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QY8汽车起重机回转支承系采用50Mn钢,毛坯调质,滚道表面中频淬火,低温回火和磨削制成。经5000次回转试验拆检,发现上、下外圈滚道表面产生裂纹和局部疲劳剥层,见图1。回转支承是汽车起重机的关键部件(图2),其滚道表面应有足够的淬硬层,以承受外加载荷不致产生裂纹、压陷、剥层等缺陷,并要求具有较高的硬度、良好的耐疲劳性能等。
QY8 automotive crane slewing ring with 50Mn steel, rough quenched and tempered, medium-frequency surface quenching raceway, low temperature tempering and grinding made. After 5000 times rotation test dismantling, it was found that the upper and lower outer ring raceway surface cracks and local fatigue peeling, shown in Figure 1. Swing support is a key component of truck crane (Figure 2), the raceway surface should have enough hardened layer to withstand the external load will not cause cracks, sagging, stripping and other defects, and requires a higher hardness, good Fatigue resistance and so on.