Leaf spring center hole positioning quenching device and quenching process

Abstract

The invention relates to a leaf spring center hole positioning quenching device and a quenching process, belonging to the technical field of leaf spring processing; the device comprises a quenching furnace, a quenching furnace robot, a quenching machine, a straightening machine and a transfer robot; the quenching furnace robot is located on one side of the quenching furnace, there are multiple quenching machines, and the multiple quenching machines are symmetrically distributed on both sides of the straightening machine and the transfer robot; a positioning motor A and a positioning motor B are fixed on one side of the straightening machine, the positioning motor A is transmission-connected to the positioning block A, and the positioning motor B is transmission-connected to the positioning block B; a visual system is installed directly above the straightening machine, the visual system can scan two leaf springs on the straightening machine, and send data to the corresponding positioning motors, and then the positioning motors perform centering adjustment on the leaf springs; the invention realizes positioning and quenching of the leaf spring by the center hole of the leaf spring through the positioning motor in cooperation with the visual system, thereby ensuring that the design datum of the leaf spring is consistent with the processing datum, and ensuring the product quality and the performance of the leaf spring.

Description

Technical Field

[0001] The invention relates to a leaf spring center hole positioning quenching device and a quenching process, belonging to the technical field of leaf spring processing. Background Art

[0002] Leaf springs, also known as steel leaf springs, are a common mechanical spring, mainly used in the suspension systems of various commercial vehicles and engineering vehicles. Leaf springs need to be quenched during production to increase the hardness and strength of the leaf springs while maintaining their good elasticity and plasticity. There are many processes before the leaf spring quenching process, including heat treatment and bending of the ends, and each process will cause the length of the spring to change.

[0003] In order to improve production efficiency, the method of quenching two leaf springs at the same time is adopted. The process is as follows: the robot takes out the two heated leaf springs from the quenching furnace, places them on the straightening machine for straightening, and then the positioning blocks on one side push the ends of the two leaf springs at the same time to make the ends of the two leaf springs flush. After positioning is completed, another robot moves the leaf spring to the quenching machine for quenching.

[0004] The existing quenching process is to position the ends of the two leaf springs. However, the design of leaf spring quenching is based on the center hole or the straight section. The center hole is located in the middle of the straight section. If the traditional end positioning process is used, it will be affected by the processing accuracy of the previous process of the leaf spring, causing the center of the leaf spring quenching to shift and the size to change, failing to meet the design requirements, and thus affecting the performance of the leaf spring. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a leaf spring center hole positioning quenching device and quenching process, to position and quench the leaf spring with the center hole, to ensure that the design datum of the leaf spring is consistent with the processing datum, and to ensure the product quality and leaf spring performance.

[0006] The leaf spring center hole positioning quenching device of the present invention comprises a quenching furnace, a quenching furnace robot, a quenching machine, a straightening machine and a transfer robot; the quenching furnace robot is located on one side of the quenching furnace, and the quenching furnace robot is used to take out the leaf spring heated in the quenching furnace and move it to the straightening machine; there are multiple quenching machines, and the multiple quenching machines are symmetrically distributed on both sides of the straightening machine and the transfer robot;

[0007] A positioning motor A and a positioning motor B are fixed on one side of the straightening machine. The positioning motor A is connected to the positioning block A through transmission, and the positioning motor B is connected to the positioning block B through transmission. The positioning block A and the positioning block B are used to position and adjust the leaf spring. A visual system is installed directly above the straightening machine. The visual system can scan the two leaf springs on the straightening machine, obtain the length of each leaf spring and the position information of the center hole, and send the data to the corresponding positioning motor, which then performs centering adjustment on the leaf spring.

[0008] Preferably, the quenching machine includes a quenching frame, the center of the quenching frame is slidably connected to a quenching middle slider, the quenching middle slider is driven up and down by a quenching middle oil cylinder, a quenching upper pressure plate is fixed on the quenching middle slider, and a quenching lower pressure plate is also fixed on the quenching frame, and the quenching lower pressure plate is located directly below the quenching upper pressure plate; the quenching upper pressure plate and the quenching lower pressure plate cooperate to perform preliminary positioning of the leaf spring.

[0009] Furthermore, a quenching side slider A and a quenching side slider B are slidably arranged on both sides of the quenching frame, and the quenching side slider A and the quenching side slider B are respectively located on both sides of the quenching middle slider, and the quenching side slider A is driven by the quenching side cylinder A to move up and down, and the quenching side slider B is driven by the quenching side cylinder B to move up and down. A plurality of quenching upper top teeth are installed on the quenching side slider A and the quenching side slider B, and the upper and lower positions of the quenching upper top teeth are adjustable; a plurality of quenching lower top teeth are installed on both sides of the quenching lower pressure plate on the quenching frame, and the upper and lower positions of the quenching lower top teeth are adjustable.

[0010] Preferably, the straightening machine includes a straightening frame, on which a straightening block A is fixed, a straightening machine cylinder is fixed on one side of the straightening frame, the front end of the straightening machine cylinder is connected to a straightening movable block, the straightening machine cylinder can drive the straightening movable block to move back and forth, a straightening block B is fixed on the straightening movable block, and a straightening block C is movably arranged between the straightening blocks A and B.

[0011] Furthermore, a support frame A is provided between the straightening block A and the straightening block C, and a support frame B is provided between the straightening block B and the straightening block C. The support frame A and the support frame B are used to support the leaf spring, and the support frame A and the support frame B are driven up and down by a driving device.

[0012] Preferably, the leaf spring center hole positioning quenching device also includes a tempering furnace, a tempering furnace robot and a turnover platform, the turnover platform is located at the output end of the transfer robot, the tempering furnace robot is located between the tempering furnace and the turnover platform, and the tempering furnace robot is used to transport the leaf spring on the turnover platform to the tempering furnace.

[0013] The present invention is based on the quenching process of the leaf spring center hole positioning quenching device, which includes the following steps:

[0014] S1. Before the quenching process begins, adjust the center of the transfer robot's gripper to be consistent with the center of the quenching upper platen and the quenching lower platen of the quenching machine, and adjust the positions of the quenching upper top teeth and the quenching lower top teeth to the corresponding positions according to the process requirements to ensure that the quenched product can meet the design requirements;

[0015] S2, the leaf spring enters the quenching furnace for heating. After the heating is completed, the quenching furnace robot takes out the leaf spring A and the leaf spring B from the quenching furnace, scans the leaf spring A and the leaf spring B under the visual system, and places them on the bracket A and the bracket B of the straightening machine respectively;

[0016] S3, the driving device drives the bracket A and the bracket B to descend, moves the leaf spring A to between the straightening block A and the straightening block C, and moves the leaf spring B to between the straightening block B and the straightening block C;

[0017] The straightening machine oil cylinder moves to push the straightening block B to move, so that the straightening block B, leaf spring B, straightening block C, leaf spring A and straightening block A fit closely in sequence, and the leaf springs A and B are straightened; after the straightening is completed, the driving device lifts the leaf springs A and B;

[0018] S4. After scanning leaf spring A and leaf spring B, the visual system obtains the length of each leaf spring and the position information of the center hole, and sends the data to positioning motor A and positioning motor B. Positioning motor A drives positioning block A to push the end of leaf spring A to adjust its position, and positioning motor B drives positioning block B to push the end of leaf spring B to adjust its position, so that the line connecting the center holes of leaf spring A and leaf spring B is parallel to the central axis of the straightening machine, and the line connecting the center holes of leaf spring A and leaf spring B is in line with the central axis of the gripper when the transfer robot grabs the leaf spring, and the centering adjustment is completed;

[0019] S5. The transfer robot grabs the leaf spring A and leaf spring B that have been adjusted and straightened, and places them on the quenching lower pressure plate. The gripper of the transfer robot remains clamped, and the quenching intermediate cylinder drives the quenching intermediate slide block to move downward, so that the quenching upper pressure plate contacts and presses the upper surfaces of the two leaf springs to ensure that the position of the leaf springs does not move; then the transfer robot releases the gripper and returns to its position, completing the loading action;

[0020] S6, quenching side oil cylinder A, quenching side oil cylinder B respectively drive quenching side slide block A, quenching side slide block B to move downward, so that the quenching upper top tooth and the quenching lower top tooth press the leaf spring, completing the leaf spring tightening and forming action; quenching side oil cylinder A, quenching side oil cylinder B make the quenching upper top tooth and the upper surface of the leaf spring maintain a certain pressure, ensuring that the leaf spring does not move during the quenching process, so as to ensure that the leaf spring can meet the design requirements after quenching;

[0021] S7, the quenching machine drives the leaf spring to move downward and enter the quenching oil tank. After entering the quenching oil tank, the quenching machine swings to exchange heat between the leaf spring and the quenching medium. The quenching swing time is set according to the thickness of the leaf spring. After the specified time is reached, the quenching machine rises, the quenching middle cylinder, the quenching side cylinder A and the quenching side cylinder B are reset, and the transfer robot takes the leaf spring from the quenching machine through the gripper and places it on the turnover platform.

[0022] S8, the tempering furnace robot takes the leaf spring from the turnover platform and puts it into the tempering furnace for the next production process; the transfer robot places the leaf spring on each quenching machine in turn for cyclic production to improve quenching efficiency.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The leaf spring center hole positioning quenching device and quenching process described in the present invention, through the positioning motor and the visual system, make the line connecting the center holes of the two leaf springs parallel to the center axis of the straightening machine, and the line connecting the center holes of the two leaf springs is colinear with the center axis of the gripper when the transfer robot grasps the leaf spring, thereby realizing positioning and quenching of the leaf spring by the center hole, thereby ensuring that the design datum of the leaf spring is consistent with the processing datum, ensuring the product quality and leaf spring performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 yes Figure 1 A partial enlarged view of the D area in the middle;

[0027] Figure 3 It is a structural diagram of the quenching machine;

[0028] Figure 4 It is a side partial cross-sectional view of the straightening machine;

[0029] Figure 5 This is a schematic diagram of the state when the visual system scans the leaf spring;

[0030] Figure 6 It is a structural diagram of a leaf spring.

[0031] In the figure: 1, quenching furnace; 2, quenching machine; 21, quenching side cylinder A; 22, quenching middle cylinder; 23, quenching middle slide; 24, quenching side cylinder B; 25, quenching side slide B; 26, quenching side slide A; 27, quenching upper top teeth; 28, quenching lower top teeth; 29, quenching upper pressure plate; 210, quenching lower pressure plate; 211, quenching rack; 3, tempering furnace; 4, straightening machine; 41, straightening rack; 42, straightening movable block; 43 , straightening machine cylinder; 44, positioning block B; 45, positioning motor B; 46, positioning motor A; 47, positioning block A; 48, straightening block A; 49, straightening block B; 410, support rack B; 411, straightening block C; 412, support rack A; 5, transfer robot; 6, turnover platform; 7, tempering furnace robot; 8, quenching furnace robot; 9, leaf spring A; 91, center hole; 92, straight section; 10, leaf spring B; 11, visual system. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments.

[0033] like Figures 1 to 6 As shown, this embodiment is implemented by the following technical solutions: including a quenching furnace 1, a quenching furnace robot 8, a quenching machine 2, a straightening machine 4 and a transfer robot 5; the quenching furnace robot 8 is located on one side of the quenching furnace 1, and the quenching furnace robot 8 is used to take out the leaf spring A9 and the leaf spring B10 heated in the quenching furnace 1, and move them to the straightening machine 4; there are four quenching machines 2, and the four quenching machines 2 are symmetrically distributed on both sides of the straightening machine 4 and the transfer robot 5; the leaf spring A9 and the leaf spring B10 are both provided with a straight section 92, and the center of the straight section 92 is processed with a center hole 91;

[0034] A positioning motor A46 and a positioning motor B45 are fixed on one side of the straightening machine 4. The positioning motor A46 is connected to the positioning block A47 through transmission, and the positioning motor B45 is connected to the positioning block B44 through transmission. The positioning block A47 and the positioning block B44 are used to position and adjust the leaf spring. A visual system 11 is installed directly above the straightening machine 4. The visual system 11 can scan the two leaf springs on the straightening machine 4, obtain the length of each leaf spring and the position information of the center hole, and send the data to the corresponding positioning motor, which then performs centering adjustment on the leaf spring.

[0035] In this embodiment, the quenching machine 2 includes a quenching frame 211, and the center of the quenching frame 211 is slidably connected to the quenching middle slider 23. The quenching middle slider 23 is driven up and down by the quenching middle oil cylinder 22. A quenching upper pressure plate 29 is fixed on the quenching middle slider 23, and a quenching lower pressure plate 210 is also fixed on the quenching frame 211. The quenching lower pressure plate 210 is located directly below the quenching upper pressure plate 29; the quenching upper pressure plate 29 and the quenching lower pressure plate 210 cooperate to perform preliminary positioning of the leaf spring.

[0036] A quenching side slider A26 and a quenching side slider B25 are slidingly arranged on both sides of the quenching frame 211. The quenching side slider A26 and the quenching side slider B25 are respectively located on both sides of the quenching middle slider 23. The quenching side slider A26 is driven by the quenching side cylinder A21 to move up and down, and the quenching side slider B25 is driven by the quenching side cylinder B24 to move up and down. A plurality of quenching upper top teeth 27 are installed on the quenching side slider A26 and the quenching side slider B25, and the upper and lower positions of the quenching upper top teeth 27 are adjustable; a plurality of quenching lower top teeth 28 are installed on both sides of the quenching lower pressure plate 210 on the quenching frame 211, and the upper and lower positions of the quenching lower top teeth 28 are adjustable.

[0037] The straightening machine 4 includes a straightening frame 41, on which a straightening block A48 is fixed, and a straightening machine oil cylinder 43 is fixed on one side of the straightening frame 41. The head end of the straightening machine oil cylinder 43 is connected to the straightening movable block 42, and the straightening machine oil cylinder 43 can drive the straightening movable block 42 to move back and forth. A straightening block B49 is fixed on the straightening movable block 42, and a straightening block C411 is movably arranged between the straightening blocks A48 and B49. A support frame A412 is arranged between the straightening blocks A48 and C411, and a support frame B410 is arranged between the straightening blocks B49 and C411. The support frames A412 and B410 are used to support leaf springs, and the support frames A412 and B410 are driven by a driving device to move up and down.

[0038] The leaf spring center hole positioning quenching device also includes a tempering furnace 3, a tempering furnace robot 7 and a turnover platform 6. The turnover platform 6 is located at the output end of the transfer robot 5. The tempering furnace robot 7 is located between the tempering furnace 3 and the turnover platform 6. The tempering furnace robot 7 is used to transport the leaf spring on the turnover platform 6 to the tempering furnace 3.

[0039] This embodiment is based on the quenching process of the leaf spring center hole positioning quenching device, and includes the following steps:

[0040] S1. Before the quenching process begins, adjust the gripper center of the transfer robot 5 to be consistent with the center of the quenching upper platen 29 and the quenching lower platen 210 of the quenching machine 2, and adjust the positions of the quenching upper top teeth 27 and the quenching lower top teeth 28 to the corresponding positions according to the process requirements to ensure that the quenched product can meet the design requirements;

[0041] S2, the leaf spring enters the quenching furnace 1 for heating. After the heating is completed, the quenching furnace robot 8 takes out the leaf spring A9 and the leaf spring B10 from the quenching furnace 1, scans the leaf spring A9 and the leaf spring B10 under the visual system 11, and places them on the bracket A412 and the bracket B410 of the straightening machine 4 respectively;

[0042] S3, the driving device drives the bracket A412 and the bracket B410 to descend, moves the leaf spring A9 to between the straightening block A48 and the straightening block C411, and moves the leaf spring B10 to between the straightening block B49 and the straightening block C411;

[0043] The straightening machine oil cylinder 43 is actuated to push the straightening block B49 to move, so that the straightening block B49, the leaf spring B10, the straightening block C411, the leaf spring A9 and the straightening block A48 are closely fitted in sequence, and the leaf spring A9 and the leaf spring B10 are straightened; after the straightening is completed, the driving device lifts the leaf spring A9 and the leaf spring B10;

[0044] S4, the visual system 11 scans the leaf spring A9 and the leaf spring B10 and obtains the length of each leaf spring and the position information of the center hole, and sends the data to the positioning motor A46 and the positioning motor B45. The positioning motor A46 drives the positioning block A47 to push the end of the leaf spring A9 to adjust its position, and the positioning motor B45 drives the positioning block B44 to push the end of the leaf spring B10 to adjust its position, so that the line connecting the center holes of the leaf spring A9 and the leaf spring B10 is parallel to the central axis of the straightening machine 4, and the line connecting the center holes of the leaf spring A9 and the leaf spring B10 is in line with the central axis of the gripper when the transfer robot 5 grabs the leaf spring, and the centering adjustment is completed;

[0045] S5, the transfer robot 5 grabs the leaf spring A9 and leaf spring B10 that have been adjusted and straightened, and places them on the quenching lower pressure plate 210. The gripper of the transfer robot 5 remains in a clamped state, and the quenching intermediate oil cylinder 22 drives the quenching intermediate slider 23 to move downward, so that the quenching upper pressure plate 29 contacts and presses the upper surfaces of the two leaf springs to ensure that the position of the leaf springs does not move; then the transfer robot 5 releases the gripper and returns to its position, completing the loading action;

[0046] S6, quenching side oil cylinder A21, quenching side oil cylinder B24 respectively drive quenching side slide block A26, quenching side slide block B25 to move downward, so that the quenching upper top tooth 27 and the quenching lower top tooth 28 press the leaf spring, completing the leaf spring tightening and forming action; the quenching side oil cylinder A21, quenching side oil cylinder B24 make the quenching upper top tooth 27 and the upper surface of the leaf spring maintain a certain pressure, ensuring that the leaf spring does not move during the quenching process, so as to ensure that the leaf spring can meet the design requirements after quenching;

[0047] S7, the quenching machine 2 drives the leaf spring to move downward and enter the quenching oil tank. After entering the quenching oil tank, the quenching machine 2 swings to exchange heat between the leaf spring and the quenching medium. The quenching swing time is set according to the thickness of the leaf spring. After the specified time is reached, the quenching machine 2 rises, the quenching middle cylinder 22, the quenching side cylinder A21 and the quenching side cylinder B24 are reset, and the transfer robot 5 removes the leaf spring from the quenching machine 2 through the gripper and places it on the turnover platform 6.

[0048] S8, the tempering furnace robot 7 takes the leaf spring from the turnover platform 6 and puts it into the tempering furnace 3 for the next production process; the transfer robot 5 places the leaf spring on each quenching machine 2 in turn, and the production is cyclic to improve the quenching efficiency.

Claims

1. A leaf spring center hole positioning quenching process, characterized in that: The following steps are involved: S1. Before the quenching process begins, the gripper center of the transfer robot (5) is adjusted to be consistent with the center of the quenching upper platen (29) and the quenching lower platen (210) of the quenching machine (2), and the positions of the quenching upper top teeth (27) and the quenching lower top teeth (28) are adjusted to corresponding positions according to process requirements to ensure that the quenched product can meet the design requirements; S2, the leaf spring enters the quenching furnace (1) for heating. After the heating is completed, the quenching furnace robot (8) takes out the leaf spring A (9) and the leaf spring B (10) from the quenching furnace (1), scans the leaf spring A (9) and the leaf spring B (10) under the visual system (11), and places them on the support rack A (412) and the support rack B (410) of the straightening machine (4), respectively; S3, the driving device drives the support frame A (412) and the support frame B (410) to descend, moves the leaf spring A (9) to between the straightening block A (48) and the straightening block C (411), and simultaneously moves the leaf spring B (10) to between the straightening block B (49) and the straightening block C (411); The straightening machine oil cylinder (43) is actuated to push the straightening block B (49) to move, so that the straightening block B (49), the leaf spring B (10), the straightening block C (411), the leaf spring A (9) and the straightening block A (48) are closely fitted in sequence, and the leaf spring A (9) and the leaf spring B (10) are straightened; after the straightening is completed, the driving device lifts up the leaf spring A (9) and the leaf spring B (10); S4, the visual system (11) scans the leaf spring A (9) and the leaf spring B (10) to obtain the length of each leaf spring and the position information of the center hole, and sends the data to the positioning motor A (46) and the positioning motor B (45). The positioning motor A (46) drives the positioning block A (47) to push the end of the leaf spring A (9) to adjust its position, and the positioning motor B (45) drives the positioning block B (44) to push the end of the leaf spring B (10) to adjust its position, so that the line connecting the center holes of the leaf spring A (9) and the leaf spring B (10) is parallel to the center axis of the straightening machine (4), and the line connecting the center holes of the leaf spring A (9) and the leaf spring B (10) is in line with the center axis of the gripper when the transfer robot (5) grasps the leaf spring, and the centering adjustment is completed; S5, the transfer robot (5) grabs the leaf spring A (9) and leaf spring B (10) that have been adjusted and straightened, and places them on the quenching lower pressure plate (210), the gripper of the transfer robot (5) remains in a clamped state, the quenching intermediate oil cylinder (22) drives the quenching intermediate slide block (23) to move downward, so that the quenching upper pressure plate (29) contacts and presses the upper surfaces of the two leaf springs, ensuring that the position of the leaf springs does not move; then the transfer robot (5) releases the gripper and returns to its original position, completing the loading action; S6, the quenching side oil cylinder A (21) and the quenching side oil cylinder B (24) respectively drive the quenching side slide block A (26) and the quenching side slide block B (25) to move downward, so that the quenching upper top tooth (27) and the quenching lower top tooth (28) press the leaf spring, completing the leaf spring tightening and forming action; the quenching side oil cylinder A (21) and the quenching side oil cylinder B (24) make the quenching upper top tooth (27) and the upper surface of the leaf spring maintain a certain pressure, ensuring that the leaf spring does not move during the quenching process, so as to ensure that the leaf spring can meet the design requirements after quenching; S7, the quenching machine (2) drives the leaf spring to move downward and enter the quenching oil tank. After entering the quenching oil tank, the quenching machine (2) swings to allow the leaf spring to exchange heat with the quenching medium. The quenching swing time is set according to the thickness of the leaf spring. After the specified time is reached, the quenching middle cylinder (22), the quenching side cylinder A (21) and the quenching side cylinder B (24) are reset. The transfer robot (5) removes the leaf spring from the quenching machine (2) through the gripper and places it on the turnover platform (6); S8, the tempering furnace robot (7) removes the leaf spring from the turnover platform (6) and places it in the tempering furnace (3) for the next production process; the transfer robot (5) places the leaf spring on each quenching machine (2) in turn, and the production is cyclical to improve the quenching efficiency.

2. The leaf spring center hole positioning quenching process according to claim 1 is characterized in that: The method is implemented by using a leaf spring center hole positioning quenching device, which comprises a quenching furnace (1), a quenching furnace robot (8), a quenching machine (2), a straightening machine (4) and a transfer robot (5); the quenching furnace robot (8) is located on one side of the quenching furnace (1); there are a plurality of quenching machines (2), and the plurality of quenching machines (2) are symmetrically distributed on both sides of the straightening machine (4) and the transfer robot (5); A positioning motor A (46) and a positioning motor B (45) are fixed to one side of the straightening machine (4); the positioning motor A (46) is connected to the positioning block A (47) in a transmission manner, and the positioning motor B (45) is connected to the positioning block B (44) in a transmission manner; and a visual system (11) for scanning the leaf spring is installed directly above the straightening machine (4).

3. The leaf spring center hole positioning quenching process according to claim 2, characterized in that: The quenching machine (2) comprises a quenching frame (211), the center of the quenching frame (211) is slidably connected to a quenching intermediate slider (23), the quenching intermediate slider (23) is driven by a quenching intermediate oil cylinder (22) to move up and down, a quenching upper pressing plate (29) is fixed on the quenching intermediate slider (23), and a quenching lower pressing plate (210) is also fixed on the quenching frame (211), and the quenching lower pressing plate (210) is located directly below the quenching upper pressing plate (29); the quenching upper pressing plate (29) and the quenching lower pressing plate (210) cooperate to perform preliminary positioning of the leaf spring.

4. The leaf spring center hole positioning quenching process according to claim 3 is characterized in that: A quenching side slider A (26) and a quenching side slider B (25) are slidably arranged on both sides of the quenching frame (211). The quenching side slider A (26) and the quenching side slider B (25) are respectively located on both sides of the quenching middle slider (23). The quenching side slider A (26) is driven by the quenching side oil cylinder A (21) to move up and down, and the quenching side slider B (25) is driven by the quenching side oil cylinder B (24) to move up and down. A plurality of quenching upper top teeth (27) are installed on both the quenching side slider A (26) and the quenching side slider B (25); and a plurality of quenching lower top teeth (28) are installed on both sides of the quenching lower pressure plate (210) on the quenching frame (211).

5. The leaf spring center hole positioning quenching process according to claim 2, characterized in that: The straightening machine (4) comprises a straightening frame (41), a straightening block A (48) is fixed on the straightening frame (41), a straightening machine oil cylinder (43) is fixed on one side of the straightening frame (41), the front end of the straightening machine oil cylinder (43) is connected to the straightening movable block (42), a straightening block B (49) is fixed on the straightening movable block (42), and a straightening block C (411) is movably arranged between the straightening block A (48) and the straightening block B (49).

6. The leaf spring center hole positioning quenching process according to claim 5, characterized in that: A support frame A (412) is provided between the straightening block A (48) and the straightening block C (411), and a support frame B (410) is provided between the straightening block B (49) and the straightening block C (411). The support frame A (412) and the support frame B (410) are driven by a driving device to move up and down.

7. The leaf spring center hole positioning quenching process according to claim 2, characterized in that: The leaf spring center hole positioning quenching device further comprises a tempering furnace (3), a tempering furnace robot (7) and a turnover platform (6), wherein the turnover platform (6) is located at the output end of the transfer robot (5), and the tempering furnace robot (7) is located between the tempering furnace (3) and the turnover platform (6).

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