Plunger for a diecasting machine
AssigneeAllper AG
InventorAndre Mueller
Life of this patent
Estimating the term…
Abstract
A plunger for forcing molten aluminum or brass out of a casting cylinder of a diecasting machine includes a cap which is screwed via an internal thread onto an external thread of a supporting body and is made of a material, in particular a copper alloy, which has a greater coefficient of thermal expansion than the material of the cylinder, in particular steel, and the material of the supporting body, in particular steel. An inner cover face of the cap bears against a front face of the supporting body and, with its internal thread, is screwed thermally onto the external thread of the supporting body, and in addition, is preferably shrunk on thermally.
Claims24
A plunger for forcing molten metal out of a casting cylinder of a diecasting machine, comprising:
- (A) a supporting body which is made of a material having a first coefficient of expansion and which has an external thread and a front face formed thereon, said supporting body having a feed channel and a return channel formed therein;
- and
- (B) a cap which is formed of a second material having a second coefficient of expansion higher than that of said first material, said cap being attached to said supporting body via an internal thread which engages said external thread of said supporting body and being thermally shrink fitted onto said supporting body, said cap having an inner cover face which bears against said front face of said supporting body and which defines an annular channel which extends along a periphery of said inner face of said cap and said front face of said supporting body, which receives coolant from said feed channel, and from which coolant is drawn off through said return channel.
A plunger for forcing molten metal out of a casting cylinder of a diecasting machine, comprising:
- (A) a supporting body which is made of a material having a first coefficient of expansion and which has an external thread and a front face formed thereon;
- (B) a sealing ring having a frontal boundary surface and an inner annular ridge formed thereon;
- and
- (C) a cap which is formed of a second material having a second coefficient of expansion higher than that of said first material, said cap being attached to said supporting body via an internal thread which engages said external thread of said supporting body, said cap having
- (i) an outer cover face, and
- (ii) a cylindrical shoulder located on said outer cover face, said shoulder having an annular recess for accommodating said inner annular ridge of said sealing ring, a frontal boundary surface of said shoulder and said frontal boundary surface of said sealing ring being slanted towards each other in a V-shaped manner.
Dependencies are inferred from the claim text.