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，超声波金属焊接（USMW）已被证明是连接电子组件的合适技术。电气系统的复杂性越来越复杂，已经促使该行业广泛地部署了这项技术。但是，尽管应用广泛应用，但USMW流程仍然遭受质量波动的影响。波动在很大程度上起源于缺乏深刻的科学知识和对工具与加入部分之间相互依赖性的理解，而这些部分在过去的经验研究中在很大程度上被忽略了。对申请人的最新研究表明，由工具和信徒组成的整个机械系统变化的振荡行为的测量可以提供有关键界内热机械过程的详细状态和序列的宝贵信息。特别是（结构性的）声学排放似乎可以对复杂过程进行全面的分析，因此可能使用基于科学的模型为其描述提供了有充分的基础。因此，在本项目中计划了将声学发射作为USMW流程的分析工具的适用性的基本研究。为此，将开发并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附着者的预性和后处理筛选，并应用于捕获必要的测量数据。基于最先进的知识以及对所获得的特征结构传播和空气传播的声学排放的分析，将针对整个联接过程描述潜在的物理过程。与关节的特性相关的特征变量将源自声发射，并允许在未来的项目中预测焊接质量。通过分析焊接过程中定义的误差案例在焊接过程中对USMW工艺有更深入的了解。经过验证后，该项目的结果将引入潜在的，以应用现场可测量的监视标准，以实时控制USMW流程。