Patent ID: 6134936
Filing Date: 2000-10-24
Classification: B21C,H01L

Abstract:
A method for producing a heat sink with radiating fins, comprising:providing a mold of the type including a form section with an input end, an opposing discharge end, and at least one wall defining a first cavity therethrough, a plurality of spaced fin forms, each having a first end attached to one said form section wall and an opposing second end cantilevered from the first end, and a feed section having an input end, an opposing discharge end and an internal wall defining a second cavity generally coaxial with the first cavity;supporting said fin forms;forcing a semi-solid aluminum alloy into said feed section input end at a pressure and a flow rate;guiding the aluminum alloy into said form section;flowing the aluminum alloy past the supported fin forms;extruding a solidified heat sink having a Profile ratio greater than ten from said form section discharge end; andcutting said heat sink to a length.