Edged Corner Shaping and Pocket Milling by Means of 6-Axis Control Machining

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The study deals with a new machining concept by making use of 6-axis control. 6-axis control implies that a cutting tool allows three rotational movements for positioning as well as three translational ones. A 6-axis control machining center is equipped with a main spindle cpable of tool orientation in addition to conventional 5-axis control sturcture. Non-rotational cutting tool is mounted at the main spindle to carry out the 6-axis control machining, which allows a variety of machining possibilities. The study deals with the development of a software system for corner shaping by use of a non-rotational cutting tool. Conrner shaping is one of typical examples of 6-axis control machining. The corner shape formed by conventional rotational tools has a round, which is impossible to remove without manual finishing. Thus, a non-rotational cutting tool was developed to remove the remaining. The tool can not only finish a sculptured surface of a corner with the side cutting edge, but also form a sharp curved line of a corner with the top cutting edge. A sharp curved line without a round is obtained by feeding the non-rotational cutting tool along the curved line, while keeping the cutting edge tangent to the sculptured surface. From an experimental result of corner shaping, it is found that the system is valid to obtain workpieces consisting of sculptured surfaces without round conrner. The method is further expanded to machine a pocket milling consisting of planes and sculptured surfaces. A non-rotational cutting tool is fed along with a cross-sectional curved line between sculptured surface and a given plane. A generated CL data are transformed to the actual 6-axis control NC data. The validity of CAM software developed in the study is also found from experimental results.