Large Thread Whirlwind Milling Main Transmission With Rotary Milling System Modeling And Optimization

For the large-size thread whirling machining, having the characteristics of super-long transmission distance, multi-tool cutting, and multi-points constraint, makes its transmission axial stiffness, cutting force status, and the dynamic response of workpiece and whilling head system distinctly different with other common cutting.According to the novel, efficient and green of thread whirling and keeping to the particularity of large-size thread whirling and its equipment, Main transmission system axial stiffness of the machine, the hard cutting process of thread whirling, workpiece system and whirling head dynamic response are studied repectively. Based on this study, several related models are created, such as axial stiffness model of two type transmission system, FEM model of thread hard whirlling and dynamic model of thread workpiece and whirling head system. Through applying above models, weak spot of transmission system, the cutting force of whirling, dynamic responses of thread workpiece and vibration suppression of the whirling head are discussed.Axial stiffness of two different transmission forms is analyzed and compared, besides, the conception "contribution ration" is introduced to assess the overall stiffness change influenced by each unit in transmission system, both of which will provide a powerful guidance when designing thread whirling machine; By analyzing the dynamic performance of thread workpiece system and whirling head system, especially creatively employing Silicone oil shock absorber to suppress vibration of whirling head, a theoretical ground is set up. Based on this theoretical ground, the design and vibration abatement of large Thread Whirlwind thread milling machine can be carried out correctly.