PCM (Patternless Casting Manufacturing) is a new technology applying rapid prototyping technology to traditional resin sand casting process. First, the sand mold model is obtained from the CAD model of the part, and the STL file of the sand mold model is layered to obtain the cross-section images and then the control information is generated by the layer details. During printing, after the raw sand properly mixed with the activator, the print head will jet binder to the sand precisely according to the cross-section images. The binder then reacts with the activator and cementation will occur immediately to make the sand stacked. The curing should be done layer by layer. After curing all layers, the sand mold is appropriately formed. Where there is no binder jetted, the sand remains loose and it is easy to clean up. By removing the uncured sand, a sand mold is ready for post-processing before casting.
