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How to test the service life of compression springs | compressione spring
06 Dec 2021

One sample selection      When preparing samples, care should be taken to eliminate some abnormal factors that affect fatigue strength. There are two types of factors that affect the spring fatigue strength test: one is internal factors, such as chemical composition, metallographic structure, etc.; the other is external factors, such as surface condition, shape and size, temperature, surrounding medium, etc. Generally, it is based on the inherent fatigue strength of the material (internal factors), and the external factors are considered for correction. Therefore, in the test process, the test piece should try to eliminate the influence of external factors. When conducting the first type of test, samples can be prepared according to the conditions of use, or samples can be taken directly from the product. The second and third types of tests should be sampled according to specific requirements.     A. Specimen size The spring size is always different, so even under the same amount of deformation, the stress and fatigue strength between them are not exactly the same. In order to accurately reflect the fatigue strength of the sample, the measurement accuracy of the size should be improved on the basis of reducing the size error.      1) The measurement accuracy of the sample size should be greater than 0.5%. When the material size is less than 2 mm, its accuracy should be 0.01 mm. If 0.5% of the sample size is less than 0.01mm, the accuracy is 0.01mm.     2) When measuring the size of a circular cross-section (such as outer diameter D2, spring wire diameter d), two diameters perpendicular to each other on the same cross-section should be measured, and the average value should be used as the diameter.     3) According to the spring shear stress calculation formula:      It can be seen that in order to reflect the maximum shear stress, the maximum value of spring D/D should be measured.     B. Sample shape     1) In order to ensure that the spring does not produce eccentric load after being stressed, the parallelism of the two ends of the spring and the perpendicularity of the whole spring should be strictly checked.

What is the difference between left and right rotation of a torsion spring | torque force coil springs
06 Dec 2021

1. As a compression spring or tension spring There is no difference in function between left-handed spring and right-handed spring when used as tension and compression springs, but the right-handed spring is the main application. 2. As a torsion spring 1. Left-handed spring: The torsion force of the left-handed spring acts on the left-handed rotation, so it can only be used where the left-handed force is needed during application. 2. Right-handed spring: The torsion force of the right-handed spring is to rotate to the right, and the applicable range can only be the position that needs to be rotated to the right. Three, spiral spring The left-handed spring and the right-handed spring are just accumulators. They have the function of storing energy, but they cannot release the energy slowly. To realize the function of releasing slowly, it should be realized by the "spring + large transmission ratio mechanism". Classification of coil springs: 1. According to the different characteristics of the load during work, the spiral spring can be divided into three types: compression, tension and torsion; 2. According to the structural characteristics, it can be divided into two categories: cylindrical spiral spring and variable diameter spiral spring; variable diameter spiral spring mainly bears compression load; 3. According to its shape characteristics, it can be divided into cone, scroll, concave and convex. 4. In production and use, coil springs can also be divided into two types according to the forming method and material diameter: large coil springs and small coil springs; the former is usually hot-formed, and the latter is cold-formed. 5. In other categories, there are many types of spiral springs, which can be divided into: ordinary cylindrical spiral springs; variable diameter spiral springs. According to the direction of the helix, it can be divided into: left-handed spring; right-handed spring. 6. Variable diameter spiral springs are divided into: conical spiral springs, scroll spiral springs, and concave spiral springs. 7. Cylindrical spiral spring, simple structure, convenient manufacturing, and the most widely used. Its characte

What materials are generally available for springs? | torsion spring parts
16 Nov 2021

Spring steel belongs to steel for mechanical structure; according to its quality grade, it belongs to special quality steel, that is, steel that requires strict quality and performance control during the production process. Classified according to chemical composition: 1. Carbon spring steel. 2. Alloy spring steel. 1. Carbon spring steel: mostly used materials: 65#, 70#, 65mn, 82b, 72a, 72b steel wire, characterized by low plasticity, strong elasticity, and strong stress resistance. Uses: mostly used in Simmons beds, automobiles and other Kinds of cushions, machinery manufacturing, stationery, power tools, sports equipment, torsion springs, tension springs, electrical equipment and other industries. Specification range: wire diameter φ0.20mm-φ6.50mm. Standard: carbon spring steel wire national standard gb4357-89 Main purpose: used to manufacture springs that are wound and formed in a cold state without being quenched 2. Alloy spring steel: Alloy spring steel is a type of steel used to make springs or other elastic parts. Springs generally work under alternating stress, and the common form of failure is fatigue failure. Therefore, alloy spring steel must have a high yield point and yield ratio (σs/σb), elastic limit, and fatigue resistance to ensure that the spring has Sufficient elastic deformation capacity and able to withstand larger loads. At the same time, alloy spring steel is also required to have a certain degree of plasticity and toughness, a certain degree of hardenability, not easy to decarburize and not easy to overheat. Some special springs also require heat resistance, corrosion resistance or stable elasticity over a long period of time. Both medium carbon steel and high carbon steel can be used as springs, but because of their low hardenability and strength, they can only be used to make springs with smaller cross-sections and smaller forces. Alloy spring steel can produce important springs with larger cross-sections and higher yield limits. In some occasions with specific requirements, such as high pH and humid environments, we often use stainless steel materials to make springs. The material of the mould spring is generally chromium alloy s