In-situ slurry formation and delivery apparatus and method

Inactive Publication Date: 2007-03-01
MAG OPERATING U S +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Casting complex geometries may yield products with undesirable shrink porosity, which can adversely impact the quality and integrity of the cast part.

Method used

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  • In-situ slurry formation and delivery apparatus and method
  • In-situ slurry formation and delivery apparatus and method
  • In-situ slurry formation and delivery apparatus and method

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Embodiment Construction

[0020] The foregoing needs are met, to a great extent, by the present invention, wherein in one aspect an apparatus is provided that in some embodiments combines various methods of die casting with semi-solid metal in an efficient manner. There are, of course, additional embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto.

[0021] Casting methods such as die casting, gravity permanent mold casting, and squeeze casting have been used for Aluminum-Silicon (Al-Si) alloys. In thixocasting semi-solid metal casting (SSM), specially prepared metal slugs are gradually brought to a semi-solid state, then transferred to the casting machine, where a ram uses pressure to inject the SSM into a die. Once solidified, the die opens and the cast part is ejected. With SSM, the viscosity is fairly high so the injection speed is lower than with conventional pressure die casting. This results in little or no turbulence, which redu...

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Abstract

An embodiment of the presently claimed invention includes an in-situ slurry formation apparatus mounted to die casting machines to convert liquid metal to semi-solid metal (SSM). Thus, there is no need to modify existing machines or change the cell layout to accommodate more space than would otherwise be necessary. These machines also need not be replaced with machines specially designed for SSM. Further, a method for converting molten metal to semi-solid metal includes coupling a conduit to a die casting machine, wherein the conduit comprises an inlet, an outlet and a body disposed between the inlet and the outlet, regulating the conduit's temperature, surrounding the conduit with a housing, inserting molten metal at the inlet, cooling the molten metal to semi-solid metal in the body, and expelling semi-solid metal from the outlet.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to provisional patent application entitled, IN SITU SLURRY FORMATION AND DELIVERY TO DIE CAST MACHINES, filed Aug. 23, 2005, having a Ser. No. of 60 / 710,165, the disclosure of which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates generally to casting metal alloys. More particularly, the present invention relates to semi-solid metal casting. BACKGROUND OF THE INVENTION [0003] Casting complex geometries may yield products with undesirable shrink porosity, which can adversely impact the quality and integrity of the cast part. Shrink porosity defines a condition that arises as a metal part begins to shrink as it cools and solidifies along the outer surface, leaving pockets of air (referred to as “voids”) trapped in the center of the part. If the voids are not reconstituted with the metal, the cast part is termed “porous.” This condition is preva...

Claims

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Application Information

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IPC IPC(8): B22D17/08B22D23/00B22D25/00
CPCB22D17/007B22D35/06
InventorBIGELOW, JOEBROWN, ZACHKILLINGSWORTH, DAYNEMUSSER, MARK A.
OwnerMAG OPERATING U S