Surface roughness can be infl uenced by the size of the sand grains.
Metal penetration can be caused by poor sand compaction or hot spots such as near the gate.
Veining is an indicator of excess nitrogen that can be several millimeters wide and often runs perpendicular to the surface.
@
ONLINE RESOURCE
Read about defects specifi c to other casting processes in our archives at
www.metalcastingdesign.com
• “Eliminating Zinc Die Casting Defects,” Metal Casting Design & Pur- chasing, Sept/Oct 2012
• “Advancing Casting Capabilities,” Metal
Casting Design & Purchasing, May/June 2011
• “Name That Defect,” Metal Casting Design
& Purchasing, Nov/Dec 2010
36 | METAL CASTING DESIGN & PURCHASING | Jan/Feb 2014
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