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某厂B8A、TQ2高压泵总成1500小时台架试验中,分别在1443小时和183小时发生两起凸轮轴断裂故障,两次断裂的部位和形态基本一致,凸轮轴用钢为18Cr2Ni4WA。本文仅以183小时断裂件为分析对象。一检查 1 现行工艺情况凸轮轴用钢为18Cr2Ni4WA,系由棒料切制而成,工艺流线如下: 机加工→整体渗碳(910±10℃,层深1.63～1.96mm)→高温回火(650±10℃,≥5小时)→校直→去应力退火(220±20℃,≥2小时)→机加工锥部→
A factory B8A, TQ2 high-pressure pump assembly 1500 hours bench test, respectively, in 1443 hours and 183 hours occurred two camshaft rupture failure, the two parts of the fracture and the shape is basically the same, the camshaft steel 18Cr2Ni4WA. This article only 183 hours fracture as the analysis object. A check 1 The current process conditions Camshaft steel 18Cr2Ni4WA, cut by the bar from the process flow lines are as follows: Machining → overall carburization (910 ± 10 ℃, depth 1.63 ~ 1.96mm) → high temperature tempering (650 ± 10 ° C, ≥5 hours) → Straightening → Stress relief anneal (220 ± 20 ° C, ≥2 hours) → machined taper →