Modeling the process of boring pipes with the external thickening pressings

Computer modeling of pipes extension by hot pressing by final elements methods in the program DEFORM 2D complex is carried out. The schedule of change the effort of extension depending on process time is received. Authors have shown dynamics of change of geometry of a deformable pipe of rather conical site of the pro-thinned-out needle. Extension of meridional and tangential normal tension on the volume of the center of plastic deformation is described. On the basis of complete factorial numerical experiment joint influence of a corner of a cone of burt, rounding off radius in a zone of interface of conic and cylindrical sites of the pro-thinned-out needle is established, to preparation geometry on effort of distribution, an increment of size of internal diameter of a pipe owing to extra deformation, reduction of a wall of a pipe, size of the maximum meridional tension and a deviation of an internal surface of a pipe from the place of interface of a neck and a cone of a needle.