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A robust design of a disk-type milling cutter involving multiple inserted blades is required in screw rotor milling since it significantly influences the machining precision. Hence, it is essential to discover a prediction model for rapidly simulating rotor profiles and cutting marks to evaluate the cutter design to enhance the cost-time savings in cutter manufacturing. This study proposes an insert-cutting trajectory (ICT) method that is resolved by considering the cutting-edge form of each insert type and cutting conditions. In addition, the ICT method's accuracy is determined according to the number of points on the insert cutting-edge length and the number of grids on the tooth profile length. The result confirms that the rotor profile and the surface cutting marks were successfully generated by applying both disk-type milling cutters with standard and special inserts. The profile results indicate that the special insert can achieve smoother than the round-standard insert. The ICT method relied on the screw rotor milling with distinction cutting conditions utilizing the special inserts. Finally, an experimental result verified that the ICT method is reliable and practicable. [ABSTRACT FROM AUTHOR]

• The unique inserts cutting-edge are generated considering the cutter curve curvature. • A modified cutter coordinate system is constructed with a revolve angle to arrange the insert. • Both cutters with special and round-standard inserts are compared. • A cutting simulation and experimental verification are performed. • Rotor profile and surface topography are investigated to evaluate the cutter design. A milling cutter with inserted blades is designed for each screw rotor since the geometry profile is unique, corresponding to its purposes and function. Correctness in cutter design, including the cutting-edge insert profile, is necessary to achieve a precise rotor profile; therefore, it is essential to introduce an enhanced cutter design. This study proposes a design of a disk-type milling cutter with special inserts. The insert cutting edge was generated on the axial plane considering the cutter curve curvature and then positioned onto the cutter body according to the modified coordinate system with a revolve angle. The analytical cutting result indicates that the simulated profile is relatively even along the gear tooth profile and the normal deviation is significantly tinier than the insert arrangement area. In addition, the cutter design applying special inserts acquires better results than standard inserts. Finally, the experimental result, including the rotor surface topography, confirms that the proposed cutter design is reliable and realistic in CNC screw rotor milling. [Display omitted] [ABSTRACT FROM AUTHOR]