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Process analysis of ultrasonic metal welding by acoustic emission

声发射超声波金属焊接工艺分析

基本信息

批准号：
395129909
负责人：
Professor Dr.-Ing. Uwe Reisgen
金额：
--
依托单位：
Institut für Schweißtechnik und Fügetechnik (ISF)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/395129909?language=en
关键词：
Process analysis ultrasonic metal welding

项目摘要

In recent years, ultrasonic metal welding (USMW) has proven to be a suitable technique for joining electronic components. The increasing complexity of electrical systems already prompted the industry to widely deploy this technology. However, despite its widespread application, the USMW process still suffers from quality fluctuations. The fluctuations largely originate in the lack of profound scientific knowledge and understanding of the interdependency between the tools and joining parts, which was largely ignored in past empirical studies. Recent investigations of the applicants have indicated that measurements of the changing oscillation behavior of the entire mechanical system, comprised of the tools and the adherents, can provide valuable information about the detailed state and sequence of the thermo-mechanical process within the bond interface. The (structural) acoustic emissions in particular appear to allow for a comprehensive analysis of the complex process and thus might provide a well-founded base for its description using a scientifically based model.Therefore, a fundamental investigation of the applicability of using acoustic emission as an analysis tool for the USMW process is planned in this project. For this purpose, an extensive data acquisition concept, encompassing internal and external sensor technology as well as the pre- and post-process screening of the adherents, will be developed and applied for capturing the necessary measurement data. Based on the state-of-the-art knowledge and the analysis of the acquired characteristic structure-borne and airborne acoustic emissions, the underlying physical processes will be described for the entire joining procedure.Characteristic variables which correlate with the properties of the joint, will be derived from acoustic emission and allow the prediction of the weld quality in future projects. By analysis of defined error cases on thermo-mechanical mechanism during welding a more profound understanding of the USMW process should be achieved. Once validated, the results of this project will introduce the prospective to apply on-site measurable monitoring criteria for controlling the USMW process in real-time.

近年来，超声金属焊接（USMW）已被证明是一种适合连接电子元件的技术。电气系统的日益复杂已经促使该行业广泛部署这种技术。然而，尽管USMW工艺得到了广泛的应用，但其质量仍存在波动。这种波动很大程度上是由于缺乏深刻的科学知识和对工具与连接部件之间相互依赖关系的理解，而这在过去的实证研究中很大程度上被忽视了。最近对申请者的调查表明，测量由工具和附体组成的整个机械系统的振荡行为变化，可以提供有关键界面内热机械过程的详细状态和顺序的有价值的信息。特别是（结构）声发射似乎允许对复杂过程进行全面分析，因此可能为使用基于科学的模型进行描述提供良好的基础。因此，本项目计划对声发射作为USMW过程分析工具的适用性进行基础研究。为此目的，将开发和应用广泛的数据采集概念，包括内部和外部传感器技术以及对附体的预处理和后处理筛选，以捕获必要的测量数据。基于最先进的知识和对所获得的特征结构声发射和机载声发射的分析，将描述整个连接过程的潜在物理过程。与接头性能相关的特征变量将从声发射中得到，并允许在未来的工程中预测焊接质量。通过对已定义的焊接热-力学机理误差案例的分析，对超细焊接工艺有了更深刻的认识。一旦验证，该项目的结果将引入应用现场可测量的监测标准来实时控制USMW过程的前景。