Method for producing a feeder having an exothermic feeder body, and a feeder having an insulating external shell

Abstract

The invention relates to a method for producing a feeder configured for use in a casting mold used for casting metals, wherein the feeder has a feeder body () enclosing a feeder cavity () and a through opening () in its base region () for connecting the feeder cavity () to the casting mold and the feeder body () consists of an exothermic material and is enclosed on its outer side at least in regions by an external shell () consisting of insulating refractory material, and wherein the feeder is provided with a feeder foot () arranged externally in its base region () and having an opening () flush with the through opening (). The feeder is characterized in that the feeder body () produced in a first step in a conventional method from an exothermic material is used together with the feeder foot () associated with the base region () to form the external shell () into an injection mold () having a mold cavity () and feeder body and feeder foot are shot simultaneously with the insulating material, wherein the feeder body () including the feeder foot () is positioned in such a manner that the insulating material shot into the mold cavity () of the injection mold () fills in a gap () left between the feeder foot () and the base of the mold cavity () at least one part of the circumference of the feeder foot () and extending over at least a part of the height of the feeder foot (), and the shot external shell () thereby extends at least partially under the feeder foot () with the exception of its opening () and is attached to the base region () of the feeder body () without the use of auxiliary means.