Leaf Spring for HINO

Leaf Spring for HINO

Leaf Spring for HINO is also called blade springs.

A long time ago, after a leaf spring for cars was heat-treated, craftsmen would constantly hit it with hammers. At the time, the craftsmen did not know that the result of this would extend the service life of leaf springs by a factor of six. Now, engineers have learned about this fact.

This strengthening technique is also suitable for cylindrical coil springs (round springs) and torsion bars, aiming to improve the fatigue strength and stress corrosion rupture strength of the spring to varying degrees. Some other aircraft and automotive parts, such as connecting rods, crankshafts, rocker arms, planetary gears, ring gears, aero-engine blades, landing gear and propeller shafts, have strengthened processes as a necessary step in the production process and have developed strict technical specifications.

The strengthening process uses the impact of high-speed projectile flow on the metal surface to generate a cyclic plastic strain layer on the surface, which leads to favorable changes in the microstructure of the layer and introduces the residual compressive stress field to the surface. The microstructure of the surface layer and the residual compressive stress field are two strengthening factors to improve the fatigue fracture and stress corrosion fracture resistance of metal materials and their springs, thereby improving the reliability and durability of springs.