Coil spring and leaf spring shot peening

CYM Materiales designs and manufactures custom-engineered shot peening machines for coil springs and leaf springs, developed to meet the specific requirements of each project. Unlike conventional shot blasting, shot peening is a controlled process of inducing compressive residual stresses on the surface of elastic components, with the goal of significantly increasing fatigue resistance and service life.

The coil spring shot peening machine processes automotive, railway and agricultural suspension springs in a continuous process: springs advance on parallel rollers that simultaneously spin each spring on its own axis while feeding it forward, ensuring uniform 360° coverage across the entire coil surface in a single pass. The pusher chain with variable frequency drive allows precise regulation of feed speed and, with it, the peening intensity.

For leaf springs, CYM Materiales offers two variants depending on the required process: the shot peening machine with rubber belt conveyor for unloaded leaf springs, and the stress peening machine — shot peening under tension — which is the automotive and railway industry standard for high-demand suspension components. In stress peening, leaf springs are mounted in tensioning fixtures under hydraulic load reproducing in-service conditions during blasting, maximizing the compressive residual stresses induced in critical zones.