METAL EXTRUSION PROCESS Russian patent published in 2006 - IPC B21C23/22 

FIELD: plastic working of metals, namely processes for producing semi-finished products by extrusion.

SUBSTANCE: process comprises step of placing blank in container of press, creating in it compression stresses sufficient for pressing out metal through die hole; pressing out metal from die hole at applying tension to extruded part of product; placing in front of blank additional pad made of metal whose deformation resistance is no less than 1.1 of tension stress value and is no more than 0.9 of deformation resistance value of blank metal at temperature and rate of extrusion process. At extrusion welding mode of metals of blank and additional pad is achieved. Volume of said pad is determined according to given relation: V_m = l_bl x F₁ where l_bl -length of extruded part of blank sufficient for creating tension; F₁ - cross section area of extruded part of blank. Tension is applied after pressing out pad metal to extruded part of blank formed of metal of said pad.

EFFECT: lowered peak load of press drive, reduced nominal effort of press.

2 cl, 2 ex, 4 dwg