Numerical Simulation And Experimental Study On Cylindrical Torsional Compression

In term of nuclear power and hydroelectric power which need large forgings industries, demand for large forging metals is growing, many large components are required to be adapted to different environment or various stress distributions. Fundamentally speaking, materials are asked to have better micro structure performance. Large engineering components are often considered as the first important process during forging, in order to improve the micro structure performance or heal macro defect. Different materials and complex shapes pose much more of a challenge for forging process.In this article, the possibility of replacement of traditional upsetting process by the twisting compression is explored. The influence of the twisting angles, friction factors and different experimental materials affecting the twisting compression process of forging is analyzed. At the same time, a characterization of torsion effect quantity- torsional efficiency is defined to combine torsion efficiency and grain sizes to study the effect of twisting compression process in the quality of forgings. First of all, DEFORM 3d numerical simulation software is used to study Q345 e steel in the twist compression process simulation. The influence of friction factors and torsional angles affecting twisting compression process is analyzed. The results show that when the friction coefficient is from 0.4 to 0.7, torsional efficiency can reach 80%, torsion angle is subjected to the friction factor; Moreover, compared steel grain sizes with lead grain sizes in the twisting compression process, it can be found that under the same experimental condition, grains of the lead sample is easier affected by twisting than grains of steel sample, lead’s hard deformation zone is 10% smaller than steel’s zone, large deformation area is 13% greater than steel’s area. Finally, by the means of the finite element method to simulate the dynamic recrystallization of Q345 e steel, the results show that core dynamic recrystallization occurs completely, dynamic recrystallization of the circumference does not occur completely, and dynamic recrystallization does not occur in the mold surface.