Some Topics in Process Planning of Rotational Turning

Article history: Received: 19.02.2013. Received in revised form: 29.03.2013. Accepted: 29.03.2013. There could be different procedure variants of chip removal by the applied kinematic relations in turning operations. Recently, some research and analysis of these variants have come to the front since turning can replace grinding in precision machining operations due to the development of tools with geometrically defined cutting edge(s) and tool materials, even in machining of hardened surfaces. This frequently occurs in finish machining, therefore the application of the topography meeting the functional requirements best and also the procedure leading to that has become crucially important. Some of the technological issues of one of the variants – rotational turning – is the subject of this work. Rotational turning does the cutting with a long, oblique and spatial positioned cutting edge instead of the single-point cutting tools applied in traditional turning. The slow rotation of the cutting edge on a large diameter causes a skiving-like material removal mechanism. In order to calculate the cutting parameters as well as to determine the machining times and the productivity, the rotation angles of the tool needed for the run-in, run-out and the constant phases must be known. In this paper the rotation angles based on geometrical conditions are determined and a method for their calculation is given. The structure of the applied tool and the applicable technological parameters are described and in addition, the high productivity of this procedure is shown. Finally, the method for determining the cutting parameters is described.