ZJ70型钻机液压刹车盘的热-机耦合仿真

Thermal-mechanical coupling simulation on hydraulic braking discs of ZJ70 drill rig

为了研究ZJ70型钻机液压刹车盘温度场对应力场的影响,建立了刹车盘在制动过程中的热-机耦合仿真模型。通过对不同温度场下刹车盘进行数值仿真,得到了温度和应力分布;以固定参考点的方式分析了温度、应力及接触压力受温度场的影响情况、随时间的变化情况及云图分布规律。研究结果表明:刹车盘摩擦表面径向温度场梯度比周向温度场梯度大,且整个摩擦面的中部温度值最高;刹车盘摩擦表面轴向应力很小,周向应力大于径向应力,且在摩擦表面以压应力为主;摩擦表面最大接触压力分布在径向的中部,与温度场的变化规律相同。仿真结果为刹车盘优化设计提供了依据和参考。

In order to study the influence of temperature field of the hydraulic braking discs of ZJ70 drill rig on stress field, the simulation model of thermal-mechanical coupling during operation of the braking discs was established. After numerical simulation on the braking discs at various temperature field, the temperature and stress distribution were obtained. The fixed reference point manner was applied to analyze the influence of the temperature field on temperature, stress and contact pressure, their variation with time and their distribution laws. Research results showed： the gradient of radial temperature field was larger than that of circumferential temperature field on the friction surface of the braking discs, and the middle zone of the friction surface had the highest temperature; the axial stress on the friction surface of the braking discs was slight, the circumferential stress was greater than the radial stress, and the compressive stress dominated on the friction surface; the maximum contact pressure on the friction surface was located on the radial center, and varied as the same as temperature. The simulation analysis results offered references for optimization design of the braking discs.