Mathematical models to predict surface finish in fine turning of steel. Part I.

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Abstract
This paper outlines the experimental development of mathematical models for predicting the surface finish of AISI 4140steel in fine turning operation using TiC coated tungsten carbide throw away tools. A novel experimental design called the rotatable design was used for the experimental procedures. Variables included in the model are: cutting speed, feed, depth of cut and time of cut of the tool. Statistical coding was used for the experimental variables. First order (log transformed) models were developed. For tools that exhibited lack of fit for the first-order models, a second-order model was developed. Multiple regression analysis was used in developing these prediction models. The models developed are for the TiC coated tungsten carbide tools of following nose radii: and inch. In Part fl of this paper, surface finish predictive equations for fine turning developed for both TiC coated and uncoated throwaway cutting tools are further discussed.

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