Study On Squeeze-spinning Forming Force For Magnesiu Wimth Inner Tendon Shell

Lightweight has been the development tendency of equipments like space flightand aviation, weapons, ships, energy sources and transportation etc so far. Mg-alloy isthe main material for lightweight, and inner tendon shell is a kind of lightweightconstruction. Inner tendon shell of Mg-alloy adopts to process technology methodslike casting, welding and cutting. However, products have low strength, bad precisionand high rejection rates through these methods. What’s more, researched technologymethods such as ball spinning and spinning from inside and outside limit the heightof tendon, which is difficult to meet the demand of lightweight of equipments.Aiming at the shape features of inner tendon shell and combining with moldingfeatures of Mg-alloy, a new molding craft is came out on the basis of existingproblems, and that is squeeze-spinning of Mg-alloy with inner tendon. Squeeze-spinning working principle is to finish the entirety plastic forming of inner tendonshell, and its purpose is to realize high quality and low-cost by peripheral turning ofblanks and radial feeding of extrusion wheel. So it is of great significance.On the base of analyzing squeeze-spinning forming of inner tendon shell, thekey technologies, such as the definition of contact and friction, meshing problem, andconvergence criterion have been discussed in the process of modeling according toFEM theory. Simufact is chosen as the FEA software to build three-dimensional FEMof magnesium with inner tendon shell.The distribution draws of stress and strain and the flow rules can be studied andproblems like unstability and wrikles in forming process can be analyzed throughnumerical simulation. All those above are in order to confirm the main processparameters.Theoretical equation of squeeze-spinning forming force can be deuced bygraphical method and energy method. The simulation analyzes the effects of mainprocess parameters such as diameters of squeeze-spinning wheels, thickness reduction and temperature on the squeeze-spinning force and the forming height ofinner tendon.Choosing certain inner tendon shell, aiming at minimum forming force and highheight of inner tendon, the simulation analyzes the effects of squeeze-spinningforming of Mg-alloy’s inner tendon shell with different process parameters. Theoptimized forming processing parameters and the order of the parameters that affectprimary and secondary on parameters can be obtained by orthogonal experimental,which provides the theoretical basis for squeeze-spinning forming process design ofinner tendon shell and parameter optimization.