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Fig. 6. Daily sand tests help identify variation and confi rm the changes made to stop the variation have worked. Incorporating a mass balance clay system at Grede-St. Cloud proved to reduce signifi cantly live clay variation starting in July 2006.


Because not much can be done with the new sand, improving permeabil- ity or size distribution in the plant is done by adjusting the dust collection system through key collection points in the facility—such as by the con- veyor discharge points, rotary screen or coolers. If the sand in the system is too fi ne, open up the draw more at the key collection points. If the sand is too


coarse, close the draw a little. At Grede-St. Cloud, some jobs are


highly cored while others have little core input. When the facility is run- ning highly cored jobs with fresh new sand, the sand in the green sand system can become too coarse. If not enough fi nes are available, it may be necessary to adjust the grade or amount of sand added directly to the green sand system.


It’s not recommended to adjust the core sand grade because that could aff ect core strength. Variation in the sand mix inhibits the


ability to produce consistent, quality cast- ings. In order to eliminate the variation, a good sand testing program will include daily tests and then use the resulting data to monitor and make adjustments to the system as needed.


HD EZEFIT wheel - for heavy duty performance


The HD EZEFIT blast wheel for Wheelabrator and non Wheelabrator machines, is designed with the latest technology to lower your cost per casting through increased productivity, improved efficiency and controlled flow of abrasive. Visit Wheelabrator booth 928 during the Metal Casting Congress in Columbus, Ohio.


Find out how we can help you improve your blast cleaning performance with our HD EZEFIT wheel conversion kits. USA: (800) 544 4144 • Canada: (800) 845 8508 E: info@wheelabratorgroup.com


Norican Group is the parent company of DISA and Wheelabrator. www.disagroup.com March 2015 MODERN CASTING | 37


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