Patent ID: 9700925
Date: 2017-07-11
CPC Classifications: B21C

Claim:
1. A hydrostatic backward extrusion system comprising: a container; a fixed-punch arranged inside the container, and wherein the fixed punch comprises a billet chamber to house a billet material, and wherein the fixed-punch is placed inside the container to form a gap between the fixed-punch and the container to form a die located on an outside of the fixed punch between the fixed-punch and the container, and wherein the billet material in the billet chamber is surrounded by a fluid; a plunger, and wherein the plunger is placed at a top of the billet chamber, wherein the plunger is configured to move into the billet chamber to extrude the billet material through the die; a first sealing location provided between the plunger and the fixed-punch to prevent a leakage of the fluid from the billet chamber, and wherein a diameter of the billet chamber in the first sealing location is larger than a diameter of the billet material; a second sealing location arranged at a bottom of the fixed-punch between the billet material and the surrounding fluid to prevent a leakage of the fluid during an extrusion process, and wherein a diameter of the billet chamber in the second sealing location is smaller than the diameter of the billet material.