Method of and apparatus for low-pressure casting of light metal alloy
First Claim
1. A method of low-pressure casting of a light metal alloy, comprising the steps of:
- applying a fluid pressure on the surface of a light metal alloy stored in a closed container to introduce the light metal alloy from the closed container through a transfer tube and a sprue into a mold cavity defined in a mold assembly;
bringing the introduced molten metal alloy into contact with molds of said mold assembly which comprise metallic material having different thermal conductivities, respectively; and
controlling a time in which the molten metal alloy is solidified with said molds to produce a casting.
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Accused Products
Abstract
A light metal alloy such as an aluminum alloy is cast into a casting such as an automobile engine cylinder head under low pressure. A fluid pressure is applied to the surface of a light metal alloy stored in a closed container to introduce the light metal alloy from the closed container through a transfer tube and a sprue into a mold cavity defined in a mold assembly. The introduced molten metal alloy is brought into contact with molds of the mold assembly which have different thermal conductivities, respectively. The time in which the molten metal alloy is solidified is controlled by the molds of different thermal conductivities. The molds may forcibly be cooled by a cooling medium passing therethrough or cooling blocks mounted thereon.
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Citations
20 Claims
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1. A method of low-pressure casting of a light metal alloy, comprising the steps of:
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applying a fluid pressure on the surface of a light metal alloy stored in a closed container to introduce the light metal alloy from the closed container through a transfer tube and a sprue into a mold cavity defined in a mold assembly; bringing the introduced molten metal alloy into contact with molds of said mold assembly which comprise metallic material having different thermal conductivities, respectively; and controlling a time in which the molten metal alloy is solidified with said molds to produce a casting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for low-pressure casting of a light metal alloy, comprising:
a mold assembly defining a mold cavity for receiving a light metal alloy therein, said mold assembly being composed of an upper mold, a lower mold having a sprue, and slidable molds separably fitted in said upper and lower molds, said upper, lower, and slidable molds being made of metallic materials having different thermal conductivities which are progressively lower in a direction from said upper mold toward said lower mold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
Specification