Abstract One of the urgent problems that has yet to be addressed in the field of drilling engineering is how to further improve the working performance of rock bit journal bearings (RBJBs) and prolong their service life under complicated conditions of low speed, heavy load, and high temperature. Generally, reasonable surface texture parameters serve as an effective means for enhancing the lubrication and antiwear performance of the sliding surface under harsh lubrication conditions. This study combines the geometric similarity with Sommerfeld similarity and designs an RBJBs scaling experiment; then, experimental studies are performed using an improved journal bearing test bench. The effects of nanosecond laser-textured shape, geometric parameters, and angle factors on the tribological properties of RBJBs are discussed. The results indicate that cylindrical, elliptical, and chevron textures with appropriate parameters can significantly reduce the wear and improve the lubrication performance of RBJBs under the simulated test conditions.

中文翻译：

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纳秒激光表面纹理轴颈岩石钻头轴颈轴承的摩擦学特性

摘要 如何进一步提高钻头滑动轴承（RBJBs）在低速、重载、重载等复杂条件下的工作性能，延长其使用寿命，是钻井工程领域亟待解决的问题之一。高温。通常，合理的表面织构参数是在恶劣的润滑条件下提高滑动面润滑和抗磨性能的有效手段。本研究将几何相似性与Sommerfeld相似性相结合，设计了RBJBs标度实验；然后，使用改进的轴颈轴承试验台进行实验研究。讨论了纳秒激光纹理形状、几何参数和角度因素对 RBJB 摩擦学性能的影响。