Effect of Interrupted Cutting of Variable Loading on Cutting Tool

Abstract

Cutting tools are used in various processes at very different conditions including material behaviors, machining parameters, geometry, and tribological characteristics. For an efficient machining, a cutting tool requires high hardness, high chemical stability, and high wear resistance. Machining can be more challenging in the interrupted cutting due to the alteration in mechanical and thermal loads. When interrupted surfaces are machined, the tool also requires sufficient impact and fatigue resistances. The main goal of this work to investigate the effect of interrupted cutting of variable loading when turning AISI 4140. Based on the experimental results, the main conclusion of this work was the tool life was shorter in the interrupted turning experiments. Although lower tangential cutting forces were measured in the interrupted cutting tests, the intervals deteriorated the tool life. The trends of the tangential cutting forces were observed as expected in the continuous turning at dynamic loading whereas the trends were different and not as expected in the interrupted turning. In both continuous and interrupted turning at dynamic loading, abrasive wear was the major mechanism on the flank surface.