1. Bend the radius of the machined part. When forming the spring sheet, most of them need to be bent. If the radius of curvature of the bending part is relatively small, these parts will produce large stress. Therefore, in order to avoid large stress in the bending part, the bending radius should be at least five times of the plate thickness.
2. Stress concentration at notch or hole. Spring sheets often have stepped parts and openings, and stress concentration will occur at the step where the size changes sharply. The smaller the hole diameter, the larger the plate width, the greater the stress concentration factor.
3. Shape and dimensional tolerance of spring plate. Sheet springs are mostly used for stamping. When designing, it is necessary to consider the shape and size suitable for stamping. At the same time, it is also necessary to fully consider the dimensional tolerance such as springback during bending and deformation during heat treatment.
The requirements for heat treatment of spring leaf should be put forward according to the performance requirements. The hardness after heat treatment can generally be determined between 36 and 52HRC.