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随着排放法规的逐步加严,发动机排气温度也逐渐升高,某发动机排气歧管采用了高镍奥氏体球铁,试验后发现难拆卸问题。通过对失效件的检测分析发现靠近排气歧管出口的两缸法兰相互收缩较为严重,正对排气歧管出口的进气法兰还发生了扭转变形。通过CAE分析方法确认了排气歧管进气法兰收缩问题是由于材料高温蠕变导致的。通过试验验证的方法,确认了排气歧管结构优化方案能减小进气法兰收缩变形,能解决难拆卸问题。
With the gradual tightening of emission regulations, engine exhaust temperature is also gradually increased, an engine exhaust manifold using high-nickel austenitic ductile iron, the test found difficult to dismantle the problem. Through the inspection and analysis of the failed parts, it is found that the two-cylinder flange close to the outlet of the exhaust manifold is more contracted each other, and the intake flange at the outlet of the exhaust manifold also undergoes torsional deformation. It was confirmed by the CAE analysis that the problem of shrinkage of the exhaust manifold intake flange was caused by creep of the material at high temperature. Through the experimental verification method, it is confirmed that the exhaust manifold structure optimization scheme can reduce the shrinkage deformation of the intake flange and can solve the problem of difficult disassembly.