Abstract
The extreme surface expansion and pressures observed during the backward cup extrusion process can adversely affect the surface of the work-piece and diminish the life of the punches. To reduce or eliminate punch ejection load and galling commonly encountered in the backward extrusion process, a punch system composed of a main body punch and a punch nose insert is proposed. The nose insert is both an elastic strain field generator to facilitate punch removal and a gateway for lubricant transport. The preliminary test results have shown a marked reduction in both galling and the load required to eject the punch.
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