High pressure billet extruder

Claim 2

Apparatus for extruding a billet, said apparatus comprising: a. an extrusion chamber adapted to receive said billet and extrusion medium; b. a jacket chamber surrounding said extrusion chamber and adapted to receive hydraulic fluid to provide external support to said extrusion chamber against internal pressure developed therein; c. pressurizing means communicating with said jacket chamber and adapted to pressurize the hydraulic fluid therein; d. first means connected to said pressurizing means and adapted to operate said pressurizing means to pressurize the hydraulic fluid in said jacket chamber to a first level; e. a die; f. second means connected to said pressurizing means and adapted to pressurize said extrusion medium and extrude said billet through said die and simultaneously to operate said pressurizing device to increase the pressure of the hydraulic fluid in said jacket chamber from said first level to a second level sufficient to externally support said extrusion chamber against internal pressure developed therein.

Claim 3

Apparatus as in claim 1, wherein: g. said first means comprises hydraulic ram means operatively connected at one end to said extrusion chamber.

Claim 4

Apparatus for extruding a billet, said apparatus comprising: a. an extrusion chamber adapted to receive said billet and extrusion medium; b. a jacket chamber surrounding said extrusion chamber and adapted to receive hydraulic fluid to provide external support to said extrusion chamber against internal pressure dei0hssn c. pressurizing means including piston means communicating with said jacket chamber and adapted to pressurize the hydraulic fluid therein upon advancement of said piston means; d. first means connected to said piston means and adapted to advance said piston means to pressurize the hydraulic fluid in said jacket chamber to a first level; e. a die; f. second means connected to said piston means and operatively interposed between said piston means and said die, said second means being adapted to advance said die into said extrusion chamber and against said billet to pressurize said extrusion medium and extrude said billet through said die and simultaneously to further advance said piston means to increase the pressure of the hydraulic fluid in said jacket chamber from said first level to a second level sufficient to externally support said extrusion chamber against internal pressure developed therein.

Claim 5

Apparatus for extruding a billet, said apparatus comprising: a. an extrusion chamber adapted to receive said billet and extrusion medium; b. a jacket chamber surrounding said extrusion chamber and adapted to receive hydraulic fluid to provide external support to said extrusion chamber against internal pressure dei0hssn c. pressurizing means including piston means communicating with said jacket chamber and adapted to pressurize the hydraulic fluid therein upon advancement of said piston means; d. first means connected to said piston means and adapted to advance said piston means to pressurize the hydraulic fluid in said jacket chamber to a first level; e. a die; f. second means connected to said piston means and operatively interposed between said piston means and said die, said second means being adapted to advance said die into said extrusion chamber and against said billet to pressurize said extrusion medium and extrude said billet through said die and simultaneously to further advance said piston means to increase the pressure of the hydraulic fluid in said jacket chamber from said first level to a second level sufficient to externally support said extrusion chamber against internal pressure developed therein.

Claim 6

Apparatus as in claim 3, wherein: g. said first means comprises hydraulic ram means operatively connected at one end to said extrusion chamber.

Claim 7

Apparatus for extruding a billet, said apparatus comprising: a. a pressure vessel having: i. an extrusion chamber therein adapted to receive said billet and extrusion medium; ii. a jacket chamber surrounding said extrusion chamber and adapted to receive hydraulic fluid to provide external support to said extrusion chamber against internal pressure developed therein; iii. a pressurizing cylinder communicating with said jacket chamber and adapted to receive hydraulic fluid; b. a piston slidably mounted within said pressurizing cylinder; c. first hydraulic ram means connected at one end to said pressure vessel and connected at the other end to said piston and adapted to advance said piston within said pressurizing cylinder to pressurize the hydraulic fluid in said jacket chamber to a first level; d. a die ram; e. a die mounted on said die ram; f. second hydraulic ram means connected at one end to said die ram and connected at the other end to said piston and adapted to advance said die ram and said die into said extrusion chamber and against said billet to pressurize said extrusion medium and extrude said billet through said die and simultaneously to further advance said piston within said pressurizing cylinder to increase the pressure of the hydraulic fluid in said jacket chamber from said first level to a second level sufficient to externally support said extrusion chamber against internal pressure developed therein.

Claim 8

Apparatus for extruding a billet, said apparatus comprising: a. a pressure vessel having: i. an extrusion chamber therein adapted to receive said billet and extrusion medium; ii. a jacket chamber surrounding said extrusion chamber and adapted to receive hydraulic fluid to provide external support to said extrusion chamber against internal pressure developed therein; iii. a pressurizing cylinder communicating with said jacket chamber and adapted to receive hydraulic fluid; b. a piston slidably mounted within said pressurizing cylinder; c. first hydraulic ram means connected at one end to said pressure vessel and connected at the other end to said piston and adapted to advance said piston within said pressurizing cylinder to pressurize the hydraulic fluid in said jacket chamber to a first level; d. a die ram; e. a die mounted on said die ram; f. second hydraulic ram means connected at one end to said die ram and connected at the other end to said piston and adapted to advance said die ram and said die into said extrusion chamber and against said billet to pressurize said extrusion medium and extrude said billet through said die and simultaneously to further advance said piston within said pressurizing cylinder to increase the pressure of the hydraulic fluid in said jacket chamber from said first level to a second level sufficient to externally support said extrusion chamber against internal pressure developed therein.

Claim 9

Apparatus as in claim 5, wherein: g. said pressurizing cylinder is an annular chamber; h. said piston comprises an annular member slidably mounted in said pressurizing cylinder.

Claim 10

Apparatus as in claim 6, wherein: i. said piston is provided with a passageway extending to the end of the annular member; j. check valve means interposed between the end of the annular member and said pressurizing cylinder and adapted to permit the flow of hydraulic fluid in one direction only from said passageway to said pressurizing cylinder.