mahtvormimise protsess/operatsioon, mille eesmärgiks on tooriku pikkuse suurendamine ristlõikepinna vähendamise arvel (vt pikivenitus; ristivenitus; ringvenitus), bulk forming (forging) opertions performed to make metal longer by pulling and stretching in the cross-sectional area while the force is applied in perpendicular direction to the length axis (see: dra