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Jia Z.,Powertrain Institute | Zeng Q.,Powertrain Institute | Liu B.,Powertrain Institute | Hu T.,Powertrain Institute | Zhan Z.,Powertrain Institute
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys

With the help of CAE technology, through analyzing fatigue strength and creep strength of materials and casting process, effects of working stress, material service life and casting defects on the crack in the cylinder head crack were investigated. Meanwhile, effects of heat treatment, raw materials composition and modification treatment on the crack were analyzed, which provided a reference to eliminate and prevent crack in the cylinder head. The quantitative relationship between secondary dendrite arm spacing (DAS2) and solidification cooling rate with mechanical properties of the cylinder head was described. DAS2 can be achieved quickly by CAE and verified accurately by tested data. The simulated results are well agreement with the experimental ones. Source

Guan L.,Powertrain Institute | Zeng Q.-Q.,Powertrain Institute | Liu B.,Powertrain Institute | Hu T.-G.,Powertrain Institute | Zhan Z.-S.,Powertrain Institute
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)

Simulating cylinder head machining can effectively reduce the deformation bearing the bolt pre-tightening force of cylinder liner, reduce oil consumption and minimize air leak caused by the deformation of cylinder liner. For simulating cylinder head machining, traditional simulated result cannot be directly compared with the experimental data, which brings certain difficulty to evaluate the deformation of cylinder liner. Based on simulating cylinder head machining and assembly process combining with inverse Fourier transform, this paper explore a simulation and test comparison method. Comparison of simulation results and test data shows that the method is accurately and reliably. This method can forecast and evaluate the deformation of simulating cylinder head machining and analyze the deformation of cylinder head traditional machining. The method has a good reference to the analysis of cylinder liner deformation. This method was also used to analyze cylinder liner in large deformation and proposed effective approach for large deformation. Source

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