旋转摩擦焊阻抗匹配特性研究

项目名称： 旋转摩擦焊阻抗匹配特性研究

项目编号： No.51475376

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 李京龙

作者单位： 西北工业大学

项目金额： 84万元

中文摘要： 旋转摩擦焊在民用工业的广泛应用，充分显示其作为固相焊接所具备的高品质、高效与节能，但一直未能很好地应用到航空航天等高技术领域，因为缺少可信的工艺设计准则，从而导致规范选取的随意性和分散性。工艺的设计准则（和规范带），缘于判据、特性等工艺理论的支撑。摩擦焊接头成形所需要的热能，是界面摩擦阻抗做功耗散为热的结果。因此，摩擦阻抗特性研究，即摩擦阻抗分布、演变表征，以及最佳阻抗匹配判据等，就成为立项要解决的关键科学问题。本研究以旋转摩擦焊第一阶段为主要研究对象，以实验研究为主要手段，以 V 曲线研究为切入点，首先获得V 曲线极值点判据；进而深入研究界面温度场、塑性环演变；结合界面摩擦阻抗演变研究，表征并充分理解摩擦焊接头的热流模式；获得摩擦界面产热模型及最佳阻抗匹配判据的理论解析。研究成果将丰富摩擦焊制造供工艺理论基础，并为接头可靠性研究提供理论支撑。

中文关键词： 固相焊接；摩擦焊；焊接热源；规范带；阻抗匹配

英文摘要： Rotary friction welding, being a solid state welding method, has been widely applied in civil engineering that shows the high quality of the joint, high efficiency and energy saving of the process. However, rotary friction welding is not well applied in aerospace industry owing to the lack of rules for process design (and reliable operation window). Thus arbitrary selection occurs on the operation parameters. Therefore, there is less confidence for the design department to choose such process for the joint manufacture. The rules for process design or operation window is supported by the process theory such as 'criterion' and 'characterization'. In friction welding, the requested heat for the joint formation is resulted from the 'friction impedance' to do work that releases heat. Thus, the key scientific issues are unveiled as the characterization of the friction impedance, i.e., characterization of friction impedance on distribution along friction interface and its evolution, and impedance matching criterion. This project focuses on the first stage of rotary friction welding process with experimental study as the main research methods. The work starts from the 'V-curve' study to locate the valley point as the 'criterion'. Thereafter, there comes into study of interfacial temperature field and corona bond evolution of the joint. By the combination study on the impedance evolution of friction, the 'heat pattern' of the joint is characterized and understood comprehensively. The theoretical models are then constructed for the heat liberation and optimal impedance matching criterion. The research will enrich the fundamentals of process theory on rotary friction welding and support the further study on joint reliability.

英文关键词： Solid state welding;Friction welding;Welding heat source;Operation window;Impedance matching