Preliminary Agenda Abstracts
MONDAY, AUGUST 22, 2022, con’t. 1:20 p.m. – 2:00 p.m. Viscosity Control for Consistent Casting Shell Building Sunil Kumar, Rheonics Quality assurance of casting shells depends on the viscosity of the shell-building slurry. This has two principal reasons. First, the viscosity is directly related to the solids content of the slurry and reflects shifts in its composition through evaporation of the liquid component. And second, the performance of the slurry is directly related to its flow characteristics. The thicker the slurry – the higher its viscosity – the slower it runs off the form and the thicker the layer that it deposits. If the viscosity is too low – the slurry is too thin – it flows off the form too quickly, and the deposited layer is too thin. If too high, it can produce too thick a layer, which may not dry or harden quickly enough, or may fail because of drying-induced stress. Since shells are formed from multiple layers, any deviations of slurry viscosity can contribute to failures of quality and performance of the shells, which can, in turn, lead to defects in the parts cast in the shells. In order to control viscosity, it is necessary to measure
it. The accuracy of control – how well the viscosity of a slurry can be set and maintained throughout the casting process – depends on the accuracy and repeatability, but also the ease of use, of the chosen measurement instrument. The traditional measurement method is the flow cup, which measures viscosity as the number of seconds required by the slurry to run out of the cup. This measurement is not suited for continuous, repetitive monitoring of viscosity, nor is it particularly accurate.
A robust balanced torsional resonator-based inline viscometer enables accurate, repeatable and continuous monitoring of slurry viscosity during shell building. An integrated slurry viscosity tracking and control system is used to apply the viscometer’s measurements toward maintaining constant slurry viscosity during slurry preparation and shell building, despite evaporation losses, temperature changes and other influences that can cause unwanted changes to the shell quality. The inline viscometer and the integrated control system can, in addition, support the growing trend toward full shell-room automation, by reducing an important source of variability in the otherwise highly automated shell- building process.
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2:00 p.m. – 6:00 p.m. EXPO – Disneyland Exhibit Hall & Disneyland North Ballroom
TUESDAY, AUGUST 23, 2022 7:00 a.m. – 5:30 p.m.
REGISTRATION – Disneyland Center Lounge
8:00 a.m. – 8:05 a.m. GENERAL SESSION – Disneyland Center Ballroom Greeting
8:05 a.m. – 8:40 a.m. Panel Discussion: Process Control Standards (PCS) for Investment Castings – Global Rollout Tom Planz, Kovatch Castings Inc. Nip Singh, S&A Consulting Group LLP Joseph E. Fritz, Investment Casting Institute As Process Control is critical to the manufacture of
investment castings worldwide, we would like to involve all sectors of investment casting in all countries. This panel will present the current status of the Process Control Standards (PCS) and also will detail how EICF and JFS Members can start using this ICI Member benefit. The task force on PCS, a subgroup under the Education Committee, has made considerable strides in the rollout of the program for North American ICI Members since our last presentation at ICI 68th Technical Conference in 2021. The training program for surveyors (Internal/Independent)
certification was developed by the core team, tested, and is now available on the Tune’Em platform for certification. As of abstract submission, the ICI has certified its first Independent Surveyor, two Internal Surveyors and is actively seeking to certify additional surveyors. At this time, one North American foundry has received its Bronze Certification. The Core PCS Team has established a Process Control
Standard Certification Panel (PCSCP), comprised of several of the original members from that Team. This panel is responsible for the oversight of the day-to-day operation of the Program, and as part of the “panel discussion”, the team will detail ongoing operations. Certified foundries and surveyors will be invited to share their PCS experiences with WCIC Delegates. The PCS Core Team will join the panel to answer any questions.
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26 ❘ May 2022 ®
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