Basic Investigation on Mechanism of Groove Wear Formation

Abstract

Groove wear is formed on both sides of tool-chip contact area when stainless steel (SUS 304) is turned by cubic boron nitride cutting tool in relatively low cutting speed and feed, and differs from crater wear in shape. The purposes of this paper are to clarify the relation between groove wear and physical properties of tool, work material and ambient gases experimentally and to investigate the mechanism of groove wear formation based on the experimental results. The main findings are as follows. (1) Chip is deformed extremely in convex shape on tool rake face at low feed rate, and this makes both sides of chip easier to contact to rake face than that of central part. (2) Groove wear formation is affected by the adhesion between tool and work material. The formation is accelerated by applying argon gas to the cutting point, and controlled by oxygen gas. This tendency is stressed as the increase of Ni content in work material. (3) Considerable amount of tool material is removed from both sides of tool-chip contact area in a short period. This phnomenon is confirmed through the analysis of SEM and EPMA