Coining Test for Evaluation of Tool Performance

摘要

The performance of M2 tool steel without any special coating on a set of cold formable steels is evaluated in this work using the coining technique. Cylindrical specimens were prepared from spheroidize annealed SAE 1012, 1020, 5120 and 1050 steels (representatively covering the whole gamut of cold workable steels) with an aspect ratio of d_o/h_o =1.5 (Where d_o being the original diameter and h_o being the original height). These annealed materials were measured for their initial roughness as well flatness values. They are compressed to true strains of 0.1, 0.2, 0.3 and 0.4 under unlubricated and phosphated conditions of the chosen work materials. For each of the specimen tested, the results of this study are presented and discussed. The surface roughness, crown height and barreled volume were evaluated. The study shows that the lubricated work pieces were found to have lower crown heights, smaller barreled volumes, lesser surface roughness compared to unlubricated samples.