59th Technical Conference & Expo Program
system with drying times that reflect current industry prac- tice. The efficacy of using the system within a production environment is also analysed. The large thermal gradients during firing and push for even shorter lead times results in new challenges for a rapid shell system which are pre- sented and investigated within this paper.
11:25 a.m. - 12 noon ..................................... Paper No. 6 Steven Murtagh, A.W. Bell Pty. Ltd. Water Blast Systems for Aftercast Shell Removal In 2008, A. W. Bell developed a joy stick controlled
semi automated water blast unit for use in its foundry for the removal of ceramic shell from both ferrous and nonfer- rous castings. The company is located in a region that at the time was in a severe 10-year drought. The cost of wa- ter and sewerage disposal had risen significantly. From this environment developed the idea to design, build and install a semi automated joystick controlled water bast unit that recycled the water for repeated use and improved productivity. Secondary benefits included the elimination of safety risks associated with use of knock out hammers and exposed water blast nozzles. When the water qual- ity becomes contaminated it becomes extremely erosive and can cause costly damage to the internal components of the system, potentially stopping production. A. W. Bell has pioneered a closed loop filtration system as part of the water blast unit that overcomes these problems. The objective of the paper is discuss the cost and benefits that should be considered when developing a sound business case for the acquisition of a semi automated water blast system.
12 noon - 12:15 p.m. .... CASTING CONTEST AWARDS 12:15 - 1:15 p.m.
.................................................LUNCH
1:15 - 1:50 p.m. ............................................ Paper No. 7 Julie Markee, Key Process Innovations; Xinyu Wang, Selmet, Inc. RH Sensor: A New Method for Measuring Dryness During the Shell Building Process The increasing complexity of the precision investment
INDUSTRIAL CERAMIC PRODUCTS, INC. 14401 Suntra Way, Marysville, OH 43040
casting parts presents challenges within the shellbuilding process, especially around shell drying. This can result in increased scrap or rework in the form of excess metal, fin- ning or even foundry run- outs. Current methods of mea- suring dryness include temperature, humidity, conductiv- ity and weight loss. However, none of these methods are capable of measuring dryness of the internal passages with accurate, repeatable results. With the development of a new method for measuring dryness, an investment casting foundry will now have the ability to measure both temperature and relative humidity in the inner passage- ways during the shell building process. This device can assist shell room personnel in establishing a shell building
Water Soluble Internal Cores
• No Blasting or Caustic • Samples Available Nonferrous applications only
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September 2012
process or as a tool to identify variation during drying. This paper will provide a comparison of current drying mea- surement systems against the newly created RH sensor. In addition, Selmet will demonstrate the application of this device by using it to assist in the establishment of optimal drying conditions for a newly constructed drying tunnel.
1:50 - 2:25 p.m. ............................................ Paper No. 8 Chris Whitehouse, Minco Inc. Healthy Shell-Wide Distribution Stucco Blends and Their Affect Upon Shell Performance, Part II The performance of ten different “wide-distribution”
fused silica stucco blends was presented in Kyoto at the 13th World Conference on Investment Casting. A three factor simplex lattice design with overall centroid and inte- rior points was chosen for the experiment. This afforded use of a ternary diagram based upon corner points of 50% 10x20/ 50% 30x50, 50% 50x100/ 50% 30x50 and 100% 30x50 to plot the topographical 3D response surfaces. The data demonstrated expected results in thickness and strengths, but also suggested the possibility of improved performance in some regions. The results suggested that custom stucco blends might be used to address specific investment cast foundry shell needs. This paper reviews some of the prior work and attempts to confirm the find- ings of the previous study with three new wide-distribution stucco blends focused upon a particular smaller region of interest. This paper will also make suggestions on how stucco blends might best be implemented in a production environment.
2:25 - 3 p.m. ................................................. Paper No. 9 Russ Rosmait, Pittsburg State University Recruiting Strategies to Hire Great People: Is it time to Rethink your Hiring Practice?
3 - 6 p.m. ................................................................EXPO
INDUSTRIAL CERAMIC PRODUCTS, INC. 14401 Suntra Way, Marysville, OH 43040
INVESTMENT CASTING PRODUCTS
Quality conscious investment casters consider the use of ICP ceramic compo- nents essential to the production of superior castings. ICP offers a complete line of ceramic products designed to improve the production of investment castings.
Samples or prototypes available for evaluation.
To place your order:
Pouring Cups Internal Cores Cover Plates Crucible Liners Rods Rings
Melt Out Plugs Tubes Snouts
Mold Supports Phone (800) 427-2278 Fax (937) 644-2646
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