Papers by Author: Yoshiyuki Noda

Abstract: This paper presents a novel method of sand mold press casting. In this process, molten metal is poured into a drag mold, and then the cope mold is placed on top of the drag mold, and the two molds are matched. The mold design for casting, the pouring control and the velocity control of the press have been previously clarified as key factors in the manufacture of sound products. This paper presents methods for modeling and control of the molten metal’s pressure for novel sand press casting technique. Substituting detailed information for the complex mold shape, the 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 sequential control algorithm based on the construction of an inverse system comprised of a sequential switching from higher to lower speed. The effectiveness of adaptive press casting is demonstrated by using CFD model simulations.

Abstract: This paper gives an advanced control to a strip caster with tilting-ladle-type automatic pouring system. The strip caster has been used for producing ferrous and nonferrous sheets. In the process, in order to obtain the high-quality products, it is required that the molten metal in the tundish keep the high liquid level. Therefore, the control system to liquid level in the tundish is proposed in this present paper. In this approach, the mathematical model from the control input into the motor for tilting ladle to the liquid level in the tundish is derived by using hydrodynamics. Then, for reaching quickly the molten metal to the high liquid level and keeping stably the liquid level, the control input into the motor is designed systematically by using the mathematical model. The proposed control system has advantage that it can be constructed simply. And, any sensors for measuring the liquid level are not required in the proposed system.