The Study Of Forming Laws Of The Hollow Shaft Cross Wedge Rolling Based On The Finite Element Theory

Cross wedge rolling (CWR) is an emerging technology for shaft parts processing. Because it has many advantages in industrial production other processes do not have, its application has become more widely in recent years. The cross wedge rolling is mainly used in solid shaft parts. By studying on the process of CWR through using finite element method, the researchers have yielded fruitful results. Cross wedge rolling is mainly concentrated in the solid shafts, some scholars have begun to study roll-forming mechanism of the hollow shaft. For the surface of the hollow shaft inner hole is free, the changes of the inner bore are not rule as the rolling process progresses. In addition, for the workpiece requires the same inside diameter, ordinary wedge rolling processing has been unable to meet the requirements So we must use mandrel within the hollow shaft hole to ensure hole pattern. In the past yesrs, the study of hollow shaft with mandrel rolling is relatively fragmented, and there is no systematic research about it. Based on this, the subject is determined to be "The study of forming laws of the hollow shaft cross wedge rolling based on the finite element theory". The results of research can take some directive function on the production of hollow shaft parts. It can also further improve the theoretical system of cross wedge rolling in the hollow shaft parts rolling.In this article, we study the process of cross wedge rolling process by using the finite element method. Analyse several groups of cross wedge rolling process parameters. Then I built a three-dimensional rigid-plastic finite element model by using software DEFORM-3D. By the simulation of rolling process with mandrel, I get the ideal simulation results. On the basis of simulation in the rolling process, the formation mechanism of the hollow shaft parts with mandrel. Stress field, strain field, velocity field and the equivalent strain rate field the hollow shaft parts in the whole process were analyzed.Process parameters determine the rolling process. In the rolling process variables affect the final molding quality in their own ways. Select several important variables (rolling force, stress, equivalent strain injury factor) for analysis. Summarizes the laws of the variation related to workpiece quality in the different process parameters (broadening angle, forming angle to the section shrinkage). It has important significance for the choicing of the parameters in the actual production and research. Finally, Analys a set of simulation results of the hollow shaft without mandrel, and compare the differents of effect force, the equivalent strain, damage coefficient when it has a mandrel or not. A brief introduction to the rolling should pay attention to, and provides a basis for a better understanding of the two different situations.