Research On Deformation In End Milling Of Aerospace Thin-walled Structure Part

Thin-walled parts is composed by various thin board (shell) and the tendons of strengthening as a lightweight structural parts.It has a advantage of light weight, high strengthly and aesthetically. As well as that, the structure of thin-walled has a widespread application and it was commonly used by aerospace products. Because the structure has a request of lightweight parts, the large number of aluminum alloy and titanium alloy are commonly used as a low density of the material. Thin-walled structure have a lot of problems in the manufacturing process,such as deformation,buckling and vibration caused by cutting force, clamping force, because of its relatively low stiffness, poor processing technology. It is extremely difficult in the process of manufacturing. Deformation in machining had an important role in the aviation manufacturing technology, and it has seriously impeded the development of the aviation industry. Therefore, we are studying the way of reduced deformation in machining, which has a great value of theoretical and engineering applications. The way of studying was composed by theoretical modeling, software analysis and experimental study because it's complexity of the issue. The study will include the following main aspects:(1)It have an analysis of the deformation mechanism by thin-walled parts and the way of reducing deformation in cutting process, and the commonly measures of reducing deformation were summarized. As the milling force have an important influence to the deformation of thin-walled parts, the paper has summarized the sources of milling forces and the factors of milling forces. In view of the milling characteristics of the thin-walled parts, the paper has a reasonable choice of thin-wall mechanical model.(2)The paper has summarized the characteristics of the structure of thin-walled parts and divided into two categories: parts as wall uniform-thickness and variable wall thickness parts. The variable thickness parts can be considered to be composed by structures such as uniform-thickness, then the paper have studying the deformation of parts with uniform-thickness wall structure, which is typical.(3) The model taking the lowest time and cost as the objection have been established.The conception of optimization cutting parameters and modified tool paths as step-by-step is proposed. The parts have been divided into different components based on the shape of parts and the processing requirements, and then the processing parameters of every component have been optimized.And then the tool path has been modified based on the analysis of the deformation in cutting, the deformation value has been reduced in cutting processing purposes.as a result. (4) The NC program after modified tool path has been generated with the machining simulation. In the CNC Machining Center, the thin-walled parts have been manufactured.And the practical example shows that the way of modified tool path is feasible.