公开(公告)号：EP0296178A4

公开(公告)日：1990-11-28

申请号：EP87905417

申请日：1987-03-04

Applicant: STEWART, CHARLES L.

Inventor： STEWART, CHARLES L.

IPC: B21C23/00 ,  B21C23/21 ,  B21C25/00 ,  B21C33/00 ,  B21C35/04 ,  B21C35/06

CPC classification number: B21C35/04 ,  B21C23/214 ,  B21C23/218 ,  B21C33/00

Abstract: An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet (25). A press container (21A) is mounted to be substantially axially stationary during extrusion of a billet. A hot biller (25), a die (27) and a pressure disc (29) are loaded into the axial throughbore (24) of the container (21A) so that the billet is sandwiched between the die (27) and pressure disc (29), with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore (24) to define a diametrical clearance (55 and 57) between the pressure disc and the press container. A bolster (31) is located adjacent the pressure disc (29) and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster (31) exerts a relatively insignificant axial force against the container (21A). An elongated stem (17) having an axial passage is moved into the throughbore of the container to press the die toward the bolster, causing the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage (19) in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.