Experimental and Finite Element Investigation of Forward Slip in Rod Rolling and the Influences on Rolled Bars Process

Abstract

Phenomenon of forward slip during the rod rolling occurs due to the fact that roller and rod are moved. Over forward slip causes elongation and often compaction in the rod and also failure in the end manufacture of the rod. In this investigation, by employing finite element method, a three-dimensional simulation is performed on the No-Twist mill process in the rod rolling. Some notable points such as the geometry extraction of rolling line of end product, rod velocity during rolling, neutral angle, height on neutral plane, and forward slip in No-twist mills are studied. Furthermore, an investigation of influential parameters such as coefficient friction between the roller and the rod, initial velocity, initial rod temperature, and the roller rotation velocity on the forward slip are carried out. Eventually, the contour of stress and temperature distribution during the rod as well as in rolling path is studied. Moreover, in order to obtain the mechanical properties of desired steel, the standard models of hot tensile experiment are performed. In addition, in order to attain the different strain rates, a simple tensile experiment are performed. It can be concluded that as the strain rate increases, the yield point and the ultimate tensile strength point increases and decreases, respectively. Moreover, the modulus of elasticity decreases by increasing the temperature. In addition, three-dimensional simulation of rod rolling in No-Twist mill process, a discussion on the simulation results, and computation of forward slip and other parameters were done by ABAQUS/Explicit v.6.14 software.