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Metal Casting Technologies : June 2007
Supercharge Your Green Sand System Green sand systems work harder and last longer with TRUBOND®. These sodium bentonite grades mull in quickly and undergo a controlled hydration to develop a stronger, more elastic adhesive. TRUBOND delivers excellent green compressive and hot strength properties and maintains its working bond in repetitive exposure to high heat loads and metal temperatures. SODIUM BENTONITE Unimin Australia Limited Tel.: +613 9586 5400 Fax: +613 9586 5411 E-mail: email@example.com ® TRUBOND is a registered trademark. All rights reserved. ©2003 Worldwide: www.metalcaster.com 2.4 Control algorithm Except for the rapid digital assembled valve system, advanced control algorithm is necessary in CGCE [5,6]. When designing the controlling software we have improved the traditional PID algorithm in which fuzzy controlling thoughts were used. Fig. 6 shows the pressure-tracing curves adopting the method of classical PID and PID associated with fuzzy control. It is found that the pressure tracing property of the system is improved considerably by introducing the method of fuzzy control. It benefits the stable filling mold. 3. COUNTER-GRAVITY CASTING TECHNOLOGY Compared to gravity casting, counter-gravity casting has to use a different gating system. Although laminar filling and ordinal solidification are its inherent features, an appropriate gating system is of vital importance. We must assure that the top positions of the casting solidify first because the filling of molten metal comes from the Fig. 6 Pressure-tracing curves under different control algorithm