Abstract: The feed speed curve of the mandrel at the end stage of the conical ring rolling process for TC4 titanium alloy (calibrating curve) plays an important role in the geometric accuracy, temperature and strain fields of the rolled ring. Design methods for four kinds of calibrating curves which are convex, concave, ladder, and linear forms are proposed. The effect rules of four calibrating curves on roundness, thickness uniformity and temperature and stain fields of the rolled ring are explored through numbers of simulations based on ABAQUS software platform. The results show that, under the convex, linear, ladder and concave calibrating curves, the roundness and thickness uniformity of the rolled ring orderly tend to be better; the temperature distribution of the rolled ring orderly becomes more homogeneous but the temperature average is orderly decreasing; and the equivalent plastic strain distribution orderly becomes more inhomogeneous but the average of equivalent plastic strain is orderly increasing. So the concave calibrating curve is the relatively adequate selection among the above four calibrating curves for the conical ring rolling process for TC4 titanium alloy billets.

Key words: TC4 titanium alloy;conical ring parts;ring rolling;feed speed curve of the mandrel;calibrating curve;finite element(FE) modeling and simulation, CEMS, Kalman filtering, NOx, Soft sensor, Data fusion