The Research On The Isothermal Rheological Forming Of The Titanium Alloy Compressor Disk Of WZ9 Helicopter

Recently, the theory and method of rheological forming, a theory and method of greater universal significance, has inherited and developed on the basis of the theories of classic plastic forming. It is being widely accepted and applied to scientific research as well as production practice, coming to show its strong vitality and practical prospect.Taking practical production of TC 11 titanium alloy compressor disk as an example, titanium alloy is regarded as a kind of visco-plastic material whose constitutive relationship is initially introduced, thermomechanical coupling and irreversible thermodynamics analyses have been carried out for irreversible thermo-rheological forming process.In this paper, the numerical simulation on the isothermal rheological forming has been conducted, which includes the numerical simulation of the isothermal field, equivalent strain field, press force curve, forming process figures and velocity field, etc.. All the results of the numerical simulation have been analyzed. For example, partial results of numerical simulation for isothermal field during forming process proved relevant content of thermodynamics analysis. Because the material of TC 11 titanium alloy is sensitive to forming temperature and strain rate, however, the range of forming temperature is very nan~ow, it is bound by heating norm, after the influence of the same forming temperature and various strain rate on simulation results is compared, we have gotten idealer program and optimized production technology.The experiment on resistance of deformation during rheological3fonning process has been carried out in this paper, and it is compared with the extrusion force curve of simulation results, though there exists a little error, it proves that the simulation results are correct.Furthermore, the creep experiments under high temperature have been done on TC 11 titanium alloy. The integral creep constitutive equation and differential stress-strain constitutive relationship can be established according to relevant rheological model. Besides, error between the results conducted from the theory of creep equation and obtained from experiments has been analyzed. Furthermore, the coefficient y((b(F)) in close relationship with viscosity of material can be achieved through visco-plastic constitutive equation and creep experiments?data, too.Finally, experiments have been done to show the low-powered flow line as well as the microstructure of the product material, the mechanical properties and thermal stability of the rheological forming part have also been tested. The experiments show that the product part produced by rheological forming method has excellent mechanical properties, its surface is smooth and beautiful, and the low-powered flow line, chemical components can meet the requirement of YJ0054. Comparing with other technology methods, it minimized the consumption of raw material, optimized the machining procedure, and saved the cost of production.