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<p>The high-temperature nickel-based alloy GH4169 is widely used in aerospace, energy, and other fields due to its excellent high-temperature strength and oxidation resistance. However, the surface quality of GH4169 components directly after manufacturing is difficult to meet the requirements of high-precision applications, and achieving high-quality machining of such components remains challenging. Therefore, in this study, a series of polishing experiments are conducted on GH4169 workpieces using a self-developed elastic polishing head to enhance their surface quality. First, the compression behavior of the self-developed polishing head and its relationship with irrecoverable deformation and elastic stress are investigated through static pressure experiments. Based on the strain characteristics of the self-developed elastic small polishing head, a pressure distribution model is established. This model is then combined with an instantaneous velocity distribution model for the polishing contact area, which is developed based on geometric and kinematic relationships. Accordingly, the tool influence function (TIF) of the polishing head is established, and its effectiveness is verified through fixed-point polishing experiments, further characterizing the material removal characteristics. Subsequently, surface polishing experiments are conducted to investigate the effects of compression amount, spindle speed, and feed speed on surface roughness and polishing force. A surface roughness prediction model is then established using the response surface method to explore the interactions among these factors and determine the optimal polishing parameters. Finally, three sets of surface polishing experiments are conducted using the optimal processing parameters. The experimental results show that the average surface roughness is reduced by 79.77%, from 0.43&#xa0;μm to 87&#xa0;nm, indicating that the elastic small polishing head can be effectively applied to the polishing of GH4169 material and can improve its surface quality.</p>

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Characterizing the tool influence function with a novel viscoelastic small polishing head for GH4169 alloy to achieve high-precision surface finish

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Chuang Zhang,
  • Jun Cheng,
  • Zhaozhi Guo,
  • Jingyu Li,
  • Kefeng Song

摘要

The high-temperature nickel-based alloy GH4169 is widely used in aerospace, energy, and other fields due to its excellent high-temperature strength and oxidation resistance. However, the surface quality of GH4169 components directly after manufacturing is difficult to meet the requirements of high-precision applications, and achieving high-quality machining of such components remains challenging. Therefore, in this study, a series of polishing experiments are conducted on GH4169 workpieces using a self-developed elastic polishing head to enhance their surface quality. First, the compression behavior of the self-developed polishing head and its relationship with irrecoverable deformation and elastic stress are investigated through static pressure experiments. Based on the strain characteristics of the self-developed elastic small polishing head, a pressure distribution model is established. This model is then combined with an instantaneous velocity distribution model for the polishing contact area, which is developed based on geometric and kinematic relationships. Accordingly, the tool influence function (TIF) of the polishing head is established, and its effectiveness is verified through fixed-point polishing experiments, further characterizing the material removal characteristics. Subsequently, surface polishing experiments are conducted to investigate the effects of compression amount, spindle speed, and feed speed on surface roughness and polishing force. A surface roughness prediction model is then established using the response surface method to explore the interactions among these factors and determine the optimal polishing parameters. Finally, three sets of surface polishing experiments are conducted using the optimal processing parameters. The experimental results show that the average surface roughness is reduced by 79.77%, from 0.43 μm to 87 nm, indicating that the elastic small polishing head can be effectively applied to the polishing of GH4169 material and can improve its surface quality.