煤矿井下奋引7t电机车轮缘最大过盈为0.9mm，材质为ZG310-570装配时用2t油压机也很难压入。后改用热装工艺则轻松地完成了这道工序具体工艺为（1）首先将轮芯竖起置放平稳；（2）将轮缘装入箱式电炉加热，升温到500℃并保温35min；（3）出炉后测量轮缘内孔（胀大1.3mm后，应为5 Coal mine excited lead 7t locomotive maximum margin of 0.9mm wheel rim, the material for the assembly of ZG310-570 with 2t hydraulic press is also difficult to press into. After the switch to the hot-process is easy to complete this process specific process (1) First, the wheel core is erected stable; (2) The rim into the box-type electric heating, heating to 500 ℃ and holding 35min ; (3) after the measurement of the rim of the rim after the test (after expanding 1.3mm, it should be 5)