Research On The Rolling Pass System Of C And F Profiled Steel Bar For Bridge Expansion Joints

Numerical simulation of plastic forming is an attractive field of enormousimportance to the economies. With the development of finite element technique andcomputer technology, numerical simulation has been an effective tool in processanalysis and optimal design for plastic forming. In this thesis, pass system of C and Fprofiled steel bar for bridge expansion joints was studied with finite element method(FEM) via DEFORM-3D. The thesis mainly includes the following contents.1. Plastic deformation process of C and F profiled steel for bridge Expansionjoints in pass system was simulated by FEM. Results of numerical simulation showthat the uneven compressing coefficient of thickness of two sides of the pass andnon-simultaneous contacts between roller and parts of rolling billet will destroy thestability of rolling billet and reasonable distribution of materials and cause ear andscarcity of material;pre-bending angle and angle between profile of pass and parts ofthe billet to be bended are critical to the effect of bending forming;and the difficultyof the design of pass system for profiled bar for bridge expansion joints lies in thecontrol of angles in pass of bending forming.2. Both rules and influential factors of plastic deformation in rolling arediscussed. It is shown that friction has a great impact on biting-in in rolling, whilelittle on bending forming;size and shape of outer ends, roller, and rolling billet aresignificant to the deformation and stress distribution in rolling process;increasingroller diameter, reduction rate, and shear friction factor are helpful to gain a greaterforward slipping value;forward slipping value varies inversely with the increasing ofthickness of billet post rolling in a certain range;for plain roller rolling, widespreading zone and stretched zone are clearly manifested in deformation area.3. The resultant rolling torque from FEM simulation is in consistent with realrolling process. The internal temperature field of rolling billet is obtained through heattransfer coupled simulation of plastic deformation in rolling.4. By comparison of product structure and rolling characteristics of the C and Fprofiled steel bar, rules in pass system designing of profiled steel bar for bridgeexpansion joints were summarized. It can be believed that the product series ofprofiled steel bar bear similarities in structures and rolling characteristics. The passsystem of C profiled steel bar is the base template of F, E profiled and other profiledsteel bar's. Therefore, research on rolling rules of C profiled steel bar is important todevelopment of product series of profiled steel bar for bridge expansion joints.