SUS301 steel strip for high-hardness and high-precision vortex spring

Abstract

The utility model relates to metal material structure design field discloses a kind of SUS301 steel belt for high-hardness high-precision scroll spring, including steel belt, steel belt includes upper surface layer, and steel belt is fixedly connected in composite corrosion-resistant layer, the bottom end surface of upper surface layer is fixedly connected with transition layer one, the bottom end surface of transition layer one is fixedly connected with core portion, the bottom end surface of core portion is fixedly connected with transition layer two, and the inside of core portion is provided with stress release groove along length direction, and the inner wall of stress release groove is fixedly connected with elastic ceramic particle;The bottom end surface of transition layer two is fixedly connected with lower surface layer.In the utility model, full-hard upper surface layer, lower surface layer and low-deformation core portion cooperate, meet high-hardness and high-precision requirement, semi-hard transition layer further optimizes overall performance, and is suitable for high-precision and high-hardness scene such as scroll spring.

Description

Technical Field

[0001] This utility model relates to the field of metal material structure design, and in particular to a SUS301 steel strip for high-hardness and high-precision vortex springs. Background Technology

[0002] A spiral spring is a planar helical spring that stores and releases energy through the elastic deformation of the material. It can store a significant amount of energy within a relatively small volume by winding multiple turns, providing stable torque. Its main functions include shock absorption, cushioning, power delivery, and auxiliary storage. Spiral springs are typically made of SUS301 stainless steel.

[0003] Ordinary SUS301 stainless steel strip achieves high hardness primarily through cold work hardening to form a high proportion of martensite phase, with a martensite phase ratio exceeding 80% in the fully hardened state. This results in severe lattice distortion and a significant decrease in grain boundary slip capability at low temperatures. Under load, the spiral spring is highly susceptible to crack propagation, leading to the failure of critical components, equipment malfunctions, and even safety accidents. Furthermore, cold work hardening easily causes stress relaxation, resulting in dimensional drift in critical dimensions such as the spiral spring's inner diameter and thickness, severely impacting the overall performance of the equipment.

[0004] To address this issue, a high-hardness, high-precision SUS301 steel strip for spiral springs is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a high-hardness, high-precision SUS301 steel strip for spiral springs, aiming to improve the problems of mismatch in properties and dimensional drift of fully hardened martensitic structures in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-hardness, high-precision SUS301 steel strip for spiral springs, comprising a steel strip, characterized in that: the steel strip includes an upper surface layer, and the steel strip is fixedly connected to a composite corrosion-resistant layer; a transition layer one is fixedly connected to the bottom end face of the upper surface layer; a core is fixedly connected to the bottom end face of the transition layer one; a transition layer two is fixedly connected to the bottom end face of the core; and a stress-relieving groove is formed along the length direction inside the core, and elastic ceramic particles are fixedly connected to the inner wall of the stress-relieving groove; a lower surface layer is fixedly connected to the bottom end face of the transition layer two.

[0007] Preferably, the composite corrosion-resistant layer is a 316 stainless steel composite corrosion-resistant layer, and the edges of the composite corrosion-resistant layer are provided with rounded chamfers.

[0008] Preferably, the upper surface layer is a fully hardened SUS301 upper surface layer, and the thickness of the upper surface layer is 0.01-0.03mm.

[0009] Preferably, the first transition layer is a semi-hard SUS301 transition layer, and the thickness of the first transition layer is 0.05-0.1 mm.

[0010] Preferably, the core is a low-deformation SUS301 core, and the core accounts for 70-80% of the total thickness of the steel strip.

[0011] Preferably, the stress relief groove has a width of 0.1-0.2 mm, a depth of 0.05-0.1 mm, and a groove spacing of 5-10 mm between adjacent stress relief grooves.

[0012] Preferably, the elastic ceramic particles are zirconium dioxide elastic ceramic particles, and the diameter of the elastic ceramic particles 8 is 0.01-0.02 mm.

[0013] Preferably, the second transition layer is exactly the same as the first transition layer; the lower surface layer is exactly the same as the upper surface layer.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the fully hardened upper and lower surface layers cooperate with the low-deformation core to meet the requirements of high hardness and high precision. The semi-hardened transition layer further optimizes the overall performance and is suitable for scenarios with high precision and hardness requirements, such as spiral springs.

[0016] 2. In this invention, the pitting potential of the 316 stainless steel layer is increased by 0.2-0.3V compared to SUS301, and the corrosion resistance after scratching is improved by 3-5 times. The stress relief grooves and elastic ceramic particles in the core effectively disperse stress, improving the fatigue resistance of the steel strip during stress and its dimensional stability during use. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a high-hardness, high-precision spiral spring made of SUS301 steel strip.

[0018] Figure 2 This is a partial cross-sectional view of a high-hardness, high-precision spiral spring made of SUS301 steel strip, as proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of the core structure of a high-hardness, high-precision spiral spring made of SUS301 steel strip.

[0020] Figure 4 An exploded view of a high-hardness, high-precision spiral spring made of SUS301 steel strip proposed in this utility model.

[0021] Legend:

[0022] 1-Core; 2-Transition layer one; 3-Transition layer two; 4-Upper surface layer; 5-Lower surface layer; 6-Composite corrosion-resistant layer; 7-Stress relief groove; 8-Elastic ceramic particles; 9-Steel strip. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figures 1 to 4 In one embodiment of this utility model, the steel strip 9 has an overall structure composed of a ladder-shaped multi-layered composite structure. The top layer is an upper surface layer 4. A transition layer 2 is fixed to the bottom surface of the upper surface layer 4. A core 1 is fixed to the bottom surface of the transition layer 1. A second transition layer 3 is fixed to the bottom surface of the core 1. A lower surface layer 5 is fixed to the bottom surface of the second transition layer. The upper surface layer 4, the first transition layer 2, the core 1, the second transition layer 3, and the lower surface layer 5 are all fixedly connected by metallurgical bonding. The steel strip 9 is fixedly connected to the composite corrosion-resistant layer 6 by vacuum welding. Stress relief grooves 7 are formed along the length direction inside the core 1.

[0025] The composite corrosion-resistant layer 6 is made of 316 stainless steel, which has excellent corrosion resistance and significantly enhances the corrosion resistance of the steel strip 9, enabling it to work stably in corrosive environments such as humidity, acid and alkali, and avoids the steel strip's performance degradation or failure due to corrosion. This broadens the application scenarios of the steel strip 9. In addition, the edges of the composite corrosion-resistant layer 6 are processed with rounded chamfers. This design is to avoid edge stress concentration and enhance safety during use.

[0026] The upper layer 4 is made of fully hardened SUS301 stainless steel. The fully hardened nature of the upper layer 4 gives it high hardness and strength, effectively resisting external wear and deformation. Its thickness is controlled within the range of 0.01-0.03mm to ensure the good performance of the upper layer 4.

[0027] The transition layer 2 is made of semi-hardened SUS301 stainless steel. Its semi-hardened properties help to alleviate stress concentration caused by the performance difference between the upper surface layer 4 and the core 1 when connecting the upper surface layer 4 and the core 1. Its thickness is set to 0.05-0.1mm to meet the requirements of connection strength and structural stability.

[0028] The second transition layer 3 is exactly the same as the first transition layer 2, and the lower surface layer 5 is exactly the same as the upper surface layer 4, which ensures the symmetry of the upper and lower structures of the steel strip 9 and the consistency of its performance, thereby enhancing the stability and performance of the overall structure.

[0029] The core 1 is made of low-deformation SUS301 stainless steel. The low-deformation characteristic ensures that the steel strip 9 is not easily deformed during use and can maintain good dimensional stability. Moreover, the core 1 accounts for 70-80% of the total thickness of the steel strip 9 and bears the main load of the spiral spring during use. It provides basic strength and toughness to the steel strip 9, effectively reduces the risk of failure caused by local stress concentration, and ensures the overall stability and service life of the spiral spring.

[0030] The stress relief groove 7 has a width of 0.1-0.2 mm and a depth of 0.05-0.1 mm. The groove spacing between adjacent stress relief grooves 7 is 5-10 mm. This design allows the stress relief grooves 7 to be evenly distributed inside the core 1, maximizing their stress relief effect.

[0031] The stress relief groove 7 is filled with elastic ceramic particles 8 that are fixedly connected to the inner wall of the stress relief groove 7; the elastic ceramic particles 8 are zirconia elastic ceramic particles with a diameter of 0.01-0.02 mm; these particles have excellent elasticity and wear resistance, effectively absorbing the internal stress generated in the core 1 during the stress process, and further improving the machinability and dimensional stability.

[0032] Working Principle: The core support of the steel strip 9 is the core 1. The core 1 is connected to the upper surface layer 4 and the lower surface layer 5 through transition layers 1 and 2 respectively. The layers are metallurgically bonded to ensure a stable connection, forming an integral load-bearing structure. The stress relief groove 7 inside the core 1 works in conjunction with the elastic ceramic particles 8 to change the stress distribution, dispersing concentrated stress to the surrounding area of ​​the groove and transferring some energy to the elastic ceramic particles 8, effectively reducing local stress peaks. The outer composite corrosion-resistant layer 6 is formed by vacuum welding to reduce the impact of external corrosion on the steel strip 9. The specific materials and structural design of each layer together ensure the hardness, precision, and stability of the steel strip 9.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A high-hardness, high-precision SUS301 steel strip for spiral springs, comprising a steel strip (9), characterized in that: The steel strip (9) includes an upper surface layer (4) and is fixedly connected to the composite corrosion-resistant layer (6); a transition layer (2) is fixedly connected to the bottom end face of the upper surface layer (4), a core (1) is fixedly connected to the bottom end face of the transition layer (2), a transition layer (3) is fixedly connected to the bottom end face of the core (1), and a stress relief groove (7) is provided inside the core (1) along the length direction, and elastic ceramic particles (8) are fixedly connected to the inner wall of the stress relief groove (7); a lower surface layer (5) is fixedly connected to the bottom end face of the transition layer (3).

2. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The composite corrosion-resistant layer (6) is a 316 stainless steel composite corrosion-resistant layer (6), and the edge of the composite corrosion-resistant layer (6) is provided with a rounded chamfer.

3. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The upper surface layer (4) is a fully hardened SUS301 upper surface layer, and the thickness of the upper surface layer (4) is 0.01-0.03mm.

4. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The transition layer 1 (2) is a semi-hard SUS301 transition layer, and the thickness of the transition layer 1 (2) is 0.05-0.1mm.

5. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The core (1) is a low-deformation SUS301 core, and the core (1) accounts for 70-80% of the total thickness of the steel strip (9).

6. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The stress relief groove (7) has a width of 0.1-0.2 mm and a depth of 0.05-0.1 mm, and the groove spacing between adjacent stress relief grooves (7) is 5-10 mm.

7. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The elastic ceramic particles (8) are zirconium dioxide elastic ceramic particles, and the diameter of the elastic ceramic particles (8) is 0.01-0.02 mm.

8. The SUS301 steel strip for high-hardness and high-precision spiral springs according to claim 1, characterized in that: The second transition layer (3) is exactly the same as the first transition layer (2); the lower surface layer (5) is exactly the same as the upper surface layer (4).

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