Study On Compound Bulge Forming Process And Experiment Of Multi-branch Tubes Using Rubber

Tube internal high pressure forming technology has the characteristics of structurallightweight and flexible processing. It has become one of advanced manufacturingtechnology important research director in the21st. Compared with traditionalmethods such as welding, machining and casting, not only to improve productionefficiency, but also to improve the characteristics of high strength and precision ofproduct. This study used a T-shape tube as investigated target, to research tubebulging process which use polyurethane rubber medium. Because of the multi-branchtube bulging process is a complex process along with nonlinearity. So, researchprocess parameters, mold structure parameters and the coupled interaction influencethe tube bulging process, which combination of numerical simulation and bulging testmethod.The finite element model of T-branch tube bulging was established, whichuse polyurethane as medium. A new die surface which was made by scanningwas used in the bulging process. And its advantage was proved. Poly-linesfeed method with finite element simulation was used to optimize the loadingcondition for tube bulging process which use polyurethane rubber medium.The results indicate that poly-line loading path was more advantage thanlinear loading path. When the poly-line loading path was adopted, theT-branch bulging quality was improved, especially the tube wall distributionis more uniform and the branch is higher. The slope punch and polyurethaneare proposed, and to research those different structure impact of the T-branchtube compound bulging. The results indicate that tube wall thinning rate firstreduced and then increased, the thickening rate is gradually reduced, with the slopepunch oblique increase. With the rubber oblique increasing the tube wallthinning rate reduced and then increased. Use orthogonal design to study therubber bevel angle, axial punch bevel angle, the counter punch’s start timeand initial height, displacement feed and their interaction to affect the forming quality and to optimize the best parameters and the loading path.