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我厂生产的圆弧锥齿轮花键轴,如图1所示。经渗碳直接淬火、回火后,在磨削花键侧面时出现沿键高方向延伸、与键长方向平行分布的裂纹。断口观察表明,裂纹沿残留奥氏体晶界发展,如图2所示。 1.裂纹分析花键轴磨裂的因素主要有:(1)磨削应力与磨削热。尽管砂轮对零件的磨削过程是很复杂的,但基本上可视为负前角切削,键侧承受很大拉应力,导致在垂直于拉应力的方向形成裂纹。同时,砂轮与磨削表面接触,产生很大的磨削热,应及时散发或设法减少。
I plant arc bevel gear spline shaft, shown in Figure 1. Directly after carburizing quenching, tempering, when grinding the spline side along the high direction of the key to extend, with the key length direction parallel to the distribution of cracks. Fracture observations show that the crack develops along the retained austenite grain boundaries as shown in Figure 2. Crack analysis Spline shaft grinding are the main factors: (1) grinding stress and grinding heat. Although the grinding wheel is complicated to grind the parts, it can basically be considered as negative rake, and the key side is subjected to high tensile stress, resulting in the formation of cracks in a direction perpendicular to the tensile stress. At the same time, the grinding wheel and grinding surface contact, resulting in a large grinding heat, should be distributed in time or try to reduce.