Abstract: Based on the analysis of the influence of hard-to-deform region on the distribution of stress and strain on forgings in current upsetting and drawing, a new drawing technology named concave anvil drawing is put forwards. By means of numerical simulation and physical simulation, different effects of conventional flat anvil and concave anvil, conventional V-shape anvil and concave V-shape anvil on the equivalent deformation, status of hydrostatic pressure and voids crushing in forgings during drawing are compared. It shows that as far as statuses of stress are concerned, on the condition that the deformations are same, concave flat anvil forging(CFAF) increases hydrostatic pressure by 30% , concave V-shape anvil forging(CVAF), 50%; as far as deformations are concerned, on the condition that the hydrostatic pressures are same, CFAF decreases reduction by 33.5%, CVAF, 26.5%; as far as void is concerned, by employing concave anvil the ovality of the void is 10% smaller than that by employing conventional anvil. Compared with other special methods, concave anvil drawing methods are more convenient to use and don’t need complicated auxiliary tools.

Key words: Drawing, Forge, Large forgings