Method of making a refractory mold

摘要

A method of making a bonded refractory mold is disclosed. The method includes forming a fugitive pattern including a thermally removable material. The method also includes forming a refractory mold including a mold wall, the mold wall including a refractory material and defining a sprue, a gate and a mold cavity, the gate having a gate inlet opening into the sprue and a gate outlet opening into the mold cavity, the mold defined by the fugitive pattern. The method further includes forming a gas vent that extends through the mold wall. The method also includes covering the gas vent with a gas permeable cover.

主权项

1. A method of making a bonded refractory mold, comprising:
forming a fugitive pattern comprising a thermally removable material; forming a refractory mold comprising a mold wall, the mold wall comprising a refractory material and defining a sprue, a gate and a mold cavity, the sprue having a sprue outlet on an end thereof, the gate having a gate inlet opening into the sprue and a gate outlet opening into the mold cavity, the mold defined by the fugitive pattern; forming a gas vent comprising a discrete aperture extending through the mold wall in at least one of the gate or the sprue, other than the sprue outlet; and covering the gas vent with a gas permeable cover that is disposed on an outer surface of the mold wall and covers the aperture, the gas permeable cover configured to exclude a support medium surrounding the mold from passage into the mold through the aperture.