Roll gap per rotation optimization in a radial ring rolling process

In this paper the authors tested the influence of the roll gap per rotation (RGpR) on different rings characterized by different ratio between ring width and height (W/H). The roll gap per rotation was identified by the ratio between the Idle roll feed and the angular velocity of the ring. In order to have a constant angular velocity of the ring the authors proposed an innovative approach designing a Driver roll speed law as a function of the ring diameter expansion to obtain a constant ring rotational speed and control the ring deformation. Under these constrains different Radial Ring Rolling processes have been simulated imposing three different level RGpR and W/H. Results have been analyzed by geometrical and physical point of view to identify the best set of RGpR and W/H. Based on the results a second numerical campaign have been simulated to test the effect of three set of ring angular velocities and Idle roll feed having the same RGpR. Results highlight interesting information to correctly produce a ring with lower forces and energies.