Abstract
In this paper, the friction characteristics and the drilling force theory model have been studied in friction drilling austenitic stainless steel AISI 321 for solving the drilling difficult problem of thin sheet workpiece. Firstly, a equivalent test platform of friction drilling friction characteristics is established based on CA6140 lathe, and the friction characteristics of AISI 321 are studied under the different conditions of contact pressure and speed for revealing the effect of pressure and speed on the friction coefficient between tool and workpiece. Then, the empirical formula model of friction coefficient is established based on the experimental results. Finally, the improved drilling force theory model of friction drilling process is developed based on the unique geometrical shape of friction drilling tool and the equivalent friction model. Results show that the predicted force model is more accurate, which considered the actual friction coefficient model.
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