Abstract: By means of the software of ANSYS, the numerical simulation of the new theory of upsetting a block with square transaction between flat platens is carried out. Both the relationship between the shape of the rigid region and the reduction in height and the relationship between the deformed shape of the block and the reduction in height are described quantificationally. Based on the analysis of the relationship between the distribution of stress and strain on the longitudinal center section and the dimension parameter l/h, the rigid-plastic mechanical model for upsetting a block with square transaction is verified quantitative, the point with the highest tensile stress is located and the minimum of the dimension ratio l/h with which there is no tension at the point is obtained. All the results lay a quantitative theoretical foundation for further studying and designing technologic parameters of upsetting and stretching technology.

Key words: Block with square section, Numerical simulation, Rigid region, Strain, Tensile stress