Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2005-05-12
2010-12-21
Lin, Kuang (Department: 1793)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S312000
Reexamination Certificate
active
07854250
ABSTRACT:
By pouring, by means of pressure, melted liquid of magnesium or magnesium alloy into a hollow portion which is formed using a casting mold, a valve body where a channel groove for hydraulic oil for use in a speed change operation of the automatic transmission is formed. In the above, the channel grove for the hydraulic oil is formed due to a convex portion which is formed on the mold so as to project into the hollow portion. As the magnesium has small heat capacity, variation of the temperature of the mold during the cooling and heating cycle can be suppressed. Moreover, as the magnesium melted liquid has no reactivity with respect to the casting mold, the convex portion is not deteriorated. This allows employment of a mold having a thinner convex portion formed thereon, and therefore formation of a valve body having a narrower channel groove.
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Aoyama Toshihiro
Itou Shin-ichi
Kitano Tomoyasu
Murakami Akira
Finnegan Henderson Farabow Garrett & Dunner LLP
Lin Kuang
Toyota Jidosha & Kabushiki Kaisha
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