A proposed mathematical model is presented for predicting the residual stresses cause by turning. Effects of change in tool free length, cutting speed, feed rate, and the tensil strength of workpiece material on the maximum residual stress are investigated. Th residual stress distribution in the surface region due to turning under unlubricate condition is determined using a deflection-etching technique. To reduce the number c experiments required and build the mathematical model for these variables, Respons Surface Methodology (RSM) is used. In addition, variance analysis and an experiment check are conducted to determine the prominent parameters and the adequacy of th model.
The results show that the tensile stress of the workpiece material, cutting speed, an feed rate have significant effects on the maximum residual stresses. The propose model, that offering good correlation between the experirnental and predicted results, i useful in selecting suitable cutting parameters for the machining of different materials.