Wear Characteristics of Manganese Phosphate Coated HSS Turning Tool on Machining En 24 Steel

In metal-cutting quality of machined surface is normally affected by the contact condition at the tool and work piece interface. Tool wear affects the dimensions and surface quality of the work pieces. It is also one of the important criteria in determining tool life. This paper presents the performance of 12-15 microns thickness of manganese phosphate coated tools on continuous turning of En 24 steel work piece. Manganese phosphate coating is created by chemical conversion and the main component of the film is Hureaulite (MnFe)₅ H₂(Po₄)₂. Manganese phosphate coating is observed to have the best wear resistance, intrinsic lubricant properties and very low coefficient of friction. The machining tests are conducted using coated and uncoated High Speed steel (HSS) cutting tools on En 24 steel work piece at different cutting conditions. The tool wear is measured by using the tool-maker's microscope and Images of the Wear pattern is Compared by Scanning Electron Microscope (SEM). The surface roughness is measured by surf test at each cutting speed. An attempt is made to compare the tool flank wear and crater wear of coated and uncoated cutting tools under wet and dry condition. The Characteristics of coated cutting tool is found to be superior in all aspects than uncoated tools.