Method of making an injection molding nozzle

Details Method of making an injection molding nozzle Method of making an injection molding nozzle

B - Operations, Transporting

21

C

B21C 25/10 (2006.01) B23P 15/00 (2006.01) B29C 45/20 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2132281

A method of manufacturing an injection molding nozzle having an integral electrical heating element. The heating element is mounted in a space formed between an inner core, an outer rear collar and an outer sleeve. The space is first sealed by brazing with a nickel alloy brazing material and a copper conductive material is then cast into the space. Both the brazing and casting are done in a single controlled cycle of a vacuum furnace. An insulative cap is placed over the assembly so a supply of inert gas to the vacuum furnace cools the copper conductive material from the bottom up. This produces unidirectional solidification to avoid the formation of voids in the copper conductive material and improve thermal conductivity.

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