Different ways of friction coefficient determination in stripe ironing test

Abstract

The sheet metal stripe ironing laboratory test has been developed to study tribological appearances and performance of lubricants in ironing process. Most common way for friction coefficient determination in the test is use of different formulas which gives relation between active forces and reactive friction forces. In application of such a formulas some difficulties occurs because of improper friction coefficient values, especially at small intensities of tensile or drawing forces. In this paper for literature approaches were analyzed and after that defining of new formula was proposed. New formula was tested numerically and experimentally. Obtained results indicated that the suggested improvements gives much more acceptable values of friction coefficient. That fact is particularly significant in lubricant evaluation process.