Erdenet Institute of Technology, Mongolian University of Science and Technology (Erdenet City, Mongolia)

B. Purevdorj, purevdorj@erdenetis.edu.mn
D. Battsengel*, battsengel@erdenetis.edu.mn

* Corresponding author

The tool life of tungsten carbide-cobalt solid and multi-coated (Al2O3+Ti(CN)) ceramic hard alloy tools was evaluated by time duration in turning of 28 % high chromium white cast iron castings. Experimental study was performed using the Full Factorial Design of Experiments (FFDoE) method using Minitab statistical software, and a regression model was developed based on process factors: cutting speed V, feed rate f and cutting depth t. The influencing range of the factors was selected at upper and lower two levels. Both of semi-quadratic and linear regression models were developed by using the experimental results. In the first, a semi-quadratic regression equation was generated including each factor and each joint effect. Then, after statistical evaluation re-processing was performed by removing the non significant terms of effects. The experimental results showed that the tool life of multi-ceramic coated hard alloy tool was higher than the solid tungsten carbide by 25 and 16 %n light and heavy turning regime, respectively. The semi-quadratic equation includes eight possible effects of factors, but is only 0.6–0.8 % more accurate than the linear model that includes four effects. Therefore, the linear regression model is sufficient to predict the high-chromium white cast iron machining process with using of carbide-cobalt solid and ceramic coated hard alloy tools. The values expressed by the linear regression model are correlated with the experimental one more than 0.98 %.

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