Study On Rolling Force Model For High Strength And Low Elastic Modulus Of The Metal Plate

As it has many excellent properties,such as high strength、 low density、strong corrosion-resistance and heat-resistance、non-magnetic, etc. Titanium and its alloys attract more and more people’s attention in recent years, It is called "third metal" and "strategic metal" after steel and aluminum. It has been widely used in various industrial fields. Due to its high strength, low elastic modulus and precise rolling difficult, the "see while rolling, rolling over and over again" way is adopt for thickness and flatness control in the current rolling process.The production efficiency is very low. Rolling force is an important parameter in cold rolling process as the accuracy of rolling force directly affects the strip flatness and thickness precision control, while which is the basis of actual rolling, thus improving forecast accuracy of rolling force has important significance for improving the efficiency and precision of the strip flatness and thickness.In this paper, first of all, a typical TC4(Ti-6Al-4V)alloy as the research object, specimen precise chemical composition are measured with X-ray spectrometer. The stress strain curve is measured with electronic universal testing machine. Setting up the Rolling model in the ABAQUS finite element software, simulate of different rolling parameters(the roll radius, the friction coefficient, the incoming thickness, the reduction rate, the front tension, the after tension) for the influence of the deformation zone composition、contact arc shape、 rolling pressure distribution, getting the basic law of high strength、small elastic modulus of the metal strip during cold rolling.The second, based on the simulation law and elastic plastic deformation theory, high strength、low elastic modulus metal strip three districts(the entrance elastic compression zone, the plastic deformation zone and the export elastic recovery zone)the equation of contacts arc shape and rolling pressure distribution model are deduced during rolling.Once again,TC4 rolling experiment are done in the two-roll mill.Comparing the cold rolling force formula which is commonly used in engineering(M.D.Stone formula and Bland- Ford- Hill formula) calculated value with the experimental value,result isn’t in good agreement, illustrating common cold rolling force model is not applicable to high strength、 low elastic modulus of metal strip rolling force calculation. Comparing rolling force model derived in this paper with the experimental values are in good agreement, improving the rolling force calculation accuracy obviously.The last,the relationship of strength、elastic modulus with elastic recovery of the exit metal strip are Simulated. From the bounce equation perspective to consider elastic recovery for the influence of thickness after rolling,gives accurate setting equation of unloaded roll gap with considering elastic recovery of the exit metal strip, providing effective tools for improve the efficiency of finite element simulation and the actual rolling.