PRESSURE PLATE Russian patent published in 2013 - IPC B21C25/00 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may in production of axially symmetric billets. Pressure plate has central cavity made in its body on working end side shaped to conical recess with taper angle α=1-5° its smaller base located on pressure plate working face side. Truncated cone smaller base area is defined by the equation $$S=\frac{\pi {(d_{\text{cir}\text{.circle}}+(1-5))}^2}{4},$$ where d_cir.circle is the diameter of circle circumscribing section cross-section.

EFFECT: ruled out funnel, reduced butt-end.

1 dwg