US 3,974,872 AGranted

Method and apparatus for production of casting molds

OwnerErwin Buhrerinventor

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Abstract

In a system for the production of molds for casting, a pair of pattern plates are disposed in an opposed facing relationship with a frame located therebetween in a manner whereby the opposing pattern surfaces of the plates, together with the frame, define an enclosed cavity within which a casting mold section may be formed. The frame is preferably provided with an opening through which the cavity may be filled with molding material which, after hardening, forms a mold section. After separation of the pattern plates and frame, the mold section is conveyed into assembled relationship with one or more other mold sections in order to form a mold for casting. Pattern plates and frames may be arranged in a mass production facility to continuously form mold sections which, when assembled, will provide a mold stack for producing multiple castings.

Claims22

Dependent claims

A method for producing foundry mold sections from a mold-forming material having a resin binder comprising the steps of arranging at least two movable pattern plates each having a pattern surface formed thereon in opposed relationship with said pattern surfaces facing each other, disposing between said pattern plates a frame adapted to define together with said pattern plates a mold-forming cavity having a single continuous fixed volume which is peripherally enclosed by said frame when said plates are brought into engagement with said frame therebetween, moving both said pattern plates together into engagement with said frame to form said mold-forming cavity with said pattern plates spaced by said frame a fixed predetermined distance apart, blowing into said mold-forming cavity said mold-forming material having a resin binder through means connected to said frame, holding said pattern plates and said interposed frame in a fixed relationship relative to each other during setting of said mold-forming material within said cavity thereby to form a mold section, said pattern plates and said frame being thus held by means engaging said pattern plates, separating said pattern plates and said frame by moving said pattern plates away from said frame while holding said frame stationary after formation of said mold section by utilization of means engaging said pattern plates and said frame, and thereafter removing said mold section from said frame.

Apparatus for producing foundry mold sections from mold-forming material having a resin binder comprising at least two movable pattern plates, a pattern surface formed on each of said pattern plates, said pattern plates being arranged in opposed relationship with said pattern surfaces of said pattern plates facing each other, a frame located in engagement between said pattern plates to space said pattern plates a fixed predetermined distance from each other, said frame being configured to peripherally enclose the space between said pattern plates to define therebetween a mold-forming cavity having a single continuous fixed volume, means connected to said frame for blowing into said mold-forming cavity said mold-forming material having a resin binder, means engaging said pattern plates for holding said pattern plates and said interposed frame in a fixed relationship relative to each other during setting of said mold-forming material within said cavity thereby to form a mold section, means engaging said pattern plates and said frame for separating said pattern plates and said frame by movement of said pattern plates away from said frame while said frame is held stationary after formation of said mold section to enable removal thereof, said means for separating including means for maintaining said frame stationary during the separation of the pattern plates from said frame and said mold section contained therein and further means for removing from said frame said mold section.

Dependencies are inferred from the claim text.