Study On Size Effect And Numerical Simulation In Pure Al Variable Thickness Micro Flexible Rolling

Due to the rapid development of MEMS and electronic information industry,the demand what market for micro parts in high-precision is increasing year by year,and the standard of accuracy is also increasing.In the process of micro forming,the size effect is undoubtedly an important factor affecting the accuracy of machining and processing efficiency.Due to the appearance of the size effect,some mechanical quantities which are independent on size in the traditional plastic processing theory show are dependent on size,so it is necessary to study the size effect in micro forming process.In this paper,the size effect of pure aluminum sheet in the process of variable thickness and micro rolling is studied in the laboratory,The effect of size on the deformation behavior of pure aluminum in variable thickness micro rolling process is studied by variable thickness micro rolling experiments and numerical simulation.The reliability of the simulation results is verified by experiments.The main results are as follows:(1)With the grain size increases gradually,the elongation and tensile strength of pure Al sheet decrease gradually.(2)With the increase of grain size,the edge deformation is becoming more nonuniform,the edge bulge is more and more obvious,the uneven spread increases.(3)With the increase of grain size,the rolling force which the deformation needed decreases.(4)With the increase of size of samples,the elongation and tensile strength of pure Al sheet increase.(5)With the decrease of samples size,the edge deformation is becoming more nonuniform,the edge bulge is more and more obvious,the uneven spread increases.(6)With the increase of samples size,the rolling force which the deformation needed increases.