<p>A finger-like cutter is an appropriate manufacturing tool for milling the claw rotor profile because the cycloid curve of the profile makes it difficult to use a disk cutter. Additionally, the actual rotor profile deviates from the design profile during manufacturing due to factors such as vibration, temperature fluctuations, and assembly misalignment between the cutter and the workpiece. Therefore, an optimization method is proposed to reduce the profile error of screw rotors milled with a finger-like cutter in a multi-axis CNC machine. The mathematical model for designing the finger-like cutter profile is established based on the relationship between the cutter’s motion and the screw rotor. A general coordinate system for simulating the milling process of the screw rotor in a CNC machine is constructed incorporating compensated parameters. An optimization model is then developed to determine the optimal compensated parameters that minimize the profile errors of the milled rotor. In the numerical example, the maximum profile errors decrease by 65.22% when applying three compensated parameters and by 73.22% when applying three additional compensated parameters. Moreover, the influence of the weighted factor on the profile error is analyzed.</p>

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Optimization Method of Cutter Position for Enhancing the Machining Accuracy of Rotor Manufactured by Finger-like Cutter

  • Minh-Thuan Hoang,
  • Minh-Tuan Nguyen

摘要

A finger-like cutter is an appropriate manufacturing tool for milling the claw rotor profile because the cycloid curve of the profile makes it difficult to use a disk cutter. Additionally, the actual rotor profile deviates from the design profile during manufacturing due to factors such as vibration, temperature fluctuations, and assembly misalignment between the cutter and the workpiece. Therefore, an optimization method is proposed to reduce the profile error of screw rotors milled with a finger-like cutter in a multi-axis CNC machine. The mathematical model for designing the finger-like cutter profile is established based on the relationship between the cutter’s motion and the screw rotor. A general coordinate system for simulating the milling process of the screw rotor in a CNC machine is constructed incorporating compensated parameters. An optimization model is then developed to determine the optimal compensated parameters that minimize the profile errors of the milled rotor. In the numerical example, the maximum profile errors decrease by 65.22% when applying three compensated parameters and by 73.22% when applying three additional compensated parameters. Moreover, the influence of the weighted factor on the profile error is analyzed.