Research On Thickness Variation With Plastic Bending Of The Plate Of Moderate Thickness

In sheet metal bending process,thickness will continue to thinning. The smaller of sheet metal bending radius, the greater of the amount of bending thinning. Therefore, in determining the size of bending rough start, it must consider the impact of thickness reduction; otherwise it will affect the accuracy of work piece after forming. On this phenomenon, many scholars have discussed related to it, and gives the number of calculations, but most subjects choose a metal thin plate. With the development of industrial technology, in particular, the development of our high-speed railway, the train used by manufacturing enterprises in the thick high-strength aluminum alloy sheet is no longer just for the body's covering, but more as a train body structure parts, so parts of the plate bending will be more and more high-precision bending process of thinning phenomenon should not ignore, so the bending plate in the development of these processes requires a clear case of its thinning.In order to improve the thin sheet metal bending theory, the author as the main object of study in order to plate, using theory, mathematical calculations, computer simulation and the specific method of combining experiment, analysis of the thickness direction on the basis of stress-strain conditions, consider the bending of sheet metal layer and the shift of the neutral layer, reference the previous ones, summed up the plate bending theory thinning formula and examples, get a lot of the theory of plate bending aluminum thinning data. On this basis, for the first time the specific properties of the material plate bending on the effects of thinning were studied and gives a simple relationship between the two formulas.The application of advanced computer simulation software-DYNAFORM, bending thickness changes were simulated, obtained thinning and specific location data, to provide reference for the test and opened thinning of sheet metal bending phenomenon of the new method. The use of high multiple micro meter, get a lot of plate bending thinning data, applied science data processing method to get accurate thinning data, the final validation of the theory, agreement is good, the final draw consistent with actual production needs, and strong operational method of calculation. This research on the development of bending process has certain theoretical and practical significance.