Abstract
The computer-aided development of the leveling technology for high-strength steel flat sheet products is the primary goal of the research. The roll leveler setups are evaluated from the final product point of view with an acceptable flatness level and stress state at the same time. First, a reliable hardening model is developed based on experimental and numerical investigation. The combined isotropic-kinematic model is selected to capture material behavior under cyclic loading conditions. The inverse analysis approach is used for the high-quality model parameters identification stage. Then the roll leveling process for a wide range of machine setups is simulated using a finite element model. Examples of results in the form of final flatness and stress distributions are presented within the work. As an outcome, a set of process parameters is identified that provides a good quality product for both investigated criteria.
Highlights
Increasing quality requirements from the modern automotive, machine, or railway industries force manufacturers to deliver components with strict geometrical tolerances
The computer-aided technology design was used in this work to evaluate the capabilities of the roll levelers in application to the leveling process of the high-strength steel sheets
The reliable hardening model based on the combined isotropic-kinematic approach was developed first using the inverse analysis technique
Summary
Increasing quality requirements from the modern automotive, machine, or railway industries force manufacturers to deliver components with strict geometrical tolerances. The reason for that is the Bauschinger effect [11], which reflects a transient decrease in the work hardening rate due to the occurrence of a significant change in the loading direction In this case, when the processed material is subjected to loading under tension, the yield stress (σt) occurs at some specific level. The most accurate approach is a combined model type, which couples the mentioned isotropic hardening model with the kinematic one The latter can include the effects of cyclic changes in the loading direction as the center of the yield surface is no longer fixed and can move across the stress space (Fig. 2c). The guidelines for the roller leveling operation can be formulated to deliver good quality products
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
