Modelling and Control of Pressurized Molten Metal in Press Casting

作     者：Ryosuke Tasaki Yoshiyuki Noda Kunihiro Hashimoto Kazuhlro Terashlma 

作者机构：Department of Mechanical Engineering Toyohashi University of Technology Toyohashi 441-8580 Japan Department of Mechanical System Engineering Yamanashi University Kohu 400-8510 Japan Sintokogio Ltd. Toyokawa 442-8505 Japan 

出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)

年 卷 期：2012年第2卷第2期

页      码：77-84页

摘      要：This paper presents a modeling and control of molten metal＇s pressure in pressing process using an innovative iron casting developed by our group. In this method, molten metal is directly poured into a lower mold, and then pressed to fill cavity by an upper mold being lowered down. For complex liquid flow during pressing, the liquid＇s pressure changing inside vertical path with various contraction and expansion geometries is newly modeled via the unstationary Bernoulli equation. The mathematical model is derived for a control design of pressing. To conduct the pressing velocity design algorithm, an unknown parameter of proposed model considering viscous flow is identified by using CFD （Computational Fluid Dynamics） with heat flow calculation. Control performance using a multi-switching velocity pattern is confirmed as an effective control design using the pressure model, because the pressure fluctuation has discontinuous variation points. Substituting detailed information for mold shape, poured volume and initial temperature into a developed control input generator, an optimum pressing velocity design and a robust design for defect-free production are proposed by the design algorithm based on the construction of an inverse system comprised of the sequential switching from higher to lower speed. Consequently, the effectiveness of the pressing control with reasonable pressure suppression has been demonstrated through CFD.

主 题 词：Pressure control modelling metals sequential switching industrial production systems. 

学科分类：081901[081901] 0819[工学-海洋工程类] 08[工学] 080401[080401] 0804[工学-材料学] 081102[081102] 0811[工学-水利类] 

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