FIELD: metallurgy.
SUBSTANCE: preliminary thinning of a flat initial blank by turning is carried out, heating the blank and placing it in a heated die and forming a cup by a conical press to form an equithickness flange and drawing of produced cup by cold punch in heated die in part of hemispherical shape in die with different gaps between the conical press and the die, and the die and the punch. In this case, the preliminary thinning of the initial blank is carried out to a certain thickness in the flange zone formed by the conical press.
EFFECT: minimum thinning of the bottom of the hemisphere.
2 dwg
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