Theoretical analysis of roll profile by a two-roll straightening technique: greater straightening and lower residual stress technology of bar products II

摘要

Two-roll straightening of bar products has become popular because greater straightness and lower residual stress are obtainable, and the polishing effect occurs, which are frequently demanded by customers in the automobile, precision machine and office automation industries. However, the technology is not yet advanced, and the method still relies on the experience and perception of artisans. The goal of this study is to develop a method to obtaining an optimal roll profile, considering the deformation features of the bars based on elastoplastic theory. A simulation program has been developed, which evaluates roll profiles with respect to straightening effects and the effect of residual stress reduction. Through a series of simulations, it is found that traditional rolls have essential faults. Moreover, the residual stress is calculated using the simulation program, and it is shown that residual stress is seriously influenced by the roll profile. In addition, some roll profiles are analyzed and evaluated, and the optimal roll profile is proposed.