Methods for the design of formed metal parts with printed sensors

带印刷传感器的成型金属零件的设计方法

基本信息

批准号：
279559208
负责人：
Professor Dr.-Ing. Peter Groche
金额：
--
依托单位：
Institut für Produktionstechnik und Umformmaschinen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/279559208?language=en
关键词：
Methods design formed metal parts

项目摘要

This research proposal aims for plastic forming of printed strain gauges to design innovative products. For this purpose strain gauges are printed on semi-finished metal parts which are formed afterwards. The goal is the production of formed metal products with printed strain gauges that are able to measure elastic strains after the forming process. The investigations are performed for a roll forming application. So far, no strategies for the anticipation of the change in conductivity of the printed strain gauges caused by the forming process are available. Furthermore, no approaches are known which permit temperature compensation of the printed strain gauges after the forming process and take into account their geometric distortion. These gaps will be filled by the proposed project. The goal of the project is the development of methods and guidelines for the design of formed metal parts with printed sensors. The k-factor, which is an indicator for the sensitivity of the strain gauges, depends on geometrical (e.g. cross-sectional area) and material-specific parameters (e.g. conductivity). They can be influenced by the forming process and the environmental conditions. In particular, the influences of the following parameters on the k-factor have to be investigated and an analytical relation has to be derived: temperature, surface texture of the sheet, surface preparation, degree of deformation, strain rate and stress state. The screen printing inks are evaluated in terms of reproducibility of the printed image, the ductility, the adhesion and the scratch resistance. In addition, a test device is designed in which printed strain gauges samples are characterized at low strains. In addition, a characterization after single and multi-axis plastic deformation is performed to determine the variation of the k-factor as function of the above mentioned parameters. Thus an analytical relationship and a guideline for the design of formed metal parts with printed sensors can be derived. The findings are used to design a demonstrator which is produced by roll forming.

该研究建议旨在塑料印刷应变量规以设计创新产品。为此，将应变量规打印在以后形成的半成立金属零件上。目的是生产具有印刷应变测量表的形成金属产品，该产品能够在成型过程后测量弹性应变。进行调查是针对滚动申请进行的。到目前为止，尚无预期由成型过程引起的印刷应变计电导率变化的策略。此外，尚无方法知道在成型过程后允许打印应变量规的温度补偿，并考虑其几何变形。这些差距将由拟议的项目填补。该项目的目的是开发具有印刷传感器的形成金属零件的方法和准则。 K因子是应变测量值灵敏度的指标，取决于几何（例如横截面区域）和材料特异性参数（例如电导率）。它们可能会受到形成过程和环境条件的影响。特别是，必须研究以下参数对K因子的影响，并且必须得出分析关系：温度，表面纹理，表面制备，变形程度，应变速率和应力状态。丝网印刷油墨是根据印刷图像，延展性，粘附和刮擦电阻的可重复性评估的。此外，设计了一个测试设备，其中打印的应变量规样品在低应变下进行表征。此外，执行单轴和多轴塑性变形后的表征，以确定K因子作为上述参数的函数的变化。因此，可以得出分析关系和设计具有印刷传感器的金属零件的指南。这些发现用于设计通过滚动形成产生的演示器。