Research On Forming Technology And Simulation Of T-shaped Tube Joints

Aviation catheters are important components of the aviation hydraulic system. As thecatheter inner pressure changes frequently, catheters often burst at the connector area.Therefore, how to improve the technology of tube joint quality and parts stability becomes theprimary task of ensuring flight safety. In order to improve the quality of parts and existingforming process, the paper studies the warm tube hydroforming and deep drawing forming ofthe T-shaped tube joints.The solutions of forming a half-pipe and forming two symmetrical half pipes arecompared, in the forming process a half-pipe, when forming material stress is uneven, ruptureand wrinkling phenomenon will be find, and it is difficult to shape qualified parts. Due tostructural symmetry, the material forming flow of symmetrical two half-pipe becomes moreuniform, and high quality parts can be formed through reasonable forming technology andsuitable process parameters. Different influences of heights draw beads on the forming partsare investigated through simulation. When the height of draw bead is3mm, parts are wrinkle;When the height of draw bead is5mm,the parts have high quality; When the height of drawbead is7mm,the forming part are rupture; Thereby the determined height of draw bead is5mm. According to the manufacturer’s parts drawings he size of the working part of the moldis calculated, and the mold structure is determined.This paper studies the thermal state of hydroforming process of loading path, and takesuniformity of thickness and height of branch as the optimization target. By using oforthogonal experiment method, optimize load path, find parts for this research project theoptimal load path. The internal pressure is16MPa, the distance of left and right punch feed is12mm, and the distance of balance punch backward is22mm.Through orthogonal testanalysis three process parameters of the thermal state T-shaped aluminum tube hydroformingare analyzed, these processes include the process of the internal pressure, the distance of leftand right punches feed and the distance of balance punch backward. Studies have shown thatthe order that influence factor of the branch height is: inner pressure, the distance of left punch and right punch feed, the distance of the balance punch backward; the order thatinfluence factor of the thickness distribution is: the distance of left punch and right punch feed,inner pressure, the distance of the balance punch backward.