Surface Damage Behaviors of the Radial Bearings for Deep Drilling Tools under the Synergistic Effect of Temperature and Load

doi:10.3969/j.issn.1004-132X.2026.07.005

Abstract

Abstract:

The stress and strain distributions of radial bearings for deep drilling tools under the synergistic effects of temperature and load are studied via finite element simulations using ANSYS Workbench. The simulation results show that the maximum equivalent stress and strain occur near the cemented carbide-solder interface （i.e.， the welding interface） and the cemented carbide-cemented carbide interface （i.e.， the sliding interface）. Temperature significantly increases the stress and strain levels； the maximum equivalent stress and strain at 300 ℃ are approximately 2.5 times higher than those at 100 ℃. The frictional stress at both ends of the bearings is higher than that in the middle region， making the end regions more susceptible to adhesive wear. The simulation results are in good agreement with the damage distribution characteristics observed after field application， indicating that these findings can provide a theoretical reference for the optimal design of radial bearings.

Key words: radial bearings, surface damage, temperature, load, finite element analysis

摘要：

采用ANSYS仿真分析了深地钻具径向轴承在温度、载荷协同作用下的应力/应变分布状态。仿真结果表明，最大等效应力/应变出现在硬质合金/焊料界面（焊接界面）和硬质合金/硬质合金界面（摩擦界面）附近；温度显著提升应力/应变水平，300 ℃下的最大等效应力/应变较100 ℃下的最大等效应力/应变增大约2.5倍；轴承两端的摩擦应力高于中间区域，且更易发生黏着磨损。上述仿真结果与实地服役轴承的损伤分布特征高度吻合，可为径向轴承的优化设计提供理论参考。

关键词: 径向轴承, 表面损伤, 温度, 载荷, 有限元分析

CLC Number:

TP182

LOU Ming, YANG Xunwang, HAO Kaiyuan, XU Kai, YU Xingsheng, SHEN Haichun, ZHANG Guotian, CHANG Keke. Surface Damage Behaviors of the Radial Bearings for Deep Drilling Tools under the Synergistic Effect of Temperature and Load[J]. China Mechanical Engineering, 2026, 37(7): 1572-1579.

娄明, 杨训旺, 郝开元, 徐凯, 于兴胜, 沈海春, 张国田, 常可可. 温度与载荷协同作用下深地钻具径向轴承的表面损伤行为[J]. 中国机械工程, 2026, 37(7): 1572-1579.

Figures/Tables 13

Fig.1 Typical structures of the drive shaft assembly and the radial bearing set of drilling tools

Fig.2 Schematic diagram of sliding contact surfaces between the moving rings and stationary rings of radial bearings

Fig.3 Simulation model of the moving rings and stationary rings of radial bearings

Tab.1 Validation of mesh independence

序号	硬质材料和焊料区域的网格尺寸/mm	基体区域的网格尺寸/mm	网格数量	最大等效应力/MPa
1	1.0	10.0	537 233	382
2	1.5	10.0	339 793	380
3	2.0	10.0	294 712	383
4	2.0	8.0	337 581	385
5	2.5	10.0	258 271	387
6	3.0	10.0	248 091	391

Tab.2 Definition of materials properties［10-16］

材料	密度 ρ/（kg∙m^-3）	热膨胀系数 α/K^-1	热导率 K/（W∙m^-1∙K^-1）	比热容 C/（J∙kg^-1∙K^-1）	弹性模量 E/GPa	泊松比ν	硬度HV	屈服强度 MPa
YG8合金片	14600	5.8×10^-6	134	200	577	0.23	1270	-
Ti（C，N）片	6400	9.4×10^-6	17	466	484	0.19	1300	-
AgCuZn焊料	9500	1.9×10^-5	150	300	80	0.34	130	400
CuNiZn焊料	8400	1.6×10^-5	40	380	120	0.33	200	557
42CrMo基体	7850	1.2×10^-5	40	460	210	0.28	260	550

Fig.4 Simulation results of the radial bearings at a temperature of 100 ℃ and dynamic bearing loads of 0~10 kN

Fig.5 Simulation results of the sliding interfaces for bearing （100 ℃， dynamic loads of 0~10 kN）

Fig.6 Simulation results of the radial bearings at a temperature of 100 ℃ and dynamic bearing loads of 0~10 kN

Fig.7 Simulation results of the sliding interfaces at a temperature of 100 ℃ and dynamic bearing loads of 0~10 kN

Fig.8 Morphological analyses on the damaged surfaces and interfaces of the moving ring and stationary ring of radial bearings dismantled from deep drilling tools

Fig.9 Simulation results at different temperatures and dynamic bearing loads of 0~10 kN

Fig.10 Simulation results of the sliding interfaces at a temperature of 300 ℃ and dynamic bearing loads of 0~10 kN

Fig.11 Simulation results of different materials combinations at a temperature of 100 ℃ and dynamic bearing loads of 0~10 kN

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