Influence Of Continuous Rolling Process On Quality Of Electrician Copper Rod

Electrician copper rods are the intermediate blank for producing wires and cables and widely used in the production of various specifications of wires and cables because of good physical and mechanical properties. In recent years, with the rapid growth of the national economy, technology and industry levels, the maket demands more great properties of electrician copper rods. In order to ensure the quality of products, the existing process flow is strictly controlled in the process of production. Recently, there are some problems in the process of ?8mm copper rods production of Anhui Xinke new materials Limited by Share Ltd, such as the large difference in the load distribution of the motor and the poor torsion performance of the copper rods. In view of this situation, Anhui Xinke new materials SCR3000 copper rods continuous casting and rolling production line was as the research object in this paper. The rolling process and its influence on the quality of copper rods were intensively studied.Rolling process directly determines the ability of the production equipment, and affects the final product quality. In this paper, the conjunction of material composition test, finite element simulation analysis and the method of field testing were taken to research the reason why the load distribution of the motor was different and the formation mechanism of cooper rods torsion crack. Specific content as follows:1. The type of copper rods crack was observed by SEM. The effect of the oxygen element on the torsional crack was eliminated by using the LECO oxygen nitrogen analyzer and EDS energy spectrum analysis.2. MMS-200 thermal/mechanical simulation experiment machine was used for the single pass compression test of low oxygen copper. The effect of deformation temperature, deformation extent, deformation velocity on deformation resistance of low oxygen copper was investigated, and a Johnson-Cook constitutive model which suitable for high temperature, large deformation, high strain rate was established to prepare for construction of the finite element model of pure copper material.3. A two pass continuous rolling model of copper rod was established by MSC. Marc finite element software. The effect of the different push-pull-relationship on workpiece width, damage, forward slip rolling force and the rolling torque was studied by changing the velocity difference between the frames, and this provided a good reference for analysis the simulation of multi-pass rolling of copper rods.4. A finite element model for the continuous rolling of copper rods was established with the parameters in the actual production process. Through the analysis of simulation results about temperature, stress and strain and damage, we found that there was a big difference in temperature distribution of continuous rolling process. Compared to the center, the surface was more prone to damage. By analysis of the rolling force and rolling torque in each frame,it was found that the push-pull-relationship between the frames was unreasonable.5. The torque of rolling mill drive shaft was tested by wireless remote sensing technology, and the accuracy of the finite element simulation results had been verified by the analysis of the test data. The difference of the motor load distribution in production process was caused by unreasonable push-pull-relationship between the frames. The large tension rolling would make the micro crack defects easy to be appeared in the lower plasticity part of the copper rod surface, and the torsion performance of the copper rod would be affected.