Development of a printhead adjustment device for robotic systems for layer-by-layer printing of foundry molds

Cold-curing mixtures molds have been given a new boost in additive manufacturing due to their high curing rate at room temperature. These molds are made by applying a layer of a mixture, usually consisting of silica sand and a catalyst, to the work surface. Inkjet printing then uses a 3D printer to apply a binder to the layer, forming a solid pattern on the layer. Since inkjet printing technology for casting molds is widely used, many companies are developing more efficient binders. Changing the binder composition requires readjustment and calibration of the print heads. It is not feasible to carry out various studies directly on the equipment for direct digital production of foundry molds, so there is a need for specialized installations. This article describes the development of an installation for adjustment, calibration and test printing of print heads, which performs two basic functions: viewing and analysis of falling drops and test printing. The design solutions of the unit are discussed in detail, the important components of which are the observation station, the control system of the unit, and the cleaning station. A high-speed camera will be used for viewing and analyzing droplets. With the help of the developed setup it is possible to carry out adjustment of print heads of robotic 3D printing systems.