Hollow sand cores to reduce gas defects in castings

US8540009B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Michael J. Walker · Windsor, CA
• Thomas C. Pederson · Rochester Hills, US
• Jason R. Traub · Sterling Heights, US
• Anil K. Sachdev · Rochester Hills, US

Key dates

• Filing date: Feb 23, 2009
• Grant date: Sep 24, 2013
• Expiry date: Jan 22, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C9/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An exemplary method for forming a sand core includes forming a core insert; forming a sand core precursor around the core insert; and creating at least one passage within the sand core precursor by removing or otherwise transforming a portion of the core insert, wherein the at least one passage includes at least one exit point. The sand core may then be utilized in a casting mold assembly to form a cast part.