drive shaft, a sleeve mounted on the rotating frame is fitted onto the drive shaft, and a connecting block rotatably mounted on the sleeve is fixedly connected to the output end of the fifth hydraulic cylinder. The rotating frame is equipped with two sets of centering components for clamping and centering the bushing; The output end of the moving component is equipped with a sixth hydraulic cylinder, and the end of the spindle that is adapted to the bushing is inserted into the output end of the sixth hydraulic cylinder. A positioning rod is fixedly installed at one end of the mandrel, and a limiting plate is fixedly installed at the other end; a connecting frame is installed at the output end of the sixth hydraulic cylinder, and the limiting plate is inserted into the connecting frame; Both sets of curved plates have a set spacing at the bottom and top, with the top spacing being smaller than the outer diameter of the limiting plate and the bottom spacing being larger than the outer diameter of the limiting plate. The output end of the fifth hydraulic cylinder drives the connecting block, sleeve, rotating frame, centering assembly and bushing to move away from the clamping arm, so that the bushing disengages from the support hole. The upper spindle is limited by the arc plate and its position remains unchanged. The output end of the sixth hydraulic cylinder retracts and drives the connecting frame and spindle to move until the limiting plate moves to the bottom of the arc plate and corresponds to the limiting groove. At this time, the positioning rod at the end of the spindle has disengaged from the support hole.

2. The steel leaf spring forming equipment according to claim 1, characterized in that: The only difference between several mandrels is their outer diameter, and the only difference between several bushings is their inner diameter.

3. The steel leaf spring forming equipment according to claim 1, characterized in that: The axes of the positioning hole and the support hole are collinear with the axis of rotation of the swing arm frame; the bushing mates with the support hole; and the positioning rod mates with the positioning hole. A third hydraulic cylinder is fixedly installed on the swing arm, and a top block is fixedly installed on the output end of the third hydraulic cylinder.

4. The steel leaf spring forming equipment according to claim 1, characterized in that: The connecting frame is provided with a positioning groove.

5. The steel leaf spring forming equipment according to claim 1, characterized in that: The centering assembly includes a support plate rotatably connected to the rotating frame and several top plates slidably connected to the rotating frame. Several arc-shaped grooves are provided on the support plate, and limit rods are fixedly installed on the top plate. The limit rods slide within the arc-shaped grooves. The bushing has a groove, the length of which is equal to the length of the top plate. The top plate is inserted into the groove to clamp and fix the bushing.

6. The steel leaf spring forming equipment according to claim 5, characterized in that: The centering assembly also includes a threaded rod rotatably connected to the rotating frame. A guide groove is provided on the support plate. An adjusting block is threadedly fitted on the threaded rod. A lever is fixedly installed on the adjusting block. The lever slides in the guide groove and is slidably connected to the rotating frame through the guide groove. By rotating the threaded rod, the support plate can be driven to rotate. When the support plate rotates, the limiting rod slides in the arc-shaped groove, thereby driving several top plates to close inward or unfold outward.

7. The steel leaf spring forming equipment according to claim 1, characterized in that: A first hydraulic cylinder is fixedly installed on the frame, and a lifting plate is fixedly installed at the output end of the first hydraulic cylinder. The lifting plate is slidably connected to the frame, and two sets of clamping cylinders for clamping steel plates are fixedly installed on the lifting plate.

8. A method for processing leaf springs, comprising using the leaf spring forming equipment according to any one of claims 1-7, characterized in that: It also includes the following steps: The output end drive spindle of the sixth hydraulic cylinder is inserted into the swing arm frame; The steel plate with heated ends is placed and fixed, and the clamping arm clamps the ends of the steel plate by cooperating with the mandrel. The output end of the drive component drives the clamping arm to rotate, and the output end of the moving component drives the clamping arm to move towards the center, so that the steel plate is bent and shaped to fit the outer diameter surface of the mandrel. The output end of the sixth hydraulic cylinder drives the spindle to disengage from the steel plate lug.

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