Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1989-05-24
1991-07-23
Seidel, Richard K.
Metal founding
Process
Shaping liquid metal against a forming surface
164120, 164138, B22C 300, B22D 1708, B22D 1722
Patent
active
050335324
ABSTRACT:
This invention provides a die casting method comprising the steps of that a pulverized insulation agent is coated to form a porous insulation layer on the interior surface of die cavity when a casting products are made by utilizing a die casting machine, wherein a molten metal is filled into the cavity with a slow pace thereon, a high pressure is applied upon the molten metal mechanically so as to crush and make thin the porous insulation layer pressed by the high pressurization upon the molten metal, simultaneously the molten metal sinks into and passes through the porous insulation layer to reach at the interior surface of the cavity wherein the molten metal is rapidly solidified to produce a final casting products according to the temperature drop due to the direct contact with the interior surface of the cavity. By providing the porous insulation layer in the interior surface, the molten metal is well spread on the nook and corner of die cavities during the restriction of solidification speed, thereby can prevent the occurrences of pine hole or blowhole upon the casting product. Further by selecting a lubrication type insulation agent, it can facilitate the removal of casting product from the cavity wherein has no further use for any conventional type mold-releasing agent deemed as a pollutive material.
REFERENCES:
patent: 3387646 (1968-06-01), Lauth
patent: 3472308 (1969-10-01), Lauth
patent: 4264052 (1981-04-01), Radtke et al.
patent: 4425411 (1984-01-01), Textor et al.
Ahresty Corporation
Batten, Jr. J. Reed
Seidel Richard K.
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