Study On The Thermal Deformation Of Aluminium7050-T7451Aeronautical Monolithic Components

Monolithic components are being widely used in the field of aviation due to their lower height, higher structural efficiency and higher working reliability compared with traditional riveted parts. However, the Monolithic components have large overall dimensions up to several meters or tens meters, and complex structure, demanding high precise shape form. The surrounding contours also have coordinating relations with other parts when assembled. owing to the large dimension, complicated structure, and long process(ing)cycle, monolithic components deformation during machining is almost inevitable, such us bending, distortion or their combination.Based on analysis of thermal deformation due to ambient temperature for A17050-T7451monolithic parts,both the theoretical analysis and experimental research to predict the structure deformation due to thermal expansion is carried out for A17050-T7451aluminum alloy pre-stretching plate frame monolithic components in the CNC machining process due to thermal deformation caused by the ambient temperature to figurie out the law of thermal deformation, providing a reference for the parts in CNC machining thermal deformation compensation.According to the CTE on the thermal deformation calculation accuracy, it is pointed out that CTE is one of the main parameters to calculate the thermal expansion deformation. For A17050-T7451pre-stretch plate alloy, the CTE of three-dimensional directions are different because of the many factors such as pre-stretch processing. The law of CTE of the aluminum alloy in different directions with temperature change is got by experimental measurements of thermal expansion data and the experimental results.The combination of simulation study and theory analysis is adopted to find the thermal deformation law of Monolithic components. Cross-sections of different shape is Separated from the complex structural components for the theoretical calculation and simulation of the thermal expansion deformation, and the thermal stress caused by thermal expansion process. The computational model of Cross-sections of different shape thermal deformation and the FEM analysis model are established.With different cross-section of thermal expansion deformation characteristics, the thermal deformation of a specific monolithic component is analyzed by FEM.Taking into account the impact of clamping, temperature, the law of thermal deformation characteristics of such parts, and thermal stress caused by thermal expansion and the impact on NC machining accuracy is analyzed.