數控漸進成形反彈補償成形軌跡生成
[Abstract]:As a kind of flexible machining technology, numerical control incremental forming technology has been developed gradually because of its rapid manufacturing of complex sheet metal parts. At the same time, there are some problems, such as forming precision. Rebound is a key problem that restricts the forming accuracy of sheet metal. The traditional method to solve the rebound is experimental method, which is compensated according to the amount of rebound measured. However, because of the complexity of many factors that cause the rebound, The primary compensation is often difficult to achieve the precision requirement, but many experiments waste time and material resources. Therefore, this paper presents a method for predicting the rebound quantity and generating the compensation forming trajectory based on the digital analog explicit / implicit finite element analysis. And develop a special trajectory generation software system. In this paper, the rebound of sheet metal is divided into the rebound in the forming process and the rebound after unloading. First, the first forming track is generated from the part to be formed, and the rebound during sheet metal forming is simulated by explicit finite element analysis with the tool location of the track. The rebound after unloading is simulated by implicit finite element analysis based on the results of explicit analysis. Secondly, the coordinates of all nodes of the plate model are derived from the results of implicit finite element analysis, and then the surface of the plate after the rebound simulation is reconstructed, and the surface reconstruction model is compared with the theoretical model, and the deviation value of the normal rebound is calculated. Thirdly, according to the deviation value of normal rebound, the compensation surface and the forming trajectory are generated by the theoretical model with non-equidistant bias, and the finite element analysis is carried out again by using the trajectory point, and the above process is repeated until the precision requirement of the user is met. Fourthly, a compensation iterative algorithm is proposed for different compensation distances in the process of multiple compensation, and a smoothing algorithm is proposed for the problem of non-smooth compensation surface in the process of multiple compensation. At the same time, a software system based on VC 6.0 / MFC and OPenGL visualization platform is developed, which can realize the functions of contour track generation, surface reconstruction, rebound deviation calculation, compensation surface forming trajectory generation and so on. Finally, the conclusion is drawn from the finite element analysis that the accuracy of forming can be satisfied with the third compensation. Then the forming trajectory of the theoretical model and the compensation model after the cubic compensation are tested. The experimental results show that the proposed method is feasible to predict and compensate the forming trajectory based on the digital analog explicit / implicit finite element analysis, and can improve the forming accuracy of sheet metal parts.
【學位授予單位】:沈陽航空航天大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG306
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