Pre-pressing, tempering and hot polishing tool and pre-pressing, tempering and hot polishing process
By designing pre-pressure tempered thermal casting tooling and automated control system, the problems of low production efficiency and difficult to ensure quality consistency in the existing thermal stress shot blasting process are solved, efficient and stable spring processing is achieved, and fatigue strength and stress corrosion resistance are improved.
Patent Information
- Application Number
- CN202510708737.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2025-08-22
AI Technical Summary
The existing thermal stress shot blasting process is carried out by clamping the tempered springs of the robotic arm, resulting in low production efficiency, difficult to ensure quality consistency, and insufficient automation.
A pre-pressure tempered heat casting tooling is designed, including a limiting mechanism and an automated control system, which can clamp two springs at the same time for shot blasting. The automatic control system is used to monitor the shot blasting parameters to ensure the consistency of the treatment effect, and to adapt to the fixed needs of springs of different specifications through the limiting mechanism.
It significantly improves production efficiency, improves the fatigue strength and stress corrosion resistance of the spring, ensures the high quality and reliability of the spring, expands the scope of application of the tooling, and reduces production costs.
Smart Images
Figure CN120519678A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field related to commercial vehicle brake springs, and in particular to a pre-compression, tempering, and hot polishing tool and a pre-compression, tempering, and hot polishing process. Background Art
[0002] Commercial vehicle brake springs are key components in the vehicle's braking system. Their performance directly affects the vehicle's braking effect and safety. With the rapid development of the commercial vehicle market, higher requirements are placed on the durability, fatigue resistance and reliability of brake springs. The thermal stress shot blasting process is a technology that uses the residual heat left after the spring is compressed to a certain height and tempered. The spring surface is shot blasted with high-speed steel shots using a robotic gripper, which can effectively improve the spring's fatigue strength and stress corrosion resistance.
[0003] At present, shot blasting is an important link in the production process of commercial vehicle brake springs. In the spring processing process, pre-compression hot shot blasting is carried out after tempering, which is usually called hot pressure treatment or stress shot blasting. The main purpose is to further optimize the performance and life of the spring by combining mechanical stress and thermal effect. Although tempering can eliminate some internal stress, micro-stress unevenness may still exist in the spring during subsequent processing or use. Pre-compression hot shot blasting further releases residual stress through mechanical impact and thermal action to prevent deformation or dimensional instability of the spring due to stress relaxation during use. Therefore, a pre-compression and tempering hot shot blasting tooling and a pre-compression and tempering hot shot blasting process are particularly needed.
[0004] However, the existing thermal stress shot blasting method is to clamp and compress the tempered spring by a robotic arm, and perform shot blasting in the clamped state, which requires a robotic arm and has low production efficiency. The existing shot blasting process has deficiencies in processing efficiency, uniformity and degree of automation, resulting in difficulty in ensuring the quality consistency of the spring and low production efficiency. Summary of the Invention
[0005] The object of the present invention is to provide a pre-compression and tempering hot blasting tool and a pre-compression and tempering hot blasting process to solve the problem that the existing thermal stress shot blasting proposed in the above background technology is to clamp and compress the tempered spring by a robotic arm, and perform shot blasting in the clamped state, which requires a robotic arm and has low production efficiency. The existing shot blasting process has deficiencies in processing efficiency, uniformity and degree of automation, resulting in difficulty in ensuring the quality consistency of the spring and low production efficiency.
[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a pre-pressing, tempering and hot polishing tool and a pre-pressing, tempering and hot polishing process, comprising a first fixing rod, one end surface of the first fixing rod being fixedly connected to a hanging ring, the other end surface of the first fixing rod being fixedly connected to a fixing column, one end surface of the fixing column being fixedly connected to a second fixing rod, one end surface of the second fixing rod being fixedly connected to a handle, an outer surface of the fixing column being fixedly connected to a limiting block, an outer surface of the limiting block being provided with a limiting groove, and an outer surface of the first fixing rod being fixedly connected to a limiting mechanism; The limiting mechanism includes a limiting block, which is installed on the outer surface of the first fixed rod, and a sliding groove is provided on the inner surface of the limiting block. The inner surface of the sliding groove is slidably connected to a sliding disc, and one end surface of the sliding disc is fixedly connected to a telescopic spring, and the other end surface of the sliding disc is fixedly connected to a connecting block, and one end surface of the connecting block is fixedly connected to a limiting plate.
[0007] Preferably, the outer surface of the first fixing rod is provided with a thread, and the inner surface of the fixing column is provided with a thread.
[0008] Preferably, the outer surface of the second fixing rod is provided with a thread, and the limiting mechanism is provided in two groups, and the other group of the limiting mechanism is threadedly connected to the second fixing rod.
[0009] Preferably, the outer surface of the handle is provided with anti-slip grooves, and the handle and the second fixing rod are threadedly connected to the first fixing rod via a fixing column.
[0010] Preferably, four groups of the limiting blocks are provided on the outer surface of the handle, and the limiting blocks are trapezoidal.
[0011] Preferably, the limiting grooves are symmetrically arranged in two groups on the outer surface of the limiting block, and each group is provided with three limiting blocks.
[0012] Preferably, the inner dimension of the sliding groove matches the outer dimension of the sliding disc, and the diameter of the sliding disc is larger than the diameter of the connecting block.
[0013] Preferably, the sliding groove, sliding disc, telescopic spring, connecting block and limiting plate are symmetrically arranged in two groups with the central axis of the limiting block, and the sliding disc, connecting block and limiting plate form a telescopic structure with the sliding groove through the telescopic spring.
[0014] A pre-pressing, tempering and hot polishing process, the specific steps are as follows: Step 1: Spring clamping: Press the limit plate to make the limit plate, the connecting block and the sliding disc slide in the sliding groove, release the blockage of the limit plate on the spring, place the spring on the outside of the first fixed rod and the second fixed rod, make one end of the spring fit into the limit groove on the outer surface of the limit block, and the other end is stably supported by the limit mechanism, and drive the second fixed rod and the fixed column to rotate by turning the handle, so that the fixed column is close to the first fixed rod, shortening the distance between the fixed column and a set of limit mechanisms, and at the same time, rotate the limit mechanism rotatably connected to the outer side of the second fixed rod to adjust the distance between it and the fixed column; Step 2: Pre-compression treatment: Use the tooling to pre-compress the spring and compress it to the first working height of the brake steam chamber; Step 3: Tempering treatment: Arrange the tooling with the spring in front of the continuous hot air tempering furnace, heat the spring and the tooling together to 330℃ and keep it warm for 15 minutes; Step 4. Shot blasting: Develop a production line with an automated control system. After the spring comes out of the tempering furnace, it uses its residual temperature greater than 250°C to control the manipulator to move the spring and the tooling to the shot blasting port through the automated control system. The automated control system can monitor key parameters such as shot blasting intensity and shot blasting time in real time to ensure the consistency of the treatment effect. It can also automatically adjust the operation of the shot blasting equipment according to the preset process parameters, and record and store key parameters in the shot blasting process in real time for subsequent analysis and quality traceability. It also has fault diagnosis and alarm functions. When key parameters such as shot blasting intensity and shot blasting time exceed the preset range or the equipment fails, the system can issue an alarm in time and take corresponding measures. Shot blasting is carried out in a compressed state, and the shot blasting equipment is started to use high-speed steel shots to blast the spring surface. Step 5. Subsequent processing: After the shot blasting is completed, the spring is compressed again, the limit steel rod is removed, and the spring is restored to its free height, and then surface treatment such as hanging and spraying is performed.
[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The tooling of the present invention can clamp two springs at a time and perform shot blasting production at the same time. Compared with the traditional process that can only process one spring at a time, the production efficiency is greatly improved, the shot blasting efficiency is improved, and the production cost is effectively reduced; 2. The present invention optimizes the shot blasting process and realizes simultaneous hot blasting and stress blasting under compression, which significantly increases the compressive stress on the spring surface and near the surface. The fatigue strength and stress corrosion resistance of the spring are greatly improved, the product defect rate is reduced, and the high quality and reliability of the spring are ensured. 3. The design of the limiting mechanism and limiting block of the tooling of the present invention can adapt to springs of different diameters and lengths. Whether it is a small outer diameter spring or a low aspect ratio spring, it can be stably clamped and shot blasted, which expands the applicability of the tooling and process. At the same time, the telescopic structure and adjustable design of the limiting mechanism make spring clamping more convenient and quick, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a side structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the first fixing rod and the fixing column cooperating with each other in the present invention; Figure 3 This is a schematic diagram of the structure of the first fixing rod and the lifting ring cooperating with each other in the present invention; Figure 4 This is a schematic diagram of the structure of the second fixing rod and the handle cooperating with each other in the present invention; Figure 5 This is a schematic cross-sectional view of the limiting mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the telescopic spring and the connecting block cooperating with each other in the present invention; Figure 7 This is a schematic diagram of the structure of the limiting block and the limiting groove cooperating with each other in the present invention.
[0017] In the figure: 1. first fixed rod; 2. lifting ring; 3. fixed column; 4. second fixed rod; 5. handle; 6. limiting block; 7. limiting groove; 8. limiting mechanism; 801. limiting block; 802. sliding groove; 803. sliding disc; 804. telescopic spring; 805. connecting block; 806. limiting plate. DETAILED DESCRIPTION
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] Example 1: See also Figure 1-7The present invention provides a technical solution: a pre-pressing, tempering and hot polishing tool and a pre-pressing, tempering and hot polishing process, comprising a first fixing rod 1, one end surface of the first fixing rod 1 is fixedly connected to a lifting ring 2, the other end surface of the first fixing rod 1 is fixedly connected to a fixing column 3, one end surface of the fixing column 3 is fixedly connected to a second fixing rod 4, one end surface of the second fixing rod 4 is fixedly connected to a handle 5, the outer surface of the fixing column 3 is fixedly connected to a limiting block 6, the outer surface of the limiting block 6 is provided with a limiting groove 7, and the outer surface of the first fixing rod 1 is fixedly connected to a limiting mechanism 8; The limiting mechanism 8 includes a limiting block 801, which is mounted on the outer surface of the first fixed rod 1, and a sliding groove 802 is provided on the inner surface of the limiting block 801. The inner surface of the sliding groove 802 is slidably connected to a sliding disc 803, and one end surface of the sliding disc 803 is fixedly connected to a telescopic spring 804, and the other end surface of the sliding disc 803 is fixedly connected to a connecting block 805, and one end surface of the connecting block 805 is fixedly connected to a limiting plate 806. Through the arrangement of the above structure, when in use, when the spring needs to be installed, the limiting plate 806 is pressed, and the limiting plate 806 is connected The connecting block 805 drives the sliding disc 803 to slide in the sliding groove 802, and at the same time compresses the telescopic spring 804, so that the limit plate 806 no longer blocks the installation position of the spring. After the spring is installed, the limit plate 806 is released, and the telescopic spring 804 is reset, pushing the sliding disc 803, the connecting block 805 and the limit plate 806 back to their original position to limit the spring. The limiting mechanism 8 can flexibly adapt to the installation and disassembly of the spring. Through the elastic action of the telescopic spring 804, the spring is automatically limited and stabilized, ensuring the stable position of the spring in the tooling, thereby improving the efficiency and accuracy of the spring installation.
[0020] Furthermore, the outer surface of the first fixing rod 1 is provided with a thread, and the inner surface of the fixing column 3 is provided with a thread. Through the arrangement of the above structure, when in use, the first fixing rod 1 and the fixing column 3 are connected by threads. The threaded connection method makes the connection between the first fixing rod 1 and the fixing column 3 tight and stable. At the same time, by rotating the fixing column 3, the position of the fixing column 3 on the first fixing rod 1 can be adjusted, thereby adjusting the length and structure of the entire tooling, thereby improving the versatility and adaptability of the tooling.
[0021] Furthermore, the outer surface of the second fixing rod 4 is provided with a thread, and two groups of limiting mechanisms 8 are provided, and the other group of limiting mechanisms 8 is threadedly connected to the second fixing rod 4. Through the setting of the above structure, when in use, the limiting mechanism 8 threadedly connected to the second fixing rod 4 can adjust its position on the second fixing rod 4 by rotating the limiting mechanism 8. The distance between the limiting mechanism 8 and the fixing column 3 can be controlled according to the specific situation of the spring to better adapt to the fixing requirements of springs of different lengths, thereby enhancing the adaptability of the tooling to springs of different specifications. The position of the limiting mechanism 8 is adjusted by thread to fix the spring, thereby improving the flexibility and practicality of the tooling to meet diversified production needs.
[0022] Furthermore, the outer surface of the handle 5 is provided with anti-slip grooves, and the handle 5 and the second fixed rod 4 are threadedly connected to the first fixed rod 1 through the fixed column 3. Through the setting of the above structure, when in use, the anti-slip grooves increase the friction between the operator's hand and the handle 5. When the operator holds the handle 5 to operate the workpiece, it can effectively prevent the hand from slipping, thereby improving the safety of the operation.
[0023] Furthermore, four groups of limiting blocks 6 are provided on the outer surface of the handle 5, and the limiting blocks 6 are trapezoidal. Through the setting of the above structure, when in use, the four groups of trapezoidal limiting blocks 6 are evenly distributed on the outside of the handle 5, and can support and position the spring from multiple directions. The trapezoidal shape design makes it easier for the spring to be inserted into the limiting groove 7 during installation, and can provide more stable support after being inserted. The setting of multiple groups of limiting blocks 6 increases the stability and accuracy of the spring positioning. The trapezoidal shape optimizes the installation process of the spring and improves work efficiency. At the same time, it also ensures the stability of the spring during the processing process and reduces the possibility of spring shaking and displacement.
[0024] Furthermore, two groups of limiting grooves 7 are symmetrically arranged on the outer surface of the limiting block 6, and each group is provided with three limiting blocks 6. Through the setting of the above structure, when in use, the two symmetrically arranged groups of limiting grooves 7 can simultaneously position and fix the two springs. Each group of three limiting grooves 7 can adapt to springs of different diameters for clamping, so that the tooling can handle multiple springs at the same time, adapt to springs of different sizes, and improve production efficiency.
[0025] Furthermore, the inner dimension of the sliding groove 802 is consistent with the outer dimension of the sliding disc 803, and the diameter of the sliding disc 803 is larger than the diameter of the connecting block 805. Through the setting of the above structure, when in use, the inner dimension of the sliding groove 802 is consistent with the outer dimension of the sliding disc 803, ensuring that the sliding disc 803 can slide smoothly in the sliding groove 802, reducing the possibility of shaking and jamming. The diameter of the sliding disc 803 is larger than the diameter of the connecting block 805, so that the sliding disc 803 plays a role of limiting and guiding during the sliding process, preventing the connecting block 805 from disengaging from the sliding groove 802. When the limiting plate 806 is pressed, the force is transmitted to the sliding disc 803 through the connecting block 805, and the sliding disc 803 slides smoothly in the sliding groove 802, compressing the telescopic spring 804, thereby improving the stability and reliability of the limiting mechanism 8.
[0026] Furthermore, the sliding groove 802, the sliding disc 803, the telescopic spring 804, the connecting block 805 and the limiting plate 806 are symmetrically arranged in two groups with the central axis of the limiting block 801. The sliding disc 803, the connecting block 805 and the limiting plate 806 form a telescopic structure with the sliding groove 802 through the telescopic spring 804. Through the setting of the above structure, when in use, the symmetrically arranged sliding groove 802, the sliding disc 803, the telescopic spring 804, the connecting block 805 and the limiting plate 806 can simultaneously apply a stable limiting force to the spring, ensuring that the position of the spring in the tooling is fixed, thereby increasing the stability of the device.
[0027] Working principle: When the spring needs to be installed, the limit plate 806 is pressed, and the limit plate 806 drives the sliding disc 803 to slide in the sliding groove 802 through the connecting block 805, and at the same time compresses the telescopic spring 804, so that the limit plate 806 no longer blocks the installation position of the spring. After the spring is installed, the limit plate 806 is released, and the telescopic spring 804 is reset, pushing the sliding disc 803, the connecting block 805 and the limit plate 806 back to their original positions, limiting the spring. The limit mechanism 8 can flexibly adapt to the installation and removal of the spring, and the elastic action of the telescopic spring 804 realizes automatic limiting of the spring. The first fixing rod 1 and the fixing column 3 are connected by a screw thread, and the second fixing rod 4 and the fixing column 3 are connected by a screw thread. Adjusting the position of the fixing column 3 on the first fixing rod 1 adjusts the length and structure of the entire tooling. The limiting mechanism 8, which is threadedly connected to the second fixing rod 4, can be adjusted in position on the second fixing rod 4 by rotating the limiting mechanism 8. The distance between the limiting mechanism 8 and the fixing column 3 can be controlled according to the specific situation of the spring, better adapting to the fixing requirements of springs of different lengths and enhancing the adaptability of the tooling to springs of different specifications. The position of the limiting mechanism 8 is adjusted by threading to fix the spring. Four sets of trapezoidal limiting blocks 6 are evenly distributed on the outside of the handle 5, which can support and position the spring from multiple directions. The trapezoidal shape design makes it easier for the spring to be inserted into the limiting groove 7 during installation and provides more stable support after insertion. The provision of multiple sets of limiting blocks 6 increases the stability and accuracy of spring positioning. The trapezoidal shape optimizes the spring installation process, improves work efficiency, and also ensures the stability of the spring during processing. The two symmetrically arranged sets of limiting grooves 7 can simultaneously position and fix two springs. Each set of three limiting grooves 7 can accommodate springs of different diameters for clamping, allowing the tooling to process multiple springs simultaneously and accommodate springs of different sizes.
[0028] Example 2: A pre-pressing, tempering and hot polishing process, the specific steps are as follows: Step 1: Spring clamping: Press the limit plate 806 to make the limit plate 806, the connecting block 805 and the sliding disc 803 slide in the sliding groove 802, release the blockage of the limit plate 806 on the spring, place the spring on the outside of the first fixing rod 1 and the second fixing rod 4, make one end of the spring fit into the limit groove 7 on the outer surface of the limit block 6, and the other end is stably supported by the limit mechanism 8, and by turning the handle 5, drive the second fixing rod 4 and the fixing column 3 to rotate, so that the fixing column 3 is close to the first fixing rod 1, shortening the distance between the fixing column 3 and a set of limit mechanisms 8, and at the same time, turn the limit mechanism 8 rotatably connected to the outer side of the second fixing rod 4 to adjust the distance between it and the fixing column 3; Step 2: Pre-compression treatment: Use the tooling to pre-compress the spring and compress it to the first working height of the brake steam chamber; Step 3: Tempering treatment: Arrange the tooling with the spring in front of the continuous hot air tempering furnace, heat the spring and the tooling together to 330℃ and keep it warm for 15 minutes; Step 4. Shot blasting: Develop a production line with an automated control system. After the spring comes out of the tempering furnace, it uses its residual temperature greater than 250°C to control the manipulator to move the spring and the tooling to the shot blasting port through the automated control system. The automated control system can monitor key parameters such as shot blasting intensity and shot blasting time in real time to ensure the consistency of the treatment effect. It can also automatically adjust the operation of the shot blasting equipment according to the preset process parameters, and record and store key parameters in the shot blasting process in real time for subsequent analysis and quality traceability. It also has fault diagnosis and alarm functions. When key parameters such as shot blasting intensity and shot blasting time exceed the preset range or the equipment fails, the system can issue an alarm in time and take corresponding measures. Shot blasting is carried out in a compressed state, and the shot blasting equipment is started to use high-speed steel shots to blast the spring surface. Step 5. Subsequent processing: After the shot blasting is completed, the spring is compressed again, the limit steel rod is removed, and the spring is restored to its free height, and then surface treatment such as hanging and spraying is performed.
[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A pre-pressing, tempering and hot-polishing tool, comprising a first fixing rod (1), characterized in that: One end surface of the first fixing rod (1) is fixedly connected to a lifting ring (2), the other end surface of the first fixing rod (1) is fixedly connected to a fixing column (3), one end surface of the fixing column (3) is fixedly connected to a second fixing rod (4), one end surface of the second fixing rod (4) is fixedly connected to a handle (5), the outer surface of the fixing column (3) is fixedly connected to a limiting block (6), the outer surface of the limiting block (6) is provided with a limiting groove (7), and the outer surface of the first fixing rod (1) is fixedly connected to a limiting mechanism (8); The limiting mechanism (8) comprises a limiting block (801), the limiting block (801) being mounted on the outer surface of the first fixed rod (1), the inner surface of the limiting block (801) being provided with a sliding groove (802), the inner surface of the sliding groove (802) being slidably connected to a sliding disc (803), one end surface of the sliding disc (803) being fixedly connected to a telescopic spring (804), the other end surface of the sliding disc (803) being fixedly connected to a connecting block (805), and one end surface of the connecting block (805) being fixedly connected to a limiting plate (806).
2. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The outer surface of the first fixing rod (1) is provided with a thread, and the inner surface of the fixing column (3) is provided with a thread.
3. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The outer surface of the second fixing rod (4) is provided with a thread, and the limiting mechanism (8) is provided in two groups, and the other group of the limiting mechanism (8) is threadedly connected to the second fixing rod (4).
4. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The outer surface of the handle (5) is provided with anti-slip grooves, and the handle (5) and the second fixing rod (4) are threadedly connected to the first fixing rod (1) via a fixing column (3).
5. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: Four groups of the limiting blocks (6) are provided on the outer surface of the handle (5), and the limiting blocks (6) are trapezoidal.
6. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The limiting grooves (7) are symmetrically arranged in two groups on the outer surface of the limiting blocks (6), and each group is provided with three limiting blocks (6).
7. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The inner dimension of the sliding groove (802) matches the outer dimension of the sliding disc (803), and the diameter of the sliding disc (803) is larger than the diameter of the connecting block (805).
8. The pre-pressing, tempering and hot polishing tool according to claim 1, characterized in that: The sliding groove (802), the sliding disc (803), the telescopic spring (804), the connecting block (805) and the limiting plate (806) are symmetrically arranged in two groups about the central axis of the limiting block (801). The sliding disc (803), the connecting block (805) and the limiting plate (806) form a telescopic structure with the sliding groove (802) through the telescopic spring (804).
9. A pre-pressing, tempering and hot polishing process, characterized by: The specific steps of the pre-pressing, tempering and hot polishing tooling according to any one of claims 1 to 8 are as follows: Step 1: Spring clamping: Press the limit plate (806) to make the limit plate (806), the connecting block (805) and the sliding disc (803) slide in the sliding groove (802), release the blockage of the limit plate (806) on the spring, place the spring on the outside of the first fixed rod (1) and the second fixed rod (4), make one end of the spring fit into the limit groove (7) on the outer surface of the limit block (6), and the other end is stably supported by the limit mechanism (8), and by turning the handle (5), the second fixed rod (4) and the fixed column (3) are driven to rotate, so that the fixed column (3) is close to the first fixed rod (1), shortening the distance between the fixed column (3) and a set of limit mechanisms (8), and at the same time, the limit mechanism (8) rotatably connected to the outside of the second fixed rod (4) is rotated to adjust the distance between it and the fixed column (3); Step 2: Pre-compression treatment: Use the tooling to pre-compress the spring and compress it to the first working height of the brake steam chamber; Step 3: Tempering treatment: Arrange the tooling with the spring in front of the continuous hot air tempering furnace, heat the spring and the tooling together to 330℃ and keep it warm for 15 minutes; Step 4. Shot blasting: Develop a production line with an automated control system. After the spring comes out of the tempering furnace, it uses its residual temperature greater than 250°C to control the manipulator to move the spring and the tooling to the shot blasting port through the automated control system. The automated control system can monitor key parameters such as shot blasting intensity and shot blasting time in real time to ensure the consistency of the treatment effect. It can also automatically adjust the operation of the shot blasting equipment according to the preset process parameters, and record and store key parameters in the shot blasting process in real time for subsequent analysis and quality traceability. It also has fault diagnosis and alarm functions. When key parameters such as shot blasting intensity and shot blasting time exceed the preset range or the equipment fails, the system can issue an alarm in time and take corresponding measures. Shot blasting is carried out in a compressed state, and the shot blasting equipment is started to use high-speed steel shots to blast the spring surface. Step 5. Subsequent processing: After the shot blasting is completed, the spring is compressed again, the limit steel rod is removed, and the spring is restored to its free height, and then surface treatment such as hanging and spraying is performed.