Shot blasting method suitable for few variable cross-section plate springs

The invention discloses a shot blasting method suitable for few variable cross-section plate springs, which comprises the following steps: step 1, after the plate springs are subjected to heat treatment, the hardness of a plate spring base body is subjected to spot check, and the spot check frequency is 50 pieces per time; secondly, the plate spring subjected to heat treatment is subjected to common powerful shot blasting; the diameter of the shot of the shot blasting is 1.2 mm to 1.5 mm; thirdly, stress is applied to the plate spring subjected to common strong shot blasting through the tool clamp, and stress shot blasting is conducted; the shot diameter of the stress shot blasting is 0.5 mm-0. 8mm, and the temperature of the plate spring is 120 DEG C-180 DEG C during the stress shot blasting; and fourthly, electrophoresis and assembling are conducted on the plate spring after shot blasting. According to the heat treatment condition of the plate spring, common strong shot blasting and stress shot blasting are