چكيده به لاتين
Today, in various industries, including the military and aerospace industries, food industries, and automotive industries, multilayer sheets are used to simultaneously use the properties of several types of sheets, including high strength, low density, and corrosion resistance in one structure and body. The connection of multi-layer (double-layer) sheets is usually done by explosive welding, rolling and cumulative rolling. In the mentioned industries, it is necessary to shape the multilayer sheets produced by forming processes to the desired shape and geometry. Recently, the incremental forming method of metal sheet is a new technology of rapid prototyping methods and has been greatly developed in recent years. In this process, a spherical or hemispherical tool applies local deformation in a continuous path on the sheet. This method has many advantages over conventional sheet forming processes such as deep drawing. Among these advantages are the higher formability of the sheet in this method, the production of parts without the need for a mold and the manufacture of products with complex geometry. In this research, an attempt has been made to study and investigate the incremental forming on the double-layer sheet using experimental activities. Investigating the ductility of double-layer sheets made of Al/Ti in the incremental forming process has been investigated by obtaining the forming limit diagram.
By examining the results, it was observed that the type of geometry and arrangement of the sheets had a significant effect on the degree of ductility. The highest formability and forming depth obtained in the aluminum-titanium double-layer sheet is related to the sheet formed with a conical geometry and arranged in such a way that the aluminum sheet is the outer layer (titanium layer in contact with the tool), which is compared to the double-layer sheet related to the triangular geometry and Arrangement in such a way that the titanium sheet of the outer layer (aluminum layer in contact with the tool) has increased in length and malleability by 130%. The feed rate of 1200 mm/min, spindle speed of 500 rpm, tool pitch of 0.5 mm, and tool diameter of 9 mm are among the input parameters of the experimental test, which are considered the same for all tests.
Key words: cumulative rolling, incremental forming, forming limit diagram, Al/Ti alloys
