Investigation on tool wear mechanism during dry cutting 304 stainless steel

Abstract

With the determined parameters of cutting speed, feed rate and back cutting depth, cemented carbide tool was adopted to dry cut 304 stainless steel, exploring the tool wear failure mechanism and its effect on the surface quality of the workpiece under different cutting times. The morphology of the tool surface is observed by scanning electron microscopy, and the component of the tool is analyzed by energy dispersive spectroscopy. The three-dimensional microscopic shape of workpiece surface is observed by a three-dimensional shape analyzer and the surface roughness Ra was measured. The results indicate that during the process of 6-minute cutting, the abrasive wear and adhesion wear are occurred on the tool, the surface quality of the machined workpiece is good; during the process of 12-minute cutting, oxidation wear is appeared while the tool subjects abrasive wear and adhesion wear, and the surface quality of the machined workpiece become pool; during the process of 18-minute cutting, the tool is under the combined action of various wear mechanism. Because of the passivation of tool nose, the surface quality of the workpiece is deteriorated, and it can't meet the requirements of finish machining. In the process of dry cutting workpieces by cemented carbide tool, the tool suffers abrasive wear, adhesion wear and oxidation wear. The surface quality of the workpiece is declined due to the passivation of the tool nose.