چكيده به لاتين
The single-point incremental forming process of sheet metal is a method for rapid prototyping of parts with various shapes, which leads to cost and time savings due to the high flexibility of the process. On the other hand, due to the increasing demand for metal composite materials in manufacturing industries with unique properties, it can be estimated that in the near future, we will see the widespread use of multi-layer metal sheets with better properties than single-layer sheets.
In this research, for the first time, the formability of an aluminum-titanium-aluminum three-layer metal sheet has been studied using the forming limit diagram extracted in the single-point incremental forming process. In the present study, 1050 pure aluminum sheets and commercially pure titanium sheets were joined together using bonded cold rolling, and three-layer Al/Ti/Al sheets were obtained. Then, to investigate the effect of the parameters of feed rate, vertical pitch, and tool diameter on the experimental forming limit diagram, the minimum thickness of the sheet, and the maximum angle of the forming limit, the forming process was applied to the sheet using a numerical control milling machine. Also, to draw the diagram of the forming limit, the sheets are gridded in a circle using an electrochemical engraving machine. After applying the process, the main and secondary strains were obtained by measuring the diameter of the ellipse. Investigations carried out in experimental tests were also studied using the finite element method by Abaqus software. To validate the numerical results, they have been compared with experimental data.
By examining the results in both numerical and experimental modes, it was observed that the tool diameter parameter had the greatest effect on the sheet formability. With the tool step increase, the sheet's formability decreased, but the feed rate did not significantly affect the formability. The highest amount of formability and the depth of the obtained shaping is related to the formed sheet with a tool diameter of 9 mm, a feed rate of 500 mm/min, and a tool pitch of 0.2 mm. Also, the lowest formability and forming depth are related to the tested sheet with a tool diameter of 12 mm, a feed rate of 700 mm/min, and a tool pitch of 1 mm.