Simulation And Experimental Study Of Radial Pressure Of The Drum Used In Aluminum Strip Cold Rolling

With the increase of people’s requirement on the production and quality of aluminum strip, the technology optimizations become more and more important for the aluminum processing. In mechanical design of the coiler for cold rolling of aluminum strip, the radial pressure of drum is the primary consideration for the calculation of expansion cylinder because it directly affects the strength of core rod and hollow mandrel. Therefore, the precise calculation of radial pressure is very important for the design and manufacture of coiler. The existing calculation formulas can not reflect the real radial pressure in practical working coiler. In order to calculate radial pressure accurately and explore its effect on coiling, numerical simulation and experiments were applied to study the radial pressure changing laws, natural frequency and the force variations of expansion institution in coiling process. The main study and results are shown as follows:Firstly, the radial pressure change of the segment and the distribution of stress-strain in the main parts like wedge in coiling process were analyzed by finite element method. Also the tests of expanding cylinder pressure were made in factory. Results obtained from simulation and tests are basically same, which show that the mathematical model and analysis method are correct.Secondly, natural frequency and critical rotational speed of the drum under resonance condition were worked out. These results can provide the design basis on preventing the drum working in the resonant zone.Thirdly, the process of initial expansion was simulated by using the software of ANSYS. The displacement changing laws of the roll surface were calculated after the drum second expanding with different layers of strip. It is found that the minimum number of strip layer is4to5when the tension of the drum becomes stable. This provides an important reference for practical operation.