Big Diameter Bar Two Roll Straightener Roll Shape Curve Of The Research

Iron and steel industry is an important basic industry economy，it’s animportant symbol of national economic level and the comprehensive nationalstrength.With the development of economy and society,the quality of steelproducts is also more and more high.Because of some kinds of reasons,in theprocess of the heating,rolling,cooling,heat treatment and transportation,barmay have some defaults such as bend of multi-directionds and can not meetthe use requirements.In order to get the required products,the bar mast beeliminated by straightened in the later process.As a finishing technology,tworoll straightening can significantly improve the straightening quality andstraightening work ends.The straightening quality is good or bad dependslargely on the roll shape.At present,a lot of work has been done with theresearch of roll shape curve,but there are difficulties in the domestic largediameter bars straightening,straightening equipment needs to be imported,so ithas important theoretical value and practical significance to the study of largediameter bar straightening.According to elastic-plastic bending theory of bar,this paper analysis theprinciple of the two-roll straightening.Based on the theoretical analysis ofseveral existing roll shape,this paper design the unilateral tri-curvaturereverse-bending roll.when designing,the first step is to get the curvature ofeach section of the straightening roll follow the thought of “unify first,thenstraighten”,the second step is making use of vectors’ analysis to get a set ofaccurate formula of the roll shape.With the help of Matlab,we can run a curveof every segment of roller shape,then develop straightening rollers range fromφ250mmto φ300mm.This text built3D model of the straightening process,simulated the wholeprocess of two-roll straightening dynamically by ANSYS. The characteristicsof stress and strain distribution during the two-roll straightening are obtainedby the finite element analysis to test the rationality of the design of roller shape,make some guidance for the practice.