We are offering automobile leaf springs.Leaf spring manufacturing process: 1.cutting of flat bar 2.center hole punching drilling3.end heating process forming (hot & cold process)4.heat treatment(1).heating(2).camber forming (3).quenching (4).tempering 5.surface preparation (1).shot peening stress peening(2).painting 6.assemble (1).presetting & load testing (2).paint touch-up (3).marking & packing.