| Hub deformation and performance control has become a major problem in the manufacturing processing of aluminum alloy hubs,and the heat treatment process has a great influence on the deformation control of wheel blanks.The non-uniform characteristics of complex curved surfaces of aluminum alloy hubs,heat treatment process system and equipment restrictions make the wheel hub prone to non-uniform deformation,which in turn affects mechanical processing.Therefore,the research and design of process regulations suitable for quenching and cooling of aluminum alloy hubs and the realization of integrated control of solid solution heat treatment of cast aluminum alloy hubs are urgent problems for aluminum alloy wheel manufacturers at this stage.The paper takes the aluminum alloy hubs made of A356 as the research object,and uses ANSYS finite element analysis software to simulate and verify it experimentally,and the specific work is as follows:Firstly,using JMat Pro software,the thermophysical parameters and mechanical properties of A356 material are obtained according to the simulation calculation of each element content of A356 material,the thermal-flow coupling model of the dynamic quenching process of the hub is established,the numerical simulation of the immersion quenching process of the aluminum alloy hub is carried out,the change process of the surrounding flow field and the distribution law of the hub temperature field during the dynamic quenching process of the hub are obtained,and the temperature change,deformation field and stress field of the characteristic position are analyzed during the hub quenching process.At the same time,the influence of different quenching water temperatures on various physics in the quenching process of the hub is simulated,and the reasonable quenching temperature is determined.Secondly,the heat treatment process of graded quenching of the hub is proposed,that is,the outer rim area of the hub is sprayed and then immersed and quenched as a whole.In addition,a thermal-fluid-structure coupling model of dynamic quenching process of wheel hub classification was established,and the numerical simulation of aluminum alloy wheel hub grading quenching process was carried out.After comparative analysis,it is concluded that graded quenching is beneficial to improve the problem of uneven axial deformation of the hub,and the influence of spray treatment on the temperature field,deformation field and stress field distribution of the hub is discussed.At the same time,the spray height,spray angle,spray speed and spray time were changed,and the influence of different spraying process parameters on the hub deformation field and stress field was determined.Finally,by using the multi-functional graded quenching experimental platform and deformation detection platform of aluminum alloy hub,the temperature field and deformation field of direct immersion quenching and graded quenching of the hub were tested,and the metallographic testing and mechanical properties of the heat-treated hub were carried out,and the results showed that the graded quenching could optimize the quenching deformation and the performance met the actual requirements.The multi-functional graded quenching experimental platform,deformation detection platform and dynamic quenching simulation of the wheel hub provide an important basis for the formulation of the heat treatment process of aluminum alloy hubs. |
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