METHOD FOR HOT STAMPING LARGE THICK OIL-GAS-WATER HEAT-SHUNT CONNECTIONS OF STEEL BY EXTRUSION offshoot INSIDE OR rolled round billet SHELL AND SYSTEM FOR CARRYING OUT THE METHOD

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to metal forming and may be used for forging large-sized thick-wall steel tees. Tube billet with pre-bored temporary hole is placed in extrusion zone. Said billet is fitted on the support with male die arranged thereat. Then, the billet is displaced in heating zone for local heating of the area around said temporary hole. Heated billet is placed in extrusion zone to form the branch pipe. For this said male die is pushed from inside of tube billet outside via said temporary hole. Male die push force is directed from inside of the billet at resting on billet inner cold surface.;EFFECT: larger forging forces, lower costs.;13 cl, 10 dwg