基于喷墨3D 打印的铸造砂型(芯)成形工艺参数应用研究

This work investigated the effects of the used sand proportion, forming process parameters (print-layer thickness and resolution in the X direction) on the tensile strength of the mold/core by means of the orthogonal experiment method. The results show that the tensile strength of the samples decreases with increasing the used sand proportion, and the tensile strength and loss on ignition gradually decrease with increasing the layer thickness. The resolution in the X direction is related to the binder content, and with decreasing the resolution, the binder content increases, and thus both the tensile strength and loss on ignition also increase. In addition, the layer thickness has significantly stronger influence on the tensile strength, following by the resolution in the X direction and the used sand proportion. The optimal parameters are 30% used sand, 0.28 mm layer thickness, and 0.09 mm resolution in the X direction. The mold/core printed using the optimal parameters can meet the requirements well.