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为研究轨下刚度对合金钢组合辙叉安全性能的影响规律,并选取合适的刚度值,用以指导生产设计,以12号单开道岔合金钢组合辙叉为研究对象,建立辙叉整体模型及叉心模型。基于有限单元法,分析不同轨下刚度对列车动荷载作用下辙叉的受力及变形的影响规律,且对叉心燕尾部位进行疲劳检算。结果表明,随轨下刚度增加,列车对钢轨的冲击荷载逐渐增大,钢轨所受内部拉应力及竖向变形逐渐减小。经比较,刚度值选择50 kN/mm为宜,此时,叉心燕尾处应力及疲劳检算结果显示辙叉可以满足安全使用要求。综合各安全性指标选取合适的合金钢组合辙叉轨下刚度,有助于保证辙叉自身强度和行车安全性,以改善其使用性能,延长使用寿命。
In order to study the effect of rail stiffness on safety performance of composite frogs, and select appropriate stiffness values to guide the design of production, the frog composite model And the fork heart model. Based on the finite element method, the influence law of the stiffness under different rails on the force and deformation of the frog under the action of train load is analyzed, and the fatigue of the fork dovetail is calculated. The results show that with the increase of rail stiffness, the train impact load on the rail gradually increases, and the internal tensile stress and vertical deformation of the rail decreases gradually. After comparison, the stiffness value of 50 kN / mm is appropriate, at this time, the fork dovetail stress and fatigue test results show frog can meet the safety requirements. Combining the safety indexes to select the appropriate stiffness of the composite rail under the rail can help to ensure the frog’s own strength and driving safety so as to improve the serviceability and prolong the service life.