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T e researchers’ results


show a potential path to improving green sand controls. T e use of ambient and elevated temperature testing can provide a


two-pronged approach to


controlling thermomechanical properties of


green sand systems.


number of jolts sustained increased, meaning increased strength (Fig. 6). Green sand system B (100% South- ern bentonite) was superior in ultimate strength for every compactability level tested. Similarly, toughness increased alongside compactability (Fig. 7). Green sand system B (100% Southern bentonite) was able to absorb more energy for every compactability level tested. T e thermal erosion, wet tensile strength, modifi ed


cone jolt toughness and the friability tests were able to diff erentiate among various compactability levels. Friability and thermal erosion tests (both ambient and elevated temperature) indicated that 100% Western bentonite (sand system A) had superior abrasion resis- tance. In support of this fi nding, the green sand system A had the higher wet tensile strength. T e modifi ed cone jolt toughness test was able to identify diff erences among green sand systems at the target compactability. At ambient conditions, the 100% Southern bentonite (sand system B) was able to sustain a greater number of jolts and was stiff er and tougher than sand system A. Further, results from blends (green sand systems C, D and E) indicated no signifi cant improve- ment in the mechanical properties over sand system A. T e researchers’ results show a potential path to


improving new green sand controls via thermal erosion and modifi ed cone jolt tests. In addion to currently wide- spread testing methods, non-standard procedures includ- ing ambient and elevated temperature testing may provide a two-pronged approach to sand testing. T ermal erosion and modifi ed cone jolt toughness tests may improve the measurement and control of thermomechanical properties of green sand systems.


T is article is based on the paper, “Dynamic Testing of Green Sand” (15-091), which was presented at the 119th Metalcasting Congress in Columbus, Ohio.


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info@brokkinc.com | www.brokk.com/us September 2015 MODERN CASTING | 39


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