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US 5,392,628 AGranted
Press assembly for extruding a billet
AssigneeTechint Compagnia Tecnica Internazionale S.p.A.
InventorGiancarlo Cristiani
Life of this patent
Estimating the term…
Abstract
An extrusion press has a sealing and suction device (30; 230; 330) mounted around a plunger (18; 118) with the possibility of sliding axially along the same; the device creates an airtight seal against a back face (25) of a container (20) for a billet (B) when the plunger is working within an inner chamber (24) of the container. A vacuum is created inside the chamber as soon as the plunger enters the chamber before extrusion of the billet begins.
Claims4
A press assembly (10;
- 100;
- 300) for extruding a billet (B) along a longitudinal axis (a), comprising:
- a cross member (12;
- 112) movable along the longitudinal axis;
- a plunger (18;
- 118) movable with the cross member;
- a container (20) having a back face (25) and an inner chamber (24) aligned with the longitudinal axis for receiving the billet to be extruded;
- a sealing and suction device (30;
- 230;
- 330) arranged around the plunger, said device including
- first means (34;
- 240;
- 342) for sealing a space containing air against the plunger;
- second means (36;
- 246;
- 336) for sealing the space against the back face of the container;
- an elastic skirt wall means (32;
- 232, 234;
- 332) for connecting the first sealing means with the second sealing means;
- passage means.(42;
- 256;
- 346) for allowing suction of the air from said space;
- and
- elastic means (39;
- 239;
- 350) for pushing the sealing and suction device against the back face of the container;
- wherein said elastic pushing means is a thrust spring (350) formed by a helical winding of a metal strip surrounding the longitudinal axis.
24 more elements
A press assembly (10;
- 100;
- 300) for extruding a billet (B) along a longitudinal axis (a), comprising:
- a cross member (12;
- 112) movable along the longitudinal axis;
- a plunger (18;
- 118) movable with the cross member;
- a container (20) having a back face (25) and an inner chamber (24) aligned with the longitudinal axis for receiving the billet to be extruded;
- and
- a sealing and suction device (30;
- 230;
- 330) arranged around the plunger, said device including
- first means (34;
- 240;
- 342) for sealing a space containing air against the plunger;
- second means (36;
- 246;
- 336) for sealing the space against the back face of the container;
- an elastic skirt wall means (32;
- 232, 234;
- 332) for connecting the first sealing means with the second sealing means;
- passage means.(42;
- 256;
- 346) for allowing suction of the air from said space;
- and
- a pair of first and second annular elements (232, 234) sliding on each other axially.
22 more elements
Dependencies are inferred from the claim text.