Heat insulation plunger sleeve for die casting machine
OwnerTakahiro Kaba, Jun Funakoshiinventors
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Abstract
The invention provides a plunger sleeve for use in die casting machines which is outstanding in heat insulating and heat-retaining properties and which is capable of suppressing the drop in the temperature of molten nonferrous metal to the greatest extent and maintaining a stabilized casting operation under pressure. The plunger sleeve comprises a first metal layer made of a metal having high heat resistance and forming the inner periphery of the sleeve, a second metal layer providing the outer periphery of the sleeve, and a ceramic layer formed between the first metal layer and the second metal layer. The ceramic layer comprises a ceramic powder and/or a ceramic fiber consolidated to at least 50% to not greater than 90% in relative density.
Claims10
A heat insulating plunger sleeve for use in die casting machines which comprises a hollow cylinder provided at a base end thereof with a molten metal outlet adapted to communicate with a die and connecting means connectable to the die, the hollow cylinder having an opening at an outer end thereof for a plunger tip to be inserted thereinto and a molten metal inlet formed in a peripheral wall thereof for injecting a molten metal into the cylinder therethrough,
- the plunger sleeve being characterized in that the sleeve comprises a first metal layer made of a metal having high heat resistance and providing an inner periphery of the sleeve, a second metal layer providing an outer periphery of the sleeve, and a ceramic layer formed between the first metal layer and the second metal layer, the ceramic layer comprising a ceramic powder and/or a ceramic fiber consolidated to at least 50% to not greater than 90% in relative density.
Dependencies are inferred from the claim text.