INFLUENCE OF STRAIN PATH AND TRIBO CONDITIONS ON LIMITING RELATIONSHIPS IN DEEP DRAWING

Abstract

In the paper is considered the influence of the tribo conditions and the strain path on realization of limiting relations in typical stress - strain scheme of deep drawing - stretching. Investigation was performed on four materials aimed for deep drawing, out of which the two types of thin sheets have the anti - corrosion coating of zinc. Standard stretchings were realized, and as an example of non proportional strain were realized two phased trajectories with usage of different lubricants. We conclude that realized two phased forming - in the first phase uniaxial tension, in the second stretching - enables realization of greater degree of limiting strain, than in the conditions of proportional forming process. However, realized values of the greatest depths of drawing, as the key indicators of integral strain analyzis, are significantly lower.