Sprue bushing assembly and method of making same

Details Sprue bushing assembly and method of making same Sprue bushing assembly and method of making same

B - Operations, Transporting

29

C

18/709

B29C 45/00 (2006.01) B29C 45/27 (2006.01) B29C 45/73 (2006.01) F27D 11/02 (2006.01)

Patent

CA 1330694

Abstract of the Disclosure A sprue bushing which eliminates melt leakage and a method of making the same are described. A cylindrical bushing body having a first, preselected uniform diameter has an annular cavity formed therein which axially extends within the bushing body for a predetermined length and which separates the bushing inner core from the bushing body. A heating element in the form of a ceramic insulator sleeve is inserted into the annular cavity and a particulate refractory material is deposited into the annular cavity to fill the remainder of the annular cavity. When filled, the bushing body is swaged down to a second preselected uniform diameter to compact the powdered refractory together with the preformed sleeve to form a solid heating element. A runner passage is then drilled through the inner core so that the inner core is integral with the bushing casing.

610348

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