Modeling of the process of residual stress generation during pneumatic blast hardening

The hardening of the details of take-off and landing devices made of titanium alloys is fraught with great difficulties, especially with regard to changing the accuracy of the shape and location of surfaces in the process of pneumatic blast hardening. The solution to this problem of technological assurance of accuracy and surface quality is associated with controlling the degree and depth of propagation of residual stresses after the remote control. The article solves the problem of modeling the process of pneumatic shotblasting of titanium alloy VT22 in the ANSYS and RockyDEM software package. Three problem statements were considered: the interaction of a single fraction; the interaction of the fraction flow with the processed surface in 2D execution; the interaction of the fraction flow with the processed surface in 3D execution. The dynamic behavior of the fraction flow is considered, which made it possible to determine the size of the contact spot, the presence of stagnant zones, and the maximum number of impacts of the fraction into a single dent to achieve maximum plastic deformation. It has been found that increasing the fraction velocity from 60 m/s to 90 m/s reduces the number of strokes from 12-15 times to 6-8.Calculations show that the remote control process with the modes obtained by modeling increased the fatigue strength of the part by 28%.