چكيده به لاتين
The lattice structure is a subset of cellular materials. For this structure a unit cell is defined in terms of its repetition in the coordinate directions of the final shape. This structure is a part of regular cellular material and the main difference with irregular cellular materials such as metal foams, is predictability and the ability to improve its properties. In this research, for the study of the effect of casting variables and mechanical properties of lattice structures, a wedge-shaped cell was used and this unit cell was repeated in cylindrical coordinates to form the final structure. The AL413 alloy was selected due to high fluidity in this research. At first, the muscle model was designed by the software and was built with 3D printer. From this model, a silicon mold was made and sand cored model was made in it. With the placement of these cores together and surrounding them by sand, the final mold was prepared. Structures with relative density of 0.15, 0.25 and 0.35 were designed and constructed. The effect of relative density and arrangement of unit cells on the compressive strength of the structure was investigated. It was observed that with increasing relative density in R-structures from 0.15 to 0.35, the compressive strength increased from 24 MPa to 54.6 MPa. Also in M-structures, with increasing relative density from 0.15 to 0.35, compressive strength increased from 7.6 Mpa to 17.6 Mpa. From the die casting parameters, the mold temperature is selected and simulation of two overflow and sinking systems was performed. For practical operation, the overflow system with a mold temperature of 25 and 400 ° C was selected and it was observed that a pre-heating is required to reach a safe sample.
