Press roll piercing method

Details Press roll piercing method Press roll piercing method

1978-02-15

1980-02-26

Ruggiero, Joseph F.

Boots, shoes, and leggings

72 8, 72209, 364474, G06F 1546, B21B 3700

Patent

active

041908872

ABSTRACT:
A press roll piercing method wherein a polygonal billet is pushed in the axial direction thereof between a pair of driven rolling rolls mounted one above the other and a piercing plug is supported in the center of the pass by a mandrel, is improved by selecting a pushing force of a predetermined value which corresponds to a stress above the yield stress of the billet at the starting of the piercing although the actual stress occurring at the starting of the piercing may or may not exceed the yield stress by selecting the pushing speed and/or the peripheral speed of the rolls such that the volume of the billet pushed in per unit time and the volume of the hollow shell discharged from the rolling rolls become substantially equal, whereby the billet is positively gripped by the rolling rolls.

REFERENCES:
patent: 3864951 (1975-02-01), Gulyaev et al.
patent: 3931724 (1976-01-01), Berdyansky et al.

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