The Numerical Simulation Of The Teetube's Hydroforming

The machinery technology of forging teetuhe is making use of circular tube blank and gain tubular components . It is an innovative technique. The machining technology of forging tee tube requires the forging parts mass light, intension high, cost little and machining exactness. So it is the important aspect in 21 century in the forging and machining fields. And so the technology of tube bulging forming is being the important issue.This paper' s intention is solving difficult problems of the low-carbon steel, big diameter and thin wall teetube' s bulging forming. With testing result by Xian Heavy Machinery Research Institude, and establish a three-dimention teetube hydroforming model. Then use finite element simulation technology , applied five geometry model and load model, then simulated the process of teetube bulging forming. So we get the how hydroforming measure and technological parameter effect the stress, strain, distortion and tube wall thinning. These results are the base of the teetube hydroforming technological parameter. This paper' s important content and production are:1. By analyzing the hydroforming theory, hydroforming process and technological characterislic deeply, the mechanical model was established. Then the formulary of shaped force was deducted by important-stress measure. These are the good base for teetuhe hydroforming process.2. By studying finite element numerical simulation technology deeply, choosing reasonable parameters such as frictional condition, contact condition, time steps and convergence criterion, three-dimention elastic-plastic finite element model was established.3. By utilizing the model above-mentioned, two different, types of loading were employed: internal pressure load only and combined internal pressure and axial loading. The effects of friction and Lube thickness variation are examined, and do formal ions, stresses and tube1 thinning/thickening behaviour in the formed component are presented.Analytical results indicated that when 20 steel was being hydro-formed,we had better apply combined internal pressure and axial loading. We had better minimize the friction coefficient to the least value, at the same time insure the branch-tube achieved the most value. We had better make transitional circular-angle radius achieve the most value within the permission. We had better make tube thickness achieved the most value within the permission, too. These results supply the credible theoretics bases for the practices.