Simulation of the Forming of Large Double Curvature Parts on Contact-Type Shot Peening Installations.

Shot peening forming (SPF) is an effective technological technique for forming a contour of double curvature of large-sized low-rigid parts. This technique, in combination with press bending or bending–rolling, makes it possible to form surfaces of double alternating and (or) sign-constant curvature. To date, the Russian technology of combined forming has been tested in production and has special equipment and a number of methods for determining the operating process parameters. However, the existing methods have assumptions related to the specific features of processing with contact-type shot peening devices, which lead to a significant decrease in the calculation accuracy. The influence of technological heredity during the formation of the state of stress (SOS) of a workpiece requires an additional study. It is necessary to develop effective technological methods for forming sections of double-curvature casing, the processing of which takes much time due to high rigidity. This article presents the results of finite element simulation of the SPF process on contact-type installations, and they can be used to build high-precision methods for determining the operating parameters taking into account the specific features of processing and the initial SOS (technological heredity) formed at the previous stages. The bending–rolling and SPF processes are simulated using the LSTC LS-Dyna Version R10 finite element analysis environment with model generation in the MATLAB environment. [ABSTRACT FROM AUTHOR]