Study On Controlled Rolling Of Titanium Alloy Ring

With the trend of promoting technological revolution, more and more titanium alloypenetration is used in areas of industrial technology and scientific techniques, which hasbecome the third important metal following metal alloy. With the excellent mechanicalproperties, small proportion and high intensity, Titanium alloy has been one of the idealmaterials for the aerospace industry. Titanium ring has been widely used in the aerospacefield. With the rapid development of technology of the aerospace and related fields, therequirement for large-diameter titanium rings is growing. But titanium has a narrowtemperature range of rolling and rolling deformation temperature has a great impact tothe resistance of titanium alloy. As a result large-diameter titanium rings can be stop withthe temperature decreasing during the process of ring rolling. The increasing deformationresistance results in a sharp increase in the rolling force and the rolling torque. Ususallythe ring needs a secondary heating or many times heating process to matain the rollingprocess. The method is inefficient and low-quality. If the rolling speed is slow, the ringwill produce large deformation heat in the rolling process of small titanium ring. As thethermal conductivity of titanium is weak, a lot of heat will lead the local temperature tobe too high to destroy the existing organization of the ring, where the final quality isaffected. To solve the problem above, we proposed the temperature control rollingmethod.In this paper, to achieve the goal of controlling temperature rolling of titanium ring,based on the existed theory, bit conditions, forge through conditions, rigid-plasticconditions, the feed speed and movement of the guide rollers of the ring rolling have beendiscussed. According to the theoretical of heat transfer theory, the transient temperaturefield model of ring rolling have been established, the factors of the transient temperaturefield has been analysed.Based on the finite element method, the3D finite element model of TC4ring rollingwas constructed by using DEFORM software. Research the law of temperature changing of ring rolling and the theories of how to control the temperature during rolling. Designthe parameters of experiment to direct the by this theory. To proving this theory bysimulation depend on the finite element software DEFORM. Finally, take a actual ringrolling experiment in a factory. Using the theory of temperature controlled rolling in thispaper design its parameters. Make simulation on DEFORM to predict the result andproduct with D51ring rolling machine, extracting temperature on the surfaces of ring indifferent orientation. Compare the experimental results between simulation calculatedand actual production experiment for further validate the theoretical of temperaturecontrol ring rolling.