Study On The Hot Deformation Behavior Of High-ti6061Alloy And Forging Process Of Wheel

To solve the global energy problems, reduce vehicle gravity and fuel consumptionhave become another point to breakthrough for automobile manufacturers to improve theircompetitiveness, how to reduce the weight of wheels has become a hot subject in researchfacilities. As the casting aluminum alloy wheels are prone to have shrinkage and porositywhich would reduce the mechanical properties, the forged aluminum alloy wheels becomemore and more popular because of their excellent quality and unique performance. In thispaper, high-Ti6061alloy is used as the study object; start with the hot deformationbehaviour, the forging process of aluminum alloy wheels is analyzed in detail and thebetter process parameters are obtained to solve the problems of forged wheels in practice.Firstly, isothermal compression experiments of high-Ti6061aluminum alloy wasstudied to establish the high temperature plastic deformation flow stress model andanalyze the influence of deformation parameters. The result shows that: the flow stressincreases with the increase of strain rate at the same temperature; and decreases with theincrease of temperature at the same strain rate. The constitutive equation of high-Ti6061alloy was established according to the peak stress in the paper.Secondly, the three-dimensional model of forged parts and the die of wheel werecreated through the modeling software of UG. The three-dimensional thermal couplingmodel of wheel in forging process was simulated, and obtain the metal flow law, thedistribution of stress field, strain field, velocity field and temperature field and theload-displacement curve through the finite element numerical simulation softwareDEFORM-3D, according to the basic theory of rigid-plastic finite element method. Andsingle factor alternate method is used to analyze the effect of main process parameters onthe formation of forged wheels in the finish-forging process, and obtained the betterprocess parameters. The defects probably appeared in wheel forging process wereanalyzed, and possible solutions were presented to guide the practical production.