Mospan D. Perfection of technology of forming flat sheet with a rectilinear groove by bending.

The dissertation is aimed at the increase of efficiency and decrease of expenses on technological equipment of stamping flat sheet items with a rectilinear groove with expansion of technological opportunities of edging machines. The paper describes the technological processes of forming a rectilinear groove with a step punch and from the previously bent blank with subsequent straightening of flat elements of the blank. With the purpose of theoretical researches of force loading of the metal of the blank at straightening previously bent flat elements of an item under treatment on the basis of the methods of small elastic - plastic deformations, variable parameters of elasticity and Galerkin a numerical model is developed. The application of the given software has allowed to determine conditions of force loading and geometry of a previously bent sheet blank, at which the process of forming a final profile of the stamped item is carried out. On the basis of the offered process a practice of forming flat sheet items with rectilinear grooves is developed, at which preliminary bending of a sheet blank and straightening of flat elements of the blank without application of a bending punch appropriate to the form of the rectilinear groove is carried out. The numerical - analytical modeling of the offered technological scheme of force loading is executed, that has allowed to establish features of performance of the offered process at various geometrical parameters of a previously bent blank. A complex of experimental researches is carried out, which has confirmed the possibility of manufacturing flat sleet blanks with a rectilineat groove according to the specifications. The results of the experimental data on gauging bending forces, deflection, deformations of the blank confirm the reliability of the received theoretical dependences.