Adaptive Press Casting for Complex Shape Production Using Molten Metals Pressure Control inside Greensand Mold
This paper presents a modeling and control of molten metals pressure using a new type of iron casting. We have developed a greensand mold press casting. In this method, molten metal is directly poured into the lower mold, and then pressed to fill the cavity by the upper mold being lowered down. Our past test results showed a casting yield of 90％- 95％. During high-speed pressing, filling fluid rapidly increases pressure and flows into the interspace between sand particles. To conduct the pressing velocity design algorithm, a mathematical pressure-model is built by using CFD: Computational Fluid Dynamics. The proposed model is based on Bernoullis theorem considering viscous flow depending on fluid temperature. A sequential switching control is proposed from higher velocity to lower velocity, because the pressure fluctuation has discontinuous variation points. This multi-switching velocity input is changed in accordance with the flow path change in sequence. Consequently, the effectiveness of the press casting with reasonable quality has been demonstrated through the experiments.
press casting pressure modelling pressure control temperature analysis sequential control switching velocity
R. Tasaki Y. Noda K. Terashima K. Hashimoto
Department of Production Systems Engineering, Toyohashi University of Technology ,Hibarigaoka I-I, T Sintokogio, Ltd. , Honohara 3-1, Toyokawa, 442-8505, Japan
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
1029-1034
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）