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Round springs, due to their helical geometry, are harder to reinforce than planar springs. In addition, we must strictly assess the cross-section of the strengthening effect of circular spring, so as to fully understand the resistance of circular spring anti-fatigue fracture size.
Round spring was a separate one by a continuous conveyor chain system into the shot blasting room, shot blasting room with a set of parallel roller, while strengthening the roller kept rolling to drive round spring side of the line before the rotation. This way through the rotation allows high-speed pellet flow through the circular spring between the rings, hit the metal surface of the ring, where it is precisely the most stressful parts of the round spring stress.
For high capacity applications, you can choose a can spray two rounds of strengthening equipment. The results of the development are based on the original shot-blasting equipment, combined with multiple nozzles, for shot-peening with a more targeted, fire-concentrated focus on specific areas of the spring (stress concentration). Plate Spring Reinforcement A continuous through-type shot peening device can be used to reinforce leaf springs one after the other so that the geometric concave surface of the leaf spring is exposed to high velocity pellet flow. Typical models include a cast head for the top of the ejector spring, a side mounted a cast head, while spraying plate spring left and right side.
The standard plate spring fortification equipment through the speed of 10 feet / minute, such as the need for higher production speed, you can increase the number of head, adjust the motor frequency. Under operating conditions, the leaf springs are repeatedly subjected to uniaxial bending stresses, and are therefore sometimes stress-hardened. During the strengthening process, the simulated leaf spring is subjected to "stress hardening" during subsequent use, allowing it to be shot peened while applying a "static stress" in the direction of the load. Upon completion of the strengthening, the applied static stress is released. Experiments show that the stress strengthened than the conventional strengthening can further extend the service life of the leaf spring.
Suspension spring due to high-stress lightweight design, in recent years greatly reduce the weight of the suspension spring, the new model suspension spring stress> 1000Mpa very common. Springs in such high stress service, has exceeded the material can withstand the limit, it must be supplemented by other means of strengthening (such as throwing / shot peening).
Host manufacturers of automotive suspension springs using very stringent test standards, the longest one test cycle up to 70 days (10 weeks), which should be in the high stress conditions of the suspension spring, once the surface by stress corrosion That is, failure to produce corrosion fatigue, fracture after the spring port if the tire will be likely to puncture a significant safety and personal injury.
Shot / shot peening is the most effective means of strengthening the suspension spring, high-stress spring after appropriate shot peening fatigue life can be increased more than 5 times, the suspension spring throwing / shot pills are mostly steel wire cut, Shot peening (different pellet diameters) is commonly used. The compressive stress intensity and depth of spring surface are important indexes to measure shot peening effect. Good peening surface stress at least -600Mpa above 50um from the surface can reach-800Mpa, stress peening spring surface compressive stress of up to -800Mpa above 50um from the surface can reach-1200Mpa.
