载重60吨的货车上心盘产生裂纹的问题已成为全路所关注的问题。造成上心盘裂纹的因素很多,其中最主要的是中梁与心盘座组装后出现间隙。因此提高心盘座组装质量就成为新造厂的一个突出问题。造成中梁心盘座处不平的主要原因是车辆用乙型钢下翼板与腹板存在公差90°±45′(图1)。根据实际测量,轧制的乙型钢下 The problem of crazing on the center of a truck weighing 60 tons has become a concern of the whole road. Caused by many factors on the heart plate crack, one of the most important is the beam and the center of the seat assembly after the assembly gap. Therefore, to improve the quality of the assembly of the center of the beard has become a prominent problem of the new factory. The main reason for the uneven seating of the center core plate seat is that there is a tolerance of 90 ° ± 45 ’(Figure 1) on the lower wing of the vehicle’s steel B-arm and the web. According to the actual measurement, the rolling of the B steel