Process for producing a heat pipe
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorsTakeo Sata, Masayuki Takamura, Norio Shinoda, Masataka Hatae
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Abstract
Through employment of a core-and-sheath construction having a number of axially elongated indentations along the border for the billet with the core of an easily soluble material, extrusion such as hydrostatic extrusion can advantageously be utilized for production of heat pipes with enhanced precision and operational efficiency in process. Indentations, which work as a wick in the heat pipe, may be provided by forming axially elongated grooves either in the inner peripheral surface of the sheath or in the outer peripheral surface of the core.
Claims17
A process for producing a heat pipe, comprising the steps of:
- forming a billet comprising a water soluble salt core and an axially elongated non-water soluble sheath, said sheath including a plurality of axially extending capillary grooves formed along the inner periphery thereof, said salt core filling the interior of said sheath including said axially extending capillary grooves;
- subjecting said billet to compulsory plastic deformation by extrusion in such a manner that the dimensions of said sheath, including the dimensions of said capillary grooves, as measured in the radial direction are reduced;
- and thereafter
- removing said core through solution in water to obtain said heat pipe.
Dependencies are inferred from the claim text.