辊筒锥形钻头中表面纹理金属密封的多场耦合数值分析和实验验证

IF 3.1 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Yi Ma, Ziang Li, Ziyang Yuan, Xiangkai Meng, Xudong Peng, Jin-bo Jiang
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引用次数: 0

摘要

金属密封件在确保滚柱锥钻头轴承系统可靠运行方面起着至关重要的作用。由于井下条件错综复杂,密封端面的微观结构设计,特别是表面纹理,很少用于金属密封件。本研究的重点是探讨表面纹理技术在锥形钻头金属密封件中的适用性,以增强端面之间液膜的润滑特性和摩擦磨损性能。研究建立了表面纹理金属密封件的多场耦合模型,并进行了实验验证。研究了五种不同形状的表面纹理端面(圆形、椭圆 I(水平)、椭圆 II(垂直)、三角形和楔形)在不同转速和环境压力下的液膜承载能力和密封性能。研究了纹理参数(包括深度和面积比)对表面纹理金属密封件的润滑特性和减摩效果的影响,并分析了密封端面的微观磨损形态特征。结果表明,表面纹理能有效改善金属密封件的液膜状态和综合性能。具体来说,三角形纹理能显著增强流体动力压力效应,减弱端面的磨料磨损和粘着磨损。然而,当环境压力 p≥30 MPa 时,表面纹理会逐渐失去动态润滑的优势,但仍能减少摩擦。适当的纹理深度和面积比可以实现金属密封件的零泄漏(理论上可以实现)和最小摩擦。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi-Field Coupling Numerical Analysis and Experimental Validation of Surface-Textured Metal Seals in Roller Cone Bits
Metal seals play a crucial role in ensuring the dependable functioning of the bearing system in roller cone bits. Due to the intricate nature of downhole conditions, the microstructure design of sealing end faces, specifically the surface texture, is rarely used in metal seals. This study focuses on examining the applicability of surface texture technology in metal seals for cone bits to enhance the lubrication characteristics and friction and wear properties of liquid film between end faces. A multi-field coupling model of surface-textured metal seals was established and experimentally verified. The liquid film carrying the capacity and sealing performance of five different shapes of surface-textured end faces (circle, ellipse I (horizontal), ellipse II (vertical), triangle, and chevron) were investigated under varying rotational speeds and environmental pressures. The influences of texture parameters, including depth and area ratio, on the lubrication characteristics and friction reduction effects of surface-textured metal seals were investigated, and the microscopic wear morphology characteristics of the sealing end faces were analyzed. The results show that surface textures can effectively improve the liquid film state and comprehensive performance of metal seals. Specifically, triangle textures significantly enhance the hydrodynamic pressure effect and weaken the abrasive wear and adhesive wear of the end faces. However, when the environmental pressure is p ≥ 30 MPa, the surface textures gradually lose the advantages of dynamic lubrication but can still reduce friction. The proper texture depth and area ratio can achieve zero leakage (obtained theoretically) and minimal friction in metal seals.
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来源期刊
Lubricants
Lubricants Engineering-Mechanical Engineering
CiteScore
3.60
自引率
25.70%
发文量
293
审稿时长
11 weeks
期刊介绍: This journal is dedicated to the field of Tribology and closely related disciplines. This includes the fundamentals of the following topics: -Lubrication, comprising hydrostatics, hydrodynamics, elastohydrodynamics, mixed and boundary regimes of lubrication -Friction, comprising viscous shear, Newtonian and non-Newtonian traction, boundary friction -Wear, including adhesion, abrasion, tribo-corrosion, scuffing and scoring -Cavitation and erosion -Sub-surface stressing, fatigue spalling, pitting, micro-pitting -Contact Mechanics: elasticity, elasto-plasticity, adhesion, viscoelasticity, poroelasticity, coatings and solid lubricants, layered bonded and unbonded solids -Surface Science: topography, tribo-film formation, lubricant–surface combination, surface texturing, micro-hydrodynamics, micro-elastohydrodynamics -Rheology: Newtonian, non-Newtonian fluids, dilatants, pseudo-plastics, thixotropy, shear thinning -Physical chemistry of lubricants, boundary active species, adsorption, bonding
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