Investigation of stability parameters on surface response during turning operation of mild steel

Abstract

This thesis presents an experimental investigation with the main focus of determining the effect of cutting parameters as well as the tool construction on the surface roughness, chip size and structure, tool tip temperature and the chip morphology with variation in the tool over-hang length. Machining experiments were carried out on a conventional lathe machine using carbide cutting insert coated with TiC and two forms of cutting tools made of AISI 5140 steel. Three levels for over-hang length was selected as the cutting variable viz. 20 to 70 mm, depth of cut, feed rate and the machine rpm were kept constant. Through graphical and observational techniques, it was observed and concluded that the over-hang length had a significant effect on the surface roughness, the tool tip temperature as well as other parameters kept in check. These experiments led to the establishment of an optimum overhang length value with promising result of surface finish quality and with little tool wear and negligible internal stress caused by overheating during cutting