Optimization of cone bit bearing seal based on failure analysis

Abstract

To improve the performance of the cone bit bearing seal, experimental study and simulation analysis of seal failure were carried out, and optimization of the seal was conducted. Results show that damages are located on the shoulder of the rubber rings due to high shear stress caused by large compression ratio, and serious wear appears on the sealing face of the metal rings because of unreasonable contact pressure distribution. Optimization was conducted by finite element method on three aspects: the dip angles (3°-8°) of the sealing face, the widths (1.3-3.9 mm) of the sealing face, and the back support structure (10°-15°). These three aspects were optimized one by one. Each aspect was optimized by different values, with the average compression ratio and the contact pressure distribution of the sealing face acting as evaluations. The optimal value of the previous optimization step performs as the static value in the next step, and finally, the optimized structure was selected from the last step. The performance of the optimized seal is significantly improved. The compression ratio of the optimized seal rubber drops to less than 14%. The wear mount of the new structure reduces to 20%-38% of the original structure.

Research on optimal design of 6in offshore flange connector’s sealing structure

“…Yang [11] et al established a numerical analysis model of O-ring seal with skeleton, obtained the optimal combination parameters to ensure sealing performance, and conformed the rationality of the sealing structure through experiments. Huang [12] et al improved the performance of the seal significantly by using the finite element method to optimize the dip angles, width, and rear support structure of the metal ring sealing surface. Cheng [13] et al used the control variable approach to study the impact of various structural parameters on the self-tightening metal U-shaped sealing ring's sealing performance and came up with the ideal structural size for the sealing ring to retain optimum sealing performance.…”

Theoretical Analysis and Numerical Simulation of the Wear of the Sealing Substrate of a High-Pressure, High-Frequency Opening and Closing Hydrogen Ball Valve

“…Mccoll et al , used a finite element-based modified Archard wear equation to simulate micro-motion wear of aero-engine alloy steel and verified the predicted wear damage based on wear test data. Huang and Li investigated the wear of a dynamic seal of a drill under severe conditions such as vibration, deflection, and high fluid–solid phase content and used the finite element method for the seal face. Yang et al studied the effect of journal misalignment on transient wear and hybrid lubrication performance using a numerical model to calculate the wear depth, wear rate, and evolution of contact pressure of bearings under different external loads.…”

Research on pipeline connection structure of microwave load water-cooling system for spacecraft thermal test

“…A certain degree of research has been conducted on the conical seal structure at home and abroad. The commonly used method is to simulate the mechanical parameters of the seal structure through the finite element method [6][7][8] , or to conduct micro-contact analysis on the seal interface through the discrete analysis method [9,10] , and in engineering application, parameter design and installation are mainly based on experience, and there is a lack of effective analysis methods to guide. Therefore, the purpose of this article is to select a conical sealing form that meets the requirements of sealing performance through theoretical research and calculate the corresponding installation parameters, to provide the theoretical basis and guidance for the application of conical sealing structure in Microwave load water-cooled pipelines.…”