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太原钢铁公司四轧厂φ350/φ1150×1200四辊冷轧机万向接手的扁头,是冷轧设备的关键零件,自投产十三年来,由于扁头经常承受方向和大小频繁变化的冲击载荷,最近在生产中头部发生断裂,其断裂位置如图1所示。经检查断口组织细密,无任何缺陷,断口面积为167cm~2,旧痕迹约占2/3,这证明是日积月累的疲劳裂纹引起的。扁头的材质为45CrV钢,重308kg,由于形状较复杂,每根轴传递扭矩的额定值为7.5t·m,原设计采用大过盈量的红套联接(无
Taiyuan Iron and Steel Company four rolling mill φ350 / φ1150 × 1200 four-roll cold mill universal take over the flat head is a key component of cold-rolled equipment, since the production of thirteen years, the flat head often bear the direction and size of the impact of frequent changes in load , The recent head in the production of fracture, the fracture location shown in Figure 1. After checking the fracture organization fine, without any defects, fracture area of 167cm ~ 2, the old marks about 2/3, which proves to be caused by fatigue cracks over time. Flat head made of 45CrV steel, weight 308kg, due to the more complex shape, each shaft torque rating of 7.5t · m, the original design of a large amount of interference with the red sets of joints (no