Method for optimizing complicated member gas-quenching system based on CFD software

Abstract

The invention discloses a method for optimizing complicated member gas-quenching system based on CFD software. The method comprises the steps that a member gas-quenching system solid computation domain and a fluid computation domain geometric model are established; grid partition is conducted on a geometric model; the geometric model is imported to the CFD software, and a temperature field is set and solved; the steps are repeated by modifying relevant parameters to perform multiple times of numerical simulation; temperature field data corresponding to the multiple times of numerical simulation are organized, a database is established, the minimum internal temperature difference of a member is regarded as a target, automatic optimizing is performed through the database, and an optimum process parameter combination is selected to ensure the uniformity of the internal temperature of the member. The temperature field inside the member is predicted under various gas-quenching working conditions by adopting a computer analog technology, the minimum internal temperature difference of the member is regarded as the optimizing target so as to ensure uniformity of the internal temperature of the member, and a rapid way is provided for optimization of the complicated member gas-quenching system.

Description

technical field [0001] The invention relates to a method for optimizing a heat treatment process of a complex component, in particular to a method for optimizing a gas quenching system of a complex component based on CFD software. Background technique [0002] Quenching is an important process in metal processing. By adjusting and controlling the parameters of the cooling medium to control the temperature field, tissue field, stress field and strain field of the workpiece, the workpiece can meet the corresponding organizational requirements and performance, and the uneven field can be reduced as much as possible. The resulting residual stress and residual strain to improve the quality of metal workpieces. During the quenching process, due to uneven cooling, the temperature distribution of the metal workpiece is uneven, resulting in uneven structural transformation, thermal stress and structural stress, affecting the mechanical properties of the workpiece, reducing the servic...

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Problems solved by technology

[0003] During the quenching process, the heat transfer between the workpiece and the cooling medium is complicated, which is affected by various factors such as the shape of the workpiece, surface temperature, flow field, temperature and flow rate of the cooling medium, and is difficult to quantitatively analyze

At present, the cooling rate between the cooling medium and the workpiece is mostly qualitative analysis or experimental measurement, which cannot meet the precise and efficient control requirements

[0004] The quenching process is a complex process coupled with multiple fields, and it is very difficult to solve it theoretically, and it is even more impossible to solve it directly for complex components; related experiments involve high-temperature operations and online measurements, and parameter measurement is also quite difficult; in order to understand the effects of different cooling schemes, it is necessary to Carrying out a large number of experiments will waste too much cost; at the same time, because the comprehensive heat transfer coefficient in the cooling process of components is affected by parameters such as the surface characteristics of components, temperature and flow velocity distribution of cooling medium, the universality of the experimental results is poor

Based on the above reasons, the current quenching process control is mostly qualitative analysis and empirical adjustment, the theory is weak, and the technology is backward.

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