In our article we pursued the following goal: experimental investigation in order to determine the dependence of the geometrical accuracy of the casting mould, which is obtained with the help of the 3D-printer in accordance with the "Binder jetting" method, upon the granulometric composition of the used material, as well as upon the drop dimension of the binding agent. We have manufactured special reference models, which had certain geometrical characteristics and which required proper investigation. These samples were printed on the basis of utilisation of various sands (as concerns their granulometric composition), as well as on the basis of utilisation of various dimensions of drops of the introduced binding agent. We have performed measurements of the manufactured samples. Results of these measurements are presented in tabular form and in the graph form. The article presents results of measurements of the details, which were manufactured in accordance with the "Binder jetting" technology on the basis of utilisation of various dimensions of drops of the binding agent, as well as various sand grades. It was demonstrated that increase in the drop dimension, as well as increase in the dimensions of the powder particles result in the increase in the dimensional accuracy. Accuracy of the details, which were printed along the X-axis, differs from accuracy of the samples, which were oriented along the Y- axis. It was also demonstrated that various accuracy along various axes is caused by the asymmetric distribution of drops of the binding agent, while this asymmetric distribution is caused by the technological characteristics of the manufacturing plant. In addition, it was demonstrated that it is possible to increase accuracy of the manufactured products at the certain combination of the printing parameters (even in the case of increase in dimensions of the powder particles). Constraints of the investigation are as follows: scope of this investigation is limited by the specific materials and by equipment. Practical consequences of this investigation are as follows: the data, which we have obtained, can be used in the course of designing of the casting moulds, which will be manufactured in accordance with the method of the layered synthesis with the help of the 3D-printers.
Volume 11 | 02-Special Issue
Pages: 393-411