Numerical Simulation Study On Forming Process Of Large TC4Alloy Cylindrical Component

This paper study on large titanium alloy cylinder component which is used in the offshoreplatform. In view of the stamping forming process characteristics of titanium alloy sheet metal, thenumerical simulation analysis on the hot forming process of TC4sheet metal was made by using thefinite element numerical simulation software Marc. In order to optimize the hot forming process, thedeformation temperature, punch velocity and friction coefficient of stamping forming is divided intogroups for numerical simulation. Base on the numerical simulation results and research on theequivalent stress, equivalent strain, thickness distribution, load-stroke curve and residual stressdistribution, get the conclusion below:(1) The deforming temperature by650℃increases to750℃(punch velocity of0.1mm/s,friction coefficient of0.2): The equivalent stress of the middle sheet by30.9631.92MPa decreases to14.14-14.67MPa before unloading, the residual stress decreases to0.374-2.679MPa after unloading.The maximum equivalent strain decreases while the minimum equivalent strain by0.03409mmincreases to0.03481mm. The biggest sheet thickness by10.04mm decreases to10.03mm, and thelocal thin sheet metal reduced. The difference value between the maximum and minimum equivalentstress decreases, which is the same for the residual stress, equivalent strain and sheet thickness. Themaximum load by460KN decreases to210KN.(2) The punch velocity by0.1mm/s increases to2.5mm/s (deformation temperature of750℃,friction coefficient of0.2): In the middle sheet, the uniformity of equivalent stress distributionincreases, the minimum equivalent strain by0.034mm decreases to0.02743mm and the differencevalue between the minimum and maximum equivalent strain by0.0188mm increases to0.04005mm.The difference value between the maximum and minimum thickness by0.14mm increases to0.29mm, the uniformity of thickness distribution intensified. And the maximum load by330KN increasesto360KN. The punch velocity by0.1mm/s increases to0.5mm/s. The residual stress differencevalue of the middle sheet by3.055MPa increases to6.078MPa and springback of sheet will increase.(3) Deformation temperature and punch velocity have greater effects on the equivalent stress,equivalent strain, residual stress, thickness distribution and the load of TC4alloy sheet hot formingprocess than friction. Get the best forming condition: deformation temperature of750℃, the punchvelocity of0.1mm/s and general lubricants.(4) The hot forming mould design of TC4alloy sheet is analyzed in detail and according to the material and structure characteristics of mould use1Cr18Ni9Ti stainless steel as mould material.Before the design of the mold the residual stress is analyzed of the sheet metal residual stress and getthe strain capacity=1/5334≈0.0001875. The springback strain is little that the springback of sheetdon’t be considered. Draw out the three-dimensional mold figure.