The compression spring is a kind of hardware fitting with spiral geometry formed by wire, so it is more difficult to stiffen and strengthen it than planar hardware fittings (such as stamping parts). In addition, the stiffening effect of the cross-section of the compression spring must be strictly controlled, so as to fully understand the resistance of the compression spring to fatigue fracture after use.
Generally, the pressure spring is hardened by shot peening and heat treatment.
Shot blasting and hard pressure spring treatment: to treat a batch of pressure springs, the pressure springs can be transported to the shot blasting chamber by a separate conveyor belt. There is a group of parallel roller paths in the shot blasting City, and the roller rolls to roll while strengthening, driving the pressure spring edge to rotate forward. Such rotation can allow the high-speed shot flow to pass through the middle of each coil of the pressure spring and hit the metal surface of the inner ring, which is exactly where the pressure spring stress Z is concentrated, Shot peening is a good strengthening means for suspension spring Z. after proper shot peening, the fatigue life of high stress spring can be increased by more than 4 times.
