A fully automated precision spring buckle replacement machine

Abstract

This invention discloses a fully automated precision spring buckle conversion machine, relating to the field of spring machine technology. It includes an eight-claw spring machine with a positioning mandrel in the middle and eight sets of linear slide rails. Each linear slide rail is fixedly mounted with a cutter via a sliding block. The left side of the eight-claw spring machine has a wire inlet end, and one of the sliding blocks is equipped with a stamping cutter located near the wire inlet end. This invention breaks through the limitations of traditional spring processing by integrating an automated punching and positioning structure on the eight-claw machine. Preliminary positioning is achieved through side wire inlet and internal stamping groove design. The stamping, bending, and cutting processes are integrated into a single machine, achieving fully automated and efficient production. Combined with an eccentric rotating wheel that adaptively rotates according to wire tension, it can automatically expand and tighten the wire during stamping, effectively preventing rigid damage, over-tensioning causing jamming, or under-tensioning causing positioning failure, thus improving the equipment's adaptability.

Description

Technical Field

[0001] This invention relates to the field of spring machine technology, specifically a fully automated precision spring snapping machine. Background Technology

[0002] The eight-claw spring machine is a highly representative CNC automated equipment in the spring manufacturing field. Its name comes from the eight independent workstations on the machine's work panel that resemble claw arms. These workstations constitute the core forming unit of the machine. The eight-claw spring machine is a high-end equipment developed on the basis of the traditional three-axis (wire feed axis, cam axis, and mandrel axis) mechanical spring machine, integrating modern CNC technology, servo drive technology, and mechatronics technology. It breaks through the physical limitations of the traditional mechanical cam spring machine and can efficiently and precisely manufacture various complex helical springs and wire forming products by precisely scheduling the movement of each axis through a computer control system. The eight-claw spring machine uses a main motor to synchronously drive eight cams through a camshaft. The cams then drive the corresponding crank arms and sliding blocks to perform linear reciprocating motion. The sequence of actions is determined by the angle of the cam plates. It has the advantages of simple structure, stable operation, low maintenance cost, and suitability for mass standardized production. Therefore, it has been widely used in small and medium-sized enterprises and large-scale production scenarios. Traditional eight-claw spring machines mainly focus on physical changes in wire, such as bending, winding, and twisting. When spring products require special structures, such as stamping structures like safety buckle holes at the ends of the formed spring, they often cannot be formed in one step on the spring machine. The pre-formed springs need to be transferred to specialized stamping equipment for secondary processing, which not only increases the number of steps but also lengthens the spring production cycle.

[0003] To address the aforementioned issues, this invention proposes a novel fully automated precision spring snap-fit ​​machine. This machine integrates the stamping and snap-fit ​​process with the existing eight-claw spring machine, achieving integrated completion of spring production and end safety hole stamping, effectively shortening the production cycle. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the purpose of the present invention is to provide a fully automated precision spring buckle conversion machine to solve the problem mentioned in the background that the current traditional eight-claw spring machine cannot form springs with safety buckle holes in one step, requiring secondary processing to increase production steps and extend the production cycle.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fully automated precision spring buckle conversion machine, comprising an eight-claw spring machine, wherein a positioning mandrel is provided in the middle of the eight-claw spring machine, and eight sets of linear slide rails are provided on the eight-claw spring machine. Each linear slide rail is fixedly mounted with a cutter by a sliding block. The left side of the eight-claw spring machine is provided with a wire inlet end, and a stamping cutter is mounted on one of the sliding blocks. The stamping cutter is located on the side near the wire inlet end. The positioning mandrel includes a main mandrel with a stamping groove inside. An eccentric wheel is installed inside the stamping groove. The stamping tool can stamp the wire to form a safety hole. The eccentric wheel can expand the wire outward during the stamping operation to stably engage it on the inner side of the stamping groove, thus preventing the wire from shifting or deforming during the stamping process.

[0006] Preferably, the stamping tool includes a base fixedly connected to the sliding block, and a stamping head is fixedly connected to the inner side of the base, the stamping head being installed facing the stamping groove; The wire enters from the inlet end, passes through the gap between the eccentric wheel and the inner wall of the stamping groove, and is then sent out. An abutment rod is fixedly connected to the inner wall of the stamping groove at a position away from the eccentric wheel.

[0007] Preferably, two sliding rods are slidably connected to the main spindle, one end of each sliding rod extends through to the outside of the main spindle and is fixedly connected to the inner side of the base, and a buffer spring is sleeved on the outside of each sliding rod.

[0008] Preferably, two drive plates are slidably connected to the top and bottom of the inner wall of the stamping groove, and a push plate is bolted to the upper and lower surfaces of the stamping cutter head, with the two drive plates and the two push plates fixedly connected in a one-to-one correspondence.

[0009] Preferably, a shaft runs through the interior of the eccentric wheel, and two limiting rods run through both ends of the shaft, with both limiting rods being fixedly connected to the inner wall of the stamping groove.

[0010] Preferably, both drive plates are provided with guide grooves, and the two ends of the shaft slide along the guide grooves on the two drive plates respectively; The first half of the guide groove is set as an inclined section, and the second half of the guide groove is set as a straight section.

[0011] Preferably, when the stamping cutter head moves progressively toward the stamping groove, the push plate drives the two drive plates to slide forward along the inner wall of the stamping groove, pre-expanding and attaching the wire to the inner side of the stamping groove to prevent the wire from deforming and shifting.

[0012] Preferably, two torsion springs are respectively sleeved at both ends of the shaft, one end of the torsion spring is fixedly connected to the outer wall of the shaft, and the other end of the torsion spring is fixedly connected to the eccentric wheel.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention overcomes the limitations of separating the "forming" and "punching" processes in traditional spring processing equipment. It integrates an automated punching and positioning structure into a standard eight-claw spring machine. By changing the wire inlet from the traditional rear end to the side, and with the design of the stamping groove inside the positioning mandrel, the wire naturally forms a 90-degree bend during feeding, achieving preliminary axial and radial positioning. Utilizing the original cam drive system and multi-station tool layout of the eight-claw spring machine, it integrates complex processes such as safety hole punching, wire bending, spring winding, and cutting and re-threading into a single machine. This eliminates the cost of adding separate stamping equipment and the tediousness of manual positioning, simplifying the processing flow, shortening the processing cycle, and achieving full automation and high efficiency in spring re-threading.

[0014] Furthermore, the internal expansion assembly is synchronously driven by the feeding motion of the stamping cutter head. Through the cooperation of the guide groove and the shaft on the drive plate, the linear feeding motion of the stamping cutter head is transformed into the lateral expansion motion of the eccentric wheel. This mechanism realizes "interval" positioning control. In the non-stamping stage, the wire and the groove wall maintain a small gap, which greatly reduces ineffective friction and ensures smooth and stable wire feeding. At the moment of stamping, the wire is forcibly expanded and tightly adhered to the inner wall of the stamping groove, taking into account the dual requirements of "smooth material feeding" and "no deviation in punching", thereby effectively protecting the positioning mandrel and improving the service life of the entire equipment.

[0015] This invention introduces a torsion spring elastic adjustment mechanism into the eccentric wheel mechanism. The eccentric wheel is not rigidly fixed, but connected to the shaft through a torsion spring. It can adaptively rotate according to the actual tension of the wire, thereby changing the effective outer diameter. When the wire tension is high, the eccentric wheel automatically adjusts its angle to reduce the outer diameter to prevent breakage. When the tension is low, the eccentric wheel experiences less force and rotates less, maintaining its original expansion state and ensuring stable positioning. This further improves the adaptability to processing wires of different specifications. This flexible contact method not only avoids damage to the inner wall of the wire caused by rigid expansion, but also effectively compensates for minor production errors in wire diameter, preventing positioning failure caused by excessive tension causing jamming or insufficient tension, and improving the equipment's adaptability to wires of different specifications and hardness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2This is a schematic diagram of the stamping tool and positioning mandrel structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the main spindle structure of the present invention.

[0019] Figure 4 This is a side sectional view of the main spindle of the present invention during the wire feeding process.

[0020] Figure 5 This is a top-view cross-sectional view of the main spindle of the present invention during the wire feeding process.

[0021] Figure 6 This is a schematic diagram of the connection structure between the drive board and the push plate of the present invention.

[0022] Figure 7 This is a schematic diagram of the eccentric wheel and shaft structure after separation according to the present invention.

[0023] Figure 8 This is a schematic diagram of the safety hole cutting process for the finished spring of the present invention.

[0024] In the diagram: 1. Octagonal spring machine; 2. Linear slide rail; 3. Sliding block; 4. Inlet end; 5. Main spindle; 6. Stamping groove; 7. Eccentric wheel; 8. Safety hole; 9. Base; 10. Stamping cutter head; 11. Sliding rod; 12. Buffer spring; 13. Drive plate; 14. Push plate; 15. Guide groove; 16. Shaft; 17. Limiting rod; 18. Torsion spring; 19. Abutment rod. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1 to 8 The present invention provides a technical solution: a fully automated precision spring buckle conversion machine, including an eight-claw spring machine 1, a positioning mandrel in the middle of the eight-claw spring machine 1, eight sets of linear slide rails 2 on the eight-claw spring machine 1, each linear slide rail 2 is fixedly mounted with a cutter by a sliding block 3, and a wire inlet end 4 is provided on the left side of the eight-claw spring machine 1, one of the sliding blocks 3 is mounted with a stamping cutter, and the stamping cutter is located on the side close to the wire inlet end 4; The positioning mandrel includes a main mandrel 5, a stamping groove 6 inside the main mandrel 5, an eccentric wheel 7 installed inside the stamping groove 6, a stamping tool that can stamp the wire to form a safety hole 8, and an eccentric wheel 7 that can expand the wire outward during the stamping operation to stably engage it in the inner wall of the stamping groove 6, thus preventing the wire from shifting or deforming during the stamping process. In this embodiment, as Figure 1 and Figure 2 As shown, the stamping tool includes a base 9 fixedly connected to the sliding block 3, and a stamping head 10 fixedly connected to the inner side of the base 9. The stamping head 10 is installed facing the stamping groove 6. The wire enters from the inlet end 4, passes through the gap between the eccentric wheel 7 and the inner wall of the stamping groove 6, and is then sent out. The inner wall of the stamping groove 6 is fixedly connected to an abutment rod 19 at a position away from the eccentric wheel 7. Two sliding rods 11 are slidably connected on the main spindle 5. One end of each sliding rod 11 extends through to the outside of the main spindle 5 and is fixedly connected to the inner side of the base 9. Both sliding rods 11 are fitted with buffer springs 12. It should be noted that in this embodiment, the eight-claw spring machine 1 is provided with eight sets of linear slide rails 2. The sliding block 3 on each linear slide rail 2 can drive the corresponding tool to move independently. A cam mechanism is provided on one side of each linear slide rail 2. The eight stations are driven synchronously by the same main motor through the cam. The action sequence is determined by the angle of the cam plate. It is suitable for mass standardized production and can cooperate to complete different processing operations. This device integrates an automated punching and positioning structure on the basis of the original eight-claw spring machine 1. It can complete the processing of the safety hole 8 at the end of the spring without manual assistance.

[0027] A stamping cutter is installed at one of the workstations, located on the leftmost side of the wire inlet 4. Various forming cutters, such as probes, cutters, top cutters, and impact cutters, are installed at the other seven workstations. Through precise reciprocating motion, the bending, winding, and cutting of the wire are completed. After the wire is fed in from the wire inlet 4, it passes through the gap between the eccentric wheel 7 and the inner wall of the stamping groove 6. Subsequently, the eight-claw spring machine 1 drives the sliding blocks 3 and the cutters to complete the overall processing of the spring. After the wire is formed, it is cut by a special cutter to obtain a complete spring product. This fully automatic bending and forming technology of the spring belongs to the existing eight-claw spring machine 1, which is known technology. This application will not describe it in detail here, but only describes the stamping forming method of the safety hole 8 in detail.

[0028] Specifically, in this embodiment, the stamping tool is mainly divided into two parts: a base 9 connected to the sliding block 3 and a stamping head 10 fixed on the base 9. The base 9 moves on the linear slide rail 2 driven by the sliding block 3, thereby driving the stamping head 10 to move synchronously towards or away from the stamping groove 6, realizing the feeding and resetting of the stamping head 10. At the same time, two sliding rods 11 slidably connected on the main spindle 5 are fixedly connected to the inner side of the base 9 at one end, and can slide synchronously with the base 9 when the stamping head 10 moves. With the help of the externally sleeved buffer spring 12, it can not only stably guide the movement of the stamping head 10, but also buffer the impact force generated during the stamping operation, avoid the stamping head 10 from deflecting due to the impact force, and ensure the accuracy of the stamping process.

[0029] Furthermore, compared to the original rear end wire feeding method of the eight-claw spring machine 1, this embodiment changes the wire feeding end 4 to the side. After the wire is fed horizontally from the left side wire feeding end 4, it first passes through the gap between the eccentric wheel 7 and the inner wall of the stamping groove 6, and then is sent out to the forming processing area through the front end of the main spindle 5. The outer circumferential surface of the eccentric wheel 7 and the end face of the abutment rod 19 together form the pre-positioning channel of the wire. When the wire passes through this channel, it will turn 90 degrees from the original path to form a bending angle. This bending angle can perform preliminary axial and radial positioning of the wire.

[0030] In addition, it should be specifically noted that, such as Figure 4 , Figure 5 and Figure 8 As shown, the wire bending and stamping operations are carried out continuously. In this device, after the wire passes through the stamping operation, it passes through the abutment rod 19. The previous safety hole 8 stamping completion section has been transferred to the next working position. It will be driven by the cutter on the upper left corner station to complete the bending, causing the wire to bend outward. Before stamping the new safety hole 8, the eccentric roller 7, together with the previously completed forming section, forms a continuous bending structure. Then, the stamping operation of the current working section is carried out to avoid large-scale movement of the wire during the stamping operation.

[0031] For example Figure 8As shown, after the stamping operation is completed, a complete safety hole 8 will be formed on the wire. Then, the next round of bending operation will continue. Finally, at the shearing station, the shearing blade will cut along the safety hole 8, which will automatically form two independent safety snap structures at both ends of the finished spring, completing the snap-fit ​​processing. The entire process is fully automated and does not require stamping operations. The stamping operation of the safety hole 8 is concentrated on an eight-claw spring machine 1, which effectively improves processing efficiency, reduces equipment investment costs, simplifies processing procedures, shortens processing cycle, and further avoids the accuracy error caused by manual positioning, which can stably ensure processing accuracy. This embodiment only shows one structure of the safety hole 8 of the finished spring. In other embodiments, according to the different structural design requirements of the finished spring, the stamping frequency and position can be adjusted, and the cutting tool can be changed at the same time to process safety holes 8 of corresponding sizes at different positions of the spring, making it more adaptable.

[0032] In this embodiment, as Figure 3 and Figure 6 As shown, two drive plates 13 are slidably connected to the top and bottom of the inner wall of the stamping groove 6, and a push plate 14 is installed on the upper and lower surfaces of the stamping cutter head 10 by bolts. The two drive plates 13 and the two push plates 14 are fixedly connected one-to-one. An eccentric rotating wheel 7 has a shaft 16 running through its interior. Two limiting rods 17 run through both ends of the shaft 16, and both limiting rods 17 are fixedly connected to the inner wall of the stamping groove 6. Both drive plates 13 are provided with guide grooves 15, and the two ends of the shaft 16 slide along the guide grooves 15 on the two drive plates 13 respectively. The front half of the guide groove 15 is set as an inclined section, and the rear half of the guide groove 15 is set as a straight section. When the stamping cutter head 10 moves gradually toward the stamping groove 6, the push plate 14 drives the two drive plates 13 to slide forward along the inner wall of the stamping groove 6, pre-expanding and attaching the wire to the inner side of the stamping groove 6 to prevent the wire from deforming and shifting. It should be noted that when the stamping cutter head 10 moves towards the stamping groove 6, the stamping cutter head 10 will simultaneously drive the two drive plates 13 to slide forward along the inner wall of the stamping groove 6 through the upper and lower push plates 14. At this time, the two ends of the shaft 16 will first move along the inclined section of the guide groove 15. As the drive plate 13 moves forward, the groove wall of the inclined section will push the shaft 16 to move outward along the preset transverse trajectory of the limit rod 17. By limiting the shaft 16 with the two limit rods 17, it is ensured that the shaft 16 can only move the eccentric wheel 7 laterally, and drive the eccentric wheel 7 to move away from the abutment rod 19. This will pre-spread the wire passing through the gap between the eccentric wheel 7 and the abutment rod 19 slightly outward, so that the wire is tightly attached to the inner side of the stamping groove 6, completing the pre-positioning before stamping and avoiding the wire from shifting and deforming during the subsequent stamping process.

[0033] When the shaft 16 enters the straight section of the latter half of the guide groove 15, the drive plate 13 continues to move forward, and the shaft 16 no longer undergoes lateral displacement. At this time, the position of the eccentric wheel 7 remains fixed, and the punching head 10 continues to feed to complete the punching operation. After the safety hole 8 is punched, the punching head 10 resets backward, and the two drive plates 13 move backward synchronously with the punching head 10. The shaft 16 retracts along the inclined section of the guide groove 15, and the eccentric wheel 7 returns to its initial position. The torsion spring 18 synchronously drives the eccentric wheel 7 to reset, making it convenient for the next section of wire to pass through the gap and wait for the next punching operation. The entire process is synchronously driven by the cam mechanism of the eight-claw spring machine 1. No additional power source is required, and no manual assistance is needed for positioning. It automatically completes the pre-expansion positioning and punching operation, with stable processing accuracy, which can effectively improve processing efficiency and the yield rate of spring products.

[0034] The two drive plates 13 move synchronously with the stamping cutter head 10, making the expansion and tensioning of the elastic wire intermittent. This operation is only activated during stamping, where the outer side of the wire abuts against the inner side of the stamping groove 6. During other cutter operations, there is a small gap between the wire and the inner side of the stamping groove 6. This small gap provides a "tolerance space," ensuring that the positioning force is applied only at the moment of punching. This preserves the original geometry and dimensional accuracy of the spring to the greatest extent, and allows the wire to pass smoothly during non-stamping stages. This significantly reduces ineffective friction and ensures smooth and stable wire feeding. The precise expansion at the moment of stamping balances the dual requirements of "smooth material feeding" and "no deviation during punching," thereby effectively protecting the positioning mandrel and improving the service life of the entire equipment.

[0035] In this embodiment, as Figure 7 As shown, two torsion springs 18 are respectively sleeved at both ends of the shaft 16. One end of the torsion spring 18 is fixedly connected to the outer wall of the shaft 16, and the other end of the torsion spring 18 is fixedly connected to the eccentric wheel 7. It should be noted that torsion springs 18 are installed at both ends of the shaft 16. The shaft 16 is restricted by the limiting rod 17 and can only slide linearly along the limiting rod 17. The eccentric wheel 7 is sleeved on the outside of the shaft 16. The angle of the eccentric wheel 7 is controlled by the torsion spring 18. In the initial state, the far end of the eccentric wheel 7 faces the bend, and the near end is on the other side and does not contact the wire. When the device adjusts the tension of the wire, the eccentric wheel 7 can use its own eccentric characteristics and the elasticity of the torsion spring 18 to achieve adaptive adjustment. This design ensures that the system always maintains a suitable preload, effectively avoiding the problem of insufficient tension or over-tensioning and jamming caused by slight tolerances in the wire diameter, and greatly improving the device's adaptability to wires of different specifications.

[0036] Specifically, after the outer circumference of the eccentric wheel 7 contacts the inner wall of the wire, as the shaft 16 expands outward, the eccentric wheel 7 moves outward synchronously. Under the frictional force of the inner wall of the wire, it rotates clockwise. If the wire's initial tension is high and the outward expansion resistance is high, the eccentric wheel 7 will rotate clockwise with a larger amplitude, and its effective outer diameter will decrease with rotation. This allows it to accommodate higher tensions and prevents excessive outward expansion that could break the wire. Conversely, if the wire's initial tension is low and the outward expansion resistance is low, the eccentric wheel 7 will rotate clockwise with a smaller amplitude, and its effective outer diameter will be larger. The eccentric wheel 7 can provide sufficient expansion force to tighten the wire. Under the action of the torsion spring 18, it can maintain elastic contact with the wire, avoiding the wire from being deformed due to rigid expansion of the eccentric wheel 7. At the same time, after the stamping is completed and the shaft 16 is reset, the torsion spring 18 can drive the eccentric wheel 7 to automatically rotate back to the initial angle. The torque parameter of the torsion spring 18 can be flexibly configured according to the wire specifications to ensure that its elastic potential energy is sufficient to maintain the initial deflection posture and effectively resist the conventional feed friction force, preventing the eccentric wheel 7 from rotating unexpectedly.

[0037] When used in conjunction with the shaft 16, the eccentric wheel 7 can be adjusted adaptively based on the tension of the wire itself. This prevents the positioning effect from being affected by minor production errors in the wire diameter, resulting in a higher overall tolerance and stronger adaptability. At the same time, the elastic contact will not cause rigid compression deformation to the wire, further ensuring the dimensional accuracy of the processed spring. The eccentric wheel 7 can be made of elastic silicone material, which can further buffer the impact of stamping and avoid scratching the inside of the wire.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fully automated precision spring-to-coil conversion machine, comprising an eight-claw spring machine, characterized in that: The eight-claw spring machine is provided with a positioning mandrel in the middle and eight sets of linear slide rails on the machine. Each linear slide rail is fixedly mounted with a cutter by a sliding block. The eight-claw spring machine is provided with a wire inlet on the left side. One of the sliding blocks is equipped with a stamping cutter, which is located on the side near the wire inlet. The positioning mandrel includes a main mandrel with a stamping groove inside. An eccentric wheel is installed inside the stamping groove. The stamping tool can stamp the wire to form a safety hole. The eccentric wheel can expand the wire outward during the stamping operation to stably engage it on the inner side of the stamping groove, thus preventing the wire from shifting or deforming during the stamping process.

2. The fully automated precision spring-to-coil conversion machine according to claim 1, characterized in that: The stamping tool includes a base fixedly connected to a sliding block, and a stamping head is fixedly connected to the inner side of the base. The stamping head is installed facing the stamping groove. The wire enters from the inlet end, passes through the gap between the eccentric wheel and the inner wall of the stamping groove, and is then fed outward. An abutment rod is fixedly connected to the inner wall of the stamping groove at a position away from the eccentric wheel.

3. The fully automated precision spring buckle conversion machine according to claim 1, characterized in that: Two sliding rods are slidably connected to the main spindle. One end of each sliding rod extends through the outside of the main spindle and is fixedly connected to the inner side of the base. Both sliding rods are fitted with buffer springs.

4. The fully automated precision spring buckle conversion machine according to claim 2, characterized in that: Two drive plates are slidably connected to the top and bottom of the inner wall of the stamping groove, and a push plate is installed on the upper and lower surfaces of the stamping cutter head by bolts. The two drive plates and the two push plates are fixedly connected in a one-to-one correspondence.

5. A fully automated precision spring snap-fit ​​machine according to claim 4, characterized in that: A shaft runs through the interior of the eccentric wheel, and two limiting rods run through both ends of the shaft, with both limiting rods fixedly connected to the inner wall of the stamping groove.

6. The fully automated precision spring buckle conversion machine according to claim 5, characterized in that: Both drive plates are provided with guide grooves, and the two ends of the shaft slide along the guide grooves on the two drive plates respectively; The first half of the guide groove is set as an inclined section, and the second half of the guide groove is set as a straight section.

7. A fully automated precision spring snap fastener machine according to claim 4, characterized in that: As the stamping cutter head moves progressively toward the stamping groove, the push plate drives two drive plates to slide forward along the inner wall of the stamping groove, pre-expanding and attaching the wire to the inner side of the stamping groove to prevent the wire from deforming and shifting.

8. A fully automated precision spring snap-locking machine according to claim 6, characterized in that: Two torsion springs are respectively sleeved at both ends of the shaft. One end of the torsion spring is fixedly connected to the outer wall of the shaft, and the other end of the torsion spring is fixedly connected to the eccentric wheel.

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