The present invention discloses a
necking tooling for the rubber main spring of a hydraulic
bushing, which includes a base, a positioning pin, a lower pressing block, a twelve-
petal die, a pressing plate, a tapered cover, an upper pressing block and an upper cover plate. The twelve-
petal die is arranged at the top end of the base. The tapered cover is in a conical shape with a smaller upper part and a larger lower part. The lower opening of the tapered cover is sleeved on the twelve-
petal die, and an adjusting plate is arranged between the lower end of the tapered cover and the upper end of the positioning edge of the twelve-petal die. The upper pressing block is arranged in the upper opening of the tapered cover. The upper cover plate is connected to the top end of the tapered cover by bolts. An adjusting piece is arranged between the bottom end of the upper cover plate and the top end of the upper pressing block. This
necking tooling has a limiting mechanism at both ends and the middle of the rubber main spring, can realize the
necking process of the rubber main spring with an inner cage having a window, and after necking, the window end face and the middle part have no deformation, the necking amount and the preloading amount can be adjusted, and the operation is convenient. The present invention also discloses a necking method for the necking tooling of the rubber main spring of a hydraulic
bushing.