Abstract
The mechanical properties of die castings correlate with the inner structure of a casting, distribution of the eutectic phases, and with the content and distribution of porous cavities in the casting volume. This submitted paper deals with the issue of the possibility to influence the basic parameters affecting the quality of castings through structural modifications of the gating system. The structural parameter under assessment is the gate height. In the case of the diverse height of the gate, five sets of castings were produced. The individual sets of castings were subjected to examination of selected mechanical properties, i.e., of permanent deformation and surface hardness. At the same time, the individual sets of castings were subjected to metallographic examination of the eutectic structure of the casting. It was proved that the gate height influences the aforementioned properties of the castings and significantly affects the ratio of the eutectic phases in the volume of the casting. The conclusion describes the mutual correlation between the gate structure, the mechanical properties of the casting, and its structural composition.
Highlights
Die casting allows production of thin-walled castings with high geometric precision, positive mechanical properties, and of low price
It was proved that the gate height influences the aforementioned properties of the castings and significantly affects the ratio of the eutectic phases in the volume of the casting
Increasing usage of castings made of aluminum alloys and high quality requirements are the reason for the possibility to predict the properties of castings already in the process of design of the casting and gate system structure
Summary
Die casting allows production of thin-walled castings with high geometric precision, positive mechanical properties, and of low price. With regards to the mechanical properties, porosity, and fineness of the crystals it is possible, to a certain extent, to influence the quality of the castings by setting the technological parameters of the die casting cycle and by a suitable structure of the gating and venting systems. Since the technological parameters of the die casting cycle as well as the metallurgical preparation of the melt were maintained on a constant level and the only variable parameter was the gate height, it can be assumed that by means of the correct design of the gating system and especially of the gate it is possible to modify the mechanical and structural properties of mutually correlating castings. Through examination of the causes of the change of the eutectic structure of the casting by utilization of a simulation program MAGMASOFT 5.3, it was proved that the change of gate height influences the technological parameters of the die casting process
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