Process for washing a casting core
First Claim
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1. A method for producing an expendable coated sand core to form undercut regions in a casting;
- the steps comprising;
(1) mixing said sand with less than about 2% by weight of said sand with a resinous binder and a catalyst,(2) placing the mixture in a mold for shaping the core,(3) heating the mold to a temperature below about 450°
F. until most of said resin in polymerized to produce a solid core,(4) cooling said core to about room temperature,(5) dipping the cooled core in a lower aliphatic alcohol to wash out unpolymerized residuals near the surface of said core,(6) drying said core to remove said alcohol,(7) coating said core with a liquid suspension of at least one refractory material, and(8) drying said core to remove said liquid from said suspension.
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Abstract
The disclosure concerns a process of producing expendable coated cores for castings comprising mixing sand with a resinous binder, polymerizing the binder, and then washing the resulting bound sand core with an organic solvent to remove unpolymerized residuals from the surface of the core before applying a coating to the core.
7 Citations
7 Claims
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1. A method for producing an expendable coated sand core to form undercut regions in a casting;
- the steps comprising;
(1) mixing said sand with less than about 2% by weight of said sand with a resinous binder and a catalyst, (2) placing the mixture in a mold for shaping the core, (3) heating the mold to a temperature below about 450°
F. until most of said resin in polymerized to produce a solid core,(4) cooling said core to about room temperature, (5) dipping the cooled core in a lower aliphatic alcohol to wash out unpolymerized residuals near the surface of said core, (6) drying said core to remove said alcohol, (7) coating said core with a liquid suspension of at least one refractory material, and (8) drying said core to remove said liquid from said suspension. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- the steps comprising;
Specification
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Current AssigneeHarvard Industries RISK Management
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Original AssigneeFarley, Inc. (Wagon PLC)
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InventorsDowning, Robert E.
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Primary Examiner(s)Seidel, Richard K.
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Assistant Examiner(s)PELTO, REX
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Application NumberUS07/418,586Time in Patent Office322 DaysField of Search164/520, 164/523, 164/14, 164/526, 106/38.22US Class Current164/14CPC Class CodesB22C 9/10 Cores; Manufacture or insta...
