نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی بیرجند
2 استادیار گروه مهندسی مکانیک دانشگاه صنعتی بیرجند
3 گروه مکانیک، دانشکده مکانیک و مواد، دانشگاه صنعتی بیرجند، بیرجند، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Spring back is one of the common defects in metal forming processes, especially in the bending process, which occurs due to the release of elastic strains after loading. To minimize or eliminate this phenomenon, new methods such as pulsed electric current and electromagnetic forming are used. In this study, the use of magnetic field to reduce the spring back is used for the first time. The research was conducted on 1050 aluminum alloy and it was observed that magnetic field causes the reduction of spring back. Performing the tensile testing, it was determined that exposing the magnetic field, during the plastic deformation, causes the increase in the strength (i.e. the flow stress). So, the existence of a plastic region with higher strength in the neighborhood of the elastic region was distinguished as the reason of the reduction in the spring back. Moreover, the effective parameters on spring back, including sheet width, mandrel speed and rolling direction were investigated for both cases of with and without exposing the static magnetic field. Response surface method was used to express the spring back as a function of these parameters and analysis of variance was used to investigate the effectiveness of theses parameters. It was determined that the magnetic field can reduce the effectiveness of the rolling direction and spindle speed on the spring back of the studied sheet in bending; while, it has no effect on the effectiveness of the sheet. Finally, the change in the mechanical properties described by the magneto-plastic effect.
کلیدواژهها [English]
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