消失模型鋳造法におけるアルミニウム合金の湯流れ

概要

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The experiment is regarded as a fundamental of a gas defect's countermeasure on the Evaporative Pattern Casting Process. Observations of the fluidity, the formation of a molten metal skin and the substitutional state of the EPS pattern-molten silumin were performed by adopting a new method. The results in this experiment are as follows: 1. By this new method, immediately after pouring, a suitable volume of water was poured into the mold in order to chill the mold. As a consequence, this method of observing the substitution between the EPS pattern and the molten silumin becomes a possible method.2. At the boundary of the pattern and mold, the space made by the molten silumin where the EPS pattern is heated quickly, is not filled by the molten silumin, but almost flows by contact on the molten silumin.3. The molten metal flows through the boundary of the pattern and molds firstly, and then wraps the EPS pattern, and finally fills the internal portion of the mold. So it is thought to be the usual cause of gas defects. 4. At the boundaries of the EPS pattern and the mold, the flow velocity of the molten metal is deeply affected by the vacuum degree; i. e., the higher the vacuum degree, the faster the flow velocity.
日本鋳造工学会の論文