Scholarlink

<p>The P208 gun drill serves as the investigation object to address the problem of threads on the inner wall of the workpiece and uneven cutting sections during drilling. A new method is proposed for regulating the thermodynamic performance of the gun drill, alongside enhancing machining precision by modifying bearing load through temperature adjustments to diminish spindle vibration. A theoretical model for calculating the stiffness of angular contact ball bearings is developed based on Hertz contact theory, Jones bearing theory, and elastic fluid lubrication theory. The relationship between the thermodynamic performance of the bearing-spindle system, speed, and temperature has been verified through numerical simulation and experimental. The results indicate that the discrepancy between the numerical simulation and experimental values was 2.4%. Additionally, the axial and radial displacements of the bearing's inner ring exhibited a nonlinear relationship with rotational speed, with variations of 3.2&#xa0;µm and 10.1&#xa0;µm, respectively, as the rotational speed increased from 5000 to 10,000 r/min. The maxim deformation of the spindle end measures 62.7&#xa0;µm, which diminishes with rising temperature under a specific rotate speed, and the discrepancy is 6.8% with the experimental value. The aforementioned conclusions validate the efficacy of the method proposed, which offer a theoretical basis for enhancing the machining performance of the gun drill.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation on thermodynamic efficiency of the spindle bearing-rotor system under intricate operational conditions

  • 期刊论文

  • 发表日期：

    2025年9月2日

查看全文
  • Haihui Tan,
  • Tao Xu,
  • Shoujin Lin,
  • Mingdong Chen,
  • Baofu Wang

摘要

The P208 gun drill serves as the investigation object to address the problem of threads on the inner wall of the workpiece and uneven cutting sections during drilling. A new method is proposed for regulating the thermodynamic performance of the gun drill, alongside enhancing machining precision by modifying bearing load through temperature adjustments to diminish spindle vibration. A theoretical model for calculating the stiffness of angular contact ball bearings is developed based on Hertz contact theory, Jones bearing theory, and elastic fluid lubrication theory. The relationship between the thermodynamic performance of the bearing-spindle system, speed, and temperature has been verified through numerical simulation and experimental. The results indicate that the discrepancy between the numerical simulation and experimental values was 2.4%. Additionally, the axial and radial displacements of the bearing's inner ring exhibited a nonlinear relationship with rotational speed, with variations of 3.2 µm and 10.1 µm, respectively, as the rotational speed increased from 5000 to 10,000 r/min. The maxim deformation of the spindle end measures 62.7 µm, which diminishes with rising temperature under a specific rotate speed, and the discrepancy is 6.8% with the experimental value. The aforementioned conclusions validate the efficacy of the method proposed, which offer a theoretical basis for enhancing the machining performance of the gun drill.