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Plunge Swaging Method:
In addition to the radial oscillations, the dies perform a larger radial closing and opening movement. The workpiece is typically fed into the axial working position with fully opened dies. Then the plunging movement of the dies is effected and the forming operation is executed. Considerably steeper taper angles than are possible by infeed swaging can be produced by plunge swaging. The maximum achievable taper angle is limited by the axial flow of the material during forming. The plunging method also permits reductions between the workpiece ends. The forming energy is concentrated in the tapered and in the cylindrical areas. The plunging method generally requires more energy than infeed swaging. The length of the forming area is limited to the length of the dies or to the forming energy which the machine can provide if pure plunge swaging is used. All plunge swaging machines may also be used as axial infeed swaging machines if the strikers and dies remain closed.
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