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在钢轨气压焊加热过程中,由于存在火焰干扰,实时检测焊接温度十分困难,无法实现焊接温度和质量的自适应控制。本文利用新型数控气压焊轨机,依据钢轨加热纵向膨胀热应力与温度场之间存在的物理性质对应关系,采用ANSYS有限元软件分析方法,对顶锻力为720和1200 kN的两种数控气压焊轨机,在恒位移控制工艺条件下,对实时采集获得的保压压力参数进行统计,对其表征焊接温度场特征的信息进行分析和模拟计算,获得了钢轨气压焊接温度场模拟结果。结果表明,在钢轨气压焊恒位移控制新工艺条件下,无论设备顶锻力大小,只要监控保压压力参数,经过程序控制计算,就能够监控钢轨气压焊接温度场。经平原和高原地区现场焊轨工程应用,该种质量控制方法实用性良好,焊接质量稳定。
During the welding process of rail pressure welding, it is very difficult to detect the welding temperature in real time because of the flame interference, so that the adaptive control of welding temperature and quality can not be realized. In this paper, based on the new NC pneumatic welding machine, according to the physical properties between the longitudinal expansion thermal stress and the temperature field of the rail heating, ANSYS finite element software analysis method is used to analyze the two numerical control pressures of 720 and 1200 kN Welding machine under the condition of constant displacement control, statistics the dwell pressure parameters obtained in real-time acquisition, and analyzes and simulates the information of the characteristic of the welding temperature field, and obtains the simulation result of the temperature field of the rail pressure welding. The results show that under the new condition of constant displacement control of rail pressure welding, the temperature field of rail pressure welding can be monitored only by monitoring the pressure holding pressure parameters and calculating through the program control, regardless of the upsetting force of the equipment. The plains and plateau welding rail site applications, the kind of quality control method is practical, welding quality and stability.