線材折彎設備設計及線材折彎回彈特性研究
[Abstract]:With the development of equipment manufacturing industry, the requirements of shape complexity, product precision and processing speed of metal wire bending parts become more and more high. Traditional manual or semi-automatic bending methods are difficult to meet the demand. It is necessary to develop automatic wire bending equipment. In the process of unloading, the springback of wire is inevitable, which seriously affects the forming quality of the product. Therefore, it is of great practical significance to study the effect of various process parameters and material parameters on the springback of wire rod, to minimize the springback and improve the forming quality as much as possible. In this paper, the bending characteristics of wire bending equipment and wire bending are studied. The specific contents are as follows: firstly, according to the demand analysis of wire bending equipment, the project design of wire bending equipment is carried out, and the material storage module is designed. The four main function modules of feeding straightening module, feeding module and linkage bending module are designed one by one. Finally, the overall structure design of wire bending equipment is realized, which realizes better flexibility and higher integration degree in structure. Continuous machining is realized and processing efficiency is improved. Secondly, the springback phenomenon of wire bending is studied. The analytical method and numerical method are used to analyze and calculate the two kinds of bending angles, and the theoretical results of springback angle are compared with the results of numerical simulation. It has good consistency and proves the correctness and reliability of the mathematical model. In addition, the internal residual stress of wire during unloading springback is analyzed. Thirdly, the relative bending radius, bending angle, relative bending moment, length of bending force arm are studied by using orthogonal test method, with the springback angle and springback radius of wire rod as the index, the relative bending radius, the bending angle, the relative bending moment and the bending force arm length are studied. The influence of six factors, hardening index and strength coefficient, on the springback of wire is obtained, and the order of sensitivity of wire to springback is obtained. Based on matrix analysis, the best parameter combination of wire bending is obtained, and the correctness of the best parameter combination is verified. Finally, based on the programming software of Visual Basic 6.0, a springback prediction system of wire bending is developed. The user chooses or sets the parameters consistent with the actual working conditions, and the system automatically calls the ABAQUS finite element analysis software to carry on the numerical simulation after submitting. Direct display of the predicted springback angle and output of post-processing files provide a new approach to the resolution of the springback problem and have an incomparable efficiency advantage compared with the traditional method.
【學位授予單位】:江蘇科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG305
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