Modelling the Cut Layer When Thread Milling

Using geometric modelling of the thread milling process in Autodesk Inventor 2014 (student version), the shape of the cut layer when machining with a single-disk tool is obtained. An algorithm is developed for geometrical modelling of the shape for the cut layer when milling internal threads using the kinematic scheme with parallel axes of the thread and the tool. An analysis of the obtained cut layer shape is performed. It is shown that the shape is characterized by four distinctive cross sections at different areas along the engagement angle. The influence of the thread and the tool design parameters and the feed per tooth on the engagement angle between the cutter and the workpiece, and on the maximum value of the cross-sectional area of the cut layer is established. The relationship between the cross-sectional area of the cut layer and the above-mentioned parameters is deduced. The results of the analysis can be used for estimating the force occurring when thread milling.

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