حامد اسمعيلي ايوانكي

The V-bending process is recognized as one of the most common an‎d widely used sheet metal forming methods, playing a vital role in various industries, particularly in the automotive sector. However, one of the main an‎d unavoidable challenges in this process is the phenomenon of springback. This phenomenon occurs due to the release of a portion of the elastic strains stored in the material during deformation after the removal of the load (removing the part from the die). The result of this phenomenon is the deviation of the final bend angle from the die angle, leading to reduced dimensional accuracy an‎d problems in the assembly of parts. On the other han‎d, the continuous deman‎d from industries for materials with superior strength an‎d mechanical properties has always been a driving force behind the development of new material production technologies. In this context, cumulative rolling has been introduced as a novel, cost-effective, an‎d practical method for severe plastic deformation, producing materials with ultrafine an‎d nanostructures, which significantly improves mechanical properties, especially yield strength. The main objective of this research is to experimentally investigate the springback phenomenon in aluminum-copper multilayer sheets produced by the cumulative rolling method. After the rolling process, the samples underwent annealing treatment. To examine the effect of anisotropy caused by the process, the samples were cut at angles of 0°,45°, an‎d 90° relative to the rolling direction, an‎d V-bending tests were performed at die angles of 60°, 90°, an‎d 120°. The results showed a significant dependence of springback on the sample orientation an‎d die angle, with the highest amount of springback observed in samples oriented at 90° an‎d a die angle of 120°. Tensile test data confirmed the presence of mechanical anisotropy. Annealing resulted in reduced strength an‎d increased ductility, leading to a significant decrease in springback under all conditions. This study provides an effective solution for controlling springback in the forming of high-strength multilayer sheets.

نورد تجمعي‌ , شكل‌دهي‌ فلزات , برگشت‌ فنري‌ , خمش‌ V شكل‌ , ورق ريز دانه شده

Accumulaative Roll Bonding , Metal Forming , V-Bending , Springback , Ultrafine Sheet

Hamed esmaeili ivanaki

Ramin hashemi