Numerical simulation research and scientific problems of surface strengthening of automotive helical gears

In the field of scientific research and engineering technology, numerical simulation is a basic research method that pays equal attention to theoretical analysis and experimental testing. The development of numerical simulation technology provides a platform for the optimal design of automotive helical gear surface strengthening technology.

In the research field of mechanical numerical simulation of shot peening strengthening process of automobile helical gear, scholars at home and abroad have done a lot of research and application, including the prediction of shot peening residual stress by using one-dimensional analytical method of elastic-plastic model, the simulation of two-dimensional shot peening process considering shot peening strength factors, and the numerical simulation of shot peening on microcrack propagation and surface morphology of automobile helical gear by using finite element three-dimensional model [51]. However, the research on nano scale mechanical properties of shot peening strengthened materials, the quantitative relationship between shot peening parameters and the improvement of automobile helical gear performance, and the simulation of multiple continuous impacts of bullets with different materials and diameters still need to be further studied.

Based on the optimization of surface structure to improve the friction, wear and lubrication performance of automobile helical gear pair surface, the research in this field has been a hot spot in the academic and engineering circles for a long time. The influence of different machining and surface strengthening treatment on the geometric morphology and roughness of tooth surface is directly related to the lubrication state of automobile helical gear.

Therefore, it is necessary to study the mixed elastohydrodynamic lubrication characteristics of different tooth surface morphology of automotive helical gear, solve the elastic deformation, surface temperature rise and contact flash temperature of tooth surface, analyze the pyrolysis of different coating surface lubrication and the quantitative law of surface morphology and friction and wear of automotive helical gear, and study the failure mechanism of tooth surface and optimize the strength design of automotive helical gear. Due to the rich internal and external excitation and nonlinear factors of automotive helical gear transmission and the complex and changeable working environment, its dynamic analysis is very complex. Factors such as manufacturing, processing, error, wear, lubrication and operating environment will lead to the uncertainty of excitation parameters of automotive helical gear system. Multiple uncertain factors exist at the same time, resulting in the high dimensionality of automotive helical gear system problems, This makes it difficult to study the failure mechanism and strengthening mechanism of automotive helical gears. Therefore, to study the dynamics of automotive helical gear system, it is necessary to consider the uncertainty optimization design method and sensitivity analysis method.

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