FORFARANDE OCH ANORDNING FOR FRAMSTELLNING AV GJUTFORMAR

摘要

A program controlled customized method for making molds comprises the steps of dispensing a layer of molding material including a mixture of sand and binder over a mold forming pattern by means of relative movement between a dispensing device and the pattern while selectively varying the ratio of sand and binder in the mixture dispensed in predetermined areas of the pattern or in successive layers to provide a mold of the desired strength in certain critical areas while conserving the amount of binder needed for the completed mold.