バインダジェット法積層造形砂型の曲げ強度に及ぼす積層ピッチおよび樹脂添加量の影響

抄録

  In sand mold additive manufacturing applying the two-liquid self-hardening process, changes in the strength of sand molds were investigated when the layer thickness was changed from 0.30mm to 0.70mm. The strength of sand molds excluding the influence of packing fraction was more or less constant when the layer thickness was 0.6mm or less. On the other hand, when the layer thickness was 0.7mm, a significant decrease in strength was observed and the sand mold was found to peel off in the stacking direction. To obtain robust sand molds, the printed resin should penetrate to the lower layer, and the layer thickness should be 0.6mm or less. When the layer thickness was 0.6mm or less, the sand mold strength monotonously increased with increasing density of the printing dots of the resin. These findings suggest that the strength of the sand mold is expressed as a function of the resin addition amount to the power of 0.57.