The invention relates to a large
diameter-thick ratio and
vertical distance ratio seal head rotary percussion forming device and a rotary percussion method thereof. The forming device comprises a
machine tool gantry formed by stand columns and a top beam, a base, a cross beam, double rotary wheel carriers, a rotating platform, a cylinder-shaped mould, a ring-shaped pressure plate fixture, and the like, wherein the rotating platform is arranged on the base of a
machine tool; the cylinder-shaped mould is arranged on the rotating platform; a workpiece to be processed is closely clamped on the cylinder-shaped mould, so that the workpiece and the mould can synchronously rotate along with the rotating platform; the two rotary wheel carriers are respectively arranged at the left side and right side of the cross beam, and each rotary wheel carrier is provided with a rotating wheel as a
spinning tool; the vertical-direction feed and the horizontal-direction feed of the rotating wheel are realized by a stepping motor and a screw rod. The double-rotating wheel structure is adopted, so that the stress stability of the workpiece can be improved in the
spinning forming process, and the influence of vibration to the
machining process can be reduced. According to the
spinning method, double rotating wheels are respectively used for feeding and extruding the workpiece so as to form the workpiece along the symmetrical arc shapes from the left side and right side of the periphery of the workpiece to the center. The device is simple, the
stamping of a drum roller is avoided, is stable in forming process, and is capable of avoiding the phenomenon of
instability in the forming process of a large
diameter-thick ratio and
vertical distance ratio seal head, thus realizing the whole precision shaping of the large
diameter-thick ratio and
vertical distance ratio seal head.