Method of making an injection molding nozzle

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

1994-10-11

1995-08-01

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

164108, 2281801, H05B 300

Patent

active

054370930

ABSTRACT:
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.

REFERENCES:
patent: 4355460 (1982-10-01), Gellert
patent: 4403405 (1983-09-01), Gellert
patent: 4771164 (1988-09-01), Gellert

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