Pure Copper Large Deformation Asynchronous Roll Numerical Simulation And Process Optimization Design

The material with ultra-fine grains not only has an excellent ductility, fatigue strength and thermostability, but also exhibits the good work ability. The AARB(Asymmetrical accumulative roll-bonding) is an effective way to obtain the bulk material with homogeneous ultra-fine grains by severe plastic deformation without alteration on dimensions of the sample.At present the process of AARB studies have achieved some results. However, the parameters of accumulative roll process not very clearer, especially in influence of asymmetrical ratios for large deformation accumulative rolling prepare ultrafine-grain and the formation of ultra-fine grain. Many experiments to verify have existence of expenditures and the heavy workload. In this paper, FE simulation was applied to optimize the process parameters to analysis problem of that.In this paper,600℃×60min annealing TU2 copper for AARB, and simple analysis the mechanical properties change of different low-pass reduction. Measured and calculate roll force of AARB respectively, the result indicate that one pass measured roll force is very close calculate. Explain the process of selecting the parameters of the calculation is more accurate, and for the simulation parameters such as friction coefficient selection provides the experimental support.Set up three-dimensional finite element model, used of finite element software DEFORM-3D simulation of the process of AARB. To further explore copper deformation behavior in the process of AARB preparation of ultra-fine grains sheet. Find out the copper in AARB at the time of stress, strain, strain rate, temperature and metal flow size and distribution as well as their preparation of the impact of ultra-fine grains copper. Identified copper regional grain refinement by tensile stress and shear stress distribution of the AARB process.Find asymmetrical optimal ratio of 1.15 by study the effects of different asymmetrical ratios over the course of the grain refinement, rolling force and shape of accumulative roll copper. Access to a better AARB process parameters and program for the development of technology has provided technical support by study rolling temperature and deformation degree and deformation rate impact of twist roll zone shear stress and effect strain and effect strain rate and rolling force of AARB.