CAM03 - Oblique Cutting.pdfVIP

Manufacturing Processes Material Removal (Oblique Cutting) Definition and Issues • Cutting edge is not normal to the direction of travel • Force and power analysis is not simple • Cutting parameters (speed, feed, depth of cut) found from tables or empiric formulae • In general, P = Kp CQW where Q is MRR and K , C, and W are constants p 2 1 Cutting Geometry V Plan V i Cutting α V Edge Elevation 3 Oblique Cutting Methods • Turning – Workpiece rotates and carriage moves • Milling – Tool rotates and machine bed moves – Horizontal (Slab Milling) – Vertical (End Milling) • Drilling – Tool rotates and workpiece remains stationary 4 2 Turning • Lathe is used to perform turning • The tool remains stationary and the workpiece rotates • Typical Cutting Parameters – Speeds are 0.15 to 4 m/s (30 to 800 ft/min) – Feeds are 0.2 to 2 mm/rev (8 to 80 thou/rev) – Depths of Cut are greater than 0.5 mm (0.02 in) – These are determined from tables 5 Lathe Specifications • Swing (Maximum Workpiece Diameter) • Maximum Distance between Headstock and Tail