Abstract
Technological scheme and ratios for calculating of the extrusion modes of thickenings and flanges on pipe workpieces are proposed. The viscous-plasticity state of the deformable material is accepted. The kinematics and power mode of the process are established using the extreme upper-boundary plasticity theorem with the involvement of the discontinuous fi eld of displacement velocities. Estimate of the continuity loss of the workpiece material is given. The diagram of the die tooling and sample of product are presented.
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