生型試験片の静的および動的特性に及ぼすスクイズ条件の影響

抄録

  To make sound cast iron castings, it is necessary to use the green sand mold with good mold properties. The green sand mold requires comfortable green sand properties, which are compactability (CB) index, moisture content, permeability, bulk density, and so on. The green sand test piece of ø50 × 50mm is used to measure these properties. Therefore, it is important how the green sand test piece is made. In this study, three types of test piece equipment were used to make green sand test pieces by changing the making method, squeeze speed, squeeze pressure, and sand type. The static and dynamic properties of the test piece are measured. The dynamic properties are analyzed using Cooper-Eaton’s equation. It was clarified that the static properties were affected by the making method, squeeze speed, squeeze pressure, and sand type. From the experimental analysis, it was clear that the dynamic properties of the green sand were divided into two types the rearrangement mechanism and the deformation mechanism. The squeeze speed, squeeze pressure, and sand type affected these two mechanisms. This dynamic analysis result showed that the green sand mold with high compacting density can be obtained under the conditions of relatively slow squeeze speed and high squeeze pressure.