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The calculation of process parameters

To box parts with flange drawing forming limit calculation, due to the parts, according to stamping manual calculation, assuming that the fuel tank nakedness is 352 mm * 118 mm * 118.5 mm, width of flange is 11 mm, symmetrical ladder box shaped parts, by reason of the hypothesis tank nakedness not a stretch forming, then combined with highly symmetric wide flange, more cannot pull a forming a fuel tank to uncover her nakedness. If divided into secondary flange box drawing, is the first time box a depth of 78.5 mm, the depth of the second box parts for all people's congress (NPC) is less than 43 mm, and the calculation of the fuel tank to uncover her nakedness tensile force is smaller than the bearing capacity of force transmission area, so divided into secondary stretching technology is completely feasible, but the tensile coefficient of every working procedure must be accurate calculation.