A novel generating machining process for screw-rotors using an internal-cylindrical skiving cutter on a new CNC skiving machine

• Published in: Mechanism and machine theory 2023-06, Vol.184, p.105278, Article 105278
• Main Authors: Luu, Trong-Thuan, Wu, Yu-Ren
• Format: Article
• Language: English
• Subjects: Cylindrical skiving cutter; Gear skiving; Internal skiving cutter; Screw rotors
• ISSN: 0094-114X; 1873-3999
• DOI: 10.1016/j.mechmachtheory.2023.105278

•An internal-cylindrical skiving cutter is proposed.•Free-error flank of screw rotors on a general skiving system is achieved.•A cutting process on a new CNC skiving machine is presented.•The influence of feed motion on the skived screw rotors is considered.•An even grinding stock on the skived screw rotors is achieved. To reduce machining time and improve accuracy for producing screw rotors, this study proposes a generating machining process using an internal-cylindrical skiving cutter on a new CNC skiving machine. An internal-barrel rotor is first generated based on a conjugation relationship with a male/female rotor. Then, the cutting edges of the internal-cylindrical skiving cutter are defined by the intersection curves between the rake plane and the barrel rotor surface. A geometrical analysis of the clearance angle allows adjustment of the relative position between the cylindrical cutter and the skived rotor on the cutter's axis. Furthermore, a general model for the skiving process is presented. The result shows that the normal deviations on the skived screw rotors are very close to zero. In addition, a new CNC skiving machine is proposed to perform the cutting process when considering the influence of feed rate. Accordingly, the surface morphology of the skived screw rotor is in the form of micro-size waves arranged in a diagonal structure. Finally, the skived screws surface with a predefined grinding stock is achieved by modifying the cutter geometric.