Research On The Precisioncontrol And Compensation Method Of The Thin Wall Parts

The tank thin-wall parts is a kind of typical large thin wall parts, which is mainly used in the aerospace field. The traditional processing technology is uses chemical milling or flat plate milling to form a tube, but the main disadvantage of this method is that the natural environment pollution is more serious and the product is low. In recent years, a new type of green processing technology is proposed, which is used the whole milling instead the traditional machining method to remove the material, but because of its low rigidity, it is easy to produce deformation. So it is very important to study the deformation analysis, the deformation control method and the precision control of this kind of parts.In this paper, a high precision milling force model is set up for this kind of parts. The machining parameters and deformation error compensation are realized by using the finite element simulation and machining measurement. The machining accuracy of the part is controlled by two aspects, In order to achieve the purpose of low distortion, low tremor, high precision and high efficiency of this kind of parts. Specific research contents are as follows:(1) The cutting force model is established, which considers the influence of cutting tools, cutting speed, feed rate, cutting depth, cutting width and so on. The experiment of cutting process of aluminum alloy 2219 material is designed, and the shear force coefficient is determined, which provides theoretical basis for finite element analysis and deformation control method.(2) The deformation analysis model is established based on the finite element model, and the load of the finite element model is applied to the finite element model.(3) A method to optimize the deformation of cutting parameters is put forward, and the method of increasing the rigidity of the parts in the process of the parts is proposed to reduce the deformation and vibration of the machining process.(4) Based on local tolerance, a method of optimization of the partition region is proposed, and the deformation coupling coefficient is determined.