200 km/h及以下道岔模锻翼轨断裂原因分析与对策  

Causes Analysis and Countermeasures of Fracture of Forging Wing Rail for Turnouts with Speed Below 200 km/h

作　　者：严安宁 YAN Anning(China Railway Baoji Bridge Group Co.Ltd.,Baoji Shaanxi 721006,China)

机构地区：[1]中铁宝桥集团有限公司,陕西宝鸡721006

出　　处：《铁道建筑》2024年第10期26-31,共6页Railway Engineering

基　　金：江西省重点研发计划(20223BBE51009)。

摘　　要：200 km/h及以下可动心轨道岔的翼轨采用模锻方式,随着应用时间的延长,线路出现多起模锻翼轨断裂事件。为了探讨模锻翼轨断裂原因,本文通过金相组织检验和有限元理论计算,从结构设计、制造工艺、运营维护、气候等方面进行了分析。初步判断,产生断裂的主要原因是翼轨锻造加热工艺落后、长期承受复杂荷载及运营状态不良;次要原因是结构设计缺陷、轨底角倒钝不合理和气温大幅度变化。为消除线路在用模锻翼轨的断裂隐患,提出了改造替换方案及日常养护维修措施。The wing rails of movable point rail turnouts with a speed below 200 km/h are forged by forging method.With the extension of application time,there have been multiple incidents of forging wing rail fracture on the railway.In order to explore the reasons for the fracture of forging wing rails,this article analyzed the structural design,manufacturing process,operation and maintenance,and climate from the aspects of metallographic structure inspection and finite element theory calculation.Preliminary judgment shows that the main reason for the fracture is the outdated forging and heating process of the wing rail,long-term exposure to complex loads,and poor operating conditions.The secondary reasons are structural design defects,unreasonable blunting of the rail bottom angle,and significant temperature changes.To eliminate the risk of fracture of forging wing rails in use,a renovation and replacement plan as well as daily maintenance and repair measures have been proposed.

关 键 词：客货共线铁路 道岔 理论分析 有限元分析 模锻翼轨 可动心轨辙叉 

分 类 号：U213.62[交通运输工程—道路与铁道工程]